ACE709G

0.85V Startup Voltage, Synchronous Step-Up Converter

VER 1.1

1

Description

The ACE709G is a high efficiency synchronous step-up converter that can provide up to 3W of power

to a boosted output from a low voltage source. Unlike most step-up converter, not only it starts up at a

very low input voltage as low as 0.85V, it also incorporates circuits that disconnect the input

from

output, during shutdown, short-circuit, output current overloading, or other events when output is higher

than the input. This eliminates the need for an external MOSFET and its control circuitry to disconnect the

input from output, and provides robust output overload protection. The ACE709G starts up from a voltage

as low as 0.85V making it ideal for applications with single-cell or two-cell alkaline, NiCd, and NiMh

batteries. A switching frequency of 2MHz minimizes solution footprint by allowing the use of tiny and low

profile inductors and ceramic capacitors. An internal synchronous MOSFET provides highest efficiency

and with a current mode control that is internally compensated, external parts count is reduced to

minimal. ACE709G is available in three output voltage options. They are 2.1V~ 5V. It is housed in a tiny

SOT23-5 package

Features

 Output Disconnect

 Short-circuit Protection

 3W Output Power

 Output to Input Reversed Current Protection

 0.85V Low Start-up Voltage

 VIN range from 0.6V to 4.5V

 Up to 96% Efficiency

 40

μA No load IQ and light load PFM Mode

 Internal Synchronous Rectifier

 Current Mode control

 Logic Control Shutdown and Thermal shutdown

 SOT23-5 Package

Application

 USB OTG for MIDs, Smartphones

 Mobile back-up Battery Chargers

 Alkaline, NiCd, and NiMh batteries applications

 USB powered devices