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| 型号： | LTC4222IUH#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/32页 |
| 文件大小： | 339K |
| 描述： | IC CTRLR DUAL HOT SWAP 32-QFN |
| 标准包装： | 2,500 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 电源电压： | 2.9 V ~ 29 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN 裸露焊盘（5x5） |
| 包装： | 带卷 (TR) |
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LTC4222
13
4222fb
Figure 1. Typical Application
A MOSFET is turned on by charging up the GATE with a
12礎 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 C
SS
.
This is accomplished using the current limit amplifier
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 profile 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 100礎 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 INTV
CC
.
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 configuration, 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 V
DD1
LTC4222
GATE1
INTV
CC
ADR2
ADR1
NC
ADR0
CONFIG
SOURCE1
UV2 V
DD2
GATE2
SOURCE2
OV1
OV2
ALERT
SCL
SDA
ON
FB1
ADIN1
TIMER
GPIO1
EN1
SS
PLUG-IN
CARD
R5-1
10
R
G1
15k
C
G1
3.9nF
C
TIMER
0.68礔
C
SS
68nF
R
S1
0.01
Q1
FDD3706
R71
10.2k
R81
3.57k
R41
100k
4222 TA01a
C
F1
0.1礔
R11
140k
R21
4.53k
R31
13.7k
Z1
SA14A
BACKPLANE
GND
GND
ALERT
SCL
ON
SDA
V
IN1
12V
ADIN2
FB2
GPIO2
EN2
C3
0.1礔
R5-2
10
R
G2
15k
C
G2
3.9nF
R
S2
0.01
Q2
FDD3706
R72
4.99k
R82
3.57k
R42
100k
C
F2
0.1礔
R12
23.7k
R22
3.32k
R32
13.7k
Z2
SA14A
V
IN2
3.3V
SENSE1
SENSE2
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| LTC4223 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Ideal Diode and Hot Swap Controller |
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| LTC4223CDHD-1#PBF | 功能描述:IC CNTRLR HOT SWAP DUAL 16-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| LTC4223CDHD-1#TRPBF | 功能描述:IC CNTRLR HOT SWAP DUAL 16-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
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