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FAN4868 Datasheet(PDF) 8 Page - ON Semiconductor

Part # FAN4868
Description  3 MHz, Synchronous TinyBoost Regulator
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

FAN4868 Datasheet(HTML) 8 Page - ON Semiconductor

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To ensure that VOUT does not pump significantly above
the regulation point, the boost switch remains off as long as
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−1 V)
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 restart 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.
Figure 15. Fault Response into Short Circuit
0 V
The fault clock period as a function of VIN is shown in
Figure 16.
Figure 16. Fault Clock Period vs. VIN
The VIN−dependent LIN Mode charging current is
illustrated in Figure 17
Figure 17. 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
Over−Current Protection (OCP)
During Boost Mode, the FAN4868 employs a
cycle−by−cycle peak current limit to protect switching
elements. Sustained current limit, for 32 consecutive fault
clock counts, initiates a fault condition.
During an overload condition, as VOUT collapses to
approximately VIN-1 V, 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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