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参数资料
| 型号： | LTC1422IS8#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | Hot Swap Controller; Package: SO; No of Pins: 8; Temperature Range: -40°C to +85°C |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | 0.150 INCH, PLASTIC, SO-8 |
| 文件页数： | 2/16页 |
| 文件大小： | 193K |
| 代理商： | LTC1422IS8#PBF |
10
LTC1422
1422fb
1
2
3
4
8
7
6
5
VCC
SENSE
GATE
FB
RESET
ON
TIMER
GND
LTC1422
1422 F10
D1
1N4148
Q1
1/2 Si9436
Q2
1/2 Si99436
R2
0.01
5%
R3
10
5%
C1
0.33
F
16V
R1
10k
5%
RESET
ON
R6
1M
5%
R7
10
5%
R4
2.74k
1%
TRIP POINT: 4.6V
R5
1k
1%
C3
0.047
F
25V
C2
0.022
F
25V
CLOAD
VOUT
3.3V
VOUT
5V
VIN
3.3V
VIN
5V
5V OUT
3.3V OUT
CURRENT LIMIT: 5A
+
Figure 10. Switching 5V and 3.3V
+
SENSE
R4
R3
R2
7
VCC
VOUT
VCC
8
10k
GATE
LTC1422
6
2
REF
FB
1422 F09
1
5
C2
Q2: 2N7002LT1
Q3, Q4: MMBT3904LT1
Q2
ON/RESET
3
TIMER
ON
4
RESET
C1
CLOAD
Q1
R1
LOGIC
–
+
COMP 5
10k
Q3
Q4
CONNECTOR
1
CONNECTOR
2
Figure 9. ON Pin Circuitry
and C3 are used to set the rise and fall delays on the 5V
supply. Next, the 3.3V supply ramps up with a 20ms delay
set by R6 and C2. On the falling edge, the 3.3V supply
ramps down first because R6 is bypassed by the diode D1.
Using the LTC1422 as a Linear Regulator
The LTC1422 can be used to Hot Swap the primary supply
and generate a secondary low dropout regulated supply.
Figure 11 shows how to switch a 5V supply and create a
3.3V supply using the reset comparator and one addi-
tional transistor. The FB pin is used to monitor the 3.3V
output. When the voltage on the gate of Q2 increases, the
3.3V increases. At the 3.3V threshold, the reset compara-
tor will trip. The RESET pin goes high which turns on Q3.
This lowers the voltage on the gate of Q2. This feedback
loop is compensated by the capacitor C1 and the resistors
R6 and R7.
Hot Swapping 48V DC/DC Module with
Active Low On/Off Control Signal
Using a 7.5V Zener and a resistor, the LTC1422 can switch
supplies much greater than the 12V VCC pin rating. As
shown in Figure 12, the switching FET Q1 is connected as
a common source driver rather than the usual source
follower used in previous applications. This allows the
ground of the LTC1422 to sit at the negative terminal of the
48V input. The clamp circuit of R5 and D1 provides power
to the LTC1422. The resistive divider R1 and R2 at the ON
pin monitors the input supply. The switching FET Q1 is
prevented from turning on until the input supply is at least
38V. Using the reset comparator to monitor the gate
voltage allows the module to be turned on after the gate
has reached a minimum level plus one timing cycle. A high
voltage transistor Q2 is used to translate the RESET signal
to the module On/Off input.
APPLICATIONS INFORMATION
WU
U
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