MICREL MIC29712BT, MIC29710-3.3BT, MIC29710-5.0BT Datasheet
MIC29710/29712 Micrel
MIC29710/29712
7.5A Fast-Response LDO Regulator
General Description
The MIC29710 and MIC29712 are high-current, high-accuracy, 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.
For applications requiring even lower dropout voltage or input
voltage greater than 16V, see the MIC29750/29752.
Ordering Information
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)
• No minimum load current
• 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
T ypical Application
MIC29710
V
IN
IN
GND
Fixed Regulator Configuration
OUT
Part Number Temp. Range* Voltage Current Package
MIC29710-3.3BT 0°C to +125°C 3.3V 7.5A TO-220-3
MIC29710-5.0BT 0°C to +125°C 5.0V 7.5A TO-220-3
MIC29712BT 0°C to +125°C Adj. 7.5A TO-220-5
* Junction Temperature
MIC29712
V
OUT
On
Off
V
IN
V
EN
IN
OUT
GND
= 1.240
OUT
ADJ
R1
R2
R1
R2
1
V
Adjustable Regulator Configuration
OUT
3-104 1997
MIC29710/29712 Micrel
Pin Configuration
1 2 3
MIC29710BT
On all devices, the Tab is grounded.
Pin Description
3-Pin TO-220 (MIC29710)
Pin Number Pin Name Pin Function
1 IN Unregulated Input: +16V maximum supply.
2 GND Ground: Internally connected to tab (ground).
3 OUT Regulated Output
5-Pin TO-220 (MIC29712)
Pin Number Pin Name Pin Function
1 EN Enable (Input): Logic-level ON/OFF control.
2 IN Unregulated Input: +16V maximum supply.
3 GND Ground: Internally connected to tab (ground).
4 OUT Regulated Output
5 ADJ Output Voltage Adjust: 1.240V feedback from external resistive divider.
12345
MIC29712BT
3
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
1997 3-105
Operating Ratings
Operating Junction Temperature .................0°C to +125°C
θJC (TO-220) .............................................................2°C/W
θJA (TO-220) ...........................................................55°C/W
MIC29710/29712 Micrel
Electrical Characteristics
All measurements at TJ = 25°C unless otherwise noted. Bold values are guaranteed across the operating temperature range.
Parameter Condition Min Typ Max Units
Output Voltage 10mA ≤ IO ≤ 7.5A, (V
Line Regulation IO = 10mA, (V
Load Regulation VIN = V
Output Voltage ∆V
Temperature Coefficient
Dropout Voltage ∆V
/∆T, Note 6 20 100 ppm/°C
O
OUT
OUT
+ 1V, 10mA ≤ I
OUT
= – 1%, (Note 3)
MIC29710/29712 I
Ground Current MIC29710/29712 I
Ground Pin VIN = 0.5V less than specified V
I
GNDDO
Current at Dropout
Current Limit MIC29710/29712 V
, Output Noise Voltage CL = 47µFI
e
n
(10Hz to 100kHz)
= 5.0V
VOUT
Reference (MIC29712 only)
Reference Voltage 10mA ≤ IO ≤ 7.5A, V
Adjust Pin Bias Current 40 80 nA
Reference Voltage Note 7 20 ppm/°C
Temperature Coefficient
Adjust Pin Bias Current 0.1 nA/°C
Temperature Coefficient
+ 1V) ≤ VIN ≤ 8V, Note 2 –2 2 %
OUT
+ 1V) ≤ VIN ≤ 8V 0.06 0.5 %
≤ 7.5A, Notes 2, 6 0.2 1 %
OUT
= 100mA 80 200 mV
O
I
= 750mA 180 mV
O
= 1.5A 220 mV
I
O
= 3A 300 mV
I
O
I
= 5A 450 mV
O
IO = 7.5A 700 1000 mV
= 750mA, VIN = V
O
I
= 1.5A 20 mA
O
= 3A 36 mA
I
O
= 5A 100 mA
I
O
IO = 7.5A 250 375 mA
. I
OUT
= 0V, Note 4 11 15 A
OUT
= 100mA 260 µV
o
+ 1V ≤ VIN ≤ 8V, Note 2 1.215 1.240 1.265 V
OUT
= 10mA 1 2 mA
OUT
+ 1V 6 20 mA
OUT
MAX
120 nA
RMS
3-106 1997
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