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PDF FDMF6707C Data sheet ( Hoja de datos )
| Número de pieza | FDMF6707C | |
| Descripción | High-Frequency DrMOS Module | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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March 2012
FDMF6707C - Extra-Small, High-Performance, High-
Frequency DrMOS Module
Benefits
Ultra-Compact 6x6mm PQFN, 72% Space-Saving
Compared to Conventional Discrete Solutions
Fully Optimized System Efficiency
Clean Switching Waveforms with Minimal Ringing
High-Current Handling
Features
Over 93% Peak-Efficiency
High-Current Handling of 50A
High-Performance PQFN Copper-Clip Package
3-State 5.0V PWM Input Driver
Skip-Mode SMOD# (Low-Side Gate Turn Off) Input
Thermal Warning Flag for Over-Temperature
Condition
Driver Output Disable Function (DISB# Pin)
Internal Pull-Up and Pull-Down for SMOD# and
DISB# Inputs, Respectively
Fairchild PowerTrench® Technology MOSFETs for
Clean Voltage Waveforms and Reduced Ringing
Fairchild SyncFET™ (Integrated Schottky Diode)
Technology in the Low-Side MOSFET
Integrated Bootstrap Schottky Diode
Adaptive Gate Drive Timing for Shoot-Through
Protection
Under-Voltage Lockout (UVLO)
Optimized for Switching Frequencies up to 1MHz
Low-Profile SMD Package
Fairchild Green Packaging and RoHS Compliance
Based on the Intel® 4.0 DrMOS Standard
Description
The XS™ DrMOS family is Fairchild’s next-generation,
fully optimized, integrated MOSFET plus driver power
stage solution for high-current, high-frequency,
synchronous buck DC-DC applications. The FDMF6707C
integrates a driver IC, two power MOSFETs, and a
bootstrap Schottky diode into a thermally enhanced,
ultra-compact 6x6mm PQFN package.
With an integrated approach, the complete switching
power stage is optimized for driver and MOSFET
dynamic performance, system inductance, and power
MOSFET RDS(ON). XS™ DrMOS uses Fairchild's high-
performance PowerTrench® MOSFET technology,
which dramatically reduces switch ringing, eliminating
the snubber circuit in most buck converter applications.
A new driver IC with reduced dead times and
propagation delays further enhances performance. A
thermal warning function indicates potential over-
temperature situations. FDMF6707C also incorporates
features such as Skip Mode (SMOD) for improved light-
load efficiency, along with a three-state 5V PWM input
for compatibility with a wide range of PWM controllers.
Applications
High-Performance Gaming Motherboards
Compact Blade Servers, V-Core and Non-V-Core
DC-DC Converters
Desktop Computers, V-Core and Non-V-Core
DC-DC Converters
Workstations
High-Current DC-DC Point-of-Load (POL)
Converters
Networking and Telecom Microprocessor Voltage
Regulators
Small Form-Factor Voltage Regulator Modules
Ordering Information
Part Number Current Rating
Package
Top Mark
FDMF6707C
50A 40-Lead, Clipbond PQFN DrMOS, 6.0mm x 6.0mm Package FDMF6707C
© 2011 Fairchild Semiconductor Corporation
FDMF6707C • Rev. 1.0.1
www.fairchildsemi.com
Free Datasheet http://www.datasheet4u.com/
1 page  
Electrical Characteristics
Typical values are VIN = 12V, VCIN = 5V, VDRV = 5V, and TA = +25°C unless otherwise noted.
Symbol
Parameter
Basic Operation
IQ
UVLO
Quiescent Current
UVLO Threshold
UVLO_Hyst UVLO Hysteresis
PWM Input (VCIN = VDRV = 5V ±10%)
RUP_PWM Pull-Up Impedance
RDN_PWM Pull-Down Impedance
VIH_PWM PWM High Level Voltage
VTRI_HI 3-State Upper Threshold
VTRI_LO 3-State Lower Threshold
VIL_PWM PWM Low Level Voltage
tD_HOLD-OFF 3-State Shut-off Time
VHiZ_PWM 3-State Open Voltage
PWM Input (VCIN = VDRV = 5V ±5%)
RUP_PWM Pull-Up Impedance
RDN_PWM Pull-Down Impedance
VIH_PWM PWM High Level Voltage
VTRI_HI 3-State Upper Threshold
VTRI_LO 3-State Lower Threshold
VIL_PWM PWM Low Level Voltage
tD_HOLD-OFF 3-State Shut-Off Time
VHiZ_PWM 3-State Open Voltage
DISB# Input
VIH_DISB High-Level Input Voltage
VIL_DISB
IPLD
Low-Level Input Voltage
Pull-Down Current
tPD_DISBL Propagation Delay
tPD_DISBH Propagation Delay
SMOD# Input
VIH_SMOD High-Level Input Voltage
VIL_SMOD Low-Level Input Voltage
IPLU Pull-Up Current
tPD_SLGLL Propagation Delay
tPD_SHGLH Propagation Delay
Condition
Min. Typ. Max. Unit
IQ=IVCIN+IVDRV, PWM=LOW or HIGH or Float
2 mA
VCIN Rising
2.9 3.1 3.3 V
0.4 V
10
10
3.04 3.55 4.05
2.95 3.45 3.94
0.98 1.25 1.52
0.84 1.15 1.42
160 200
2.2 2.5 2.8
kΩ
kΩ
V
V
V
V
ns
V
10
10
3.22 3.55 3.87
3.13 3.45 3.77
1.04 1.25 1.46
0.90 1.15 1.36
160 200
2.3 2.5 2.7
kΩ
kΩ
V
V
V
V
ns
V
PWM=GND, Delay Between DISB# from
HIGH to LOW to GL from HIGH to LOW
PWM=GND, Delay Between DISB# from
LOW to HIGH to GL from LOW to HIGH
2V
0.8 V
10 µA
25 ns
25 ns
2V
0.8 V
10 µA
PWM=GND, Delay Between SMOD# from
HIGH to LOW to GL from HIGH to LOW
10
ns
PWM=GND, Delay Between SMOD# from
LOW to HIGH to GL from LOW to HIGH
10
ns
Continued on the following page…
© 2011 Fairchild Semiconductor Corporation
FDMF6707C • Rev. 1.0.1
5
www.fairchildsemi.com
Free Datasheet http://www.datasheet4u.com/
5 Page 
Functional Description
The FDMF6707C is a driver-plus-FET module optimized
for the synchronous buck converter topology. A single
PWM input signal is all that is required to properly drive
the high-side and the low-side MOSFETs. Each part is
capable of driving speeds up to 1MHz.
