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| RT9164 1A Fixed and Adjustable Low Dropout Positive Voltage Regulators General Description The RT9164 series of high performance positive voltage regulators is designed for applications requiring low dropout performance at fully rated current. Additionally, the RT9164 series provides excellent regulation over variations in line and load. Outstanding performance features at rated include current, low fast dropout transient Features Low Dropout Performance, 1.4V Max. Full Current Rating Over Line and Temperature Fast Transient Response 1% Output Voltage Accuracy 2.5V, 2.85V, 3.3V, and 3.5V Fixed/Adjustable Output Voltage SOT-223 and TO-252 Packages response, internal current-limiting, and thermalshutdown protection of the output device. The RT9164 series of three terminal regulators offers fixed and adjustable voltage options available in space-saving SOT-223, and TO-252 packages. Applications Active SCSI Termination Low Voltage Microcontrollers Switching Power Supply Post-Regulator Ordering Information RT9164Package type G : SOT-223 L : TO-252 (DPAK) LR : TO-252 Operating temperature range C: Commercial standard Output voltage Default : Adjustable 25 : 2.5V 28 : 2.85V 33 : 3.3V 35 : 3.5V Pin Configurations Part Number RT9164CG Pin Configurations TOP VIEW 1. ADJ/GND 1 2 3 (Plastic SOT-223) 2. VOUT (TAB) 3. VIN TOP VIEW 1. ADJ/GND 2. VOUT (TAB) RT9164- CL (Plastic TO-252) 1 2 3 3. VIN TOP VIEW 1. VIN 2. GND (TAB) RT9164- CLR (Plastic TO-252) 1 2 3 3. VOUT DS9164-08 May 2001 www.richtek-ic.com.tw 1 RT9164 Absolute Maximum Ratings Input Voltage Package Thermal Resistance SOT-223, JC SOT-223, JA TO-252, JC TO-252, JA 15C/W (1) 12V 60C/W 15C/W 56C/W 0C to 125C -65C to 150C 260C 2 (1) Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 sec.) Note: (1) Minimum pad size of 0.038 IN Electrical Characteristics (TA = 25C, unless otherwise specified) Parameter (1) Symbol Test Conditions IOUT = 10mA, (VIN-VOUT) = 2V, TA = 25C 10mA < IOUT < 1A, 1.4V < VIN-VOUT < 10V IOUT = 10mA, VIN = 4.0V, TJ = 25C 0 < IOUT < 1A, 4.0V < VIN < 10V 0 < IOUT < 1A, 4.25V < VIN < 10V 0 < IOUT < 1A, 4.75V < VIN < 10V IOUT = 10mA, VIN = 5V, TJ = 25C 0 < IOUT < 1A, 5.0V < VIN < 10V IOUT = 10mA, 1.5V VIN-VOUT 10V Min Typ Max Units V V V V V V V V V V % mV mV mV mV % mV mV mV mV 1.238 1.250 1.262 1.225 1.250 1.270 2.475 2.500 2.525 2.450 2.500 2.550 2.790 2.850 2.910 3.235 3.300 3.365 3.465 3.500 3.535 3.430 3.500 3.570 ----------0.1 1 1 1 1 0.2 1 1 1 1 0.3 6 6 6 6 0.4 10 10 10 15 Reference Voltage RT9164 VREF RT9164-25 RT9164-28 Output Voltage (1) IOUT = 10mA, VIN = 4.25V, TJ = 25C 2.820 2.850 2.880 VOUT IOUT = 10mA, VIN = 4.75V, TJ = 25C 3.267 3.300 3.333 RT9164-33 RT9164-35 RT9164 (1) RT9164-25 RT9164-28 RT9164-33 RT9164-35 RT9164 VLINE Line Regulation IOUT = 0mA, 4.0V VIN 12V IOUT = 0mA, 4.25V VIN 12V IOUT = 0mA, 4.75V VIN 12V IOUT = 0mA, 5.0V VIN 12V (VIN-VOUT) = 3V, 0mA IOUT 1A Load Regulation (1) RT9164-25 RT9164-28 RT9164-33 RT9164-35 VLOAD VIN = 4.0V, 0 IOUT 1A VIN = 4.25V, 0 IOUT 1A VIN = 4.75V, 0 IOUT 1A VIN = 5.0V, 0 IOUT 1A To be continued www.richtek-ic.com.tw DS9164-08 May 2001 2 RT9164 Parameter