Datasheet > LP3905

LP3905

更新时间： 2024-11-15 11:14:15

品牌	Logo	应用领域
德州仪器 - TI		集成电源管理电路
页数	文件大小	规格书
23页	1009K
描述
面向低功耗手持式应用的电源 IC (PMIC)

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LP3905 数据手册

LP3905

www.ti.com

SNVS374D –JUNE 2006–REVISED MAY 2013

LP3905 Power Management Unit For Low Power Handheld Applications

Check for Samples: LP3905

FEATURES

KEY SPECIFICATIONS

Buck Regulators

•

Two Buck Regulators for Powering High

Current Processor Functions or Peripheral

Devices

•

Fixed and Adjustable Voltage Options, Range

1.0V to 3.3V⁽¹⁾

•

Two Linear Regulators for Powering Internal

Processor Functions and I/Os

•

Up to 90% Efficiency

Auto-Switching PFM-PWM Mode and Fixed

PWM Mode

One Enable Pin for Buck1 and Linear

Regulators 1 and 2

•

2MHz PWM Fixed Switching Frequency (Typ)

600mA Output Current

•

Separate Enable Pin for Buck2

Thermal and Current Overload Protection

Small 14–Pin WSON Package (4x4mmx0.8mm)

±4% Output Voltage Accuracy Over Temp

Internal SoftStart

2.2µH Inductor, 10µF Input and Output Caps

APPLICATIONS

Linear Regulators

•

Baseband Processors

Peripheral Processor (Video, Audio)

I/O Power

•

Output Options in the Range 1.5V to 3.3V⁽¹⁾

13.5µV_rmsOutput Voltage Noise

PSRR - 70dB @ 1kHz

FPGA Power

±3% Output Voltage Accuracy Over Full Line

and Load Regulation

DESCRIPTION

•

0mA to 150mA Output Current

C_in= 1.0µF, C_out= 0.47µF for 100mA O/P

C_in= 1.0µF, C_out= 1.0µF for 150mA O/P

80mV Dropout Voltage

LP3905 is a multi-functional Power Management Unit,

optimized for low power handheld applications. This

device integrates two 600mA DC-DC buck regulators

and two 150mA linear regulators. Fixed and

adjustable buck output versions are available. The

LP3905 additionally features two enable pins for the

device output control and is offered in an WSON

package.

(1) Fixed output voltage devices can be customized to fit system

requirements. Please contact Texas Instruments Sales Office.

Typical Application Circuit

LP3905

Enable 1

EN2

TGND

LDO2

Vin2

FB2

GND_B2

SW2

LDO2

Output

Buck2

Output

0.47 mF

1.0 mF

2.2 mH

10 mF

VSupply

Vin1

VSupply

LDO1

Output

Buck1

Output

LDO1

GND

EN1

SW1

0.47 mF

10 mF

GND_B1

FB1

Enable 2

SGND

BUCK GND

LDO GND

Figure 1. Typical Application Circuit – 14-Pin WSON Package

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...23

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与LP3905相关器件

型号	品牌	获取价格	描述	数据表
LP3905SD-00	NSC	获取价格	Power Management Unit For Low Power Handheld Applications
LP3905SD-30	NSC	获取价格	Power Management Unit For Low Power Handheld Applications
LP3905SD-A3	NSC	获取价格	Power Management Unit For Low Power Handheld Applications
LP3905SD-A3/NOPB	TI	获取价格	面向低功耗手持式应用的电源 IC (PMIC) \| NHL \| 14 \| -40 to 8
LP3905SDX-00	NSC	获取价格	Power Management Unit For Low Power Handheld Applications
LP3905SDX-30	NSC	获取价格	Power Management Unit For Low Power Handheld Applications
LP3905SDX-A3	NSC	获取价格	Power Management Unit For Low Power Handheld Applications
LP3905SDX-A3/NOPB	TI	获取价格	Power Management IC (PMIC) For Low Power Handheld Applications 14-WSON -40 to 85
LP3906	NSC	获取价格	Dual High-Current Step-Down DC/DC and Dual Linear Regulator with I2C Compatible Interface
LP3906	TI	获取价格	Dual High-Current Step-Down DC/DC and Dual Linear Regulator with I2C ompatible

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