Datasheet
Micrel, Inc. MIC2940A/2941A
July 2007
3
M9999-071307
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 sec.)........................ 260°C
Storage Temperature ................................–65°C to +150°C
Operating Junction Temperature ..............–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.
Electrical Characteristics
Limits in standard typeface are for T
J
= 25°C and limits in boldface apply over the full operating temperature range.
Unless otherwise specified, V
IN
= V
OUT
+ 1V, I
L
= 1000mA, C
L
= 10µF. The MIC2941A is programmed to output 5V and
has V
SHUTDOWN
0.6V.
Symbol Parameter Condition Min Typ Max Units
V
O
Output Voltage Accuracy
5 mA ≤ I
L
≤ 1A
–1
–2
–2.5
1
2
2.5
%
%
%
∆V
O
∆T
Output Voltage Temperature
Coefficient
(Note 2)
20 100 ppm/°C
Line Regulation I
O
= 10mA, (V
OUT
+ 1V) ≤ V
IN
≤ 26V 0.06 0.50 %
∆V
O
V
O
Load Regulation
I
L
= 5mA to 1.25A
I
L
= 5mA to 1A (Note 3)
0.04
0.16
0.20
%
%
V
IN
– V
O
Dropout Voltage (Note 4) I
L
= 5mA
I
L
= 250mA
I
L
= 1000mA
I
L
= 1250mA
60
200
350
400
150
180
250
320
450
600
600
mV
mV
mV
mV
mV
mV
mV
I
GND
Ground Pin Current (Note 5) I
L
= 5mA
I
L
= 250mA
I
L
= 1000mA
I
L
= 1250mA
240
3
22
35
500
4.5
6
35
45
70
µA
mA
mA
mA
mA
mA
I
GNDDO
Ground Pin Current at Dropout
(Note 5)
V
IN
= 0.5V less than designed V
OUT
(V
OUT
3.3)
I
L
= 5mA
330 600 µA
I
LIMIT
Current Limit
V
OUT
= 0V (Note 6)
1.6 3.5 A
∆V
O
∆P
D
Thermal Regulation
(Note 7)
0.05 0.2 %/W
e
n
Output Noise Voltage
(10Hz to 100kHz)
I
L
= 100mA
C
L
= 10µF
C
L
= 33µF
400
260
µV
RMS
µV
RMS