LT3015 Series
1.5A, Low Noise,
Negative Linear Regulator
with Precision Current Limit
FEATURES
DESCRIPTION
The LT®3015 series are low noise, low dropout, negative
linear regulators with fast transient response. The devices
supply up to 1.5A of output current at a typical dropout
voltage of 310mV. Operating quiescent current is typically
1.1mA and drops to < 1µA in shutdown. Quiescent current
is also well controlled in dropout. In addition to fast tran-
sient response, the LT3015 series exhibit very low output
noise, making them ideal for noise sensitive applications.
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Output Current: 1.5A
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Dropout Voltage: 310mV
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Precision Current Limit with Foldback
Low Output Noise: 60µV
Low Quiescent Current: 1.1mA
Precision Positive or Negative Shutdown Logic
Fast Transient Response
Wide Input Voltage Range: –1.8V to –30V
Adjustable Output Voltage Range: –1.22V to –29.3V
Fixed Output Voltages: –2.5V, –3V, –3.3V, –5V, –12V, –15V
Controlled Quiescent Current in Dropout
<1µA Quiescent Current in Shutdown
Stable with 10µF Output Capacitor
Stable with Ceramic, Tantalum or Aluminum Capacitors
Thermal Limit with Hysteresis
Reverse Output Protection
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(10Hz to 100kHz)
RMS
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The LT3015 regulators are stable with a minimum 10µF
output capacitor. Moreover, the regulator can use small
ceramic capacitors without the necessary addition of ESR
as is common with other regulators. Internal protection
circuitryincludesreverseoutputprotection,precisioncur-
rent limit with foldback and thermal limit with hysteresis.
The LT3015 regulators are available in fixed output volt-
ages of –2.5V, –3V, –3.3V, –5V, –12V and –15V and as an
adjustable device with a –1.22V reference voltage. Pack-
ages include the 5-lead TO-220 and DD-Pak, a thermally
enhanced 12-lead MSOP and the low profile (0.75 mm)
8-lead 3mm × 3mm DFN.
5-Lead TO-220 and DD-Pak, Thermally Enhanced
12-Lead MSOP and 8-Lead 3mm × 3mm × 0.75mm
DFN Packages
APPLICATIONS
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.
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Post-Regulator for Switching Supplies
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Negative Logic Supplies
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Low Noise Instrumentation
Industrial Supplies
Negative Complement to the LT1963A
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Dropout Voltage
TYPICAL APPLICATION
450
T
= 25°C
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–5V, –1.5A, Low Noise Regulator
400
350
300
250
200
150
100
50
GND
DD-PAK/TO-220
LT3015-5
10µF
10µF
SHDN
SENSE
DFN/MSOP
V
V
OUT
–5V
–1.5A
IN
IN
OUT
–5.5V TO
–30V
3015 TA01
0
0
–0.2 –0.4 –0.6 –0.8 –1.0 –1.2 –1.4 –1.6
LOAD CURRENT (A)
3015 TA01a
3015fb
1