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參數(shù)資料
| 型號(hào)： | LTC1645CS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Low Power Timer 8-SOIC 0 to 70 |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14 |
| 封裝： | 0.150 INCH, PLASTIC, SO-14 |
| 文件頁(yè)數(shù)： | 21/24頁(yè) |
| 文件大?。?/td> | 312K |
| 代理商： | LTC1645CS |
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21
LTC1645
Table 1. N-Channel Selection Guide
CURRENT
LEVEL
NUMBER
1A to 2A
NDH8503N
PART
MANUFACTURER
Fairchild
DESCRIPTION
Dual N-Channel
R
DS(ON)
= 0.033
SuperSOT-8
1A to 2A
Si6928DQ
Siliconix
Dual N-Channel
R
DS(ON)
= 0.035
TSSOP-8
Dual N-Channel
R
DS(ON)
= 0.025
SO-8
Dual N-Channel
R
DS(ON)
= 0.029
SuperSOT-8
Single N-Channel
R
DS(ON)
= 0.009
SO-8
Single N-Channel
R
DS(ON)
= 0.01
SO-8
Single N-Channel
R
DS(ON)
= 0.011
SO-8
Single N-Channel
R
DS(ON)
= 0.0125
SO-8
Single N-Channel
R
DS(ON)
= 0.0035
TO-263AB
Single N-Channel
R
DS(ON)
= 0.004
D
2
PAK
2A to 5A
Si4920DY
Siliconix
2A to 5A
IRF7313
International
Rectifier
5A to 10A
Si4420
Siliconix
5A to 10A
FDS6680
Fairchild
5A to 10A
IRF7413
International
Rectifier
5A to 10A
MMSF3300
ON Semiconductor
10A to 20A
FDB8030L
Fairchild
10A to 20A
SUD75N03-04
Siliconix
ON
2V/DIV
V
2V/DIV
V
2V/DIV
Figure 24. Switching Regulator Hot Swap
V
2V/DIV
V
2V/DIV
RESET
5V/DIV
APPLICATIOU
W
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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