LT3015 Datasheet, PDF (1/26 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 –29.3V}
n _{Fixed Output Voltages: –2.5V, –3V, –3.3V, –5V, –12V, –15V}
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 Series
1.5A, Low Noise,
Negative Linear Regulator
with Precision Current Limit
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.
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
circuitry includes reverse output protection, precision cur-
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.
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.
TYPICAL APPLICATION
–5V, –1.5A, Low Noise Regulator
V_IN
–5.5V TO
–30V
GND
10µF
LT3015-5
SHDN
SENSE
IN
OUT
3015 TA01
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
3015fb
1