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PD - 95868
IRF8910
HEXFET(R) Power MOSFET
Applications l Dual SO-8 MOSFET for POL converters in desktop, servers, graphics cards, game consoles and set-top box Benefits l Very Low RDS(on) at 4.5V VGS l Ultra-Low Gate Impedance l Fully Characterized Avalanche Voltage and Current l 20V VGS Max. Gate Rating
VDSS
20V
RDS(on) max
13.4m:@VGS = 10V
ID
10A
S1 G1 S2 G2
1 2 3 4
8 7 6 5
D1 D1 D2 D2
Top View
SO-8
Absolute Maximum Ratings
Parameter
VDS VGS ID @ TA = 25C ID @ TA = 70C IDM PD @TA = 25C PD @TA = 70C TJ TSTG Drain-to-Source Voltage Gate-to-Source Voltage Continuous Drain Current, VGS @ 10V Continuous Drain Current, VGS @ 10V Pulsed Drain Current Power Dissipation Power Dissipation Linear Derating Factor Operating Junction and Storage Temperature Range
Max.
20 20 10 8.3 82 2.0 1.3 0.016 -55 to + 150
Units
V
c
A W W/C C
Thermal Resistance
Parameter
RJL RJA Junction-to-Drain Lead Junction-to-Ambient
Typ.
--- ---
Max.
20 62.5
Units
C/W
fg
Notes through are on page 10
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1
4/28/04
IRF8910
Static @ TJ = 25C (unless otherwise specified)
Parameter
BVDSS VDSS/TJ RDS(on) VGS(th) VGS(th)/TJ IDSS IGSS gfs Qg Qgs1 Qgs2 Qgd Qgodr Qsw Qoss td(on) tr td(off) tf Ciss Coss Crss Drain-to-Source Breakdown Voltage Breakdown Voltage Temp. Coefficient Static Drain-to-Source On-Resistance Gate Threshold Voltage Gate Threshold Voltage Coefficient Drain-to-Source Leakage Current Gate-to-Source Forward Leakage Gate-to-Source Reverse Leakage Forward Transconductance Total Gate Charge Pre-Vth Gate-to-Source Charge Post-Vth Gate-to-Source Charge Gate-to-Drain Charge Gate Charge Overdrive Switch Charge (Qgs2 + Qgd) Output Charge Turn-On Delay Time Rise Time Turn-Off Delay Time Fall Time Input Capacitance Output Capacitance Reverse Transfer Capacitance Parameter Single Pulse Avalanche Energy Avalanche Current
Min. Typ. Max. Units
20 --- --- --- 1.65 --- --- --- --- --- 24 --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- 0.015 10.7 14.6 --- -4.8 --- --- --- --- --- 7.4 2.4 0.80 2.5 1.7 3.3 4.4 6.2 10 9.7 4.1 960 300 160 --- --- 13.4 18.3 2.55 --- 1.0 150 100 -100 --- 11 --- --- --- --- --- --- --- --- --- --- --- --- --- Typ. --- --- pF nC ns nC V
Conditions
VGS = 0V, ID = 250A
V/C Reference to 25C, ID = 1mA m VGS = 10V, ID = 10A V VGS = 4.5V, ID = 8.0A VDS = VGS, ID = 250A
e e
mV/C A VDS = 16V, VGS = 0V nA S VDS = 16V, VGS = 0V, TJ = 125C VGS = 20V VGS = -20V VDS = 10V, ID = 8.2A VDS = 10V VGS = 4.5V ID = 8.2A See Fig. 6 VDS = 10V, VGS = 0V VDD = 10V, VGS = 4.5V ID = 8.2A Clamped Inductive Load VGS = 0V VDS = 10V = 1.0MHz Max. 19 8.2 Units mJ A
Avalanche Characteristics
EAS IAR
d
Diode Characteristics
Parameter
IS ISM VSD trr Qrr Continuous Source Current (Body Diode) Pulsed Source Current (Body Diode)A Diode Forward Voltage Reverse Recovery Time Reverse Recovery Charge
Min. Typ. Max. Units
--- --- --- --- --- --- --- --- 17 6.5 2.5 A 82 1.0 26 9.7 V ns nC
Conditions
MOSFET symbol showing the integral reverse
G D
S p-n junction diode. TJ = 25C, IS = 8.2A, VGS = 0V TJ = 25C, IF = 8.2A, VDD = 10V di/dt = 100A/s
e
e
2
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IRF8910
100
TOP VGS 10V 8.0V 5.5V 4.5V 3.5V 3.0V 2.8V 2.5V
100
TOP VGS 10V 8.0V 5.5V 4.5V 3.5V 3.0V 2.8V 2.5V
ID, Drain-to-Source Current (A)
10
BOTTOM
ID, Drain-to-Source Current (A)
BOTTOM
1
10
2.5V 0.1
