NEGATIVE ADJUSTABLE

VOLTAGE REGULATOR

Semelab Limited

Semelab Limited

Semelab Limited

Semelab Limited

Coventry Road, Lutterworth, Leicestershire, LE17 4JB

Telephone +44 (0) 1455 556565

Fax +44 (0) 1455 552612

Document Number 8211

Issue 2

Page 3 of 5

LM137A, IP137A, LM137AHV, IP137AHV

Symbols

Parameters

Test Conditions

Min.

Typ

Max.

Units

IOUT = 10mA

-1.238

-1.250

-1.262

VREF

Reference Voltage

10mA ≤ IOUT ≤ IMAX, P ≤ PMAX,

3V ≤ (VIN-VOUT) ≤ VMAX

V

0.005

0.010

IN

OUT

V

V

∆

∆

Line Regulation (2)

3V ≤ (VIN-VOUT) ≤ VMAX,

IOUT = 10mA

●

0.010

0.030

%/V

VOUT ≤ 5V

5

25

mV

VOUT ≥ 5V

0.1

0.5

%

10

50

mV

OUT

I

OUT

V

∆

∆

Load Regulation (2)(3)

10mA ≤ IOUT ≤ IMAX

0.2

1.0

%

Thermal Regulation

VIN = -7.92V, IOUT = 1.5A,

PD = 10W, TA = 25°C, 10ms Pulse

0.002

0.02

%/W

VOUT = -10V

CADJ = 0

60

66

Ripple Rejection

f = 120Hz

70

80

dB

IADJ

Adjust Pin Current

●

65

100

10mA ≤ IOUT ≤ IMAX

●

0.2

2

3V ≤ (VIN-VOUT) ≤ 40V

●

1.0

5

∆IADJ

Adjust Pin Current Change

3V ≤ (VIN-VOUT) ≤ 50V (HV Series)

(HV Series)

(HV Series)

(HV Series)

●

2

6

µA

(VIN - VOUT) ≤ 40V

●

2.5

5

IMIN

Minimum Load Current

(VIN - VOUT) ≤ 10V

●

1.2

3

mA

(VIN - VOUT) ≤ 15V

●

1.5

2.2

3.2

(VIN - VOUT) = 40V

●

0.24

0.4

1.0

ICL

Current Limit

(VIN - VOUT) = 50V (HV Series)

(HV Series)

(HV Series)

(HV Series)

●

0.2

0.4

0.8

A

TEMP

OUT

V

∆

∆

Temperature Stability

●

0.6

1.5

TIME

OUT

V

∆

∆

Long Term Stability

TA = 125°C, 1000Hrs

0.3

1.0

en

RMS Output Noise

(% of VOUT)

TA = 25°C, 10Hz ≤ f ≤ 10KHz

0.003

%

Notes

Notes

Notes

Notes

The ● denotes the specifications which apply over the full operating temperature range.

(1)

Test conditions unless otherwise stated: VIN - VOUT = 5V, IOUT = 0.5A, PMAX = 10W, IMAX = 1.5A

(2)

Regulation is measured at constant junction temperature, using pulse testing at a low duty cycle. Changes in output voltage due to heating

effects are covered under thermal regulation specifications. Load regulation is measured at the junction of the wide and narrow portion of

the output lead.

(3)

VMAX = 40V for LM137, IP137, LM137A, IP137A

VMAX = 50V for LM137HV, IP137HV, LM137AHV, IP137AHV