fd1505 Fairchild Semiconductor, fd1505 Datasheet

fd1505

Manufacturer Part Number

fd1505

Description

Fd1505 ? Synchronous Step-down Mosfet Driver

Manufacturer

Fairchild Semiconductor

Datasheet

1.FD1505.pdf (2 pages)

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FD1505 • Rev. 1.3.1

1.1. Features

1.2. Applications

FD1505 — Synchronous Step-Down MOSFET Driver

1. Overview

IMPORTANT NOTE:

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

Adjustable Gate Drive Strength Optimizes Efficiency

for Different V

Combinations

Internal Non-overlap Watchdog Prevents Shoot-

through Currents

RoHS Compliant, Pb-free

Exposed Pad 3 x 3mm DFN-10 Package

High-Efficiency, High-Current DC-DC Buck

Converters with Digital Control and PMBus™

Multi-Phase Digital DC-DC converters with Phase

Adding/Dropping

Power Train Modules

Synchronous Rectification for Secondary Side

Isolated Power Converters

For additional information, please contact

digitalpower@fairchildsemi.com

>5A Sink Low-side Driver

High-side Driver

<10ns Rise/Fall Times, Low Propagation Delay

, V

OUT

, I

OUT

, f

SW,

and MOSFET

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.

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.

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.

PWMH

PWML

Level

shift

Figure 1.

FD1505

Protection

through

Shoot-

Block Diagram

GND

HSEL

September 2008

LSEL

www.fairchildsemi.com

BST

Related parts for fd1505

fd1505 Summary of contents

Page 1

... Schottky diode is used to charge the and MOSFET SW, external bootstrap capacitor. An internal watchdog circuit prevents excessive shoot-through currents and protects the external MOSFET switches. 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 PWMH PWML ...

Page 2

... Digital-DC™, and the Zilker Labs Logo are trademarks of Zilker Labs, Inc., used under license by Fairchild Semiconductor. All other products or brand names mentioned herein are trademarks of their respective holders. © 2008 Fairchild Semiconductor Corporation FD1505 • Rev. 1.3.1 14 www.fairchildsemi.com ...

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