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參數(shù)資料
| 型號： | LP3923TLX-VB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA30 |
| 封裝： | 3 X 2.50 MM, MICRO SMD-30 |
| 文件頁數(shù)： | 1/32頁 |
| 文件大?。?/td> | 1718K |
| 代理商： | LP3923TLX-VB |
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LP3923
April 13, 2010
Cellular Phone Power Management Unit
General Description
The LP3923 is a fully Integrated Power Management Unit
(PMU) designed for CDMA cellular phones.
The LP3923 PMU contains a fully integrated Li-Ion battery
charger with power FET and over-voltage-protection (OVP),
one Buck regulator, 8 low-noise low-dropout (LDO) voltage
regulators, and a high-speed serial interface to program on/
off conditions and output voltages of individual regulators, and
to read status information of the PMU. Two LILO (low-input,
low-output) type LDOs with separate power input provide an
application option for pre-regulated high efficient power man-
agement for longer battery life.
The Li-Ion charger can safely charge and maintain a single
cell Li-Ion battery operating from an AC adapter. The charger
integrates a power FET, a reverse current blocking diode, a
sense resistor with current monitor output, and requires only
a few external components. Charging is thermally regulated
to obtain the most efficient charging rate for a given ambient
temperature.
A built-in Over-Voltage Protection (OVP) circuit at the charger
inputs protects the PMU from input voltages up to +28V, elim-
inating the need for any external protection circuitry.
Buck regulator has an automatic switch to PFM mode at low
load conditions providing very good efficiency at low output
currents. An external divider circuitry provides user defined
buck output voltage.
A-type LDO regulators provide excellent PSRR and very low
noise, 10 V typ., ideally suited for supplying voltage to RF
and other analog sections.
Features
■ Integrated Li-Ion battery charger with power FET, thermal
regulation and 28V OVP
■ Six Low-Noise LDOs, two LILO LDOs
3 x 300 mA
4 x 150 mA
1 x 80 mA
■ One high efficiency Synchronous Magnetic Buck
Regulators, I
OUT 700 mA
High efficiency PFM mode @low I
OUT
Auto Mode PFM/PWM switch
Low inductance 2.2 H @ 2 MHz clock
■ I2C-compatible interface for controlling LDO outputs and
charger operation
■ Thermal Shutdown with Early Warning Alarm
■ Under-Voltage Lockout
■ 30-bump 3.0 x 2.5 mm micro SMD package
Key Specifications
■ 50 mA to 1200 mA Charging Current
■ 3.0V to 5.5V Input Voltage Range
■ 135 mV typ. Dropout Voltage @ 300 mA LDOs
2% (typ.) Output Voltage accuracy on LDOs
■ 700 mA (typ.) buck regulator
Applications
■ Cellular Handsets
System Diagram
30058601
2010 National Semiconductor Corporation
300586
www.national.com
LP3923
Cellular
Phone
Power
Management
Unit
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LP3923TL-VB | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA30 |
| LP3923TLX-VC | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA30 |
| LP3923TL-VI | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA30 |
| LP3946ILD | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14 |
| LP3972SQXA413 | 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC40 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP3923TLX-VB/NOPB | 功能描述:PMIC 解決方案 RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| LP3923TLX-VC | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Cellular Phone Power Management Unit |
| LP3923TLX-VC/NOPB | 功能描述:PMIC 解決方案 RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| LP3923TLX-VI | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Cellular Phone Power Management Unit |
| LP3923TLX-VI/NOPB | 功能描述:PMIC 解決方案 RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
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