VCIN and Disable (DISB#)
The VCIN pin is monitored by an under-voltage lockout
(UVLO) circuit. When VCIN rises above ~3.1V, the driver
is enabled. When VCIN falls below ~2.7V, the driver is
disabled (GH, GL=0). The driver can also be disabled by
pulling the DISB# pin LOW (DISB# < VIL_DISB), which
holds both GL and GH LOW regardless of the PWM
input state. The driver can be enabled by raising the
DISB# pin voltage HIGH (DISB# > VIH_DISB).
Table 1. UVLO and Disable Logic
UVLO
0
1
1
1
DISB#
X
0
1
Open
Driver State
Disabled (GH, GL=0)
Disabled (GH, GL=0)
Enabled (See Table 2)
Disabled (GH, GL=0)
Note:
3. DISB# internal pull-down current source is 10µA.
Thermal Warning Flag (THWN#)
The FDMF6707C provides a thermal warning flag
(THWN#) to advise of over-temperature conditions. The
thermal warning flag uses an open-drain output that
pulls to CGND when the activation temperature (150°C)
is reached. The THWN# output returns to high-
impedance state once the temperature falls to the reset
temperature (135°C). The THWN# output requires a
pull-up resistor, which can be connected to VCIN.
THWN# does NOT disable the DrMOS module.
THWN#
Logic
State
HIGH
135°C Reset
Temperature
150°C
Activation
Temperature
Normal
Operation
Thermal
Warning
LOW
TJ_driver IC
Figure 24. THWN Operation
Three-State PWM Input
The FDMF6707C incorporates a three-state 5V PWM
input gate drive design. The three-state gate drive has
both logic HIGH level and LOW level, along with a
three-state shutdown window. When the PWM input
signal enters and remains within the three -state window
for a defined hold-off time (tD_HOLD-OFF), both GL and GH
are pulled LOW. This feature enables the gate drive to
shut down both high-and low-side MOSFETs to support
features such as phase shedding, a common feature on
multi-phase voltage regulators.
Exiting Three-State Condition
When exiting a valid three-state condition, the
FDMF6707C design follows the PWM input command. If
the PWM input goes from three-state to LOW, the low-
side MOSFET is turned on. If the PWM input goes from
three-state to HIGH, the high-side MOSFET is turned
on, as illustrated in Figure 25. The FDMF6707C design
allows for short propagation delays when exiting the
three-state window (see Electrical Characteristics).
Low-Side Driver
The low-side driver (GL) is designed to drive a ground-
referenced low RDS(ON) N-channel MOSFET. The bias
for GL is internally connected between VDRV and
CGND. When the driver is enabled, the driver's output is
180° out of phase with the PWM input. When the driver
is disabled (DISB#=0V), GL is held LOW.
High-Side Driver
The high-side driver is designed to drive a floating
N-channel MOSFET. The bias voltage for the high-side
driver is developed by a bootstrap supply circuit
consisting of the internal Schottky diode and external
bootstrap capacitor (CBOOT). During startup, VSWH is
held at PGND, allowing CBOOT to charge to VDRV
through the internal diode. When the PWM input goes
HIGH, GH begins to charge the gate of the high-side
MOSFET (Q1). During this transition, the charge is
removed from CBOOT and delivered to the gate of Q1.
As Q1 turns on, VSWH rises to VIN, forcing the BOOT
pin to VIN + VBOOT, which provides sufficient VGS
enhancement for Q1. To complete the switching cycle,
Q1 is turned off by pulling GH to VSWH. CBOOT is then
recharged to VDRV when VSWH falls to PGND. GH
output is in-phase with the PWM input. The high-side
gate is held LOW when the driver is disabled or the
PWM signal is held within the three-state window for
longer than the three-state hold-off time, tD_HOLD-OFF.
© 2011 Fairchild Semiconductor Corporation
FDMF6707C • Rev. 1.0.1
11
www.fairchildsemi.com
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet FDMF6707C.PDF ] | |
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