MIC29710/29712
7.5A Fast-Response LDO Regulator
General Description
The MIC29710 and MIC29712 are high-current, high-accu-
racy, low-dropout voltage regulators featuring fast transient
recovery from input voltage surges and output load current
changes. These regulators use a PNP pass element that
features Micrel’s proprietary Super ßeta PNP
®
process.
The MIC29710 is available in the 3-pin fixed output and
the MIC29712 is available in the 5-pin adjustable output
voltage. Both versions are fully protected against
overcurrent faults, reversed lead insertion, over-
temperature operation, and positive and negative transient
voltage spikes.
A TTL compatible enable (EN) control pin supports
external on/off control. If on/off control is not required, the
device maybe continuously enabled by connecting EN to
IN.
The MIC29710 is available in the standard 3-pin TO-220
package the MIC29712 is available in the 5-pin TO-220
package with an operating junction temperature range of
0°C to +125°C.
For applications requiring even lower dropout voltage or
input voltage greater than 16V, see the MIC29750/29752.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
•
•
•
•
•
•
•
Fast transient response
7.5A current capability
700mV dropout voltage at full load
Low ground current
Accurate 2% guaranteed tolerance
“Zero” current shutdown mode (MIC29712)
Fixed voltage and adjustable versions
Applications
•
Pentium
®
, Pentium
®
Plus, and Power PC
®
processor
supplies
•
High-efficiency “green” computer systems
•
High-efficiency linear power supplies
•
High-efficiency switching supply post regulator
•
Battery-powered equipment
Typical Application
⎛
R1
⎞
V
OUT
=
1.240
⎜
+
1
⎟
⎝
R2
⎠
Fixed Regulator Configuration
Adjustable Regulator Configuration
Super ßeta PNP is a registered trademark of Micrel, Inc. Pentium is a registered trademark of Intel Corporation.
PowerPC is a registered trademark of IBM Corporation.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
October 2006
1
M9999-101906
Micrel, Inc.
MIC29710/29712
Ordering Information
(1)
Part Number
Standard
MIC29710-3.3BT
MIC29710-5.0BT
MIC29712BT
Note:
*
RoHS Compliant with ‘high-melting solder’ exemption.
RoHS Compliant*
MIC29710-3.3WT
MIC29710-5.0WT
MIC29712WT
Voltage
3.3V
5.0V
Adj
Junction
Temp. Range
0°C to +125°C
0°C to +125°C
0°C to +125°C
Package
3-Pin TO-220
3-Pin TO-220
5-Pin TO-220
Pin Configuration
1 2 3
MIC29710BT/WT
On both devices, the Tab is grounded
12345
MIC29712BT/WT
Pin Description
Pin Number
3-Pin TO-220
–
1
2
3
–
Pin Number
5-Pin TO-220
1
2
3
4
5
Pin Name
EN
IN
GND
OUT
ADJ
Pin Name
Enable (Input): Logic-level ON/OFF control.
Unregulated Input: +16V maximum supply.
Ground: Internally connected to tab (ground).
Regulated Output
Output Voltage Adjust: 1.240V feedback from external resistive
divider.
October 2006
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M9999-101906
Micrel, Inc.
MIC29710/29712
Absolute Maximum Ratings
Input Supply Voltage (V
IN
)
(1)
......................... –0.7V to +20V
Power Dissipation. ....................................Internally Limited
Lead Temperature (soldering, 5 sec.)........................ 260°C
Storage Temperature (T
s
) ........................... –65°C to 150°C
EDS Rating
(2)
Operating Ratings
Junction Temperature (T
J
) ............................ 0°C to +125°C
Thermal Resistance
TO-220 (
θ
JC
) ........................................................2°C/W
TO-220 (
θ
JA
) ......................................................55°C/W
Electrical Characteristics
(3)
All measurements at T
J
= 25°C unless otherwise noted.
Bold
values are guaranteed across the operating temperature range.
Parameter
Output Voltage
Line Regulation
Load Regulation
Output Voltage
Temperature Coefficient
Dropout Voltage
Condition
10mA
≤
I
O
≤
7.5A, (V
OUT
+ 1V)
≤
V
IN
≤
8V,
Note 4
I
O
= 10mA, (V
OUT
+ 1V)
≤
V
IN
≤
8V
V
IN
= V
OUT
+ 1V, 10mA
≤
I
OUT
≤
7.5A,
Notes 4, 8
∆V
O
/∆T,
Note 8
∆V
OUT
= – 1%,
Note 5
MIC29710/29712
Min
–2
0.06
0.2
20
Typ
Max
+2
0.5
1
100
Units
%
%
%
ppm/°C
I
O
= 100mA
I
O
= 750mA
I
O
= 1.5A
I
O
= 3A
I
O
= 5A
I
O
= 7.5A
I
O
= 750mA, V
IN
= V
OUT
+ 1V
I
O
= 1.5A
I
O
= 3A
I
O
= 5A
I
O
= 7.5A
80
180
220
300
450
700
6
20
36
100
250
1
11
260
200
1000
20
mV
mV
mV
mV
mV
mV
mA
mA
mA
mA
mA
mA
A
µV
RMS
Ground Current
MIC29710/29712
375
2
15
I
GNDDO
Ground Pin
Current at Dropout
Current Limit
e
n
, Output Noise Voltage
(10Hz to 10kHz)
V
OUT
= 5.0V
Reference Voltage
Adjust Pin Bias Current
Reference Voltage
Temperature Coefficient
Adjust Pin Bias Current
Temperature Coefficient
V
IN
= 0.5V less than specified V
OUT
. I
OUT
= 10mA
MIC29710/29712 V
OUT
= 0V,
Note 6
C
L
= 47µF
I
O
= 100mA
Reference (MIC29712 only)
10mA
≤
I
O
≤
7.5A, V
OUT
+ 1V
≤
V
IN
≤
8V,
Note 4
1.215
1.240
40
Note 9
20
0.1
1.265
80
120
V
MAX
nA
nA
ppm/°C
nA/°C
Enable Input (MIC29712 only)
Input Logic Voltage
Enable (EN) Pin
Input Current
Low (Off)
High (On)
V
EN
= V
IN
V
EN
= 0.8V
Regulator Output
Current in Shutdown
Note 10
0.8
2.4
15
–
10
20
30
75
2
4
V
V
µA
µA
µA
µA
µA
µA
October 2006
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M9999-101906
Micrel, Inc.
Notes:
1. The maximum continuous supply voltage is 16V.
2. Devices are ESD sensitive. Handling precautions are recommended.
3. Specification for packaged product only.
4. For testing, MIC29712 V
OUT
is programmed to 5V.
MIC29710/29712
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
.
6. For this test, V
IN
is the larger of 8V or V
OUT
+ 3V.
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.
8. Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
9. V
REF
≤
V
OUT
≤
(V
IN
– 1 V), 2.4V
≤
V
IN
≤
8V, 10mA < I
L
≤
7.5A, T
J
≤
T
J MAX
.
10. V
EN
≤
0.8V and V
IN
≤
16V, V
OUT
= 0.
October 2006
4
M9999-101906
Micrel, Inc.
MIC29710/29712
Typical Characteristics
MIC29710 Load Transient Response Test Circuit
October 2006
5
M9999-101906
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