MOTOROLA LM337T2, LM337AT, LM337AD2TR4, LM337AD2T, LM337D2TR4 Datasheet

Order this document by LM337/D

Three-Terminal Adjustable

Output Negative Voltage

Regulator

The LM337 is an adjustable 3±terminal negative voltage regulator capable of supplying in excess of 1.5 A over an output voltage range of ±1.2 V to ±37 V. This voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage. Further, it employs internal current limiting, thermal shutdown and safe area compensation, making it essentially blow±out proof.

The LM337 serves a wide variety of applications including local, on card regulation. This device can also be used to make a programmable output regulator, or by connecting a fixed resistor between the adjustment and output, the LM337 can be used as a precision current regulator.

•Output Current in Excess of 1.5 A

•Output Adjustable between ±1.2 V and ±37 V

•Internal Thermal Overload Protection

•Internal Short Circuit Current Limiting Constant with Temperature

•Output Transistor Safe±Area Compensation

•Floating Operation for High Voltage Applications

•Eliminates Stocking many Fixed Voltages

•Available in Surface Mount D2PAK and Standard 3±Lead Transistor Package

Standard Application

			IPROG
Cin*		+	R2		CO**	+
1.0	μF			R1	1.0 μF
				120
			IAdj
			Vin		Vout
±Vin			LM337			±Vout

*Cin is required if regulator is located more than 4 inches from power supply filter. A 1.0 μF solid tantalum or 10 μF aluminum electrolytic is recommended.

**CO is necessary for stability. A 1.0 μF solid tantalum or 10 μF aluminum electrolytic is recommeded.

R

Vout + ±1.25 V 1 ) R2 1

LM337

THREE±TERMINAL ADJUSTABLE NEGATIVE VOLTAGE REGULATOR

SEMICONDUCTOR

TECHNICAL DATA

T SUFFIX

PLASTIC PACKAGE

CASE 221A

Heatsink surface connected to Pin 2.

1

2

			3
	Pin	1.	Adjust
		2.	Vin
		3.	Vout
	D2T SUFFIX
	PLASTIC PACKAGE
	CASE 936		2
	(D2PAK)	1
			3

Heatsink surface (shown as terminal 4 in case outline drawing) is connected to Pin 2.

ORDERING INFORMATION

		Operating
	Device	Temperature Range	Package
	LM337BD2T	TJ = ± 40° to +125°C	Surface Mount
	LM337BT		Insertion Mount
	LM337D2T	TJ = 0° to +125°C	Surface Mount
	LM337T		Insertion Mount

Motorola, Inc. 1996

Rev 1

		LM337
MAXIMUM RATINGS
Rating	Symbol	Value	Unit
Input±Output Voltage Differential	VI±VO	40	Vdc
Power Dissipation
Case 221A
TA = +25°C	PD	Internally Limited	W
Thermal Resistance, Junction±to±Ambient	θJA	65	°C/W
Thermal Resistance, Junction±to±Case	θJC	5.0	°C/W
Case 936 (D2PAK)
TA = +25°C	PD	Internally Limited	W
Thermal Resistance, Junction±to±Ambient	θJA	70	°C/W
Thermal Resistance, Junction±to±Case	θJC	5.0	°C/W
Operating Junction Temperature Range	TJ	± 40 to +125	°C
Storage Temperature Range	Tstg	± 65 to +150	°C

ELECTRICAL CHARACTERISTICS (|VI±VO| = 5.0 V; IO = 0.5 A for T package; TJ = Tlow to Thigh [Note 1]; Imax and Pmax [Note 2].)

