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Hi-performance Regulator IC Series for PCs Main Power Supply ICs for Note PC (Linear Regulator Integrated) BD9528MUV No.10030EAT26 Description BD9528MUV is a 2ch switching regulator controller with high output current which can achieve low output voltage (1.0V 5.5V) from a wide input voltage range (5.5V28V). High efficiency for the switching regulator can be realized by utilizing an external N-MOSFET power transistor. A new technology called H3RegTM(High speed, High efficiency, High performance) is a Rohm proprietary control method to realize ultra high transient response against load change. SLLM (Simple Light Load Mode) technology is also integrated to improve efficiency in light load mode, providing high efficiency over a wide load range. For protection and ease of use, 2ch LDO (5V/100mA, 3.3V/100mA), the soft start function, variable frequency function, short circuit protection function with timer latch, over voltage protection, and Power good function are all built in. This switching regulator is specially designed for Main Power Supply of laptop PC. Features 1) 2ch H3REGTM DC/DC Converter controller 2) Adjustable Simple Light Load Mode (SLLM), Quiet Light Load Mode (QLLM) and Forced continuous Mode 3) Thermal Shut Down (TSD), Under Voltage LockOut (UVLO), Over Current Protection (OCP), Over Voltage Protection (OVP), Short circuit protection with 0.75ms timer-latch (SCP) 4) Soft start function to minimize rush current during startup 5) Switching Frequency Variable (f=200kHz500kHz) 6) Built-in Power good circuit 7) Built-in 2ch Linear regulator (5V/100mA,3.3V/100mA) 8) Built in reference voltage(0.7V) 9) VQFN032V5050 package 10) Built-in BOOT-Di 11) Built-in output discharge Applications Laptop PC, Desktop PC, LCD-TV, Digital Components www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 1/33 2010.03 - Rev.A BD9528MUV Absolute maximum ratings (Ta=25) Parameter Symbol VIN, CTL,SW1,SW2 EN1, EN2, PGOOD1, PGOOD2 Vo1, Vo2, MCTL1, MCTL2 FS1, FS2, FB1, FB2, ILIM1, ILIM2, SS1, SS2, LG1, LG2, REF,REG2 BOOT1, BOOT2 BOOT1-SW1, BOOT2-SW2, HG1-SW1, HG2-SW2 HG1 HG2 PGND1, PGND2 Pd1 Pd2 Pd3 Pd4 Topr Tstg Tjmax Limits 30 *1*2 6 *1*2 REG1+0.3 *1 35 *1*2 7 *1*2 BOOT1+0.3 *1*2 BOOT2+0.3 *1*2 AGND0.3 *1*2 0.38 *3 0.88 *4 3.26 *5 6 4.56 * -20+100 -55+150 +150 Technical Note Unit V V V V V V V V W W W W Terminal Voltage Power Dissipation1 Power Dissipation2 Power Dissipation3 Power Dissipation4 Operating temperature Range Storage temperature Range Junction Temperature *1 Do not however exceed Pd. *2 Instantaneous surge voltage, back electromotive force and voltage under less than 10% duty cycle. *3 Reduced by 3.0mW for each increase in Ta of 1 over 25 (when don't mounted on a heat radiation board ) *4 Reduced by 7.0mW for increase in Ta of 1 over 25. (when mounted on a board 74.2mmx74.2mmx1.6mm Glass-epoxy PCB which has 1 layer. (Copper foil area : 20.2mm2) *5 Reduced by 26.1mW for increase in Ta of 1 over 25. (when mounted on a board 74.2mmx74.2mmx1.6mm Glass-epoxy PCB which has 4 layers. (1st and 4th copper foil area : 20.2mm2, 2nd and 3rd copper foil area : 5505mm2) *6 Reduced by 36.5mW for increase in Ta of 1 over 25. (when mounted on a board 74.2mmx74.2mmx1.6mm Glass-epoxy PCB which has 4 layers. (All copper foil area : 5505mm2) Operating conditions(Ta=25) Parameter Symbol VIN CTL EN1, EN2, MCTL1, MCTL2 BOOT1, BOOT2 SW1, SW2 BOOT1-SW1, BOOT2-SW2, HG1-SW1, HG2-SW2 Vo1, Vo2, PGOOD1, PGOOD2 TONmin MIN. 5.5 -0.3 -0.3 4.5 -0.3 -0.3 -0.3 MAX. 28 28 5.5 33 28 5.5 5.5 150 Unit V V V V V V V nsec Terminal Voltage MIN ON TIME This product should not be used in a radioactive environment. www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 2/33 2010.03 - Rev.A BD9528MUV Electrical characteristics (unless otherwise noted, Ta=25 VIN=12V, CTL=OPEN, EN1=EN2=5V, FS1=FS2=51k) Standard Value Parameter VIN standby current VIN bias current VIN shut down mode current CTL Low Voltage CTL High Voltage CTL bias current EN Low Voltage EN High Voltage EN bias current [5V linear regulator](VIN) REG1 output voltage Maximum current Line Regulation Load Regulation [3.3V linear regulator] REG2 output voltage Maximum current Line Regulation Load Regulation [5V linear regulator](Vo1) Input threshold voltage Input delay time Switch resistance [Under Voltage lock out block] REG1 threshold voltage Hysteresis voltage [Output voltage sense block] Feedback voltage1 FB1 bias current Output discharge resistance1 Feedback voltage2 FB2 bias current Output discharge resistance2 VFB1 IFB1 RDISOUT1 VFB2 IFB2 RDISOUT2 0.693 50 0.693 50 0.700 0 100 0.700 0 100 0.707 1 200 0.707 1 200 V A V A REG1_UVLO dV_UVLO 3.9 50 4.2 100 4.5 200 V mV REG1th TREG1 RREG1 4.1 1.5 4.4 3.0 1.0 4.7 6.0 3.0 V ms VREG2 IREG2 Reg.l2 Reg.L2 3.27 100 3.30 3.33 20 30 V mA mV mV VREG1 IREG1 Reg.l1 Reg.L1 4.90 100 5.00 90 30 5.10 180 50 V mA mV mV Symbol MIN. ISTB IIN ISHD VCTLL VCTLH ICTL VENL VENH IEN 70 60 6 -0.3 2.3 -18 -0.3 2.3 TYP. 150 130 12 -12 3 MAX. 250 230 18 0.8 28 -6 0.8 5.5 6 A A A V V A V V A Unit Technical Note Condition CTL=5V, EN1=EN2=0V Vo1=5V CTL=0V CTL=0V EN=3V IREG1=1mA IREG2=0mA VIN=5.5 to 25V IREG1=0 to 30mA IREG2=1mA IREG1=0mA VIN=5.5 to 25V IREG2=0 to 30mA Vo1: Sweep up REG1: Sweep up REG1, Sweep down FB1=REF FB2=REF www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 3/33 2010.03 - Rev.A BD9528MUV Electrical characteristics - Continued (unless otherwise noted, Ta=25 VIN=12V, CTL=OPEN, EN1=EN2=5V, FS1=FS2=51k) Standard Value Parameter [H3REG block] Ontime1 Ontime2 Maximum On time 1 Maximum On time 2 Minimum Off time [FET driver block] HG higher side ON resistor HG lower side ON resistor LG higher side ON resistor LG lower side ON resistor [Over voltage protection block] OVP threshold voltage OVP Hysteresis [Short circuit protection block] SCP threshold voltage Delay time [Current limit protection block] Offset voltage [Power good block] Power good low threshold Power good low voltage Delay time Power good leakage current [Soft start block] Charge current Standby voltage [Mode control block] MCTL Low voltage MCTL High voltage MCTL bias current VMCTL_L VMCTL_H IMCTL -0.3 2.3 8 16 0.3 REG1 +0.3 24 V V A ISS VSS_STB 1.5 2.3 3.1 50 A mV VPGTHL VPGL TPGOOD ILEAKPG 0.525 (-25%) 0.4 -2 0.595 (-15%) 0.1 0.75 0 0.665 (-5%) 0.2 1.5 2 V V ms A dVSMAX 80 100 120 mV VSCP TSCP 0.42 (-40%) 0.4 0.49 (-30%) 0.75 0.56 (-20%) 1.5 V ms VOVP dV_OVP 0.77 (+10%) 50 0.84 (+20%) 150 0.91 (+30%) 300 V mV HGHON HGLON LGHON LGLON 3.0 2.0 2.0 0.5 6.0 4.0 4.0 1.0 TON1 TON2 TONMAX1 TONMAX2 TOFFMIN 0.760 0.470 2.5 1.65 0.910 0.620 5 3.3 0.2 1.060 0.770 10 6.6 0.4 s s s s s Symbol MIN. TYP. MAX. Unit Technical Note Condition Vo1=5V Vo2=3.3V Vo1=5V Vo2=33V ILIM=100k IPGOOD=1mA VPGOOD=5V MCTL=5V www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 4/33 2010.03 - Rev.A BD9528MUV Output condition table Input EN1 Low Low High High Low Low High High Output REG2(3.3V) DC/DC1 OFF OFF OFF OFF OFF OFF OFF OFF ON OFF ON OFF ON ON ON ON Technical Note CTL Low Low Low Low High High High High EN2 Low High Low High Low High Low High REG1(5V) OFF OFF OFF OFF ON ON ON ON DC/DC2 OFF OFF OFF OFF OFF ON OFF ON CTL pin is connected to VIN pin with 1M resistor(pull up) internal IC. EN pin is connected to AGND pin with 1M resistor(pull down) internal IC. Block Diagram, Application circuit Vo2 Adjustable Vo1 Adjustable BOOT2 VIN BOOT1 VIN PGND2 3 2 1 31 REG1 32 REG1 22 23 24 26 PGND1 25 SW2 SW1 HG2 HG1 LG2 REG1 REG1 LG1 AGND Short through Protection Circuit SLLMTM Block CL1 SCP1 OVP1 CL2 SCP2 OVP2 