LP3981-12B5F POWER [Lowpower Semiconductor inc], LP3981-12B5F Datasheet

LP3981-12B5F

Manufacturer Part Number

LP3981-12B5F

Description

300mA,Ultra-low noise, Small Package Ultra-Fast CMOS LDO Regulator

Manufacturer

POWER [Lowpower Semiconductor inc]

Datasheet

1.LP3981-12B5F.pdf (8 pages)

Current page: 1 of 8
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General Description

The LP3981 is designed for portable RF and

wireless applications with demanding performance

and space requirements. The LP3981 performance

is optimized for battery-powered systems to deliver

ultra low noise and low quiescent current. A noise

bypass pin is available for further reduction of

output noise. Regulator ground current increases

only slightly in dropout, further prolonging the

battery life. The LP3981 also works with low-ESR

ceramic capacitors, reducing the amount of board

space necessary for power applications, critical in

hand-held wireless devices. The LP3981 consumes

less than 0.01µA in shutdown mode and has fast

turn-on time less than 50µs. The other features

include ultra low dropout voltage, high output

accuracy, current limiting protection, and high

ripple rejection ratio. Available in the 5-lead of

SOT23-5 packages.

Ordering Information

LP3981 - □ □ □ □

Typical Application Circuit

LP3981 – 01 Ver. 1.1 Datasheet

Vin

SHDN

Output Voltage Type

12: 1.2V

15: 1.5V

18: 1.8V

25: 2.5V

28: 2.8V

30: 3.0V

33: 3.3V

50: 5.0V

□

Package Type

B5: SOT23-5

OUT

Feb.-2008

F: Pb-Free

300mA,Ultra-low noise, Small Package

Preliminary Datasheet

Vout

1uF

Ultra-Fast CMOS LDO Regulator

Features

Applications

Marking Information

Please see website.

Pin Configurations

Ultra-Low-Noise for RF Application

2V- 6.5V Input Voltage Range

Low Dropout : 220mV @ 300mA

1.2V, 1.5V, 1.8V, 2.5V, 2.8V 3.0V and 3.3V Fixed

300mA Output Current, 550mA Peak Current

High PSSR:-73dB at 1KHz 

< 0.01uA Standby Current When Shutdown

Available in SOT23-5 Package 　

TTL-Logic-Controlled Shutdown Input

Ultra-Fast Response in Line/Load transient

Current Limiting and Thermal Shutdown

Protection

Quick start-up (typically 50uS)

Portable Media Players/MP3 players

Cellular and Smart mobile phone

LCD

DSC Sensor

Wireless Card

SOT-25(Top View)

Page 1 of 8

LP3981

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LP3981-12B5F Summary of contents

Page 1

... General Description The LP3981 is designed for portable RF and wireless applications with demanding performance and space requirements. The LP3981 performance is optimized for battery-powered systems to deliver ultra low noise and low quiescent current. A noise bypass pin is available for further reduction of output noise. Regulator ground current increases only slightly in dropout, further prolonging the battery life ...

Page 2

... HBM (Human Body Mode) ---------------------------------------------------------------------------------------------------2kV MM(Machine-Mode)-----------------------------------------------------------------------------------------------------------200V Recommended Operating Conditions Supply Input Voltage------------------------------------------------------------------------------------------------2.5V to 5.5V EN Input Voltage ------------------------------------------------------------------------------------------------------0V to 5.5V Operation Junction Temperature Range -----------------------------------------------------------------−40°C to 125°C Operation Ambient TemperatureRange--------------------------------------------------------------------−40°C to 85°C LP3981 – 01 Ver. 1.1 Datasheet Preliminary Datasheet Feb.-2008 LP3981 Page ...

Page 3

... EN Input Bias Current Logic-Low Voltage EN Threshold Logic-High Voltage Output Noise Voltage Power Supply f = 100Hz f = 10kHz Rejection Rate Thermal Shutdown Temperature LP3981 – 01 Ver. 1.1 Datasheet Preliminary Datasheet Symbol Test Conditions ΔVOUT IOUT = 1mA Iout VEN=VIN,VIN>2.5V ILIM RLOAD = 1Ω IQ VEN ≥ 1.2V, IOUT = 0mA IOUT = 200mA, VOUT > ...

Page 4

... Typical Operating Characteristics LP3981 – 01 Ver. 1.1 Datasheet Preliminary Datasheet Feb.-2008 LP3981 Page ...

Page 5

... LP3981 – 01 Ver. 1.1 Datasheet Preliminary Datasheet Feb.-2008 LP3981 Page ...

Page 6

... PSRR. The output capacitor should be located not more than 0.5 inch from the VOUT pin of the LP3981 and returned to a clean analog ground. LP3981 – 01 Ver. 1.1 Datasheet Feb.-2008 ...

Page 7

... TA is the ambient temperature and the θJA is the junction to ambient thermal resistance. For recommended operating conditions specification of LP3981, where TJ(MAX) is the maximum junction temperature of the die (125°C) and TA is the maximum ambient temperature. The junction to ambient thermal resistance (θ ...

Page 8

... Packaging Information LP3981 – 01 Ver. 1.1 Datasheet Preliminary Datasheet Feb.-2008 LP3981 Page ...

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