LT3015 Datasheet, PDF (1/20 Pages) Linear Technology – 1.5A, Low Noise, Negative Linear Regulator

FEATURES
n _{Output Current: 1.5A}
n _{Dropout Voltage: 310mV}
n _{Precision Current Limit with Foldback}
n _{Low Output Noise: 60μVRMS (10Hz to 100kHz)}
n _{Low Quiescent Current: 1.1mA}
n _{Precision Positive or Negative Shutdown Logic}
n _{Fast Transient Response}
n _{Wide Input Voltage Range: –1.8V to –30V}
n _{Adjustable Output Voltage Range: –1.22V to –29.5V}
n _{Controlled Quiescent Current in Dropout}
n _{< 1μA Quiescent Current in Shutdown}
n _{Stable with 10μF Output Capacitor}
n _{Stable with Ceramic, Tantalum or Aluminum Capacitors}
n _{Thermal Limit with Hysteresis}
n _{Reverse Output Protection}
n _{5-Lead TO-220 and DD-Pak, Thermally Enhanced}
12-Lead MSOP and 8-Lead 3mm × 3mm × 0.75mm
DFN Packages
APPLICATIONS
n _{Post-Regulator for Switching Supplies}
n _{Negative Logic Supplies}
n _{Low Noise Instrumentation}
n _{Industrial Supplies}
n _{Negative Complement to the LT1963A}
LT3015
1.5A, Low Noise,
Negative Linear Regulator
with Precision Current Limit
DESCRIPTION
The LT^®3015 is a low noise, low dropout, negative linear
regulator with fast transient response. The device supplies
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 transient
response, the LT3015 exhibits very low output noise,
making it ideal for noise sensitive applications.
The LT3015 regulator is 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 circuitry
includes reverse output protection, precision current limit
with foldback and thermal limit with hysteresis.
The LT3015 is available as an adjustable device with a
–1.22V reference voltage. Packages 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.
L, LT, LTC, LTM, ThinSOT, 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
–5V, –1.5A, Low-Noise Regulator
V_IN
–5.5V TO
–30V
GND
10μF
LT3015
SHDN
ADJ
IN
OUT
3015 TA01
3.40k
1%
10.5k
1%
10μF
V_OUT
–5V
–1.5A
Dropout Voltage
450
T_J = 25°C
400
350
300
DD-PAK/TO-220
250
200
DFN/MSOP
150
100
50
0
0 –0.2 –0.4 –0.6 –0.8 –1.0 –1.2 –1.4 –1.6
LOAD CURRENT (A)
3015 TA01a
3015f
1