LT1185IQ#PBF [Linear]
LT1185 - Low Dropout Regulator; Package: DD PAK; Pins: 5; Temperature Range: -40°C to 85°C;型号: | LT1185IQ#PBF |
厂家: | Linear |
描述: | LT1185 - Low Dropout Regulator; Package: DD PAK; Pins: 5; Temperature Range: -40°C to 85°C 稳压器 |
文件: | 总26页 (文件大小:537K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
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.
n
Output Current: 1.5A
n
Dropout Voltage: 310mV
n
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
n
(10Hz to 100kHz)
RMS
n
n
n
n
n
n
n
n
n
n
n
n
n
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.
n
Post-Regulator for Switching Supplies
n
Negative Logic Supplies
n
Low Noise Instrumentation
Industrial Supplies
Negative Complement to the LT1963A
n
n
Dropout Voltage
TYPICAL APPLICATION
450
T
= 25°C
J
–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
LT3015 Series
ABSOLUTE MAXIMUM RATINGS
(Note 1)
SHDN Pin Voltage
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
(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
TOP VIEW
1
2
3
4
5
6
IN
IN
IN
12 OUT
11 OUT
10 OUT
IN
IN
1
2
3
4
8
7
6
5
OUT
OUT
13
IN
9
IN
IN
9
8
7
OUT
SENSE/ADJ*
GND
SHDN
GND
SENSE/ADJ*
GND
SHDN
GND
MSE PACKAGE
DD PACKAGE
12-LEAD PLASTIC MSOP
8-LEAD (3mm × 3mm) PLASTIC DFN
T
JMAX
= 125°C, q = 37°C/W, q = 10°C/W
JA JC
T
= 125°C, q = 40°C/W, q = 7.5°C/W
JA JC
JMAX
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
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
FRONT VIEW
5
4
3
2
1
OUT
5
4
3
2
1
OUT
SENSE/ADJ*
IN
SENSE/ADJ*
IN
TAB IS IN
TAB IS IN
GND
GND
SHDN
SHDN
Q PACKAGE
5-LEAD PLASTIC DD-PAK
T PACKAGE
5-LEAD PLASTIC TO-220
T
= 125°C, q = 14°C/W, q = 3°C/W
T
= 125°C, q = 50°C/W, q = 3°C/W
JMAX JA JC
JMAX
JA
JC
*PIN 4 = SENSE FOR LT3015-2.5/-3/-3.3/-5/-12/-15
*PIN 4 = ADJ FOR LT3015
*PIN 4 = SENSE FOR LT3015-2.5/-3/-3.3/-5/-12/-15
*PIN 4 = ADJ FOR LT3015
3015fb
2
LT3015 Series
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
LFXS
PACKAGE DESCRIPTION
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
LT3015EDD#PBF
LT3015EDD#TRPBF
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
12-Lead Plastic MSOP
LT3015IDD#PBF
LT3015IDD#TRPBF
LFXS
LT3015EDD-2.5#PBF
LT3015IDD-2.5#PBF
LT3015EDD-3#PBF
LT3015IDD-3#PBF
LT3015EDD-2.5#TRPBF
LT3015IDD-2.5#TRPBF
LT3015EDD-3#TRPBF
LT3015IDD-3#TRPBF
LT3015EDD-3.3#TRPBF
LT3015IDD-3.3#TRPBF
LT3015EDD-5#TRPBF
LT3015IDD-5#TRPBF
LT3015EDD-12#TRPBF
LT3015IDD-12#TRPBF
LT3015EDD-15#TRPBF
LT3015IDD-15#TRPBF
LT3015EMSE#TRPBF
LT3015IMSE#TRPBF
LGDJ
LGDJ
LGDK
LGDK
LT3015EDD-3.3#PBF
LT3015IDD-3.3#PBF
LT3015EDD-5#PBF
LT3015IDD-5#PBF
LGDM
LGDM
LGDN
LGDN
LT3015EDD-12#PBF
LT3015IDD-12#PBF
LT3015EDD-15#PBF
LT3015IDD-15#PBF
LT3015EMSE#PBF
LGDP
LGDP
LGDQ
LGDQ
3015
LT3015IMSE#PBF
3015
12-Lead Plastic MSOP
LT3015MPMSE#PBF
LT3015EMSE-2.5#PBF
LT3015IMSE-2.5#PBF
LT3015MPMSE-2.5#PBF
LT3015EMSE-3#PBF
LT3015IMSE-3#PBF
LT3015MPMSE-3#PBF
LT3015EMSE-3.3#PBF
LT3015IMSE-3.3#PBF
LT3015MPMSE-3.3#PBF
LT3015EMSE-5#PBF
LT3015IMSE-5#PBF
LT3015MPMSE-5#PBF
LT3015EMSE-12#PBF
LT3015IMSE-12#PBF
LT3015MPMSE-12#PBF
LT3015EMSE-15#PBF
LT3015IMSE-15#PBF
LT3015MPMSE-15#PBF
LT3015MPMSE#TRPBF
LT3015EMSE-2.5#TRPBF
LT3015IMSE-2.5#TRPBF
LT3015MPMSE-2.5#TRPBF
LT3015EMSE-3#TRPBF
LT3015IMSE-3#TRPBF
LT3015MPMSE-3#TRPBF
LT3015EMSE-3.3#TRPBF
LT3015IMSE-3.3#TRPBF
LT3015MPMSE-3.3#TRPBF
LT3015EMSE-5#TRPBF
LT3015IMSE-5#TRPBF
LT3015MPMSE-5#TRPBF
LT3015EMSE-12#TRPBF
LT3015IMSE-12#TRPBF
LT3015MPMSE-12#TRPBF
LT3015EMSE-15#TRPBF
LT3015IMSE-15#TRPBF
LT3015MPMSE-15#TRPBF
3015
12-Lead Plastic MSOP
301525
301525
301525
30153
30153
30153
301533
301533
301533
30155
30155
30155
301512
301512
301512
301515
301515
301515
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead Plastic MSOP
3015fb
3
LT3015 Series
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
LT3015Q
PACKAGE DESCRIPTION
5-Lead Plastic DD-Pak
5-Lead Plastic DD-Pak
5-Lead Plastic DD-Pak
5-Lead Plastic DD-Pak
5-Lead Plastic DD-Pak
5-Lead Plastic DD-Pak
5-Lead Plastic DD-Pak
5-Lead Plastic DD-Pak
5-Lead Plastic DD-Pak
5-Lead Plastic DD-Pak
5-Lead Plastic DD-Pak
5-Lead Plastic DD-Pak
5-Lead Plastic DD-Pak
5-Lead Plastic DD-Pak
5-Lead Plastic DD-Pak
5-Lead Plastic DD-Pak
5-Lead Plastic DD-Pak
5-Lead Plastic DD-Pak
5-Lead Plastic DD-Pak
5-Lead Plastic DD-Pak
5-Lead Plastic DD-Pak
5-Lead Plastic TO-220
5-Lead Plastic TO-220
5-Lead Plastic TO-220
5-Lead Plastic TO-220
5-Lead Plastic TO-220
5-Lead Plastic TO-220
5-Lead Plastic TO-220
5-Lead Plastic TO-220
5-Lead Plastic TO-220
5-Lead Plastic TO-220
5-Lead Plastic TO-220
5-Lead Plastic TO-220
5-Lead Plastic TO-220
5-Lead Plastic TO-220
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
LT3015EQ#PBF
LT3015EQ#TRPBF
LT3015IQ#PBF
LT3015IQ#TRPBF
LT3015Q
LT3015MPQ#PBF
LT3015EQ-2.5#PBF
LT3015IQ-2.5#PBF
LT3015MPQ-2.5#PBF
LT3015EQ-3#PBF
LT3015IQ-3#PBF
LT3015MPQ-3#PBF
LT3015EQ-3.3#PBF
LT3015IQ-3.3#PBF
LT3015MPQ-3.3#PBF
LT3015EQ-5#PBF
LT3015IQ-5#PBF
LT3015MPQ-5#PBF
LT3015EQ-12#PBF
LT3015IQ-12#PBF
LT3015MPQ-12#PBF
LT3015EQ-15#PBF
LT3015IQ-15#PBF
LT3015MPQ-15#PBF
LT3015ET#PBF
LT3015MPQ#TRPBF
LT3015EQ-2.5#TRPBF
LT3015IQ-2.5#TRPBF
LT3015MPQ-2.5#TRPBF
LT3015EQ-3#TRPBF
LT3015IQ-3#TRPBF
LT3015MPQ-3#TRPBF
LT3015EQ-3.3#TRPBF
LT3015IQ-3.3#TRPBF
LT3015MPQ-3.3#TRPBF
LT3015EQ-5#TRPBF
LT3015IQ-5#TRPBF
LT3015MPQ-5#TRPBF
LT3015EQ-12#TRPBF
LT3015IQ-12#TRPBF
LT3015MPQ-12#TRPBF
LT3015EQ-15#TRPBF
LT3015IQ-15#TRPBF
LT3015MPQ-15#TRPBF
LT3015ET#TRPBF
LT3015Q
LT3015Q-2.5
LT3015Q-2.5
LT3015Q-2.5
LT3015Q-3
LT3015Q-3
LT3015Q-3
