Datasheet Analog Devices LTC1772B — Datenblatt

LTC1772B
Constant Frequency
Current Mode Step-Down
DC/DC Controller in SOT-23
FEATURES DESCRIPTION n The LTC®1772B is a constant frequency current mode
step-down DC/DC controller providing excellent AC and
DC load and line regulation. The device incorporates an
accurate undervoltage lockout feature that shuts down the
LTC1772B when the input voltage falls below 2.0V. n Burst Mode® Operation Disabled for Lower Output
Ripple at Light Loads
High Efficiency: Up to 94%
High Output Currents Easily Achieved
Wide VIN Range: 2.5V to 9.8V
Constant Frequency 550kHz Operation
Low Dropout: 100% Duty Cycle
Output Voltage Down to 0.8V
Current Mode Operation for Excellent Line and Load
Transient Response
Shutdown Mode Draws Only 8µA Supply Current
Tiny 6-Lead TSOT-23 Package The LTC1772B provides a ± 2.5% output voltage accuracy
and consumes only 270μA of quiescent current. In shutdown, the device draws a mere 8μA.
To further maximize the life of a battery source, the
external P-channel MOSFET is turned on continuously …