ST LM137, LM337 User Manual

LM137

LM337

Three-terminal adjustable negative voltage regulators

Features

■Output voltage adjustable down to VREF

■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	TO-220	TO-3
	■ Standard 3-lead transistor packages
	■ Excellent thermal regulation: 0.002%/V
	■ 50 ppm/°C temperature coefficient

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.

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

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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
VI - VO	Input output voltage differential					40			V
IO	Output current					1.5			A
PD	Power dissipation					Internally limited
TSTG	Storage temperature range						- 65 to 150		°C
TOP	Operating junction temperature range		LM137				- 55 to 150		°C
			LM337				0 to 125
Note:	Absolute maximum ratings are those values beyond which damage to the device may occur.
	Functional operation under these condition is not implied.
Table 3.	Thermal data
Symbol		Parameter		TO-220			TO-3	Unit
RthJC		Thermal resistance junction-case max.		3			4	°C/W
RthJA		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
VREF		Reference voltage	|VI - VO| = 3 to 40 V, TJ = Tmin to Tmax					-1.2	-1.25	-1.3	V
			|IO| = 10mA to |IO(max)| P ≤ Pmax
K		Line regulation (1)	Ta = 25°C				IO = 0.1 A		0.01	0.02	%/V
	VI		|VI - VO| = 3 to 40 V				IO = 20 mA		0.01	0.02
KVO		Load regulation (1)	Ta = 25°C				|VO| ≤ 5 V		15	25	mV
			|IO| = 10mA to |IO(max)|				|VO| ≥ 5 V		0.3	0.5	%
		Thermal regulation	Ta = 25°C, pulse 10 ms						0.002	0.02	%/W
IADJ		Adjustment pin current							65	100	µA
IADJ		Adjustment pin current	Ta = 25°C, |IO| = 10 mA to |IO(max)|						2	5	µA
		change	|VI - VO| = 3 to 40 V
K		Line regulation (1)	|V	I	- V | = 3 to 40 V				0.02	0.05	%/V
	VI				O
K		Load regulation (1)	|I		| = 10mA to |I	|	|VO| ≤ 5 V		20	50	mV
	VO
			O		O(max)		|VO| ≥ 5 V		0.3	1	%
|IO(min)|		Minimum load current	|VI - VO| ≤ 40 V						2.5	5	mA
			|VI - VO| ≤ 10 V						1.2	3
IOS		Short circuit output current	|VI - VO| ≤ 15 V					1.5	2.2		A
			|VI - VO| = 40 V, TJ =25°C					0.24	0.4
VNO		RMS output noise	Ta = 25°C, f = 10 Hz to 10 kHz						0.003		%
		(% of VO)
RVF		Ripple rejection ratio	VO = -10 V, f = 120 Hz						60		dB
			CADJ = 10 µF					66	77
KVT		Temperature stability							0.6		%
KVH		Long term stability	Ta = 125°C, 1000 H						0.3	1	%

1.Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered under the specification for thermal regulation.

TJ = 0 to 150 °C unless otherwise specified.

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