SMH4811AG データシートの表示（PDF） - Summit Microelectronics

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SMH4811AG

Distributed Power Hot-Swap Controller

Summit Microelectronics 

SMH4811A

Preliminary

CBSENSE

<TCBD

VQCB

50mV

VGATE

TFSTSHTDN

2044 Fig03 5.0

Figure 3. Circuit Breaker Timing — Quick Trip

PROGRAMMABLE FEATURES

The SMH4811A has programmable time and voltage

functions that can be fine-tuned for a wide variety of

applications. Because of this a manufacturer can use a

common part type across a wide range of boards that are

used on a common host but have different electrical loads,

power-on timing requirements, host voltage monitoring

needs, etc. This ability shifts the focus of design away

from designing a new power interface for each board to

concentrating on the value added back-end logic. Be-

cause the programming is done at final test all combina-

tions (all 128 possibilities) are readily available as off the

shelf stock items.

Also see the AC Operating Characteristics Table.

Pin Detect

The Pin Detect function can be enabled or disabled.

Circuit Breaker Delay

13

The circuit breaker delay defines the period of time the

voltage drop across RS is greater than 50mV but less than

12

VQCB before the VGATE output will be shut down. This is

effectively a filter to prevent spurious shutdowns of

VGATE.

11

Temp, ºC

–40

0

25

85

10

125

Power Good Delay

The PG delay timer that controls the delay to PG# being

asserted.

Quick-Trip Circuit Breaker Threshold

9

0

2

4

6

8

10

12

This is the threshold voltage drop across RS that is placed

between VSS and CBSENSE.

IDD (mA)

2044 Fig04

Figure 4. Effect of Temperature on Current Con-

sumption Over Voltage Range

SUMMIT MICROELECTRONICS, Inc.

2044 6.1 2/8/01

9

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