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LTC1772B

Features: ` Burst ModeTM 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...

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SeekIC No. : 004401897 Detail

LTC1772B: Features: ` Burst ModeTM 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...

LTC1772B Data Sheet

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Part Number:
LTC1772B
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/11/21

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Product Details

Description



Features:

` Burst ModeTM 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 8A Supply Current
` Tiny 6-Lead SOT-23 Package


Application

·One or Two Lithium-Ion-Powered Applications
·Cellular Telephones
·Wireless Devices
·Portable Computers
· Distributed 3.3V, 2.5V or 1.8V Power Systems


Pinout

Connection Diagram


Specifications

Input Supply Voltage (VIN).........................0.3V to 10V
SENSE, PGATE Voltages .............0.3V to (VIN + 0.3V)
VFB, ITH/RUN Voltages ..............................0.3V to 2.4V
PGATE Peak Output Current (<10s) ......................... 1A
Storage Ambient Temperature Range .... 65 to 150
Operating Temperature Range (Note 2) ... 40 to 85
Junction Temperature (Note 3) .............................. 150
Lead Temperature (Soldering, 10 sec).................... 300



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 270mA of quiescent current. In shutdown, the device draws a mere 8A.

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 SOT-23.

For a Burst Mode operation enabled version of the LTC1772B, please refer to the LTC1772 data sheet.




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