FN8678 Rev 1.00

Page 1 of 2

October 3, 2014

FN8678

Rev 1.00

October 3, 2014

ISL91134

High Efficiency 1.8A Boost Regulator With Input-to-Output Bypass

DATA SHORT

To request the full datasheet, please visit www.intersil.com/products/isl91134

The ISL91134 is an integrated boost switching regulator for

battery powered applications. The device provides a power

supply solution for products using a one cell Li-ion or

Li-polymer battery.

The device is capable of delivering up to 1.8A output current

only 108µA in Boost Mode and 45µA in Forced Bypass Mode,

which significantly reduces the standby consumption.

The ISL91134 offers a Bypass Mode operation where the

output is directly connected to the input through a 38mΩ

MOSFET to allow a significantly lower dropout voltage. The

Bypass Mode can be entered by an external command or by

auto bypass. The Forced Bypass Mode allows the output

voltage to operate close to the input voltage and improves the

efficiency under these conditions.

The ISL91134 is designed to support a fixed output voltage of

5V. A voltage select pin is available for each output variant to

scale up the output voltage by a small offset to compensate

the load transient droop.

The ISL91134 requires only an inductor and a few external

components to operate. The 2.5MHz switching frequency

further reduces the size of external components.

The ISL91134 is available in a 16 bump, 0.4mm pitch,

1.78mmx1.78mm WLCSP.

Features

• Input voltage range: 2.35V to 5.4V

• High efficiency: up to 96%

• 108µA quiescent current minimizes standby consumption in

Boost Mode, 45µA in Forced Bypass Mode

• 2.5MHz switching frequency minimizes external component

size

• Forced Bypass or Auto Bypass Modes with a 38mΩ switch

• PFM mode at light-load currents

• Fully protected for overcurrent, over-temperature and

undervoltage

• Load disconnect when disabled

• Small 1.78mmx1.78mm WLCSP

Applications

• Smartphones and tablet PCs

• Wireless communication devices

• 2G/3G/4G RF power amplifiers

•USB OTG power source

Related Literature

• AN1957, “ISL91134 Evaluation Board User Guide”

FIGURE 1. TYPICAL APPLICATION

2.35V TO 5.4V

UP TO 1.8A

ISL91134IIQ

VIN

EN

LX

VOUT

22µF

GND

PGND

22µF

PG

RESET

BYPS

AUTO BYPASS

FORCED BYPASS

0.47µH

VSEL

80

82

84

86

88

90

92

94

96

98

100

0.001

0.01

0.1

1