LP3905系列介绍资料

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LP3905

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面向低功耗手持式应用的电源 IC (PMIC)

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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.

Two Buck Regulators for Powering High Current Processor Functions or Peripheral Devices
Two Linear Regulators for Powering Internal Processor Functions and I/Os
One Enable Pin for Buck1 and Linear Regulators 1 and 2
Separate Enable Pin for Buck2
Thermal and Current Overload Protection
Small 14–Pin WSON Package (4x4mmx0.8mm)

Key Specifications

Buck Regulators

Fixed and Adjustable Voltage Options, Range 1.0V to 3.3V⁽¹⁾
Up to 90% Efficiency
Auto-Switching PFM-PWM Mode and Fixed PWM Mode
2MHz PWM Fixed Switching Frequency (Typ)
600mA Output Current
±4% Output Voltage Accuracy Over Temp
Internal SoftStart
2.2µH Inductor, 10µF Input and Output Caps

Linear Regulators

Output Options in the Range 1.5V to 3.3V
13.5µV_rms Output Voltage Noise
PSRR - 70dB @ 1kHz
±3% Output Voltage Accuracy Over Full Line and Load Regulation
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

Regulated outputs (#)	4
Configurability	Factory programmable, Hardware configurable
Vin (min) (V)	3
Vin (max) (V)	5.5
Iout (max) (A)	0.6
Features	Enable pin, Overcurrent protection, Thermal shutdown
Step-up DC/DC converter	0
Step-down DC/DC converter	2
Step-down DC/DC controller	0
Step-up DC/DC controller	0
LDO	2
Iq (typ) (mA)	0.14
Rating	Catalog
Switching frequency (max) (kHz)	2000
Operating temperature range (°C)	-40 to 85
Shutdown current (ISD) (typ) (µA)	6.5
Switching frequency (typ) (kHz)	2000

WSON (NHL)

16 mm² 4 x 4

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LP3905

面向低功耗手持式应用的电源 IC (PMIC)

Key Specifications

4000-306-326