LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
500mA, Low Voltage,
Very Low Dropout
Linear Regulator
DESCRIPTION
FEATURES
n
n
n
n
n
n
n
n
n
n
n
n
n
n
VIN Range: 0.9V to 10V
Dropout Voltage: 160mV Typical
Output Current: 500mA
Adjustable Output (VREF = VOUT(MIN) = 200mV)
Fixed Output Voltages: 1.2V, 1.5V, 1.8V
Stable with Low ESR, Ceramic Output Capacitors
(3.3μF Minimum)
0.2% Load Regulation from 0mA to 500mA
Quiescent Current: 120μA (Typ)
3μA Typical Quiescent Current in Shutdown
Current Limit Protection
Reverse-Battery Protection
No Reverse Current
Thermal Limiting with Hysteresis
16-Pin DFN (5mm × 5mm) and 8-Lead
SO Packages
APPLICATIONS
n
n
n
n
n
Low Current Regulators
Battery-Powered Systems
Cellular Phones
Pagers
Wireless Modems
The LT®3021 is a very low dropout voltage (VLDO™) linear 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 efficiency 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 protection, 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 fixed output voltages, 1.2V,
1.5V and 1.8V, are also available.
The LT3021 regulator is available in the low profile
(0.75mm) 16-pin (5mm × 5mm) DFN package with exposed pad and the 8-lead SO package.
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.
TYPICAL APPLICATION
Minimum Input Voltage
1.1
1.8V to 1.5V, 500mA VLDO Regulator
VIN
1.8V
IN
3.3μF
OUT
LT3021-1.5
SHDN
3.3μF
SENSE
GND
3021 TA01
VOUT
1.5V
500mA
MINIMUM INPUT VOLTAGE (V)
1.0
IL = 500mA
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–50
–25
0
25
50
75
TEMPERATURE (°C)
100
125
3021 TA02
3021fc
1
