LT3009_15 Datasheet, PDF (1/20 Pages) Linear Technology – 3A IQ, 20mA Low Dropout Linear Regulators

LT3009 Series
3µA I_Q, 20mA
Low Dropout Linear Regulators
FEATURES
n _{Ultralow Quiescent Current: 3μA}
n _{Input Voltage Range: 1.6V to 20V}
n _{Output Current: 20mA}
n _{Dropout Voltage: 280mV}
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}
(1μF minimum)
n _{Shutdown Current: <1μA}
n _{Current Limit Protection}
n _{Reverse-Battery Protection}
n _{Thermal Limit Protection}
n _{8-Lead SC70 and 2mm × 2mm DFN Packages}
APPLICATIONS
n _{Low Current Battery-Powered Systems}
n _{Keep-Alive Power Supplies}
n _{Remote Monitoring}
Utility Meters
Hotel Door Locks
DESCRIPTION
The LT^®3009 Series are micropower, low dropout voltage
(LDO) linear regulators. The devices supply 20mA output
current with a dropout voltage of 280mV. 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 LT3009 regulators optimize stability and transient
response with low ESR ceramic capacitors, requiring a
minimum of only 1μF. 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 LT3009 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 as an adjustable device with an output voltage range
down to the 600mV reference. The LT3009 is available in
the 6-lead DFN and 8-lead SC70 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
3.75V TO
20V
IN
OUT
1μF
LT3009-3.3
SHDN
GND
V_OUT
3.3V
1μF ^20mA
3009 TA01a
Dropout Voltage/Quiescent Current
500
5.0
I_LOAD = 20mA
450
4.5
400
4.0
350
300
250 ^IQ
3.5
DROPOUT
VOLTAGE 3.0
2.5
200
2.0
150
1.5
100
1.0
50
0.5
0
–50 –25
0
0 25 50 75 100 125 150
TEMPERATURE (°C)
3009 TA01b
3009fd
1