MIC2585-2MBTS TR【PDF 18/28 页】IC CTRLR HOT SWAP DUAL 24-TSSOP

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Sheet目录44

14页 15页 16页 17页 [18页]19页 20页 21页 22页

MIC2584/2585

Micrel

MIC2584/2585

March 2005

0.1礔

47k&

SENSE1

VCC1

SENSE1

0.007&

SENSE2

VCC2

SENSE2

0.015&

0.022礔

**Q2

Si4922DY (1)

(SO-8)

LOAD1

1500礔

OUT1

5V@5A

OUT2

1.8V@2A

LOAD2

100礔

0.022礔

**Q1

Si4922DY (2)

(SO-8)

GND

GATE2

OUT2

TRK

OUT1

FB2

FB1

GATE1

CDLY

CFILTER

Undervoltage (OUT1) = 4.4V

Undervoltage (OUT2) = 1.5V

Circuit Breaker Response Time = 5ms

Sequenced Output Delay = 20ms

*Diodes are BZX84C(x)V(x)

**Si4922DY is a dual Power MOSFET

Additional pins omitted for clarity

0.01礔

1礔

10.5k&

15.8k&

39.2k&

8.06k&

*D1

(8V)

*D2

(6V)

1礔

MIC2585-1

IN1

IN2

1.8V

Figure 6. Output Sequencing/Tracking Combination

Applications Information

Output Tracking and Sequencing

The MIC2585 is equipped with optional supply

settings: Tracking or Sequencing. There are many applica-

tions that require two supplies to track one another within a

specified maximum potential difference (or time) during power-

up and power-down, such as in switching a processor on and

off. In many other systems and applications, supply sequenc-

ing during turn-on may be essential such as when a specific

circuit block (e.g., a system clock) requires available power

before another block of system circuitry. For either supply

configuration, the MIC2585 requires only one additional

component and can be used as an integrated solution to

traditional, and most often complex, discrete circuit solutions.

Additionally, the two optional supply settings may be com-

bined to provide supply sequencing during start-up and

supply tracking during turn-off (see Figure 6 below). The

MIC2585 guarantees supply tracking within 250mV for power-

up and power-down independent of the load capacitance of

each supply. See "Figure 2" of the "Timing Diagrams".

Wiring the TRK pin to either OUT1 or OUT2 of the MIC2585

enables the tracking feature. The OUT1 and OUT2 pins

provide output track sensing and are wired directly to the

output (source) of the external MOSFET for Channel 1 and

Channel 2, respectively.

The MIC2584/85 can also be used in systems that support

more than two supplies. Figure 7 illustrates the generic use

of two separate controllers configured to support four inde-

pendent supply rails with an associated output timing re-

sponse. The PG (or /POR) output of the first controller is used

to enable the second controller. As configured, a fault condi-

tion on either V

OUT1

or V

OUT2

will result in all channels being

shut down. For systems with multiple power sequencing

requirements, the controllers output tracking and sequenc-

ing features can be implemented in order to meet the systems

timing demands.

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