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LP3927ILQX-AJ Datasheet

  • LP3927ILQX-AJ

  • Cellular/PCS System Power Management IC

  • 16頁

  • NSC

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LP3927 Cellular/PCS System Power Management IC
August 2002
LP3927
Cellular/PCS System Power Management IC
General Description
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鈥檚), 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.
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鈥檚 are optimized for low noise and
high isolation.
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.
Key Specifications
3.0V to 5.5V Input Voltage Range
Two 200 mA, Two 150 mA and One 100 mA LDO鈥檚
100 mV typ Dropout Voltage
@
I
MAX
150 mA General-Purpose Open-drain programmable
current sink for back light LED
n
Low Voltage Rail to Rail Input/Output Operational
Amplifier
n
28 pin LLP package
n
n
n
n
Applications
n
n
n
n
Cellular/PCS handsets
PDA鈥檚, Palmtops, and portable terminals
Single鈥揅ell Li+ Systems
2- or 3- Cell NiMH, NiCd or Alkaline System
Typical Application Circuit
20037901
V
DD1
, V
DD2
and V
DD3
must be tied together externally. Collectively called V
DD
.
漏 2002 National Semiconductor Corporation
DS200379
www.national.com

LP3927ILQX-AJ 產品屬性

  • 4,500

  • 集成電路 (IC)

  • PMIC - 電源管理 - 專用

  • -

  • 手持/移動設備

  • 5µA

  • 3 V ~ 5.5 V

  • -40°C ~ 85°C

  • 表面貼裝

  • 28-WFQFN 裸露焊盤

  • 28-LLP-EP（5x5）

  • 帶卷 (TR)

  • LP3927ILQX-AJ/NOPB

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