LT3030
Dual 750mA/250mA
Low Dropout, Low Noise,
Micropower Linear Regulator
FeaTures
DescripTion
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Output Current: 750mA/250mA
TheLT®3030isadual,micropower,lownoise,lowdropout
linear regulator. The device operates with either common
or independent input supplies for each channel, over a
1.7V to 20V input voltage range. Output 1/Output 2 supply
750mA/250mArespectivelywithatypicaldropoutvoltage
of 300mV. With an external 10nF bypass capacitor, output
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Low Dropout Voltage: 300mV
Low Noise: 20μV
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(10Hz to 100kHz)
RMS
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Low Quiescent Current: 120μA/75μA
Wide Input Voltage Range: 1.7V to 20V
Adjustable Output: 1.220V Reference Voltage
Shutdown Quiescent Current: <1μA
Stable with 10µF/3.3µF Minimum Output Capacitor
Stable with Ceramic, Tantalum or Aluminum
Electrolytic Capacitors
noise is only 20μV
over a 10Hz to 100kHz bandwidth.
RMS
Designed for use in battery-powered systems, the low
120μA/75μA quiescent current makes it an ideal choice.
In shutdown, quiescent current drops to less than 1μA.
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Precision Threshold for Shutdown Logic or UVLO Function Shutdown control is independent for each channel and
PWRGD Flag for each Output
Reverse Battery and Reverse Output-to-Input
Protection
Current Limit with Foldback and Thermal Shutdown
Thermally Enhanced 20-Lead TSSOP and
28-Lead (4mm × 5mm) QFN Packages
its precision logic threshold allows for voltage lockout
functionality. The LT3030 includes a PWRGD flag for each
channel to indicate output regulation.
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TheLT3030optimizesstabilityandtransientresponsewith
low ESR ceramic output capacitors, requiring a minimum
of only 10μF/3.3μF.
applicaTions
Internal circuitry provides reverse-battery protection,
reverse-current protection, current limiting with foldback
and thermal shutdown with hysteresis. The adjustable
output voltage device has a 1.220V reference voltage.
The LT3030 is offered in the thermally enhanced 20-lead
TSSOP and 28-lead, low profile (4mm × 5mm × 0.75mm)
QFN packages.
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General Purpose Linear Regulator
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Battery-Powered Systems
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Microprocessor Core/Logic Supplies
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Post Regulator for Switching Supplies
Tracking/Sequencing Power Supplies
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L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
Typical applicaTion
2.5VIN to 1.8V/1.5V Application
Dropout Voltage vs Load Current
500
V
IN
2.5V
V
OUT1
T
= 25°C
IN1
OUT1
J
1.8V
450
400
350
300
250
200
150
100
50
10nF
10µF
750mA
3.3µF
IN2
LT3030
113k
1%
SHDN1
SHDN2
BYP1
ADJ1
237k
1%
OUT2
1M
1M
PWRGD1
PWRGD2
OUT1
V
OUT2
OUT2
1.5V
10nF
3.3µF
250mA
54.9k
1%
BYP2
ADJ2
0
GND
0
75 150 225 300 375 450 525 600 675 750
237k
1%
3030 TA01a
OUTPUT CURRENT (mA)
3030 TA01b
3030fa
1
For more information www.linear.com/LT3030