Symbol Test Conditions IOUT = 100mA Dropout Voltage (2) Min ----1000 ----- Typ 1.1 1.15 1.2 1.3 -5 5 72 65 0.2 Max Units 1.2 1.25 1.3 1.4 2000 10 10 -120 5 V V V V mA mA mA dB A A VDROP IOUT = 500mA IOUT = 800mA IOUT = 1000mA VIN = 5V (VIN-VOUT) = 2V VIN = 5V fRIPPLE = 120Hz , (VIN - VOUT) = 2V, VRIPPLE = 1VP-P 10mA IOUT 1A, VIN = 5V Current Limit Minimum Load Current RT9164 Quiescent Current Ripple Rejection Adjust Pin Current Adjust Pin Current Change Notes: ILIMIT RT9164-XX IQ PSRR IADJ IADJ -- (1) Low duty cycle pulse testing with Kelvin connections. (2) VOUT and VREF = 1%. Function Block Diagram VIN S.O.A. CURRENT LIMITING AMPLIFIER LIMIT SENSE THERMAL OVERLOAD VOLTAGE REGULATION AMPLIFIER VOUT VREF ADJ/GND Pin Description Pin Name ADJ/GND VOUT VIN Pin Function Adjust or Ground Output Voltage Power Input DS9164-08 May 2001 www.richtek-ic.com.tw 3 RT9164 Typical Application Circuit VIN = 5V RT9164 VIN VOUT ADJ VREF + C1 10F VOUT = 3.45V R1 133 1% R2 232 1% + C2 10F Tantalum R2 ) + I ADJ R2 R1 IADJ VOUT = VREF (1+ (1) C1 needed if device is far from filter capacitors. (2) C2 required for stability. Fig. 1 Adjustable Voltage Regulator RT9164-28 VIN VOUT GND + + 22F 18 -27 Lines 10F Fig. 2 Active SCSI Bus Terminator VIN = 5V RT9164-33 VIN VOUT GND + C1 10F VOUT 3.3V + C2 10F Tantalum IQ (1) C1 needed if device is far from filter capacitors. (2) C2 required for stability. Fig. 3 Fixed Voltage Regulator www.richtek-ic.com.tw DS9164-08 May 2001 4 RT9164 Typical Operating Characteristics Load Regulation 0 Adjust Pin Current 100 90 Load = 1A Output Voltage Deviation (%) Adjust Pin Current ( A) -0.05 -0.1 -0.15 -0.2 -0.25 -0.3 -0.35 -50 -25 0 80 70 60 50 40 30 20 10 0 Temperature ( C) 25 50 75 100 125 -50 -25 0 25 50 75 100 125 Temperature ( C) RT9164-ADJ Ripple Rejection 0 Ripple Rejection & Current -20 -30 Ripple Rejection(dB) -20 Ripple Rejection(dB) COUT = 20F Tantalum CADJ = 22F Electrolytic IOUT = 0.5A COUT = 20F Tantalum CADJ = 22F Electrolytic -40 -50 -60 -70 -80 -90 fRIPPLE = 20KHz fRIPPLE = 120Hz -40 -60 -80 -100 10 100 Frequency (Hz) 1K 10K 100K -100 0 200 ILOAD (mA) 400 600 800 1.2 1.0 Dropout Voltage (VIN-VOUT ) Short Circuit Current (A) TJ = 25C TJ = 125C 2.5 Short-Circuit Current Dropout Voltage (V) 2.0 TJ = 125C 0.8 0.6 0.4 0.2 0.0 0 1.5 TJ = 25C 1.0 0.5 0.0 200 400 600 800 0 2.5 5 7.5 10 Output Current (mA) Input/Output Differential (V) DS9164-08 May 2001 www.richtek-ic.com.tw 5 RT9164 Temperature Stability 3.4 3.2 1.28 Temperature Stability (VREF) 3.3V 1.27 Output Voltage (V) 3 2.8 2.6 2.4 2.2 -50 -25 0 25 50 75 100 125 Output Voltage (V) 1.26 2.85V 1.25 2.5V 1.24 1.23 -50 -25 0 Temperature (C) Temperature ( C) 25 50 75 100 125 RT9164-2.5 Transient Response Load Load Transient Response 0.3 Output Voltage Deviation (V) 0.2 COUT = 10F Tantalum 0.1 1 0> RT9164-2.5 Load Transient Response Load Transient Response 0.3 Output Voltage Deviation (V) CIN = 10F Tantalum VIN = 4V Preload = 0.1A T VOUT = 2.5V CIN = 10F Tantalum VIN = 4V Preload = 0.1A VOUT = 2.5V 0.2 COUT = 10F Tantalum 0.1 01 > -0.1 T -0.1 -0.2 Load Current (A) 0.5 Load Current (A) T T -0.2 1.0 T T 2 0> 02 > -1.0 0 10 20 30 40 50 60 70 80 90 100 -0.5 0 10 20 30 