S39421 View Datasheet(PDF) - Summit Microelectronics

Part Name

Description

Manufacturer

S39421

Hot Swap Voltage Controller

Summit Microelectronics 

S39421

Boosting RESET Output Drive

The slew-rate of the RESET output is >30V/µs at the LO

to HI logic transition with a 50pF load and a 1.5ký pull-up

resistor. If the RESET output needs to drive a larger load

capacitance or needs to slew faster, then an external NPN

transistor or N-channel MOSFET must be added to boost

output current. The RESET output drives the external

transistor providing a current sink capability of >30mA on

the RESET output. Using the boost circuit with a 430ý

pull-up resistor and 100pF load capacitance, the slew-

rate increases to >50V/µs. See diagrams below.

S39421 - Circuits to Increase RESET Output Drive

RESET

RESET

3.9kΩ

2N3904

RESET

RESET

TN0200T

10kΩ

GND

4.7kΩ

GND

FIGURE 21. RESET CURRENT BOOST CIRCUIT

2024 ILL26.0

2024 9.0 8/8/00

18

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