Datasheet > FD1505

FD1505

更新时间： 2024-11-21 03:36:19

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		驱动器
页数	文件大小	规格书
2页	711K
描述
Synchronous Step-Down MOSFET Driver

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FD1505 数据手册

September 2008

FD1505 — Synchronous Step-Down MOSFET Driver

1. Overview

1.1.Features

1.3.Description

The FD1505 is an integrated high-speed, high-current

N-channel MOSFET driver for synchronous step-down

DC-DC conversion applications. When used with

Digital-DC™ PWM controllers, the FD1505 enables

dynamically adaptive dead-time control that optimizes

efficiency under all operating conditions. A dual input

PWM configuration enables this efficiency optimization

while minimizing complexity within the driver.

High-speed, High-current Drivers for Synchronous N-

Channel MOSFETs

Adaptive Dead-time Control Optimizes Efficiency

When Used with Digital-DC™ Controllers

Adjustable Gate Drive Voltage: 4.5V to 7.5V

Integrated 30V Bootstrap Schottky Diode

Capable of Driving ≥ 40A per Phase

Supports Switching Frequency up to 1.4MHz

>5A Sink Low-side Driver

Operating from a 4.5V to 7.5V input, the FD1505

combines a 5A, 0.5Ω low-side driver and a 3A, 0.8Ω

high-side driver to support high step-down buck

applications. A unique adjustable gate drive current

scheme allows the user to adjust the drive current on

both drivers to optimize performance for a wide range of

input/output voltages, load currents, power MOSFETs,

and switching frequencies up to 1.4MHz. An integrated

30V bootstrap Schottky diode is used to charge the

external bootstrap capacitor. An internal watchdog

circuit prevents excessive shoot-through currents and

protects the external MOSFET switches.

High-side Driver

<10ns Rise/Fall Times, Low Propagation Delay

Adjustable Gate Drive Strength Optimizes Efficiency

for Different V_IN, V_OUT, I_OUT, f_SW,and MOSFET

Combinations

Internal Non-overlap Watchdog Prevents Shoot-

through Currents

The FD1505 is specified over a wide -40°C to 125°C

junction temperature range and is available in an

exposed-pad, DFN-10 package.

RoHS Compliant, Pb-free

Exposed Pad 3 x 3mm DFN-10 Package

HSEL

1.2.Applications

BST

High-Efficiency, High-Current DC-DC Buck

Converters with Digital Control and PMBus™

PWMH

Shoot-

through

Protection

Multi-Phase Digital DC-DC converters with Phase

Adding/Dropping

Level

shift

V_DD

Power Train Modules

PWML

Synchronous Rectification for Secondary Side

Isolated Power Converters

FD1505

GND

LSEL

IMPORTANT NOTE:

Figure 1.

Block Diagram

For additional information, please contact

digitalpower@fairchildsemi.com.

FD1505 • Rev. 1.3.1

www.fairchildsemi.com

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