LT3015Q-3.3
LT3015Q-3.3
LT3015Q-3.3
LT3015Q-5
LT3015Q-5
LT3015Q-5
LT3015Q-12
LT3015Q-12
LT3015Q-12
LT3015Q-15
LT3015Q-15
LT3015Q-15
LT3015T
LT3015IT#PBF
LT3015IT#TRPBF
LT3015T
LT3015ET-2.5#PBF
LT3015IT-2.5#PBF
LT3015ET-3#PBF
LT3015IT-3#PBF
LT3015ET-2.5#TRPBF
LT3015IT-2.5#TRPBF
LT3015ET-3#TRPBF
LT3015IT-3#TRPBF
LT3015ET-3.3#TRPBF
LT3015IT-3.3#TRPBF
LT3015ET-5#TRPBF
LT3015IT-5#TRPBF
LT3015ET-12#TRPBF
LT3015IT-12#TRPBF
LT3015ET-15#TRPBF
LT3015IT-15#TRPBF
LT3015T-2.5
LT3015T-2.5
LT3015T-3
LT3015T-3
LT3015ET-3.3#PBF
LT3015IT-3.3#PBF
LT3015ET-5#PBF
LT3015IT-5#PBF
LT3015T-3.3
LT3015T-3.3
LT3015T-5
LT3015T-5
LT3015ET-12#PBF
LT3015IT-12#PBF
LT3015ET-15#PBF
LT3015IT-15#PBF
LT3015T-12
LT3015T-12
LT3015T-15
LT3015T-15
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
3015fb
4
LT3015 Series
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum IN Pin Voltage
(Notes 2, 12)
I
I
= –0.5A
= –1.5A
–1.8
–1.8
V
V
LOAD
LOAD
l
–2.3
Regulated Output Voltage (Note 3) LT3015-2.5: V = –3.0V, I
= –1mA
LOAD
–2.475
–2.45
–2.97
–2.94
–3.267
–3.234
–4.95
–4.9
–11.88
–11.76
–14.85
–14.7
–2.5
–2.5
–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
V
V
V
V
V
V
V
V
V
V
V
V
IN
l
l
l
l
l
l
LT3015-2.5: –30V < V < –3.5V, –1.5A < I
< –1mA
IN
LOAD
LOAD
LOAD
LT3015-3: V = –3.5, I
= –1mA
IN
LT3015-3: –30V < V < –4 V, –1.5A < I
< –1mA
–3
IN
LOAD
LT3015-3.3: V = –3.8, I
= –1mA
–3.3
–3.3
–5
IN
LOAD
LT3015-3.3: –30V < V < –4.3V, –1.5A < I
< –1mA
IN
LOAD
LT3015-5: V = –5.5, I
= –1mA
IN
LT3015-5: –30V < V < –6V, –1.5A < I
< –1mA
LOAD
–5
IN
LT3015-12: V = –12.5, I
= –1mA
–12
–12
–15
–15
IN
LOAD
LT3015-12: –30V < V < –13V, –1.5A < I
< –1mA
< –1mA
IN
LOAD
LOAD
LT3015-15: V = –15.5, I
= –1mA
IN
LOAD
LT3015-15: –30V < V < –16V, –1.5A < I
IN
ADJ Pin Voltage (Notes 2, 3)
Line Regulation
LT3015: V = –2.3V, I
= –1mA
LOAD
–1.208 –1.22 –1.232
–1.196 –1.22 –1.244
V
V
IN
l
LT3015: –30V < V < –2.3V, –1.5A < I
< –1mA
LOAD
IN
l
l
l
l
l
l
l
LT3015-2.5: ∆V = –3.0V to –30V, I
= –1mA
LOAD
4
4.5
5
12
15
16
20
27
27
6
mV
mV
mV
mV
mV
mV
mV
IN
LT3015-3: ∆V = –3.5V to –30V, I
= –1mA
LOAD
IN
LT3015-3.3: ∆V = –3.8V to –30V, I
= –1mA
LOAD
IN
LT3015-5: ∆V = –5.5V to –30V, I
= –1mA
LOAD
5.5
9
IN
LT3015-12: ∆V = –12.5V to –30V, I
= –1mA
= –1mA
IN
LOAD
LOAD
LT3015-15: ∆V = –15.5V to –30V, I
9
IN
LT3015: ∆V = –2.3V to –30V, I
= –1mA (Note 2)
LOAD
2.5
IN
Load Regulation
LT3015-2.5: V = –3.5V, ∆I
= –1mA to –1.5A
= –1mA to –1.5A
3
6
18
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
IN
LOAD
LOAD
= –1mA to –1.5A
= –1mA to –1.5A
l
l
l
l
l
l
l
LT3015-2.5: V = –3.5V, ∆I
IN
LT3015-3: V = –4V, ∆I
4
7.5
23
IN
LOAD
LOAD
LT3015-3: V = –4V, ∆I
IN
LT3015-3.3: V = –4.3V, ∆I
= –1mA to –1.5A
= –1mA to –1.5A
= –1mA to –1.5A
= –1mA to –1.5A
= –1mA to –1.5A
= –1mA to –1.5A
= –1mA to –1.5A
= –1mA to –1.5A
= –1mA to –1.5A (Note 2)
= –1mA to –1.5A (Note 2)
5
10.5
25
IN
LOAD
LOAD
LT3015-3.3: V = –4.3V, ∆I
IN
LT3015-5: V = –6V, ∆I
5.5
13
16
2
10.5
26
IN
LOAD
LOAD
LT3015-5: V = –6V, ∆I
IN
LT3015-12: V = –13V, ∆I
25
IN
LOAD
LOAD
LOAD
LOAD
LT3015-12: V = –13V, ∆I
62
IN
LT3015-15: V = –16V, ∆I
30
IN
LT3015-15: V = –16V, ∆I
73
IN
LT3015: V = –2.3V, ∆I
3.8
9
IN
LOAD
LOAD
LT3015: V = –2.3V, ∆I
IN
Dropout Voltage
= V
I
I
I
I
I
I
I
I
I
I
I
I
= –1mA
0.055
0.1
0.095
0.16
0.16
0.24
0.23
0.32
0.27
0.39
0.39
0.5
V
V
V
V
V
V
V
V
V
V
V
V
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
l
l
l
l
l
l
V
(Notes 4, 5)
OUT(NOMINAL)
= –1mA
IN
= –100mA
= –100mA
= –500mA (DFN/MSOP)
= –500mA (DFN/MSOP)
= –500mA (DD-PAK/TO-220)
= –500mA (DD-PAK/TO-220)
= –1.5A (DFN/MSOP)
= –1.5A (DFN/MSOP)
= –1.5A (DD-PAK/TO-220)
= –1.5A (DD-PAK/TO-220)
0.17
0.2
0.31
0.41
0.51
0.68
l
l
l
l
l
GND Pin Current
= V
I
I
I
I
I
= 0mA
1.1
1.15
2.9
9.5
35
2.4
2.5
7
23
70
mA
mA
mA
mA
mA
LOAD
LOAD
LOAD
LOAD
LOAD
V
(Notes 4, 6)
OUT(NOMINAL)
= –1mA
= –100mA
= –500mA
= –1.5A
IN
Output Voltage Noise (Note 2)
LT3015: C
= 10µF, I
= –1.5A, BW = 10Hz to 100kHz, V
= –1.22V
60
µV
RMS
OUT
LOAD
OUT
l
SENSE Pin Bias Current (Note 13) LT3015-2.5/-3/-3.3/-5/-12/-15
70
100
130
µA
3015fb
5
LT3015 Series
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
ADJ Pin Bias Current (Notes 2, 7) LT3015: V = –2.3V
–200
30
200
nA
IN
l
l
l
l
Shutdown Threshold (Note 11)
V
OUT
V
OUT
V
OUT
V
OUT
= Off-to-On (Positive)
= Off-to-On (Negative)
= On-to-Off (Positive)
= On-to-Off (Negative)
1.07
–1.34
0.5
1.21
–1.2
1.35
V
V
V
V
–1.06
0.73
–0.73
–0.5
l
l
l
SHDN Pin Current (Note 8)
V
SHDN
V
SHDN
V
SHDN
= 0V
= 15V
= –15V
–1
0
1
µA
µA
µA
17
27
–2.8
–4.5
l
Quiescent Current in Shutdown
Ripple Rejection
V
= –6V, V
= 0V
SHDN
0.01
6
µA
IN
LT3015-2.5: V = –4V (Avg)
52
52
51
48
43
40
55
62
62
61
58
53
50
65
dB
dB
dB
dB
dB
dB
dB
IN
V
= 0.5V
,
LT3015-3: V = –4.5V (Avg)
IN
RIPPLE P-P
= 120Hz,
RIPPLE
f
I
LT3015-3.3: V = –4.8V (Avg)
IN
= –1.5A
LT3015-5: V = –6.5V (Avg)
LOAD
IN
IN
IN
LT3015-12: V = –13.5V (Avg)
LT3015-15: V = –16.5V (Avg)
LT3015: V = –2.5V (Avg) (Note 2)
IN
l
l
l
Current Limit (Note 14)
V
= –2.3V, V
= 0V
OUT
1.7
1.7
1.7
2
2
2
2.3
2.3
2.3
A
A
A
IN
LT3015-2.5/-3/-3.3/-5/-12/-15: V = V
– 1V, ∆V
= –5%
IN
OUT(NOMINAL)
OUT
LT3015: V = –2.3V, ∆V
= 0.1V
OUT
IN
l
l
Input Reverse Leakage Current
LT3015-2.5/-3/-3.3/-5/-12/-15: V = 30V, V , V , V
= Open Circuit
4
5.5
1.7
mA
mA
IN
OUT ADJ SHDN
LT3015: V = 30V, V , VADJ, V = Open Circuit
SHDN
1.55
IN
OUT
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3015 adjustable version is tested and specified for these
conditions with the ADJ pin connected to the OUT pin.
