LP38869_15 Datasheet, PDF (1/23 Pages) Texas Instruments – 1A FlexCap, Low-Dropout Linear Regulator with 0.75% Accuracy

LP38869
www.ti.com
SNVS877B – AUGUST 2012 – REVISED APRIL 2013
LP38869 1A FlexCap, Low-Dropout Linear Regulator with 0.75% Accuracy
Check for Samples: LP38869
FEATURES
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•2 Operating Input Supply Range: +2.7V to + 5.5V
• Maximum Continuous Output Current: 1A
• Preset Output Voltage of 2.5V, or Adjustable
Output Voltage From 0.8V to 5.0V
• Pre-Set Output Initial V_OUT Tolerance ±0.5%
• Adjustable V_REF Tolerance of ±0.75%
• PSRR of 50dB at 100kHz
• Low 200 mV Dropout at 1A
• Typical 2 µA Supply Current in Shutdown
Mode
• Adjustable Soft-Start for Output Current
• Fold-Back Output Current Limit
• Stable With Ceramic, Tantalum, or Aluminum
Capacitors
• Stable With 1uF Input/Output Capacitors
• Thermal Shutdown
• 16-pin HTSSOP Package
APPLICATIONS
• DSA, FPGA and MCU Power Supply
• SMPS Post-Regulator
• Applications Requiring Sequencing
• Gibabit SERDES Termination Supply
DESCRIPTION
The LP38869 low-dropout linear regulator operates
with an input voltage supply from +2.7V to +5.5V
input, and delivers a specified 1A load current with a
low 200 mV dropout. The high 50 dB PSRR at 100
kHz results from a high gain control loop that also
yields excellent transient response. Coupled with a
high accuracy output voltage, ±0.75 % over
temperature, the LP38869 is an ideal power supply
for FPGAs, DSPs or MCUs. Output voltage is preset
at +2.5V, or may be adjustable between +0.8V to +5V
with an external resistor divider.
The LP38869 only needs 1 μF output capacitance for
stability. The FlexCap compensation allows the use of
any type of output capacitor, regardless of ESR.
Other features include: Soft-Start; delayed reset
output; low-power shutdown; short-circuit protection;
and thermal shutdown protection
Ground Pin Current: Typically less than 1 mA at 1A
load
Shutdown Mode: Typically 2 µA quiescent current
when the SHDN pin is pulled low.
Simplified Compensation: Stable with any type of
output capacitor.
Typical Application Circuit
V_IN
1 PF
IN
OUT
IN
OUT
IN
OUT
LP38869
IN
OUT
V_OUT
1 PF
ON-
OFF-
C_SS
RST
SHDN ^SET
SS
GND
DAP
RESET
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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.
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