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LTC1772B

Linear
Part Number LTC1772B
Manufacturer Linear
Description Constant Frequency Current Mode Step-Down DC/DC Controller
Published Apr 18, 2016
Detailed Description LTC1772B Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23 FEATURES n Burst Mode® Operation Disabled...
Datasheet PDF File LTC1772B PDF File

LTC1772B
LTC1772B

Overview
LTC1772B Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23 FEATURES n Burst Mode® Operation Disabled for Lower Output Ripple at Light Loads n High Efficiency: Up to 94% n High Output Currents Easily Achieved n Wide VIN Range: 2.
5V to 9.
8V n Constant Frequency 550kHz Operation n Low Dropout: 100% Duty Cycle n Output Voltage Down to 0.
8V n Current Mode Operation for Excellent Line and Load Transient Response n Shutdown Mode Draws Only 8µA Supply Current n Tiny 6-Lead TSOT-23 Package APPLICATIONS n One or Two Lithium-Ion-Powered Applications n Cellular Telephones n Wireless Devices n Portable Computers n Distributed 3.
3V, 2.
5V or 1.
8V Power Systems DESCRIPTION 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.
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 in dropout (100% duty cycle).
High constant operating frequency of 550kHz allows the use of a small external inductor.
The LTC1772B is available in a small footprint 6-lead TSOT-23.
For a Burst Mode operation enabled version of the LTC1772B, please refer to the LTC1772 data sheet.
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION 10k 220pF 16 ITH/RUN PGATE LTC1772B 2 GND 3 VFB VIN SENSE– 5 4 R1 0.
03Ω L1 M1 4.
7μH + D1 C1 10μF 10V C2A 47μF 6V VIN 2.
5V TO 9.
8V VOUT 2.
5V C2B 2A 1μF 10V 174k C1: TAIYO YUDEN LMK325BJ106K-T C2A: SANYO 6TPA47M C2B: AVX 0805ZC105KAT1A D1: MOTOROLA MBRM120T3 L1: MURATA LQN6C-4R7 M1: FAIRCHILD FDC638P R1: IRC LRC-LR1206-01-R030...


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