LT3011 Datasheet, PDF (1/16 Pages) Linear Technology – 50mA, 3V to 80V Low Dropout Micropower Linear Regulator with PWRGD

FEATURES
n _{Wide Input Voltage Range: 3V to 80V}
n _{Low Quiescent Current: 46μA}
n _{Low Dropout Voltage: 300mV}
n _{Output Current: 50mA}
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}
n _{Stable with 1μF Output Capacitor}
n _{Stable with Ceramic, Tantalum, and Aluminum}
Capacitors
n _{Reverse-Battery Protection}
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
n _{Low Current High Voltage Regulators}
n _{Regulator for Battery-Powered Systems}
n _{Telecom Applications}
n _{Automotive Applications}
LT3011
50mA, 3V to 80V Low
Dropout Micropower Linear
Regulator with PWRGD
DESCRIPTION
The LT^®3011 is a high voltage, micropower, low dropout
linear regulator. The device is capable of supplying 50mA of
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.
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.
Small ceramic capacitors can be used without the addition
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.
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.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
5V Supply with Shutdown
V_IN
3V TO
80V
V_SHDN
<0.3V
>2.0V
1μF ^1.6M
POWER GOOD
OUTPUT
OFF
ON
IN
OUT
LT3011
750k
SHDN _ADJ
PWRGD
GND C_T
249k
1000pF
V_OUT
5V
50mA
1μF
3011 TA01
350
300
250
200
150
100
50
0
0
Dropout Voltage
10
20
30
40
OUTPUT CURRENT (mA)
50
3011 TA02
3011f
1