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LP3991TLX-2.0/NOPB
300mA Linear Voltage Regulator for Digital Applications
LP3991OUT
1 PF
GND
VIN
Load
COUT*
CIN
* For VOUT = 1.3 V or less,
4.7 PF
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LP3991SNVS296J –DECEMBER 2006–REVISED JUNE 2016
LP3991 300-mA LDO for Digital Applications Features Input Voltage From 1.65Vto4V Output Voltage From 0.8Vto3V 1% Accuracyat Room Temperature 125-mV Dropoutat 300-mA Load 50-µA Quiescent Currentat 1-mA Load Inrush Current Controlledto 600 mA PSRR65 dBat1 kHz 100-µs Start-Up Timefor 1.5-V VOUT Stable With Ceramic Capacitorsas Smallas 0402 Thermal-Overload and Short-Circuit Protection
Applications Post DC-DC Regulator Battery Operated Devices Hand-Held Information Appliances
DescriptionOperating froma minimum input voltageof 1.65V,
the LP3991 LDO has been designedto provide fixed
stable output voltages for load currentsupto 300 mA.
This deviceis suitable where accurate low voltages
are required from low input voltage sources andis
therefore suitable for post regulation of switched
mode regulators. In such applications, significant
improvements in performance and EMI can be
realized, with little reductionin overall efficiency. The
LP3991 provides fixed outputsas lowas 1.2V froma
wide input range from 1.65Vto4V Using the enable
(EN) pin, the device may be controlledto providea
shutdown state,in which negligible supply currentis
drawn.
The LP3991is designed to be stable with space-
saving ceramic capacitors as small as 0402 case
size.
Performanceis specified fora –40°C to +125°C
junction temperature range. For output voltage
options, contact your local Texas Instruments sales
office.
Device Information(1)(1) Forall available packages, see the orderable addendumat
the endofthe datasheet.
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Typical Application Circuit
