LP38798 Datasheet, PDF (1/23 Pages) Texas Instruments – LP38798-ADJ High PSRR, Ultra Low Noise, 800 mA Linear Voltage Regulator for RF/Analog Circuits

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LP38798
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SNOSCT6A – MARCH 2013 – REVISED MAY 2013
LP38798-ADJ High PSRR, Ultra Low Noise, 800 mA Linear Voltage Regulator for
RF/Analog Circuits
FEATURES
1
• Ultra-Low Output Noise: 5 µV_RMS (10Hz to 100
kHz)
• High PSRR: 90 dB at 10 kHz, 60 dB at 100 kHz
• Wide Operating Input Voltage Range: 3.0V to
20V
• ±1.0% Output Voltage Initial Accuracy (T_J =
25°C)
• Very Low Dropout : 200 mV (Typical) at 800mA
• Stable with Ceramic or Tantalum Output
Capacitors
• Excellent Line and Load Transient Response
• Current Limit and Over-Temperature
Protection
APPLICATIONS
• RF and VCO Power
• Wireless LAN Devices
• Wireless Cable Modems
• Low Noise Post-Regulation
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 (3.0V to 20V) making it well suited for
many post-regulation applications.
The LP38798-ADJ is available in a 12-Lead WSON
package (4.0 x 4.0 x 0.8 mm) with Thermal Pad.
Typical Application Circuit
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)
LP38798-ADJ
4
CP
9
SET
5
EN
6
GND(CP)
DAP
8
FB
7
GND
V_OUT
C_OUT
R1
R2
GND
*.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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 © 2013, Texas Instruments Incorporated