LTC3251是500mA High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converters

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LTC3251 - LTC3251是500mA High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converters

LTC3251是Linear公司的一款稳压的降压型充电泵产品，LTC3251是500mA High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converters，本站介绍了LTC3251的封装应用图解、特点和优点、功能等，并给出了与LTC3251相关的凌力尔特元器件型号供参考。

LTC3251 - 500mA High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converters

LTC3251 - 500mA High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converters - Linear Technology（凌力尔特）

功能描述

The LTC3251/LTC3251-1.2/LTC3251-1.5 are 2-phase charge pump step-down DC/DC converters that produce a regulated output from a 2.7V to 5.5V input. The parts use switched capacitor fractional conversion to achieve twice the typical efficiency of a linear regulator. No inductors are required. VOUT is resistor programmable from 0.9V to 1.6V or fixed at 1.2V or 1.5V, with up to 500mA of load current available.

A unique 2-phase spread spectrum architecture provides a very low noise regulated output as well as low noise at the input.* The parts have four operating modes: Continuous Spread Spectrum, Spread Spectrum with Burst Mode operation, Super Burst? mode operation and shutdown.

Low operating current (35μA in Burst Mode operation, 10μA in Super Burst mode operation) and low external parts count make the LTC3251/LTC3251-1.2/LTC3251-1.5 ideally suited for space-constrained battery-powered applications. The parts are short-circuit and overtemperature protected, and are available in a thermally enhanced 10-pin MSOP package.

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

特点

Up to 500mA Output Current

No Inductors

2.7V to 5.5V Input Voltage Range

2x Efficiency Improvement Over LDOs

2-Phase, Spread Spectrum Operation for Low Input and Output Noise

Shutdown Disconnects Load from VIN

Adjustable Output Voltage Range: 0.9V to 1.6VFixed Output Voltages: 1.2V, 1.5V

Super Burst, Burst and Burst Defeat Operating Modes

Low Operating Current: IIN = 35μA (Burst Mode Operation)

Super Burst Operating Current: IIN = 10μA

Low Shutdown Current: IIN = 0.01μA Typ

Soft-Start Limits Inrush Current at Turn-On

Short-Circuit and Overtemperature Protected

Available in a Thermally Enhanced 10-Pin MSOP Package

应用

Handheld Devices

Cellular Phones

Portable Electronic Equipment

DSP Power Supplies

以下列出了不同封装及包装形式的具体型号,并标出了直接在linear官网上订货的价格（美元）

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)
LTC3251EMSE	MS-10E	E	$2.79	$1.95
LTC3251EMSE-1.2	MS-10E	E	$2.79	$1.95
LTC3251EMSE-1.2#PBF	MS-10E	E	$2.79	$1.95
LTC3251EMSE-1.2#TR	MS-10E	E		$2.01
LTC3251EMSE-1.2#TRPBF	MS-10E	E		$2.01
LTC3251EMSE-1.5	MS-10E	E	$2.79	$1.95
LTC3251EMSE-1.5#PBF	MS-10E	E	$2.79	$1.95
LTC3251EMSE-1.5#TR	MS-10E	E		$2.01
LTC3251EMSE-1.5#TRPBF	MS-10E	E		$2.01
LTC3251EMSE#PBF	MS-10E	E	$2.79	$1.95
LTC3251EMSE#TR	MS-10E	E		$2.01
LTC3251EMSE#TRPBF	MS-10E	E		$2.01