FDMF6820B Fairchild Semiconductor, FDMF6820B Datasheet

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FDMF6820B

Manufacturer Part Number
FDMF6820B
Description
Manufacturer
Fairchild Semiconductor
Datasheet
© 2011 Fairchild Semiconductor Corporation
FDMF6820B • Rev. 1.0.2
FDMF6820B — Extra-Small, High-Performance,
High-Frequency DrMOS Module
Benefits
Features
Ordering Information
Part Number
FDMF6820B
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
Over 93% Peak-Efficiency
High-Current Handling: 55A
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
Clean Voltage Waveforms and Reduced Ringing
Fairchild SyncFET™ (Integrated Schottky Diode)
Technology in 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
Current Rating
®
4.0 DrMOS Standard
55A
®
Technology MOSFETs for
40-Lead, Clipbond PQFN DrMOS, 6.0mm x 6.0mm Package
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
FDMF6820B
MOSFETs, and a bootstrap Schottky diode into a
thermally enhanced, ultra-compact 6x6mm package.
With an integrated approach, the complete switching
power stage is optimized with regard to driver and
MOSFET dynamic performance, system inductance,
and power MOSFET R
Fairchild's high-performance PowerTrench
technology, which dramatically reduces switch ringing,
eliminating the need for snubber circuit in most buck
converter applications.
A driver IC with reduced dead times and propagation
delays further enhances the performance. A thermal
warning function warns of a potential over-temperature
situation. The FDMF6820B also incorporates a Skip
Mode (SMOD#) for improved light-load efficiency. The
FDMF6820B also provides a 3-state 3.3V PWM input for
compatibility with a wide range of PWM controllers.
Applications
Package
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 Converters
Networking and Telecom Microprocessor Voltage
Regulators
Small Form-Factor Voltage Regulator Modules
integrates
DS(ON)
a
driver
. XS™ DrMOS uses
IC,
April 2012
www.fairchildsemi.com
FDMF6820B
two
®
Top Mark
MOSFET
power

Related parts for FDMF6820B

FDMF6820B Summary of contents

Page 1

... A thermal warning function warns of a potential over-temperature situation. The FDMF6820B also incorporates a Skip Mode (SMOD#) for improved light-load efficiency. The FDMF6820B also provides a 3-state 3.3V PWM input for compatibility with a wide range of PWM controllers. Applications  High-Performance Gaming Motherboards  ...

Page 2

... UVLO DISB# 10µA V CIN R UP_PWM Input PWM 3- State Logic R DN_PWM THWN# Temp. Sense CGND © 2011 Fairchild Semiconductor Corporation FDMF6820B • Rev. 1.0.2 VDRV VCIN VIN R BOOT DISB# BOOT PWM FDMF6820B PHASE SMOD# VSWH THWN# PGND CGND Figure 1. Typical Application Circuit VDRV ...

Page 3

... LOW). This pin has a 10µA internal pull-down current source. Do not add a noise filter capacitor. 40 PWM PWM signal input. This pin accepts a three-state 3.3V PWM signal from the controller. © 2011 Fairchild Semiconductor Corporation FDMF6820B • Rev. 1.0.2 Figure 4. Top View Description 3 www.fairchildsemi.com ...

Page 4

... MOSFET switching transients. For reliable DrMOS operation, VSWH-to-GND and BOOT-to-GND must remain at or below the Absolute Maximum Ratings shown in the table above. Refer to the “Application Information” and “PCB Layout Guidelines” sections of this datasheet for additional information. © 2011 Fairchild Semiconductor Corporation FDMF6820B • Rev. 1.0.2 Parameter Referenced to CGND Referenced to CGND ...

Page 5

... High-Level Input Voltage IH_SMOD V Low-Level Input Voltage IL_SMOD I Pull-Up Current PLU t Propagation Delay PD_SLGLL t Propagation Delay PD_SHGLH © 2011 Fairchild Semiconductor Corporation FDMF6820B • Rev. 1.0 5V, and +25°C unless otherwise noted. CIN DRV A J Condition PWM=LOW or HIGH or Float Q VCIN ...

Page 6

... PD_PHGLL Delay Exiting 3-State Propagation t PD_TSGLH Delay Boot Diode V Forward-Voltage Drop F V Breakdown Voltage R © 2011 Fairchild Semiconductor Corporation FDMF6820B • Rev. 1.0 5V, and +25°C unless otherwise noted. CIN DRV A J Condition I =5mA PLD SW=0V, Delay Between GH from HIGH to LOW and GL from LOW to HIGH = 30A +25° ...

