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SC1104A/B
Simple, Synchronous
Voltage Mode PWM Controller
POWER MANAGEMENT
Description Features
The SC1104A/B is a versatile voltage-mode PWM con- Up to +14V input, 300kHz operation (SC1104A)
troller designed for use in single ended DC/DC power Up to +7V input, 600kHz operation (SC1104B)
supply applications. A simple, fixed frequency high effi- High efficiency (>90%)
ciency buck regulator can be implemented using the 1% Reference voltage accuracy
SC1104A/B with a minimum of external components. Hiccup mode over current protection
Internal level shift and drive circuitry eliminates the need
Robust output drive
for an expensive P-channel, high-side switch. The small
device footprint allows for compact circuit design. RDS(ON) Current sensing
Industrial temperature range
SC1104A/B features include temperature compensated 8-Lead SOIC package. Pb-free package available,
voltage reference, triangle wave oscillator, current limit fully WEEE and RoHS compliant
comparator and an externally compensated error ampli-
fier. Current limit is implemented by sensing the voltage Applications
drop across the top FET's RDS(ON).
Termination supplies
The SC1104 operates at fixed frequencies of Low cost microprocessor supplies
300kHz(A) or 600kHz(B) providing an optimum com- Peripheral card supplies
promise between efficiency, external component size, Industrial power supplies
and cost. 600kHz switching frequency is reserved for High density DC/DC conversion
the SC1104B, +5VCC operation only.
SC1104A/B has a thermal protection circuit, which is
activated if the junction temperature exceeds 150