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參數(shù)資料
| 型號(hào)： | LTC4213IDDB#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 10/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CIRC BREAK ELEC 8-DFN |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | * |
| 類型： | * |
| 應(yīng)用： | * |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-WFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 8-DFN（3x2） |
| 包裝： | 帶卷 (TR) |
LTC4213
18
4213f
APPLICATIO S I FOR ATIO
WU
U
4213 F06
+
LTC4213
VCC
ON
READY
C1
10F
CLOAD
100F
R4
10k
ISEL
GND
GATE
Q1
SI4410DY
Q2
2N7002
VIN
VOUT
5V
1A
SENSEN
SENSEP
CIN
100F
R1
33
D1
MBRO520L
R3
324k
R2
80.6k
RESET
VIN
5V
+
C2
0.22F
Figure 6. Single Supply Electronic Fuse
SENSEP exceeds VCC + 0.7V for more than 65s, the
LTC4213’s internal overvoltage protection circuit acti-
vates and the GATE pin pulls down and turns off the
external MOSFET.
Typical Electronic Fuse Application for a Single
Supply System
Figure 6 shows a single supply electronic fuse application.
An RC filter at VCC pin filters out transient spikes. An
optional Schottky diode can be added if severe VCC dips
during a fault start-up condition is a concern. The use of
the Schottky and RC filter combination is allowed if the
load supply is above 2.9V and the total voltage drop
towards the VCC pin is less than 0.4V. The LTC4213’s
internal UVLO filter further rejects bias supply’s transients
of less than tRESET. During power-up, it is good engineer-
ing practice to ensure that VCC is fully established before
the ON pin enables the system at VON = 0.8V. In this
application, the VCC voltage reached final value approxi-
mately after a 5.3 R1 C1 delay. This is followed by the ON
pin exceeding 0.8V after a 0.17 R2C2 delay. The GATE pin
starts up after an internal tDEBOUNCE delay.
Hot Swap is a trademark of Linear Technology Corporation.
Typical Single Supply Hot Swap Application
A typical single supply Hot Swap application is shown in
Figure 7. The RESET signal at the backplane is held low
initially. When the PCB long edge makes contact the ON
pin is held low (<0.4V) and the LTC4213 is kept in reset
mode. When the short edge makes contact the VIN load
supply is connected to the card. The VCC is biased via the
RC filter. The VOUT is pre-charged via R5. To power-up
successfully, the R5 resistor value should be small enough
to provide the load requirement and to overcome the
280A current source sinking into the SENSEN pin. On the
other hand, the R5 resistor value should be big enough
avoiding big inrush current and preventing big short
circuit current. When RESET signals high at backplane, C2
capacitor at the ON pin charges up via the R3/R2 resistive
divider. When ON pin voltage exceeds 0.8V, the GATE pin
begins to ramp up. When the GATE voltage peaks, the
external MOSFET is fully turned on and the VIN-to-VOUT
voltage drop reduces. In normal mode operation, the
LTC4213 monitors the load current through the RDSON of
the external MOSFET.
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