General Description
The TD6811 is a high efficiency monolithic synchronous
buck regulator using a constant frequency, current mode
architecture. The device is available in an adjustable
version and fixed output voltages of 1.5V and 1.8V.
Supply current during operation is only 20mA and drops
to ≤1mA in shutdown. The 2.5V to 5.5V input voltage
range makes the TD6811 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 1.5MHz, 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. The TD6811 is available in
TSOT23-5 package.
Features
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High Efficiency: Up to 96%
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High Efficiency at light loads
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Very Low Quiescent Current: only 20uA During
Operation
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1.2A Output Current
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2.5V to 5.5V Input Voltage Range
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1.5MHz Constant Frequency Operation
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No Schottky Diode Required
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Low Dropout Operation: 100% Duty Cycle
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0.6V Reference Allows Low Output Voltages
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Shutdown Mode Draws ≤1uA Supply Current
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Current Mode Operation for Excellent Line and Load
Transient Response
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Overtemperature Protected
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TSOT23-5 Package is Available
Applications
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Cellular Telephones
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Personal Information Appliances
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Wireless and DSL Modems
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Digital Still Cameras
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MP3 Players
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Portable Instruments
