LTC1775 - High Power No R_SENSE™ Current Mode Synchronous Step-Down Switching Regulator

LTC1775 - High Power No R_SENSE™ Current Mode Synchronous Step-Down Switching Regulator - Linear Technology（凌力尔特）

The LTC1775 is a synchronous step-down switching regulator controller that drives external N-channel power MOSFETs using few external components. Current mode control with MOSFET VDS sensing eliminates the need for a sense resistor and improves efficiency. Largely similar to the LTC1625, the LTC1775 has twice the maximum sense voltage for high current applications. The frequency of a nominal 150kHz internal oscillator can be synchronized to an external clock over a 1.5:1 frequency range. Burst Mode™ operation at low load currents reduces switching losses and low dropout operation extends operating time in battery-powered systems. A forced continuous mode control pin can assist secondary winding regulation by disabling Burst Mode operation when the main output is lightly loaded. Fault protection is provided by foldback current limiting and an output overvoltage comparator. An external capacitor attached to the RUN/SS pin provides soft start capability for supply sequencing. A wide supply range allows operation from 4V (4.3V for LTC1775I) to 36V at the input and 1.19V to VIN at the output.

Highest Efficiency Current Mode Controller

No Sense Resistor Required

300mV Maximum Current Sense Voltage

Stable High Current Operation

Dual N-Channel MOSFET Synchronous Drive

Wide VIN Range: 4V to 36V

Wide VOUT Range: 1.19V to VIN

±1% 1.19V Reference

Programmable Fixed Frequency with Injection Lock

Very Low Drop Out Operation: 99% Duty Cycle

Forced Continuous Mode Control Pin

Optional Programmable Soft Start

Pin Selectable Output Voltage

Foldback Current Limit

Output Overvoltage Protection

Logic Controlled Micropower Shutdown: IQ< 30µA

Available in 16-Lead Narrow SSOP and SO Packages

Notebook Computers

Automotive Electronics

Battery Chargers

Distributed Power Systems

器件型号	封装	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量)
LTC1775CGN	SSOP-16	C	$5.90	$5.00
LTC1775CGN#PBF	SSOP-16	C	$5.90	$5.00
LTC1775CGN#TR	SSOP-16	C		$5.06
LTC1775CGN#TRPBF	SSOP-16	C		$5.06
LTC1775CS	SO-16	C	$5.55	$4.65
LTC1775CS#PBF	SO-16	C	$5.55	$4.65
LTC1775CS#TR	SO-16	C		$4.71
LTC1775CS#TRPBF	SO-16	C		$4.71
LTC1775IGN	SSOP-16	I	$7.35	$6.00
LTC1775IGN#PBF	SSOP-16	I	$7.35	$6.00
LTC1775IGN#TR	SSOP-16	I		$6.06
LTC1775IGN#TRPBF	SSOP-16	I		$6.06
LTC1775IS	SO-16	I	$6.85	$5.60
LTC1775IS#PBF	SO-16	I	$6.85	$5.60
LTC1775IS#TR	SO-16	I		$5.66
LTC1775IS#TRPBF	SO-16	I		$5.66

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