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MIC29310-3.3BU

Part # MIC29310-3.3BU
Description IC REG LDO 3.3V 3A TO263-3
Category RECTIFIER
Availability In Stock
Qty 11
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1 + $1.13271
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Micrel
Date Code: 9934
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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

July 1999 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 fixed 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-efficiency “green” computer systems
• High-efficiency linear power supplies
• High-efficiency switching supply post regulator
• Battery-powered equipment
MIC29310/29312
3A Fast-Response LDO Regulator
Typical Application
IN OUT
GND
V
IN
V
OUT
Fixed Regulator Configuration
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 Configuration
Ordering Information
Part Number Voltage Junction Temp. Range Package
MIC29310-3.3BT 3.3V 0°C to +125°C TO-220-3
MIC29310-3.3BU 3.3V 0°C to +125°C TO-263-3
MIC29310-5.0BT 5.0V 0°C to +125°C TO-220-3
MIC29310-5.0BU 5.0V 0°C to +125°C TO-263-3
MIC29312BT Adj. 0°C to +125°C TO-220-5
MIC29312BU Adj. 0°C to +125°C TO-263-5
For applications requiring even lower dropout
voltage, input voltage greater than 16V, or an
error flag, see the MIC29300/29301/29302/
29303.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
MIC29310/29312 Micrel
MIC29310/29312 2 July 1999
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 Configuration
TAB
3 OUT
2 GND
1IN
MIC29310-x.xBT
TO-220 (T)
TAB
5 ADJ
4 OUT
3 GND
2IN
1EN
MIC29312-x.xBT
TO-220-5 (T)
TAB
3 OUT
2 GND
1IN
MIC29310-x.xBU
TO-263 (U)
TAB
5 ADJ
4 OUT
3 GND
2IN
1EN
MIC29312-x.xBU
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
July 1999 3 MIC29310/29312
MIC29310/29312 Micrel
Electrical Characteristics
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 %
∆V
O
/ ∆T Output VoltageTemperature Coefficient, Note 8 20 100 ppm/°C
Dropout Voltage ∆V
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 specified 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 710mA
e
n
, Output Noise Voltage C
L
= 10µF400µV
RMS
(10Hz to 100kHz) I
L
= 100mA C
L
= 33µF260µV
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 Coefficient
Adjust Pin Bias Current 0.1 nA/°C
Temperature Coefficient
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 defined as 3A for the MIC29310/29312. For testing, V
OUT
is programmed to 5V.
Note 5: Dropout voltage is defined 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 coefficient is defined 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.
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