Datasheet > RT9941

RT9941

更新时间： 2024-11-08 12:23:43

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	711K
描述
Power Management ICs for Handheld Device

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RT9941 数据手册

RT9941

Power Management ICs for Handheld Device

General Description

Features

^zCharger

The RT9941 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 & 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.

Input 18V from PWR_IN Pin

` 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.

` Buck 1 for DDR Memory, Adjustable Voltage and

600mA Output Current

` Buck 2 for PDN with 25mV/step I²C Adjustable

800mA 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 Pre-Core. I²C Adiustable,

Sync. with Buck2, Default ON

` LDO4 : 2.5V/50mA for AVDD of USB, ADC, TSC,

Default ON

The LDO linear regulators provide high power supply

rejection rate and have only 45μV_RMSof output noises for

100Hz to 10kHz frequency range to power noise sensitive

RF sections.

The RT9941 is available in WQFN-40L 5x5 package.

` LDO5 : 3.3V/50mA for AVDD of USB, Default ON

` Minimize the External Component Counts

z Other

Ordering Information

RT9941

Package Type

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

Lead Plating System

` System Reset

` Low Voltage Detector

` I²C Compatible Interface

G : Green (Halogen Free and Pb Free)

Note :

` Power ON Timing Control

z RoHS Compliant and Halogen Free

Richtek products are :

` RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

Applications

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

z GPS and PDA

z HandheldDevices

DS9941-01 April 2011

www.richtek.com

12 3 4 5 6 7...33

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