MIC2940 Micrel Semiconductor, MIC2940 Datasheet - Page 2

• Manufacturer Part Number: MIC2940
• Description: 1.25A Low-Dropout Voltage Regulator Preliminary Information
• Manufacturer: Micrel Semiconductor

MIC2940A/2941A
Schematic Diagram
MIC2940A/2941A
Ordering Information
Part Number
MIC2940A-3.3BT
MIC2940A-3.3BU
MIC2940A-5.0BT
MIC2940A-5.0BU
MIC2940A-12BT
MIC2940A-12BU
MIC2941ABT
MIC2941ABU
50 k
10 k
Q42
Q40
R30
k
30
Q6
50 k
20 k
Q41
R2
R1
10
Q1
Q3
Voltage
50 k
3.3
3.3
5.0
5.0
Adj
Adj
12
12
R3
R11
18
k
ERROR
180
R5
k
IN
C1
20
pF
Q13
13 k
R4
140
R6
k
Temperature Range*
*
Q4
Q38
Q12
–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
Q39
Q2
Q5
31.4 k
27.8 k
Q37
20.6
R11
R8
R9
Q15A
k
R26
60 k
Q7
Q11
Q36
R10
150
k
Q8
R25
2.8 k
Q9
Q34
R12
110
2
Q20
k
TO-220-5
TO-263-5
Package
TO-220
TO-263
TO-220
TO-263
TO-220
TO-263
Q18
R13
Q16
100
GND
k
R22
150 k
Q15B
Q17
R14
350
k
C2
40 pF
Q30
Q19
Q14
DENOTES CONNECTION ON FIXED
VOLTAGE VERSIONS ONLY
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
TO-220
TO-263
Input Supply Voltage ............................... –20V to +60V
Operating Input Supply Voltage .................. 2V
Adjust Input Voltage (Notes 9 and 10)
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.
Across the full operating temperature, the minimum
Q31
Q21
12 k
Q29
FEEDBACK
................................................. –40 C to +125 C
...................................................... –1.5V to +26V
R17
JC
JC
R24
50 k
Q28
........................................................ 2 C/W
........................................................ 2 C/W
Q22
R15
100 k
R16
30 k
Q25
R23 60 k
R21 8
R18
20k
Q26
10
R17
Q23
SHDN
R27
R28
Q24
SENSE
V TAP
OUT
June 1999
†
Micrel
to 26V