MICREL MIC2920A-4.8BS, MIC2920A-4.8BT, MIC2920A-5.0BS, MIC2920A-3.3BT, MIC2920A-12BT Datasheet
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MIC2920A/29201/29202/29204 Micrel
January 1998 3-9
3
12 3
MIC2920A/29201/29202/29204
400mA Low-Dropout Voltage Regulator
Features
• High output voltage accuracy
• Guaranteed 400mA output
• Low quiescent current
• Low dropout voltage
• Extremely tight load and line regulation
• Very low temperature coefficient
• Current and thermal limiting
• Input withstands –20V reverse battery and
60V positive transients
• Error flag warns of output dropout
• Logic-controlled electronic shutdown
• Output programmable from 1.24V to 26V
(MIC29202/MIC29204)
• Available in TO-220, TO-220-5, and surface-mount
TO-263-5, SOT-223, and SO-8 packages.
Applications
• Battery-powered equipment
• Cellular telephones
• Laptop, notebook, and palmtop computers
• PCMCIA VCC and V
PP
regulation/switching
• Bar code scanners
• Automotive electronics
• SMPS post-regulators
• Voltage reference
• High-efficiency linear power supplies
General Description
The MIC2920A family are “bulletproof,” efficient voltage
regulators with very low dropout voltage (typically 40mV at
light loads and 370mV at 250mA), and very low quiescent
current (140µA typical). The quiescent current of the MIC2920A
increases only slightly in dropout, prolonging battery life. Key
MIC2920A features include protection against reversed battery,
fold-back current limiting, and automotive “load dump”
protection (60V positive transient).
The MIC2920 is available in several configurations. The
MIC2920A-x.x devices are three pin fixed voltage regulators
available in 3.3V, 4.85V, 5V, and 12V outputs. The MIC29201
is a fixed regulator offering a logic compatible ON/OFF
(shutdown) 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 MIC29202
which allows the regulator to be switched on and off. The
MIC29204 8-pin SOIC adjustable regulator includes both
shutdown and error flag pins and may be pin-strapped for 5V
output or programmed from 1.24V to 26V using two external
resistors.
MIC2920A-xxBT
(TO-220)
MIC29201/29202BT
(TO-220-5)
12345
MIC29201/29202BU
(TO-263-5)
5-Lead Package Pinouts
MIC29201 MIC29202
1) Error Adjust
2) Input Shutdown
3) Ground Ground
4) Output Input
5) Shutdown Output
Tab is Ground on SOT-223, TO-220, and TO-263 packages.
132
TAB
INPUT OUTPUT
GROUND
MIC2920A-x.xBS
(SOT-223)
Pin Configuration
12345
INPUT OUTPUT
GROUND
1
2
3
4
8
7
6
5
INPUT
NC
NC
ERROR
OUTPUT
SENSE
SHUTDOWN
GROUND
MIC29201-3.3BM (SO-8)
1
2
3
4
8
7
6
5
INPUT
ADJUST
5V TAP
ERROR
OUTPUT
SENSE
SHUTDOWN
GROUND
MIC29204BM (SO-8)
MIC2920A/29201/29202/29204 Micrel
3-10 January 1998
Ordering Information
Part Number Voltage Temperature Range* Package
MIC2920A-3.3BS 3.3V –40°C to +125°C SOT-223
MIC2920A-3.3BT 3.3V –40°C to +125°C TO-220
MIC2920A-4.8BS 4.85V –40°C to +125°C SOT-223
MIC2920A-4.8BT 4.85V –40°C to +125°C TO-220
MIC2920A-5.0BS 5.0V –40°C to +125°C SOT-223
MIC2920A-5.0BT 5.0V –40°C to +125°C TO-220
MIC2920A-12BS 12V –40°C to +125°C SOT-223
MIC2920A-12BT 12V –40°C to +125°C TO-220
MIC29201-3.3BM 3.3V –40°C to +125°C SO-8
MIC29201-3.3BT 3.3V –40°C to +125°C TO-220-5
MIC29201-3.3BU 3.3V –40°C to +125°C TO-263-5
MIC29201-4.8BT 4.85V –40°C to +125°C TO-220-5
MIC29201-4.8BU 4.85V –40°C to +125°C TO-263-5
MIC29201-5.0BT 5.0V –40°C to +125°C TO-220-5
MIC29201-5.0BU 5.0V –40°C to +125°C TO-263-5
MIC29201-12BT 12V –40°C to +125°C TO-220-5
MIC29201-12BU 12V –40°C to +125°C TO-263-5
MIC29202BT Adj –40°C to +125°C TO-220-5
MIC29202BU Adj –40°C to +125°C TO-263-5
MIC29204BM 5V and Adj –40°C to +125°C SO-8
MIC29204BN 5V and Adj –40°C to +125°C 8-pin PDIP
Absolute Maximum Ratings
If Military/Aerospace specified devices
are required, contact your local Micrel
representative/distributor for availability
and specifications.
