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SC632ULTRT Datasheet(PDF) 11 Page - Semtech Corporation

Part # SC632ULTRT
Description  Fixed 5.0V Output Charge Pump Regulator
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC632ULTRT Datasheet(HTML) 11 Page - Semtech Corporation

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SC632
11
Short-Circuit Current Protection
Short-circuit current protection is provided to limit the
current that can be sourced when the output is shorted to
ground. When a short circuit forces V
OUT
to drop below 2V,
the SCCP detects the condition and limits the output
current to 600mA (typical).
Over-Temperature Protection
The over-temperature circuit helps prevent the device
from overheating and experiencing a catastrophic failure.
When the junction temperature exceeds 165°C, the device
is disabled. It remains disabled until the junction tempera-
ture drops below this threshold. Hysteresis is included
that prevents the device from re-enabling until the junc-
tion temperature is reduced by 20°C.
Capacitor Selection
The SC632 is designed to use low-ESR ceramic capacitors
for the input and output bypass capacitors as well as the
charge pump bucket capacitors. Ideal performance is
achieved when the bucket capacitors are exactly equal.
The value of input and output decoupling capacitors will
vary with system requirements. For best ripple perfor-
mance C
IN
and C
OUT
are normally 22μF and the bucket
capacitors C
1
and C
2
are 2.2μF. For low profile designs, two
10μF capacitors may be used in place of each 22μF.
Applications Information (continued)
When selecting capacitors for an application, first consider
the DC voltage characteristic of the capacitor. The value
of capacitance at the DC operating voltage may be con-
siderably lower than the rated value. The following table
lists recommended capacitor values which have been
chosen to minimize the impact of this limitation.
Table 1 — Recommended Capacitors
Capacitor
Value
μF
Case
Size
Notes
C
IN
, C
OUT
22
0805
Typical output V
PP
≤ 20mV in all
charge pump modes
Typical input ripple ≤ 100mV in all
charge pump modes
C
BUCKET
2.2
0603
Required for the full rated output
current
C
BUCKET
2.2
0402
Useful for load current up to
300mA
NOTE: Use only X5R type capacitors, with a 6.3V rating or higher
The highest capacitance values in the smallest package
sizes will tend to have poor DC voltage characteristics.
The highest value 0402 size capacitor retains as little as
35% of its rated value at 5VDC. The same value chosen in
the next larger package size, 0603, will retain about 60%
of its rated value at 5VDC.


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