Summit SMH4811A Technical data

查询SMH4811供应商

SUMMIT

MICROELECTRONICS, Inc.

Distributed Power Hot-Swap Controller

FEATURES

l Supply Range ±20VDC to >±500VDC
l Versatile Card Insertion Detection Supports:

w Multi-length Pin Systems
w Card Injector Switch Sensing

w Programmable Debounce Periods
l Control Powering-on of DC/DC Converters
l Highly Programmable Host Voltage Monitoring

w Programmable Under- and Over-voltage

Detection

w Programmable UV Filter
l Programmable Power Good Delay for enabling

the DC/DC Converter

SMH4811A

Preliminary

DESCRIPTION

The SMH4811A is designed to control hot swapping of
plug-in cards operating from a single supply ranging from
20V to 500V. It provides under-voltage and over-voltage
monitoring of the host power supply, drives an external
power MOSFET switch that connects the supply to the
load, and also protects against over-current conditions
that might disrupt the host supply. When the input and
output voltages to its controls are within specification, it
provides a Power Good logic output that may be used to
turn loads on (
or drive a LED status light). Additional features of the
SMH4811A include: temperature sense or master enable
input, 2.5V and 5V reference outputs for expanding moni­tor functions, two Pin-Detect enable inputs for fault protec­tion, and duty-cycle over-current protection.

e.g.

, an isolated-output DC-DC converter,

l Programmable Circuit Breaker Function

w Programmable Over-Current Filter

w Programmable Quick-Trip™ Circuit Breaker

Values

l 2.5V and 5.0V reference outputs

w Easy Expansion of External Monitor

Functions

SIMPLIFIED APPLICATION DRAWING

0V

Pin Detect

PD1#

UV

OV

VDD

Disable/Enable

ENPG

SMH4811A

FAULT#

PG#

DC/DC

Pin Detect

–48V

©SUMMIT MICROELECTRONICS, Inc., 2000 • 300 Orchard City Dr., Suite 131 • Campbell, CA 95008 • Phone [phone] • FAX [phone] • www.summitmicro.com

Characteristics subject to change without notice

PD2#

VSS

CBSENSE

2044 6.1 2/8/01

VGATE

2.5VREF

5.0VREF

2044 SAD 5.1

1

RECOMMENDED OPERATING CONDITIONS

Temperature –40°C to 85°C.

FUNCTIONAL BLOCK DIAGRAM

VDD

16

12VREF

PIN CONFIGURATION

16-Pin SOIC

SS

1
2
3
4
5
6
7
8

DRAIN SENSE

VGATE

EN/TS

PD1#
PD2#

FAULT#

CBSENSE

V

ENPG

14

SMH4811A

Preliminary

V

16
15
14
13
12
11
10

PG#
ENPG
NC

2.5V
5V
OV
UV

9

2044 PCon 5.0

DD

REF

REF

DRAIN

SENSE

EN/TS

PD1#
PD2#

UV

OV

VSS

CBSENSE

12

2.5VREF

+

1

50kΩ

ABLE

50mV

2.5V

200kΩ

+

–

+

–

FILTER

+

–

+

–

+

–

50kΩ

3

4
5

9

10

12V

5V

8

PROGRAMM-

DELAY

7

Programmable

Quick Response

Ref. Voltage

–

DUTY

CYCLE

TIMER

50kΩ

PROGRAMM-

ABLE

DELAY

VGATE
SENSE

11

5.0VREF

15

PG#

2

VGATE

6

FAULT#

2044 BD 5.2

2

2044 6.1 2/8/01

SUMMIT MICROELECTRONICS, Inc.

PIN DESCRIPTIONS

SMH4811A

Preliminary

DRAIN SENSE (1)

The DRAIN SENSE input monitors the voltage at the drain
of the external power MOSFET switch with respect to VSS.
An internal 10µA source pulls the DRAIN SENSE signal
towards the 5V reference level. DRAIN SENSE must be
held below 2.5V to enable the PG outputs.

VGATE (2)

The VGATE output activates an external power MOSFET
switch. This signal supplies a constant current output
(100µA typical), which allows easy adjustment of the
MOSFET turn on slew rate.

EN/TS (3)

The Enable/Temperature Sense input is the master en­able input. If EN/TS is less than 2.5V, VGATE will be
disabled. This pin has an internal 200kΩ pull-up to 5V.

PD1# and PD2# (4 & 5)

These are logic level active low inputs that can optionally
be employed to enable VGATE and the PG outputs when
they are at V

. These pins each have an internal 50kΩ

SS

pull-up to 5V.

FAULT# (6)

This is an open-drain, active-low output that indicates the
fault status of the device.

