ST LM137, LM337 User Manual

Features

LM137
LM337

Three-terminal adjustable negative voltage regulators

■ Output voltage adjustable down to V

■

1.5 A guaranteed output current

■ 0.3%/V typical load regulation

■ 0.01%/V typical line regulation

■ Current limit constant with temperature

■ Ripple rejection: 77 dB

■ Standard 3-lead transistor packages

■ Excellent thermal regulation: 0.002%/V

■ 50 ppm/°C temperature coefficient

REF

Description

The LM137 series are adjustable 3-terminal
negative voltage regulators capable of supplying
in excess -1.5 A over a -1.2 to -37 V output
voltage range. They are exceptionally easy to use
and require only two external resistors to set the
output voltage. Further, both line and load
regulation are better than standard fixed
regulators. Also, LM137 regulators are supplied in
standard transistor packages which are easily
mounted and handled. In addition to higher
performance than fixed regulators, the LM137
series offer full overload protection available only
in integrated circuits. Included on the chip are
current limit, thermal overload protection and safe
area protection. All overload protection circuitry
remains fully functional even if the adjustment
terminal is disconnected.

TO-220

TO-3

Table 1. Device summary

Part numbers Order codes Packages Temperature range

LM137 LM137K TO-3 - 55 °C to 150 °C

LM337 LM337K TO-3 0 °C to 125 °C

LM337 LM337SP TO-220 0 °C to 125 °C

October 2011 Doc ID 2167 Rev 4 1/18

www.st.com

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Contents LM137, LM337

Contents

1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

6 Thermal regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

7 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

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LM137, LM337 Diagram

1 Diagram

Figure 1. Schematic diagram

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Pin configuration LM137, LM337

2 Pin configuration

Figure 2. Pin connections (top view)

TO-220

TO-3

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LM137, LM337 Maximum ratings

3 Maximum ratings

Table 2. Absolute maximum ratings

Symbol Parameter Value Unit

- VOInput output voltage differential 40 V

V

I

I

P

T

STG

T

OP

Note: Absolute maximum ratings are those values beyond which damage to the device may occur.

Table 3. Thermal data

Output current 1.5 A

O

Power dissipation Internally limited

D

Storage temperature range - 65 to 150 °C

Operating junction temperature range

LM137 - 55 to 150

LM337 0 to 125

Functional operation under these condition is not implied.

°C

Symbol Parameter TO-220 TO-3 Unit

R

R

thJC

thJA

Thermal resistance junction-case max. 3 4 °C/W

Thermal resistance junction-ambient max. 70 35 °C/W

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Electrical characteristics LM137, LM337

4 Electrical characteristics

TJ = -55 to 150 °C, VI - VO = 5 V, IO = 0.5 A unless otherwise specified.

Table 4. Electrical characteristics of LM137

Symbol Parameter Test conditions Min. Typ. Max. Unit

Ta = 25°C -1.225 -1.25 -1.275

V

K

I

ΔI

K

|I

O(min)

V

R

K

K

1. Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output

Reference voltage

REF

K

VI

VO

Line regulation

Load regulation

(1)

(1)

Thermal regulation T

Adjustment pin current 65 100 µA

ADJ

Adjustment pin current

ADJ

change

K

VI

VO

Line regulation

Load regulation

(1)

(1)

| Minimum load current

I

Short circuit output current

OS

RMS output noise

NO

(% of V

Ripple rejection ratio

VF

Temperature stability 0.6 %

VT

Long term stability Ta = 125°C, 1000 H 0.3 1 %

VH

voltage due to heating effects are covered under the specification for thermal regulation.

)

O

|V

- VO| = 3 to 40 V, TJ = T

I

|IO| = 10mA to |I

O(max)

| P ≤ P

Ta = 25°C

- VO| = 3 to 40 V

|V

I

Ta = 25°C
|IO| = 10mA to |I

= 25°C, pulse 10 ms 0.002 0.02 %/W

a

O(max)

|

Ta = 25°C, |IO| = 10 mA to |I
|VI - VO| = 3 to 40 V

to T

min

max

max

-1.2 -1.25 -1.3

IO = 0.1 A 0.01 0.02

= 20 mA 0.01 0.02

I

O

| ≤ 5 V 15 25 mV

|V

O

| ≥ 5 V 0.3 0.5 %

|V

O

|

O(max)

25µA

|VI - VO| = 3 to 40 V 0.02 0.05 %/V

|VO| ≤ 5 V 20 50 mV

|IO| = 10mA to |I

|V

- VO| ≤ 40 V 2.5 5

I

- VO| ≤ 10 V 1.2 3

|V

I

|V

- VO| ≤ 15 V 1.5 2.2

I

- VO| = 40 V, TJ =25°C 0.24 0.4

|V

I

= 25°C, f = 10 Hz to 10 kHz 0.003 %

T

a

V

= -10 V, f = 120 Hz 60

O

= 10 µF 66 77

C

ADJ

O(max)

|

| ≥ 5 V 0.3 1 %

|V

O

V

%/V

mA

A

dB

= 0 to 150 °C unless otherwise specified.

T

J

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