Datasheet > SMH4802_09

SMH4802_09

更新时间： 2022-03-25 08:54:09

品牌	Logo	应用领域
SUMMIT		控制器
页数	文件大小	规格书
19页	631K
描述
Programmable -48V Hot-Swap Controller with Forced Shut Down

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SMH4802_09 数据手册

SMH4802

Preliminary Information

PIN CONFIGURATION

14-Pin SOIC

16-Pin SSOP (Engineering only)

V_DD

PG#

5VREF

FS#

V_DD

PG#

5VREF

FS#

DRAIN SENSE

VGATE

EN/TS

DRAIN SENSE

VGATE

EN/TS

SDA

SCL

CBSENSE

V_SS

SDA

SCL

CBSENSE

V_SS

2062 14 PCon

2062 16 PCon

PIN DESCRIPTIONS

Pin No. Type

Pin Name

Pin Description

The DRAIN SENSE input monitors the voltage at the drain of the MOSFET (the

DRAIN measure is with respect to V ). An internal 10µA source pulls the DRAIN

SENSE SENSE signal towards the 5VREF level. DRAIN SENSE must be held below

2.5V to enable the PG# output.

The VGATE output is a high side drive output, nearly equal to V , used to turn

VGATE

on an external power MOSFET. This signal supplies a constant current output

(100µA typical) which allows easy adjustment of the MOSFET turn-on slew rate.

The ENable/Temperature Sense input is the master enable input. VGATE will be

EN/TS

SDA

disabled if EN/TS is less than 2.5V. This pin has an internal 200kΩ pullup to 5V.

SDA is the bidirectional serial data pin. It is configured as an open drain output.

I/O

There is an internal 50kΩ resistor connected to 5VREF.

The SCL input is used to clock data into and out of the configuration registers. In

the write mode data must remain stable on SDA while SCL is HIGH. In the read

mode data is clocked out on the falling edge of SCL. There is an internal 50kΩ

resistor connected to 5VREF.

SCL

The Circuit Breaker SENSE input is used to detect over-current conditions across

an external, low value sense resistor (R ) tied in series with the power MOSFET.

CBSENSE A voltage drop of greater than 50mV across the resistor for longer than t will

CBD

trip the circuit breaker. To disable CBSENSE connect the pin directly to V . A

programmable Quick-Trip sense point is also available.

is connected to the, negative side of the supply. All inputs and the 5VREF

PWR

output are referenced to V .

The UV pin is used as an under-voltage supply monitor, typically in conjunction

with an external resistor ladder. VGATE will be disabled if UV is less than 2.5V.

A programmable internal hysteresis is available on the UV input, adjustable in

increments of 62.5mV. A filter delay is also available on the UV input.

Note: Pin numbers reflect the 14 Pin SOIC package.

2062 Pin Table A

SUMMIT MICROELECTRONICS, Inc.

2062 2.3 6/19/03

1 234 5 6 7...19

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