CBSENSE (7)

The circuit breaker sense input is used to detect over­current conditions across an external, low value sense
resistor (RS) tied in series with the Power MOSFET. A
voltage drop of greater than 50mV across the resistor for
longer than t

will trip the circuit breaker. A program-

CBD

mable Quick-Trip™ sense point is also available.

OV (10)

The OV pin is used as an over-voltage supply monitor,
typically in conjunction with an external resistor ladder.
VGATE will be disabled if OV is greater than 2.5V. A filter
delay is available on the OV input.

5.0VREF & 2.5VREF (11 & 12)

These are precision 5V and 2.5V output reference volt­ages that may be use to expand the logic input functions
on the SMH4803A. The reference outputs are with re­spect to V

SS

.

ENPG (14)

This is an active high input that controls the PG# output.
When ENPG is pulled low the PG# output is immediately
placed in a high impedance state. This pin has an internal
50kΩ pull-up to 5V.

PG# (15)

The PG# pin is an open-drain, active-low output with no
internal pull-up resistor. It can be used to switch a load or
enable a DC/DC converter. PG# is enabled immediately
after VGATE reaches V

– VGT and the DRAIN SENSE

DD

voltage is less than 2.5V. Voltage on these pins cannot
exceed 12V, as referenced to V

SS.

VDD (16)

VDD is the positive supply connection. An internal shunt
regulator limits the voltage on this pin to approximately
12V with respect to VSS. A resistor must be placed in
series with the VDD pin to limit the regulator current (RD in
the application illustrations).

VSS (8)

VSS is connected to the negative side of the supply.

UV (9)

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. Program­mable internal hysteresis is available on the UV input,
adjustable in increments of 62.5mV. Also available is a
filter delay on the UV input.

SUMMIT MICROELECTRONICS, Inc.

2044 6.1 2/8/01

3

ABSOLUTE MAXIMUM RATINGS*

SMH4811A

Preliminary

Temperature Under Bias ...................... –55°C to 125°C

Storage Temperature ........................... –65°C to 150°C

Lead Solder Temperature (10 secs) ................... 300 °C

Terminal Voltage with Respect to VSS:

V

................................. –0.5V to V

DD

DD

OV, UV, DRAIN SENSE,

CBSENSE...........–0.5V to VDD+0.5V

PD1#, PD2#, ENPG, EN/TS ......... 10V

FAULT#, PG# ........–0.5V to VDD+0.5V

VGATE ................................ VDD+0.5V

AC OPERATING CHARACTERISTICS

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DBC

t

DGP

t

NDTHSTSF

t

CYC

t

FVUP

t

DDP

Note: * Indicates default value

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*COMMENT

Stresses listed under Absolute Maximum Ratings may cause perma­nent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions
outside those listed in the operational sections of this specification is not
implied. Exposure to any absolute maximum rating for extended
periods may affect device performance and reliability.

004sµ
051sµ

*05sµ

5sµ

05sµ

052sµ
005sµ

5.1sm

*5sm
02sm
08sm

061sm

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5sm

08sm

061sm

5.0sm

5sm

*08sm

061sm

2044 Prog Table

4

2044 6.1 2/8/01

SUMMIT MICROELECTRONICS, Inc.

DC OPERATING CHARACTERISTICS

(Over Recommended Operating Conditions; Voltages are relative to VSS)

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V

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V

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V

VO

V

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V

ETAGV

I

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V

ESNES

I

ESNES

V

BC

V

BCQ

V

STNE

V

V
V

V

V

Note: (1) TA = 25ºC.

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Am3=112131V

DD

Am3=57.400.552.5V

DD

Am3=1– 1Am

DD

Am3=)1(574.2005.2525.2V

DD

Am3=524.2005.2575.2V

DD

Am3=2.0– 1Am

DD

Am3=)1(574.2005.2525.2V

DD

Am3=524.2005.2575.2V

DD

Am3=01Vm

DD

Am3=)1(574.2005.2525.2V

DD

Am3=524.2005.2575.2V

DD

Am3=01Vm

DD

Am3=)1(574.2005.2525.2V

DD

Am3=524.2005.2575.2V

DD

V=

ESNES

DD

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SS

Am3=040506Vm

ffO —

Am3=)1(574.2005.2525.2V

DD

Am3=524.2005.2575.2V

DD

Am3=01Vm

DD

Am2=0 4.0V

LO

Am2=0 4.0V

KNIS

SMH4811A

Preliminary

DD

002Vm
001Vm

06Vm

2044 Elect Table

V

SUMMIT MICROELECTRONICS, Inc.

2044 6.1 2/8/01

5