參數(shù)資料
型號(hào): LTC1623
廠(chǎng)商: Linear Technology Corporation
英文描述: SMBus Dual High Side Switch Controller(SMBus 雙高邊開(kāi)關(guān)穩(wěn)壓器)
中文描述: 的SMBus雙高邊開(kāi)關(guān)控制器(帶有SMBus雙高邊開(kāi)關(guān)穩(wěn)壓器)
文件頁(yè)數(shù): 9/12頁(yè)
文件大?。?/td> 113K
代理商: LTC1623
9
LTC 1623
APPLICATIO
S I
FOR
ATIO
U
W
U
U
To avoid turning on the external power MOSFETs too
quickly, an internal 10k resistor has been placed in series
with each of the output gate drive pins (see Functional
Block Diagram). Therefore, it only needs an external 0.1
μ
F
capacitor to create enough RC delay (10k
0.1
μ
F = 1ms)
to slow down the ramp rate of the output gate drive. In
other words, it will take a minimum of 1ms to charge up
the external MOSFET. An additional external 1k resistor
between the 0.1
μ
F capacitor and the gate of the MOSFET
(Figure 3) is required to eliminate possible MOSFET self
oscillations.
GA
GB
LTC1623
AD0
AD1
GND
V
3.5V TO 5.5V
V
CC
0.1
μ
F
1k
1
3
8
680
5
6
3.3k
V
3.3V
10k
10
μ
F
CLK
DATA
(PROGRAMMABLE)
(FROM SMBus)
510pF
LOAD
Si3442DV
Si3442DV
LT1431
1623 F04
470
μ
F
6V
+
Figure 4. 3.3V/3A Extremely Low Voltage Drop
Regulator and Load Switch
Figure 3. Dual Load Switch with Q2 On upon Power-Up
V
2.7V TO 5.5V
10
μ
F
(PROGRAMMABLE)
FAN
DISPLAY
1623 F03
(FROM
SMBus)
LTC1623
GND
V
CC
AD0
AD1
CLK
DATA
GA
GB
0.1
μ
F
Q1
Si3442DV
Q2
Si6433DQ
0.1
μ
F
1k
1k
Figure 6. Switching Regulator with Low-Battery
Detect Using 22
μ
A Standby Current
V
2.7V TO 4.5V
0.1
μ
F
100
μ
F
1k
3
8
4
2
499k
5
7
LBO
22
μ
H*
*SUMIDA CD54-220
604k
10
μ
F
(FROM
SMBus)
(PROGRAMMABLE)
1N5817
LOAD
SHDN
Si3442DV
Si3442DV
LT1304-5
1623 F05
+
2200
μ
F
5V
200mA
100k
+
GA
GB
LTC1623
GND
V
CC
CLK
DATA
AD0
AD1
GA
GB
LTC1623
AD0
AD1
GND
V
3.5V TO 5.5V
V
CC
1
3
8
680
5
6
3.3k
V
3.3V
SWITCHED
V
3.3V
10k
10
μ
F
CLK
DATA
(PROGRAMMABLE)
(FROM SMBus)
510pF
0.1
μ
F
Si3442DV
LT1431
1623 TA03
1k
470
μ
F
6V
Si3442DV
+
Figure 5. SMBus Controlled Low Dropout Regulator
For active-low applications in which the load needs to be
on upon power-up, an external P-channel switch can be
used (Figure 3). This load can be switched off later after the
proper protocol has been sent.
Used with the LT
1431, the LTC1623 makes a 3.3V/3A
extremely low voltage drop regulator (Figures 4 and 5). In
this application, the other output channel can be used to
drive a separate load, or it can also be used to control the
output of the LDO so that the user has total control over the
switching in and switching out of the LDO (Figure 5). Also,
with the help of the LT1304-5, the LTC1623 can be used
to make a boost switching regulator with a low standby
current of 22
μ
A (Figure 6).
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