Laptop Chip SEMTECH SC1485ITS Dual Output Constant On Synchronousbuck PWM Controller
Description:
The SC1485ITS is a dual output constant on synchronousbuck PWM controller intended for use in notebook computers and other battery operated portable devices. Features include high efficiency and a fast dynamic response with no minimum on time. The excellent transient response, means that SC1485ITS based solutions will require less output capacitance than competing fixed frequency converters.
The frequency is constant until a step in load or line voltage occurs at which time the pulse density and frequency will increase or decrease to counter the change in output or input voltage. After the transient event, the controller frequency will return to steady state operation. At light loads, Power-Save Mode enables the SC1485ITS to skip PWM pulses for better efficiency.
Each output voltage can be independently adjusted from 0.5V to VCCA. Two frequency setting resistors set the on-time for each buck controller. The frequency can thus be tailored to minimize crosstalk. The integrated gate drivers feature adaptive shoot-through protection and soft switching. Additional features include cycle-by-cycle current limit, digital soft-start, over-voltage and undervoltage protection, and a PGOOD output for each controller.
Features:
- Constant on-time for fast dynamic response
- Programmable VOUT range = 0.5 ?§C VCCA
- VIN Range = 1.8V ?§C 25V
- DC current sense using low-side RDS(ON) sensing or sense resistor
- Resistor programmable frequency
- Cycle-by-cycle current limit
- Digital soft-start
- Separate PSAVE option for each switcher
- Over-voltage/Under-voltage fault protection
- 10uA Typical shutdown current
- Low quiescent power dissipation
- Two PGOOD indicators
- 1% Reference (2% system DC accuracy)
- Efficiency >90%
- Integrated gate drivers with soft switching
- Separate enables
- 28 Lead TSSOP
- Industrial temperature range
Package included:
- 1 x SEMTECH SC1485ITS Dual Output Constant On Synchronousbuck PWM Controller