Note 3: Maximum junction temperature limits operating conditions. The
regulated output voltage specification does not apply for all possible
combinations of input voltage and output current, especially due to the
current limit foldback which starts to decrease current limit at about
Note 8: Positive SHDN pin current flows into the SHDN pin.
Note 9: The LT3015 is tested and specified under pulsed load conditions
such that T ≅ T . The LT3015E is guaranteed to meet performance
specifications from 0°C to 125°C junction temperature. Specifications over
the –40°C to 125°C operating temperature range are assured by design,
characterization, and correlation with statistical process controls. The
LT3015I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT3015MP is 100% tested and guaranteed over
the full –55°C to 125°C operating junction temperature range.
Note 10: Parasitic diodes exist internally between the OUT, ADJ, SHDN
pins and the IN pin. Do not drive the OUT, ADJ, and SHDN pins more that
0.3V below the IN pin during fault conditions, and these pins must remain
at a voltage more positive than IN during normal operation.
J
A
|V – V | = 8V. If operating at maximum output current, limit the input
IN
OUT
voltage range. If operating at maximum input voltage, limit the output
current range.
Note 4: To satisfy minimum input voltage requirements, the LT3015 is
tested and specified for these conditions with an external resistor divider
(54.9k top, 49.9k bottom) for an output voltage of –2.56V. The external
resistor adds 25μA of DC load on the output.
Note 5: Dropout voltage is the minimum input-to-output voltage
differential needed to maintain regulation at a specified output current. In
Note 11: The SHDN threshold must be met to ensure device operation.
Note 12: For LT3015, the minimum input voltage refers to the lowest
input voltage before the parts goes out of regulation. For the fixed voltage
versions of LT3015, the minimum input voltage refers to the lowest input
voltage before the part can no longer sink 1.5A; for proper regulation, the
dropout voltage requirements must be met.
Note 13: Sense pin current flows out of the pin.
Note 14: The current limit circuit incorporates foldback that decreases
dropout, the output voltage is: V + V
.
IN
DROPOUT
Note 6: GND pin current is tested with V = V
and a current
IN
OUT(NOMINAL)
source load. Therefore, the device is tested while operating in dropout.
This is the worst-case GND pin current. GND pin current decreases slightly
at higher input voltages.
current limit for |V – V | ≥ 8V. Some level of output current is
IN
OUT
provided at all V – V
Performance Characteristics graph for Current Limit vs V – V
differential voltages. Please consult the Typical
IN
OUT
.
OUT
IN
Note 7: Positive ADJ pin bias current flows into the ADJ pin.
3015fb
6
LT3015 Series
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
Typical Dropout Voltage
(DFN/MSOP)
Guaranteed Dropout Voltage
(DFN/MSOP)
Dropout Voltage (DFN/MSOP)
450
400
350
300
250
200
150
100
50
600
500
400
300
200
100
0
500
450
400
350
300
250
200
150
100
50
I
L
= –1.5A
T ≤ 125°C
J
T ≤ 25°C
J
I
= –0.5A
L
I
L
= –0.1A
125°C
25°C
–40°C
–55°C
I
= –1mA
L
= TEST POINTS
0
0
0
–0.2 –0.4 –0.6 –0.8 –1 –1.2 –1.4 –1.6
OUTPUT CURRENT (A)
0
–0.2 –0.4 –0.6 –0.8 –1 –1.2 –1.4 –1.6
OUTPUT CURRENT (A)
–75 –50 –25
0
25 50 75 100 125 150 175
TEMPERATURE (°C)
3015 G01
3015 G02
3015 G03
Typical Dropout Voltage
(DD-PAK/TO-220)
Guaranteed Dropout Voltage
(DD-PAK/TO-220)
Dropout Voltage (DD-PAK/TO-220)
600
500
400
300
200
100
0
800
700
600
500
400
300
200
100
0
600
500
400
300
200
100
0
I
= –1.5A
= –0.5A
T ≤ 125°C
J
L
L
I
T ≤ 25°C
J
I
L
= –0.1A
125°C
25°C
–40°C
–55°C
I
= –1mA
L
= TEST POINTS
0
–0.2 –0.4 –0.6 –0.8 –1 –1.2 –1.4 –1.6
OUTPUT CURRENT (A)
0
–0.2 –0.4 –0.6 –0.8 –1 –1.2 –1.4 –1.6
OUTPUT CURRENT (A)
–75 –50 –25
0
25 50 75 100 125 150 175
TEMPERATURE (°C)
3015 G04
3015 G05
3015 G06
Quiescent Current
LT3015-2.5/-3/-3.3/-5/-12/-15
LT3015
LT3015 ADJ Pin Voltage
LT3015-2.5 Output Voltage
–1.4
–1.2
–1.0
–0.8
–0.6
–0.4
–0.2
0
–1.244
–1.238
–1.232
–1.226
–1.220
–1.214
–1.208
–1.202
–1.196
–1.192
–2.55
–2.54
–2.53
–2.52
–2.51
–2.50
–2.49
–2.48
–2.47
–2.46
–2.45
V
I
= –3V
= –1mA
V
I
= –2.3V
IN
L
IN
L
= –1mA
V
V
= –6V (LT3015/-2.5/-3/-3.3/-5)
= –16V (LT3015-12/-15)
IN
IN
L
L
R
R
= 120kΩ, I = –10µA (LT3015)
L
= ∞, I = –0µA
L
(LT3015-2.5/-3/-3.3/-5/-12/-15)
V
= 0V
SHDN
–75 –50 –25
0
25 50 75 100 125 150 175
–75 –50 –25
0
25 50 75 100 125 150 175
–75 –50 –25
0
25 50 75 100 125 150 175
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
3015 G07
3015 G09
3015 G08
3015fb
7
LT3015 Series
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
LT3015-3 Output Voltage
LT3015-3.3 Output Voltage
LT3015-5 Output Voltage
–3.060
–3.048
–3.036
–3.024
–3.012
–3.000
–2.988
–2.976
–2.964
–2.952
–2.940
–3.366
–3.354
–3.342
–3.330
–3.318
–3.306
–3.294
–3.282
–3.270
–3.258
–3.246
–3.234
–5.10
–5.08
–5.06
–5.04
–5.02
–5.00
–4.98
–4.96
–4.94
–4.92
–4.90
V
L
= –3.5V
V
L
= –3.8V
= –1mA
V
L
= –5.5V
IN
IN
IN
I
= –1mA
I
I = –1mA
–75 –50 –25
0
25 50 75 100 125 150 175
–75 –50 –25
0
25 50 75 100 125 150 175
–75 –50 –25
0
25 50 75 100 125 150 175
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
3015 G10
3015 G11
3015 G12
LT3015-12 Output Voltage
LT3015-15 Output Voltage
LT3015 Quiescent Current
–12.24
–12.20
–12.16
–12.12
–12.08
–12.04
–12.02
–12.00
–11.96
–11.92
–11.88
–11.84
–11.80
–11.76
–15.30
–15.25
–15.20
–15.15
–15.10
–15.05
–15.00
–14.95
–14.90
–14.85
–14.80
–14.75
–14.70
–1.2
–1.0
–0.8
–0.6
–0.4
–0.2
0
V
I
= –12.5V
= –1mA
V
I
= –15.5V
IN
L
IN
L
V
= V
IN
= –1mA
SHDN
T = 25°C
J
V
= –1.22V
OUT
R
= 121kΩ
L
V
= 0V
SHDN
–75 –50 –25
0
25 50 75 100 125 150 175
–75 –50 –25
0
25 50 75 100 125 150 175
0
–1 –2 –3 –4 –5 –6 –7 –8 –9 –10
