FEATURES
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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.
Output Current: 1.5A
Dropout Voltage: 310mV
Precision Current Limit with Foldback
Low Output Noise: 60µV
RMS
(10Hz to 100kHz)
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
5-Lead TO-220 and DD-Pak, Thermally Enhanced
12-Lead MSOP and 8-Lead 3mm
×
3mm
×
0.75mm
DFN Packages
APPLICATIONS
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Post-Regulator for Switching Supplies
Negative Logic Supplies
Low Noise Instrumentation
Industrial Supplies
Negative Complement to the LT1963A
TYPICAL APPLICATION
–5V, –1.5A, Low Noise Regulator
GND
10µF
LT3015-5
SHDN
V
IN
–5.5V TO
–30V
SENSE
10µF
V
OUT
–5V
–1.5A
DROPOUT VOLTAGE (mV)
Dropout Voltage
450
400
350
300
250
200
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
T
J
= 25°C
DD-PAK/TO-220
DFN/MSOP
IN
OUT
3015 TA01
1
LT3015 Series
ABSOLUTE MAXIMUM RATINGS
(Note 1)
IN Pin Voltage .........................................................±33V
OUT Pin Voltage (Note 10) ......................................±33V
OUT to IN Differential Voltage (Note 10) ........–0.3V, 33V
SENSE Pin Voltage
(with Respect to IN Pin) (Note 10) .................–0.3V, 33V
ADJ Pin Voltage
(with Respect to IN Pin) (Note 10) .................–0.3V, 33V
SHDN
Pin Voltage
(with Respect to IN Pin) (Note 10) .................–0.3V, 55V
SHDN
Pin Voltage
(with Respect to GND Pin) ..............................–33V, 22V
Output Short-Circuit Duration .......................... Indefinite
Operating Junction Temperature Range (Note 9)
E-, I-Grade ........................................ –40°C to 125°C
MP-Grade ......................................... –55°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10Sec)
MS12E Package ................................................ 300°C
Q, T Packages ................................................... 250°C
PIN CONFIGURATION
TOP VIEW
IN
IN
SHDN
GND
1
2
3
4
9
IN
8 OUT
7 OUT
6 SENSE/ADJ*
5 GND
IN
IN
IN
IN
SHDN
GND
1
2
3
4
5
6
TOP VIEW
12
11
10
9
8
7
OUT
OUT
OUT
OUT
SENSE/ADJ*
GND
13
IN
DD PACKAGE
8-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
q
JA
= 40°C/W,
q
JC
= 7.5°C/W
EXPOSED PAD (PIN 9) IS IN, MUST BE SOLDERED TO PCB
*PIN 6 = SENSE FOR LT3015-2.5/-3/-3.3/-5/-12/-15
*PIN 6 = ADJ FOR LT3015
FRONT VIEW
5
4
TAB IS IN
3
2
1
OUT
SENSE/ADJ*
IN
GND
SHDN
MSE PACKAGE
12-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
q
JA
= 37°C/W,
q
JC
= 10°C/W
EXPOSED PAD (PIN 13) IS IN, MUST BE SOLDERED TO PCB
*PIN 8 = SENSE FOR LT3015-2.5/-3/-3.3/-5/-12/-15
*PIN 8 = ADJ FOR LT3015
FRONT VIEW
5
4
TAB IS IN
3
2
1
T PACKAGE
5-LEAD PLASTIC TO-220
T
JMAX
= 125°C,
q
JA
= 50°C/W,
q
JC
= 3°C/W
*PIN 4 = SENSE FOR LT3015-2.5/-3/-3.3/-5/-12/-15
*PIN 4 = ADJ FOR LT3015
OUT
SENSE/ADJ*
IN
GND
SHDN
Q PACKAGE
5-LEAD PLASTIC DD-PAK
T
JMAX
= 125°C,
q
JA
= 14°C/W,
q
JC
= 3°C/W
*PIN 4 = SENSE FOR LT3015-2.5/-3/-3.3/-5/-12/-15
*PIN 4 = ADJ FOR LT3015
3015fb
2
LT3015 Series
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER
Minimum IN Pin Voltage
(Notes 2, 12)
CONDITIONS
I
LOAD
= –0.5A
I
LOAD
= –1.5A
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ELECTRICAL CHARACTERISTICS
