Semtech Corporation SC1144
The SC1144 is a high performance, multi-phase (PWM) controller designed for high power microprocessors requiring ultra fast transient response, such as ® the Pentium ll and beyond. This approach greatly reduces the stress and heat on the output stage components while lowering input ripple current by as much as 80%. The high speed transconductance error amplifier is externally initialized using a soft-start capacitor allowing the controller to “wake-up” without overshoot, thus protecting the low voltage microprocessor loads.| Part No. | SC1144 |
|---|---|
| Datasheet | SC1144 Download |
| Manufacturer |  Semtech Corporation |
| Description | PROGRAMMABLE/ HIGH PERFORMANCE MULTI-PHASE/ PWM CONTROLLER |
| Buy | Stock & Price |
DESCRIPTION
Utilizing a novel and unique design, the controller distributes the output load across (up to) four converter channels by digitally phase shifting the PWM outputs. Accurate current sharing among the four phases is achieved by precision design techniques and trimming of critical elements. The output drive voltage to the power MOSFETs is programmable to minimize switching losses in the drive circuitry. The floating feedback ground allows remote sense capability. The output voltage is digitally programmable by means of a 5 bit DAC. A single resistor programs the master clock frequency (8MHz max) or the controller may be synchronized using an external oscillator. The number of operating phases is programmed independently of the external clock. The parts features under-voltage lock-out with hysteresis and overcurrent protection.FEATURES
● Allows use of small surface mount components● Ultra fast transient recovery time
● Wide, High frequency operating range
● Selectable 2, 3, 4...