TEMPERATURE (°C)
TEMPERATURE (°C)
INPUT VOLTAGE (V)
3015 G13
3015 G14
3015 G15
LT3015-2.5 Quiescent Current
LT3015-3 Quiescent Current
LT3015-3.3 Quiescent Current
–2.4
–2.0
–1.6
–1.2
–0.8
–0.4
0
–2.4
–2.1
–1.8
–1.5
–1.2
–0.9
–0.6
–0.3
0
–2.4
–2.1
–1.8
–1.5
–1.2
–0.9
–0.6
–0.3
0
T = 25°C
T = 25°C
T = 25°C
J
J
J
V
= –2.5V
V
= –3V
V
= –3.3V
OUT
OUT
OUT
R
= ∞
R
= ∞
R = ∞
L
L
L
V
= V
IN
SHDN
V
= V
IN
SHDN
V
= V
IN
SHDN
V
= 0V
V
= 0V
V
= 0V
SHDN
SHDN
SHDN
0
–3 –6 –9 –12 –15 –18 –21 –24 –27 –30
0
–3 –6 –9 –12 –15 –18 –21 –24 –27 –30
0
–3 –6 –9 –12 –15 –18 –21 –24 –27 –30
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
3015 G16
3015 G17
3015 G18
3015fb
8
LT3015 Series
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
LT3015-5 Quiescent Current
LT3015-12 Quiescent Current
LT3015-15 Quiescent Current
–2.4
–2.1
–1.8
–1.5
–1.2
–0.9
–0.6
–0.3
0
–2.4
–2.1
–1.8
–1.5
–1.2
–0.9
–0.6
–0.3
0
–2.4
–2.1
–1.8
–1.5
–1.2
–0.9
–0.6
–0.3
0
T = 25°C
T = 25°C
T = 25°C
J
J
J
V
= –5V
V
= –12V
V
= –15V
OUT
OUT
OUT
R
= ∞
R
= ∞
R = ∞
L
L
L
V
= V
V
= V
IN
SHDN
IN
SHDN
V
= V
IN
SHDN
V
= 0V
V
= 0V
V
= 0V
SHDN
SHDN
SHDN
0
–3 –6 –9 –12 –15 –18 –21 –24 –27 –30
0
–3 –6 –9 –12 –15 –18 –21 –24 –27 –30
0
–3 –6 –9 –12 –15 –18 –21 –24 –27 –30
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
3015 G19
3015 G20
3015 G21
LT3015 GND Pin Current
LT3015-2.5 GND Pin Current
LT3015-3 GND Pin Current
–25
–20
–15
–10
–5
–50
–45
–40
–35
–30
–25
–20
–15
–10
–5
–50
–45
–40
–35
–30
–25
–20
–15
–10
–5
T = 25°C
T = 25°C
J
T = 25°C
J
J
V
= V
V
= V
V
= V
SHDN
IN
SHDN
IN
= –3V
SHDN
IN
*FOR V
= –2.5V
*FOR V
*FOR V
= –1.22V
OUT
OUT
OUT
R
L
= 1.67Ω
R
L
= 2Ω
L
L
I
= –1.5A*
I
= –1.5A*
R = 30Ω
L
R
= 0.81Ω
L
= –1.5A*
I
L
R
L
= 25Ω
L
I
= –0.1A*
I = –0.1A*
L
R
L
= 2.4Ω
L
R
= 1.2kΩ
L
I
= –0.5A*
I
= –1mA*
L
R
L
= 5Ω
R = 2.5kΩ
L
I = –1mA*
L
L
R = 6Ω
L
I = –0.5A*
L
R
I
= 3kΩ
L
L
R
L
= 12Ω
I
= –0.5A*
L
= –1mA*
I
= –0.1A*
0
0
0
0
–1 –2 –3 –4 –5 –6 –7 –8 –9 –10
0
–1 –2 –3 –4 –5 –6 –7 –8 –9 –10
0
–1 –2 –3 –4 –5 –6 –7 –8 –9 –10
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
3015 G22
3015 G23
3015 G24
LT3015-3.3 GND Pin Current
LT3015-5 GND Pin Current
LT3015-12 GND Pin Current
–50
–45
–40
–35
–30
–25
–20
–15
–10
–5
–50
–45
–40
–35
–30
–25
–20
–15
–10
–5
–50
–45
–40
–35
–30
–25
–20
–15
–10
–5
T = 25°C
T = 25°C
T = 25°C
SHDN
J
J
J
V
= V
V
= V
V
= V
SHDN
IN
SHDN
IN
= –5V
IN
*FOR V
= –3.3V
*FOR V
*FOR V
= –12V
OUT
OUT
OUT
R
L
= 2.2Ω
L
R
L
= 8Ω
L
I
= –1.5A*
I
= –1.5A*
R
L
= 3.33Ω
L
R = 50Ω
L
I = –0.1A*
L
R
L
L
= 33Ω
I
= –1.5A*
R
= 12kΩ
L
I
= –0.1A*
R
L
= 120Ω
I = –1mA*
L
L
I
= –0.1A*
R
L
= 10Ω
R
I
= 24Ω
L
L
L
R
L
= 6.6Ω
R
L
= 3.3kΩ
R = 5kΩ
L
I = –1mA*
L
L
L
I
= –0.5A*
= –0.5A*
I
= –0.5A*
I
= –1mA*
0
0
0
0
–1 –2 –3 –4 –5 –6 –7 –8 –9 –10
0
–1 –2 –3 –4 –5 –6 –7 –8 –9 –10
0
–2 –4 –6 –8 –10 –12 –14 –16 –18 –20
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
3015 G25
3015 G26
3015 G27
3015fb
9
LT3015 Series
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
LT3015-15 GND Pin Current
GND Pin Current vs ILOAD
Positive SHDN Pin Thresholds
–50
–45
–40
–35
–30
–25
–20
–15
–10
–5
–35
–30
–25
–20
–15
–10
–5
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
T = 25°C
SHDN
V
V
= –2.3V
OUT
J
IN
TURN ON THRESHOLD
V
= V
= –1.22V
IN
*FOR V
= –15V
OUT
T = –55°C
J
R
L
= 10Ω
L
T = –40°C
J
I
= –1.5A*
TURN OFF THRESHOLD
R
L
= 150Ω
L
I
= –0.1A*
R
L
= 15kΩ
L
R
L
= 30Ω
L
I
= –1mA*
I
= –0.5A*
T = 25°C
J
T = 125°C
J
V
= –2.3V
IN
0
0
0
–2 –4 –6 –8 –10 –12 –14 –16 –18 –20
0.0 –0.2 –0.4 –0.6 –0.8 –1.0 –1.2 –1.4 –1.6
–75 –50 –25
0
25 50 75 100 125 150 175
INPUT VOLTAGE (V)
OUTPUT CURRENT (A)
TEMPERATURE (°C)
3015 G28
3015 G29
3015 G30
Negative SHDN Pin Thresholds
SHDN Pin Input Current
SHDN Pin Input Current
–1.4
–1.2
–1.0
–0.8
–0.6
–0.4
–0.2
0
25
20
15
10
5
24
21
18
15
12
9
V
IN
= –15V
V
= –30V
IN
TURN ON THRESHOLD
POSITIVE CURRENT FLOWS
INTO THE PIN
POSITIVE CURRENT FLOWS
INTO THE PIN
V
SHDN
= 15V
TURN OFF THRESHOLD
6
3
0
0
125°C
25°C
V
= –15V
SHDN
–5
–10
–3
–6
–55°C
V
= –2.3V
IN
–75 –50 –25
0
25 50 75 100 125 150 175
–30 –25 –20 –15 –10 –5
0
5
10 15 20 25
–75 –50 –25
0
25 50 75 100 125 150 175
TEMPERATURE (°C)
SHDN PIN VOLTAGE (V)
TEMPERATURE (°C)
3015 G31
3015 G32
3015 G33
ADJ Pin Bias Current
ADJ Pin Bias Current
Line Regulation
200
150
100
50
80
70
60
50
40
30
20
–20.0
–17.5
–15.0
–12.5
–10.0
–7.5
LT3015
LT3015-5
LT3015-12
LT3015-15
LT3015-2.5
LT3015-3
LT3015-3.3
0
–50
–100
–150
–200
–5.0
V
= –2.3V
T = 25°C
J
IN
–2.5
POSITIVE CURRENT FLOWS
INTO THE PIN
POSITIVE CURRENT FLOWS
INTO THE PIN
0.0
–75 –50 –25
0
25 50 75 100 125 150 175
0
–3 –6 –9 –12 –15 –18 –21 –24 –27 –30
–75 –50 –25
0
25 50 75 100 125 150 175
TEMPERATURE (°C)
–0.5V TO –30V
OUT(NOMINAL)
TEMPERATURE (°C)
INPUT VOLTAGE (V)
3015 G34
3015 G35
3015 G36
∆V = V
IN
(LT3015-2.5/-3/-3.3/-5/-12/-15)
∆V = –2.3V TO –30V (LT3015)
IN
I = –1mA
L
3015fb
10
LT3015 Series
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
Load Regulation
Current Limit vs VIN –VOUT
Current Limit vs Temperature
–2.2
–2.0
–1.8
–1.6
–1.4
–1.2
–1.0
–0.8
–0.6
–0.4
–0.2
0.0
–2.2
–2.0
–1.8
–1.6
–1.4
–1.2
–1.0
–0.8
–0.6
–0.4
–0.2
0.0
–80
–70
–60
–50
–40
–30
–20
–10
0
LT3015
LT3015-5
LT3015-12
LT3015-15
125°C
25°C
LT3015-2.5
LT3015-3
LT3015-3.3
–55°C
V
V
= –2.3V
= 0V
IN
OUT
V
= 0V
–5
OUT
0
–10
–15
–20
–25
–30
–75 –50 –25
0
25 50 75 100 125 150 175
–75 –50 –25
0
25 50 75 100 125 150 175
TEMPERATURE (°C)
–1V
OUT(NOMINAL)
INPUT/OUTPUT DIFFERENTIAL (V)
TEMPERATURE (°C)
3015 G39
3015 G37
3015 G38
V
= V
IN
(LT3015-2.5/-3/-3.3/-5/-12/-15)
V
= –2.3V (LT3015)
IN
∆I = –1mA TO –1.5A
L
LT3015 Input Ripple Rejection
LT3015 Input Ripple Rejection
Ripple Rejection vs Temperature
70
60
50
40
30
20
10
0
70
60
50
40
30
20
10
0
70
60
50
40
30
20
10
0
C
C
C
= 47µF, C = 10nF
FF
OUT
OUT
OUT
= 10µF, C = 10nF
FF
C
= 47µF
