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| 2.5V-12V Output MD1422N 14.1MAX 13.6 32 Company Name + 0.1 - Dimensions = mm DESCRIPTION The MD1422N is a high-efficiency step down DC-DC converter power integrated circuit with main MOSFET switch and synchronous 17 SHINDENGEN MD1422N 5038N + 0.1 7.5 - + Type No. 9.95 - 0.3 rectification MOSFET. The MD1422N can deliver high efficiency over a wide input voltage range. This device has output voltage digitally selectable from 2.5V to 12V. With the MD1422N you can construct a complete DC-DC converter using only a few external components. 1 (0.8) 0.8 0.35 + 0.1 - 16 Featuring an SSOP 32-pin surface mount package, the MD1422N Lot No. allows you to incorporate a very small and thin power supply on your circuit board. 0.16 M BLOCK DIAGRAM Vref 28 FEATURES Vboot 8 Vcc 6 VB 25 VG 23 VDD 18~21 " High efficiency " Wide input voltage load range 8VDC to 40VDC Up to 3ADC R/C 5 ON/OFF circuit UVLO START = 7.2V STOP = 6.7V BOOT Reference Vref=6.5V High side Vref=Vout+5.8V 100C Reference Vref=5V+5% - 150C High-Low MOS synchro-OFF High side Driver TSD " Output voltage selectable function VOUT 11~14 Error amp 2.5V to 12V " Internal Switching power device Main MOSFET for switch and - + 2.45V PWM Comp + - 3V 1V OSC f=250kHz Q R S High-Low MOS synchro-ON Prevention Low side Vref=6.5V Low side Driver + - CLM Vth= 0.1~0.2V synchronous rectification MOSFET " Fixed 250kHz PWM frequency P.GND 16 (Without external resistor and capacitor) " Overcurrent protection " Thermal shutdown function " Remote control ON/OFF 32 30 1 2 3 4,26 9 amp- ampOUT S/S OCL- OCL+ GND VGL PIN ASSIGNMENT Pin# 1 2 3 4 5 6 7 8 9 10 11 ~ 14 15 16 17 18 ~ 21 22 23 24 25 26 27 28 29 Symbol S/S OCLOCL+ GND R/C Vcc N/C Vboot VGL N/C VOUT N/C P.GND N/C VDD N/C VGH N/C VB GND VTS Vref N/C Function description Capacitor for softstart Overcurrent protection (OCL) (-) Overcurrent protection (OCL) (+) Signal GND Remote ON/OFF control terminal Input voltage Non-connection High side drive supply for main MOS Low side MOSFET gate terminal Non-connection Power stage output Non-connection Power GND Non-connection Drain of main MOS Switch Non-connection Main switch high side MOSFET gate terminal Non-connection Bootstrap capacitor between VB and VOUT Signal GND Output voltage selectable terminal Internal voltage reference Non-connection 30 31 32 AmpOUT N/C ampError Amp out Non-connection Error Amp (-) input S/S : 1 OCL- : 2 OCL+ : 3 GND : 4 R/C : 5 VCC : 6 N/C : 7 Vboot : 8 VGL : 9 N/C : 10 VOUT: 11 VOUT: 12 VOUT: 13 VOUT: 14 N/C : 15 P.GND : 16 32 : amp31 : N/C 30 : ampOUT 29 : N/C 28 : Vref 27 : VTS 26 : GND 25 : VB 24 : N/C 23 : VGH 22: N/C 21: VDD 20: VDD 19: VDD 18 : VDD 17 : N/C " Vref - Temperature compensated internal voltage. You can pull 1mA maximum for external circuit. " OSC - MCD1422N uses internal oscillator without external component. Frequency (Saw tooth wave form) is trimmed to 250kHz on chip. " Error Amp - Error Amp detects output voltage of DC-DC converter and controls PWM signal. You can adjust the loop gain when you connect feedback resistor and capacitor between AmpOUT and Amp (-). It will provide stable phase compensation. " Overcurrent protection - MD1422N uses pulse-by-pulse current protection. Current will be sensed voltage drop of external current sensing resistor. Threshold of OCL is 0.19V. 1-800-634-3654 2.5V-12V Output MD1422N ABSOLUTE MAXIMUM RATINGS Parameter Input voltage Main MOS voltage Output current (ave) Output current (peak) OCL-, OCL+ terminal voltage (Ta=25C) Units V V A A V V C C RECOMMENDED OPERATION CONDITIONS Parameter Input voltage Output voltage setting range Symbol VIN VDD IOUTave IOUTpeak VOCL VRC Tstg Tj Rating 42 42 3 4 5.5 5.5 -40 ~ 150 150 Recommendation 8 ~ 40 2.5~12 -10 ~ 80 Units V V C Operation temperature OUTPUT CURRENT DERATING FOR 8V OR HIGHER OUTPUT Output setting voltage 2.5V ~8V < = 12V Output current 3A 2.5A (Ta=25C) Remote control voltage Storage temperature Junction temperature ELECTRIC CHARACTERISTICS Parameter High side MOS Drain-source breakdown voltage High side MOS Drain interruption current High side MOS Drain-source ON resistance High side MOS Source-drain Di forward voltage Low side MOS Drain-source breakdown voltage Low side MOS Drain interruption current Low side MOS Drain-source ON resistance Low side MOS Source-drain Di forward voltage Start voltage Stop voltage Stop-start voltage hysteresis Current consumption Current consumption with remote control OFF Symbol Conditions MIN TYP MAX Units Vdss Idss Ron VSD Vdss Idss Ron VSD Vcc_start Vcc_stop Vcc_hys Icc Icc_off VRC_ON VRC_OFF IRC Vboot Vref fosc Vth_OCL IS/S Vamp T_TSD ID=1mA, VGS=0V VDS=40V, VGS=0V 42 42 6.5 6.0 -0.2 2.5 5.4 4.75 212.5 0.162 -20 2.4 - 33 33 7.2 6.7 0.5 10 1.2 6.5 5 250 0.19 -12.5 2.45 150 10 70 1.5 10 70 1.5 7.9 7.4 13 1.5 0.5 5.3 250 7.6 5.25 287.5 0.218 -5 2.5 - V uA m V V uA m V V V V mA mA V V uA V V kHz V uA V C ID=1.2A, VGS=4.5V IS=1.2A, VDS=0V ID=1mA, VGS=0V VDS=40V, VGS=0V ID=1.2A, VGS=4.5V IS=1.2A, VDS=0V Vcc=8V ~ 40V Vcc=8V ~ 40V Vcc=8V ~ 40V Vcc=8V ~ 40V Vcc=8V ~ 40V Vcc=24V Vcc=8V ~ 40V Vcc=24V Vcc=24V Vcc=24V Vcc=8V~ 40V - Remote control terminal ON voltage Remote control terminal OFF voltage Remote control terminal shorted voltage BOOT terminal voltage Internal reference voltage Internal oscillation frequency Overcurrent threshold voltage Softstart terminal current Error amplifier reference voltage Overcurrent protection operating temperature 1-800-634-3654 |
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