LT3008 Datasheet, PDF (1/16 Pages) Linear Technology – 3μA IQ, 20mA, 45V Low Dropout Linear Regulator

LT3008
3µA I_Q, 20mA, 45V
Low Dropout Linear Regulator
FEATURES
n _{Ultralow Quiescent Current: 3μA}
n _{Input Voltage Range: 2.0V to 45V}
n _{Output Current: 20mA}
n _{Dropout Voltage: 300mV}
n _{Adjustable Output (VADJ = VOUT(MIN) = 600mV)}
n _{Output Tolerance: ±2% Over Load, Line and}
Temperature
n _{Stable with Low ESR, Ceramic Output Capacitors}
(2.2μF minimum)
n _{Shutdown Current: <1μA}
n _{Current Limit Protection}
n _{Reverse-Battery Protection}
n _{Thermal Limit Protection}
n _{TSOT-23 and 2mm × 2mm DFN Packages}
APPLICATIONS
n _Automotive
n _{Low Current Battery-Powered Systems}
n _{Keep-Alive Power Supplies}
n _{Remote Monitoring}
n _{Utility Meters}
n _{Low Power Industrial Applications}
DESCRIPTION
The LT^®3008 is a micropower, low dropout voltage (LDO)
linear regulator. The device supplies 20mA output current
with a dropout voltage of 300mV. No-load quiescent cur-
rent is 3μA. Ground pin current remains at less than 5% of
output current as load increases. In shutdown, quiescent
current is less than 1μA.
The LT3008 regulator optimizes stability and transient
response with low ESR ceramic capacitors, requiring a
minimum of only 2.2μF. The LT3008 does not require
the addition of ESR as is common with other regulators.
Internal protection circuitry includes current limiting,
thermal limiting, reverse-battery protection and reverse-
current protection.
The LT3008 is ideal for applications that require moderate
output drive capability coupled with ultralow standby power
consumption. The device is available as an adjustable
device with an output voltage range down to the 600mV
reference. The LT3008 is available in the 6-lead DFN and
8-lead TSOT-23 packages.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
3.3V, 20mA Supply with Shutdown
V_IN
3.8V TO
45V
V_OUT
IN
OUT
3.3V
1μF
LT3008
2.8M
1%
2.2μF ^20mA
SHDN ADJ
GND
619k
1%
3008 TA01a
Dropout Voltage/Quiescent Current
500
I_LOAD = 20mA
450
400
6
DROPOUT
VOLTAGE
5
350
4
300
250
I_Q
3
200
2
150
100
1
50
0
–50 –25
0
0 25 50 75 100 125 150
TEMPERATURE (°C)
3008 TA01b
3008f
1