The TPS60110PWPR step-up, regulated charge pump generates a 5-V ±4% output voltage from a 2.7-V to 5.4-V input voltage (three alkaline, NiCd, or NiMH batteries; or, one lithium or lithium ion battery). Output current is 300 mA from a 3-V input. Only four external capacitors are needed to build a complete low-noise dc/dc converter. The push-pull operating mode of two single-ended charge pumps assures the low output voltage ripple as current is continuously transferred to the output. From a 3-V input, the TPS60110PWPR can start into full load with loads as low as 16 Ω.
The TPS60110PWPR features either constant frequency mode to minimize noise and output voltage ripple or the power-saving pulse-skip mode to extend battery life at light loads. The TPS60110PWPR switching frequency is 300 kHz. The logic shutdown function reduces the supply current to 1-µA (max) and disconnects the load from the input. Special current-control circuitry prevents excessive current from being drawn from the battery during start-up. This dc/dc converter requires no inductors and has low EMI. It is available in the small 20-pin TSSOP PowerPAD™ package (PWP).
Feature
Up to 300-mA Output Current
Less Than 10-mVpp Output Voltage Ripple
No Inductors Required/Low EMI
Regulated 5-V ±4% Output
Only Four External Components Required
Up to 90% Efficiency
2.7-V to 5.4-V Input Voltage Range
60-µA Quiescent Supply Current
0.05-µA Shutdown Current
Load Isolated in Shutdown
Space-Saving Thermally-Enhanced TSSOP PowerPADTM Package
Evaluation Module Available (TPS60110EVM-132)
Applications
Replaces DC/DC Converters With Inductors in
Battery-Powered Applications
Li-Ion Battery to 5-V Conversion
Portable Instruments
Battery-Powered Microprocessor Systems
Miniature Equipment
Backup-Battery Boost Converters
PDAs
Laptops
Handheld Instrumentation
Medical Instruments
