intersil ISL6420BMAEP DATA SHEET

®

www.BDTIC.com/Intersil

ISL6420BMAEP

Data Sheet

Enhanced Product (EP) Advanced Single
Synchronous Buck Pulse-Width
Modulation (PWM) Controller

The ISL6420BMAEP simplifies the implementation of a
complete control and protection scheme for a high­performance DC/DC buck converter. It is designed to drive
N-Channel MOSFETs in a synchronous rectified buck
topology, the ISL6420BMAEP integrates control, output
adjustment, monitoring and protection functions into a single
package. Additionally, the IC features an external reference
voltage tracking mode for externally referenced buck
converter applications and DDR termination supplies, as well
as a voltage margining mode for system testing in
networking DC/DC converter applications.

The ISL6420BMAEP provides simple, single feedback loop,
voltage mode control with fast transient response. The
output voltage of the converter can be precisely regulated to
as low as 0.6V, with a maximum tolerance of ±2.0% over
temperature and line voltage variations.

The operating frequency is fully adjustable from 100kHz to

1.4MHz. High frequency operation offers cost and space
savings.

The error amplifier features a 15MHz gain-bandwidth
product and 6V/µs slew rate that enables high converter
bandwidth for fast transient response. The PWM duty cycle
ranges from 0% to 100% in transient conditions. Selecting
the capacitor value from the ENSS pin to ground sets a fully
adjustable PWM soft-start. Pulling the ENSS pin LOW
disables the controller.

The ISL6420BMAEP monitors the output voltage and
generates a PGOOD (power good) signal when soft-start
sequence is complete and the output is within regulation. A
built-in overvoltage protection circuit prevents the output
voltage from going above typically 115% of the set point.
Protection from overcurrent conditions is provided by
monitoring the r
PWM operation appropriately. This approach simplifies the
implementation and improves efficiency by eliminating the
need for a current sensing resistor.

of the upper MOSFET to inhibit the

DS(ON)

Device Information

The specifications for an Enhanced Product (EP) device are
defined in a Vendor Item Drawing (VID), which is controlled
by the Defense Supply Center in Columbus (DSCC). “Hot­links” to the applicable VID and other supporting application
information are provided on our website.

October 29, 2007

FN6574.0

Features

• Specifications per DSCC VID V62/07640

• Full Mil-Temp Electrical Performance from -55°C to +125°C

• Controlled Baseline with One Wafer Fabrication Site and
One Assembly/Test Site

• Full Homogeneous Lot Processing in Wafer Fab

• No Combination of Wafer Fabrication Lots in Assembly

• Full Traceability Through Assembly and Test by
Date/Trace Code Assignment

• Enhanced Process Change Notification

• Enhanced Obsolescence Management

• Eliminates Need for Up-Screening a COTS Component

• Operates from 4.5V thru 5.5V and 5.6V thru 28V Inputs

• Excellent Output Voltage Regulation

- 0.6V Internal Reference

- ±2.0% Reference Accuracy Over Line and Temperature

• Resistor-Selectable Switching Frequency

- 100kHz to 1.4MHz

• Voltage Margining and External Reference Tracking
Modes

• Output Can Sink or Source Current

• Lossless, Programmable Overcurrent Protection

- Uses Upper MOSFET’s r

• Programmable Soft-Start

• Drives N-Channel MOSFETs

• Simple Single-Loop Control Design

- Voltage-Mode PWM Control

• Fast Transient Response

- High-Bandwidth Error Amplifier

- Full 0% to 100% Duty Cycle

• Extensive Circuit Protection Functions

- PGOOD, Overvoltage, Overcurrent, Shutdown

• Diode Emulation during Startup for Pre-Biased Load
Applications

DS(ON)

Applications

• Power Supplies for Microprocessors/ASICs

- DSP and Core Processors

- DDR SDRAM Bus Termination

• Distributed Power Systems

• Externally Referenced Buck Converters

1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774

| Intersil (and design) is a registered trademark of Intersil Americas Inc.

All other trademarks mentioned are the property of their respective owners.

Copyright © Intersil Americas Inc. 2007. All Rights Reserved

Ordering Information

www.BDTIC.com/Intersil

ISL6420BMAEP

VENDOR PART NUMBER

(Notes 1, 2) VENDOR ITEM DRAWING TEMP. RANGE (°C) PACKAGE

ISL6420BMAEP V62/07640-01XB -55 to +125 20 Ld QSOP M20.15

NOTES:

1. Add -TK suffix for 1,000 piece quantity tape and reel. Please refer to TB347 for details on reel specifications.

2. Devices must be procured to the VENDOR PART NUMBER.

Pinout

ISL6420BMAEP

(20 LD QSOP)

TOP VIEW

CDEL

PGND

LGATE

PVCC
PHASE
UGATE

BOOT

GPIO2

GPIO1/REFIN

OCSET

1
2
3
4
5
6
7
8
9

10

PGOOD

20

ENSS

19

COMP

18

FB

17

RT

16

SGND

15

VIN

14

VCC5

13
12

VMSET/MODE

11

REFOUT

PKG.

DWG. #

2

FN6574.0

October 29, 2007