LP38798_15 Datasheet, PDF (1/27 Pages) Texas Instruments – LP38798 High PSRR, Ultra-Low-Noise, 800-mA Linear Voltage Regulator for RF/Analog Circuits

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LP38798
SNOSCT6B – MARCH 2013 – REVISED DECEMBER 2014
LP38798 High PSRR, Ultra-Low-Noise, 800-mA Linear Voltage Regulator
for RF/Analog Circuits
1 Features
•1 Wide Operating Input Voltage Range:
3 V to 20 V
• Ultra-Low Output Noise: 5 µV_RMS
(10 Hz to 100 kHz)
• High PSRR: 90 dB at 10 kHz, 60 dB at 100 kHz
• ±1% Output Voltage Initial Accuracy (T_J = 25°C)
• Very Low Dropout : 200 mV (Typical) at 800 mA
• Stable with Ceramic or Tantalum Output
Capacitors
• Excellent Line and Load Transient Response
• Current Limit and Overtemperature Protection
3 Description
The LP38798-ADJ is a high-performance linear
regulator capable of supplying 800 mA output current.
Designed to meet the requirements of sensitive
RF/Analog circuitry, the LP38798-ADJ implements a
novel linear topology on an advanced CMOS process
to deliver ultra-low output noise and high PSRR at
switching power supply frequencies. The
LP38798SD-ADJ is stable with both ceramic and
tantalum output capacitors and requires a minimum
output capacitance of only 1 µF for stability.
The LP38798-ADJ can operate over a wide input
voltage range (3 V to 20 V) making it well suited for
many post-regulation applications.
2 Applications
• RF and VCO Power
• Wireless LAN Devices
• Wireless Cable Modems
• Low Noise Post-Regulation
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
LP38798
WSON (12)
4.00 mm x 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
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Simplified Schematic
1
IN
12
OUT
V_IN
2
11
IN
OUT
V_EN
ON
OFF
+
C_IN
C_CP
GND
3
IN(CP)
10
OUT(FB)
4
CP
LP38798
9
SET
5
EN
6
GND(CP)
DAP
8
FB
7
GND
V_OUT
C_OUT
R1
R2
GND
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.