LTC1622 Low Input Voltage Current Mode Step-Down DC/DC Controller

The LTC®1622 is a constant frequency current mode step-down DC/DC controller providing excellent AC and DC load and line regulation. The device incorporates an accurate undervoltage feature that shuts the LTC1622 down when the input voltage falls below 2V.

The LTC1622 boasts a ±1.9% output voltage accuracy and consumes only 350µA of quiescent current. For applications where efficiency is a prime consideration and the load current varies from light to heavy, the LTC1622 can be configured for Burst Mode™ operation. Burst Mode operation enhances low current efficiency and extends battery run time. Burst Mode operation is inhibited during synchronization or when the SYNC/MODE pin is pulled low to reduce noise and possible RF interference.

High constant operating frequency of 550kHz allows the use of a small inductor. The device can also be synchronized up to 750kHz for special applications. The high frequency operation and the available 8-lead MSOP package create a high performance solution in an extremely small amount of PCB area.

To further maximize the life of the battery source, the P-channel MOSFET is turned on continuously in dropout (100% duty cycle). In shutdown, the device draws a mere 15µA

产品特点 Features

High Efficiency
Constant Frequency 550kHz Operation
VIN Range: 2V to 10V
Multiampere Output Currents
OPTI-LOOP™ Compensation Minimizes COUT
Selectable, Burst Mode Operation
Low Dropout Operation: 100% Duty Cycle
Synchronizable up to 750kHz
Current Mode Operation for Excellent Line and Load Transient Response
Low Quiescent Current: 350µA
Shutdown Mode Draws Only 15µA Supply Current
±1.9% Reference Accuracy
Available in 8-Lead MSOP

参数

应用

1- or 2-Cell Li-Ion Powered Applications
Cellular Telephones
Wireless Modems
Portable Computers
Distributed 3.3V, 2.5V or 1.8V Power Systems
Scanners
Battery-Powered Equipment

典型应用图

LTC1622 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) *
LTC1622CMS8	MSOP	8	C	$2.35	$2.05
LTC1622CMS8#PBF	MSOP	8	C	$2.35	$2.05
LTC1622CMS8#TR	MSOP	8	C		$2.11
LTC1622CMS8#TRPBF	MSOP	8	C		$2.11
LTC1622CS8	SO	8	C	$2.10	$1.85
LTC1622CS8#PBF	SO	8	C	$2.10	$1.85
LTC1622CS8#TR	SO	8	C		$1.91
LTC1622CS8#TRPBF	SO	8	C		$1.91
LTC1622IS8	SO	8	I	$2.60	$2.20
LTC1622IS8#PBF	SO	8	I	$2.60	$2.20
LTC1622IS8#TR	SO	8	I		$2.26
LTC1622IS8#TRPBF	SO	8	I		$2.26

LTC1622 数据手册及相关资料下载

数据手册(英文) : LTC1622 - Low Input Voltage Current Mode Step-Down DC/DC Controller.PDF
应用指南 (英文) : AN84 - linear Technology Magazine Circuit Collection, Volume IV .PDF
设计要点 (英文) : DN208 - Low Dropout 550kHz DC/DC Controller Operates from Inputs as Low as 2V.PDF
可靠性数据 : R302 Reliability Data .PDF