LP3917RL-QL+ National Semiconductor, LP3917RL-QL+ Datasheet

LP3917RL-QL+

Manufacturer Part Number

LP3917RL-QL+

Description

Manufacturer

National Semiconductor

Datasheet

1.LP3917RL-QL.pdf (6 pages)

Specifications of LP3917RL-QL+

Notes

NEW

Date_code

10+

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LP3917RL-QL+LP3917RL-QL NOPB

Manufacturer:

Quantity:

5 928

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LP3917

CDMA Cellular Phone Power Management Unit

General Description

LP3917 is a complete Power Management Unit designed for

CDMA cellular phones. LP3917 PMU contains 9 low noise low

dropout voltage regulators, 2 buck regulators, an USB

Transceiver, two comparators and a high speed serial inter-

face to program on/off conditions and output voltages of

individual regulators, and to read status information of the

PMU.

Buck regulators have an automatic switch to PFM mode at

low load conditions allowing very good efficiency also at low

output currents.

LDO regulators provide very low noise, 35 uV typ, ideally suit-

ed for supplying voltage to RF section.

Two comparators can be used for detecting external acces-

sories like ear plug etc.

LP3917 can use interrupt for alerting BB processor of status

changes instead of using inefficient status polling.

Key Specifications

■

System Diagram

3.0V to 5.5V Input Voltage Range

170 mV typ Dropout Voltage on LDO's @ 300 mA

2% (typ) Output Voltage accuracy on LDO's

35 µV noise on LDO's

800/600 mA Buck regulators with 3% (typ)

Accuracy and up to 90% efficiency

201762

Features

■

Applications

■

Please contact NSC Sales for a full datasheet for the device.

Two high efficiency Synchronous Magnetic Buck

Regulators, I

High efficiency PFM mode @ low I

Auto Mode PFM/PWM switch

Low inductance 2.2 uH @ 2 MHz clock

9 Low Noise LDO's

3 x 300 mA

5 x 150 mA

1 x 80 mA

SW controllable LDO outputs

USB 2.0 compatible Transceiver (12 Mbps)

Thermal Shutdown with Early Warning Alarm

Very low Sleep mode current

Battery Voltage Monitor output

Interrupt Request for reducing SW polling

Ultra small 3.5x3.5 mm Micro SMDxt 49 bump package

CDMA Handsets

OUT

800 mA and 600 mA

20176201

OUT

December 2006

www.national.com

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