60s PULSE WIDTH
0.01 0.1 1 Tj = 25C 1 100 0.1 10
2.5V
60s PULSE WIDTH
Tj = 150C 10 100
1
V DS, Drain-to-Source Voltage (V)
V DS, Drain-to-Source Voltage (V)
Fig 1. Typical Output Characteristics
Fig 2. Typical Output Characteristics
100
1.5
10 T J = 150C 1 T J = 25C
RDS(on) , Drain-to-Source On Resistance (Normalized)
ID, Drain-to-Source Current ()
ID = 10A VGS = 10V
1.0
0.1 1 2 3
VDS = 10V 60s PULSE WIDTH 4 5 6
0.5 -60 -40 -20 0 20 40 60 80 100 120 140 160
VGS, Gate-to-Source Voltage (V)
T J , Junction Temperature (C)
Fig 3. Typical Transfer Characteristics
Fig 4. Normalized On-Resistance vs. Temperature
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IRF8910
10000 VGS = 0V, f = 1 MHZ C iss = C gs + C gd, C ds SHORTED C rss = C gd C oss = C ds + C gd
6.0 ID= 8.2A
VGS, Gate-to-Source Voltage (V)
5.0 4.0 3.0 2.0 1.0 0.0
VDS= 16V VDS= 10V
C, Capacitance(pF)
1000
Ciss
Coss
Crss
100 1 10 100
0
1
2
3
4
5
6
7
8
9
10
VDS, Drain-to-Source Voltage (V)
QG Total Gate Charge (nC)
Fig 5. Typical Capacitance vs. Drain-to-Source Voltage
Fig 6. Typical Gate Charge Vs. Gate-to-Source Voltage
100.00
1000 OPERATION IN THIS AREA LIMITED BY R DS(on)
10.00
T J = 150C
1.00
ID, Drain-to-Source Current (A)
ISD, Reverse Drain Current (A)
100
10
100sec 1msec
0.10
T J = 25C
1
0.01 0.2 0.4 0.6 0.8 1.0
VGS = 0V
T A = 25C Tj = 150C Single Pulse 0 1 10
10msec
0.1
1.2 1.4 1.6
100
VSD, Source-to-Drain Voltage (V)
VDS, Drain-to-Source Voltage (V)
Fig 7. Typical Source-Drain Diode Forward Voltage
Fig 8. Maximum Safe Operating Area
4
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IRF8910
10
VGS(th) Gate threshold Voltage (V)
2.5
9 8
ID, Drain Current (A)
7 6 5 4 3 2 1 0 25 50 75 100 125 150 T A , Ambient Temperature (C)
2.0
ID = 250A
1.5
1.0 -75 -50 -25 0 25 50 75 100 125 150
T J , Temperature ( C )
Fig 9. Maximum Drain Current vs. Ambient Temperature
Fig 10. Threshold Voltage vs. Temperature
100
D = 0.50
Thermal Response ( Z thJA )
10
0.20 0.10 0.05
1
0.02 0.01
J J 1 1
R1 R1 2
R2 R2
R3 R3 3
R4 R4 4
R5 R5 5
Ri (C/W)
1.2647
C C
i (sec)
0.000091 0.000776 0.188739 0.757700
2.0415 18.970 23.415 16.803
2
3
4
5
0.1
SINGLE PULSE ( THERMAL RESPONSE )
Ci= i/Ri Ci= i/Ri
25.10000 Notes: 1. Duty Factor D = t1/t2 2. Peak Tj = P dm x Zthja + Tc
0.1 1 10 100
0.01 1E-006 1E-005 0.0001 0.001 0.01
t1 , Rectangular Pulse Duration (sec)
Fig 11. Maximum Effective Transient Thermal Impedance, Junction-to-Ambient
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IRF8910
RDS(on) , Drain-to -Source On Resistance (m)
40.00
80
EAS , Single Pulse Avalanche Energy (mJ)
ID = 10A 30.00
70 60 50 40 30 20 10 0
ID TOP 3.4A 4.9A BOTTOM 8.2A
20.00
T J = 125C
10.00
T J = 25C
0.00 3 4 5 6 7 8 9 10
25
50
75
100
125
150
VGS, Gate -to -Source Voltage (V)
Starting T J , Junction Temperature (C)
Fig 12. On-Resistance vs. Gate Voltage
Fig 13. Maximum Avalanche Energy vs. Drain Current
Current Regulator Same Type as D.U.T.
V(BR)DSS
15V
tp
12V .2F
DRIVER
50K .3F
VDS
L
D.U.T.
RG
20V VGS
+ V - DS
D.U.T
IAS tp
+ - VDD
A
VGS
0.01
I AS
3mA
Fig 14. Unclamped Inductive Test Circuit and Waveform
LD VDS
IG
ID
Current Sampling Resistors
Fig 15. Gate Charge Test Circuit
+
V DD -
90%
VDS
D.U.T VGS Pulse Width < 1s Duty Factor < 0.1%
10%
VGS
td(on) tr td(off) tf
Fig 16. Switching Time Test Circuit
Fig 17. Switching Time Waveforms
6
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IRF8910
D.U.T
Driver Gate Drive
+
P.W.
