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MIC2941AWU

P1-P3P4-P6P7-P9P10-P11
MIC2940A/2941A
1.2A Low-Dropout Voltage Regulator
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
July 2007
M9999-071307
General Description
The MIC2940A and MIC2941A are “bulletproof” efficient
voltage regulators with very low dropout voltage (typically
40mV at light loads and 350mV at 1A), and low quiescent
current (240µA typical). The quiescent current of the
MIC2940A increases only slightly in dropout, thus
prolonging battery life. Key MIC2940A features include
protection against reversed battery, fold-back current
limiting, and automotive “load dump” protection (60V
positive transient).
The MIC2940 is available in both fixed voltage (3.3V, 5V,
and 12V) and adjustable voltage configurations. The
MIC2940A-xx devices are three pin, fixed voltage
regulators. A logic-compatible shutdown input is provided
on the adjustable MIC2941A, which enables the regulator
to be switched on and off.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• High output voltage accuracy
• Guaranteed 1.25A output
• Low quiescent current
• Low dropout voltage
• Extremely tight load and line regulation
• Very low temperature coefficient
• Current and thermal limiting
• Input can withstand –20V reverse battery and +60V
positive transients
• Logic-controlled electronic shutdown
• Output programmable from 1.24V to 26V(MIC2941A)
• Available in TO-220, TO-263, TO-220-5, and TO-263-5
packages.
Applications
• Battery powered equipment
• Cellular telephones
• Laptop, notebook, and palmtop computers
• PCMCIA VCC and VPP regulation/switching
• Bar code scanners
• Automotive electronics
• SMPS post-regulator/ DC-to-DC modules
• Voltage reference
• High efficiency linear power supplies
___________________________________________________________________________________________________________
Pin Configuration
123
12345
12 3
TO-263-3
(MIC2940A-xxBU/WU)
MIC2940A Pinout
1) Input
2) Ground
3) Output
12345
TO-263-5
(MIC2941ABU/WU)
MIC2941A Pinout
1) Adjust
2) Shutdown
3) Ground
4) Input
5) Output
TO-220-3
(MIC2940A-xxBT/WT)
The TAB is Ground on TO-220 and TO-263 packages
TO-220-5
(MIC2941ABT/WT)
Micrel, Inc. MIC2940A/2941A
July 2007
2
M9999-071307
Ordering Information
Part Number Voltage Temperature Range Package Lead Finish
MIC2940A-3.3BT 3.3V –40° to +125°C 3-Pin TO-220 Standard
MIC2940A-3.3BU 3.3V –40° to +125°C 3-Pin TO-263 Standard
MIC2940A-3.3WT 3.3V –40° to +125°C 3-Pin TO-220 RoHS Comliant
(1)
MIC2940A-3.3WU 3.3V –40° to +125°C 3-Pin TO-263 RoHS Comliant
(1)
MIC2940A-5.0BT 5V –40° to +125°C 3-Pin TO-220 Standard
MIC2940A-5.0BU 5V –40° to +125°C 3-Pin TO-263 Standard
MIC2940A-5.0WT 5V –40° to +125°C 3-Pin TO-220 RoHS Comliant
(1)
MIC2940A-5.0WU 5V –40° to +125°C 3-Pin TO-263 RoHS Comliant
(1)
MIC2940A-12BT 12V –40° to +125°C 3-Pin TO-220 Standard
MIC2940A-12BU 12V –40° to +125°C 3-Pin TO-263 Standard
MIC2940A-12WT 12V –40° to +125°C 3-Pin TO-220 RoHS Comliant
(1)
MIC2940A-12WU 12V –40° to +125°C 3-Pin TO-263 RoHS Comliant
(1)
MIC2941ABT Adj. –40° to +125°C 5-Pin TO-220 Standard
MIC2941ABU Adj. –40° to +125°C 5-Pin TO-263 Standard
MIC2941AWT Adj. –40° to +125°C 5-Pin TO-220 RoHS Comliant
(1)
MIC2941AWU Adj. –40° to +125°C 5-Pin TO-263 RoHS Comliant
(1)
Note:
1. RoHS compliant with ‘hot-melting solder’ exemption.
Schematic Diagram
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
P1-P3P4-P6P7-P9P10-P11

MIC2941AWU

Mfr. #:
Buy MIC2941AWU
Manufacturer:
Microchip Technology / Micrel
Description:
LDO Voltage Regulators 1.25A LDO Adj+Shutdown
Lifecycle:
New from this manufacturer.
Delivery:
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