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PDF FDMF6707B Data sheet ( Hoja de datos )
| Número de pieza | FDMF6707B | |
| Descripción | High-Frequency DrMOS Module | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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March 2012
FDMF6707B - 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 3.3V 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 Compliant
Based on the Intel® 4.0 DrMOS Standard
Description
The XS™ DrMOS family is Fairchild’s next-generation,
fully optimized, ultra-compact, integrated MOSFET plus
driver power stage solution for high-current, high-
frequency, synchronous buck DC-DC applications. The
FDMF6707B 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 warns of potential over-
temperature situations. FDMF6707B also incorporates
features such as Skip Mode (SMOD) for improved light-
load efficiency, along with a 3-state 3.3V 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
FDMF6707B
Current Rating
50A
Package
Top Mark
40-Lead, Clipbond PQFN DrMOS, 6.0mm x 6.0mm Package FDMF6707B
© 2011 Fairchild Semiconductor Corporation
FDMF6707B • Rev. 1.0.2
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
RDN_PWM
VIH_PWM
VTRI_HI
VTRI_LO
VIL_PWM
tD_HOLD-OFF
VHiZ_PWM
Pull-Up Impedance
Pull-Down Impedance
PWM High Level Voltage
3-State Upper Threshold
3-State Lower Threshold
PWM Low Level Voltage
3-State Shutoff Time
3-State Open Voltage
PWM Input (VCIN = VDRV = 5V ±5%)
RUP_PWM
RDN_PWM
VIH_PWM
VTRI_HI
VTRI_LO
VIL_PWM
tD_HOLD-OFF
VHiZ_PWM
Pull-Up Impedance
Pull-Down Impedance
PWM High Level Voltage
3-State Upper Threshold
3-State Lower Threshold
PWM Low Level Voltage
3-State Shutoff Time
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
26
12
1.88 2.25 2.61
1.84 2.20 2.56
0.70 0.95 1.19
0.62 0.85 1.13
160 200
1.40 1.60 1.90
kΩ
kΩ
V
V
V
V
ns
V
26
12
2.00 2.25 2.50
1.94 2.20 2.46
0.75 0.95 1.15
0.66 0.85 1.09
160 200
1.45 1.60 1.80
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
FDMF6707B • Rev. 1.0.2
5
www.fairchildsemi.com
Free Datasheet http://www.datasheet4u.com/
5 Page 
Functional Description
The FDMF6707B 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 for operation. 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 FDMF6707B 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). For use, 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
3-State PWM Input
The FDMF6707B incorporates a 3-state 3.3V PWM
input gate drive design. The 3-state gate drive has both
logic HIGH level and LOW level, along with a 3-state
shutdown window. When the PWM input signal enters
and remains within the 3-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 3-State Condition
When exiting a valid 3-state condition, the FDMF6707B
design follows the PWM input command. If the PWM
input goes from 3-state to LOW, the low-side MOSFET
is turned on. If the PWM input goes from 3-state to
HIGH, the high-side MOSFET is turned on, as illustrated
in Figure 25. The FDMF6707B design allows for short
propagation delays when exiting the 3-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 3-state window for
longer than the 3-state hold-off time, tD_HOLD-OFF.
© 2011 Fairchild Semiconductor Corporation
FDMF6707B • Rev. 1.0.2
11
www.fairchildsemi.com
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet FDMF6707B.PDF ] | |
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