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LT1939

Features: ` Wide Input Range: 3V to 25V` Short-Circuit Protected Over Full Input Range` 2A Output Current Capability` Adjustable/Synchronizable Fixed Frequency Operation from 250kHz to 2.2MHz` Soft-Start/Tracking Capability` Output Adjustable Down to 0.8V` Adjustable Linear Regulator/Driver with 1...

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SeekIC No. : 004400921 Detail

LT1939: Features: ` Wide Input Range: 3V to 25V` Short-Circuit Protected Over Full Input Range` 2A Output Current Capability` Adjustable/Synchronizable Fixed Frequency Operation from 250kHz to 2.2MHz` Soft-...

LT1939 Data Sheet

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Part Number:
LT1939
Supply Ability:
5000

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  • 1~5000
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Total Cost: $ 0.00

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Upload time: 2024/10/27

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Product Details

Description



Features:

` Wide Input Range: 3V to 25V
` Short-Circuit Protected Over Full Input Range
` 2A Output Current Capability
` Adjustable/Synchronizable Fixed Frequency Operation from 250kHz to 2.2MHz
` Soft-Start/Tracking Capability
` Output Adjustable Down to 0.8V
` Adjustable Linear Regulator/Driver with 13mA Output Capability
` Power Good Comparator with Complementary Outputs
` Low Shutdown Current: 12A
` Thermally Enhanced 3mm * 3mm DFN Package


Application

· Automotive Battery Regulation
· Industrial Control
· Wall Transformer Regulation
· Distributed Power Regulation



Pinout

Connection Diagram


Specifications

VIN, PG, PG Operating .................................. 25V/0.3V
SW ............................................................................VIN
BST ............................................................... 45V/0.3V
BST Pin Above SW ....................................................25V
LDRV, SHDN ..............................................................15V
FB, LFB, RT/SYNC ........................................................5V
SS, VC ......................................................................2.5V
Operating Junction Temperature Range (Notes 2, 6)
    LT1939EDD ........................................ 40 to 125
    LT1939IDD ......................................... 40 to 125
Storage Temperature Range .................. 65 to 150


Description

The LT®1939 is a current mode PWM step-down DC/DC converter with an internal 2.3A switch. The wide input
range of 3V to 25V makes the LT1939 suitable for regulating power from a wide variety of sources, including
automotive batteries, industrial supplies and unregulated wall adapters.

Resistor-programmable 250kHz to 2.2MHz frequency range and synchronization capability enable optimization between effi ciency and external component size. Cycleby- cycle current limit, frequency foldback and thermal shutdown provide protection against a shorted output. The soft-start feature controls the ramp rate of the output
voltage, eliminating input current surge during start-up, and also provides output tracking.

The LT1939 contains an internal NPN transistor with feedback control which can be confi gured as a linear regulator or as a linear regulator controller.

The LT1939's low current shutdown mode (<12A) enables easy power management in battery-powered systems.




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