ACE721B Datasheet, PDF (1/8 Pages) ACE Technology Co., LTD. – 1.3A 1.4MHz Synchronous Step-Down Converter

ACE721B
1.3A 1.4MHz Synchronous Step-Down Converter
Description
The ACE721B series are a high efficiency monolithic synchronous buck regulator using a constant
frequency, current mode architecture. The device is available in an adjustable version. Supply current
during operation is only 40μA and drops to ≤ 1μA in shutdown. The 2.5V to 5.5V input voltage range
makes the ACE721B ideally suited for single Li-Ion battery-powered applications. 100% duty cycle
provides low dropout operation, extending battery life in portable systems. Automatic Burst Mode
operation increases efficiency at light loads, further extending battery life.
Switching frequency is internally set at 1.4MHz, allowing the use of small surface mount inductors and
capacitors.
The internal synchronous switch increases efficiency and eliminates the need for an external Schottky
diode. Low output voltages are easily supported with the 0.6V feedback reference voltage.
Features
 High Efficiency: Up to 95%
 Very Low Quiescent Current: 40μA
 1.3A Output Current
 2.5V to 5.5V Input Voltage Range
 1.4MHz Constant Frequency Operation
 No Schottky Diode Required
 Low Dropout Operation: 100% Duty Cycle
 0.6V Reference Allows Low Output Voltages
 Shutdown Mode Draws < 1μA Supply Current
 Current Mode Operation for Excellent Line and Load Transient Response
 Over temperature Protected
Application
 Mobile Phones
 Personal Information Appliances
 Wireless and DSL Modems
 Digital Still Cameras
 MP3 Players
 Portable Instruments
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