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MIC29312WU-TR

P1-P3P4-P6P7-P9P10-P12
November 2006 1 MIC29310/29312
MIC29310/29312 Micrel
General Description
The MIC29310 and MIC29312 are low cost versions of
MIC29300 family low-dropout (LDO) regulators. Manufac-
tured on Micrel’s proprietary Super beta PNP™ process,
the MIC29310/2 is a 3A LDO regulator with very low-dropout
voltage (600mV over the full load) and low ground current.
Along with a total accuracy of ±2% (over temperature, line
and load regulation) these regulators feature very fast tran-
sient recovery from input voltage surges and output load
current changes.
The MIC29310 is available in fi xed 3.3V and 5V outputs
voltages; the MIC29312 has an adjustable output which can
be set by two external resistors to a voltage between 1.24V
to 15V. In addition, all versions are fully protected against
overcurrent faults, reversed input polarity, reversed lead
insertion, and overtemperature operation.
A TTL logic enable (EN) pin is available in the MIC29312 to
shutdown the regulator. When not used, the device can be set
to continuous operation by connecting EN to the input (IN).
The MIC29310/2 is available in the standard 3- and 5-pin
TO-220 and TO-263 packages with an operating junction
temperature range of 0°C to +125°C.
Features
• Low cost versions of MIC29300 family
• Fast transient response
• 3A current over full temperature range
• 600mV dropout voltage at full load
• Low ground current
• Accurate 1% guaranteed tolerance
• “Zero” current shutdown mode (MIC29312)
• Fixed voltage and adjustable versions
Applications
• Processor peripheral and I/O supplies
• PC add-in cards
• High-effi ciency “green” computer systems
• High-effi ciency linear power supplies
• High-effi ciency switching supply post regulator
• Battery-powered equipment
MIC29310/29312
3A Fast-Response LDO Regulator
Typical Application
IN OUT
GND
V
IN
V
OUT
MIC29310-x.x
Fixed Regulator Confi guration
MIC29312
OUT
ADJ
R1*
V
OUT
* For best performance, total series resistance
(R1 + R2) should be small enough to pass
the minimum regulator load current of 10mA.
R2*
EN
GND
V
IN
IN
On
Off
V
OUT
= 1.240
R1
R2
+ 1
Adjustable Regulator Confi guration
For applications requiring even lower dropout
voltage, input voltage greater than 16V, or an
error fl ag, see the MIC29300/29301/29302/
29303.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
MIC29310/29312 Micrel
MIC29310/29312 2 November 2006
Pin Description
Pin Number Pin Number Pin Name Pin Function
MIC29310 MIC29312
1 EN Enable (Input): Active-high, logic-level enable/shutdown control.
1 2 IN Unregulated Input: +16V maximum supply.
2,
TAB 3, TAB GND Ground: Ground pin and TAB are internally connected.
3 4 OUT Regulator Output
5 ADJ Ouput Voltage Adjust: 1.24V feedback from external resistive divider.
Pin Confi guration
TAB
3OUT
2GND
1IN
MIC29310-x.xBT/WT
TO-220-3 (T)
TAB
5ADJ
4OUT
3GND
2IN
1EN
MIC29312-x.xBT/WT
TO-220-5 (T)
TAB
3OUT
2GND
1IN
MIC29310-x.xBU/WU
TO-263-3 (U)
TAB
5ADJ
4OUT
3GND
2IN
1EN
MIC29312-x.xBU/WU
TO-263-5 (U)
Absolute Maximum Ratings (Note 1)
Input Voltage (V
IN
) ..........................................–20V to +20V
Power Dissipation (P
D
) ............................. Internally Limited
Storage Temperature Range (T
S
) ............. –65°C to +150°C
Lead Temperature (soldering, 5 sec.) ........................ 260°C
ESD, Note 3
Operating Ratings (Note 2)
Input Voltage (V
IN
) ........................................ +2.3V to +16V
