LT1185CQ#PBF_技术文档

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

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

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

SHDN

SENSE

DFN/MSOP

V

OUT

–5V

–1.5A

IN

OUT

–5.5V TO

–30V

3015 TA01

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

1

2

3

4

5

6

IN

12 OUT

11 OUT

10 OUT

IN

1

2

3

4

8

7

6

5

OUT

13

IN

9

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

5

4

3

2

1

OUT

5

4

3

2

1

OUT

SENSE/ADJ*

IN

SENSE/ADJ*

IN

TAB IS IN

GND

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

–55°C to 125°C

–40°C to 125°C

–55°C to 125°C

–40°C to 125°C

–55°C to 125°C

–40°C to 125°C

–55°C to 125°C

–40°C to 125°C

–55°C to 125°C

–40°C to 125°C

–55°C to 125°C

–40°C to 125°C

–55°C to 125°C

LT3015EDD#PBF

LT3015EDD#TRPBF

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

LGDK

LT3015EDD-3.3#PBF

LT3015IDD-3.3#PBF

LT3015EDD-5#PBF

LT3015IDD-5#PBF

LGDM

LGDN

LT3015EDD-12#PBF

LT3015IDD-12#PBF

LT3015EDD-15#PBF

LT3015IDD-15#PBF

LT3015EMSE#PBF

LGDP

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

30153

301533

30155

301512

301515

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 TO-220

TEMPERATURE RANGE

–40°C to 125°C

–55°C to 125°C

–40°C to 125°C

–55°C to 125°C

–40°C to 125°C

–55°C to 125°C

–40°C to 125°C

–55°C to 125°C

–40°C to 125°C

–55°C to 125°C

–40°C to 125°C

–55°C to 125°C

–40°C to 125°C

–55°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-3

LT3015Q-3.3

LT3015Q-5

LT3015Q-12

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-3

LT3015ET-3.3#PBF

LT3015IT-3.3#PBF

LT3015ET-5#PBF

LT3015IT-5#PBF

LT3015T-3.3

LT3015T-5

LT3015ET-12#PBF

LT3015IT-12#PBF

LT3015ET-15#PBF

LT3015IT-15#PBF

LT3015T-12

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 ^Thel denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T_A= 25°C.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Minimum IN Pin Voltage

(Notes 2, 12)

I

= –0.5A

= –1.5A

–1.8

V

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

–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

IN

l

LT3015-2.5: –30V < V < –3.5V, –1.5A < I

< –1mA

IN

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

–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

–15

IN

LOAD

LT3015-12: –30V < V < –13V, –1.5A < I

< –1mA

IN

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

IN

l

LT3015: –30V < V < –2.3V, –1.5A < I

< –1mA

LOAD

IN

l

LT3015-2.5: ∆V = –3.0V to –30V, I

= –1mA

LOAD

4

4.5

5

12

15

16

20

27

6

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

IN

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

3

6

18

mV

IN

LOAD

= –1mA to –1.5A

l

LT3015-2.5: V = –3.5V, ∆I

IN

LT3015-3: V = –4V, ∆I

4

7.5

23

IN

LOAD

LT3015-3: V = –4V, ∆I

IN

LT3015-3.3: V = –4.3V, ∆I

= –1mA to –1.5A

= –1mA to –1.5A (Note 2)

5

10.5

25

IN

LOAD

LT3015-3.3: V = –4.3V, ∆I

IN

LT3015-5: V = –6V, ∆I

5.5

13

16

2

10.5

26

IN

LOAD

LT3015-5: V = –6V, ∆I

IN

LT3015-12: V = –13V, ∆I

25

IN

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

LT3015: V = –2.3V, ∆I

IN

Dropout Voltage

= V

I

= –1mA

0.055

0.1

0.095

0.16

0.24

0.23

0.32

0.27

0.39

0.5

V

LOAD

l

V

(Notes 4, 5)

OUT(NOMINAL)

= –1mA

IN

= –100mA

= –500mA (DFN/MSOP)

= –500mA (DD-PAK/TO-220)

= –1.5A (DFN/MSOP)

= –1.5A (DD-PAK/TO-220)

0.17

0.2

0.31

0.41

0.51

0.68

l

GND Pin Current

= V

I

= 0mA

1.1

1.15

2.9

9.5

35

2.4

2.5

7

23

70

mA

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 ^Thel denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T_A= 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

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

–1.06

0.73

–0.73

–0.5

l

SHDN Pin Current (Note 8)

V

SHDN

V

SHDN

V

SHDN

= 0V

= 15V

= –15V

–1

0

1

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

51

48

43

40

55

62

61

58

53

50

65

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

LT3015-12: V = –13.5V (Avg)

LT3015-15: V = –16.5V (Avg)

LT3015: V = –2.5V (Avg) (Note 2)

IN

l

Current Limit (Note 14)

V

= –2.3V, V

= 0V

OUT

1.7

2

2.3

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

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

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 ^T_A^{= 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

