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features

Up to 150-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

PowerPAD? 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

description

The TPS60111 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 150 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 TPS60111 can start

into full load with loads as low as 33 Ω.

The TPS60111 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 TPS60111 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).