Junction Temperature (T
J
) ............................ 0°C to +125°C
Package Thermal Resistance
TO-263 (θ
JC
) ......................................................... 2°C/W
TO-220 (θ
JC
) ......................................................... 2°C/W
TO-220 (θ
JA
) ....................................................... 55°C/W
Ordering Information
Part Number
Voltage
Junction Temperature
Range
Package
Standard RoHS Compliant
(1)
MIC29310-3.3BT MIC29310-3.3WT 3.3V 0°C to +125°C TO-220
MIC29310-3.3BU MIC29310-3.3WU 3.3V 0°C to +125°C TO-263
MIC29310-5.0BT MIC29310-5.0WT 5.0V 0°C to +125°C TO-220
MIC29310-5.0BU MIC29310-5.0WU 5.0V 0°C to +125°C TO-263
MIC29312BT MIC29312WT Adj. 0°C to +125°C TO-220
MIC29312BU MIC29312WU Adj. 0°C to +125°C TO-263
Note:
1. RoHS compliant with “high-melting solder” exemption.
November 2006 3 MIC29310/29312
MIC29310/29312 Micrel
Electrical Characteristics
(Note 11)
T
J
= 25°C, bold values indicate 0°C ≤ T
J
≤ +125°C; unless noted
Parameter Condition Min Typ Max Units
Output Voltage 10mA ≤ I
O
≤ I
FL
, (V
OUT
+ 1V) ≤ V
IN
≤ 8V, Note 4 –2 2 %
Line Regulation I
O
= 10mA, (V
OUT
+ 1V) ≤ V
IN
≤ 16V 0.06 0.5 %
Load Regulation V
IN
= V
OUT
+ 1V, 10mA ≤ I
OUT
≤ I
FULL LOAD
, Notes 4, 8 0.2 1 %
ΔV
O
/ ΔT Output Voltage Temperature Coeffi cient, Note 8 20 100
ppm/°C
Dropout Voltage ΔV
OUT
= –1%, Note 5
I
O
= 100mA 80 200 mV
I
O
= 750mA 220 mV
I
O
= 1.5A 330 mV
I
O
= 3A 600 1000 mV
Ground Current I
O
= 750mA, V
IN
= V
OUT
+ 1V 5 20 mA
I
O
= 1.5A 15 mA
I
O
= 3A 60 150 mA
I
GNDDO
Ground Pin V
IN
= 0.5V less than specifi ed V
OUT
. I
OUT
= 10mA 2 3 mA
Current at Dropout
Current Limit V
OUT
= 0V, Note 6 3.0 3.8 A
Minimum Load Current 7 10 mA
e
n
, Output Noise Voltage C
L
= 10µF 400 µV
RMS
(10Hz to 100kHz) I
L
= 100mA C
L
= 33µF 260 µV
RMS
Reference (MIC29312 only)
Reference Voltage 10mA ≤ I
O
≤ I
FL
, V
OUT
+ 1V ≤ V
IN
≤ 8V, Note 4 1.215 1.265 V
MAX
Adjust Pin Bias Current 40 80 nA
120 nA
Reference Voltage Note 9 20
ppm/°C Temperature Coeffi cient
Adjust Pin Bias Current 0.1 nA/°C
Temperature Coeffi cient
Enable Input (MIC29312 only)
Input Logic Voltage low (off) 0.8 V
high (on) 2.4 V
Enable Pin Input Current V
EN
= V
IN
15 30 µA
75 µA
V
EN
= 0.8V – 2 µA
4 µA
Regulator Output Note 10 10 µA
Current in Shutdown 20 µA
Note 1. Exceeding the absolute maximum rating may damage the device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. Devices are ESD sensitive. Handling precautions recommended.
Note 4: Full Load current is defi ned as 3A for the MIC29310/29312. For testing, V
OUT
is programmed to 5V.
Note 5: Dropout voltage is defi ned as the input-to-output differential when the output voltage drops to 99% of its nominal value with V
OUT
+ 1V applied
to V
IN
.
Note 6: For this test, V
IN
is the larger of 8V or V
OUT
+ 3V.
Note 7: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current plus the ground
pin current.
Note 8: Output voltage temperature coeffi cient is defi ned as the worst case voltage change divided by the total temperature range.
Note 9: V
REF
≤ V
OUT
≤ (V
IN
– 1V), 2.4V ≤ V
IN
≤ 16V, 10mA < I
L
≤ I
FL
, T
J
≤ T
J(max).
Note 10: V
EN
≤ 0.8V and V
IN
≤ 8V, V
OUT
= 0.
Note 11: Specifi cation for packaged product only.
P1-P3P4-P6P7-P9P10-P12

MIC29312WU-TR

Mfr. #:
Buy MIC29312WU-TR
Manufacturer:
Microchip Technology / Micrel
Description:
LDO Voltage Regulators 3.0A LDO Adj. + Shutdown
Lifecycle:
New from this manufacturer.
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