LT3032
Dual 150mA
Positive/Negative Low Noise
Low Dropout Linear Regulator
DESCRIPTION
FEATURES
TheLT®3032isadual, lownoise, positiveandnegativelow
dropout voltage linear regulator. Each regulator delivers
up to 150mA with a typical 300mV dropout voltage. Each
regulator’s quiescent current is low (30μA operating and
<3μAinshutdown)andwell-controlledindropout,making
it an excellent choice for battery-powered circuits.
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Low Noise: 20μV
(Positive) and
RMS
30μV
(Negative)
RMS
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Low Quiescent Current: 30μA/Channel
Wide Input Voltage Range: 2ꢀ3V to 20V
Output Current: 150mA
Low Shutdown Current: <3μA Total (Typical)
Low Dropout Voltage: 300mV/Channel
Adjustable Outputs from 1.22V to 20V
No Protection Diodes Needed
Another key feature of the LT3032 is low output noise.
Addinganexternal10nFbypasscapacitortoeachregulator
reducesoutputnoiseto20μV
30μV
overa10Hzto
RMS/
RMS
Stable with 2.2μF Output Capacitors
Stable with Ceramic, Tantalum or Aluminum Capacitors
Starts into Reverse Output Voltage
Current Limit and Thermal Limit
100kHz bandwidth. The LT3032 is stable with minimum
output capacitors of 2.2μF. The regulators do not require
the addition of ESR as is common with other regulators.
Internal protection circuitry includes reverse output prot-
ection,currentlimiting,andthermallimiting.Eachregulator
is offered as an adjustable output device with an output
voltage down to the 1.22V reference voltages.
Low Profile 14-Lead 4mm × 3mm × 0.75mm
DFN Package
APPLICATIONS
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Battery-Powered Instruments
The LT3032 is available in a unique low profile 14-lead
4mm × 3mm × 0.75mm DFN package with exposed back-
side pads for each regulator, allowing optimum thermal
performance.
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Bipolar Power Supplies
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Low Noise Power Supplies
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
Dual Polarity Low Noise 150mA Power Supply
10Hz to 100kHz Output Noise
LT3032
OUTP
5V OUT AT 150mA
20μV NOISE
INP
RMS
OUTP
768k
249k
5.4V TO
20V
20μV
30μV
RMS
100μV/DIV
0.01μF
ADJP
10μF
10μF
10μF
<0.25V = OFF
>2V = ON
SHDNP
BYPP
GND
OUTN
100μV/DIV
RMS
BYPN
SHDNN
10μF
249k
768k
3032 TA02a
1mS/DIV
ADJN
0.01μF
–5.4V TO
–20V
–5V OUT AT –150mA
30μV NOISE
INN
OUTN
RMS
3032 TA01
3032f
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