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| Switching Type Regulator SI-3201S Features q Output current of 3A (Ta = 25C, VIN = 8 to 18V) q High efficiency of 82% (VIN = 14V, IO = 2A) q Requires 5 external components only q Built-in reference oscillator (60kHz) q Phase internally corrected q Output voltage internally corrected q Built-in overcurrent and thermal protection circuits q Built-in soft start circuit External Dimensions (unit: mm) 3.2 0.2 0.5 10.0 0.2 4.2 0.2 2.8 0.2 4.0 0.2 7.9 0.2 16.9 0.3 a (2.0) 0.95 0.15 (4.6) 0.85 -0.1 +0.2 b 2.6 0.1 Absolute Maximum Ratings Parameter Input voltage Output voltage SQ terminal voltage with respect to ground Power Dissipation PD2 Junction temperature Storage temperature Junction to case thermal resistance Junction to ambient-air thermal resistance Tj Tstg j-c (Ta=25C) Ratings 35 3 -1 22 1.8 -40 to +150 -40 to +125 5.5 66.7 Unit V A V W W C C C/W C/W With infinite heatsink Stand-alone 1 2 3 4 5 Symbol VIN IO VO, SQ PD1 Conditions P1.7 0.7 *4 = 6.8 0.7 0.45 +0.2 -0.1 3.9 0.7 (4.3) 8.2 0.7 1. VIN 2. SWOUT 3. GND 4. VOS 5. SS a: Type No. b: Lot No. (Forming No. 1101) j-a Standard Circuit Diagram VIN 1 VIN c SI-3201S a d f b e SW Tr CQ 2 (8.0) 5.0 0.6 L1 VO Recommended Operating Conditions Parameter Input voltage Output current Operating temperature Symbol min VIN IO Top 8 0.5 -40 Ratings typ max 18 3 +85 Unit V A C Ta--PD characteristics GND C3 Conditions C1 + 5 SS h D1 g (17.9) + C2 VS 4 i GND 3 GND Electrical Characteristics Parameter Output voltage Line regulation Load regulation Efficiency * 1 Oscillation frequency Quiescent circuit current Overcurrent protection starting current Soft * 3 start terminal Low level voltage Source current when low Discharge resistance fOSC Iq IS VSSL I SSL RDIS Symbol (VIN = 14V, IOUT = 2A, Tj = 25C unless otherwise specified) Ratings min typ 5.00 max 5.20 100 50 82 50 60 5 3.1 0.2 15 25 35 4 70 10 Unit V mV mV % kHz mA A V A k VSSL = 0.2V IO = 0A VIN = 8 to 18V IO = 0.5 to 3A Conditions C1: 1000F C2: 1000F a: Internal power supply b: Thermal protection c: Reference oscillator d: Reset e: Latch & driver L1: 250H D1: RK46 (Sanken) f : Comparator g: Overcurrent protection h: Error amplifier i : Reference voltage VO VO LINE VO LOAD 4.80 *2 Notes: *1. Efficiency is calculated by the following equation: VO * IO = * 100 (%) VIN * IIN *2. A drooping-type overcurrent protection circuit is built in the IC. *3. An external voltage may not be applied to the soft start terminal. As shown in the diagram to the right, use this IC in the soft start mode with a capacitor or in the open-collector drive mode with a transistor. Leave the soft start terminal open when not using it since it is already pulled up in the IC. Cautions: (1) A high-ripple current flows through C1 and C2. Use high-ripple type 1000F or higher capacitors with low internal resistance. Refer to the respective data books for more information on reliability and electrical characteristics of the capacitor. (2) C3 is a capacitor used for soft start. (3) L1 should be a choke coil with a low core loss for switching power supplies. (4) Use a Schottky barrier diode for D1 and make sure that the reverse voltage applied to the 2nd terminal (SQ terminal) is within the maximum ratings (-1V). If you use a fast-recovery diode, the recovery voltage and the ON forward voltage may cause a reversed-bias voltage exceeding the maximum ratings to be applied to the 2nd terminal (SQ terminal). Applying a reversed-bias voltage exceeding the maximum rating to the 2nd terminal (SQ terminal) may damage the IC. (5) The 4th terminal (VS) is an output voltage detection terminal. Since this terminal has a high impedance, connect it to the positive (+) terminal of C2 via the shortest possible route. (6) Leave the 5th terminal (soft start terminal) open when not using it. It is pulled up internally. (7) To ensure optimum operating environment, connect the highfrequency current line with minimum wiring length. SI-3201S 5 SS C3 SI-3201S 5 SS SI-3201S 5 SS C3 18 s Line Regulation 5.10 s Load Regulation 5.15 5.10 5.05 5.00 4.95 4.90 4.85 s Rise Characteristics 6 5 4 Output voltage VO (V) 5.05 Output voltage VO (V) Output voltage VO (V) Io = 0A = 1A = 2A = 3A 5.00 4.95 Io = 0A = 1A = 2A = 3A VIN =18V = 10V = 7V 3 2 1 0 4.90 4.85 0 5 10 15 20 25 30 35 Input voltage V IN (V) 0 0.5 1.0 1.5 2.0 2.5 3.0 0 2 4 6 8 10 Output current IO (A) Input voltage VIN (V) s Efficiency Curve 90 s Overcurrent Protection Characteristics 6 5 Output voltage VO (V) s Overcurrent Protection Temperature Characteristics 6 5 Output voltage VO (V) 80 70 Efficiency V IN = 18V = 10V = 7V (%) 4 3 2 1 0 VIN =18V = 10V = 7V 4 3 2 1 0 TC = +100, 25, --20C 60 50 40 0 0.5 1.0 1.5 2.0 2.5 3.0 Output current IO (A) 0 1.0 2.0 3.0 4.0 5.0 0 1.0 2.0 3.0 4.0 5.0 Output current IO (A) Output current IO (A) s Ta--PD Characteristics 25 With infinite heatsink With silicone grease Heatsink: aluminum 20 Power Dissipation PD (W) 15 10 5 0 -40 0 40 80 120 160 Operating temperature Ta (C) 19 |
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