Power Dissipation ................ Internally Limited, Note 1
Lead Temperature (Soldering, 5 seconds) ........ 260°C
Storage Temperature Range ............ –65°C to +150°C
Operating Junction Temperature Range
................................................. –40°C to +125°C
Thermal Characteristics:
SOT−223 θJC.................................................... 15°C/W
TO-220 θJC......................................................... 3°C/W
TO-263 θJC......................................................... 3°C/W
8-Pin SOIC θJA...................................................Note 1
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.
* Junction temperatures
MIC2920A/29201/29202/29204 Micrel
January 1998 3-11
3
Limits in standard typeface are for TJ = 25°C and limits in boldface apply over the full operating temperature range. Unless
otherwise specified, VIN = V
OUT
+ 1V, IL = 1mA, CL = 10µF. Adjustable version are set for an output of 5V. The MIC29202 V
SHUTDOWN
≤ 0.7V. The eight pin MIC29204 is configured with the Adjust pin tied to the 5V Tap, the Output is tied to Output Sense (V
OUT
= 5V), and V
SHUTDOWN
≤ 0.7V.
Symbol Parameter Conditions Min Typical Max Units
V
O
Output Voltage Variation from factory trimmed V
OUT
–1 1 %
Accuracy –2 2
1mA ≤ IL ≤ 400mA, across temp. range –2.5 2.5
MIC2920A-12 and 29201-12 only –1.5 1.5
–3 3
1mA ≤ IL ≤ 400mA, across temp. range –4 4
∆V
O
Output Voltage (Note 2) 20 100 ppm/°C
∆T Temperature Coef. V
OUT
> 10V only 80 350
∆V
O
Line Regulation VIN = V
OUT
+ 1V to 26V 0.03 0.10 %
V
O
0.40
∆V
O
Load Regulation IL = 1 to 250mA (Note 3) 0.04 0.16 %
V
O
0.30
VIN – V
O
Dropout Voltage IL = 1mA 100 150 mV
(Note 4) 180
IL = 100mA 250
V
OUT
> 10V only 350
IL = 250mA 370
V
OUT
> 10V only 500
IL = 400mA 450 600
750
I
GND
Ground Pin Current IL = 1mA 140 200 µA
(Note 5) 300
IL = 100mA 1.3 2 mA
2.5
IL = 250mA 5 9
12
IL = 400mA 13 15
I
GNDDO
Ground Pin VIN = 0.5V less than designed V
OUT
180 400 µA
Current at Dropout (V
OUT
≥ 3.3V)
(Note 5) IO = 1mA
I
LIMIT
Current Limit V
OUT
= 0V 425 1000 mA
(Note 6) 1200
∆V
O
Thermal Regulation (Note 7) 0.05 0.2 %/W
∆P
D
e
n
Output Noise CL = 10µF 400 µV RMS
Voltage
(10Hz to 100kHz) CL = 100µF 260
IL = 100mA
Electrical Characteristics
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