–0.2 –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

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

= –6V (LT3015/-2.5/-3/-3.3/-5)

= –16V (LT3015-12/-15)

IN

L

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)

3015 G07

3015 G09

3015 G08

3015fb

7

LT3015 Series

TYPICAL PERFORMANCE CHARACTERISTICS ^T_A^{= 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

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)

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)

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

J

V

= –2.5V

V

= –3V

V

= –3.3V

OUT

R

= ∞

R

= ∞

R = ∞

L

V

= V

IN

SHDN

V

= V

IN

SHDN

V

= V

IN

SHDN

V

= 0V

V

= 0V

V

= 0V

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)

3015 G16

3015 G17

3015 G18

3015fb

8

LT3015 Series

TYPICAL PERFORMANCE CHARACTERISTICS ^T_A^{= 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

J

V

= –5V

V

= –12V

V

= –15V

OUT

R

= ∞

R

= ∞

R = ∞

L

V

= V

V

= V

IN

SHDN

IN

SHDN

V

= V

IN

SHDN

V

= 0V

V

= 0V

V

= 0V

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)

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

J

T = 25°C

J

V

= V

V

= V

V

= V

SHDN

IN

SHDN

IN

= –3V

SHDN

IN

*FOR V

= –2.5V

*FOR V

= –1.22V

OUT

R

L

= 1.67Ω

R

L

= 2Ω

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

R = 6Ω

L

I = –0.5A*

L

R

I

= 3kΩ

L

R

L

= 12Ω

I

= –0.5A*

L

= –1mA*

I

= –0.1A*

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)

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

SHDN

J

V

= V

V

= V

V

= V

SHDN

IN

SHDN

IN

= –5V

IN

*FOR V

= –3.3V

*FOR V

= –12V

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

= 33Ω

I

= –1.5A*

R

= 12kΩ

L

I

= –0.1A*

R

L

= 120Ω

I = –1mA*

L

I

= –0.1A*

R

L

= 10Ω

R

I

= 24Ω

L

R

L

= 6.6Ω

R

L

= 3.3kΩ

R = 5kΩ

L

I = –1mA*

L

I

= –0.5A*

I

= –0.5A*

I

= –1mA*

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)

3015 G25

3015 G26

3015 G27

3015fb

9

LT3015 Series

TYPICAL PERFORMANCE CHARACTERISTICS ^T_A^{= 25°C, unless otherwise noted.}

LT3015-15 GND Pin Current

GND Pin Current vs I_LOAD

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

= –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

–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

–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

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

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 ^T_A^{= 25°C, unless otherwise noted.}

Load Regulation

Current Limit vs V_IN–V_OUT

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

= –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

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

= 47µF, C = 10nF

FF

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

L

V

= –1.22V

V

OUT

V

= –1.22V

V

= –5V

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

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

= –1.22V

= –5V, C = 0

= –5V, C = 100pF

= –5V, C = 1nF

OUT

I = –1.5A

L

FF

I

= 100µA

FB-DIVIDER

= –5V, C = 10nF

3015fb

11

LT3015 Series

TYPICAL PERFORMANCE CHARACTERISTICS ^T_A^{= 25°C, unless otherwise noted.}

RMS Output Noise

LT3015 10Hz to 100kHz Output

Noise

LT3015 10Hz to 100kHz Output

Noise, C_FF= 0

vs Feedforward Capacitor (C_FF)

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

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

FEEDFORWARD CAPACITANCE, C (F)

FF

L

3015 G46

C

= 0

FF

SHDN Transient Response,

I_L= –5mA, C_FF= 0

SHDN Transient Response,

I_L= –1.5A, C_FF= 0

LT3015 10Hz to 100kHz Output

Noise, C_FF= 10nF

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

FF

OUT

FF

OUT

L

C

= 10nF

FF

SHDN Transient Response,

I_L= –1.5A, C_FF= 10nF

LT3015 Transient Response,

C_OUT= 10µF

Start-Up Time vs C_FF

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

= 10µF

= –1.22V

= –3V

25µs/DIV

OUT

FF

OUT

IN

FEEDFORWARD CAPACITOR, C (F)

FF

3015 G53

∆I

= –50mA TO –1.5A

OUT

3015fb

12

LT3015 Series

TYPICAL PERFORMANCE CHARACTERISTICS ^T_A^{= 25°C, unless otherwise noted.}

LT3015 Transient Response,

C_OUT= 47µF

LT3015 Transient Response,

C_FF= 0, C_OUT= 10µF

V

OUT

100mV/DIV

OUT

100mV/DIV

I

OUT

1A/DIV

I

OUT

1A/DIV

3015 G55

3015 G56

C

V

= 47µF

= –1.22V

= –3V

25µs/DIV

C

V

C

= 10µF

= –5V

25µs/DIV

OUT

IN

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,

C_FF= 10nF, C_OUT= 10µF

LT3015 Transient Response,

C_FF= 10nF, C_OUT= 47µF

V

OUT

V

100mV/DIV

OUT

100mV/DIV

I

OUT

I

1A/DIV

OUT

1A/DIV

3015 G57

C

V

C

= 10µF

= –5V

25µs/DIV

OUT

IN

FF

3015 G58

C

V

C

= 47µF

= –5V

= –6.5V

= 10nF

25µs/DIV

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 ANDI_ADJ= 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

