LTC3443 High Current Micropower 600kHz Synchronous Buck-Boost DC/DC Converter

The LTC®3443 is a high efficiency, fixed frequency, buckboost DC/DC converter that operates from input voltages above, below or equal to the output voltage. The part is pin for pin compatible with its predecessor, the LTC3441, with a lower operating frequency (600kHz), and a VC pin clamp circuit during Burst Mode operation. The topology incorporated in the IC provides a continuous transfer function through all operating modes, making the product ideal for single Lithium Ion or multicell applications where the output voltage is within the battery voltage range.

The device includes two 0.10Ω N-channel MOSFET switches and two 0.11Ω P-channel switches. External Schottky diodes are optional, and can be used for a moderate efficiency improvement. The operating frequency is internally set to 600kHz and can be synchronized up to 1.2MHz. Quiescent current is only 28µA in Burst Mode operation, maximizing battery life in portable applications. Burst Mode operation is user controlled and can be enabled by driving the MODE/SYNC pin high. If the MODE/ SYNC pin is driven low or with a clock, then fixed frequency switching is enabled.

Other features include a 1µA shutdown, soft-start control, thermal shutdown and current limit. The LTC3443 is available in a thermally enhanced 12-lead (4mm × 3mm) DFN Package

产品特点 Features

Regulated Output with Input Above, Below or Equal to the Output
Single Inductor, No Schottky Diodes
High Efficiency: Up to 96%
28µA Quiescent Current in Burst Mode® Operation
Up to 1.2A Continuous Output Current from a Single Lithium-Ion
True Output Disconnect in Shutdown
2.4V to 5.5V Input Range
2.4V to 5.25V Output Range
600kHz Fixed Frequency Operation
Synchronizable Oscillator
Selectable Burst Mode or Fixed Frequency Operation
<1µA Quiescent Current in Shutdown
Small, Thermally Enhanced 12-Lead (4mm × 3mm × 0.8mm) DFN package

应用

Handheld Computers
Handheld Instruments
MP3 Players
Digital Cameras

典型应用图

参数

LTC3443 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) *
LTC3443EDE	DFN	12	E	$5.07	$3.55
LTC3443EDE#PBF	DFN	12	E	$5.07	$3.55
LTC3443EDE#TR	DFN	12	E		$3.65
LTC3443EDE#TRPBF	DFN	12	E		$3.65

LTC3443 数据手册及相关资料下载

数据手册(英文) : LTC3443 - High Current Micropower 600kHz Synchronous Buck-Boost DC/DC Converter.PDF
设计要点 (英文) : Design Solutions 10 - Active Voltage Positioning Reduces Output Capacitors.PDF
可靠性数据 : R415 Reliability Data .PDF