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DESCRIPTIO
V
IN
Range: 0.9V to 10V
Dropout Voltage: 160mV Typical
Output Current: 500mA
Adjustable Output (V
REF
= V
OUT(MIN)
= 200mV)
Fixed Output Voltages: 1.2V, 1.5V, 1.8V
Stable with Low ESR, Ceramic Output Capacitors
(3.3碌F Minimum)
0.2% Load Regulation from 0mA to 500mA
Quiescent Current: 120碌A (Typ)
3碌A Typical Quiescent Current in Shutdown
Current Limit Protection
Reverse-Battery Protection
No Reverse Current
Thermal Limiting with Hysteresis
16-Pin DFN (5mm
脳
5mm) and 8-Lead
SO Packages
The LT
廬
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 3.3碌F. Other LT3021 features include 0.05%
typical line regulation and 0.2% typical load regulation. In
shutdown, quiescent current typically drops to 3碌A.
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
脳
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.
APPLICATIO S
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Low Current Regulators
Battery-Powered Systems
Cellular Phones
Pagers
Wireless Modems
TYPICAL APPLICATIO
V
IN
1.8V
3.3碌F
1.8V to 1.5V, 500mA VLDO Regulator
V
OUT
1.5V
500mA
MINIMUM INPUT VOLTAGE (V)
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
I
L
= 500mA
IN
OUT
LT3021-1.5
3.3碌F
SHDN
SENSE
GND
3021 TA01
0
鈥?0
鈥?5
U
Minimum Input Voltage
0
25
50
75
TEMPERATURE (擄C)
100
125
3021 TA02
U
U
3021fa
1
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