LP3991_14 Datasheet, PDF (1/20 Pages) Texas Instruments – 300mA Linear Voltage Regulator for Digital Applications

LP3991
www.ti.com
SNVS296G – DECEMBER 2006 – REVISED JANUARY 2011
LP3991 300mA Linear Voltage Regulator for Digital Applications
Check for Samples: LP3991
FEATURES
1
•2 Operation from 1.65V to 4.0V Input
• 1% accuracy at room temperature
• Output Voltage from 1.2V to 2.8V
• 125mV Dropout at 300mA load
• 50µA Quiescent Current at 1mA Load
• Inrush Current controlled to 600mA
• PSRR 65dB at 1kHz
• 100µs Start-Up time for 1.5V V_OUT
• Stable with Ceramic Capacitors as small as
0402
• Thermal-Overload and Short-Circuit Protection
APPLICATIONS
• Post DC/DC Regulator
• Battery Operated Devices
• Hand-Held Information Appliances
DESCRIPTION
Operating from a minimum input voltage of 1.65V, the LP3991 regulator has been designed to provide fixed
stable output voltages for load currents up to 300mA. This device is suitable where accurate, low voltages are
required from low input voltage sources and is therefore suitable for post regulation of switched mode regulators.
In such applications, significant improvements in performance and EMI can be realized, with little reduction in
overall efficiency. The LP3991 will provide fixed outputs as low as 1.2V from a wide input range of 1.65V to 4.0V
Using the enable pin, the device may be controlled to provide a shutdown state, in which negligible supply
current is drawn.
The LP3991 is designed to be stable with space saving ceramic capacitors as small as 0402 case size.
Performance is specified for a -40°C to 125°C junction temperature range.
For output voltage options please contact your local NSC sales office.
Package
4 pin micro SMD (0.963mm x 1.446mm)
Typical Application Circuit
LP3991
V_IN
V_IN
B2
1.0 PF
C_IN
V_{OUT B1}
C_OUT*
4.7 PF
V_EN
V_EN
A2
Gnd
A1
* For V_OUT = 1.3V or less, C_OUT
may be reduced to 2.2 PF.
Load
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006–2011, Texas Instruments Incorporated