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LTC1623IS8 Datasheet(PDF) 9 Page - Linear Technology

Part # LTC1623IS8
Description  SMBus Dual High Side Switch Controller
Download  12 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1623IS8 Datasheet(HTML) 9 Page - Linear Technology

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9
LTC1623
APPLICATIONS INFORMATION
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
µF
capacitor to create enough RC delay (10k • 0.1
µF = 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
µF capacitor and the gate of the MOSFET
(Figure 3) is required to eliminate possible MOSFET self
oscillations.
GA
GB
LTC1623
GND
VCC
3.5V TO 5.5V
VCC
0.1
µF
1k
13
8
680
56
3.3k
VOUT
3.3V
10k
10
µF
CLK
DATA
(PROGRAMMABLE)
(FROM SMBus)
AD0
AD1
510pF
LOAD
Si3442DV
Si3442DV
LT1431
1623 F04
470
µF
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
VCC
2.7V TO 5.5V
10
µF
(PROGRAMMABLE)
FAN
DISPLAY
1623 F03
(FROM
SMBus)
LTC1623
GND
VCC
AD0
AD1
CLK
DATA
GA
GB
0.1
µF
Q1
Si3442DV
Q2
Si6433DQ
0.1
µF
1k
1k
Figure 6. Switching Regulator with Low-Battery
Detect Using 22
µA Standby Current
VCC
2.7V TO 4.5V
0.1
µF
100
µF
1k
3
8
4
2
499k
5
7
LBO
22
µH*
*SUMIDA CD54-220
604k
10
µF
(PROGRAMMABLE)
(FROM
SMBus)
1N5817
LOAD
SHDN
Si3442DV
Si3442DV
LT1304-5
1623 F05
+
2200
µF
5V
200mA
100k
+
GA
GB
LTC1623
GND
VCC
CLK
DATA
AD0
AD1
GA
GB
LTC1623
GND
VCC
3.5V TO 5.5V
VCC
13
8
680
56
3.3k
VOUT
3.3V
SWITCHED
VOUT
3.3V
10k
10
µF
CLK
DATA
(PROGRAMMABLE)
(FROM SMBus)
AD0
AD1
510pF
0.1
µF
Si3442DV
LT1431
1623 TA03
1k
470
µF
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
µA (Figure 6).


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