LTC4216IMS 查看數據表（PDF） - Linear Technology

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LTC4216IMS

Ultralow Voltage Hot Swap Controller

Linear Technology 

LTC4216

Typical Performance Characteristics

IFILT(UP) vs Temperature

–70

–65

–60

–55

–50

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

4216 G16

IFILT(DN) vs Temperature

2.8

2.6

2.4

2.2

2.0

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

4216 G17

ISS(UP) vs Temperature

–12

VFB = 2V

–10

–8

–6

–4

–2

0

–50 –25

VFB = 0V

0 25 50 75

TEMPERATURE (°C)

100 125

4216 G18

Pin Functions (DE12/Package/MS Package)

RESET (Pin 1/Pin 1): Reset or Power-Good Output. Open

drain output that pulls low if the FB pin voltage falls below

its threshold (0.6V). During the start-up cycle, the RESET

pin goes high impedance at the end of the second timing

cycle after the FB pin goes above the FB threshold. This

pin requires an external pull-up to a positive supply. If an

undervoltage lockout condition occurs, the RESET pin

pulls low and ignores the FB pin voltage.

ON (Pin 2/Pin 2): ON Control Input. A rising edge above

the ON pin threshold (0.8V) initiates the start-up cycle

and turns on the external N-channel MOSFET. A falling

edge below 0.72V (80mV ON pin hysteresis) turns it off.

If this pin is pulled below 0.4V, following a circuit breaker

trip, it resets the electronic circuit breaker and fault latch.

FILTER (Pin 3/Pin 3): Fault Filter Input. Connect a capacitor

between this pin and ground to set up the fault filter delay.

This pin sources 60µA or sinks 2.4µA when the voltage

across the sense resistor exceeds 25mV or drops below

25mV respectively. The filter comparator rising threshold

is 1.253V.

TIMER (Pin 4/Pin 4): Timer Input. Connect a capacitor

between this pin and ground to set up the start-up timing

cycle duration. It also defines the RESET power-good delay

from the instant the FB pin voltage exceeds 0.6V. This pin

sources 2µA pull-up current during ramp up. The timer

comparator rising threshold is 1.253V.

SS (Pin 5/Not Available): Soft-Start Control Input. Con-

nect a capacitor between this pin and ground for soft-start

during power-up. It controls the GATE ramp up, limiting

the rate of change of the inrush current when the external

MOSFET turns on. If soft-start function is not used, leave

this pin unconnected.

GND (Pin 6/Pin 5): Device Ground.

FB (Pin 7/Pin 6): Output Monitor for Reset Output. A resis-

tive divider from the external MOSFET’s source terminal is

tied to this pin. When the voltage at this pin drops below

0.6V, the RESET pin pulls low. The FB comparator falling

threshold is 0.602V.

GATE (Pin 8/Pin 7): Gate Drive for External N-Channel

MOSFET. An internal charge pump provides 20µA gate

pull-up current and sufficient gate overdrive to the external

MOSFET. An internal shunt regulator limits the GATE pin

voltage to about 6.2V (typ) above the SENSEN pin voltage.

SENSEN (Pin 9/Pin 8): Circuit Breaker Negative Sense

Input. Connect this pin to the sense resistor terminal wired

to the drain of the external N-channel MOSFET. The sense

4216fa

6

For more information www.linear.com/LTC4216

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