LT3030 Datasheet, PDF (1/20 Pages) Linear Technology – Dual 750mA/250mA Low Dropout, Low Noise, Micropower Linear Regulator

LT3030
Dual 750mA/250mA
Low Dropout, Low Noise,
Micropower Linear Regulator
Features
Description
n _{Output Current: 750mA/250mA}
n _{Low Dropout Voltage: 300mV}
n _{Low Noise: 20μVRMS (10Hz to 100kHz)}
n _{Low Quiescent Current: 120μA/75μA}
n _{Wide Input Voltage Range: 1.8V to 20V}
n _{Adjustable Output: 1.220V Reference Voltage}
n _{Shutdown Quiescent Current: <1μA}
n _{Stable with 10µF/3.3µF Minimum Output Capacitor}
n _{Stable with Ceramic, Tantalum or Aluminum}
Electrolytic Capacitors
n _{Precision Threshold for Shutdown Logic or UVLO Function}
n _{PWRGD Flag for each Output}
n _{Reverse Battery and Reverse Output-to-Input}
Protection
n _{Current Limit with Foldback and Thermal Shutdown}
n _{Thermally Enhanced 20-Lead TSSOP and}
28-Lead (4mm × 5mm) QFN Packages
Applications
n _{General Purpose Linear Regulator}
n _{Battery-Powered Systems}
n _{Microprocessor Core/Logic Supplies}
n _{Post Regulator for Switching Supplies}
n _{Tracking/Sequencing Power Supplies}
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.
The LT^®3030 is a dual, micropower, low noise, low dropout
linear regulator. The device operates with either common
or independent input supplies for each channel, over a
1.8V to 20V input voltage range. Output 1/Output 2 supply
750mA/250mA respectively with a typical dropout voltage
of 300mV. With an external 10nF bypass capacitor, output
noise is only 20μV_RMS over a 10Hz to 100kHz bandwidth.
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.
Shutdown control is independent for each channel and
its precision logic threshold allows for voltage lockout
functionality. The LT3030 includes a PWRGD flag for each
channel to indicate output regulation.
The LT3030 optimizes stability and transient response with
low ESR ceramic output capacitors, requiring a minimum
of only 10μF/3.3μF.
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.
Typical Application
2.5V_IN to 1.8V/1.5V Application
V_IN
2.5V
3.3µF
IN1
OUT1
IN2 _LT3030
SHDN1
BYP1
10nF
113k
1%
SHDN2
ADJ1
1M 1M
237k
1%
PWRGD1
PWRGD2
OUT2
GND
BYP2
ADJ2
3030 TA01a
10nF
54.9k
1%
237k
1%
10µF
V_OUT1
1.8V
750mA
V_OUT2
1.5V
3.3µF _250mA
For more information www.linear.com/3030
Dropout Voltage vs Load Current
500
450 ^{TJ = 25°C}
400
350
300
OUT2
250
200
OUT1
150
100
50
0
0 75 150 225 300 375 450 525 600 675 750
OUTPUT CURRENT (mA)
3030 TA01b
3030f
1