Semtech | SC632AULTRT

The SC632AULTRT is a high-current voltage regulator using low-noise charge pump technology. It 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 5.0 V. Unlike an LDO, drop-out is avoided when the input is less than 5.0 V. 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, 1.5x, and 1x modes. 2x and 1.5x are voltage boost modes that deliver current to the load in each of two phases. The 1x mode turns off the charge pump, delivering current through an LDO. Hysteresis is provided to prevent chatter between charge pump modes. When active, the charge pump provides low-ripple operation at 1 MHz. Typically the output ripple is 50 mVpp at the maximum continuous current rating of 275 mA.

Features:

• Input voltage range — 2.95 V to 5.5 V
• VOUT tolerance — 5.0 V ±3%
• Continuous output current — 275 mA
• Peak output current — 400 mA
• Three charge pump modes — 1x, 1.5x and 2x
• Output ripple voltage — 50 mVPP , typical
• Short circuit, over-voltage, and over-temperature protection
• Soft-start functionality
• Shutdown current — 0.1 µA, typical
• Ultra thin package — 2 x 2 x 0.6 (mm)
• Lead-free and halogen-free
• WEEE and RoHS compliant

Applications:

• 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