Characteristics	Figure	Symbol	Min	Typ	Max	Unit
Line Regulation (Note 3), TA = +25°C, 3.0 V ≤ |VI±VO| ≤ 40 V	1	Regline	±	0.01	0.04	%/V
Load Regulation (Note 3), TA = +25°C, 10 mA ≤ IO ≤ Imax	2	Regload
|VO| ≤ 5.0 V			±	15	50	mV
|VO| ≥ 5.0 V			±	0.3	1.0	% VO
Thermal Regulation, TA = +25°C (Note 6), 10 ms Pulse		Regtherm	±	0.003	0.04	% VO/W
Adjustment Pin Current	3	IAdj	±	65	100	μA
Adjustment Pin Current Change, 2.5 V ≤ |VI±VO| ≤ 40 V,	1, 2	IAdj	±	2.0	5.0	μA
10 mA ≤ IL ≤ Imax, PD ≤ Pmax, TA = +25°C
Reference Voltage, TA = +25°C, 3.0 V ≤ |VI±VO| ≤ 40 V,	3	Vref	±1.213	±1.250	±1.287	V
10 mA ≤ IO ≤ Imax, PD ≤ Pmax, TJ = Tlow to Thigh			±1.20	±1.25	±1.30
Line Regulation (Note 3), 3.0 V ≤ |VI±VO| ≤ 40 V	1	Regline	±	0.02	0.07	%/V
Load Regulation (Note 3), 10 mA ≤ IO ≤ Imax	2	Regload
|VO| ≤ 5.0 V			±	20	70	mV
|VO| ≥ 5.0 V			±	0.3	1.5	% VO
Temperature Stability (Tlow ≤ TJ ≤ Thigh)	3	TS	±	0.6	±	% VO
Minimum Load Current to Maintain Regulation	3	ILmin				mA
(|VI±VO| ≤ 10 V)			±	1.5	6.0
(|VI±VO| ≤ 40 V)			±	2.5	10
Maximum Output Current	3	Imax				A
|VI±VO| ≤ 15 V, PD ≤ Pmax, T Package			±	1.5	2.2
|VI±VO| ≤ 40 V, PD ≤ Pmax, TJ = +25°C, T Package			±	0.15	0.4
RMS Noise, % of VO, TA = +25°C, 10 Hz ≤ f ≤ 10 kHz		N	±	0.003	±	% VO
Ripple Rejection, VO = ±10 V, f = 120 Hz (Note 4)	4	RR				dB
Without CAdj			±	60	±
CAdj = 10 μF			66	77	±
Long±Term Stability, TJ = Thigh (Note 5), TA = +25°C for	3	S	±	0.3	1.0	%/1.0 k
Endpoint Measurements						Hrs.
Thermal Resistance Junction±to±Case, T Package		RθJC	±	4.0	±	°C/W

NOTES: 1. Tlow to Thigh = 0° to +125°C, for LM337T, D2T. Tlow to Thigh = ± 40° to +125°C, for LM337BT, BD2T.

2.Imax = 1.5 A, Pmax = 20 W

3.Load and line regulation are specified at constant junction temperature. Change in VO because of heating effects is covered under the Thermal Regulation specification. Pulse testing with a low duty cycle is used.

4.CAdj, when used, is connected between the adjustment pin and ground.

5.Since Long Term Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability from lot to lot.

6.Power dissipation within an IC voltage regulator produces a temperature gradient on the die, affecting individual IC components on the die. These effects can be minimized by proper integrated circuit design and layout techniques. Thermal Regulation is the effect of these temperature gradients on the output voltage and is expressed in percentage of output change per watt of power change in a specified time.

2	MOTOROLA ANALOG IC DEVICE DATA

LM337

Representative Schematic Diagram

								Adjust
			100					60
					2.0k
			2.5k
				810	21k
								Vout
				10k		800
					15pF	25pF
				5.0k			220
75	60k	100k	800	15pF	2.0k
0
		18k
	4.0k
				6.0k			100
1.0k
	9.6k			3.0k	2.2k	18k	30k
270					5.0pF	240	2.0	250
		20k		100pF			pF
					5.0k
	8.0k							0.2
600				100k
								15
	2.9k
	4.0k		500	2.4k	15	500	155	0.05
								Vin

This device contains 39 active transistors.

	Figure 1. Line Regulation and		IAdj/Line Test Circuit
		R2 1%
				+
Cin	1.0 μF	IAdj	CO	1.0 μF
			120
* Pulse testing required.		Adjust	R1 1%	RL
1% Duty Cycle		Vin	Vout
is suggested.
		LM337
	VIH			VOH
*	VIL			VOL
	V	Line Regulation (% V) + |VOL±VOH|		x 100
	EE		|VOH|

MOTOROLA ANALOG IC DEVICE DATA	3