MIC29710/29712
Micrel
MIC29710/29712
7.5A Fast-Response LDO Regulator
Final Information
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 MIC29710/2 is available in two versions: the three pin
fixed output MIC29710 and the five pin adjustable output
voltage MIC29712. All versions are fully protected against
overcurrent faults, reversed lead insertion, overtemperature
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 may
be continuously enabled by connecting EN to IN.
The MIC29710/2 is available in the standard three and five
pin TO-220 package with an operating junction temperature
range of 0°C to +125°C. The MIC29710 is also available in the
5-lead TO-263 package.
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
For applications requiring even lower dropout voltage or input
voltage greater than 16V, see the MIC29750/29752.
Ordering Information
Part Number
MIC29710-3.3BT
MIC29710-5.0BT
MIC29712BT
* Junction Temperature
Temp. Range*
0°C to +125°C
0°C to +125°C
0°C to +125°C
Voltage
3.3V
5.0V
Adj.
Current
7.5A
7.5A
7.5A
Package
TO-220-3
TO-220-3
TO-220-5
Typical Application
MIC29710
V
IN
IN
OUT
V
OUT
On
Off
MIC29712
EN
IN
GND
OUT
R1
V
IN
ADJ
R2
V
OUT
GND
V
OUT
= 1.240
R1
1
R2
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
March 2001
1
MIC29710/29712
MIC29710/29712
Micrel
Pin Configuration
1 2 3
12345
MIC29710BT
On all devices, the Tab is grounded.
MIC29712BT
Pin Description
3-Pin TO-220 (MIC29710)
Pin Number
1
2
3
Pin Name
IN
GND
OUT
Pin Function
Unregulated Input: +16V maximum supply.
Ground: Internally connected to tab (ground).
Regulated Output
5-Pin TO-220 (MIC29712)
Pin Number
1
2
3
4
5
Pin Name
EN
IN
GND
OUT
ADJ
Pin Function
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.
Absolute Maximum Ratings
Input Supply Voltage,
Note 1 ......................
–0.7 V to +20V
Power Dissipation .................................... Internally Limited
Storage Temperature Range ................... –65°C to +150°C
Lead Temperature (Soldering, 5 sec.) ...................... 260°C
Operating Ratings
Operating Junction Temperature ................. 0°C to +125°C
θ
JC
(TO-220) ............................................................. 2°C/W
θ
JA
(TO-220) ........................................................... 55°C/W
MIC29710/29712
2
March 2001
MIC29710/29712
Micrel
Electrical Characteristics
(Note 9)
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 2
I
O
= 10mA, (V
OUT
+ 1V)
≤
V
IN
≤
8V
V
IN
= V
OUT
+ 1V, 10mA
≤
I
OUT
≤
7.5A,
Notes 2, 6
∆V
O
/∆T,
Note 6
∆V
OUT
= – 1%, (Note 3)
MIC29710/29712
I
O
= 100mA
I
O
= 750mA
I
O
= 1.5A
I
O
= 3A
I
O
= 5A
I
O
= 7.5A
MIC29710/29712
I
O
= 750mA, V
IN
= V
OUT
+ 1V
I
O
= 1.5A
I
O
= 3A
I
O
= 5A
I
O
= 7.5A
Min
–2
0.06
0.2
20
Typ
Max
2
0.5
1
100
Units
%
%
%
ppm/°C
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
375
2
15
I
GNDDO
Ground Pin
Current at Dropout
Current Limit
e
n
, Output Noise Voltage
(10Hz to 100kHz)
V
OUT
= 5.0V
Reference (MIC29712 only)
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 4
C
L
= 47µF
I
o
= 100mA
10mA
≤
I
O
≤
7.5A, V
OUT
+ 1V
≤
V
IN
≤
8V,
Note 2
1.215
1.240
40
1.265
80
120
V
MAX
nA
nA
ppm/°C
nA/°C
Note 7
20
0.1
March 2001
3
MIC29710/29712
MIC29710/29712
Parameter
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
General Note:
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Micrel
Conditions
Min
Typical
Max
Units
0.8
2.4
15
–
10
20
30
75
2
4
V
V
µA
µA
µA
µA
µA
µA
(Note 8)
Devices are ESD sensitive. Handling precautions are recommended.
The maximum continuous supply voltage is 16V.
For testing, MIC29712 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
– 1 V), 2.4V
≤
V
IN
≤
8V, 10mA < I
L
≤
7.5A, T
J
≤
T
J MAX.
V
EN
≤
0.8V and V
IN
≤
16V, V
OUT
= 0.
Specification for packaged product only.
Block Diagram
IN
EN
On/Off
Bias
O.V.
I
LIMIT
28V
16V
Reference
OUT
Feed-
back
Thermal
Shut-
down
ADJ
GND
MIC29710/29712
4
March 2001
MIC29710/29712
Micrel
Typical Characteristics
MIC29712 Load Transient Response
(See Test Circuit Schematic)
MIC29712
EN
V
IN
= V
OUT
+ 1V
IN
GND
ADJ
49.9k
1%
OUT
0.1µF
93.1k
1%
OUTPUT VOLTAGE
V
OUT
3.525V nominal
6
×
330µF
AVX
TPSE337M006R0100
tantalum
+50mV
3.525V
–50mV
1ms/division
8A
6A
4A
2A
200mA
0A
V
OUT
load (not shown):
Intel® Power Validator
MIC29712 Load Transient Response Test Circuit
MIC29712 Line Transient Response
with 10mA Load, 10µF Output Capacitance
LOAD CURRENT
MIC29712 Line Transient Response
with 10mA Load, 100µF Output Capacitance
INPUT VOLTAGE
6.525V
4.525V
200µs/division
I
OUT
= 10mA
C
OUT
=10µF
INPUT VOLTAGE
6.525V
4.525V
200µs/division
I
OUT
= 10mA
C
OUT
= 100µF
OUTPUT VOLTAGE
+20mV
3.525V
–20mV
OUTPUT VOLTAGE
+20mV
3.525V
–20mV
MIC29710/2 Dropout Voltage
vs. Output Current
0.6
MIC29710/2 Dropout Voltage
vs. Temperature
1.0
4
MIC29710-3.3
Dropout Characteristics
DROPOUT VOLTAGE (V)
DROPOUT VOLTAGE (V)
0.5
0.4
0.3
0.2
0.1
0
0
2
4
6
OUTPUT CURRENT (A)
8
0.8
0.6
0.4
0.2
0
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
I
LOAD
= 7.5A
OUTPUT VOLTAGE (V)
3
I
LOAD
= 10mA
2
I
LOAD
= 7.5A
1
0
0
4
8
12
INPUT VOLTAGE (V)
16
March 2001
5
MIC29710/29712
FPGA/CPLD
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