OUT
= 10µF, C = 0
FF
C
= 10µF
OUT
T = 25°C
J
T = 25°C
J
I = –1.5A
L
I = –1.5A
I = –1.5A
L
L
V
V
= –1.22V
V
OUT
V
= –1.22V
V
= –5V
OUT
OUT
IN
= –2.7V + 0.5V RIPPLE AT f = 120Hz
= –2.7V + 50V
RIPPLE
V
IN
= –6.5V + 50V
RIPPLE
RMS
P-P
IN
RMS
10
100
1k
10k
100k
1M
10M
–75 –50 –25
0
25 50 75 100 125 150 175
10
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
TEMPERATURE (°C)
FREQUENCY (Hz)
3015 G41
3015 G42
3015 G40
RMS Output Noise
vs Load Current
Minimum Input Voltage
Output Noise Spectral Density
–2.2
–2.0
–1.8
–1.6
–1.4
–1.2
–1.0
–0.8
–0.6
–0.4
–0.2
0
10
550
500
450
400
350
300
250
200
150
100
50
C
= 10µF
LT3015
LT3015-2.5
LT3015-5
LT3015-12
LT3015-15
LT3015-15
OUT
f = 10Hz TO 100kHz
= 100µA
I
FB-DIVIDER
I = –1.5A
L
I = –1mA
L
LT3015-12
V
= –5V
OUT
1
C
= 0
FF
V
C
= –5V
= 10nF
OUT
FF
LT3015-2.5
V
= –1.22V
OUT
V
= V
IN
SHDN
0.1
0
–75 –50 –25
0
25 50 75 100 125 150 175
10
100
= 10µF
1k
FREQUENCY (Hz)
10k
100k
–1m
–10m
–100m
–1
TEMPERATURE (°C)
LOAD CURRENT (A)
3015 G43
3015 G45
3015 G44
C
OUT
NOISE AT V
NOISE AT V
NOISE AT V
NOISE AT V
NOISE AT V
= –1.22V
= –5V, C = 0
= –5V, C = 100pF
= –5V, C = 1nF
OUT
OUT
OUT
OUT
OUT
I = –1.5A
L
FF
FF
FF
FF
I
= 100µA
FB-DIVIDER
= –5V, C = 10nF
3015fb
11
LT3015 Series
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
RMS Output Noise
LT3015 10Hz to 100kHz Output
Noise
LT3015 10Hz to 100kHz Output
Noise, CFF = 0
vs Feedforward Capacitor (CFF)
250
225
200
175
150
125
100
75
I = –1.5A
L
C
= 10µF
OUT
f = 10Hz TO 100kHz
I
= 100µA
T = 25°C
J
FB-DIVIDER
V
V
OUT
200µV/DIV
OUT
100µV/DIV
V
= –5V
OUT
V
= –1.22V
100p
OUT
50
25
0
3015 G48
3015 G47
C
V
I
= 10µF
= –5V
= –1.5A
1ms/DIV
C
V
I
= 10µF
= –1.22V
= –1.5A
1ms/DIV
10p
1n
10n
100n
1µ
OUT
OUT
OUT
OUT
FEEDFORWARD CAPACITANCE, C (F)
FF
L
L
3015 G46
C
= 0
FF
SHDN Transient Response,
IL = –5mA, CFF = 0
SHDN Transient Response,
IL = –1.5A, CFF = 0
LT3015 10Hz to 100kHz Output
Noise, CFF = 10nF
V
V
SHDN
1V/DIV
SHDN
1V/DIV
V
OUT
200µV/DIV
V
OUT
2V/DIV
= 3.3Ω
R
L
V
OUT
2V/DIV
R
= 1kΩ
L
3015 G50
3015 G51
3015 G49
C
V
C
= 10µF
= –5V
= 0
25ms/DIV
C
V
C
= 10µF
= –5V
= 0
250µs/DIV
C
V
I
= 10µF
= –5V
= –1.5A
1ms/DIV
OUT
OUT
FF
OUT
OUT
FF
OUT
OUT
L
C
= 10nF
FF
SHDN Transient Response,
IL = –1.5A, CFF = 10nF
LT3015 Transient Response,
COUT = 10µF
Start-Up Time vs CFF
100
10
I = –1.5A
L
V
= –12V
OUT
I
= 100µA
FB-DIVIDER
T = 25°C
J
V
SHDN
1V/DIV
V
OUT
100mV/DIV
V
= –15V
OUT
1.0
0.1
V
= –5V
OUT
V
OUT
I
2V/DIV
= 3.3Ω
OUT
V
= –3V
OUT
1A/DIV
R
L
0.01
V
= –1.22V
OUT
0.001
3015 G52
3015 G54
100p
1n
10n
100n
C
V
C
= 10µF
= –5V
= 10nF
250µs/DIV
C
V
V
= 10µF
= –1.22V
= –3V
25µs/DIV
OUT
OUT
FF
OUT
OUT
IN
FEEDFORWARD CAPACITOR, C (F)
FF
3015 G53
∆I
= –50mA TO –1.5A
OUT
3015fb
12
LT3015 Series
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
LT3015 Transient Response,
COUT = 47µF
LT3015 Transient Response,
CFF = 0, COUT = 10µF
V
V
OUT
100mV/DIV
OUT
100mV/DIV
I
OUT
1A/DIV
I
OUT
1A/DIV
3015 G55
3015 G56
C
V
V
= 47µF
= –1.22V
= –3V
25µs/DIV
C
V
V
C
= 10µF
= –5V
25µs/DIV
OUT
OUT
IN
OUT
OUT
IN
FF
= –6.5V
= 0
∆I
= –50mA TO –1.5A
OUT
I
= 100µA
FB-DIVIDER
∆I
= –50mA TO –1.5A
OUT
LT3015 Transient Response,
CFF = 10nF, COUT = 10µF
LT3015 Transient Response,
CFF = 10nF, COUT = 47µF
V
OUT
V
100mV/DIV
OUT
100mV/DIV
I
OUT
I
1A/DIV
OUT
1A/DIV
3015 G57
C
V
V
C
= 10µF
= –5V
25µs/DIV
OUT
OUT
IN
FF
3015 G58
C
V
V
C
= 47µF
= –5V
= –6.5V
= 10nF
25µs/DIV
OUT
OUT
IN
FF
= –6.5V
= 10nF
I
= 100µA
FB-DIVIDER
I = 100µA
∆I
= –50mA TO –1.5A
FB-DIVIDER
OUT
∆I
= –50mA TO –1.5A
OUT
3015fb
13
LT3015 Series
PIN FUNCTIONS (DFN/MSOP/Q/T)
IN (Pins 1, 2, Exposed Pad Pin 9 / 1, 2, 3, 4, Exposed
Pad Pin 13 / 3, Tab / 3, Tab ): Input. These pins supply
powertotheregulator. TheTaboftheDD-Pak, TO-220and
the exposed backside pad of the DFN and MSOP packages
is an electrical connection to IN and to the device’s sub-
strate. For proper electrical and thermal performance, tie
all IN pins together and tie IN to the exposed backside or
Tab of the relevant package on the PCB. See the Applica-
tions Information Section for thermal considerations and
calculating junction temperature. The LT3015 requires
a bypass capacitor at IN. In general, a battery’s output
impedance rises with frequency, so include a bypass ca-
pacitor in battery powered applications. An input bypass
capacitor in the range of 1µF to 10µF generally suffices,
but applications with large load transients may require
higher input capacitance to prevent input supply droop
and prevent the regulator from entering dropout.
It has a typical bias current of 30nA that flows into the
pin. The ADJ pin reference voltage is –1.22ꢁ referred to
GND, and the output voltage range is –1.22ꢁ to –29.5ꢁ. A
parasitic substrate diode exists between ADJ and IN of the
LT3015.Therefore,donotdriveADJmorethan0.3ꢁbelow
IN during normal operation or during a fault condition.
SENSE (Pin 6 / 8 / 4 / 4): Sense. For the fixed voltage ver-
sions of the LT3015 (LT3015-2.5/LT3015-3/LT3015-3.3/
LT3015-5/LT3015-12/LT3015-15),theSENSEpinconnects
to the non-inverting input of the error amplifier through
an internal resistor divider network. Optimum regulation
is obtained when the SENSE pin is connected to the OUT
pin of the regulator. In critical applications, small voltage
drops are caused by the resistance (R ) of PCB traces
P
between the regulator and the load. These drops can be
eliminated by connecting the SENSE pin to the output at
the load as shown in Figure 1 (Kelvin Sense Connection).
Note that the voltage drop across the external PCB traces
will add to the dropout voltage of the regulator. The SENSE
pin bias current is 100µA at the nominal output voltage. A
parasiticdiodeexistsbetweenSENSEandINoftheLT3015.
Therefore, do not drive SENSE more than 0.3ꢁ below IN
during normal operation or during a fault condition.
