LP3991_15 Datasheet, PDF (1/25 Pages) Texas Instruments – LP3991 300-mA Linear Voltage Regulator for Digital Applications

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LP3991
SNVS296I – DECEMBER 2006 – REVISED AUGUST 2015
LP3991 300-mA Linear Voltage Regulator for Digital Applications
1 Features
•1 Input Voltage From 1.65 V to 4 V
• Output Voltage From 0.8 V to 3 V
• 1% Accuracy at Room Temperature
• 125-mV Dropout at 300-mA Load
• 50-µA Quiescent Current at 1-mA Load
• Inrush Current Controlled to 600 mA
• PSRR 65 dB at 1 kHz
• 100-µs Start-Up Time for 1.5-V V_OUT
• Stable with Ceramic Capacitors as Small as 0402
• Thermal-Overload and Short-Circuit Protection
2 Applications
• Post DC-DC Regulator
• Battery Operated Devices
• Hand-Held Information Appliances
3 Description
Operating from a minimum input voltage of 1.65 V,
the LP3991 regulator has been designed to provide
fixed stable output voltages for load currents up to
300 mA. 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 provides fixed outputs as low as 1.2 V
from a wide input range from 1.65 V to 4 V Using the
enable (EN) 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, contact your local Texas Instruments sales
office.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (MAX)
LP3991
DSBGA (4)
1.46 mm x 0.99 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
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Typical Application Circuit
LP3991
V_IN
IN
B2
C_IN
1 PF
OUT
B1
4.7 PF
C_OUT*
V_EN
EN
A2
GND
Load
A1
* For VOUT = 1.3 V or less,
COUT may be reduced to 2.2 PF.
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.