LM337T - Fairchild Semiconductor Corporation

KA337 / LM337 — 3-Terminal 1.5 A Negative Adjust able Regulator

KA337 / LM337 Rev. 1.1.0 1

July 2013

KA337 / LM337

3-Terminal 1.5 A Negative Adjustable Regulator

Features

• Output-Current in Excess of 1.5 A

• Output-Adjustable Between -1.25 V and -37 V

• Internal Thermal Overload Protection

• Internal Short-Circuit Current Limiting

• Output-Transistor Safe Area Compensation

• Floating Operation for High-Voltage Applications

• Standard 3-Pin TO-220 Package

Ordering Information

Block Diagram

Figure 1. Block Diagram

Product Number Package Packing Method Operating Temperature

KA337TU TO-220 (Dual Gauge) Rail 0°C to +125°C

LM337T TO-220 (Single Gauge)

Voltage

Reference

Protection

Circuitry

Output

Input

adj

Description

The KA337 / LM337 are 3-terminal negative adjustable

regulators. They supply in excess of 1.5 A over an output

voltage range of -1.25 V to -37 V. These regulators

require only two external resistors to set the output volt-

age and employ cu rren t limit ing , the r ma l ov erl oa d prot ec -

tion, and safe area compensation.

TO-220

1. Adj 2. Input 3. Output

Input

KA337 / LM337 — 3-Terminal 1.5 A Negative Adjust able Regulator

KA337 / LM337 Rev. 1.1.0 2

Absolute Maximum Ratings

Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-

ble above the re co mmen ded operating co nd iti ons an d s tres si ng the parts to these levels i s n ot re co mmended. In addi-

tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The

absolute maximum ratings are stress ratings only. Values are at TA = 25°C unless otherwise noted.

Electrical Characteristics

VI - VO = 5 V, IO = 40 mA, 0°C ≤ TJ ≤ +125°C, PDMAX = 20 W; unless otherwise specified.

Notes:

1. Load and l ine regulati on are spec ified at con stant junctio n tempera ture. Change i n VO due to heating effects must be

taken into account separately. Pulse testing with low duty is used.

2. CADJ, when used, is connected between the adjustment pi n and ground.

Symbol Parameter Value Unit

IVI - VOI Input-Output Voltage Differential 40 V

PDPower Dissipation Internally Limited W

RθJC Thermal Resistance, Junction to Case 4 °C/W

TOPR Operating Temperature Range 0 to +125 °C

TSTG Storage Temperature Range -65 to +125 °C

Symbol Parameter Conditions Min. Typ. Max. Unit

Rline Line Regulation(1) TA = +25°C,

3 V ≤ I VI - VO I ≤ 40 V 0.01 0.04 %/ V

3 V ≤ I VI - VO I ≤ 40 V 0.02 0.07

Rload Load Regulation(1) TA = +25°C,

10 mA ≤ IO ≤ 0.5 A 15 50 mV

10 mA ≤ IO ≤ 1.5 A 15 150

IADJ Adjustable Pin Current 50 100 μA

ΔIADJ Adjustab le Pin Curre nt Chan ge TA = +25°C,

10 mA ≤ IO ≤ 1.5 A,

3 V ≤ I VI - VO I ≤ 40 V 25μA

VREF Reference Voltage TA =+25°C -1.213 -1.250 -1.287 V

3 V ≤ I VI - VO I ≤ 40 V,

10 mA ≤ IO ≤ 1.5 A -1.200 -1.250 -1.300

STTTemperature Stability 0°C ≤ Tj ≤ +125°C 0.6 %

IL(MIN) Minimum Load Current to Maintain

Regulation 3 V ≤ I VI - VO I ≤ 40 V 2.5 10.0 mA

3 V ≤ I VI - VO I ≤ 10 V 1.5 6.0

eNRMS Noise, % of VOUT TA =+25°C,

10 Hz ≤ f ≤ 10 kHz 0.003 %

RR Ripple Rejection Ratio VO = -10 V, f = 120 Hz 60 dB

CADJ = 10 μF(2) 66 77

ST Long-Term Stability TJ = 125°C, 1000 Hours 0.3 1.0 %

KA337 / LM337 — 3-Terminal 1.5 A Negative Adjust able Regulator

KA337 / LM337 Rev. 1.1.0 3

Typical Performance Characteristics

Figure 2. Line Regulation vs. Temperature Figure 3. Load Regulations vs. Temperature

Figure 4. Adjustable Pin Current vs. Temperature Figure 5. Adjustable Pin Current Change

vs. Temperature

Figure 6. Reference Voltage vs. Temperature Figure 7. Minimum Load Current vs. Temperature

0.00

0.01

0.02

0.03

0.04

0.05

0.06

0.07

-40 -20 0 20 40 60 80 100 120

VIN = -8 V to -45 V

IO = 4 mA

VOUT = -5 V

Datasheet specs at 25 oC [%]

Min: -

Typ: 0.01

Max: 0.04

TA - Temperature[oC]

RLINE - Line Regulatoion (%)

-40 -20 0 20 40 60 80 100 120

IO = 10 mA to 0.5 A

IO = 10 mA to 1.5 A

VIN = -6.25 V

VOUT = -1.25 V

IO = 10 mA to 1.5 V

Datasheet specs at 25 oC [%]

Min: -

Typ: 15 mV

Max: 50 mV

TA - Temper at ure[oC]

RLoad - Load Regulatoion (mV)