13 Short through Protection Circuit SLLMTM Block FS2 10 Short Circuit Protect SCP2 REG1 MCTL MCTL FS1 15 SCP1 RFS1 Short Circuit Protect 5 PGOOD2 20 PGOOD1 Power Good Over Voltage Protect OVP2 Timer Timer Timer Power Good FS2 FS1 EN2 TSD EN1 FB2 REF UVLO Timer H3RegTM Controller Block H3RegTM Controller Block Over Voltage Protect OVP1 FB1 REF Thermal Protection 11 6 SS2 Over Current Protect CL2 14 REF 12 SS1 19 Over Current Protect CL1 ILIM2 REF ILIM1 17 PGND1 SW1 8 SW2 PGND2 MCTL EN2 4 Vo1 5V Reg 3.3V Reg SLLM Mode Control Reference Block REG1 EN1 21 MCTL1 MCTL2 Vo2 VIN CTL REG1 1uF 5.528V REG1 VIN REG2 REG2 www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 3.3V 5V Vo1 7 9 30 29 28 18 16 27 5/33 2010.03 - Rev.A REG1 BD9528MUV Pin Configuration PGOOD1 BOOT1 MCTL1 ILIM1 SW1 HG1 EN1 SS1 Technical Note 24 PGND1 LG1 Vo1 REG2 REG1 VIN LG2 PGND2 25 26 27 28 29 30 31 32 1 SW2 23 22 21 20 19 18 17 16 15 14 MCTL2 FS1 FB1 AGND Input MCTL1 Low Low High High MCTL2 Low High Low High Control Mode SLLM QLLM Forced Continuous Mode Forced Continuous Mode FIN 13 12 REF 11 10 9 2 HG2 3 BOOT2 4 EN2 5 PGOOD2 6 SS2 7 Vo2 8 ILIM2 FB2 FS2 CTL MCTL pin is connected to AGND pin with 500k resistor ( pull down) internal IC Pin Function Table PIN No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 reverse PIN name SW2 HG2 BOOT2 EN2 PGOOD2 SS2 Vo2 ILIM2 CTL FS2 FB2 REF AGND FB1 FS1 MCTL2 ILIM1 MCTL1 SS1 PGOOD1 EN1 BOOT1 HG1 SW1 PGND1 LG1 Vo1 REG2 REG1 VIN LG2 PGND2 FIN PIN Function Highside FET source pin 2 Highside FET gate drive pin 2 HG Driver power supply pin 2 Vo2 ON/OFF pin (High=ON, Low,OPEN=OFF) Vo2 Power Good Open Drain Output pin Vo2 Soft start pin Vo2 Output voltage sense pin OCP setting pin 2 Linear regulator ON/OFF pin (High,OPEN=ON, Low=OFF) Input pin for setting Vo2 frequency Vo2 output voltage feedback pin Output voltage setting pin Input pin Ground Vo1 output voltage feedback pin Input pin for setting Vo1 frequency Mode switch pin 2 ( OPEN = L ) OCP setting pin 1 Mode switch pin 1 ( OPEN = L ) Vo1 Soft start pin Vo1 Power Good Open Drain Output pin Vo1 ON/OFF pin (High=ON, Low,OPEN=OFF) HG Driver power supply pin Highside FET gate drive pin 1 Highside FET source pin 1 Lowside FET source pin 1 Lowside FET gate drive pin 1 Vo1 Output voltage sense pin 3.3V Linear regulator output pin 5V Linear regulator output pin Power supply input pin Lowside FET gate drive pin 2 Lowside FET source pin 2 Exposed Pad1, connect to GND www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 6/33 2010.03 - Rev.A BD9528MUV Electrical characteristic curves (Reference data) Technical Note HG 10V/div SW 10V/div HG 10V/div SW 10V/div HG 10V/div SW 10V/div LG 5V/div LG 5V/div 2us Fig.1 Switching Waveform (Vo=5V, PWM, Io=0A) 2us Fig.2 Switching Waveform (Vo=5V, PWM, Io=8A) 10us Fig.3 Switching Waveform (Vo=5V, QLLM, Io=0A) LG 5V/div HG 10V/div SW 10V/div HG 10V/div SW 10V/div HG 10V/div SW 10V/div 10us Fig.4 Switching Waveform (Vo=5V, SLLM, Io=0A) LG 5V/div 2us Fig.5 Switching Waveform (Vo=3.3V, PWM, Io=0A) LG 5V/div 2us Fig.6 Switching Waveform (Vo=3.3V, PWM, Io=8A) LG 5V/div HG 10V/div SW 10V/div HG 10V/div SW 10V/div HG 10V/div SW 10V/div 10us Fig.7 Switching Waveform (Vo=3.3V, QLLM, Io=0A) LG 5V/div 10us Fig.8 Switching Waveform (Vo=3.3V, SLLM, Io=0A) LG 5V/div 2us Fig.9 Switching Waveform (Vo=1V, PWM, Io=0A) LG 5V/div HG 10V/div SW 10V/div HG 10V/div SW 10V/div HG 10V/div SW 10V/div 2us Fig.10 Switching Waveform (Vo=1V, PWM, Io=8A) LG 5V/div 10us Fig.11 Switching Waveform (Vo=1V, QLLM, Io=0A) LG 5V/div 10us Fig.12 Switching Waveform (Vo=1V, SLLM, Io=0A) LG 5V/div www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 7/33 2010.03 - Rev.A BD9528MUV Electrical characteristic curves (Reference data) - Continued 100 80 60 40 20 0 1 10 100 Io[mA] 1000 