LT3011
50mA, 3V to 80V Low
Dropout Micropower Linear
Regulator with PWRGD
DESCRIPTION
FEATURES
The LT®3011 is a high voltage, micropower, low dropout
linearregulator.Thedeviceiscapableofsupplying50mAof
output current with a dropout voltage of 300mV. Designed
for use in battery-powered high voltage systems, the low
quiescent current (46μA operating and 1μA in shutdown)
is well controlled in dropout, making the LT3011 an ideal
choice.
n
Wide Input Voltage Range: 3V to 80V
n
Low Quiescent Current: 46μA
n
Low Dropout Voltage: 300mV
Output Current: 50mA
n
n
PWRGD Flag with Programmable Delay
n
No Protection Diodes Needed
n
Adjustable Output from 1.24V to 60V
n
1μA Quiescent Current in Shutdown
The LT3011 includes a PWRGD flag to indicate output
regulation. The delay between regulated output level and
flag indication is programmable with a single capacitor.
The LT3011 also has the ability to operate with very small
output capacitors; it is stable with only 1μF on the output.
Smallceramiccapacitorscanbeusedwithouttheaddition
of any series resistance (ESR) as is common with other
regulators. Internal protection circuitry includes reverse-
battery protection, current limiting, thermal limiting, and
reverse current protection.
n
Stable with 1μF Output Capacitor
n
Stable with Ceramic, Tantalum, and Aluminum
Capacitors
Reverse-Battery Protection
n
n
No Reverse Current Flow from Output to Input
n
Thermal Limiting
n
Thermally Enhanced 12-Lead MSOP and
10-Pin (3mm × 3mm) DFN Packages
APPLICATIONS
The LT3011 features an adjustable output with a 1.24V
reference voltage. The device is available in the thermally
enhanced 12-lead MSOP and the low profile (0.75mm)
10-pin (3mm × 3mm) DFN package, both providing excel-
lent thermal characteristics.
n
Low Current High Voltage Regulators
n
Regulator for Battery-Powered Systems
Telecom Applications
n
n
Automotive Applications
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Dropout Voltage
5V Supply with Shutdown
350
300
V
OUT
IN
OUT
ADJ
5V
50mA
V
LT3011
IN
750k
249k
250
200
150
100
50
1.6M
3V TO
80V
1μF
1μF
SHDN
PWRGD
GND
C
T
POWER GOOD
1000pF
3011 TA01
V
OUTPUT
OFF
ON
SHDN
<0.3V
>2.0V
0
0
10
20
30
40
50
OUTPUT CURRENT (mA)
3011 TA02
3011f
1