ISL9187 Intersil Corporation, ISL9187 Datasheet

ISL9187

Manufacturer Part Number

ISL9187

Description

(ISL9107 / ISL9108) 1.5A 1.6MHz Low Quiescent Current High Efficiency Synchronous Buck Regulator

Manufacturer

Intersil Corporation

Datasheet

1.ISL9187.pdf (12 pages)

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1.5A 1.6MHz Low Quiescent Current High

Efficiency Synchronous Buck Regulator

ISL9107 and ISL9108 are 1.6MHz synchronous step-down

regulators with integrated power switches capable of

delivering 1.5A output current, which is ideal for powering

low-voltage microprocessors in compact devices such as

PDAs and cellular phones. These devices are optimized for

generating low output voltages down to 0.8V. The supply

voltage range is from 2.7V to 5.5V allowing for the use of a

single Li+ cell, three NiMH cells or a regulated 5V input.

1.6MHz pulse-width modulation (PWM) switching frequency

allows using small external components. They have flexible

operation mode selection of forced PWM mode and Skip

(Low I

highest light load efficiency to maximize battery life.

The ISL9107 and ISL9108 integrate a pair of low

ON-resistance P-Channel and N-Channel MOSFETs to

maximize efficiency and minimize external component

count.

The ISL9107 offers a typical 215ms Power-Good (PG) timer

when powered up. The timer output can be reset by RSI.

When shutdown, ISL9107 and ISL9108 discharge the output

capacitor. Other features include internal digital soft-start,

enable for power sequence, overcurrent protection, and

thermal shutdown.

The ISL9107 and ISL9108 are offered in 8 Ld 2mmx3mm

DFN package with 0.9mm typical height. The complete

converter can occupy less than 1cm

Ordering Information

ISL9107IRZ-T 107

ISL9108IRZ-T 108

*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.

NUMBER

(Note)

PART

) mode with typical 17μA quiescent current for

MARKING

PART

-40 to +85 8 Ld 2x3 DFN

RANGE

TEMP.

(°C)

Data Sheet

area.

PACKAGE

(Pb-Free)

L8.2x3

DWG. #

PKG.

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

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

Features

• Integrated Synchronous Buck Regulator with up to 95%

• 2.7V to 5.5V Supply Voltage

• 1.5A Guaranteed Output Current

• 17μA Quiescent Supply Current in Skip (Low I

• Selectable Forced PWM Mode and Skip Mode

• Less Than 1µA Logic Controlled Shutdown Current

• 100% Maximum Duty Cycle for Lowest Dropout

• Discharge Output Capacitor when Shutdown

• Internal Digital Soft-Start

• Enable, Peak Current Limiting, Short Circuit Protection

• Over-Temperature Protection

• Power-Good Function (for ISL9107 only)

• 8 Ld 2mmx3mm DFN

• Pb-Free (RoHS Compliant)

Applications

• Single Li-Ion Battery-Powered Equipment

• DSP Core Power

• PDAs and Palmtops

Pinouts

December 21, 2007

Efficiency

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

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

MODE

VIN

(8 LD 2X3 DFN)

TOP VIEW

ISL9107, ISL9108

ISL9107

ISL9108

GND

RSI

GND

FN6612.0

) Mode

Related parts for ISL9187

ISL9187 Summary of contents

Page 1

Low Quiescent Current High Efficiency Synchronous Buck Regulator ISL9107 and ISL9108 are 1.6MHz synchronous step-down regulators with integrated power switches capable of delivering 1.5A output current, which is ideal for powering low-voltage microprocessors in compact devices such ...

Page 2

Absolute Maximum Ratings VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 3

Electrical Specifications PARAMETER PG (NOTE 1) Output Low Voltage Delay Time PG Pin Leakage Current Minimum Supply Voltage for Valid PG Signal Internal PGOOD Low Rising Threshold Internal PGOOD Low Falling Threshold Internal PGOOD High Rising Threshold www.DataSheet4U.com Internal PGOOD ...

Page 4

Typical Operating Performance 100 3. 500 LOAD CURRENT (mA) www.DataSheet4U.com FIGURE 1. EFFICIENY vs LOAD CURRENT (V 100 EFFICIENCY @ 4. ...

Page 5

Typical Operating Performance 5V/DIV V SW 1V/DIV V OUT 1A/DIV www.DataSheet4U.com 5V/DIV FIGURE 6. SOFT-START ( 1.5A) OUT 5V/DIV V 50mV/DIV 200mA/DIV FIGURE 8. STEADY-STATE IN SKIP MODE ( 1.6V, I OUT OUT ...

Page 6

Typical Operating Performance 5V/DIV V 100mV/DIV 1A/DIV www.DataSheet4U.com FIGURE 12. LOAD TRANSIENT TEST (MODE = 1.6V 0.01A~1A 5V/DIV 100mV/DIV 1A/DIV FIGURE 14. LOAD TRANSIENT TEST (MODE = 1.6V ...

Page 7

Typical Applications INPUT 2.7V TO 5.5V C1 10µF www.DataSheet4U.com INPUT 2.7V TO 5.5V C1 10µF PARTS DESCRIPTION L Inductor C1 Input capacitor C2 Output capacitor C3 Capacitor R1(ISL9107) Resistor R2, R3 Resistor ISL9107, ISL9108 SW VIN EN GND R1 ISL9107 ...

Page 8

Block Diagram SOFT- START SHUTDOWN 0.8V EN BANDGAP www.DataSheet4U.com RSI* + VREF5 SCP FB + VREF3 + VREF4 PG* PGOOD DELAY *Note: Only applies to ISL9107. ISL9107, ISL9108 OSCILLATOR + EAMP + COMP SLOPE + COMP *Note FIGURE 17. FUNCTIONAL ...

Page 9

Theory of Operation The ISL9107 and ISL9108 are step-down switching regulators optimized for battery-powered handheld applications. The regulators operate at typical 1.6MHz fixed switching frequency under heavy load condition to allow small external inductor and capacitors to be used for ...

Page 10

Mode Selection The MODE pin is provided on ISL9107 and ISL9108 to select the operation mode. When it is driven to logic low or ground, the regulator operates in forced PWM mode. Under forced PWM mode, the device remains at ...

Page 11

The rising edge of the PG output is delayed by 215ms (typical) from the time the power-good signal is issued. This function is provided on ISL9107 only. Applications Information Inductor and Output Capacitor Selection To achieve better steady state and ...

Page 12

... Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use ...

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