10000 Technical Note 100 80 100 80 7V [%] [%] 7V 12V 21V 40 20 0 1 10 21V [%] 7V 12V 60 12V 60 40 20 0 1 10 21V 100 Io[mA] 1000 10000 100 Io[mA] 1000 10000 Fig.13 Efficiency (Vo=5V, PWM) Fig.14 Efficiency (Vo=5V, QLLM) Fig.15 Efficiency (Vo=5V, SLLM) 100 100 100 80 5V 80 80 7V 60 [%] 40 20 0 1 10 100 Io[mA] 7V 12V [%] 12V [%] 60 40 20 0 7V 60 12V 40 20 0 21V 21V 21V 1000 10000 1 10 100 Io[mA] 1000 10000 1 10 100 Io[mA] 1000 10000 Fig.16 Efficiency (Vo=3.3V, PWM) Fig.17 Efficiency (Vo=3.3V, QLLM) Fig.18 Efficiency (Vo=3.3V, SLLM) 100 80 60 [%] 40 20 0 1 10 100 Io[mA] 1000 10000 100 100 7V 12V 21V [%] 80 60 40 20 0 1 7V 12V 21V [%] 80 60 40 20 0 7V 12V 21V 10 100 Io[mA] 1000 10000 1 10 100 Io[mA] 1000 10000 Fig.19 Efficiency (Vo=1V, PWM) 20us Vo 100mV/div Fig.20 Efficiency (Vo=1V, QLLM) 20us Vo 100mV/div Fig.21 Efficiency (Vo=1V, SLLM) 20us Vo 100mV/div IL 5A/div Io 5A/div IL 5A/div Io 5A/div IL 5A/div Io 5A/div Fig.22 Transient Response (Vo=5V, PWM, Io=08A) Fig.23 Transient Response (Vo=5V, PWM, Io=80A) Fig.24 Transient Response (Vo=3.3V, PWM, Io=08A) www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 8/33 2010.03 - Rev.A BD9528MUV Electrical characteristic curves (Reference data) - Continued 20us Vo 100mV/div Technical Note 20us Vo 100mV/div 20us Vo 100mV/div IL 5A/div Io 5A/div IL 5A/div Io 5A/div Fig.25 Transient Response (Vo=3.3V, PWM, Io=80A) Fig.26 Transient Response (Vo=1V, PWM, Io=08A) Fig.27 Transient Response (Vo=1V, PWM, Io=80A) IL 5A/div Io 5A/div Vo 50mV/div Vo 50mV/div Vo 50mV/div 2us Fig.28 Output Voltage (Vo=5V, PWM, Io=0A) 2us Fig.29 Output Voltage (Vo=5V, PWM, Io=8A) 10us Fig.30 Output Voltage (Vo=5V, QLLM, Io=0A) Vo 50mV/div Vo 50mV/div Vo 50mV/div 2us Fig.31 Output Voltage (Vo=5V, SLLM, Io=0A) 2us Fig.32 Output Voltage (Vo=3.3V, PWM, Io=0A) 2us Fig.33 Output Voltage (Vo=3.3V, PWM, Io=8A) Vo 50mV/div Vo 50mV/div Vo 50mV/div 10us Fig.34 Output Voltage (Vo=3.3V, QLLM, Io=0A) 2us Fig.35 Output Voltage (Vo=3.3V, SLLM, Io=0A) 2us Fig.36 Output Voltage (Vo=1V, PWM, Io=0A) www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 9/33 2010.03 - Rev.A BD9528MUV Electrical characteristic curves (Reference data) - Continued Technical Note Vo 50mV/div Vo 50mV/div Vo 50mV/div 2us Fig.37 Output Voltage (Vo=1V, PWM, Io=8A) 10us Fig.38 Output Voltage (Vo=1V, QLLM, Io=0A) 2us Fig.39 Output Voltage (Vo=1V, SLLM, Io=0A) EN1 5V/div Vo1 2V/div EN2 5V/div Vo2 2V/div EN1 5V/div Vo1 2V/div EN2 5V/div Vo2 2V/div EN1 5V/div Vo1 2V/div EN2 5V/div Vo2 2V/div Fig.40 Wake up waveform (EN1=EN2) Fig.41 Wake up waveform (EN2EN1) Fig.42Wake up waveform (EN1EN2) IOUT-frequency (VOUT=5V, R(FS)=68k) IOUT-frequency (VOUT=5V, R(FS)=68k) 500 EN1 5V/div frequency [kHz] 500 400 VIN=7.5V VIN=12V VIN=18V frequency [kHz] PGOOD1 2V/div EN2 5V/div PGOOD2 2V/div 450 450 400 VIN=7.5V VIN=12V VIN=18V 350 350 300 0 1 2 3 4 5 6 7 IOUT [A] 300 0 1 2 3 4 5 6 7 IOUT [A] Fig.43Wake up waveform (EN1/2PGOOD1/2) Fig.44 Io-frequency (Vo=5V, PWM, RFS=68k) Fig.45 Io-frequency (Vo=3.3V, PWM, RFS=68k) 2.5 VOUT=5V VOUT=3.3V 700 600 VOUT=5V 500 frequency [kHz] 400 300 200 VOUT=3.3V VOUT [V] 5.500 5.000 2 ONTIME [usec] 4.500 4.000 3.500 3.000 2.500 2.000 1.500 1.000 0.500 VIN=7.5V(-5 VIN=21V-5 VIN=7.5V(75 VIN=21V75 1.5 1 0.5 100 0 0 50 RFS [k] 100 150 0 0 50 RFS [k] 100 150 0.000 0 2 4 6 8 IOUT [A] 10 12 14 16 Fig.46 FS-ONTIME Fig.47 FS-frequency Fig.48 Ta-IOCP (Vo=5V) www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 10/33 2010.03 - Rev.A BD9528MUV Electrical characteristic curves (Reference data) - Continued IOUT - REG1 voltage 3.500 Technical Note IOUT - REG2 voltage 3.4 3.3 REG2 voltage [V] 3.2 3.1 3 2.9 2.8 5.1 5 VIN=7.5V(-5 3.000 REG1 voltage [V] 2.500 VIN=21V-5 VIN=7.5V(75 VIN=21V75 4.9 4.8 4.7 4.6 VOUT [V] 2.000 1.500 1.000 0.500 4.5 0.000 0 2 4 6 8 IOUT [A] 10 12 14 16 0 50 100 150 200 250 0 50 100 150 200 250 IOUT [mA] IOUT [mA] Fig.49 Ta-IOCP (Vo=3.3V) Fig.50 IREG1-REG1 Fig.51 IREG2-REG2 www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 11/33 2010.03 - Rev.A BD9528MUV Pin Descriptions Technical Note VIN (30 pin) This is the main power supply pin. The input supply voltage range is 5.5V to 25V. The duty cycle of BD9528MUV is determined by input voltage and control output voltage. Therefore, when VIN voltage fluctuated, the output voltage also becomes unstable. Since VIN line is also the input voltage of switching regulator, stability depends on the impedance of the voltage supply. It is recommended to establish bypass capacitor and CR filter suitable for the actual application. CTL (9 pin) When CTL pin voltage is at least 2.3V, the status of the linear regulator output becomes active (REG1=5V, REG2=3.3V). Conversely, the status switches off when CTL pin voltage goes lower than 0.8V. The switching regulator doesn't become active when the status of CTL pin is low, if the status of EN pin is high. (CTL pin is connected to VIN pin with 1M resistor(pull up) internal IC) EN1, 2 (21 pin, 4 pin) When EN pin voltage is at least 2.3V, the status of the switching regulator becomes active. Conversely, the status switches off when EN pin voltage goes lower than 0.8V. (EN pin is connected to AGND pin with 1M resistor(pull down) internal IC) REG1 (29 pin) This is the output pin for 5V linear regulator and also active in power supply for driver and control circuit of the inside. The standby function for REG1 is determined by CTL pin. The voltage is 5V, with 100mA current ability. It is recommended that a 10F capacitor (X5R or X7R) be established between REG1 and GND. REG2 (28 pin) This is the output pin for 3.3V linear regulator. The standby function for REG2 is determined by CTL. The voltage is 3.3V, with 50mA current ability. It is recommended that a 10F capacitor (X5R or X7R) be established between REG2 and GND. REF (12 pin) This is the setting pin for output voltage of switching regulator. This IC controls the voltage in the status of REFFB. FB 1, 2 (14 pin, 11 pin) This is the feedback pin from the output of switching regulator. This IC controls the voltage in the status of REFFB. Vo1 (27 pin) This is the output discharge pin, and output voltage feedback pin for frequency setting. When the voltage is beyond 4.4V from the external power supply during operation, it supplies REG1. Vo2 (7 pin) This is the output discharge pin, and output voltage feedback pin for frequency setting. SS1, 2 (19 pin, 6 pin) This is the setting pin for soft start. The rising time is determined by the capacitor connected between SS and GND, and the fixed current inside IC after it is the status of low in standby mode. It controls the output voltage till SS voltage catch up the REF pin to become the SS terminal voltage. FS1, 2 (15 pin, 10 pin) This is the input pin for setting the frequency. It is available to set it in frequency range is 200KHz to 500kHz. ILIM1, 2 (17 pin, 8 pin) BD9528MUV detects voltage differential between SW and PGND, and set OCP. OCP setting current value is determined by the resistance value of ILIM pin. FET of various Ron is available. PGOOD 1, 2 (20 pin, 5 pin) This is the open drain pin for deciding the output of switching regulator. MCTL1, 2 (18 pin, 16 pin) This is the switching shift pin for SLLM (Simple Light Load Mode). MCTL pin is at low level when it goes lower than 0.8V, and at high level when it goes higher than 2.3V. (MCTL pin is connected to AGND pin with 500k resistor(pull down) internal IC) AGND (13 pin) This is the ground pin. www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 12/33 2010.03 - Rev.A BD9528MUV Technical Note BOOT1, 2 (22 pin, 3 pin) This is the