LTC4214 View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC4214

Hot Swap Controller

Linear Technology 

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LTC4214-1/LTC4214-2

APPLICATIO S I FOR ATIO

Circuit Breaker Timing

In Figure 13a, the TIMER capacitor charges at 40µA if the

SENSE pin exceeds VCB but VDRN is less than 4.2V. If the

SENSE pin drops below VCB before TIMER reaches the

VTMRH threshold, TIMER is discharged by 5µA. In Figure

13b, when TIMER exceeds VTMRH, GATE pulls down

immediately and the LTC4214 shuts down. In Figure 13c,

multiple momentary faults cause the TIMER capacitor to

integrate and reach VTMRH. GATE pull down follows and

the LTC4214 shuts down. During shutdown, the LTC4214-1

latches TIMER high with a 5µA pull-up current source; the

LTC4214-2 activates a shutdown cooling cycle.

1

VTMRH

TIMER

2

5µA

40µA + 8 • IDRN

GATE

1

VTMRH

TIMER

GATE

CB TIMES OUT

2

40µA + 8 • IDRN

CB TIMES OUT

1

VTMRH

TIMER

2

34

5µA

40µA + 8 • IDRN

40µA + 8 • IDRN

GATE

SS

SENSE

VOUT

DRAIN

VACL

VCB

SS

SENSE

VACL

VCB

VOUT

DRAIN

VDRNCL

SS

SENSE

VOUT

DRAIN

VACL

VCB

VDRNCL

PWRGD

CB FAULT

(13a) Momentary Circuit-Breaker Fault

PWRGD

CB FAULT

(13b) Circuit-Breaker Time Out

PWRGD

CB FAULT

4214 F13

CB FAULT

(13c) Multiple Circuit-Breaker Fault

Figure 13. Circuit-Breaker Timing Behavior (All Waveforms are Referenced to VEE)

421412f

25

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