LTC1911 Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter

The LTC®1911 is a switched capacitor step-down DC/DC converter that produces a 1.5V or 1.8V regulated output from a 2.7V to 5.5V input. The part uses switched capacitor fractional conversion to achieve high efficiency over the entire input range. No inductors are required. Internal circuitry controls the step-down conversion ratio to optimize efficiency as the input voltage and load conditions vary.* Typical efficiency is over 25% higher than that of a linear regulator.

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 output filtering to further reduce conducted noise. To optimize efficiency, the part enters Burst Mode® operation under light load conditions.

Low operating current (180µA with no load, 10µA in shutdown) and low external parts count (two 1µF flying capacitors and two 10µF bypass capacitors) make the LTC1911 ideally suited for space constrained batterypowered applications. The part is short-circuit and overtemperature protected, and is available in an 8-pin MSOP package

产品特点 Features

Low Noise Constant Frequency Operation
2.7V to 5.5V Input Voltage Range
No Inductors
Typical Efficiency 25% Higher Than LDOs
Shutdown Disconnects Load from VIN
Output Voltage: 1.8V ±4% or 1.5V ±4%
Output Current: 250mA
Low Operating Current: IIN = 180µA Typ
Low Shutdown Current: IIN = 10µA Typ
Oscillator Frequency: 1.5MHz
Soft-Start Limits Inrush Current at Turn On
Short-Circuit and Overtemperature Protected
Available in an 8-Pin MSOP Package

参数

应用

Handheld Computers
Cellular Phones
Smart Card Readers
Portable Electronic Equipment
Handheld Medical Instruments
Low Power DSP Supplies

典型应用图

LTC1911 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) *
LTC1911EMS8-1.5	MSOP	8	E	$2.77	$2.34
LTC1911EMS8-1.5#PBF	MSOP	8	E	$2.77	$2.34
LTC1911EMS8-1.5#TR	MSOP	8	E		$2.40
LTC1911EMS8-1.5#TRPBF	MSOP	8	E		$2.40
LTC1911EMS8-1.8	MSOP	8	E	$2.77	$2.34
LTC1911EMS8-1.8#PBF	MSOP	8	E	$2.77	$2.34
LTC1911EMS8-1.8#TR	MSOP	8	E		$2.40
LTC1911EMS8-1.8#TRPBF	MSOP	8	E		$2.40

LTC1911 数据手册及相关资料下载

数据手册(英文) : LTC1911-1.5/LTC1911-1.8 - Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter.PDF
可靠性数据 : R415 Reliability Data .PDF