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PDF IR3447 Data sheet ( Hoja de datos )
| Número de pieza | IR3447 | |
| Descripción | Synchronous Buck Regulator | |
| Fabricantes | International Rectifier | |
| Logotipo |  |
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25A Highly Integrated SupIRBuckTM
Single-Input Voltage, Synchronous Buck Regulator
IR3447
FEATURES
Single 5V to 21V application
Wide Input Voltage Range from 1.5V to 21V with
external Vcc
Output Voltage Range: 0.6V to 0.86*PVin
0.5% accurate Reference Voltage
Enhanced line/load regulation with Feed-Forward
Programmable Switching Frequency up to 1.5MHz
Internal Digital Soft-Start
Enable input with Voltage Monitoring Capability
Remote Sense Amplifier with True Differential
Voltage Sensing
Thermally compensated current limit and Hiccup
Mode Over Current Protection
Smart LDO to enhance efficiency
External synchronization with Smooth Clocking
Dedicated output voltage sensing for power good
indication and overvoltage protection which
remains active even when Enable is low.
Enhanced Pre-Bias Start up
Body Braking to improve transient
Integrated MOSFET drivers and Bootstrap diode
Thermal Shut Down
Post Package trimmed rising edge dead-time
Programmable Power Good Output
Small Size 5mm x 6mm PQFN
Operating Junction Temp: -40oC<Tj<125oC
Lead-free, Halogen-free and RoHS Compliant
DESCRIPTION
The IR3447 SupIRBuckTM is an easy-to-use, fully
integrated and highly efficient DC/DC regulator. The
onboard PWM controller and MOSFETs make IR3447
a space-efficient solution, providing accurate power
delivery for low output voltage and high current
applications.
IR3447 is a versatile regulator which offers
programmability of switching frequency and current
limit while operating in wide input and output voltage
range.
The switching frequency is programmable from 300
kHz to 1.5MHz for an optimum solution.
It also features important protection functions, such as
Over Voltage Protection (OVP), Pre-Bias startup,
hiccup current limit and thermal shutdown to give
required system level security in the event of fault
conditions.
APPLICATIONS
Server Application
Distributed Point of Load Power Architectures
Set Top Box Application
Power Supplies
ORDERING INFORMATION
Base Part
Number
Package Type
IR3447
PQFN 5mm x 6mm
IR3447
PQFN 5mm x 6mm
Standard Pack
Form
Quantity
Tape and Reel
750
Tape and Reel
4000
Orderable Part
Number
IR3447MTR1PBF
IR3447MTRPBF
1 www.irf.com © 2013 International Rectifier
July 17, 2013
Free
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IR3447
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
These are stress ratings only and functional operation of the device at these or any other conditions beyond those
indicated in the operational sections of the specifications are not implied.
PVin
Vin
VCC
SW
BOOT
BOOT to SW
Input/Output pins
RS+, RS-, RSo, PGD, Enable, OCset
PGND to LGND, RS- to LGND
Junction Temperature Range
Storage Temperature Range
Machine Model
ESD
Human Body Model
Charged Device Model
Moisture Sensitivity level
RoHS Compliant
-0.3V to 25V
-0.3V to 25V
-0.3V to 8V (Note 1)
-0.3V to 25V (DC), -4V to 25V (AC, 100ns)
-0.3V to 33V
-0.3V to VCC + 0.3V (Note 2)
-0.3V to 3.9V
-0.3V to 8V (Note 1)
-0.3V to + 0.3V
-40°C to 150°C
-55°C to 150°C
Class A
Class 1C
Class III
JEDEC Level 3 @ 260°C
Yes
Note:
1. VCC must not exceed 7.5V for Junction Temperature between -10°C and -40°C.
2. Must not exceed 8V.
THERMAL INFORMATION
Thermal Resistance, Junction to Case Top (θJC_TOP)
Thermal Resistance, Junction to PCB (θJB)
Thermal Resistance, Junction to Ambient (θJA) (Note 3)
31.5°C/W
2.41°C/W
14.7°C/W
Note:
3. Thermal resistance (θJA) is measured with components mounted on a high effective thermal conductivity
test board.
5 www.irf.com © 2013 International Rectifier
July 17, 2013
Free Datasheet http://www.datasheet4u.com/
5 Page 
IR3447
TYPICAL EFFICIENCY AND POWER LOSS CURVES
PVin = 12V, Vin = VCC = 5V, Io=0-25A, Fs= 600kHz, Room Temperature, No Air Flow. Note that the losses of
the inductor, input and output capacitors are also considered in the efficiency and power loss curves. The table
below shows the indicator used for each of the output voltages in the efficiency measurement.
VOUT (V)
1.0
1.2
1.8
3.3
LOUT (uH)
0.215
0.215
0.311
0.68
P/N
PCDC1008-R215EMO (Cyntec)
PCDC1008-R215EMO (Cyntec)
FP1109-R33-R (Coiltronics)
7443320068 (Wurth Elektronik)
DCR (mΩ)
0.29
0.29
0.42
0.72
11 www.irf.com © 2013 International Rectifier
July 17, 2013
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
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| PDF Descargar | [ Datasheet IR3447.PDF ] | |
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