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SC632A Datasheet(PDF) 1 Page - Semtech Corporation |
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SC632A Datasheet(HTML) 1 Page - Semtech Corporation |
1 / 15 page POWER MANAGEMENT SC632A 1MHz Fixed 5.0V Output Charge Pump Regulator Features Input voltage range — 2.95V to 5.5V V OUT tolerance — 5.0V ±3% Continuous output current — 275mA Peak output current — 400mA Three charge pump modes — x, .5x and 2x Output ripple voltage — 50mV PP , typical Short circuit, over-voltage, and over-temperature protection Soft-start functionality Shutdown current — 0.µA, typical Ultra thin package — 2 x 2 x 0.6 (mm) Lead-free and halogen-free WEEE and RoHS compliant Applications Mobile phones Tablets USB On-The-Go Multi-LED backlit LCDs Compact flash/CF+ products Digital video cameras DVI/HDMI ports Wi-Fi base stations Modems Set-top boxes Description The SC632A is a high-current voltage regulator using Semtech’s proprietary low-noise charge pump technol- ogy. The charge pump provides a low EMI solution compared to inductive boost regulators. Performance is optimized for use in single Li-Ion battery cell applications. The regulator provides the performance of a linear, low drop-out (LDO) voltage regulator when the input is greater than 5.0V. Unlike an LDO, drop-out is avoided when the input is less than 5.0V. Instead, a charge pump is activated to provide voltage boost and the head-room needed for voltage regulation. The SC632A’s charge pump has three modes of operation: 2x, .5x, and x modes. 2x and .5x are voltage boost modes that deliver current to the load in each of two phases. The x mode turns off the charge pump, deliver- ing current through an LDO. Hysteresis is provided to prevent chatter between charge pump modes. When active, the charge pump provides low-ripple operation at MHz. Typically the output ripple is 50mVpp at the maximum continuous current rating of 275mA. A small 2.2µF capacitor is recommended for all four capaci- tors. The full rated output current is provided when 2.2µF is used for both bucket capacitors. At the output, a 2.2µF capacitor decouples the load and provides smoothing for mode transitions, while another 2.2µF is used to decouple the input. SC632A VBAT VOUT = 5.0V @ 275mA OUT C1+ IN GND EN C1- C2+ C2- CIN 2.2µF COUT 2.2µF C1 2.2µF C2 2.2µF Chip enable Typical Application Circuit Revision .0 US Patent: 7,808,220 © 20 Semtech Corporation |
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