LP3923TL-VI+ National Semiconductor, LP3923TL-VI+ Datasheet

LP3923TL-VI+

Manufacturer Part Number

LP3923TL-VI+

Description

Manufacturer

National Semiconductor

Datasheet

1.LP3923TL-VI.pdf (32 pages)

Specifications of LP3923TL-VI+

Notes

NEW

Date_code

10+

Current page: 1 of 32
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Cellular Phone Power Management Unit

General Description

The LP3923 is a fully Integrated Power Management Unit

(PMU) designed for CDMA cellular phones.

The LP3923 PMU contains a fully integrated Li-Ion battery

charger with power FET and over-voltage-protection (OVP),

one Buck regulator, 8 low-noise low-dropout (LDO) voltage

regulators, and a high-speed serial interface to program on/

off conditions and output voltages of individual regulators, and

to read status information of the PMU. Two LILO (low-input,

low-output) type LDOs with separate power input provide an

application option for pre-regulated high efficient power man-

agement for longer battery life.

The Li-Ion charger can safely charge and maintain a single

cell Li-Ion battery operating from an AC adapter. The charger

integrates a power FET, a reverse current blocking diode, a

sense resistor with current monitor output, and requires only

a few external components. Charging is thermally regulated

to obtain the most efficient charging rate for a given ambient

temperature.

A built-in Over-Voltage Protection (OVP) circuit at the charger

inputs protects the PMU from input voltages up to +28V, elim-

inating the need for any external protection circuitry.

Buck regulator has an automatic switch to PFM mode at low

load conditions providing very good efficiency at low output

currents. An external divider circuitry provides user defined

buck output voltage.

A-type LDO regulators provide excellent PSRR and very low

noise, 10 µV typ., ideally suited for supplying voltage to RF

and other analog sections.

System Diagram

300586

LP3923

Features

■

Key Specifications

■

Applications

■

Integrated Li-Ion battery charger with power FET, thermal

regulation and 28V OVP

Six Low-Noise LDOs, two LILO LDOs

3 x 300 mA

4 x 150 mA

1 x 80 mA

One high efficiency Synchronous Magnetic Buck

Regulators, I

High efficiency PFM mode @low I

Auto Mode PFM/PWM switch

Low inductance 2.2 µH @ 2 MHz clock

charger operation

Thermal Shutdown with Early Warning Alarm

Under-Voltage Lockout

30-bump 3.0 x 2.5 mm micro SMD package

50 mA to 1200 mA Charging Current

3.0V to 5.5V Input Voltage Range

135 mV typ. Dropout Voltage @ 300 mA LDOs

2% (typ.) Output Voltage accuracy on LDOs

700 mA (typ.) buck regulator

Cellular Handsets

C-compatible interface for controlling LDO outputs and

OUT

700 mA

OUT

30058601

April 13, 2010

www.national.com

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