MIC29310/29312
Micrel
MIC29310/29312
3A Fast-Response LDO Regulator
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.
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
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
Applications
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.
For applications requiring even lower dropout
Ordering Information
voltage, input voltage greater than 16V, or an
Part Number
Voltage
error flag, see the MIC29300/29301/29302/
MIC29310-3.3BT
3.3V
29303.
MIC29310-3.3BU
MIC29310-5.0BT
MIC29310-5.0BU
MIC29312BT
MIC29312BU
3.3V
5.0V
5.0V
Adj.
Adj.
Junction Temp. Range
0°C to +125°C
0°C to +125°C
0°C to +125°C
0°C to +125°C
0°C to +125°C
0°C to +125°C
Package
TO-220-3
TO-263-3
TO-220-3
TO-263-3
TO-220-5
TO-263-5
Typical Application
MIC29312
On
Off
EN
IN
GND
OUT
R1*
ADJ
R2*
V
OUT
V
IN
IN
OUT
GND
V
OUT
V
IN
V
OUT
= 1. 240
R1
+1
R2
* For best performance, total series resistance
(R1 + R2) should be small enough to pass
the minimum regulator load current of 10mA.
Fixed Regulator Configuration
Adjustable Regulator Configuration
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
July 1999
1
MIC29310/29312
MIC29310/29312
Micrel
Pin Configuration
3
TAB
OUT
TAB
3
2
1
OUT
GND
IN
2
1
GND
IN
MIC29310-x.xBT
TO-220 (T)
MIC29310-x.xBU
TO-263 (U)
5
4
3
2
1
ADJ
OUT
GND
IN
EN
5
4
3
2
1
ADJ
OUT
GND
IN
EN
TAB
TAB
MIC29312-x.xBT
TO-220-5 (T)
MIC29312-x.xBU
TO-263-5 (U)
Pin Description
Pin Number
MIC29310
Pin Number
MIC29312
1
1
2,
TAB
3
2
3,
TAB
4
5
Pin Name
EN
IN
GND
OUT
ADJ
Pin Function
Enable (Input): Active-high, logic-level enable/shutdown control.
Unregulated Input: +16V maximum supply.
Ground: Ground pin and
TAB
are internally connected.
Regulator Output
Ouput Voltage Adjust: 1.24V feedback from external resistive divider.
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
MIC29310/29312
2
July 1999
MIC29310/29312
Micrel
Electrical Characteristics
T
J
= 25°C,
bold
values indicate 0°C
≤
T
J
≤
+125°C; unless noted
Parameter
Output Voltage
Line Regulation
Load Regulation
∆V
O
/
∆T
Dropout Voltage
Condition
10mA
≤
I
O
≤
I
FL
, (V
OUT
+ 1V)
≤
V
IN
≤
8V,
Note 4
I
O
= 10mA, (V
OUT
+ 1V)
≤
V
IN
≤
16V
V
IN
= V
OUT
+ 1V, 10mA
≤
I
OUT
≤
I
FULL LOAD
,
Notes 4, 8
Output Voltage Temperature Coefficient,
Note 8
∆V
OUT
= –1%,
Note 5
I
O
= 100mA
I
O
= 750mA
I
O
= 1.5A
I
O
= 3A
I
O
= 750mA, V
IN
= V
OUT
+ 1V
I
O
= 1.5A
I
O
= 3A
V
IN
= 0.5V less than specified V
OUT
. I
OUT
= 10mA
V
OUT
= 0V,
Note 6
C
L
= 10µF
C
L
= 33µF
10mA
≤
I
O
≤
I
FL
, V
OUT
+ 1V
≤
V
IN
≤
8V,
Note 4
1.215
40
Note 9
20
0.1
3.0
Min
–2
0.06
0.2
20
80
220
330
600
5
15
60
2
3.8
7
400
260
10
Typ
Max
2
0.5
1
100
200
Units
%
%
%
ppm/°C
mV
mV
mV
mV
mA
mA
mA
mA
A
mA
µV
RMS
µV
RMS
1.265
80
120
V
MAX
nA
nA
ppm/°C
nA/°C
1000
20
150
3
Ground Current
I
GNDDO
Ground Pin
Current at Dropout
Current Limit
Minimum Load Current
e
n
, Output Noise Voltage
(10Hz to 100kHz) I
L
= 100mA
Reference (MIC29312 only)
Reference Voltage
Adjust Pin Bias Current
Reference Voltage
Temperature Coefficient
Adjust Pin Bias Current
Temperature Coefficient
Enable Input (MIC29312 only)
Input Logic Voltage
Enable Pin Input Current
low (off)
high (on)
V
EN
= V
IN
V
EN
= 0.8V
0.8
2.4
15
–
10
20
30
75
2
4
V
V
µA
µA
µA
µA
µA
µA
Regulator Output
Current in Shutdown
Note 1.
Note 2.
Note 3.
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended.
Full Load current is defined as 3A for the MIC29310/29312. For testing, V
OUT
is programmed to 5V.
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
.
For this test, V
IN
is the larger of 8V or V
OUT
+ 3V.
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.
Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
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.
July 1999
3
MIC29310/29312
MIC29310/29312
Micrel
Typical Characteristics
MIC29312 Load Transient Response
(See Test Circuit Schematic)
V
OUT
3.525V nominal
0.1µF
93.1k
1%
4
×
330µF
AVX
TPSE337M006R0100
tantalum
MIC29312
EN
V
IN
= V
OUT
+ 1V
IN
GND
OUT
ADJ
49.9k
1%
OUTPUT VOLTAGE
+20mV
3.525V
–20mV
1ms/division
V
OUT
load (not shown):
Intel® Power Validator
LOAD CURRENT
MIC29312 Load Transient Response Test Circuit
3A
200mA
0mA
MIC29312 Line Transient Response
with 3A Load, 10µF Output Capacitance
MIC29312 Line Transient Response
with 3A Load, 100µF Output Capacitance
INPUT VOLTAGE
6.525V
4.525V
INPUT VOLTAGE
6.525V
4.525V
200µs/division
I
OUT
= 3A
C
OUT
=10µF
200µs/division
I
OUT
= 3A
C
OUT
= 100µF
OUTPUT VOLTAGE
+20mV
3.525V
–20mV
OUTPUT VOLTAGE
+20mV
3.525V
–20mV
MIC2931x Dropout Voltage
vs. Output Current
0.60
0.50
0.40
0.30
0.20
0.10
0.00
0
1
2
OUTPUT CURRENT (A)
3
1
MIC2931x Dropout Voltage
vs. Temperature
OUTPUT VOLTAGE (V)
5.0
4.0
MIC29310-3.3
Dropout Characteristics
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (V)
0.8
0.6
0.4
0.2
0
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
I
LOAD
= 3A
I
LOAD
= 10mA
3.0
2.0
I
LOAD
= 3A
1.0
0.0
0
2
4
INPUT VOLTAGE (V)
6
July 1999
5
MIC29310/29312
分立器件
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