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FEATURES

LT3015 Series

1.5A, Low Noise,

Negative Linear Regulator

with Precision Current Limit

DESCRIPTION

The LT

3015 series are low noise, low dropout, negative

linear regulators with fast transient response. The devices

supply up to 1.5A of output current at a typical dropout

voltage of 310mV. Operating quiescent current is typically

1.1mA and drops to < 1µA in shutdown. Quiescent current

is also well controlled in dropout. In addition to fast tran-

sient response, the LT3015 series exhibit very low output

noise, making them ideal for noise sensitive applications.

The LT3015 regulators are stable with a minimum 10µF

output capacitor. Moreover, the regulator can use small

ceramic capacitors without the necessary addition of ESR

as is common with other regulators. Internal protection

circuitry includes reverse output protection, precision cur-

rent limit with foldback and thermal limit with hysteresis.

The LT3015 regulators are available in fixed output volt-

ages of –2.5V, –3V, –3.3V, –5V, –12V and –15V and as an

adjustable device with a –1.22V reference voltage. Pack-

ages include the 5-lead TO-220 and DD-Pak, a thermally

enhanced 12-lead MSOP and the low profile (0.75 mm)

8-lead 3mm

3mm DFN.

LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property

of their respective owners.

Output Current: 1.5A

Dropout Voltage: 310mV

Precision Current Limit with Foldback

Low Output Noise: 60µV

RMS

(10Hz to 100kHz)

Low Quiescent Current: 1.1mA

Precision Positive or Negative Shutdown Logic

Fast Transient Response

Wide Input Voltage Range: –1.8V to –30V

Adjustable Output Voltage Range: –1.22V to –29.3V

Fixed Output Voltages: –2.5V, –3V, –3.3V, –5V, –12V, –15V

Controlled Quiescent Current in Dropout

<1µA Quiescent Current in Shutdown

Stable with 10µF Output Capacitor

Stable with Ceramic, Tantalum or Aluminum Capacitors

Thermal Limit with Hysteresis

Reverse Output Protection

5-Lead TO-220 and DD-Pak, Thermally Enhanced

12-Lead MSOP and 8-Lead 3mm

3mm

0.75mm

DFN Packages

APPLICATIONS

Post-Regulator for Switching Supplies

Negative Logic Supplies

Low Noise Instrumentation

Industrial Supplies

Negative Complement to the LT1963A

TYPICAL APPLICATION

–5V, –1.5A, Low Noise Regulator

GND

10µF

LT3015-5

SHDN

–5.5V TO

–30V

SENSE

10µF

OUT

–5V

–1.5A

DROPOUT VOLTAGE (mV)

Dropout Voltage

450

400

350

300

250

200

150

100

–0.2 –0.4 –0.6 –0.8 –1.0 –1.2 –1.4 –1.6

LOAD CURRENT (A)

3015 TA01a

3015fb

= 25°C

DD-PAK/TO-220

DFN/MSOP

OUT

3015 TA01

LT3015 Series

ABSOLUTE MAXIMUM RATINGS

(Note 1)

IN Pin Voltage .........................................................±33V

OUT Pin Voltage (Note 10) ......................................±33V

OUT to IN Differential Voltage (Note 10) ........–0.3V, 33V

SENSE Pin Voltage

(with Respect to IN Pin) (Note 10) .................–0.3V, 33V

ADJ Pin Voltage

(with Respect to IN Pin) (Note 10) .................–0.3V, 33V

SHDN

Pin Voltage

(with Respect to IN Pin) (Note 10) .................–0.3V, 55V

SHDN

Pin Voltage

(with Respect to GND Pin) ..............................–33V, 22V

Output Short-Circuit Duration .......................... Indefinite

Operating Junction Temperature Range (Note 9)

E-, I-Grade ........................................ –40°C to 125°C

MP-Grade ......................................... –55°C to 125°C

Storage Temperature Range .................. –65°C to 150°C

Lead Temperature (Soldering, 10Sec)

