LTC3525D-3.3 - 400mA Micropower Synchronous Step-Up DC/DC Converter with Pass Through Mode

The LTC®3525D-3.3 is a high efficiency synchronous stepup DC/DC converter that can start up with an input as low as 0.85V. It offers a compact, high efficiency alternative to charge pumps in single cell or dual cell alkaline or Li-Ion applications. Only three small external components are required. The LTC3525D features a fixed output voltage of 3.3V. In shutdown, VOUT is connected to VIN through the inductor.

The device includes a 0.5Ω N-channel MOSFET switch and a 0.8Ω P-channel synchronous rectifier. Peak switch current ranges from 150mA to 400mA, depending on load, providing enhanced efficiency. Quiescent current is an ultralow 7μA, maximizing battery life in portable applications.

Other features include anti-ringing control and thermal shutdown. The LTC3525D is available in a tiny 6-Lead SC70 package.

Features

VOUT Connected to VIN in Shutdown
Up to 95% Efficiency
0.85V Minimum Input Start-Up Voltage
Fixed Output Voltage of 3.3V
Delivers 60mA at 3.3V from a 1V Input, or 140mA at 3.3V from a 1.8V Input
Burst Mode® Operation: IQ = 7μA
VIN Range: 0.5V to 4.5V
Only Three External Components
VIN > VOUT Operation
Anti-Ringing Control
Short-Circuit and Overtemperature Protection
Very Low Profile of 1mm
Tiny 6-Lead SC70 Package

Typical Application

Applications

MP3 Players
Portable Instruments
Glucose Meters
Digital Cameras

Packaging

Order Information

Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC3525DESC6-3.3#TRMPBF	SC-70	E	$2.57	$1.86
LTC3525DESC6-3.3#TRPBF	SC-70	E	$2.57	$1.81
LTC3525DISC6-3.3#PBF	SC-70	I	$2.86
LTC3525DISC6-3.3#TRMPBF	SC-70	I	$2.86	$2.00
LTC3525DISC6-3.3#TRPBF	SC-70	I	$2.86	$2.00