power supply pin for high side FET driver. The maximum voltage range to GND pin is to 35V, to SW pin is to 7V. In switching operations, the voltage swings from (VIN+REG1) to REG1 by BOOT pin operation. HG1, 2 (23 pin, 2 pin) This is the highside FET gate drive pin. It is operated in switching between BOOT to SW. In case the output MOS is 3ohm /the status of Hi, 2ohm/the status of Low, it is operated hi-side FET gate in high speed. SW1, 2 (24 pin, 1 pin) This is the ground pin for high side FET drive. The maximum voltage range to GND pin is to 30V. Switching operation swings from the status of BOOT to the status of GND. LG1, 2 (26 pin, 31 pin) This is the lowside FET gate drive pin. It is operated in switching between REG1 to PGND. In case the output MOS is 2ohm /the status of Hi, 0.5ohm/the status of Low, it is operated low-side FET gate in high speed. PGND1, 2 (25 pin, 32 pin) This is the ground pin for low side FET drive. www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 13/33 2010.03 - Rev.A BD9528MUV Technical Note Explanation of Operation 3 The BD9528MUV is a 2ch synchronous buck regulator controller incorporating ROHM's proprietary H REG CONTROLLA control system. Because controlling of output voltage by a comparator, high response is realized with not relying on the switching frequency. And, when VOUT drops due to a rapid load change, the system quickly restores VOUT by extending the TON time interval. Thus, it serves to improve the regulator's transient response. Activating the Light Load Mode will also exercise Simple Light Load Mode (SLLM) control when the load is light, to further increase efficiency. H3RegTM control Comparator for output voltage control FB Vout/Vin Circuit VIN HG SW LG VOU T A B Driver Internal reference voltage REF Transient Circuit (Normal operation) FB REF HG When FB falls to a reference voltage (REF), the drop is detected, activating the H3REG CONTROLLA system. LG (VOUT drops due to a rapid load change) FB REF Io HG LG tON + When VOUT drops due to a rapid load change, and the voltage remains below reference voltage after the programmed tON time interval has elapsed (Output of a comparator for output voltage control =H), the system quickly restores VOUT by extending the tON time, improving the transient response. (when VIN drops) VIN tON1 tON2 tON3 tON4 H3RegTM tON4+ HG tOFF1 tOFF2 tOFF3 tOFF4=tOFF3 tOFF4=tOFF3 LG FB REF Output voltage drops FB=REF If VIN voltage drops because of the battery voltage fall, ontime tON and offtime tOFF is determined by the following formula: tON=VOUT/VINxI/f and tOFF=(VIN-VOUT)/VINxf so that tON lengthen and tOFF shorten to keep output voltage constant. However, if VIN still drops and tOFF equals to tminoff (tminoffMinimum OFF time, regulated inside IC) , because tOFF cannot shorten any 3 TM more, as a result output voltage drops. In H Reg system, lengthening tON time than regulated tON (lengthen tON time until FBREF) www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 14/33 2010.03 - Rev.A BD9528MUV Technical Note enables to operate stable not to drop the output voltage even if VIN turns to be low. With the reason above, it is suitable for 2-cell battery. Light Load Control (SLLM) FB REF HG In SLLM, when the status of LG is OFF and the coil current is within 0A (it flows to SW from VOUT.), SLLM function is operated to prevent output next HG. The status of HG is ON, when FB falls below reference voltage again. LG 0A (QLLM) REF HG FB In QLLM, when the status of LG is OFF and the coil current is within 0A (it flows to SW from VOUT.), QLLM function is operated to prevent output next HG. Then, FB falls below the output programmed voltage within the programmed time (typ=40s), the status of HG is ON. In case FB doesn't fall in the programmed time, the status of