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MIC29371-5.0WT

P1-P3P4-P6P7-P9P10-P12
MIC2937A/29371/29372 Micrel, Inc.
May 2006 1 MIC2937A/29371/29372
Features
• High output voltage accuracy
• Guaranteed 750mA 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 posi-
tive transients
• Error flag warns of output dropout
• Logic-controlled electronic shutdown
• Output programmable from 1.24V to 26V(MIC29372)
• 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 V
CC
and V
PP
Regulation/Switching
• Bar Code Scanners
• Automotive Electronics
• SMPS Post-Regulator/ DC to DC Modules
• High Efficiency Linear Power Supplies
Pin Configuration
GROUND OUTPUTINPUT
TO-220-5 Package
(MIC29371/29372BT/WT)
TO-220 Package
(MIC2937A-xxBT/WT)
General Description
The MIC2937A family are “bulletproof” efficient voltage regu-
lators with very low dropout voltage (typically 40mV at light
loads and 300mV at 500mA), and very low quiescent current
(160µA typical). The quiescent current of the MIC2937A in-
creases only slightly in dropout, thus prolonging battery life.
Key MIC2937A features include protection against reversed
battery, fold-back current limiting, and automotive “load dump”
protection (60V positive transient).
The MIC2937 is available in several configurations. The
MIC2937A-xx devices are three pin fixed voltage regulators
with 3.3V, 5V, and 12V outputs available. The MIC29371 is
a fixed regulator offering logic compatible ON/OFF switching
input and an error flag output. This flag may also be used as
a power-on reset signal. A logic-compatible shutdown input
is provided on the adjustable MIC29372, which enables the
regulator to be switched on and off.
TO-263 Package
(MIC2937A-xxBU/WU)
GROUND
OUTPUTINPUT
TO-263-5 Package
(MIC29371/29372BU/WU)
Five Lead Package Pin Functions:
MIC29371 MIC29372
1) Error Adjust
2) Input Shutdown
3) Ground Ground
4) Output Input
5) Shutdown Output
The TAB is Ground on the TO-220 and TO-263 packages.
MIC2937A/29371/29372
750mA 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
21 3
1 2 3 4 5
21 3
1 2 3 4 5
MIC2937A/29371/29372 Micrel, Inc.
MIC2937A/29371/29372 2 May 2006
Ordering Information
Part Number
Voltage Junction Temp. Range
Package
Standard RoHS Compliant*
MIC2937A-3.3BU MIC2937A-3.3WU 3.3V –40ºC to +125ºC TO-263-3
MIC2937A-3.3BT MIC2937A-3.3WT 3.3V –40ºC to +125ºC TO-220-3
MIC2937A-5.0BU MIC2937A-5.0WU 5.0V –40ºC to +125ºC TO-263-3
MIC2937A-5.0BT MIC2937A-5.0WT 5.0V –40ºC to +125ºC TO-220-3
MIC2937A-12BU MIC2937A-12WU 12V –40ºC to +125ºC TO-263-3
MIC2937A-12BT MIC2937A-12WT 12V –40ºC to +125ºC TO-220-3
MIC29371-3.3BU MIC29371-3.3WU 3.3V –40ºC to +125ºC TO-263-5
MIC29371-3.3BT MIC29371-3.3WT 3.3V –40ºC to +125ºC TO-220-5
MIC29371-5.0BU MIC29371-5.0WU 5.0V –40ºC to +125ºC TO-263-5
MIC29371-5.0BT MIC29371-5.0WT 5.0V –40ºC to +125ºC TO-220-5
MIC29371-12BU MIC29371-12WU 12V –40ºC to +125ºC TO-263-5
MIC29371-12BT MIC29371-12WT 12V –40ºC to +125ºC TO-220-5
MIC29372BU MIC29372WU ADJ –40ºC to +125ºC TO-263-5
MIC29372BT MIC29372WT ADJ –40ºC to +125ºC TO-220-5
* RoHS compliant with ‘high-melting solder’ exemption.
MIC2937A/29371/29372 Micrel, Inc.
May 2006 3 MIC2937A/29371/29372
Electrical Characteristics
Limits in standard typeface are for T
J
= 25°C and limits in boldface apply over the full operating temperature range. Unless other-
wise specified, V
IN
= V
OUT
+ 1V, I
L
= 5mA, C
L
= 10µF. The MIC29372 are programmed for a 5V output voltage, and V
SHUTDOWN
≤ 0.6V
(MIC29371-xx and MIC29372 only).
Symbol Parameter Conditions Min Typical Max Units
V
O
Output Voltage Variation from factory trimmed V
OUT
–1 1 %
Accuracy –2 2
5mA ≤ I
L
≤ 500mA –2.5 2.5
MIC2937A-12 and 29371-12 only: –1.5 1.5
–3 3
5mA ≤ I
L
≤ 500mA –4 4
ΔV
O
Output Voltage (Note 2) 20 100 ppm/°C
ΔT Temperature Coef. Output voltage > 10V 80
350
ΔV
O
Line Regulation V
IN
= V
OUT
+ 1V to 26V 0.03 0.10 %
V
O
0.40
ΔV
O
Load Regulation I
L
= 5 to 500mA 0.04 0.16 %
V
O
(Note 3) 0.30
V
IN
– V
O
Dropout Voltage I
L
= 5mA 80 150 mV
(Note 4) 180
I
L
= 100mA 200
Output voltage > 10V 240
I
L
= 500mA 300
Output voltage > 10V 420
I
L
= 750mA 370 600
750
I
GND
Ground Pin Current I
L
= 5mA 160 250 µA
(
Note 5) 300
I
L
= 100mA 1 2.5 mA
3
I
L
= 500mA 8 13
16
I
L
= 750mA 15 25
I
GNDDO
Ground Pin V
IN
= 0.5V less than designed V
OUT
200 500 µA
Current at Dropout (V
OUT
≥ 3.3V)
(
Note 5) I
O
= 5mA
I
LIMIT
Current Limit V
OUT
= 0V 1.1 1.5 A
(
Note 6) 2
ΔV
O
Thermal Regulation (Note 7) 0.05 0.2 %/W
ΔP
D
e
n
Output Noise C
L
= 10µF 400 µV RMS
Voltage
(10Hz to 100kHz) C
L
= 100µF 260
I
L
= 100mA
Absolute Maximum Ratings
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
.....................................................................................2.5°C/W
TO-263
θ
JC
.....................................................................................2.5°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.
P1-P3P4-P6P7-P9P10-P12

MIC29371-5.0WT

Mfr. #:
Buy MIC29371-5.0WT
Manufacturer:
Microchip Technology / Micrel
Description:
LDO Voltage Regulators 750mA LDO Fixed Voltage + Flag + Shutdown
Lifecycle:
New from this manufacturer.
Delivery:
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