SHDN (Pin 3 / 5 / 1 / 1): Shutdown. Use the SHDN pin to
put the LT3015 into a micropower shutdown state. The
SHDN function is bi-directional, allowing use of either
positive or negative logic. The SHDN pin threshold volt-
ages are referenced to GND. The output of the LT3015 is
OFF if the SHDN pin is pulled typically within 0.ꢀ3ꢁ of
GND. Driving the SHDN pin typically more than 1.21ꢁ
turns the LT3015 ON. Drive the SHDN pin with either a
logicgateorwithopencollector/drainlogicusingapull-up
resistor. The resistor supplies the pull-up current of the
opencollector/draingate,typicallyseveralmicroamperes.
The typical SHDN pin current is 2.8µA out of the pin (for
negative logic) or 1ꢀµA into the pin (for positive logic). If
the SHDN function is unused, connect the SHDN pin to
OUT (Pins 7, 8 / 9, 10, 11, 12 / 5 / 5): Output. These
pins supply power to the load. Tie all OUT pins together
for best performance. Use a minimum output capacitor
of 10µF with an ESR less than 500mΩ to prevent oscil-
lations. Large load transient applications require larger
output capacitors to limit peak voltage transients. See
theApplicationsInformationsectionformoreinformation
on output capacitance. A parasitic substrate diode exists
betweenOUTandINoftheLT3015. Therefore, donotdrive
OUT more than 0.3ꢁ below IN during normal operation or
during a fault condition.
ꢁ to turn the device ON. If the SHDN pin is floated, then
IN
the LT3015 is OFF. A parasitic diode exists between SHDN
and IN of the LT3015. Therefore, do not drive the SHDN
pin more than 0.3ꢁ below IN during normal operation or
during a fault condition. The SHDN pin can also be used
to set a programmable undervoltage lockout (UꢁLO)
threshold for the regulator input supply.
R
P
GND
LT3015-XX
GND (Pins 4, 5 / 6, 7 / 2 / 2): Ground. Tie all GND pin(s)
together and tie the bottom of the output voltage setting
resistor divider directly to the GND pin(s) for optimum
load regulation performance.
LOAD
SHDN
SENSE
OUT
V
IN
R
P
IN
ADJ (Pin 6 / 8 / 4 / 4): Adjust. For the adjustable voltage
version,thispinistheerroramplifier’snon-invertinginput.
3015 F01
Figure 1. Kelvin Sense Connection
3015fb
14
LT3015 Series
BLOCK DIAGRAM
SENSE
R2*
OUT
*SEE TABLE 1 FOR
NOMINAL VALUES
OF R1 AND R2
ADJ
–
V
REF
1.21V
_
+
ERROR AMP
+
R1*
QPOWER
NPN DRIVER
SHDN
BIAS CIRCUITRY
+
I LIMIT AMP
–
+
R
SNS
–
V
–1.20V
TH
–
+
ADJ PIN BIAS CURRENT
COMPENSATION
I LIMIT FOLDBACK
GND
IN
3015 BD
APPLICATIONS INFORMATION
The LT3015 series are 1.5A negative low dropout linear
regulators 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
310mꢁ. Moreover, the low 1.1mA operating quiescent
current drops to less than 1µA 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 30ꢁ and still allow the LT3015 to
start up and operate.
GND
LT3015
C
R1
R2
IN
V
C
IN
OUT
SHDN
ADJ
V
OUT
IN
OUT
3015 F02
R2
R1
( )
R2
)
ADJ
ꢁOUT = –1.22ꢁ 1+
+ I
(
ꢁADJ = –1.22ꢁ ANDIADJ = 30nA AT 25°C
OUTPUT RANGE = –1.22 TO –29.5ꢁ
Figure 2. Adjustable Operation
Adjustable Operation
is zero. Curves of ADJ Pin ꢁoltage vs Temperature, ADJ
Pin Bias Current vs Temperature and ADJ Pin Bias Cur-
rent vs Input ꢁoltage appear in the Typical Performance
Characteristics section.
The LT3015 adjustable version has an output voltage
range of –1.22ꢁ to –29.3ꢁ. Output voltage is set by the
ratio of two external resistors as shown in Figure 2. The
deviceregulatestheoutputtomaintaintheADJpinvoltage
to –1.22ꢁ referred to ground. The current in R1 equals
–1.22ꢁ/R1 and the current in R2 equals the current in R1
plus the ADJ pin bias current. The ADJ pin bias current,
30nA at 25°C, flows into the ADJ pin. Calculate the output
voltage using the formula shown in Figure 1. The value
of R1 should be less than 50k to minimize errors in the
output voltage created by the ADJ pin bias current. Note
that in shutdown, the output is off and the divider current
The adjustable device is tested and specified with the
ADJ pin tied to the OUT pin for a –1.22ꢁ output voltage.
Specifications for output voltages greater than –1.22ꢁ are
proportional to the ratio of the desired ꢁ
to –1.22ꢁ
OUT
(ꢁ /–1.22ꢁ). For example, load regulation for an out-
OUT
put current change of –1mA to –1.5A is typically 2mꢁ at
ꢁ
OUT
= –1.22ꢁ. At ꢁ
= –5ꢁ, load regulation equals:
OUT
ꢀ (–5V/–1.22V)ꢀ•ꢀ(2mV)ꢀ=ꢀ8.2mV
3015fb
15
LT3015 Series
APPLICATIONS INFORMATION
Table 1 shows 1% resistor divider values for some com-
mon output voltages with a resistor divider current of
approximately 100µA.
to –1.22ꢁ output voltage performance regardless of the
chosen output voltage (see Transient Response and Output
Noise in the Typical Performance Characteristics section).
It is important to note that the start-up time is affected by
theuseofafeedforwardcapacitor. Start-uptimeisdirectly
proportional to the size of the feedforward capacitor and
the output voltage, and is inversely proportional to the
feedback resistor divider current. In particular, it slows
to 860µs with a 10nF feedforward capacitor and a 10µF
output capacitor for an output voltage set to –5ꢁ by a
100µA feedback resistor divider current.
Table 1. Output Voltage Resistor Divider Values
VOUT
(V)
R1
(kΩ)
R2
(kΩ)
–2.5
12.1
12.1
12.1
12.1
12.1
12.4
12.ꢀ
1ꢀ.8
20.5
3ꢀ.4
10ꢀ
–3.0
–3.3
–5.0
–12.0
–15.0
140
GND
Feedforward Capacitance: Output Voltage Noise,
Transient Performance, and PSRR
C
C
OUT
R1
R2
IN
LT3015
The LT3015 regulators provide low output voltage noise
over the 10Hz to 100kHz bandwidth while operating at
full load current. Output voltage noise is approximately
240nꢁ/√Hzoverthisfrequencywhileoperatinginunity-gain
configuration. For higher output voltages (using a resistor
divider), the output voltage noise gains up accordingly. To
lower the output voltage noise for higher output voltages,
SHDN
ADJ
OUT
V
C
FF
IN
V
IN
OUT
3015 F03
C
I
≥ 10nF/100µA • I
FB-DIVIDER
FF
= V /(R1+R2)
FB-DIVIDER
OUT
Figure 3. Feedforward Capacitor for Fast Transient
Response, Low Noise, and High PSRR
include a feedforward capacitor (C ) from ꢁ
to ꢁ
.
FF
OUT
ADJ
A good quality, low leakage, capacitor is recommended.
Thiscapacitorbypassestheresistordividernetworkathigh
frequencies; and hence, reduces the output noise. With
the use of a 10nF feedforward capacitor, the output noise
Output Capacitance and Transient Performance
The LT3015 regulators are stable with a wide range of
output capacitors. The ESR of the output capacitor affects
stability, most notably with small capacitors. Use a mini-
mum output capacitor of 10µF with an ESR of 500mΩ or
less to prevent oscillations. The LT3015’s load transient
response is a function of output capacitance. Larger val-
ues of output capacitance decrease the peak deviations
and provide improved transient response for larger load
current changes.
decreases from 220µꢁ
to ꢀ0µꢁ
when the output
RMS
RMS
voltage is set to –5ꢁ by a 100µA feedback resistor divider.
Higher values of output voltage noise are often measured
if care is not exercised with regard to circuit layout and
testing. Crosstalk from nearby traces induces unwanted
noise onto the LT3015’s output. Moreover, power supply
ripple rejection (PSRR) must also be considered, as the
LT3015 does not exhibit unlimited PSRR; and thus, a
small portion of the input noise propagates to the output.
Extra consideration must be given to the use of ceramic
capacitors. Ceramic capacitors are manufactured with a
variety of dielectrics, each with different behavior across
temperature and applied voltage. The most common
dielectrics used are specified with EIA temperature char-
acteristic codes of Z5U, Y5ꢁ, X5R, and XꢀR. The Z5U and
Y5ꢁ dielectrics are good for providing high capacitances
in a small package, but they tend to have strong voltage
Using a feedforward capacitor (C ) from ꢁ
to ꢁ has
ADJ
FF
OUT
theaddedbenefitofimprovingtransientresponseandPSRR
foroutputvoltagesgreaterthan–1.22ꢁ.Withnofeedforward
capacitor, the response and settling times will increase as
the output voltage is raised above –1.22ꢁ. Use the equa-
tion in Figure 3 to determine the minimum value of C to
FF
achieve a transient (and noise) performance that is similar
and temperature coefficients as shown in Figures 4 and 5.