40 50 60 70 80 90 100 Time (S) Time (S) 0.3 Output Voltage Deviation (V) RT9164-2.85Transient Response Load Load Transient Response Output Voltage Deviation (V) RT9164-2.85 Load Transient Response Load Transient Response 0.3 CIN = 10F Tantalum VIN = 4.35V Preload = 0.1A T 0.2 COUT = 10F Tantalum 0.1 1 0> VOUT = 2.85V CIN = 10F Tantalum VIN = 4.35V Preload = 0.1A VOUT = 2.85V 0.2 COUT = 10F Tantalum 0.1 01 > -0.1 T -0.1 -0.2 Load Current (A) 0.5 Load Current (A) T T -0.2 1.0 T T 0> 2 -0.5 0 10 20 30 40 50 60 70 80 90 100 02 > -1.0 0 10 20 30 40 50 60 70 80 90 100 Time (S) Time (S) www.richtek-ic.com.tw DS9164-08 May 2001 6 RT9164 RT9164-3.3 Load Transient Response Load Transient Response Output Voltage Deviation (V) 0.3 Output Voltage Deviation (V) CIN = 10F Tantalum VIN = 4.8V Preload = 0.1A T VOUT = 3.3V 0.3 RT9164-3.3 Transient Response Load Load Transient Response CIN = 10F Tantalum VOUT = 3.3V 0.2 COUT = 10F Tantalum 0.1 1 0> 0.2 COUT = 10F Tantalum 0.1 VIN = 4.8V 1 0> Preload = 0.1A -0.1 -0.2 Load Current (A) -0.1 T 0.5 Load Current (A) T T -0.2 1.0 T T 2 0> 02 > -1.0 0 10 20 30 40 50 60 70 80 90 100 -0.5 0 10 20 30 40 50 60 70 80 90 100 Time (S) Time (S) Line Transient Response 4.5 Input Voltage (V) COUT = 10F Tantalum 3.5 IOUT = 0.1A 2.5 1.5 T T VOUT + 0.5 Output Voltage Deviation (mV) 20 T 0> 1 2 -20 > -40 0 10 20 30 40 50 60 70 80 90 100 Time (S) DS9164-08 May 2001 www.richtek-ic.com.tw 7 RT9164 Application Information Output voltage adjustment Like most regulators, the RT9164 regulates the output by comparing the output voltage to an internally generated reference voltage. On the adjustable version as shown in Fig.4, the VREF is available externally as 1.25V between VOUT and ADJ. The voltage ratio formed by R1 and R2 should be set to conduct 10mA (minumum output load). The output voltage is given by the following equation: VOUT = VREF (1+ R1 R2 200. For example, with R1 = 124 and fRIPPLE = 120Hz, the CADJ should be > 11F. Output Capacitor RT9164 requires a capacitor from VOUT to GND to provide compensation feedback to the internal gain stage. This is to ensure stability at the output terminal. Typically, a 10F tantalum or 50F aluminum electrolytic is sufficient. Note: It is important that the ESR for this capacitor ) + IADJ x R2 does not exceed 0.5. The output capacitor does not have a theoretical upper limit and increasing its value will increase stability. COUT = 100F or more is typical for high current regulator design. VOUT R1 + R2 10F On fixed versions of RT9164, the voltage divider is provided internally. VIN RT9164 VIN VOUT ADJ + VREF IADJ 65A Load Regulation When the adjustable regulator is used (Fig.5), the best load regulation is accomplished when the top of the resistor divider (R1) is connected directly to the output pin of the RT9164. When so connected, RP is not multiplied by the divider ratio. For Fixed output version, the top of R1 is internally connected to the output and ground pins can be connected to low side of the load. RP Parasitic Line Resistance 10F + CADJ Fig. 4 Basic Adjustable Regulator Input Bypass Capacitor An input capacitor is recommended. A 10F tantalum on the input is a suitable input