LTC4213IDDB#PBF Linear Technology, LTC4213IDDB#PBF Datasheet - Page 18

• Manufacturer Part Number: LTC4213IDDB#PBF
• Manufacturer: Linear Technology

Specifications of LTC4213IDDB#PBF

• Linear Misc Type: Positive Low Voltage
• Package Type: DFN EP
• Operating Supply Voltage (min): 2.3V
• Operating Supply Voltage (max): 6V
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Product Length (mm): 3mm
• Mounting: Surface Mount
• Pin Count: 8
• Lead Free Status / RoHS Status: Compliant

APPLICATIO S I FOR ATIO
LTC4213
SENSEP exceeds V
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 V
optional Schottky diode can be added if severe V
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 V
internal UVLO filter further rejects bias supply’s transients
of less than t
ing practice to ensure that V
the ON pin enables the system at V
application, the V
mately after a 5.3 • R
pin exceeding 0.8V after a 0.17 • R
starts up after an internal t
18
RESET
CC
CC
CC
pin is less than 0.4V. The LTC4213’s
. During power-up, it is good engineer-
U
CC
1
voltage reached final value approxi-
pin filters out transient spikes. An
C
1
+ 0.7V for more than 65µs, the
delay. This is followed by the ON
U
DEBOUNCE
RESET
CC
V
5V
IN
is fully established before
100µF
2N7002
2
C
C
IN
W
2
Q2
delay.
delay. The GATE pin
+
ON
= 0.8V. In this
Figure 6. Single Supply Electronic Fuse
80.6k
324k
R3
R2
U
10µF
33Ω
C1
CC
R1
dips
D1
MBRO520L
C2
0.22µF
V
ON
CC
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 V
supply is connected to the card. The V
RC filter. The V
successfully, the R5 resistor value should be small enough
to provide the load requirement and to overcome the
280µA 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 V
voltage drop reduces. In normal mode operation, the
LTC4213 monitors the load current through the R
the external MOSFET.
SENSEP
GND
LTC4213
SI4410DY
GATE
Q1
I
SEL
SENSEN
READY
OUT
100µF
C
LOAD
10k
R4
is pre-charged via R5. To power-up
+
V
IN
4213 F06
V
5V
1A
OUT
CC
is biased via the
IN
-to-V
DSON
IN
load
OUT
4213f
of