FN8680 Rev 0.00

Page 1 of 2

September 5, 2014

FN8680

Rev 0.00

September 5, 2014

ISL91133

High Efficiency 2.3A Boost Regulator With Input-to-Output Bypass

DATA SHORT

To request the full datasheet, please visit www.intersil.com/products/isl91133

The ISL91133 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 2.3A output current

current is only 108μA in Boost Mode and 45μA in Forced

Bypass Mode, which significantly reduces the standby

consumption.

The ISL91133 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 ISL91133 is designed to support 6 fixed output voltages

ranging from 3.15V to 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 ISL91133 requires only an inductor and a few external

components to operate. The 2.5MHz switching frequency

further reduces the size of external components.

The ISL91133 is available in a 16 bump, 0.4mm pitch,

1.78mmx1.78mm WLCSP.

Features

• Input voltage range: 2.35V to 5.4V

600µs, T = 4.6ms)

• 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

• AN1958 “ISL91133 Evaluation Board User Guide”

FIGURE 1. TYPICAL APPLICATION

2.35V TO 5.4V

UP TO 2.3A

ISL91133IIMZ

VIN

EN

LX

VOUT

2x22µF

GND

PGND

22µF

PG

RESET

BYPS

AUTO BYPASS

FORCED BYPASS

0.47µH

VSEL

70

72

74

76

78

80

82

84

86

88

90

92

94

96

98

100

0.001

0.01

0.1

1