LG is ON forcedly and VOUT falls. As a result, he status of next HG is ON. LG 0A MCTL1 L L H MCTL2 L H X Control mode SLLM QLLM PWM Running PWM PWM PWM The BD9528MUV operates in PWM mode until SS pin reaches cramp voltage (2.5V), regardless of the control mode setting, in order to operate stable during the operation. . Attention: H Reg CONTROLLA monitors the supplying current from capacitor to load, using the ESR of output capacitor, and realize the rapid response. Bypass capacitor used at each load (Ex. Ceramic capacitor) exercises the effect with connecting to each load side. Do not put a ceramic capacitor on COUT side of power supply. 3 TM COUT Load Timing Chart * Soft Start Function EN TSS SS Soft start is exercised with the EN pin set high. Current control takes effect at startup, enabling a moderate output voltage "ramping start." Soft start timing and incoming current are calculated with formulas (2) and (3) below. Soft start time Tss= REFxCss [sec] (2) 2.3A(typ) VOUT Incoming current IIN IIN= CoxVOUT Tss [A] (3) (Css: Soft start capacitor; Co: Output capacitor) www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 15/33 2010.03 - Rev.A BD9528MUV Technical Note Notes when waking up with CTL pin or VIN pin If EN pin is High or short (or pull up resistor) to REG1 pin, IC starts up by switching CTL pin, the IC might fail to start up (SCP function) with the reason below, please be careful of SS pin and REF pin capacitor capacity. REG1 REG2 VIN FB CTL Inner reference circuit BG SCP circuit Delay SCP REF SCP_REF 1ms(typ.) SCP SS PWM (Switching control signal) CTL (VIN) REG1 REG2 REG1, REG2 REG1 UVLO cancellation BG 0.49V(typ) SCP_REF (REF start-up timeSS start-up time) SCP function masked SCP mask cancellation REF SS FB FB starts up as SS reference SS FB (REF start-up timeSS start-up time) REF FB SS SCP mask SCP mask cancellation FB starts up as REF reference After the end of SS wake-up, within SCP delay time (1ms), if REF voltage does not reach SCP_REF(0.49V), SCP turns ON and shut down. SCP function is masked until SS pin reaches cramp voltage (2.5V). www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 16/33 2010.03 - Rev.A BD9528MUV Output Discharge Technical Note VIN,CTL EN It will be available to use if connecting VOUT pin to DC/DC output. (Total about 100) . Discharge function operates when EN='L' UVLO=ON(If input voltage is low) SCP Latch time TSD=ON. The function at output discharge time is shown as left. (1)during EN='H'`L' If EN pin voltage is below than EN threshold voltage, output discharge function is operated, and discharge output capacitor charge. VOUT VIN, CTL REG1 VOUT The efficiency of VIN voltage drop Output Discharge Output Hi-Z UVLO ON (2) during VIIN=CTL=H0V IC is in normal operation until REG1 voltage becomes lower than UVLO voltage. However, because VIN voltage also becomes low, output voltage will drop, too. If REG1 voltage reaches the UVLO voltage, output discharge function is operated, and discharge output capacitor charge. In addition, if REG1 voltage drops, inner IC logic cannot operate, so that output discharge function does not work, and becomes output Hi-z. In case, FB has resistor against GND, discharge at the resistor. www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 17/33 2010.03 - Rev.A BD9528MUV Technical Note Timer Latch Type Short Circuit Protection FB REFx0.7 Short protection kicks in when output falls to or below REF X 0.7. When the programmed time period elapses, output is latched OFF to prevent destruction of the IC. (HG=Low, LG=Low) Output voltage can be restored either by reconnecting the EN pin or disabling UVLO. SCP 1ms(typ) EN / UVLO Over Voltage Protection FB REFx1.2 When output rise to or above REFx1.2 (typ), output over voltage protection is exercised, and low side FET goes up maximum for reducing output.