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PDF LT3015 Data sheet ( Hoja de datos )
| Número de pieza | LT3015 | |
| Descripción | 1.5A Low Noise Negative Linear Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT3015
FEATURES
1.5A, Low Noise,
Negative Linear Regulator
with Precision Current Limit
DESCRIPTION
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
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 L T3015 exhibits ver y 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 necessar y addition of ESR as is
common with other regulators. Internal protection cuiritry
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
VIN
–5.5V TO
–30V
GND
10μF
LT3015
SHDN
ADJ
IN OUT
3015 TA01
3.40k
1%
10.5k
1%
10μF
VOUT
–5V
–1.5A
Dropout Voltage
450
TJ = 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
http://www.Datasheet4U.com
1 page  
LT3015
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
Typical Dropout Voltage
(DFN/MSOP)
450
400
350
300
250
200
150
100
50
0
0
125°C
25°C
–40°C
–55°C
–0.2 –0.4 –0.6 –0.8 –1 –1.2 –1.4 –1.6
OUTPUT CURRENT (A)
3015 G01
Typical Dropout Voltage
(DD-PAK/TO-220)
600
500
400
300
200
100
0
0
125°C
25°C
–40°C
–55°C
–0.2 –0.4 –0.6 –0.8 –1 –1.2 –1.4 –1.6
OUTPUT CURRENT (A)
3015 G04
Guaranteed Dropout Voltage
(DFN/MSOP)
600
500
TJ ≤ 125°C
400
300
TJ ≤ 25°C
200
100
= TEST POINTS
0
0 –0.2 –0.4 –0.6 –0.8 –1 –1.2 –1.4 –1.6
OUTPUT CURRENT (A)
3015 G02
Guaranteed Dropout Voltage
(DD-PAK/TO-220)
800
700
600 TJ ≤ 125°C
500
400
300 TJ ≤ 25°C
200
100
0
0
= TEST POINTS
–0.2 –0.4 –0.6 –0.8 –1 –1.2 –1.4 –1.6
OUTPUT CURRENT (A)
3015 G05
Dropout Voltage (DFN/MSOP)
500
450
400
IL = –1.5A
350
300
250
200 IL = –0.5A
150 IL = –0.1A
100
50 IL = –1mA
0
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
3015 G03
Dropout Voltage (DD-PAK/TO-220)
600
500
IL = –1.5A
400
300
IL = –0.5A
200
IL = –0.1A
100
IL = –1mA
0
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
3015 G06
Quiescent Current
–1.4
–1.2
VSHDN = VIN
–1
–0.8
–0.6
VIN = –6V
–0.4 RL = 120kΩ, IL = –10μA
VOUT = –1.22V
–0.2
VSHDN = 0V
0
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
3015 G07
LT3015 ADJ Pin Voltage
–1.244
–1.238
VIN = –2.3V
IL = –1mA
–1.232
–1.226
–1.220
–1.214
–1.208
–1.202
–1.196
–1.192
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
3015 G08
LT3015 Output Voltage
–5.100
–5.075
–5.050
VIN = –5.5V
IL = –1mA
VOUT = –5V
–5.025
–5.000
–4.975
–4.950
–4.925
–4.900
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
3015 G09
3015f
5
5 Page 
BLOCK DIAGRAM
1.21V
_
SHDN
+
–
–1.20V
+
GND
LT3015
ADJ
VREF –
ERROR AMP
+
BIAS CIRCUITRY
+
I LIMIT AMP
–
ADJ PIN BIAS CURRENT
COMPENSATION
IN
OUT
NPN DRIVER
QPOWER
RSNS
VTH
+
I LIMIT FOLDBACK
3015 BD
APPLICATIONS INFORMATION
The LT3015 regulator is a 1.5A negative low dropout linear
regulator featuring precision current limit and precision
bi-directional shutdown. The device supplies up to 1.5A
of output load current at a typical dropout voltage of
310mV. Moreover, the low 1.1mA operating quiescent
current drops to less than 1 μA in shutdown. In addition
to low quiescent current, the LT3015 incorporates several
protection features that make it ideal for battery powered
applications. In dual supply applications where the regu-
lator’s load is returned to a positive supply , OUT can be
pulled above GND by 30V and still allow the L T3015 to
start up and operate.
GND
CIN LT3015
VIN SHDN
ADJ
IN OUT
R1
R2
3015 F01
( )VOUT
=
–1.22V
⎛⎝⎜1+
R2⎞
R1⎠⎟
+
IADJ
(R2)
VADJ = –1.22V AND IADJ = 30nA AT 25°C
OUTPUT RANGE = –1.22 TO – 29.5V
Figure 1. Adjustable Operation
COUT
VOUT
Adjustable Operation
The LT3015 regulator has an output voltage range of –1.22V
to –29.5V. Output voltage is set by the ratio of two external
resistors as shown in Figure 1. The device regulates the
ADJ Pin Voltage vs Temperature, ADJ Pin Bias Current vs
Temperature and ADJ Pin Bias Current vs Input V oltage
appear in the Typical Performance Characteristics section.
output to maintain the ADJ pin voltage to –1.22V referred The adjustable device is tested and specified with the
to ground. The current in R1 equals –1.22V /R1 and the ADJ pin tied to the OUT pin for a –1.22V output voltage.
current in R2 equals the current in R1 plus the ADJ pin Specifications for output voltages greater than –1.22V are
bias current. The ADJ pin bias current, 30nA at 25°C, flows proportional to the ratio of the desired V OUT to –1.22V
into the ADJ pin. Calculate the output voltage using the (VOUT/–1.22V). For example, load regulation for an out-
formula shown in Figure 1. The value of R1 should be less put current change of –1mA to –1.5A is typically 2mV at
than 50k to minimize errors in the output voltage created VOUT = –1.22V. At VOUT = –5V, load regulation equals:
by the ADJ pin bias current. Note that in shutdown, the
output is off and the divider current is zero. Curves of
(–5V/–1.22V) • (2mV) = 8.2mV
3015f
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LT3015.PDF ] | |
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