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LTC1772

Features: `High Efficiency: Up to 94%` High Output Currents Easily Achieved`Wide VIN Range: 2.5V to 9.8V`Constant Frequency 550kHz Operation` Burst ModeTM Operation at Light Load`Low Dropout: 100% Duty Cycle` 0.8V Reference Allows Low Output Voltages` Current Mode Operation for Excellent Line and ...

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SeekIC No. : 004401896 Detail

LTC1772: Features: `High Efficiency: Up to 94%` High Output Currents Easily Achieved`Wide VIN Range: 2.5V to 9.8V`Constant Frequency 550kHz Operation` Burst ModeTM Operation at Light Load`Low Dropout: 100% D...

LTC1772 Data Sheet

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Part Number:
LTC1772
Supply Ability:
5000

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

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Product Details

Description



Features:

`High Efficiency: Up to 94%
` High Output Currents Easily Achieved
`Wide VIN Range: 2.5V to 9.8V
`Constant Frequency 550kHz Operation
` Burst ModeTM Operation at Light Load
`Low Dropout: 100% Duty Cycle
` 0.8V Reference Allows Low Output Voltages
` Current Mode Operation for Excellent Line and Load Transient Response
` Low Quiescent Current: 270A
` Shutdown Mode Draws Only 8mA Supply Current
` ±2.5% Reference Accuracy
` Tiny 6-Lead SOT-23 Package


Application

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


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 ......65to 150
Operating Temperature Range (Note 2) ........ 0 to 70
Junction Temperature (Note 3) .............................. 150
Lead Temperature (Soldering, 10 sec)................... 300


Description

The LTC®1772 is a constant frequency current mode stepdown DC/DC controller providing excellent AC and DC load
and line regulation. The device incorporates an accurate undervoltage lockout feature that shuts down the LTC1772 when the input voltage falls below 2.0V.

The LTC1772 boasts a ±2.5% output voltage accuracy and consumes only 270A of quiescent current. For applications where efficiency is a prime consideration, the LTC1772 is configured for Burst Mode operation, which enhances efficiency at low output current.

To further maximize the life of a battery source, the external P-channel MOSFET is turned on continuously in
dropout (100% duty cycle). In shutdown, the device draws a mere 8A. High constant operating frequency of 550kHz allows the use of a small external inductor.

The LTC1772 is available in a small footprint 6-lead SOT-23.




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