Period
D=
P.W. Period VGS=10V
+
Circuit Layout Considerations * Low Stray Inductance * Ground Plane * Low Leakage Inductance Current Transformer
*
D.U.T. ISD Waveform Reverse Recovery Current Body Diode Forward Current di/dt D.U.T. VDS Waveform Diode Recovery dv/dt
-
-
+
RG
* * * * dv/dt controlled by RG Driver same type as D.U.T. I SD controlled by Duty Factor "D" D.U.T. - Device Under Test
V DD
VDD
+ -
Re-Applied Voltage Inductor Curent
Body Diode
Forward Drop
Ripple 5%
ISD
* VGS = 5V for Logic Level Devices Fig 15. Peak Diode Recovery dv/dt Test Circuit for N-Channel HEXFET(R) Power MOSFETs
Id Vds Vgs
Vgs(th)
Qgs1 Qgs2
Qgd
Qgodr
Fig 16. Gate Charge Waveform
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IRF8910
Power MOSFET Selection for Non-Isolated DC/DC Converters
Control FET Special attention has been given to the power losses in the switching elements of the circuit - Q1 and Q2. Power losses in the high side switch Q1, also called the Control FET, are impacted by the Rds(on) of the MOSFET, but these conduction losses are only about one half of the total losses. Power losses in the control switch Q1 are given by; Synchronous FET The power loss equation for Q2 is approximated by;
* Ploss = Pconduction + P + Poutput drive
Ploss = Irms x Rds(on)
+ ( g x Vg x f ) Q
(
2
)
Ploss = Pconduction+ Pswitching+ Pdrive+ Poutput
This can be expanded and approximated by;
Q + oss x Vin x f + (Qrr x Vin x f ) 2
*dissipated primarily in Q1. For the synchronous MOSFET Q2, Rds(on) is an important characteristic; however, once again the importance of gate charge must not be overlooked since it impacts three critical areas. Under light load the MOSFET must still be turned on and off by the control IC so the gate drive losses become much more significant. Secondly, the output charge Qoss and reverse recovery charge Qrr both generate losses that are transfered to Q1 and increase the dissipation in that device. Thirdly, gate charge will impact the MOSFETs' susceptibility to Cdv/dt turn on. The drain of Q2 is connected to the switching node of the converter and therefore sees transitions between ground and Vin. As Q1 turns on and off there is a rate of change of drain voltage dV/dt which is capacitively coupled to the gate of Q2 and can induce a voltage spike on the gate that is sufficient to turn the MOSFET on, resulting in shoot-through current . The ratio of Qgd/Qgs1 must be minimized to reduce the potential for Cdv/dt turn on.
Ploss = (Irms 2 x Rds(on ) ) Qgs 2 Qgd +I x x Vin x f + I x x Vin x f ig ig + (Qg x Vg x f ) + Qoss x Vin x f 2
This simplified loss equation includes the terms Qgs2 and Qoss which are new to Power MOSFET data sheets. Qgs2 is a sub element of traditional gate-source charge that is included in all MOSFET data sheets. The importance of splitting this gate-source charge into two sub elements, Qgs1 and Qgs2, can be seen from Fig 16. Qgs2 indicates the charge that must be supplied by the gate driver between the time that the threshold voltage has been reached and the time the drain current rises to Idmax at which time the drain voltage begins to change. Minimizing Qgs2 is a critical factor in reducing switching losses in Q1. Qoss is the charge that must be supplied to the output capacitance of the MOSFET during every switching cycle. Figure A shows how Qoss is formed by the parallel combination of the voltage dependant (nonlinear) capacitances Cds and Cdg when multiplied by the power supply input buss voltage.
8
Figure A: Qoss Characteristic
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IRF8910
SO-8 Package Details
Dimensions are shown in millimeters (inches)
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IRF8910
SO-8 Tape and Reel
Dimensions are shown in millimeters (inches)
TERMINAL NUMBER 1
12.3 ( .484 ) 11.7 ( .461 )
8.1 ( .318 ) 7.9 ( .312 )
FEED DIRECTION
NOTES: 1. CONTROLLING DIMENSION : MILLIMETER. 2. ALL DIMENSIONS ARE SHOWN IN MILLIMETERS(INCHES). 3. OUTLINE CONFORMS TO EIA-481 & EIA-541.
330.00 (12.992) MAX.
14.40 ( .566 ) 12.40 ( .488 ) NOTES : 1. CONTROLLING DIMENSION : MILLIMETER. 2. OUTLINE CONFORMS TO EIA-481 & EIA-541.
Notes: Repetitive rating; pulse width limited by max. junction temperature. Starting TJ = 25C, L = 0.57mH, RG = 25, IAS = 8.2A. Pulse width 400s; duty cycle 2%. When mounted on 1 inch square copper board. R is measured at TJ of approximately 90C.
Data and specifications subject to change without notice. This product has been designed and qualified for the Industrial market. Qualification Standards can be found on IR's Web site.
IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 TAC Fax: (310) 252-7903 Visit us at www.irf.com for sales contact information. 04/04
10
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