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LT3742

Linear Technology Corporation
Part Number LT3742
Manufacturer Linear Technology Corporation
Description 2-Phase Step-Down Switching Controller
Published Jan 14, 2009
Detailed Description Features n Wide Input Voltage Range: 4V to 30V n Wide Output Voltage Range: 0.8V to VIN n Low Shutdown IQ: 20µA n Ou...
Datasheet PDF File LT3742 PDF File

LT3742
LT3742

Overview
Features n Wide Input Voltage Range: 4V to 30V n Wide Output Voltage Range: 0.
8V to VIN n Low Shutdown IQ: 20µA n Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise n 0.
8V ±1.
5% Voltage Reference n 500kHz Current Mode Fixed Frequency Operation n Internal Boost Converter Provides Bias Rail for N-channel MOSFET Gate Drive n Power Good Voltage Monitor for Each Output n Programmable Soft-Start n 24-Lead 4mm × 4mm × 0.
75mm Package Applications n Satellite and Cable TV Set-Top Boxes n Distributed Power Regulation n Automotive Systems n Super Capacitor Charger LT3742 Dual, 2-Phase Step-Down Switching Controller Description The LT®3742 is a dual step-down DC/DC switching regulator controller that drives high side N-channel power MOSFETs.
A 500kHz fixed frequency current mode architecture provides fast transient response with simple loop compensation components and cycle-by-cycle current limiting.
The output stages of the two controllers operate 180° out of phase to reduce the input ripple current, minimizing the noise induced on the input supply, and allowing less input capacitance.
An internal boost regulator generates a bias rail of VIN + 7V to provide gate drive for the N-channel MOSFETs allowing low dropout and 100% duty cycle operation.
The LT3742 can be used for applications where both controllers need to operate independently, or where both controllers are used to provide a single higher current output.
The device is available in a thermally enhanced 4mm × 4mm QFN package.
L, LT, LTC, LTM, Linear Technology, the Linear logo, PolyPhase and Burst Mode are registered trademarks and No RSENSE is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Typical Application 8V and 5V Dual Step-Down Converter VIN VOUT1 8V 4A 47µF RUN1 VIN 10µH 4.
7µF 14V 45.
3k VIN 1µF UVLO SWB BIAS 20.
0k 10µF 0.
010Ω 6.
5µH 1.
8k 200Ω LT3742 G1 G2 SSSEWENN1SSEE11+– FB1 ...


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