LTC3252 Dual, Low Noise, Inductorless Step-Down DC/DC Converter

The LTC®3252 is a switched capacitor step-down DC/DC converter that produces two adjustable regulated outputs from a single 2.7V to 5.5V input. The part uses switched capacitor fractional conversion to achieve a typical efficiency increase of 50% over that of a linear regulator. No inductors are required.

A unique constant frequency, spread spectrum architecture provides a very low noise regulated output as well as low noise at the input. The part also has Burst Mode® operation to provide high efficiency at low output currents, as well as ultralow current shutdown.

Low operating currents (60µA with both outputs enabled, 35µA with one output enabled) and low external parts count make the LTC3252 ideally suited for space-constrained battery-powered applications. The part is shortcircuit and overtemperature protected and is available in a tiny 4mm x 3mm 12-pin DFN package

产品特点 Features

2.7V to 5.5V Input Voltage Range
No Inductors
Typical Efficiency 50% Higher than LDOs
Spread Spectrum Operation
Low Input and Output Noise
Shutdown Disconnects Load from VIN
Dual Adjustable Independent Outputs (Range: 0.9V to 1.6V)
Output Current: 250mA Each Output
Low Operating Current: IIN = 60µA Typ (35µA with One Output Enabled)
Low Shutdown Current: IIN = 0.01µA Typ
Soft-Start Limits Inrush Current at Turn On
Short Circuit and Over Temperature Protected
Available in 4mm x 3mm 12-Pin DFN Package

应用

Handheld Electronic Devices
Cellular Phones
Low Voltage Logic Supplies
DSP Power Supplies
3.3V to 1.5V Conversion

典型应用图

参数

LTC3252 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) *
LTC3252EDE	DFN	12	E	$3.71	$2.60
LTC3252EDE#PBF	DFN	12	E	$3.71	$2.60
LTC3252EDE#TR	DFN	12	E		$2.70
LTC3252EDE#TRPBF	DFN	12	E		$2.70

LTC3252 数据手册及相关资料下载

数据手册(英文) : LTC3252 - Dual, Low Noise, Inductorless Step-Down DC/DC Converter.PDF
设计要点 (中文) : DN310 New Step-Down Charge Pumps are Tiny, Efficient and Very Low Noise.PDF
可靠性数据 : R415 Reliability Data .PDF