1PF

BYPASS

LP3985

3(A1)

5(C1)

4(A3)

2(B2)

1PF

1(C3)

*

LP3985

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SNVS087AC – OCTOBER 2000 – REVISED MAY 2013

LP3985 Micropower, 150mA Low-Noise Ultra Low-Dropout CMOS Voltage Regulator

Check for Samples: LP3985

1

FEATURES

DESCRIPTION

The LP3985 is designed for portable and wireless

2

•

Miniature 5-I/O DSBGA and USON Package

applications with demanding performance and space

•

Logic Controlled Enable

requirements.

•

Stable with Ceramic and High Quality

The LP3985 is stable with a small 1µF ±30% ceramic

Tantalum Capacitors

or high-quality tantalum output capacitor. The DSBGA

•

Fast Turn-on

requires the smallest possible PC board area - the

total application circuit area can be less than 2.0mm x

•

Thermal Shutdown and Short-Circuit Current

2.5mm, a fraction of a 1206 case size.

Limit

The LP3985's performance is optimized for battery

APPLICATIONS

powered systems to deliver ultra low noise, extremely

low dropout voltage and low quiescent current.

•

CDMA Cellular Handsets

Regulator ground current increases only slightly in

•

Wideband CDMA Cellular Handsets

dropout, further prolonging the battery life.

•

GSM Cellular Handsets

An optional external bypass capacitor reduces the

•

Portable Information Appliances

output noise without slowing down the load transient

response. Fast startup time is achieved by utilizing an

KEY SPECIFICATIONS

internal power-on circuit that actively pre-charges the

bypass capacitor.

•

2.5 to 6.0V Input Range

Power supply rejection is better than 50dB at low

•

150mA Verified Output

frequencies and starts to roll off at 1kHz. High power

•

50dB PSRR at 1kHz @ VIN = VOUT + 0.2V

supply rejection is maintained down to low input

•

≤1.5μA Quiescent Current when Shut Down

voltage levels common to battery operated circuits.

•

Fast Turn-On time: 200

μs (typ.)

The device is ideal for mobile phone and similar

•

100mV Maximum Dropout with 150mA Load

battery powered wireless applications. It provides up

to 150mA, from a 2.5V to 6V input. The LP3985

•

30

μVrms Output Noise (typ.) Over 10Hz to

consumes less than 1.5µA in disable mode and has

100kHz

fast turn-on time less than 200µs.

•

−40 to +125°C Junction Temperature Range for

Operation

•

2.5V, 2.6V, 2.7V, 2.8V, 2.85V, 2.9V, 3.0V, 3.1V,

3.2V, 3.3V, 4.7V, 4.75V, 4.8V and 5.0V outputs

standard

Typical Application Circuit

Pin Numbers in parenthesis indicate DSBGA package.

* Optional Noise Reduction Capacitor.

Figure 1.

1

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2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2000–2013, 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.