MS12E Package ................................................ 300°C

Q, T Packages ................................................... 250°C

PIN CONFIGURATION

TOP VIEW

SHDN

GND

8 OUT

7 OUT

6 SENSE/ADJ*

5 GND

SHDN

GND

TOP VIEW

OUT

SENSE/ADJ*

GND

DD PACKAGE

8-LEAD (3mm

3mm) PLASTIC DFN

JMAX

= 125°C,

= 40°C/W,

= 7.5°C/W

EXPOSED PAD (PIN 9) IS IN, MUST BE SOLDERED TO PCB

*PIN 6 = SENSE FOR LT3015-2.5/-3/-3.3/-5/-12/-15

*PIN 6 = ADJ FOR LT3015

FRONT VIEW

TAB IS IN

OUT

SENSE/ADJ*

GND

SHDN

MSE PACKAGE

12-LEAD PLASTIC MSOP

JMAX

= 125°C,

= 37°C/W,

= 10°C/W

EXPOSED PAD (PIN 13) IS IN, MUST BE SOLDERED TO PCB

*PIN 8 = SENSE FOR LT3015-2.5/-3/-3.3/-5/-12/-15

*PIN 8 = ADJ FOR LT3015

FRONT VIEW

TAB IS IN

T PACKAGE

5-LEAD PLASTIC TO-220

JMAX

= 125°C,

= 50°C/W,

= 3°C/W

*PIN 4 = SENSE FOR LT3015-2.5/-3/-3.3/-5/-12/-15

*PIN 4 = ADJ FOR LT3015

OUT

SENSE/ADJ*

GND

SHDN

Q PACKAGE

5-LEAD PLASTIC DD-PAK

JMAX

= 125°C,

= 14°C/W,

= 3°C/W

*PIN 4 = SENSE FOR LT3015-2.5/-3/-3.3/-5/-12/-15

*PIN 4 = ADJ FOR LT3015

3015fb

LT3015 Series

ORDER INFORMATION

LEAD FREE FINISH

LT3015EDD#PBF

LT3015IDD#PBF

LT3015EDD-2.5#PBF

LT3015IDD-2.5#PBF

LT3015EDD-3#PBF

LT3015IDD-3#PBF

LT3015EDD-3.3#PBF

LT3015IDD-3.3#PBF

LT3015EDD-5#PBF

LT3015IDD-5#PBF

LT3015EDD-12#PBF

LT3015IDD-12#PBF

LT3015EDD-15#PBF

LT3015IDD-15#PBF

LT3015EMSE#PBF

LT3015IMSE#PBF

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

TAPE AND REEL

LT3015EDD#TRPBF

LT3015IDD#TRPBF

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

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

PART MARKING*

LFXS

LGDJ

LGDK

LGDM

LGDN

LGDP

LGDQ

3015

301525

30153

301533

30155

301512

301515

PACKAGE DESCRIPTION

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

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

3015fb

LT3015 Series

ORDER INFORMATION

LEAD FREE FINISH

LT3015EQ#PBF

LT3015IQ#PBF

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

LT3015IT#PBF

LT3015ET-2.5#PBF

LT3015IT-2.5#PBF

LT3015ET-3#PBF

LT3015IT-3#PBF

LT3015ET-3.3#PBF

LT3015IT-3.3#PBF

LT3015ET-5#PBF

LT3015IT-5#PBF

LT3015ET-12#PBF

LT3015IT-12#PBF

LT3015ET-15#PBF

LT3015IT-15#PBF

TAPE AND REEL

LT3015EQ#TRPBF

LT3015IQ#TRPBF

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

LT3015IT#TRPBF

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

PART MARKING*

LT3015Q

LT3015Q-2.5

LT3015Q-3

LT3015Q-3.3

LT3015Q-5

LT3015Q-12

LT3015Q-15

LT3015T

LT3015T-2.5

LT3015T-3

LT3015T-3.3

LT3015T-5

LT3015T-12

LT3015T-15

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

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

LT3015 Series

The

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

= 25°C.

PARAMETER

Minimum IN Pin Voltage

(Notes 2, 12)

