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参数资料
| 型号： | LP3917RLX-QL |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 电源管理 |
| 英文描述： | CDMA Cellular Phone Power Management Unit |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA49 |
| 封装： | 3.50 X 3.50 MM, SMD-49 |
| 文件页数： | 1/6页 |
| 文件大小： | 178K |
| 代理商： | LP3917RLX-QL |
December 2006
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
■ 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 V noise on LDO's
■ 800/600 mA Buck regulators with 3% (typ)
Accuracy and up to 90% efficiency
Features
■ Two high efficiency Synchronous Magnetic Buck
Regulators, I
OUT 800 mA and 600 mA
High efficiency PFM mode @ low I
OUT
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
Applications
■ CDMA Handsets
Please contact NSC Sales for a full datasheet for the device.
System Diagram
20176201
2007 National Semiconductor Corporation
201762
www.national.com
LP3917
CDMA
Cellular
Phone
Power
Management
Unit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LP3917RLX-QL/NOPB | 功能描述:PMIC 解决方案 RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| LP3917RLX-S | 制造商:NSC 制造商全称:National Semiconductor 功能描述:CDMA Cellular Phone Power Management Unit |
| LP3917RLX-S/NOPB | 功能描述:PMIC 解决方案 RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| LP3918 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Battery Charge Management and Regulator Unit |
| LP3918TL | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
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