LTC1735 - High Efficiency Synchronous Step-Down Switching Regulator

LTC1735 - High Efficiency Synchronous Step-Down Switching Regulator - Linear Technology（凌力尔特）

The LTC1735 is a synchronous step-down switching regulator controller that drives external N-channel power MOSFETs using a fixed frequency architecture. Burst Mode? operation provides high efficiency at low load currents. The precision 0.8V reference is compatible with future generation microprocessors. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values.

The operating frequency (synchronizable up to 500kHz) is set by an external capacitor allowing maximum flexibility in optimizing efficiency. A forced continuous control pin reduces noise and RF interference and can assist secondary winding regulation by disabling Burst Mode operation when the main output is lightly loaded.

Protection features include internal foldback current limiting, output overvoltage crowbar and optional shortcircuit shutdown. Soft-start is provided by an external capacitor that can be used to properly sequence supplies. The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 4V to 30V (36V maximum).

Synchronizable/Programmable Fixed Frequency

OPTI-LOOP? Compensation Minimizes COUT

±1% Output Voltage Accuracy

Dual N-Channel MOSFET Synchronous Drive

Wide VIN Range: 4V to 36V Operation

VOUT Range: 0.8V to 6V

Internal Current Foldback

Output Overvoltage Crowbar Protection

Latched Short-Circuit Shutdown Timer with Defeat Option

Very Low Dropout Operation: 99% Duty Cycle

Forced Continuous Control Pin

Optional Programmable Soft-Start

Remote Output Voltage Sense

Power Good Output (LTC1735F Only)

Logic Controlled Micropower Shutdown: IQ < 25μA

LTC1435 Pin Compatible with Minor Component Changes

Available in 16-Lead Narrow SSOP, SO Packages and 20-Lead TSSOP Package (LTC1735F Only)

Notebook and Palmtop Computers, PDAs

Cellular Telephones and Wireless Modems

DC Power Distribution 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)
LTC1735CF	TSSOP-20	C	$3.91	$3.30
LTC1735CF#PBF	TSSOP-20	C	$3.91	$3.30
LTC1735CF#TR	TSSOP-20	C		$3.42
LTC1735CF#TRPBF	TSSOP-20	C		$3.42
LTC1735CGN	SSOP-16	C	$3.80	$3.25
LTC1735CGN#PBF	SSOP-16	C	$3.80	$3.25
LTC1735CGN#TR	SSOP-16	C		$3.31
LTC1735CGN#TRPBF	SSOP-16	C		$3.31
LTC1735CS	SO-16	C	$3.65	$3.10
LTC1735CS#PBF	SO-16	C	$3.65	$3.10
LTC1735CS#TR	SO-16	C		$3.16
LTC1735CS#TRPBF	SO-16	C		$3.16
LTC1735EGN	SSOP-16	E	$4.25	$3.60
LTC1735EGN#PBF	SSOP-16	E	$4.25	$3.60
LTC1735EGN#TR	SSOP-16	E		$3.66
LTC1735EGN#TRPBF	SSOP-16	E		$3.66
LTC1735IF	TSSOP-20	I	$6.52	$4.30
LTC1735IF#PBF	TSSOP-20	I	$6.52	$4.30
LTC1735IF#TR	TSSOP-20	I		$4.42
LTC1735IF#TRPBF	TSSOP-20	I		$4.42
LTC1735IGN	SSOP-16	I	$5.05	$4.25
LTC1735IGN#PBF	SSOP-16	I	$5.05	$4.25
LTC1735IGN#TR	SSOP-16	I		$4.31
LTC1735IGN#TRPBF	SSOP-16	I		$4.31
LTC1735IS	SO-16	I	$4.90	$4.05
LTC1735IS#PBF	SO-16	I	$4.90	$4.05
LTC1735IS#TR	SO-16	I		$4.11
LTC1735IS#TRPBF	SO-16	I		$4.11

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