FEATURES

· 1 V Input Voltage Operation Start-Up Ensured

Under Full Load on Main Output, and

Operation Down to 0.5 V

· 200 mW Output Power at Battery Voltages as

Low as 0.8 V

· Secondary 7 V Supply from a Single Inductor

· Output Fully Disconnected in Shutdown

· Adaptive Current Mode Control for Optimum

Efficiency

· High Efficiency Over Wide Operating Range

· 6 μA Shutdown Supply Current

· Output Reset Function with Programmable

Reset Period

DESCRIPTION

The UCCx9411 family of low-input voltage, single-inductor-boost converters is optimized to operate from a single

or dual alkaline cell, and steps up to a 3.3 V, 5 V, or adjustable output at 200 mW. The UCCx9411 family also

provides an auxiliary 7 V output, primarily for the gate-drive supply, which can be used for applications requiring

an auxiliary output, such as 5 V, by linear regulating. The primary output starts up under full load at input

voltages typically as low as 0.8 V with a ensured max of 1 V, and operates down to 0.5 V once the converter is

operating, thereby maximizing battery usage.

The UCCx9411 family is designed to accommodate demanding applications such as pagers and cell phones that

require high efficiency over a wide operating range of several milliwatts to a couple of hundred milli-watts. High

efficiency at low output current is achieved by optimizing switching and conduction losses with a low total

quiescent current. At higher output current, the 0.5 W switch and 1.2 W synchronous rectifier along with

continuous mode conduction provide high power efficiency. The wide input voltage range of the UCCx9411

family can accommodate other power sources such as NiCd and NiMH.

The UCCx9411 family also provides shutdown control. Packages available are the 8-pin SOIC (D) and 8-pin

TSSOP (PW) to optimize board space.