參數(shù)資料
型號： LTC4222IUH#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： 2-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32
封裝： 5 X 5 MM, LEAD FREE, PLASTIC, MO-220WHHD-X, QFN-32
文件頁數(shù)： 6/32頁
文件大?。?/td> 280K
代理商： LTC4222IUH#PBF
LTC4222
14
4222fa
Figure 1. Typical Application
A MOSFET is turned on by charging up the GATE with a
12μA current source. When the GATE voltage reaches the
MOSFET threshold voltage, the MOSFET begins to turn on
and the SOURCE voltage then follows the GATE voltage
as it increases.
While the MOSFET is turning on, the inrush current in-
creases linearly at a dI/dt rate selected by capacitor CSS.
This is accomplished using the current limit amplier
controlling the GATE pin voltage. Once the inrush current
reaches the limit set by the FB pin, the dI/dt ramp stops and
the inrush current follows the foldback prole as shown
in Figure 2. When both channels turn on simultaneously,
the foldback current limit is set by the lower of the two
FB pins.
A start-up timer is used to prevent damaging the MOSFET
when starting up into a short-circuit. The TIMER capacitor
integrates at 100μA during start-up and once the TIMER
pin reaches threshold of 1.235V, the part checks to see if
it is in current limit. If this is the case, the overcurrent fault
bit, FAULT bit 2 in Table 6, is set and the part turns off. If
the part is not in current limit, the 50mV circuit breaker is
armed and the current limit is switched to 150mV. Alter-
nately an internal 100ms start-up timer may be selected
by tying the TIMER pin to INTVCC.
As the SOURCE voltage rises, the FB pin voltage follows as
set by R7 and R8. Once FB crosses its 1.235V threshold,
and the start-up timer has expired, the corresponding GPIO
pin, in the default power good conguration, ceases to
pull low and indicates that power is now good. Alternately
STATUS bit 3 can be read to check power-good status,
where a zero indicates that power is good.
If a series resistor and capacitor from GATE to GROUND
(R6 and C1) are employed to provide a constant inrush
current during start-up, which provides a constant dV/dt at
UV1 VDD1
LTC4222
GATE1
INTVCC
ADR2
ADR1
NC
ADR0
CONFIG
SOURCE1
UV2 VDD2
GATE2
SOURCE2
OV1
OV2
ALERT
SCL
SDA
ON
FB1
ADIN1
TIMER
GPIO1
EN1
SS
PLUG-IN
CARD
R5-1
10Ω
RG1
15k
CG1
3.9nF
CTIMER
0.68μF
CSS
68nF
RS1
0.01Ω
Q1
FDD3706
R71
10.2k
R81
3.57k
R41
100k
4222 TA01a
CF1
0.1μF
R11
140k
R21
4.53k
R31
13.7k
Z1
SA14A
BACKPLANE
GND
ALERT
SCL
ON
SDA
VIN1
12V
ADIN2
FB2
GPIO2
EN2
C3
0.1μF
R5-2
10Ω
RG2
15k
CG2
3.9nF
RS2
0.01Ω
Q2
FDD3706
R72
4.99k
R82
3.57k
R42
100k
CF2
0.1μF
R12
23.7k
R22
3.32k
R32
13.7k
Z2
SA14A
VIN2
3.3V
SENSE1–
SENSE2–
APPLICATIONS INFORMATION
相關(guān)PDF資料
PDF描述
LTC4227CGN-2#TRPBF POWER SUPPLY MANAGEMENT CKT, PDSO16
LTC4227IGN-1#PBF POWER SUPPLY MANAGEMENT CKT, PDSO16
LTC4227CUFD-1#TRPBF POWER SUPPLY MANAGEMENT CKT, PQCC20
LTC4227CUFD-2#TRPBF POWER SUPPLY MANAGEMENT CKT, PQCC20
LTC4227IGN-1#TRPBF POWER SUPPLY MANAGEMENT CKT, PDSO16
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