5A LOW DROPOUT VOLTAGE REGULATOR (Adjustable & Fixed)
LM1084
SOT-223 PKG (FRONT VIEW)
FEATURES
● Low Dropout Voltage 500mV at 5A Output Current
● Fast Transient Response
● 0.015% Line Regulation
PIN FUNCTION
1. Adj/Gnd
2. Vout
● 0.1% Load Regulation
● Internal Thermal and Current Limiting
● Adjustable or Fixed Output Voltage(1.5, 2.5, 2.85, 3.0, 3.3, 5.0V)
● Surface Mount Package SOT-223 & TO-263 (D2 Package)
● 100% Thermal Limit Burn-in
3. Vin
1
2
3
TO-263 (D2 PKG, FRONT VIEW)
APPLICATIONS
● Battery Charger
PIN FUNCTION
1. Adj/Gnd
2. Vout
● Adjustable Power Supplies
● Constant Current Regulators
● Portable Instrumentation
3. Vin
● High Efficiency Linear Power Supplies
● High Efficiency "Green" Computer Systems
● SMPS Post-Regulator
● Power PC Supplies
● Powering VGA & Sound Card
1
2
3
ORDERING INFORMATION
Device & Marking
LM1084S-XX
Package
SOT 223
LM1084T-XX
TO263 (D2)
(XX=Vout=1.5V, 2.5V, 2.85V, 3.0V, 3.3V, 5.0V
DESCRIPTION
Adjustable= AD)
The LM1084 is a low dropout three terminal regulator with 5A output current capability.
The output voltage is adjustable with the use of a resistor divider. Dropout is guaranteed at a maximum
of 500 mV at maximum output current.
It's low dropout voltage and fast transient response make it ideal for low voltage microprocessor
applications. Internal current and thermal limiting provides protection against any overload condition
that would create excessive junction temperature.
TEST & TYPICAL APPLICATION CIRCUIT
2
3
VIN
5V
VOUT
LM1084
3.33V
VREF=VOUT-VADJ=1.25V(Typ.)
VOUT=VREFx(1+RF2/RF1)+IADJxRF2
IADJ=55㎂(Typ.)
RF1
124Ω
1%
VREF
+
ADJ
1
C1
10㎌
C2
10㎌
RF2
205Ω
1%
(1) C1 Needed if device is far away
from filter capacitors.
(2) C2 Required for stability
Adjustable Voltage Regulator
HTC
1