3015fb
16
LT3015 Series
APPLICATIONS INFORMATION
When used with a 5ꢁ regulator, a 16ꢁ 10μF Y5ꢁ capacitor
can exhibit an effective value as low as 1μF to 2μF for the
DCbiasvoltageappliedandovertheoperatingtemperature
range. The X5R and XꢀR dielectrics result in more stable
characteristics and are more suitable for use as the output
capacitor. The XꢀR type has better stability across tem-
perature,whiletheX5Rislessexpensiveandisavailablein
highervalues.CarestillmustbeexercisedwhenusingX5R
and XꢀR capacitors; the X5R and XꢀR codes only specify
operating temperature range and maximum capacitance
change over temperature. Capacitance change due to DC
bias with X5R and XꢀR capacitors is better than Y5ꢁ and
Z5U capacitors, but can still be significant enough to drop
capacitorvaluesbelowappropriatelevels.CapacitorDCbias
characteristics tend to improve as component case size
increases, but expected capacitance at operating voltage
should be verified in situ for all applications.
ꢁoltage and temperature coefficients are not the only
sources of problems. Some ceramic capacitors have a
piezoelectric response. A piezoelectric device generates
voltage across its terminals due to mechanical stress,
similar to the way a piezoelectric microphone works. For
a ceramic capacitor, the stress can be induced by vibra-
tions in the system or thermal transients. The resulting
voltages produced can cause appreciable amounts of
noise. A ceramic capacitor produced the trace in Figure 6
inresponsetolighttappingfromapencil.Similarvibration
induced behavior can masquerade as increased output
voltage noise.
V
OUT
1mV/DIV
20
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10µF
0
X5R
3015 F06
V
C
L
= –1.3V
= 10µF
1ms/DIV
OUT
OUT
–20
I = 10µA
–40
Figure 6. Noise Resulting from Tapping on a Ceramic Capacitor
–60
Y5V
–80
Overload Recovery
–100
Like many IC power regulators, the LT3015 has safe oper-
ating area protection. The safe operating area protection
activates at IN-to-OUT differential voltages greater than
8ꢁ. The safe area protection decreases current limit as
the IN-to-OUT differential voltage increases and keeps
the power transistor inside a safe operating region for
all values of forward input-to-output voltage up to the
LT3015’s Absolute Maximum Ratings.
0
2
4
6
10
12 14 16
8
DC BIAS VOLTAGE (V)
3015 F04
Figure 4. Ceramic Capacitor DC Bias Characteristics
40
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10µF
20
X5R
0
–20
When power is first applied and input voltage rises, the
outputfollowstheinputandkeepstheIN-to-OUTdifferential
voltagesmall,allowingtheregulatortosupplylargeoutput
currents and start-up into high current loads. With a high
input voltage, a problem can occur wherein removal of
an output short does not allow the output voltage to fully
recover. Other LTC negative linear regulators such as the
LT11ꢀ5 and LT1964 also exhibit this phenomenon, so it
is not unique to the LT3015.
–40
Y5V
–60
–80
–100
–50 –25
0
25
75 100 125
50
TEMPERATURE (°C)
3015 F05
Figure 5. Ceramic Capacitor Temperature Characteristics
3015fb
17
LT3015 Series
APPLICATIONS INFORMATION
The problem occurs with a heavy output load when input
voltage is high and output voltage is low. Such situations
occur easily after the removal of a short-circuit or if the
shutdown pin is pulled high after the input voltage has
already been turned on. The load line for such a load
intersects the output current curve at two points. If this
happens, the regulator has two stable output operating
points. With this double intersection, the input power
supply may need to be cycled down to zero and brought
up again to make the output recover.
The LT3015 regulators incorporate a thermal shutdown
circuit designed to protect the device during overload
conditions. The typical thermal shutdown temperature is
165°C and the circuit incorporates about 8°C of hyster-
esis. For continuous normal conditions, do not exceed the
maximum junction temperature rating of 125°C. Carefully
consider all sources of thermal resistance from junction
to ambient, including other heat sources mounted in close
proximity to the LT3015.
The undersides of the DFN and MSOP packages have ex-
posed metal from the lead frame to the die attachment.
Both packages allow heat to directly transfer from the
die junction to the printed circuit board metal to control
maximumoperatingjunctiontemperature.Thedual-in-line
pin arrangement allows metal to extend beyond the ends
of the package on the topside (component side) of the
PCB. Connect this metal to IN on the PCB. The multiple
IN and OUT pins of the LT3015 also assist in spreading
heat to the PCB.
Shutdown/UVLO
The SHDN pin is used to put the LT3015 into a micropower
shutdown state. The LT3015 has an accurate –1.20ꢁ
threshold(duringturn-on)ontheSHDNpin.Thisthreshold
can be used in conjunction with a resistor divider from the
system input supply to define an accurate undervoltage
lockout (UꢁLO) threshold for the regulator. The SHDN pin
current (at the threshold) needs to be considered when
determining the resistor divider network.
For surface mount devices, heat sinking is accomplished
by using the heat spreading capabilities of the PC board
and its copper traces. Copper board stiffeners and plated
through-holes can also be used to spread the heat gener-
ated by power devices.
Thermal Considerations
The LT3015’s maximum rated junction temperature of
125°Climitsitspowerhandlingcapability.Twocomponents
comprise the power dissipated by the device:
Tables 2-4 list thermal resistance as a function of copper
area in a fixed board size. All measurements were taken
in still air on a 4 layer FR-4 board with 1oz solid internal
planesand2oztop/bottomexternaltraceplaneswithatotal
boardthicknessof1.6mm.Thefourlayerswereelectrically
isolated with no thermal vias present. PCB layers, copper
weight, board layout and thermal vias will affect the resul-
tant thermal resistance. For more information on thermal
resistance and high thermal conductivity test boards,
refer to JEDEC standard JESD51, notably JESD51-12 and
JESD51-ꢀ. Achieving low thermal resistance necessitates
attention to detail and careful PCB layout.
1. Output current multiplied by the input-to-output dif-
ferential voltage: I ꢀ•ꢀ(V - ꢁ ) and
OUT
IN
OUT
2. GND pin current multiplied by the input voltage:
ꢀ•ꢀV
I
GND
IN
Determine GND pin current using the GND Pin Current
curves in the Typical Performance Characteristics sec-
tion. Total power dissipation is the sum of the above two
components.
3015fb
18
LT3015 Series
APPLICATIONS INFORMATION
Thus:
Table 2. Measured Thermal Resistance for DFN Package
COPPER AREA
ꢀ Pꢀ=ꢀ–500mA(–3.465Vꢀ+ꢀ2.5V)ꢀ+ꢀ–6.5mAꢀ•ꢀ(–3.465V)ꢀ=ꢀ
BOARD
AREA
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
40°C/W
TOP SIDE*
BACKSIDE
0.505W
2
2
2
2
2
2
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
Using a DFN package, the thermal resistance is in the
rangeof40°C/Wto42°C/Wdependingonthecopperarea.
Therefore, the junction temperature rise above ambient
approximately equals:
2
2
1000mm
2500mm
40°C/W
2
2
225mm
2500mm
41°C/W
2
2
100mm
2500mm
42°C/W
*Device is mounted on topside
ꢀ 0.505Wꢀ•ꢀ41°C/Wꢀ=ꢀ20.7°C
The maximum junction temperature equals the maxi-
mum ambient temperature plus the maximum junction
temperature rise above ambient or:
Table 3. Measured Thermal Resistance for MSOP Package
COPPER AREA
BOARD
AREA
THERMAL RESISTANCE
TOP SIDE*
BACKSIDE
(JUNCTION-TO-AMBIENT)
2
2
2
2
2
2
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
3ꢀ°C/W
3ꢀ°C/W
38°C/W
40°C/W
T
= 85°C + 20.ꢀ°C = 105.ꢀ°C
JMAX
2
2
1000mm
2500mm
2
2
Protection Features
225mm
2500mm
2
2
100mm
2500mm
The LT3015 incorporates several protection features that
make it ideal for use in battery-powered applications. In
addition to the normal protection features associated
with monolithic regulators, such as current limiting and
thermal limiting, the device protects itself against reverse
input voltages and reverse output voltages.
*Device is mounted on topside
Table 4. Measured Thermal Resistance for DD-Pak Package
COPPER AREA
BOARD
AREA
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
TOP SIDE*
BACKSIDE
2
2
2
2
2
2500mm
2500mm
2500mm
2500mm
2500mm
14°C/W
16°C/W
19°C/W
Precision current limit and thermal overload protections
are intended to protect the LT3015 against current over-
load conditions at the output of the device. For normal
operation, do not allow the the junction temperature to
exceed 125°C.
2
2
1000mm
2500mm
2
2
225mm
2500mm
*Device is mounted on topside
T Package, 5-Lead TO-220
Pulling the LT3015’s output above ground induces no
damage to the part. If IN is left open circuit or grounded,
OUTcanbepulledaboveGNDby30ꢁ.Inaddition,OUTacts
like an open circuit, i.e. no current flows into the pin. If IN
is powered by a voltage source, OUT sinks the LT3105’s
short-circuitcurrentandprotectsitselfbythermallimiting.
