TPS22949

TPS22949A

www.ti.com

SLVS908C – FEBRUARY 2009 – REVISED JANUARY 2010

CURRENT-LIMITED LOAD SWITCH WITH LOW NOISE REGULATION CAPABILITY

Check for Samples: TPS22949, TPS22949A

1

FEATURES

DESCRIPTION

•

Integrated Current Limiter

–

Input Voltage Range: 1.62 V to 4.5 V

The TPS22949 and TPS22949A are devices that

provides

protection

to

systems

and

loads

in

–

Low ON-Resistance

high-current

conditions.

The

device

contains

a

–

500-m

Ω current-limited P-channel MOSFET that can

–

operate over an input voltage range of 1.62 V to

4.5 V as well as a low-dropout (LDO) regulator with a

–

fixed output voltage of 1.8 V.

–

The switch is controlled by an on/off input (EN1),

–

Integrated 100-mA Minimum Current Limit

which

is

capable

of

interfacing

directly

with

–

Undervoltage Lockout

low-voltage control signals. When the switch current

–

Fast-Current Limit Response Time

reaches

the

maximum

limit,

the

TPS22949/TPS22949A

operates

in

a

–

Integrated Fault Blanking and Auto Restart

constant-current mode to prohibit excessive currents

•

Stable Without Current Limiter Output

from

causing

damage.

If

the

constant

current

Capacitor (TPS22949A Only)

condition still persists after 12 ms, these devices shut

•

Integrated Low-Noise RF LDO

off the switch and pull the fault signal pin (OC) low.

The

TPS22949/TPS22949A

has

an

auto-restart

–

Input Voltage Range: 1.62 V to 4.5 V

feature that turns the switch on again after 70 ms if

–

Low Noise: 50

μVrms (10 Hz to 100 kHz)

the EN1 pin is still active.

–

The

output

of

the

current

limiter

is

internally

–

Fast Start-Up Time: 130

μs

connected to a RF low-dropout (LDO) regulator that

–

offers good ac performance with very low ground

current, good power-supply rejection ratio (PSRR),

–

Integrated Output Discharge

low noise, fast start-up, and excellent line and load

–

Stable With 2.2-

μF Output Capacitor

transient response. The output of the regulator is

•

1.8-V Compatible Control Input Threshold

stable with ceramic capacitors. This LDO uses a

precision voltage reference and feedback loop to

•

ESD Performance Tested Per JESD 22

achieve overall accuracy of 2% over all load, line,

–

3500-V Human-Body Model

process, and temperature variations.

(A114-B, Class II)

The

TPS22949A

integrates

additional

internal

–

1000-V Charged-Device Model

circuitry that increases the current limit of the switch

(C101)

during the power-up sequence. This feature allows

•

Tiny 8-Terminal YZP Package (1.9 mm ×

the

TPS22949A

to

operate

without

a

storage

0.9 mm, 0.5-mm Pitch, 0.5-mm Height) and

capacitor at the input of the LDO.

SON-8 (DRG) 3.0 mm × 3.0 mm

The TPS22949 and TPS22949A are available in a

space-saving 8-terminal WCSP (YZP) or in a 8-pin

APPLICATIONS

SON package (DRG). Both are characterized for

•

Fingerprint Module Protection

operation over the free-air temperature range of

•

Portable Consumer Electronics

–40°C to 85°C.

•

Smart Phone

•

Notebooks

•

Control Access Systems

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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2009–2010, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.