LT1949 600kHz, 1A Switch PWM DC/DC Converter

The LT®1949 is a fixed frequency step-up DC/DC converter with a 1A, 0.5 Ohms internal switch. Capable of generating 10V at 175mA from a 3.3V input, the LT1949 is ideal for generating bias voltages for large screen LCD panels. Constant frequency 600kHz operation results in a low noise output that is easy to filter and the 30V switch rating allows output voltage up to 28V using a single inductor. An external compensation pin gives the user flexibility in optimizing loop compensation, allowing small low ESR ceramic capacitors to be used at the output. The 8-lead MSOP and SO packages ensure a low profile overall solution.

The LT1949 includes a low-battery detector that stays alive when the device goes into shutdown. Quiescent current in shutdown is 25µA, while operating current is 4.5mA

产品特点 Features

1.1A, 0.5 Ohms, 30V Internal Switch
Operates with VIN as Low as 1.5V
600kHz Fixed Frequency Operation
Low-Battery Detector Active in Shutdown
Low VCESAT Switch: 410mV at 800mA
Pin-for-Pin Compatible with the LT1317B
Small 8-Lead MSOP Package and SO Packages

参数

应用

LCD Bias Supplies
GPS Receivers
Battery Backup
Portable Electronic Equipment
Diagnostic Medical Instrumentation

典型应用图

LT1949 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) *
LT1949EMS8	MSOP	8	E	$2.66	$2.25
LT1949EMS8#PBF	MSOP	8	E	$2.66	$2.25
LT1949EMS8#TR	MSOP	8	E		$2.31
LT1949EMS8#TRPBF	MSOP	8	E		$2.31
LT1949ES8	SO	8	E	$2.60	$2.20
LT1949ES8#PBF	SO	8	E	$2.60	$2.20
LT1949ES8#TR	SO	8	E		$2.26
LT1949ES8#TRPBF	SO	8	E		$2.26
LT1949IS8	SO	8	I	$2.95	$2.50
LT1949IS8#PBF	SO	8	I	$2.95	$2.50
LT1949IS8#TR	SO	8	I		$2.56
LT1949IS8#TRPBF	SO	8	I		$2.56

LT1949 数据手册及相关资料下载

数据手册(英文) : LT1949 - 600kHz, 1A Switch PWM DC/DC Converter.PDF
可靠性数据 : R365 Reliability Data .PDF