21
LTC1645
1645fa
Table 1. N-Channel Selection Guide
CURRENT
PART
LEVEL
NUMBER
MANUFACTURER DESCRIPTION
1A to 2A
NDH8503N
Fairchild
Dual N-Channel
R
DS(ON)
= 0.033
SuperSOT-8
1A to 2A
Si6928DQ
Vishay/Siliconix
Dual N-Channel
R
DS(ON)
= 0.035
TSSOP-8
2A to 5A
Si4920DY
Vishay/Siliconix
Dual N-Channel
R
DS(ON)
= 0.025
SO-8
2A to 5A
IRF7313
International
Dual N-Channel
Rectifier
R
DS(ON)
= 0.029
SuperSOT-8
5A to 10A
Si4420
Vishay/Siliconix
Single N-Channel
R
DS(ON)
= 0.009
SO-8
5A to 10A
FDS6680
Fairchild
Single N-Channel
R
DS(ON)
= 0.01
SO-8
5A to 10A
IRF7413
International
Single N-Channel
Rectifier
R
DS(ON)
= 0.011
SO-8
5A to 10A
MMSF3300
ON Semiconductor Single N-Channel
R
DS(ON)
= 0.0125
SO-8
10A to 20A
FDB8030L
Fairchild
Single N-Channel
R
DS(ON)
= 0.0035
TO-263AB
10A to 20A SUB75N03-04
Vishay/Siliconix
Single N-Channel
R
DS(ON)
= 0.004
D
2
PAK
ON
2V/DIV
V
OUT2
2V/DIV
V
REGOUT
2V/DIV
Figure 24. Switching Regulator Hot Swap
V
OUT1
2V/DIV
V
REGIN
2V/DIV
RESET
5V/DIV
APPLICATIO S I FOR ATIO
U
U
U
V
CC
V
OUT
*USER SELECTED VOLTAGE CLAMP
1N4688 (5V)
1N4692 (7V): LOGIC-LEVEL MOSFET
1N4695 (9V)
1N4702 (15V): STANDARD-LEVEL MOSFET
1645 F25
R1
D1*
D2
1N4148
D4*
D2
1N4148
Q1
Figure 25. Optional Gate Clamp
its FB or SENSE pin. In the case of the LTC1649, large peak
currents result if the FB pin is at ground and not connected
directly to the output inductor and capacitors. To keep the
peak currents under control, R1, R2 and D1 hold the FB pin
above ground but below its normal regulated value until
V
OUT2
ramps up and D1 reverse-biases.
Power N-Channel Selection
The R
DS(ON)
of the external pass transistors must be low
enough so that the voltage drop across them is 100mV or
less at full current. If the R
DS(ON)
is too high, the voltage
drop across the transistor can cause the output voltage to
trip the reset circuit. The transistors listed in Table 1 or
other similar transistors are recommended for use with
the LTC1645.
Low voltage applications may require the use of logic-level
FETs; ensure their maximum V
GS
rating is sufficient for the
application. GATE voltage as a function of V
CC
is illustrated
in the Typical Performance curves. If lower GATE drive is
desired, connect a diode in series with a zener between
GATE and V
CC
or between GATE and V
OUT
as shown in
Figure 25.
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