MIC2940A/2941A
Micrel
Absolute Maximum Ratings
Ordering Information
Part Number
MIC2940A-3.3BT
MIC2940A-3.3BU
MIC2940A-5.0BT
MIC2940A-5.0BU
MIC2940A-12BT
MIC2940A-12BU
MIC2941ABT
MIC2941ABU
Voltage
3.3
3.3
5.0
5.0
12
12
Adj
Adj
Temperature Range*
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
*
Junction temperatures
Package
TO-220
TO-263
TO-220
TO-263
TO-220
TO-263
TO-220-5
TO-263-5
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
JC
........................................................ 2
°C/W
TO-263
θ
JC
........................................................ 2
°C/W
Input Supply Voltage ............................... –20V to +60V
Operating Input Supply Voltage .................. 2V
†
to 26V
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
†
Across the full operating temperature, the minimum
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.
Schematic Diagram
IN
FEEDBACK
R18
20kΩ
Q15A
Q15B
Q24
Q26
Q25
Q9
Q3
OUT
R11
18
kΩ
Q4
Q7
Q5
Q8
SENSE
Q14
Q6
Q1
10
R1
20 kΩ
C1
20
pF
R11
20.6
kΩ
Q2
Q20
Q16
Q17
R17
12 kΩ
R27
V TAP
R28
Q42
R8
31.4 kΩ
R10
150
kΩ
Q22
Q21
C2
40 pF
Q23
R2
50 kΩ
R5
180
kΩ
Q13
R6
140
kΩ
Q12
R9
27.8 kΩ
R15
100 kΩ
Q40
Q41
R12
110
kΩ
Q11
R13
100
kΩ
R14
350
kΩ
Q29
R16
30 kΩ
R17
10
Ω
R30
30
kΩ
Q18
Q19
Q28
R3
50 kΩ
R4
13 kΩ
R21 8
Ω
50 kΩ
Q37
Q36
Q30 Q31
SHDN
R22
150 kΩ
R24
50 kΩ
R23 60 kΩ
10 kΩ
ERROR
Q38
R26
60 kΩ
Q34
R25
2.8 kΩ
DENOTES CONNECTION ON FIXED
VOLTAGE VERSIONS ONLY
Q39
GND
MIC2940A/2941A
2
June 1999
MICREL [ MICREL SEMICONDUCTOR ]
