NIS5431 Series

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2

VIN

VOUT

Enable/Fault

GND

Thermal

Shutdown

Charge

Pump

Current

Limit

dv/dt

Control

Enable

UVLO

dV/dt

I LIMITB

Voltage

Clamp

Figure 1. Block Diagram

I LIMITA

FUNCTIONAL PIN DESCRIPTION

Pin

Function

Description

1−5

Source

This pin is the source of the internal power FET and the output terminal of the fuse.

6

7

8

Enable/Fault

The enable/fault pin is a tri−state, bidirectional interface. It can be used to enable or disable the

output of the device by pulling it to ground using an open drain or open collector device. If a thermal

fault occurs, the voltage on this pin will go to an intermediate state to signal a monitoring circuit that

the device is in thermal shutdown. It can also be connected to another device in this family to cause

a simultaneous shutdown during thermal events.

9

dv/dt

The internal dv/dt circuit controls the slew rate of the output voltage at turn on. It has an internal ca-

pacitor that allows it to ramp up over a period of 1.4 ms. An external capacitor can be added to this

pin to increase the ramp time. If an additional time delay is not required, this pin should be left open.

10

Ground

Negative input voltage to the device. This is used as the internal reference for the IC.

11 (belly pad)

Positive input voltage to the device.

MAXIMUM RATINGS

Rating

Symbol

Value

Unit

−0.6 to 14

V

Thermal Resistance, Junction−to−Air

JESD51−7 4−layer board

154

93

50

°C/W

Thermal Resistance, Junction−to−Lead (Pin 1)

49

°C/W

Thermal Resistance, Junction−to−Case

20

°C/W

2.5

W

Operating Temperature Range (Notes 3 and 4)

−40 to 150

°C

Nonoperating Temperature Range

−55 to 155

°C

Lead Temperature, Soldering (10 Sec)

260

°C

Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality

should not be assumed, damage may occur and reliability may be affected.

1. Negative voltage will not damage device provided that the power dissipation is limited to the rated allowable power for the device.

2. 1 oz copper, double−sided FR4.

3. Thermal limit is set above the maximum thermal rating. It is not recommended to operate this device at temperatures greater than the

maximum ratings for extended periods of time.