1

®

FN6538.2

ISL6341, ISL6341A, ISL6341B, ISL6341C

5V or 12V Single Synchronous Buck

Pulse-Width Modulation (PWM) Controller

The ISL6341, ISL6341A, ISL6341B, ISL6341C makes

simple work out of implementing a complete control and

protection scheme for a DC/DC stepdown converter driving

N-Channel MOSFETs in a synchronous buck topology. Since

it can work with either 5V or 12V supplies, this one family of

IC’s can be used in a wide variety of applications within a

system. It integrates the control, gate drivers, output

adjustment, monitoring and protection functions into a single

10 Ld Thin DFN package.

The ISL6341, ISL6341A, ISL6341B, ISL6341C (hereafter

referred to as “ISL6341x”, except as needed) provides single

feedback loop, voltage-mode control with fast transient

response. The output voltage can be precisely regulated to as

low as 0.8V, with a maximum tolerance of ±0.8%

over-temperature and line voltage variations. A fixed frequency

oscillator and wide duty cycle range reduces design complexity,

while balancing typical application cost and efficiency. The

frequency, duty cycle and OCP response are the only

Protection from overcurrent conditions is provided by

operation appropriately (see “Overcurrent Protection (OCP)”

on page 8 for details). This approach simplifies the

implementation and improves efficiency by eliminating the

need for a current sense resistor. The output voltage is also

monitored for undervoltage and overvoltage protection, in

addition to monitoring for a PGOOD output.

Features

• Operates from +4.5V to 14.4V Supply Voltage (for Bias)

Restrictions; see “Input Voltage Considerations” on

page 12)

UGATE Uses External Boot Diode to (5V to 12V)

- 0.8V Internal Reference; ±0.8% Tolerance

• Simple Single-Loop Control Design

- Traditional Dual Edge Modulator

- Voltage-Mode PWM Control

- Drives N-Channel MOSFETs

• Fast Transient Response

- High-Bandwidth Error Amplifier

- 0% to 85% Max Duty Cycle for ISL6341, ISL6341C

- 0% to 75% Max Duty Cycle for ISL6341A, ISL6341B

• Lossless, Programmable Overcurrent Protection

- Latch off mode (ISL6341, ISL6341B)

- Infinite Retry (Hiccup) Mode (ISL6341A)

- Infinite Retry (Hiccup) Mode; no UVP (ISL6341C)

• Output Voltage Monitoring

- Undervoltage and Overvoltage Shutdown

- PGOOD Output

• Small Converter Size in 10 Ld 3x3 Thin DFN

- 300kHz Fixed Oscillator (ISL6341, ISL6341C)

- 600kHz Fixed Oscillator (ISL6341A, ISL6341B)

- Fixed Internal Soft-Start, Capable into a Pre-biased

Load

- Enable/Shutdown Function on COMP/EN Pin

• Pb-Free (RoHS Compliant)

Applications

• Power Supplies for Microprocessors or Peripherals

- PCs, Servers, Memory Supplies

- DSP and Core Communications Processor Supplies

• Subsystem Power Supplies

- PCI, AGP; Graphics Cards; Digital TV

- SSTL-2 and DDR/DDR2/DDR3 SDRAM Bus

Termination Supply

• Cable Modems, Set-Top Boxes, and DSL Modems

• Industrial Power Supplies; General Purpose Supplies

• 5V or 12V-Input DC/DC Regulators

• Low-Voltage Distributed Power Supplies; Point of Load

Ordering Information

PART NUMBER

(Note)

PART

MARKING

TEMP.

RANGE (°C)

PACKAGE

(Pb-free)

PKG.

DWG. #

ISL6341ACRZ*

41AC

0 to +70

10 Ld 3x3 TDFN L10.3x3B

ISL6341BCRZ*

41BC

0 to +70

10 Ld 3x3 TDFN L10.3x3B

ISL6341CCRZ*

41CC

0 to +70

10 Ld 3x3 TDFN L10.3x3B

ISL6341CRZ*

341C

0 to +70

10 Ld 3x3 TDFN L10.3x3B

ISL6341AIRZ*

41AI

-40 to +85

10 Ld 3x3 TDFN L10.3x3B

ISL6341BIRZ*

41BI

-40 to +85

10 Ld 3x3 TDFN L10.3x3B

ISL6341CIRZ*

41CI

-40 to +85

10 Ld 3x3 TDFN L10.3x3B

ISL6341IRZ*

6341

-40 to +85

10 Ld 3x3 TDFN L10.3x3B

ISL6341EVAL1Z Evaluation Board

*Add “-T” suffix for tape and reel. Please refer to TB347 for details on reel

specifications.

NOTE: These Intersil Pb-free plastic packaged products employ special

Pb-free material sets, molding compounds/die attach materials, and

100% matte tin plate plus anneal (e3 termination finish, which is RoHS

compliant and compatible with both SnPb and Pb-free soldering

operations). Intersil Pb-free products are MSL classified at Pb-free peak

reflow temperatures that meet or exceed the Pb-free requirements of

IPC/JEDEC J STD-020.

Data Sheet

December 2, 2008

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

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

Copyright © Intersil Americas Inc. 2007, 2008. All Rights Reserved

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