LTC1751 - Micropower, Regulated Charge Pump DC/DC Converters

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.

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

Typical Application

Applications

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

Packaging

Order Information

Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC1751EMS8-3.3#PBF	MS-8	E	$2.67	$2.25
LTC1751EMS8-3.3#TRPBF	MS-8	E		$2.31
LTC1751EMS8-5#PBF	MS-8	E	$2.67	$2.25
LTC1751EMS8-5#TRPBF	MS-8	E		$2.31
LTC1751EMS8#PBF	MS-8	E	$2.67	$2.25
LTC1751EMS8#TRPBF	MS-8	E		$2.31

Demo Boards

Part Number	Description	Price
DC323A-A	LTC1751EMS8-5 \| Regulated Charge Pump DC/DC Converter, 3V to 5.5V Input, 5Vout @ 100mA	Contact Factory
DC323A-B	LTC1751EMS8-3.3 \| Regulated Charge Pump DC/DC Converter, 2V to 4.5V Input, 3.3Vout @ 40mA	Contact Factory
DC323A-C	LTC1751EMS8 \| Regulated Charge Pump DC/DC Converter, 2.5V to 4.5V Input, 4Vout @ 75mA	Contact Factory