LTC1751-5 Micropower, Regulated Charge Pump DC/DC Converters

The LTC®1751 family are micropower charge pump DC/DC converters that produce a regulated output voltage at up to 100mA. The input voltage range is 2V to 5.5V. Extremely low operating current (20µA typical with no load) and low external parts count (one flying capacitor and two small bypass capacitors at VIN and VOUT) make them ideally suited for small, battery-powered applications.

The LTC1751 family operate as Burst Mode™ switched capacitor voltage doublers to achieve ultralow quiescent current. They have thermal shutdown capability and can survive a continuous short circuit from Vout to GND. The PGOOD pin on the LTC1751-3.3 and LTC1751-5 indicates when the output voltage has reached its final value and if the output has an undervoltage fault condition. The FB pin of the adjustable LTC1751 can be used to program the desired output voltage or current. An optional soft-start capacitor may be used at the SS pin to prevent excessive inrush current during start-up.

The LTC1751 family is available in an 8-pin MSOP package

产品特点 Features

5V Output Current:
100mA (VIN >/= 3V)
3.3V Output Current:
80mA (VIN >/= 2.5V)
Ultralow Power: 20µA Quiescent Current
Regulated Output Voltage: 3.3V ±4%, 5V ±4%, ADJ
VIN Range: 2V to 5.5V
800kHz Switching Frequency
No Inductors
Very Low Shutdown Current: <2µA
Shutdown Disconnects Load from VIN
PowerGood/Undervoltage Output
Adjustable Soft-Start Time
Short-Circuit/Thermal Protection
Available in 8-Pin MSOP

应用

Li-Ion Battery Backup Supplies
Local 3V and 5V Conversion
Smart Card Readers
PCMCIA Local 5V Supplies
White LED Backlighting

典型应用图

参数

LTC1751-5 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) *
LTC1751EMS8	MSOP	8	E	$2.67	$2.25
LTC1751EMS8#PBF	MSOP	8	E	$2.67	$2.25
LTC1751EMS8#TR	MSOP	8	E		$2.31
LTC1751EMS8#TRPBF	MSOP	8	E		$2.31
LTC1751EMS8-3.3	MSOP	8	E	$2.67	$2.25
LTC1751EMS8-3.3#PBF	MSOP	8	E	$2.67	$2.25
LTC1751EMS8-3.3#TR	MSOP	8	E		$2.31
LTC1751EMS8-3.3#TRPBF	MSOP	8	E		$2.31
LTC1751EMS8-5	MSOP	8	E	$2.67	$2.25
LTC1751EMS8-5#PBF	MSOP	8	E	$2.67	$2.25
LTC1751EMS8-5#TR	MSOP	8	E		$2.31
LTC1751EMS8-5#TRPBF	MSOP	8	E		$2.31

LTC1751-5 数据手册及相关资料下载

数据手册(英文) : LTC1751/LTC1751-3.3/LTC1751-5 - Micropower, Regulated Charge Pump DC/DC Converters.PDF
设计要点 (英文) : DN231 - Tiny Regulators Drive White LED Backlights.PDF
可靠性数据 : R402 Reliability Data .PDF