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LTC1704B

Linear Technology
Part Number LTC1704B
Manufacturer Linear Technology
Description 550kHz Synchronous Switching Regulator Controller Plus Linear Regulator Controller
Published Mar 27, 2005
Detailed Description LTC1704/LTC1704B 550kHz Synchronous Switching Regulator Controller Plus Linear Regulator Controller FEATURES s s DESCR...
Datasheet PDF File LTC1704B PDF File

LTC1704B
LTC1704B

Overview
LTC1704/LTC1704B 550kHz Synchronous Switching Regulator Controller Plus Linear Regulator Controller FEATURES s s DESCRIPTIO s s s s s s s s s s U APPLICATIO S s s s Dual Regulated Outputs: One Switching Regulator and One Linear Regulator Excellent DC Accuracy: ±1.
5% for Switcher and ±2% for Linear Regulator External N-Channel MOSFET Architecture No External Current Sense Resistor Required Burst Mode® Operation at Light Load (LTC1704) Continuous Switching at Light Load (LTC1704B) Linear Regulator with Programmable Current Limit Linear Regulator with Programmable Start-Up Delay Low Shutdown Current: <150µA High Efficiency Over Wide Load Current Range PGOOD Flag Monitors Both Outputs Small 16-Pin Narrow SSOP Package The LTC®1704/LTC1704B include a high power synchronous switching regulator controller plus a linear regulator controller.
The switching regulator controller is designed to drive a pair of N-channel MOSFETs in a voltage mode, synchronous buck configuration to provide the main supply.
The constant frequency, true PWM architecture switches at 550kHz, minimizing external component size, cost and optimizing load transient performance.
The LTC1704 features automatic transition to power saving Burst Mode operation at light loads.
The LTC1704B does not shift into Burst Mode operation at light loads, eliminating low frequency output ripple at the expense of light load efficiency.
The linear regulator controller is designed to drive an external NPN power transistor to provide up to 2A of current to an auxiliary load.
The LTC1704/LTC1704B deliver better than ±1.
5% DC accuracy at the switcher outputs and ±2% at the linear regulator outputs.
High performance feedback loops allow the circuit to keep total output regulation within ±5% under all transient conditions.
An open-drain PGOOD output indicates when both outputs are within ±10% of their regulated values.
Multiple Logic Supply Generator Distributed Power Applications High Efficiency Power Conversion , LTC a...


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