Page 7

... V IH_PWM PWM VSWH VSWH t PD_PHGLL t D_DEADON © 2011 Fairchild Semiconductor Corporation FDMF6820B • Rev. 1.0.2 90% 1.0V 10 PLGHL Figure 5. PWM Timing Diagram 7 V IL_PWM 10% 90% 1.2V t D_TIMEOUT ( 250ns Timeout) 2.2V t D_DEADOFF www.fairchildsemi.com ...

Page 8

... Module Switching Frequency, F Figure 8. Power Loss vs. Switching Frequency 1. 12V 1V 300kHz OUT SW 1.10 1.05 1.00 0.95 0.90 4.0 4.5 Driver Supply Voltage, V Figure 10. Power Loss vs. Driver Supply Voltage © 2011 Fairchild Semiconductor Corporation FDMF6820B • Rev. 1.0.2 =1V, V =5V, V =5V, L =250nH, T CIN DRV OUT 1000kHz ...

Page 9

... Driver Supply Voltage, V Figure 14. Driver Supply Current vs. Driver Supply Voltage 3.2 3.1 3.0 2.9 2.8 2.7 2.6 - Driver IC Junction Temperature, T Figure 16. UVLO Threshold vs. Temperature © 2011 Fairchild Semiconductor Corporation FDMF6820B • Rev. 1.0.2 =1V, V =5V, V =5V, L =250nH, T CIN DRV OUT 60 = 300kHz 1V 30A SW OUT OUT 100 ...

Page 10

... Driver IC Junction Temperature, T Figure 20. SMOD# Threshold vs. Temperature 2 25°C A 2.0 1.8 1.6 1.4 1.2 4.50 4.75 5.00 Driver IC Supply Voltage, V Figure 22. DISB# Threshold vs. Driver Supply Voltage © 2011 Fairchild Semiconductor Corporation FDMF6820B • Rev. 1.0.2 =5V, T =25°C, and natural convection cooling, unless otherwise specified. A 2.2 2.0 V IH_PWM 1.8 V TRI_HI V HIZ_PWM 1.6 V TRI_LO 1.4 V IL_PWM 1.2 ...

Page 11

... DRV 12 CIN 11.5 11.0 10.5 10.0 9.5 9.0 - Driver IC Junction Temperature, T Figure 24. DISB# Pull-Down Current vs. Temperature © 2011 Fairchild Semiconductor Corporation FDMF6820B • Rev. 1.0.2 =5V, T =25°C, and natural convection cooling, unless otherwise specified. A 500 450 400 350 300 250 200 150 100 55 100 125 150 ( o ...

Page 12

... PWM input goes from three-state to LOW, the low-side MOSFET is turned on. If the PWM input goes from Driver State three-state to HIGH, the high-side MOSFET is turned on. This is illustrated in Figure 27. The FDMF6820B design allows for short propagation delays when exiting the three-state window (see Electrical Characteristics). Low-Side Driver ...

Page 13

... PD_SHGLH GS IH_SMOD © 2011 Fairchild Semiconductor Corporation FDMF6820B • Rev. 1.0.2 HIGH, Q2 begins to turn off after a propagation delay (t PD_PHGLL Q1 begins to turn on after adaptive delay t To preclude overlap during the HIGH-to-LOW transition (Q1 off to Q2 on), the adaptive circuitry monitors the voltage at the GH-to-PHASE pin pair ...

Page 14

... D_DEADOFF D_DEADON © 2011 Fairchild Semiconductor Corporation FDMF6820B • Rev. 1.0.2 When the SMOD# pin is pulled HIGH, the synchronous buck converter works in Synchronous Mode. This mode allows for gating on the Low Side MOSFET. When the SMOD# pin is pulled LOW, the low-side MOSFET is gated off ...

Page 15

... ON Open - Drain Output © 2011 Fairchild Semiconductor Corporation FDMF6820B • Rev. 1.0.2 VCIN Filter The VDRV pin provides power to the gate drive of the high-side and low-side power MOSFET. In most cases, it can be connected directly to VCIN, the pin that provides power to the logic section of the driver. For additional noise immunity filter can be inserted between the VDRV and VCIN pins ...

Page 16

... MOSFET, balance using the largest area possible to improve DrMOS cooling while maintaining acceptable noise emission output inductor should be located close to the FDMF6820B to minimize the power loss due to the V copper trace. Care should also be taken so the SWH inductor dissipation does not heat the DrMOS. ® ...

Page 17

... Fairchild Semiconductor Corporation FDMF6820B • Rev. 1.0.2 Figure 31. PCB Layout Example (Top View) Figure 32. PCB Layout Example (Bottom View) 17 www.fairchildsemi.com ...

Page 18

... Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. © 2011 Fairchild Semiconductor Corporation FDMF6820B • Rev. 1.0.2 B PIN#1 INDICATOR 6. ...

Page 19

... Fairchild Semiconductor Corporation FDMF6820B • Rev. 1.0.2 19 www.fairchildsemi.com ...

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