CONDITIONS

LOAD

= –0.5A

LOAD

= –1.5A

ELECTRICAL CHARACTERISTICS

MIN

TYP

–1.8

MAX

–2.3

–2.525

–2.55

–3.03

–3.06

–3.333

–3.366

–5.05

–5.1

–12.12

–12.24

–15.15

–15.3

–1.232

–1.244

7.5

10.5

3.8

0.095

0.16

0.24

0.23

0.32

0.27

0.39

0.5

0.51

0.68

2.4

2.5

130

UNITS

µV

RMS

µA

3015fb

Regulated Output Voltage (Note 3) LT3015-2.5: V

= –3.0V, I

LOAD

= –1mA

LT3015-2.5: –30V < V

< –3.5V, –1.5A < I

LOAD

< –1mA

LT3015-3: V

= –3.5, I

LOAD

= –1mA

LT3015-3: –30V < V

< –4 V, –1.5A < I

LOAD

< –1mA

LT3015-3.3: V

= –3.8, I

LOAD

= –1mA

LT3015-3.3: –30V < V

< –4.3V, –1.5A < I

LOAD

< –1mA

LT3015-5: V

= –5.5, I

LOAD

= –1mA

LT3015-5: –30V < V

< –6V, –1.5A < I

LOAD

< –1mA

LT3015-12: V

= –12.5, I

LOAD

= –1mA

LT3015-12: –30V < V

< –13V, –1.5A < I

LOAD

< –1mA

LT3015-15: V

= –15.5, I

LOAD

= –1mA

LT3015-15: –30V < V

< –16V, –1.5A < I

LOAD

< –1mA

ADJ Pin Voltage (Notes 2, 3)

Line Regulation

LT3015: V

= –2.3V, I

LOAD

= –1mA

LT3015: –30V < V

< –2.3V, –1.5A < I

LOAD

< –1mA

LT3015-2.5: ∆V

= –3.0V to –30V, I

LOAD

= –1mA

LT3015-3: ∆V

= –3.5V to –30V, I

LOAD

= –1mA

LT3015-3.3: ∆V

= –3.8V to –30V, I

LOAD

= –1mA

LT3015-5: ∆V

= –5.5V to –30V, I

LOAD

= –1mA

LT3015-12: ∆V

= –12.5V to –30V, I

LOAD

= –1mA

LT3015-15: ∆V

= –15.5V to –30V, I

LOAD

= –1mA

LT3015: ∆V

= –2.3V to –30V, I

LOAD

= –1mA (Note 2)

LT3015-2.5: V

= –3.5V, ∆I

LOAD

= –1mA to –1.5A

LT3015-2.5: V

= –3.5V, ∆I

LOAD

= –1mA to –1.5A

LT3015-3: V

= –4V, ∆I

LOAD

= –1mA to –1.5A

LT3015-3: V

= –4V, ∆I

LOAD

= –1mA to –1.5A

LT3015-3.3: V

= –4.3V, ∆I

LOAD

= –1mA to –1.5A

LT3015-3.3: V

= –4.3V, ∆I

LOAD

= –1mA to –1.5A

LT3015-5: V

= –6V, ∆I

LOAD

= –1mA to –1.5A

LT3015-5: V

= –6V, ∆I

LOAD

= –1mA to –1.5A

LT3015-12: V

= –13V, ∆I

LOAD

= –1mA to –1.5A

LT3015-12: V

= –13V, ∆I

LOAD

= –1mA to –1.5A

LT3015-15: V

= –16V, ∆I

LOAD

= –1mA to –1.5A

LT3015-15: V

= –16V, ∆I

LOAD

= –1mA to –1.5A

LT3015: V

= –2.3V, ∆I

LOAD

= –1mA to –1.5A (Note 2)

LT3015: V

= –2.3V, ∆I

LOAD

= –1mA to –1.5A (Note 2)

LOAD

= –1mA

LOAD

= –1mA

LOAD

= –100mA

LOAD

= –100mA

LOAD

= –500mA (DFN/MSOP)

LOAD

= –500mA (DFN/MSOP)

LOAD

= –500mA (DD-PAK/TO-220)

LOAD

= –500mA (DD-PAK/TO-220)

LOAD

= –1.5A (DFN/MSOP)

LOAD

= –1.5A (DFN/MSOP)

LOAD

= –1.5A (DD-PAK/TO-220)

LOAD

= –1.5A (DD-PAK/TO-220)

LOAD

= 0mA

LOAD

= –1mA

LOAD

= –100mA

LOAD

= –500mA

LOAD

= –1.5A

LT3015: C

OUT

= 10µF I

LOAD

= –1.5A, BW = 10Hz to 100kHz, V

OUT

= –1.22V

–2.475

–2.45

–2.97

–2.94

–3.267

–3.234

–4.95

–4.9

–11.88

–11.76

–14.85

–14.7

–1.208

–1.196

–2.5

–3

–3.3

–5

–12

–15

–1.22

4.5

5.5

2.5

Load Regulation

5.5

Dropout Voltage

= V

OUT(NOMINAL)

(Notes 4, 5)

0.055

0.1

0.17

0.2

0.31

0.41

GND Pin Current

= V

OUT(NOMINAL)

(Notes 4, 6)

1.1

1.15

2.9

9.5

100

Output Voltage Noise (Note 2)

SENSE Pin Bias Current (Note 13) LT3015-2.5/-3/-3.3/-5/-12/-15