LTC3250-1.5 - High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converter

The LTC®3250-1.5/LTC3250-1.2 are charge pump stepdown DC/DC converters that produce a 1.5V or 1.2V regulated output from a 2.7V to 5.5V input. The parts use switched capacitor fractional conversion to achieve typical efficiency two times higher than that of a linear regulator. No inductors are required.

A unique constant frequency architecture provides a low noise regulated output as well as lower input noise than conventional charge pump regulators.* High frequency operation (fOSC = 1.5MHz) simplifies filtering to further reduce conducted noise. The part also uses Burst Mode® operation to improve efficiency at light loads.

Low operating current (35µA with no load, <1µA in shutdown) and low external parts count (three small ceramic capacitors) make the LTC3250-1.5/LTC3250-1.2 ideally suited for space constrained battery powered applications. The parts are short-circuit and overtemperature protected, and are available in a low profile (1mm) 6-pin ThinSOT™ package.

*U.S. Patent #6, 411, 531

特点

2.7V to 5.5V Input Voltage Range
No Inductors
Li-Ion (3.6V) to 1.5V with 81% Efficiency
Low Noise Constant Frequency Operation
Output Voltages: 1.5V ±4%, 1.2V ±4%
Output Current: 250mA
Shutdown Disconnects Load from VIN
Low Operating Current: IQ = 35µA
Low Shutdown Current: ISD <1µA
Oscillator Frequency = 1.5MHz
Soft-Start Limits Inrush Current at Turn-On
Short-Circuit and Overtemperature Protected
Low Profile (1mm) ThinSOT™ Package

典型应用

应用

Handheld Computers
Cellular Phones
Digital Cameras
Handheld Medical Instruments
Low Power DSP Supplies

封装信息

**Order Information 订购型号**
器件型号	封装	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LTC3250ES6-1.2#PBF	SOT-23	E	$2.12
LTC3250ES6-1.2#TRMPBF	SOT-23	E	$2.12	$1.43
LTC3250ES6-1.2#TRPBF	SOT-23	E	$2.12	$1.41
LTC3250ES6-1.5#PBF	SOT-23	E	$2.12
LTC3250ES6-1.5#TRMPBF	SOT-23	E	$2.12	$1.43
LTC3250ES6-1.5#TRPBF	SOT-23	E	$2.12	$1.41

演示电路板


器件型号	描述	价格
DC488A	LTC3250ES6-1.5 Demo Board \| Low Noise Regulated Step-Down Charge Pump, 3.1V ≤ VIN ≤ 5.5V, Vout = 1.5V @ 250mA	$75.00