LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
1
3021fc
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
500mA, Low Voltage,
Very Low Dropout
Linear Regulator
The LT
®
3021 is a very low dropout voltage (VLDO™) lin-
ear regulator that operates from input supplies down to
0.9V. This device supplies 500mA of output current with
a typical dropout voltage of 160mV. The LT3021 is ideal
for low input voltage to low output voltage applications,
providing comparable electrical effi ciency to that of a
switching regulator.
The LT3021 regulator optimizes stability and transient
response with low ESR, ceramic output capacitors as small
as 3.3μF. Other LT3021 features include 0.05% typical line
regulation and 0.2% typical load regulation. In shutdown,
quiescent current typically drops to 3μA.
Internal protection circuitry includes reverse-battery pro-
tection, current limiting, thermal limiting with hysteresis,
and reverse-current protection. The LT3021 is available as
an adjustable output device with an output range down to
the 200mV reference. Three fi xed output voltages, 1.2V,
1.5V and 1.8V, are also available.
The LT3021 regulator is available in the low profi le
(0.75mm) 16-pin (5mm × 5mm) DFN package with ex-
posed pad and the 8-lead SO package.
1.8V to 1.5V, 500mA VLDO Regulator
n
V
IN
Range: 0.9V to 10V
n
Dropout Voltage: 160mV Typical
n
Output Current: 500mA
n
Adjustable Output (V
REF
= V
OUT(MIN)
= 200mV)
n
Fixed Output Voltages: 1.2V, 1.5V, 1.8V
n
Stable with Low ESR, Ceramic Output Capacitors
(3.3μF Minimum)
n
0.2% Load Regulation from 0mA to 500mA
n
Quiescent Current: 120μA (Typ)
n
3μA Typical Quiescent Current in Shutdown
n
Current Limit Protection
n
Reverse-Battery Protection
n
No Reverse Current
n
Thermal Limiting with Hysteresis
n
16-Pin DFN (5mm × 5mm) and 8-Lead
SO Packages
n
Low Current Regulators
n
Battery-Powered Systems
n
Cellular Phones
n
Pagers
n
Wireless Modems
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. VLDO is
a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
Minimum Input Voltage
IN
SHDN
SENSE
3.3μF
3021 TA01
OUT
V
IN
1.8V
GND
LT3021-1.5
V
OUT
1.5V
500mA
3.3μF
TEMPERATURE (°C)
–50
MINIMUM INPUT VOLTAGE (V)
1.1
1.0
0.9
0.8
0.6
0.7
0.5
0.4
0.3
0.2
0.1
0
3021 TA02
250–25 50 75
125100
I
L
= 500mA
