LT3008_15 Datasheet, PDF (1/20 Pages) Linear Technology – 3A IQ, 20mA, 45V Low Dropout Linear Regulators

LT3008 Series
3µA I_Q, 20mA, 45V
Low Dropout Linear Regulators
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 _{Fixed Output Voltages: 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V}
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 series are micropower, low dropout voltage
(LDO) linear regulators. The devices supply 20mA output
current with a dropout voltage of 300mV. No-load quiescent
current 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 regulators optimize stability and transient
response with low ESR ceramic capacitors, requiring a
minimum of only 2.2μF. The regulators do 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 series are ideal for applications that require
moderate output drive capability coupled with ultralow
standby power consumption. The device is available in
fixed output voltages of 1.2V, 1.5V, 1.8V, 2.5V, 3.3V and
5V, and an adjustable version with an output voltage range
of 0.6V to 44.5V. The LT3008 is available in the thermally
enhanced 6-lead DFN and 8-lead TSOT-23 packages.
L, LT, LTC, LTM, Linear Technology and the Linear logo 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
IN
OUT
1μF
LT3008-3.3
SHDN SENSE
GND
V_OUT
3.3V
2.2μF ^20mA
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
3008fc
1