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PDF FDMF8705 Data sheet ( Hoja de datos )
| Número de pieza | FDMF8705 | |
| Descripción | Driver plus FET Multi-chip Module | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de FDMF8705 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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April 2007
FDMF8705
Driver plus FET Multi-chip Module
tm
Benefits
General Description
Fully optimized system efficiency. Higher efficiency levels
The FDMF8705 is a fully optimized integrated 12V Driver plus
are achievable compared with conventional discrete
MOSFET power stage solution for high current synchronous
components.
buck DC-DC applications. The device integrates a driver IC and
Space savings of up to 50% PCB versus discrete solutions.
Higher frequency of operation.
Simpler system design and board layout. Reduced time in
component selection and optimization.
two Power MOSFETs into a space saving, 8mm x 8mm, 56-pin
Power88™ package. Fairchild Semiconductor’s integrated
approach optimizes the complete switching power stage with
regards to driver to FET dynamic performance, system
inductance and overall solution ON resistance. Package
Features
parasitics and problematical layouts associated with
conventional discrete solutions are greatly reduced. This
12V typical Input Voltage
Output current up to 18A
500KHz switching frequency capable
integrated approach results in significant board space saving,
therefore maximizing footprint power density. This solution is
based on the Intel™ DrMOS specification.
Internal adaptive gate drive
Applications
Integrated bootstrap diode
Peak Efficiency >85%
Under-voltage Lockout
Output disable for lost phase shutdown
Low profile SMD package
RoHS Compliant
Desktop and server non V-core buck converters.
CPU/GPU power train in game consoles and high end
desktop systems.
High-current DC-DC Point of Load (POL) converters
Networking and telecom microprocessor voltage regulators
www.DataSheet4U.coSm mall form factor voltage regulator modules
Powertrain Application Circuit
12V
CVCC
DISB
PWM
Input
VCIN
DISB
VIN
BOOT
PWM
VSWH
CGND PGND
CBOOT
OUTPUT
COUT
Figure 1. Powertrain Application Circuit
Ordering Information
Part
FDMF8705
Current Rating
Max
[A]
18
Input Voltage
Typical
[V]
12
Frequency
Max
[KHz]
500
©2007 Fairchild Semiconductor Corporation
FDMF8705 Rev. C
1
Device
Marking
FDMF8705
www.fairchildsemi.com
1 page  
Typical Characteristics
20
15
10
5 VIN = 12V
VOUT = 1.3V
fSW = 500KHz
L = 0.68uH
0
0 25 50 75 100 125 150
PCB Temperature, oC
Figure 4. Safe Operating Area vs. PCB Temperature
1.20
1.15
1.10
VIN = 12V
VOUT = 1.3V
IOUT = 18A
L = 0.68uH
1.05
1.00
0.95
0.90
200 250 300 350 400 450 500
Switching Frequency, KHz
Figure 6. Power Loss vs. Switching Frequency
6
VIN = 12V
5
VOUT = 1.3V
L = 0.68uH
4
fSW = 500KHz
3
2 fSW = 300KHz
1
0
0 3 6 9 12 15 18
ILOAD, A
Figure 5. Module Power Loss vs. Output Current
(VO measured at VSWH pin)
1.10
1.05
1.00
0.95
0.90
VOUT = 1.3V
IOUT = 18A
L = 0.68uH
fSW = 300KHz
678
9 10 11 12 13 14
Input Voltage, V
Figure 7. Power Loss vs. Input Voltage
15
1.10
1.08
1.05
1.03
1.00
0.98
VIN = 12V
VOUT = 1.3V
IOUT = 18A
L = 0.68uH
fSW = 300KHz
0.95
7 8 9 10 11 12 13
Driver Supply Voltage, V
Figure 8. Power Loss vs. Driver Supply Voltage
1.20
1.15
1.10
VIN = 12V
IOUT = 18A
L = 0.68uH
fSW = 300KHz
1.05
1.00
0.95
0.90
0.8
1.2 1.6 2.0 2.4 2.8
Output Voltage, V
Figure 9. Power Loss vs. Output Voltage
3.2
FDMF8705 Rev. C
5 www.fairchildsemi.com
5 Page 
Module Power Loss Measurement and
Calculation
Refer to Figure 27 for module power loss testing method. Power
loss calculation are as follows:
(a) PIN
(b) POUT
(c) PLOSS
= (VIN x IIN) + (VCIN x ICIN) (W)
= VO x IOUT (W)
= PIN - POUT (W)
PCB Layout Guideline
Figure 28. shows a proper layout example of FDMF8705 and
critical parts. All of high current flow path, such as VIN, VSWH,
VOUT and GND copper, should be short and wide for better and
stable current flow, heat radiation and system performance.
Following is a guideline which the PCB designer should
consider:
1. Input bypass capacitors should be close to VIN and GND pin
of FDMF8705 to help reduce input current ripple component
induced by switching operation.
2. It is critical that the VSWH copper has minimum area for
lower switching noise emission. VSWH copper trace should
also be wide enough for high current flow. Other signal routing
path, such as PWM IN and BOOT signal, should be considered
with care to avoid noise pickup from VSWH copper area.
3. Output inductor location should be as close as possible to the
FDMF8705 for lower power loss due to copper trace.
4. Place ceramic bypass capacitor and boot capacitor as close
to VCIN and BOOT pin of FDMF8705 in order to supply stable
power. Routing width and length should also be considered.
5. Use multiple Vias on each copper area to interconnect each
top, inner and bottom layer to help smooth current flow and heat
conduction. Vias should be relatively large and of reasonable
inductance.
DISB
PWM input
CBOOT
VCIN
VIN
ICIN
A
CVCIN
IIN
A
CVIN
PWM
VCIN
DISB
FDMF8705
BOOT
VSWH
VIN CGND
PGND
L
V VO
IOUT
A
COUT
IC Ground
Power Ground
Figure 27. Power Loss Measurement Block Diagram
VOUT
FDMF8705 Rev. C
Figure 28. Typical PCB Layout Example (Top View)
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet FDMF8705.PDF ] | |
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