SMH4802 Datasheet, PDF (3/20 Pages) Summit Microelectronics, Inc. – Programmable -48V Hot-Swap Controller with Forced Shut Down

PIN CONFIGURATION
14-Pin SOIC
DRAIN SENSE 1
VGATE 2
EN/TS 3
SDA 4
SCL 5
CBSENSE 6
V_SS 7
14 V_DD
13 nc
12 PG#
11 5VREF
10 FS#
9 OV
8 UV
2062 14 PCon
SMH4802
Preliminary Information
16-Pin SSOP
DRAIN SENSE 1
VGATE 2
EN/TS 3
nc 4
SDA 5
SCL 6
CBSENSE 7
V_SS 8
16 V_DD
15 nc
14 PG#
13 nc
12 5VREF
11 FS#
10 OV
9 UV
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
1
I
DRAIN measure is with respect to V_SS). 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_DD, used to turn
2
O
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.
3
I
EN/TS
The ENable/Temperature Sense input is the master enable input. VGATE will be
disabled if EN/TS is less than 2.5V. This pin has an internal 200kΩ pullup to 5V.
4
I/O
SDA
SDA is the bidirectional serial data pin. It is configured as an open drain output.
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
5
I
SCL
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.
The Circuit Breaker SENSE input is used to detect over-current conditions across
an external, low value sense resistor (R_S) tied in series with the power MOSFET.
6
I
CBSENSE A voltage drop of greater than 50mV across the resistor for longer than t_CBD will
trip the circuit breaker. To disable CBSENSE connect the pin directly to V_SS. A
programmable Quick-Trip sense point is also available.
7
PWR
8
I
V_SS
V_SS is connected to the, negative side of the supply. All inputs and the 5VREF
output are referenced to V_SS.
The UV pin is used as an under-voltage supply monitor, typically in conjunction
UV
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
3