LT3032 Datasheet, PDF (1/20 Pages) Linear Technology – Dual 150mA Positive/Negative Low Noise Low Dropout Linear Regulator

LT3032
FEATURES
Dual 150mA
Positive/Negative Low Noise
Low Dropout Linear Regulator
DESCRIPTION
n _{Low Noise: 20μVRMS (Positive) and}
30μV_RMS (Negative)
n _{Low Quiescent Current: 30μA/Channel}
n _{Wide Input Voltage Range: ±2.3V to ±20V}
n _{Output Current: ±150mA}
n _{Low Shutdown Current: <3μA Total (Typical)}
n _{Low Dropout Voltage: 300mV/Channel}
n _{Adjustable Outputs from ±1.22V to ±20V}
n _{No Protection Diodes Needed}
n _{Stable with 2.2μF Output Capacitors}
n _{Stable with Ceramic, Tantalum or Aluminum Capacitors}
n _{Starts into Reverse Output Voltage}
n _{Current Limit and Thermal Limit}
n _{Low Profile 14-Lead 4mm × 3mm × 0.75mm}
DFN Package
APPLICATIONS
n _{Battery-Powered Instruments}
n _{Bipolar Power Supplies}
n _{Low Noise Power Supplies}
The LT^®3032 is a dual, low noise, positive and negative low
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
<3μA in shutdown) and well-controlled in dropout, making
it an excellent choice for battery-powered circuits.
Another key feature of the LT3032 is low output noise.
Adding an external 10nF bypass capacitor to each regulator
reduces output noise to 20μV_RMS/30μV_RMS over a 10Hz to
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, current limiting, and thermal limiting. Each regulator
is offered as an adjustable output device with an output
voltage down to the ±1.22V reference voltages.
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.
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
5.4V TO
20V
<0.25V = OFF
>2V = ON
–5.4V TO
–20V
LT3032
INP
OUTP
10μF
SHDNP
SHDNN
10μF
ADJP
BYPP
GND
BYPN
ADJN
INN
OUTN
3032 TA01
768k
249k
249k
768k
0.01μF
5V OUT AT 150mA
20μV_RMS NOISE
10μF
0.01μF
10μF
–5V OUT AT –150mA
30μV_RMS NOISE
10Hz to 100kHz Output Noise
OUTP
100μV/DIV
20μV_RMS
OUTN
100μV/DIV
1mS/DIV
30μV_RMS
3032 TA02a
3032f
1