LP3927

更新时间： 2024-11-14 23:16:47

品牌	Logo	应用领域
美国国家半导体 - NSC		过程控制系统 PCS 蜂窝
页数	文件大小	规格书
16页	323K
描述
Cellular/PCS System Power Management IC

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LP3927 数据手册

August 2002

LP3927

Cellular/PCS System Power Management IC

General Description

Key Specifications

n 3.0V to 5.5V Input Voltage Range

The LP3927 system power management IC is designed for

cellular/PCS handsets as well as other portable systems that

require intelligent power management. Each device contains

five low-dropout linear regulators (LDO’s), a reset timer, a

power-up control logic, a general-purpose open drain output

that can be used to light LEDs, and a CMOS rail-to-rail

input/output operational amplifier.

n Two 200 mA, Two 150 mA and One 100 mA LDO’s

n 100 mV typ Dropout Voltage I_MAX

n 150 mA General-Purpose Open-drain programmable

current sink for back light LED

n Low Voltage Rail to Rail Input/Output Operational

Amplifier

Each linear regulator features an extremely low dropout

voltage of 100 mV (typ) at maximum output current. LDO1

and LDO2 are powered on and off by either the KYBD or the

VEXT pin. LDO3, LDO4 and LDO5 each have its indepen-

dent enable pin. LDO1 and LDO4 are rated at 150 mA each,

LDO2 and LDO5 are rated at 200 mA each and LDO3 is

rated at 100 mA. All LDO’s are optimized for low noise and

high isolation.

n 28 pin LLP package

Applications

n Cellular/PCS handsets

n PDA’s, Palmtops, and portable terminals

n Single–Cell Li+ Systems

n 2- or 3- Cell NiMH, NiCd or Alkaline System

The open drain output current sink can be programmed up to

150 mA by using an external low cost resistor.

A single supply, low voltage operational amplifier has rail to

rail input and output with 600 kHz of gain-bandwidth product.

Typical Application Circuit

20037901

V_DD1, V_DD2and V_DD3must be tied together externally. Collectively called V_DD

DS200379

www.national.com

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与LP3927相关器件

型号	品牌	获取价格	描述	数据表
LP3927ILQ-AH	NSC	获取价格	Cellular/PCS System Power Management IC
LP3927ILQ-AH/NOPB	TI	获取价格	IC,POWER CONTROL/MANAGEMENT,LLCC,28PIN,PLASTIC
LP3927ILQ-AJ	NSC	获取价格	Cellular/PCS System Power Management IC
LP3927ILQ-AJ/NOPB	TI	获取价格	IC,POWER CONTROL/MANAGEMENT,LLCC,28PIN,PLASTIC
LP3927ILQ-AZ	NSC	获取价格	IC 1-CHANNEL POWER SUPPLY SUPPORT CKT, CQCC28, LLP-28, Power Management Circuit
LP3927ILQ-AZ/NOPB	TI	获取价格	Cellular/PCS System Power Management IC (PMIC) 28-WQFN -40 to 85
LP3927ILQX-AH	NSC	获取价格	Cellular/PCS System Power Management IC
LP3927ILQX-AH/NOPB	TI	获取价格	IC,POWER CONTROL/MANAGEMENT,LLCC,28PIN,PLASTIC
LP3927ILQX-AJ	TI	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, CQCC28, LLP-28
LP3927ILQX-AJ	NSC	获取价格	Cellular/PCS System Power Management IC