LM138 datasheet(6/23 Pages) STMICROELECTRONICS

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Electrical characteristics

LM138 - LM238 - LM338

6/23

Electrical characteristics

Table 4.

Electrical characteristics for LM138/LM238 (1)

(TJ = -55 to 150 °C for LM138, TJ = -25 to 150 °C for LM238, VI - VO = 5 V, IO = 2.5 A. Although power dissipation is

internally limited, these specifications apply to power dissipation up to 50 W, unless otherwise specified)

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

KVI

Line regulation (2)

Regulation is measured at constant junction temperature. Changes in output voltage due to heating effects are taken into

account separately by thermal rejection.

TA = 25°C, VI - VO = 3 to 35 V

0.005

0.01

%/V

KVO

Load regulation (2)

TA = 25°C

IO = 10 mA to 5 A

VO ≤ 5 V

VO ≥ 5 V

0.1

0.3

Thermal regulation

Pulse = 20 ms

0.002

0.01

%/W

IADJ

Adjustment pin current

100

µA

ΔIADJ

Adjustment pin current

change

IL = 10 mA to 5 A, VI - VO = 3 to 35 V

0.2

µA

VREF

Reference voltage

VI - VO = 3 to 35 V, IO = 10 mA to 5 A

≤ 50 W

1.19

1.24

1.29

KVI

Line regulation (2)

VI - VO = 3 to 35 V

0.02

0.04

%/V

KVO

Load regulation (2)

IO = 10 mA to 5 A

VO ≤ 5 V

VO ≥ 5 V

0.3

0.6

KVT

Temperature stability

TJ = TMIN to TMAX

IO(MIN) Minimum load current

VI - VO ≤ 35 V

3.5

IO(MAX) Current limit

VI - VO ≤ 10 V

0.5 ms Peak

VI - VO = 30 V

VNO

RMS output noise (% of

VO)

Ta = 25°C, f = 10 Hz to 10 kHz

0.003

RVF

Ripple rejection ratio

VO = 10 V, f = 120 Hz

CADJ = 10 µF

KVH

Long term stability

TA = 125°C

0.3

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