MIC2940A/2941A

Micrel

MIC2940A/2941A

2

June 1999

Absolute Maximum Ratings

If Military/Aerospace specified devices

are required, contact your local Micrel

representative/distributor for availability

and specifications.

Power Dissipation (Note 1) ............... Internally Limited

Lead Temperature (Soldering, 5 seconds) ........ 260

°C

Storage Temperature Range ............ –65

°C to +150°C

Operating Junction Temperature Range

................................................. –40

°C to +125°C

TO-220

θ

TO-263

θ

Input Supply Voltage ............................... –20V to +60V

Adjust Input Voltage (Notes 9 and 10)

...................................................... –1.5V to +26V

Shutdown Input Voltage ......................... –0.3V to +30V

Error Comparator Output Voltage .......... –0.3V to +30V

input voltage range for full output current is 4.3V to 26V.

Output will remain in-regulation at lower output voltages

and low current loads down to an input of 2V at 25

°C.

FEEDBACK

SENSE

Q15A

OUT

Q24

Q26

R27

V TAP

R28

R18

20k

Ω

Q25

Q23

Q22

R15

100 k

Ω

R16

30 k

Ω

Q29

Q28

R17

10

Ω

R21 8

Ω

R17

12 k

Ω

Q31

Q30

R23 60 k

Ω

SHDN

R24

50 k

Ω

R22

150 k

Ω

Q21

Q19

C2

40 pF

R14

350

k

Ω

Q14

R13

100

k

Ω

Q18

R12

110

k

Ω

Q20

Q9

Q15B

Q8

Q7

R11

20.6

k

Ω

Q5

R8

31.4 k

Ω

R10

150

k

Ω

R9

27.8 k

Ω

Q11

Q12

Q13

R6

140

k

Ω

R5

180

k

Ω

R4

13 k

Ω

R3

50 k

Ω

Q2

C1

20

pF

Q4

Q3

R11

18

k

Ω

Q6

Q1

10

R1

20 k

Ω

R2

50 k

Ω

Q41

R30

30

k

Ω

Q40

Q34

GND

Q36

Q37

R25

2.8 k

Ω

Q38

ERROR

R26

60 k

Ω

Q39

DENOTES CONNECTION ON FIXED

VOLTAGE VERSIONS ONLY

Q42

Q16

Q17

50 k

Ω

10 k

Ω

IN

Schematic Diagram

Ordering Information

Part Number

Voltage

Temperature Range*

Package

MIC2940A-3.3BT

3.3

–40

°C to +125°C

TO-220

MIC2940A-3.3BU

3.3

–40

°C to +125°C

TO-263

MIC2940A-5.0BT

5.0

–40

°C to +125°C

TO-220

MIC2940A-5.0BU

5.0

–40

°C to +125°C

TO-263

MIC2940A-12BT

12

–40

°C to +125°C

TO-220

MIC2940A-12BU

12

–40

°C to +125°C

TO-263

MIC2941ABT

Adj

–40

°C to +125°C

TO-220-5

MIC2941ABU

Adj

–40

°C to +125°C

TO-263-5