In this case, grounding the SHDN pin turns off the device
and stops OUT from sinking the short-circuit current.
Thermal Resistance (Junction-to-Case) = 3°C/W
Calculating Junction Temperature
Example:Givenanoutputvoltageof–2.5ꢁ,aninputvoltage
range of –3.3ꢁ 5%, an output current range of 1mA to
500mA, and a maximum ambient temperature of 85°C,
what is the maximum junction temperature?
The power dissipated by the LT3015 equals:
I
ꢀ•ꢀ(V
- ꢁ ) + I ꢀ•ꢀ(V
)
OUT(MAX)
IN(MAX)
OUT
GND
IN(MAX)
where:
I
= –500mA
= –3.465ꢁ
OUT(MAX)
ꢁ
IN(MAX)
I
at (I = –500mA, ꢁ = –3.465ꢁ) = –6.5mA
OUT IN
GND
3015fb
19
LT3015 Series
TYPICAL APPLICATIONS
Adjustable Current Sink
R1
2k
R8
100k
GND
C1
10µF
R2
82.5k
C2
LT3015
10µF
LT1004-1.2
SHDN
ADJ
OUT
R3
2k
R4
0.01Ω
R
LOAD
IN
V
< –2.3V
IN
R5
2.2k
R6
2.2k
R7
475Ω
C3
1µF
2 –
8
1/2
1
3 +LT1350
4
C4
3.3µF
3015 TA04
NOTE: ADJUST R3 FOR 0 TO –1.5A CONSTANT CURRENT
3015fb
20
LT3015 Series
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
DD Package
8-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1698 Rev C)
0.70 ±0.05
3.5 ±0.05
2.10 ±0.05 (2 SIDES)
1.65 ±0.05
PACKAGE
OUTLINE
0.25 ±0.05
0.50
BSC
2.38 ±0.05
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
R = 0.125
0.40 ±0.10
TYP
5
8
3.00 ±0.10
(4 SIDES)
1.65 ±0.10
(2 SIDES)
PIN 1
TOP MARK
(NOTE 6)
(DD8) DFN 0509 REV C
4
1
0.25 ±0.05
0.75 ±0.05
0.200 REF
0.50 BSC
2.38 ±0.10
BOTTOM VIEW—EXPOSED PAD
0.00 – 0.05
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON TOP AND BOTTOM OF PACKAGE
3015fb
21
LT3015 Series
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
MSE Package
12-Lead Plastic MSOP, Exposed Die Pad
(Reference LTC DWG # 05-08-1666 Rev F)
BOTTOM VIEW OF
EXPOSED PAD OPTION
2.845 ±0.102
2.845 ±0.102
(.112 ±.004)
0.889 ±0.127
(.035 ±.005)
(.112 ±.004)
1
6
0.35
REF
1.651 ±0.102
(.065 ±.004)
5.23
(.206)
MIN
1.651 ±0.102
(.065 ±.004)
3.20 – 3.45
(.126 – .136)
0.12 REF
DETAIL “B”
CORNER TAIL IS PART OF
THE LEADFRAME FEATURE.
FOR REFERENCE ONLY
NO MEASUREMENT PURPOSE
DETAIL “B”
12
7
0.65
(.0256)
BSC
0.42 ±0.038
4.039 ±0.102
(.159 ±.004)
(NOTE 3)
(.0165 ±.0015)
TYP
0.406 ±0.076
RECOMMENDED SOLDER PAD LAYOUT
(.016 ±.003)
12 11 10 9 8 7
REF
DETAIL “A”
0.254
(.010)
3.00 ±0.102
(.118 ±.004)
(NOTE 4)
0° – 6° TYP
4.90 ±0.152
(.193 ±.006)
GAUGE PLANE
0.53 ±0.152
(.021 ±.006)
1
2 3 4 5 6
DETAIL “A”
0.86
(.034)
REF
1.10
(.043)
MAX
0.18
(.007)
SEATING
PLANE
0.22 – 0.38
(.009 – .015)
TYP
0.1016 ±0.0508
(.004 ±.002)
MSOP (MSE12) 0911 REV F
0.650
(.0256)
BSC
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
6. EXPOSED PAD DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH ON E-PAD SHALL
NOT EXCEED 0.254mm (.010") PER SIDE.
3015fb
22
LT3015 Series
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
Q Package
5-Lead Plastic DD Pak
(Reference LTC DWG # 05-08-1461 Rev F)
.060
(1.524)
TYP
.390 – .415
(9.906 – 10.541)
.060
(1.524)
.165 – .180
(4.191 – 4.572)
.256
(6.502)
.045 – .055
(1.143 – 1.397)
15° TYP
+.008
.004
–.004
.060
(1.524)
.059
(1.499)
TYP
.183
(4.648)
.330 – .370
(8.382 – 9.398)
+0.203
–0.102
0.102
(
)
.095 – .115
(2.413 – 2.921)
.075
(1.905)
DETAIL A
.067
(1.702)
BSC
.050 .012
(1.270 0.305)
.300
(7.620)
.013 – .023
(0.330 – 0.584)
+.012
.143
–.020
.028 – .038
+0.305
BOTTOM VIEW OF DD PAK
HATCHED AREA IS SOLDER PLATED
COPPER HEAT SINK
3.632
(0.711 – 0.965)
(
)
–0.508
TYP
DETAIL A
0° – 7° TYP
0° – 7° TYP
.420
.276
.080
.420
.350
.325
.585
.205
.320
.585
.090
.042
.090
.067
.042
.067
RECOMMENDED SOLDER PAD LAYOUT
NOTE:
1. DIMENSIONS IN INCH/(MILLIMETER)
2. DRAWING NOT TO SCALE
RECOMMENDED SOLDER PAD LAYOUT
FOR THICKER SOLDER PASTE APPLICATIONS
Q(DD5) 0811 REV F
3015fb
23
LT3015 Series
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
T Package
5-Lead Plastic TO-220 (Standard)
(Reference LTC DWG # 05-08-1421)
.165 – .180
(4.191 – 4.572)
.147 – .155
(3.734 – 3.937)
DIA
.390 – .415
(9.906 – 10.541)
.045 – .055
(1.143 – 1.397)
.230 – .270
(5.842 – 6.858)
.570 – .620
(14.478 – 15.748)
.620
(15.75)
TYP
.460 – .500
(11.684 – 12.700)
.330 – .370
(8.382 – 9.398)
.700 – .728
(17.78 – 18.491)
.095 – .115
(2.413 – 2.921)
SEATING PLANE
.152 – .202
(3.861 – 5.131)
.155 – .195*
(3.937 – 4.953)
.260 – .320
(6.60 – 8.13)
.013 – .023
(0.330 – 0.584)
.067
BSC
.135 – .165
(3.429 – 4.191)
.028 – .038
(0.711 – 0.965)
(1.70)
* MEASURED AT THE SEATING PLANE
T5 (TO-220) 0801
3015fb
24
LT3015 Series
REVISION HISTORY
REV
DATE
12/11 Revised entire data sheet to include fixed output voltages.
4/12 Clarified conditions of “RMS Output Noise vs Load Current” graph
DESCRIPTION
PAGE NUMBER
A
1 - 26
11
B
3015fb
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
25
LT3015 Series
TYPICAL APPLICATION
Paralleling Regulators For Higher Output Current
R9
12.1k
GND
C1
C2
1%
SHDN
ADJ
OUT
22µF
22µF
R8
37.4k
1%
R1
0.01Ω
LT3015
V
OUT
–5V
V
< –5.5V
IN
IN
–3.0A
R7
12.1k
1%
GND
SHDN
ADJ
R6
41.2k
1%
R5
50k
R2
0.01Ω
LT3015
IN
OUT
C3
0.01µF
R3
2.2k
R4
2.2k
2
3
8
–
1
1/2
LT1366
+
4
3015 TA03
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PART NUMBER
LT1185
DESCRIPTION
COMMENTS
6ꢀ0mꢁ Dropout ꢁoltage, ꢁ = –4.3ꢁ to –35ꢁ, DD-Pak and TO-220 Packages
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LT3080/LT3080-1 1.1A, Parallelable, Low Noise, Low
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300mꢁ Dropout ꢁoltage (2-Supply Operation), Low Noise: 40µꢁ
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ꢁ
: 0ꢁ to 35.ꢀꢁ, Current-Based Reference with 1-Resistor ꢁ
set; Directly Parallelable
OUT
OUT
(no op amp required), Stable with Ceramic Caps, TO-220, DD-Pak, SOT-223, MSOP-8E and
3mm × 3mm DFN Packages; “–1” ꢁersion has Integrated Internal Ballast Resistor
LT3085
500mA, Parallelable, Low Noise,
Low Dropout Linear Regulator
2ꢀ5mꢁ Dropout ꢁoltage (2-Supply Operation), Low Noise: 40µꢁ
, ꢁ : 1.2ꢁ to 36ꢁ, ꢁ
:
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3015fb
LT 0412 REV B • PRINTED IN USA
26 LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-ꢀ41ꢀ
●
●
LINEAR TECHNOLOGY CORPORATION 2011
(408) 432-1900 FAX: (408) 434-050ꢀ www.linear.com
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