(LG=High, HG=Low).When output falls, output voltage can be restored., and go back to the normal operation. HG LG Switching Over current protection circuit tON HG tON tON tON LG During the normal operation, when FB becomes less than REF, HG becomes High during the time tON, and after HG becomes OFF, it output LG. However, when inductor current exceeds ILIMIT threshold, next HG pulse doesn't pulsate until it is lower than ILIMIT level. IL www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 18/33 2010.03 - Rev.A BD9528MUV External Component Selection 1. Inductor (L) selection Technical Note IL VIN IL VOUT L Co The inductor value is a major influence on the output ripple current. As formula (4) below indicates, the greater the inductor or the switching frequency, the lower the ripple current. (VIN-VOUT)xVOUT [A](4) IL= LxVINxf The proper output ripple current setting is about 30% of maximum output current. IL=0.3xIOUTmax. [A](5) (VIN-VOUT)xVOUT L= ILxVINxf [H](6) (IL: output ripple current; f: switch frequency) Output ripple current Passing a current larger than the inductor's rated current will cause magnetic saturation in the inductor and decrease system efficiency. In selecting the inductor, be sure to allow enough margin to assure that peak current does not exceed the inductor rated current value. To minimize possible inductor damage and maximize efficiency, choose a inductor with a low (DCR, ACR) resistance. 2.Output Capacitor (CO) Selection VIN VOUT L ESR Co When determining the proper output capacitor, be sure to factor in the equivalent series resistance required to smooth out ripple volume and maintain a stable output voltage range. Output ripple voltage is determined as in formula (7) below. VOUT=ILxESR+ESLxIL/TON(7) (IL: Output ripple current; ESR: CO equivalent series resistance) In selecting a capacitor, make sure the capacitor rating allows sufficient margin relative to output voltage. Note that a lower ESR can minimize output ripple voltage. Output Capacitor Please give due consideration to the conditions in formula (8) below for output capacity, bear in mind that output rise time must be established within the soft start time frame. Capacitor for bypass capacitor is connected to Load side which connect to output in output capacitor capacity (CEXT, figure above). Please set the soft start time or over current detecting value, regarding these capacities. Co Tssx(Limit-IOUT) VOUT (8) Tss: Soft start time Limit: Over current detection Note: Improper capacitor may cause startup malfunctions. 3. Input Capacitor (Cin) Selection VIN Cin The input capacitor selected must have low enough ESR resistance to fully support large ripple output, in order to prevent extreme over current. The formula for ripple current IRMS is given in (9) below. VOUT VIN(VIN-VOUT) IRMS=IOUTx VIN [A](9) IOUT Where VIN=2xVOUT, IRMS= 2 L Co Input Capacitor A low ESR capacitor is recommended to reduce ESR loss and maximize efficiency. www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 19/33 2010.03 - Rev.A BD9528MUV 4. MOSFET Selection Technical Note MOSFET may cause the loss as below, so please select proper FET for each. VIN main switch Loss on the main MOSFET Pmain=PRON+PGATE+PTRAN = VOUT VOUT VIN xRONxIOUT2+CissxfxVDD+ 2 VIN xCrssxIOUTxf IDRIVE (10) L Co (Ron: On-resistance of FET; Ciss: FET gate capacitance; f: Switching frequency Crss: FET inverse transfer function; IDRIVE: Gate peak current) Loss on the synchronous MOSFET Psyn=PRON+PGATE = VIN-VOUT VIN xRONxIOUT2+CissxfxVDD (11) synchronous switch 5. Setting output voltage This IC is operated that output voltage is REFFB. And it is operated that output voltage is feed back to FB pin. |
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