Datasheet > RT9945

RT9945

更新时间： 2022-03-19 20:05:39

品牌	Logo	应用领域
立锜 - RICHTEK		手持设备
页数	文件大小	规格书
33页	686K
描述
Power Management ICs for Handheld Device

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RT9945 数据手册

RT9945

Power Management ICs for Handheld Device

General Description

Features

^zCharger

The RT9945 is a complete power management IC (PMIC)

for handheld device platform. This PMIC contains a fully

integrated linear charger for a single cell Lithium Ion battery,

five LDO linear regulators and two high efficiency buck

converters, a comparator, a reset and an I²C serial interface

to program one buck and one regulator output voltages as

well as power on timing control for complete flexibility.

` Adapter/USB & Battery Two Input with Auto Power

Dynamic Path.

` PWR_IN LDO Support Continuous 1.5A, Peak 2A

Current

` 4.5V to 5.5V Operation Voltage Range with Max.

18V Input Voltage

` Switch Well for LDO and Charger Power MOSFET

` Set Charge Current by ISETA Pin

` Charge Status Indicator

The linear charger integrates LDO, MOSFET pass element,

and thermal-regulation circuitry. The proprietary thermal-

regulation circuitry limits the die temperature when fast

charging or while exposed to high ambient temperatures,

allowing maximum charging current without damaging the

IC.

` Interrupt for PWR_IN Plug In/Out, Time Out and

Charger Done.

` Battery Temperature Monitoring

z Hysteretic Buck

The two step-down converters are optimized for small size

inductor and high efficiency applications. They utilize a

proprietary hysteretic PWM control scheme that switches

with nearly fixed frequency and is adjustable, allowing the

customer to trade some efficiency for smaller external

component, as desired. The output current is guaranteed

up to 600mA, while quiescent current is a low 40μA (typ).

` Buck 1 for Memory, Adjustable Voltage and 600mA

Output Current

` Buck 2 for Core voltage with 25mV/step I²C

Adjustable, 600mA Output Current

` Max. Efficiency Up to 90%

z LDO

` LDO1 : 3.3V/500mA for I/O, Default ON

` LDO2 : 1.2V/80mA for PLL, Default ON

` LDO3 : 1.2V/80mA for VDD Alive.

` LDO4 : 2.5V/50mA, Default OFF

` LDO5 : 3.3V/50mA, Default OFF

` Minimize the External Component Counts

z Other

The LDO linear regulators provide high power supply

rejection rate and have only 45uV_RMSof output noises for

100Hz to 10kHz frequency range to power noise sensitive

RF sections.

The RT9945 is available in WQFN-40L 5x5 package.

` Low Voltage Detector

` I²C Compatible Interface

Ordering Information

RT9945

` Power ON Timing Control

Package Type

QW : WQFN-40L 5x5 (W-Type)

Lead Plating System

z RoHS Compliant and Halogen Free

Applications

z GPS and PND

G : Green (Halogen Free and Pb Free)

Note :

Richtek products are :

z PDA and Smart Phones

z HandheldDevices

` RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

` Suitable for use in SnPb or Pb-free soldering processes.

DS9945-01 April 2011

www.richtek.com

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