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
VER 1.2
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ACE [ ACE TECHNOLOGY CO., LTD. ]
