1

®

FN9129

PRELIMINARY

ISL6413

Triple Output Regulator with Single

Synchronous Buck and Dual LDO

The ISL6413 is a highly integrated triple output regulator

which provides a single chip solution for wireless chipset

power management. The device integrates high efficiency

synchronous buck regulator with two ultra low noise LDO

regulators. The IC accepts an input voltage range of 3.0V to

3.6V and provides three regulated output voltages: 1.8V

(PWM), 2.84V (LDO1), and another ultra-clean 2.84V

(LDO2).

The Synchronous current mode PWM regulator with

integrated N- and P-channel power MOSFET provides pre-

set 1.8V for BBP/MAC core supply. Synchronous

rectification with internal MOSFETs is used to achieve higher

efficiency and reduced number of external components.

Operating frequency is typically 750kHz allowing the use of

smaller inductor and capacitor values. The device can be

synchronized to an external clock signal in the range of

500kHz to 1MHz. The PG_PWM output indicates loss of

regulation on PWM output.

The ISL6413 also has two LDO regulators which use an

internal PMOS transistor as the pass device. LDO2 features

ultra low noise that does not typically exceed 30µV RMS to

aid VCO stability. The EN_LDO pin controls LDO1 and

LDO2 outputs. The ISL6413 also integrates a RESET

function, which eliminates the need for additional RESET IC

required in WLAN applications. The IC asserts a RESET

risen above the reset threshold. The PG_LDO output

indicates loss of regulation on either of the two LDO outputs.

Other features include over current protection for all three

outputs and thermal shutdown.

High integration and the thin Quad Flat No-lead (QFN)

package makes ISL6413 an ideal choice to power many of

today’s small form factor industry standard wireless cards

such as PCMCIA, mini-PCI and Cardbus-32.

Features

• Fully Integrated Synchronous Buck Regulator + Dual LDO

• High Output Current (For QFN package)

- PWM, 1.8V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400mA

- LDO1, 2.84V. . . . . . . . . . . . . . . . . . . . . . . . . . . . 300mA

- LDO2, 2.84V. . . . . . . . . . . . . . . . . . . . . . . . . . . . 200mA

• Ultra-Compact DC-DC Converter Design

• Stable with Small Ceramic Output Capacitors

• High conversion efficiency

• Low Shutdown supply current

• Ultra-Low Dropout Voltage for LDOs

- LDO1, 2.84V. . . . . . . . . . . . . . . 125mV (typ.) at 300mA

- LDO2, 2.84V. . . . . . . . . . . . . . . 100mV (typ.) at 200mA

• Ultra-Low Output Voltage Noise

• PG_LDO, PG_PWM and PG_PWM outputs

• Extensive circuit protection and monitoring features

- Over voltage protection

- Over current protection

- Shutdown

- Thermal Shutdown

• Integrated RESET output for microprocessor reset

• Proven Reference Design for Total WLAN System

Solution

• QFN Package

- Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat

No Leads - Product Outline

- Near Chip-Scale Package Footprint Improves PCB

Efficiency and Is Thinner in Profile

Applications

•WLAN Cards

- PCMCIA, Cardbus32, MiniPCI Cards

- Compact Flash Cards

• Liberty Chipset

• Hand-Held Instruments

Related Literature

• TB363 - Guidelines for Handling and Processing Moisture

Sensitive Surface Mount Devices (SMDs)

• TB389 - PCB Land Pattern Design and Surface Mount

Guidelines for QFN Packages

Ordering Information

ISL6413IR

-40 to 85

24 Ld QFN L24.4x4B

Data Sheet

October 2003

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

1-888-INTERSIL or 321-724-7143

Copyright © Intersil Americas Inc. 2003. All Rights Reserved

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