LT3021 Datasheet, PDF (1/16 Pages) Linear Technology – 500mA, Low Voltage, Very Low Dropout Linear Regulator

LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
500mA, Low Voltage,
Very Low Dropout
Linear Regulator
FEATURES
■ _{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
U
APPLICATIO S
■ _{Low Current Regulators}
■ _{Battery-Powered Systems}
■ _{Cellular Phones}
■ _Pagers
■ _{Wireless Modems}
TYPICAL APPLICATIO
1.8V to 1.5V, 500mA VLDO Regulator
V_IN
1.8V
IN
OUT
3.3µF
LT3021-1.5
SHDN SENSE
GND
3021 TA01
V_OUT
1.5V
3.3µF ^500mA
DESCRIPTIO
The LT^®3021 is a very low dropout voltage (VLDO^TM) 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 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 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 ex-
posed pad and the 8-lead SO package.
, LTC and LT 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
1.1 _{IL = 500mA}
1.0
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
3021fa
1