LTC1773 - LTC1773是Synchronous Step-Down DC/DC Controller

LTC1773是LINEAR凌力尔特公司的一款外部开关电源控制器产品，LTC1773是LTC1773是Synchronous Step-Down DC/DC Controller，本站介绍了LTC1773的封装应用图解、特点和优点、功能等，并给出了与LTC1773相关的LINEAR元器件型号供参考。

LTC1773 - LTC1773是Synchronous Step-Down DC/DC Controller - 外部开关电源控制器 - 电源管理 - 凌力尔特

LTC1773 - Synchronous Step-Down DC/DC Controller

LTC1773 - Synchronous Step-Down DC/DC Controller - Linear Technology（凌力尔特）

功能描述

The LTC1773 is a current mode synchronous buck regulator controller that drives external complementary power MOSFETs using a fixed frequency architecture. The operating supply range is from 2.65V to 8.5V, making it suitable for 1- or 2-cell lithium-ion battery powered applications. Burst Mode operation provides high efficiency at low load currents. 100% duty cycle provides low dropout operation which extends operating time in battery-operated systems.

The operating frequency is internally set at 550kHz, allowing the use of small surface mount inductors. For switching-noise sensitive applications, it can be synchronized up to 750kHz. Peak current limit is user programmable with an external high side sense resistor. A SYNC/FCB control pin guarantees regulation of secondary windings regardless of load on the main output by forcing continuous operation. Burst Mode operation is inhibited during synchronization or when the SYNC/FCB pin is pulled low to reduce noise and RF interference. Soft-start is provided by an external capacitor.

Synchronous rectification increases efficiency and eliminates the need for a Schottky diode, saving components and board space. The LTC1773 comes in a 10-lead MSOP package.

特点

High Efficiency: Up to 95%

Constant Frequency 550kHz Operation

VIN from 2.65V to 8.5V

VOUT from 0.8V to VIN

OPTI-LOOP? Compensation Minimizes COUT

Synchronizable up to 750kHz

Selectable Burst Mode Operation

Low Quiescent Current: 80μA

Low Dropout Operation: 100% Duty Cycle

Secondary Winding Regulation

Soft-Start