V_OUT

(V)

R1

(kΩ)

R2

(kΩ)

–2.5

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

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

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

–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

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

1000mm

2500mm

40°C/W

2

225mm

2500mm

41°C/W

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

2500mm

3ꢀ°C/W

38°C/W

40°C/W

T

= 85°C + 20.ꢀ°C = 105.ꢀ°C

JMAX

2

1000mm

2500mm

2

Protection Features

225mm

2500mm

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

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

1000mm

2500mm

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

(.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

.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

R8

37.4k

1%

R1

0.01Ω

LT3015

V

OUT

–5V

V

< –5.5V

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

RELATED PARTS

PART NUMBER

LT1185

DESCRIPTION

COMMENTS

6ꢀ0mꢁ Dropout ꢁoltage, ꢁ = –4.3ꢁ to –35ꢁ, DD-Pak and TO-220 Packages

3A, Negative Linear Regulator

IN

LT11ꢀ5

500mA, Negative Low Dropout

Micropower Regulator

500mꢁ Dropout ꢁoltage, ꢁ = –4.5ꢁ to –20ꢁ, S8, N8, SOT-223, DD-Pak and TO-220

IN

Packages

LT1964

LT1ꢀ64A

LT1ꢀ63

LT1963A

LT1965

LT3022

200mA, Negative Low Noise Low Dropout

Regulator

340mꢁ Dropout ꢁoltage, Low Noise: 30µꢁ

ThinSOT Packages

, ꢁ = –1.9ꢁ to –20ꢁ, 3mm × 3mm DFN and

RMS IN

3A, Fast Transient Response, Low Noise

LDO Regulator

340mꢁ Dropout ꢁoltage, Low Noise: 40µꢁ

, ꢁ = 2.ꢀꢁ to 20ꢁ, TO-220 and

RMS IN

DD-Pak Packages, “A” ꢁersion Stable also with Ceramic Caps

500mA, Low Noise, LDO Regulator

300mꢁ Dropout ꢁoltage, Low Noise : 20µꢁ

Output Capacitors, S8 and 3mm × 4mm DFN Packages

, ꢁ = 1.6ꢁ to 20ꢁ, Stable with 3.3µF

RMS IN

1.5A Low Noise, Fast Transient Response 340mꢁ Dropout ꢁoltage, Low Noise: 40µꢁ

LDO Regulator

, ꢁ = 2.5ꢁ to 20ꢁ, “A” ꢁersion Stable with

RMS IN

Ceramic Caps, TO-220, DD-Pak, SOT-223 and SO-8 Packages

1.1A, Low Noise, LDO Regulator

310mꢁ Dropout ꢁoltage, Low Noise: 40µꢁ , ꢁ : 1.8ꢁ to 20ꢁ, ꢁ : 1.2ꢁ to 19.5ꢁ,

RMS IN

OUT

Stable with Ceramic Caps, TO-220, DD-Pak, MSOP-8E and 3mm × 3mm DFN Packages

1A, Low ꢁoltage, ꢁery Low Dropout ꢁ

Linear Regulator

ꢁ = 0.9ꢁ to 10ꢁ, Dropout ꢁoltage: 145mꢁ Typical, Adjustable Output (ꢁ = ꢁ

IN REF OUT(MIN)

LDO

= 200mꢁ), Fixed Output ꢁoltages: 1.2ꢁ, 1.5ꢁ, 1.8ꢁ, Stable with Low ESR, Ceramic Output

Capacitors 16-Pin 3mm × 5mm DFN and MSOP-16E Packages

LT3080/LT3080-1 1.1A, Parallelable, Low Noise, Low

Dropout Linear Regulator

300mꢁ Dropout ꢁoltage (2-Supply Operation), Low Noise: 40µꢁ

, ꢁ : 1.2ꢁ to 36ꢁ,

RMS IN

ꢁ

: 0ꢁ to 35.ꢀꢁ, Current-Based Reference with 1-Resistor ꢁ

set; Directly Parallelable

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, ꢁ

:

RMS IN

OUT

0ꢁ to 35.ꢀꢁ, Current-Based Reference with 1-Resistor ꢁ

set; Directly Parallelable (no op

OUT

amp required), Stable with Ceramic Caps, MSOP-8E and 2mm × 3mm DFN Packages

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


型号：	LT1185CQ#PBF
厂家：	Linear
描述：	LT1185 - Low Dropout Regulator; Package: DD PAK; Pins: 5; Temperature Range: 0°C to 70°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

LT1185CQ#PBF [Linear]

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