bypassing for almost all applications. Adjust Terminal Bypass Capacitor The adjust terminal can be bypassed to ground with a bypass capacitor (CADJ) to improve ripple rejection. This bypass capacitor prevents ripple from being amplified as the output voltage is increased. At any ripple frequency, the impedance of the CADJ should be less than R1 to prevent the ripple from being amplified: (2 * fRIPPLE * CADJ) < R1 RT9164 V IN VIN VOUT GND R1 (Connect R1 to case R2) R2 RL Connect R2 to load Fig. 5 Best Load Regulation Using Adjustable Output Regulator Thermal Protection The R1 is the resistor between the output and the adjust pin. Its value is normally in the range of 100- RT9164 has thermal protection which limits junction temperature to 150C. However, device functionality DS9164-08 May 2001 www.richtek-ic.com.tw 8 RT9164 is only guaranteed to a maximum junction temperature of +125C. The power dissipation and junction temperature for RT9164 in DPAK package are given by PD = (VIN - VOUT) x IOUT TJUNCTION = TAMBIENT + (PD x JA) Note: TJUNCTION must not exceed 125C Current Limit Protection RT9164 is protected against overload conditions. Current protection is triggered at typically 1.6A. Thermal Consideration The RT9164 series contain thermal limiting circuitry designed to protect itself from over-temperature conditions. Even for normal load conditions, maximum junction temperature ratings must not be exceeded. As mention in thermal protection section, we need to consider all sources of thermal resistance between junction and ambient. It includes junction-tocase, case-to-heat-sink interface, and heat sink thermal resistance itself. Junction-to-case thermal resistance is specified from the IC junction to the bottom of the case directly below the die. Proper mounting is required to ensure the best possible thermal flow from this area of the package to the heat sink. The case of all devices in this series is electrically connected to the output. Therefore, if the case of the device must be electrically isolated, a thermally conductive spacer is recommended. DS9164-08 May 2001 www.richtek-ic.com.tw 9 RT9164 Package Information D D1 C B L e e A b H Symbol A b B C D D1 e H L Dimensions In Millimeters Min -0.610 3.302 6.706 6.299 2.896 2.261 0.229 0.914 Max 1.803 0.787 3.708 7.290 6.706 3.150 2.362 0.330 -- Dimensions In Inches Min -0.024 0.130 0.264 0.248 0.114 0.089 0.009 0.036 Max 0.071 0.031 0.146 0.287 0.264 0.124 0.093 0.013 -- 3-Lead SOT-223 Plastic Surface Mount www.richtek-ic.com.tw DS9164-08 May 2001 10 RT9164 D B D1 E L1 A C b1 b L3 L2 e b2 U V Symbol A B b b1 b2 C D D1 E e L1 L2 L3 U V Dimensions In Millimeters Min 2.184 0.889 0.508 0.457 0.457 6.350 5.207 5.334 2.108 9.398 0.508 0.635 3.810 Ref. 3.048 Ref. Max 2.388 2.032 0.889 0.584 0.584 6.731 5.461 6.223 2.438 10.414 -1.016 Dimensions In Inches Min 0.086 0.035 0.020 0.018 0.018 0.250 0.205 0.210 0.083 0.370 0.020 0.025 Max 0.094 0.080 0.035 0.023 0.023 0.265 0.215 0.245 0.096 0.410 -0.040 1.016 Ref. 0.040 Ref. 0.150 Ref. 0.120 Ref. 3-Lead TO-252 Plastic Surface Mount Package DS9164-08 May 2001 www.richtek-ic.com.tw 11 |
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