LM138K datasheet(3/12 Pages) STMICROELECTRONICS

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ELECTRICAL CHARACTERISTICS

LM138: -55

≤ Tj ≤ 150 oC, VI -VO = 5V, IO =2.5A

LM238: -25

≤ Tj ≤ 150 oC, VI -VO = 5V, IO =2.5A

LM338: 0

≤ Tj ≤ 150 oC, VI -VO = 5V, IO = 2.5A

Although power dissipation is internally limited, these specifications apply to power dissipation up to

50W (unless otherwise specified).

Symbol

Parameter

LM138-LM238

LM338

Unit

Min.

Typ.

Max.

Min.

Typ.

Max.

KVI

Line Regulation - (note 1)

Tamb =25

oC, 3 V

≤ (VI -VO) ≤ 35 V

0.005

0.01

0.005

0.03

%/V

KVO

Load Regulation Tamb =25

oC, 10 mA ≤ IO ≤ 5A

≤ 5V - (note 1)

≥ 5V - (note 1)

0.1

0.3

0.1

0.5

Thermal Regulation (pulse = 20 ms)

0.002

0.01

0.002

0.02

%/W

Iadj

Adjustment Pin Current

100

µA

∆Iadj

Adjustment Pin Current Change

10 mA

≤ IL ≤ 5A, 3 V ≤ (VI -VO) ≤ 35 V

0.2

µA

v(ref)

Reference Voltage

≤ (VI -VO) ≤ 35 V, 10 mA ≤ IO ≤ 5A, P ≤ 50W

1.19

1.24

1.29

1.19

1.24

1.29

KVI

Line Regulation - (note 1)

≤ (VI -VO) ≤ 35 V

0.02

0.04

0.02

0.06

%/V

KVO

Load Regulation 10 mA

≤ IO ≤ 5A

≤ 5V - (note 1)

≥ 5V - (note 1)

0.3

0.6

0.3

KVT

Temperature Stability (Tmin

≤ Tj ≤ Tmax)1

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

RMS Output Noise, % of VO

(Tamb =25

oC, 10 Hz ≤ f ≤ 10 KHz)

0.003

Rvf

Ripple Rejection Ratio

VO = 10 V, f = 120 Hz

Cadi =10

µF60

KVH

Long Term Stability (Tamb = 125

oC)

0.3

Note 1 : Regulation is measured at constant junction temperature. Changes in output voltage due to heating effects are taken

into account separately by thermal rejection.

LM138-LM238-LM338

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