LT3024_1 Datasheet, PDF (1/20 Pages) Linear Technology – Dual 100mA/500mA Low Dropout, Low Noise,Micropower Regulator

LT3024
Dual 100mA/500mA
Low Dropout, Low Noise,
Micropower Regulator
FEATURES
n _{Low Noise: 20μVRMS (10Hz to 100kHz)}
n _{Low Quiescent Current: 30μA/Output}
n _{Wide Input Voltage Range: 1.8V to 20V}
n _{Output Current: 100mA/500mA}
n _{Very Low Shutdown Current: <0.1μA}
n _{Low Dropout Voltage: 300mV at 100mA/500mA}
n _{Adjustable Outputs from 1.22V to 20V}
n _{Stable with 1μF/3.3μF Output Capacitor}
n _{Stable with Aluminum, Tantalum or}
Ceramic Capacitors
n _{Reverse Battery Protected}
n _{No Reverse Current}
n _{No Protection Diodes Needed}
n _{Overcurrent and Overtemperature Protected}
n _{Thermally Enhanced 16-Lead TSSOP and 12-Lead}
(4mm × 3mm) DFN Packages
APPLICATIONS
n _{Cellular Phones}
n _Pagers
n _{Battery-Powered Systems}
n _{Frequency Synthesizers}
n _{Wireless Modems}
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
DESCRIPTION
The LT^®3024 is a dual, micropower, low noise, low dropout
regulator. With an external 0.01μF bypass capacitor, output
noise drops to 20μV_RMS over a 10Hz to 100kHz bandwidth.
Designed for use in battery-powered systems, the low 30μA
quiescent current per output makes it an ideal choice. In
shutdown, quiescent current drops to less than 0.1μA.
Shutdown control is independent for each output, allowing
for flexibility in power management. The device is capable
of operating over an input voltage range of 1.8V to 20V. The
device can supply 100mA of output current from Output
2 with a dropout voltage of 300mV. Output 1 can supply
500mA of output current with a dropout voltage of 300mV.
Quiescent current is well controlled in dropout.
The LT3024 regulator is stable with output capacitors as
low as 1μF for the 100mA output and 3.3μF for the 500mA
output. Small ceramic capacitors can be used without the
series resistance required by other regulators.
Internal protection circuitry includes reverse-battery
protection, current limiting, thermal limiting and reverse
current protection. The device is available as an adjust-
able device with a 1.22V reference voltage. The LT3024
regulator is available in the thermally enhanced 16-lead
TSSOP and 12-lead, low profile (4mm × 3mm × 0.75mm)
DFN packages.
TYPICAL APPLICATION
3.3V/2.5V Low Noise Regulators
V_IN
3.7V TO
20V
IN
OUT1
SHDN1
1μF
SHDN2 BYP1
ADJ1
LT3024
OUT2
BYP2
ADJ2
GND
0.01μF _422k
3.3V AT 500mA
10μF ^{20μVRMS NOISE}
249k
0.01μF _261k
2.5V AT 100mA
20μV_RMS NOISE
10μF
249k
3024 TA01a
10Hz to 100kHz Output Noise
V_OUT
100μV/DIV
20μV_RMS
3024 TA01b
3024fa
1