100

-40 -20 0 20 40 60 80 100 120

VI - VO = 5 V

IO = 40 mA

Datasheet specs at 25 oC [%]

Min: -

Typ: 50 μA

Max: 100 μA

TA - Temper at ure[oC]

IADJ - Adjustable Pin Current (μA)

-40 -20 0 20 40 60 80 100 120

Datsheet specs at 25 oC

Min:

Typ: 2 μA

Max: 5 μA

VI - VO = 3 V to 40 V

IO = 10 mA to 1.5 V

VI - VO = 3 V to 40 V, IO = 10 mA

VI - VO = 3 V to 40 V, IO = 1.5 A

VI - VO = 3 V, IO = 10 mA to 1.5 A

VI - VO = 40 V, IO = 10 mA to 1.5 A

TA - Temper at ure[oC]

IADJ - Adjustable Pin Current (μA)

1.20

1.22

1.24

1.26

1.28

1.30

-40 -20 0 20 40 60 80 100 120

Datsheet specs at 25 oC

Min: 1.213 V

Typ: 1.25 V

Max: 1.287 V

VI - VO = 3 V to 40 V

IO = 10 mA to 1.5 V

VI - VO = 3 V, IO = 10 mA

VI - VO = 3 V, IO = 1.5 A

VI - VO = 5 V, IO = 40 mA

VI - VO = 40 V, IO = 10 mA

VI - VO = 40 V, IO = 1.5 A

TA - Temper at ure[oC]

IADJ - Adjustable Pin Current (μA)

-40 -20 0 20 40 60 80 100 120

Datsheet specs

Min:

Typ: 2.5 mA

Max: 10 mA

VI - VO = 3 V to 40 V V = 3 V

VI - VO = 10 V

VI - VO = 40 V

TA - Temper at ure[oC]

ILMIN - Minimum Load Current [ mA]

KA337 / LM337 — 3-Terminal 1.5 A Negative Adjust able Regulator

KA337 / LM337 Rev. 1.1.0 4

Typical Performance Characteristics

Figure 8. Noise Voltage vs. Temperature Figure 9. Ripple Rejection vs. Temperature

Figure 10. Short-Circuit Currents vs. Temperature Figure 11. Peak Current vs. Temperature

-40 -20 0 20 40 60 80 100 120

w/o CADJ

with C ADJ

VOUT = -10 V

CADJ = 10 μF

Datasheet specs w/o CADJ

Min:

Typ: 60 dB

Max:

with CADJ

Min: 66 dB

Typ: 77 dB

Max:

TA - Temper at ure[oC]

RR - Ripple Rejection Ratio (dB)

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

-40 -20 0 20 40 60 80 100 120

VI - VO = 40 V

VOUT = GND Test specs at 25 oC [%]

Min: 0.08 A

Typ: 0.25 A

Max: 0.9 A

TA - Temper at ure[oC]

ISCC - Short Circuit Current (A)

1.5

2.0

2.5

3.0

3.5

-40 -20 0 20 40 60 80 100 120

Test specs at 25 oC

Min: 1.5 A

Typ: 2.5 A

Max: 3.5 A

VI - VO = 5 V

TA - Temper at ure[oC]

IADJ - Adjustable Pin Current (μA)

KA337 / LM337 — 3-Terminal 1.5 A Negative Adjust able Regulator

KA337 / LM337 Rev. 1.1.0 5

Typical Application

Figure 12. Typical Application

Notes:

3. CI is required if regulator is located more then 4 inches from power supply filter.

1.0 μF solid tantalum or 10 μF aluminum electrolytic is recommended.

4. CO is necessary for stability. 1.0 μF solid tantalum or 10 μF aluminum electrolytic is recommended.

VO = -1.25 V (1 + R2 / R1).

-V

+Co

(4)

(3)

Iadj

PROG

Vadj

KA337 / LM337

120

KA337 / LM337 — 3-Terminal 1.5 A Negative Adjust able Regulator

KA337 / LM337 Rev. 1.1.0 6

Physical Dimensions

Figure 13. TO220, MOLDED, 3-LEAD, JEDEC, VARIATION AB

Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner

without notic e. Please note the revisi on and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or

obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the

warranty therein, which covers Fairchild produ cts.

Always visit Fairchild Semiconduct or’s online packaging are a for the most recent package drawings :

http://www.fairchildsemi.com/dwg/TO/TO220B03.pdf.

For current tape an d reel specifications, visit Fair child Semiconductor’s online pac kaging area:

http://www.fairchildsemi.com/packing_dwg/PKG-TO220B03.pdf.

TO-220 [ SINGLE GAUGE ]

KA337 / LM337 — 3-Terminal 1.5 A Negative Adjust able Regulator

KA337 / LM337 Rev. 1.1.0 7

Physical Dimensions (Continued)

Figure 14. TO220, MOLDED, 3-LEAD, NON-JEDEC, VARIATION AB

Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner

without notic e. Please note the revisi on and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or

obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the

warranty therein, which covers Fairchild produ cts.

Always visit Fairchild Semiconduct or’s online packaging are a for the most recent package drawings :

http://www.fairchildsemi.com/dwg/TO/TO220Y03.pdf.

For current tape an d reel specifications, visit Fair child Semiconductor’s online pac kaging area:

http://www.fairchildsemi.com/packing_dwg/PKG-TO220Y03.pdf.

TO-220 [ DUAL GAUGE ]

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Rev. I64