FAN4860UMP5X datasheet(10/15 Pages) FAIRCHILD

No de pièce	FAN4860UMP5X

Description	3MHz, 5V Output Synchronous TinyBoost??Regulator

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Fabricant	FAIRCHILD [Fairchild Semiconductor]

Site Internet	http://www.fairchildsemi.com

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FAN4860 • Rev. 1.0.3

10

To ensure that VOUT does not pump significantly above the

regulation point, the boost switch remains off as long as

FB > VREF.

Fault State

The regulator enters the FAULT state under any of the

following conditions:

VOUT fails to achieve the voltage required to advance from

LIN state to SS state.

VOUT fails to achieve the voltage required to advance from

SS state to BST state.

Sustained (32 CLK counts) pulse-by-pulse current limit

during the BST state.

The regulator moves from BST to LIN state due to a short

circuit or output overload (VOUT < VIN-1V).

Once a fault is triggered, the regulator stops switching and

presents a high-impedance path between VIN and VOUT. After

waiting 480 CLK counts, a re-start is attempted.

Soft-Start and Fault Timing

The soft-start timing for each state, and the fault times, are

determined by the fault clock, whose period is inversely

proportional to VIN. This allows the regulator more time to

charge larger values of COUT when VIN is lower. With higher

VIN, this also reduces power delivered to VOUT during each

cycle in current limit.

The number of clock counts for each state is illustrated in

Figure 27.

Figure 27. Fault Response into Short Circuit

The fault clock period as a function of VIN is shown in Figure 28.

Figure 28. Fault Clock Period vs. VIN

The VIN-dependent LIN mode charging current is illustrated

in Figure 29.

Figure 29. LIN Mode Current vs. VIN

Over-Temperature Protection (OTP)

The regulator shuts down when the thermal shutdown

threshold is reached. Restart, with soft-start, occurs when

the IC has cooled by about 30°C.

Over-Current Protection (OCP)

During boost-mode operation, the FAN4860 employs a

cycle-by-cycle peak current limit to protect switching

elements. Sustained current limit, for 32 consecutive fault

CLK counts, initiates a fault condition.

During an overload condition, as VOUT collapses to

approximately

VIN-1V,

the

synchronous

rectifier

is

immediately switched off and a fault condition is declared.

Automatic restart occurs once the overload/short is removed

and the fault timer completes counting.

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