RC5050 Datasheet, PDF (11/20 Pages) List of Unclassifed Manufacturers – Programmable DC-DC Converter for Lo Voltage

PRODUCT SPECIFICATION
RC5050
Table 4. MOSFET Selection Table
Manufacturer & Model #
Fuji
2SK1388
Siliconix
SI4410DY
National Semiconductor
NDP706AL
NDP706AEL
National Semiconductor
NDP603AL
National Semiconductor
NDP606AL
Motorola
MTB75N03HDL
Int. Rectifier
IRLZ44
Int. Rectifier
IRL3103S
Conditions¹
VGS=4V, ID=17.5A TJ =25°C
TJ =125°C
VGS=4.5V, ID=5A TJ =25°C
TJ =125°C
VGS=5V, ID=40A TJ =25°C
VGS=4.5V, ID=10A
VGS=5V, ID=24A
VGS=5V, ID=37.5A
VGS=5V, ID=31A
VGS=4.5V, ID=28A
TJ =125°C
TJ =25°C
TJ =125°C
TJ =25°C
TJ =125°C
TJ =25°C
TJ =125°C
TJ =25°C
TJ =125°C
TJ =25°C
TJ =125°C
RDS, ON (mΩ)
Typ. Max.
25
37
37
—
16.5
20
28
34
13
15
20
24
31
40
42
54
22
25
33
40
6
9
9.3
14
—
28
—
46
—
19
31
Package
TO-220
Thermal
Resistance
ΦJA=75
SO-8
(SMD)
TO-220
ΦJA=50
ΦJA=62.5
ΦJC=1.5
TO-220
TO-220
TO-263
(D² PAK)
TO-220
TO-220
ΦJA=62.5
ΦJC=2.5
ΦJA=62.5
ΦJC=1.5
ΦJA=62.5
ΦJC=1.0
ΦJA=62.5
ΦJC=1.0
ΦJA=62.5
ΦJC=1.0
Note:
1. RDS,ON values at Tj = 125°C for most devices were extrapolated from the typical operating curves supplied by the
manufacturers and are approximations only.
MOSFET Gate Bias
Figure 4 illustrates how an external 12V supply is used to
bias the output driver supply, VCCQP. A 47Ω resistor is
used to limit the transient current into the VCCQP pin and a
1µF capacitor filter is used to filter the VCCQP supply. This
method provides a sufficient gate-to-source bias voltage
(VGS ) to the MOSFET, and therefore reduces the RDS,ON
and the resulting power loss within the MOSFET. Figure 5
illustrates how the RDS,ON decreases dramatically as VGS
increases. A 6.2V Zener (D1) is used to clamp the voltage at
VCCQP to a maximum of 12V, thus ensuring that the abso-
lute maximum voltage limit of the IC will not be exceeded.
PWM/PFM
Control
+5V
47Ω
+12V
VCCQP
HIDRV
D1
6.2V
M1
1µF
L1 RS
VO
DS1
CB
65-5050-07
Figure 4. MOSFET Gate Bias Configuration
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