LT1956 High Voltage, 1.5A, 500kHz Step-Down Switching Regulators

The LT™1956/LT1956-5 are 500kHz monolithic buck switching regulators with an input voltage capability up to 60V. A high efficiency 1.5A, 0.2 Ohm switch is included on the die along with all the necessary oscillator, control and logic circuitry. A current mode architecture provides fast transient response and good loop stability.

Special design techniques and a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch. Patented circuitry maintains peak switch current over the full duty cycle range*. A shutdown pin reduces supply current to 25µA and the device can be externally synchronized from 580kHz to 700kHz with a logic level input.

The LT1956/LT1956-5 are available in fused-lead 16-pin SSOP and thermally enhanced TSSOP packages

产品特点 Features

Wide Input Range: 5.5V to 60V
1.5A Peak Switch Current
Small 16-Pin SSOP Package or Thermally Enhanced TSSOP Package
Saturating Switch Design: 0.2 Ohms
Peak Switch Current Maintained Over Full Duty Cycle Range
Constant 500kHz Switching Frequency
Effective Supply Current: 2.5mA
Shutdown Current: 25µA
1.2V Feedback Reference (LT1956)
5V Fixed Output (LT1956-5)
Easily Synchronizable
Cycle-by-Cycle Current Limiting

应用

High Voltage, Industrial and Automotive
Portable Computers
Battery-Powered Systems
Battery Chargers
Distributed Power Systems

典型应用图

参数

LT1956 订购信息和价格参考Package Variations and Pricing

器件型号	封装	引脚	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LT1956EFE	TSSOP	16	E	$5.36	$3.75
LT1956EFE#PBF	TSSOP	16	E	$5.36	$3.75
LT1956EFE#TR	TSSOP	16	E		$3.87
LT1956EFE#TRPBF	TSSOP	16	E		$3.87
LT1956EFE-5	TSSOP	16	E	$5.36	$3.75
LT1956EFE-5#PBF	TSSOP	16	E	$5.36	$3.75
LT1956EFE-5#TR	TSSOP	16	E		$3.87
LT1956EFE-5#TRPBF	TSSOP	16	E		$3.87
LT1956EGN	SSOP	16	E	$4.32	$3.65
LT1956EGN#PBF	SSOP	16	E	$4.32	$3.65
LT1956EGN#TR	SSOP	16	E		$3.71
LT1956EGN#TRPBF	SSOP	16	E		$3.71
LT1956EGN-5	SSOP	16	E	$4.32	$3.65
LT1956EGN-5#PBF	SSOP	16	E	$4.32	$3.65
LT1956EGN-5#TR	SSOP	16	E		$3.71
LT1956EGN-5#TRPBF	SSOP	16	E		$3.71
LT1956IFE	TSSOP	16	I	$6.36	$4.45
LT1956IFE#PBF	TSSOP	16	I	$6.36	$4.45
LT1956IFE#TR	TSSOP	16	I		$4.57
LT1956IFE#TRPBF	TSSOP	16	I		$4.57
LT1956IFE-5	TSSOP	16	I	$6.36	$4.45
LT1956IFE-5#PBF	TSSOP	16	I	$6.36	$4.45
LT1956IFE-5#TR	TSSOP	16	I		$4.57
LT1956IFE-5#TRPBF	TSSOP	16	I		$4.57
LT1956IGN	SSOP	16	I	$5.15	$4.35
LT1956IGN#PBF	SSOP	16	I	$5.15	$4.35
LT1956IGN#TR	SSOP	16	I		$4.41
LT1956IGN#TRPBF	SSOP	16	I		$4.41
LT1956IGN-5	SSOP	16	I	$5.15	$4.35
LT1956IGN-5#PBF	SSOP	16	I	$5.15	$4.35
LT1956IGN-5#TR	SSOP	16	I		$4.41
LT1956IGN-5#TRPBF	SSOP	16	I		$4.41

LT1956 数据手册及相关资料下载

数据手册(英文) : LT1956 - High Voltage, 1.5A, 500kHz Step-Down Switching Regulators.PDF
设计要点 (英文) : DN318 - Efficient Dual Polarity Output Converter Fits into Tight Spaces.PDF
设计要点 (中文) : DN318 Efficient Dual Polarity Output Converter Fits into Tight Spaces.PDF
可靠性数据 : R365 Reliability Data .PDF