MIN
TYP
–1.8
–1.8
MAX
–2.3
–2.525
–2.55
–3.03
–3.06
–3.333
–3.366
–5.05
–5.1
–12.12
–12.24
–15.15
–15.3
–1.232
–1.244
12
15
16
20
27
27
6
6
18
7.5
23
10.5
25
10.5
26
25
62
30
73
3.8
9
0.095
0.16
0.16
0.24
0.23
0.32
0.27
0.39
0.39
0.5
0.51
0.68
2.4
2.5
7
23
70
130
UNITS
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
V
V
V
V
V
V
V
V
V
V
V
V
mA
mA
mA
mA
mA
µV
RMS
µA
3015fb
Regulated Output Voltage (Note 3) LT3015-2.5: V
IN
= –3.0V, I
LOAD
= –1mA
LT3015-2.5: –30V < V
IN
< –3.5V, –1.5A < I
LOAD
< –1mA
LT3015-3: V
IN
= –3.5, I
LOAD
= –1mA
LT3015-3: –30V < V
IN
< –4 V, –1.5A < I
LOAD
< –1mA
LT3015-3.3: V
IN
= –3.8, I
LOAD
= –1mA
LT3015-3.3: –30V < V
IN
< –4.3V, –1.5A < I
LOAD
< –1mA
LT3015-5: V
IN
= –5.5, I
LOAD
= –1mA
LT3015-5: –30V < V
IN
< –6V, –1.5A < I
LOAD
< –1mA
LT3015-12: V
IN
= –12.5, I
LOAD
= –1mA
LT3015-12: –30V < V
IN
< –13V, –1.5A < I
LOAD
< –1mA
LT3015-15: V
IN
= –15.5, I
LOAD
= –1mA
LT3015-15: –30V < V
IN
< –16V, –1.5A < I
LOAD
< –1mA
ADJ Pin Voltage (Notes 2, 3)
Line Regulation
LT3015: V
IN
= –2.3V, I
LOAD
= –1mA
LT3015: –30V < V
IN
< –2.3V, –1.5A < I
LOAD
< –1mA
LT3015-2.5: ∆V
IN
= –3.0V to –30V, I
LOAD
= –1mA
LT3015-3: ∆V
IN
= –3.5V to –30V, I
LOAD
= –1mA
LT3015-3.3: ∆V
IN
= –3.8V to –30V, I
LOAD
= –1mA
LT3015-5: ∆V
IN
= –5.5V to –30V, I
LOAD
= –1mA
LT3015-12: ∆V
IN
= –12.5V to –30V, I
LOAD
= –1mA
LT3015-15: ∆V
IN
= –15.5V to –30V, I
LOAD
= –1mA
LT3015: ∆V
IN
= –2.3V to –30V, I
LOAD
= –1mA (Note 2)
LT3015-2.5: V
IN
= –3.5V, ∆I
LOAD
= –1mA to –1.5A
LT3015-2.5: V
IN
= –3.5V, ∆I
LOAD
= –1mA to –1.5A
LT3015-3: V
IN
= –4V, ∆I
LOAD
= –1mA to –1.5A
LT3015-3: V
IN
= –4V, ∆I
LOAD
= –1mA to –1.5A
LT3015-3.3: V
IN
= –4.3V, ∆I
LOAD
= –1mA to –1.5A
LT3015-3.3: V
IN
= –4.3V, ∆I
LOAD
= –1mA to –1.5A
LT3015-5: V
IN
= –6V, ∆I
LOAD
= –1mA to –1.5A
LT3015-5: V
IN
= –6V, ∆I
LOAD
= –1mA to –1.5A
LT3015-12: V
IN
= –13V, ∆I
LOAD
= –1mA to –1.5A
LT3015-12: V
IN
= –13V, ∆I
LOAD
= –1mA to –1.5A
LT3015-15: V
IN
= –16V, ∆I
LOAD
= –1mA to –1.5A
LT3015-15: V
IN
= –16V, ∆I
LOAD
= –1mA to –1.5A
LT3015: V
IN
= –2.3V, ∆I
LOAD
= –1mA to –1.5A (Note 2)
LT3015: V
IN
= –2.3V, ∆I
LOAD
= –1mA to –1.5A (Note 2)
I
LOAD
= –1mA
I
LOAD
= –1mA
I
LOAD
= –100mA
I
LOAD
= –100mA
I
LOAD
= –500mA (DFN/MSOP)
I
LOAD
= –500mA (DFN/MSOP)
I
LOAD
= –500mA (DD-PAK/TO-220)
I
LOAD
= –500mA (DD-PAK/TO-220)
I
LOAD
= –1.5A (DFN/MSOP)
I
LOAD
= –1.5A (DFN/MSOP)
I
LOAD
= –1.5A (DD-PAK/TO-220)
I
LOAD
= –1.5A (DD-PAK/TO-220)
I
LOAD
= 0mA
I
LOAD
= –1mA
I
LOAD
= –100mA
I
LOAD
= –500mA
I
LOAD
= –1.5A
LT3015: C
OUT
= 10µF I
LOAD
= –1.5A, BW = 10Hz to 100kHz, V
OUT
= –1.22V
,
–2.475
–2.45
–2.97
–2.94
–3.267
–3.234
–4.95
–4.9
–11.88
–11.76
–14.85
–14.7
–1.208
–1.196
–2.5
–2.5
–3
–3
–3.3
–3.3
–5
–5
–12
–12
–15
–15
–1.22
–1.22
4
4.5
5
5.5
9
9
2.5
3
4
Load Regulation
l
5
l
5.5
l
13
l
16
l
2
l
Dropout Voltage
V
IN
= V
OUT(NOMINAL)
(Notes 4, 5)
0.055
l
0.1
l
0.17
l
0.2
l
0.31
l
0.41
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l
l
GND Pin Current
V
IN
= V
OUT(NOMINAL)
(Notes 4, 6)
1.1
1.15
2.9
9.5
35
60
70
100
Output Voltage Noise (Note 2)
SENSE Pin Bias Current (Note 13) LT3015-2.5/-3/-3.3/-5/-12/-15
l
5
嵌入式系统
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