SC1485: Dual Synchronous Buck Pseudo-Fixed-Frequency Power-Supply Controller
The SC1485 is a dual output constant-on synchronous buck 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.
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- Constant on-time for fast dynamic response
- Programmable VOUT range = 0.5 – VCCA
- VIN range = 1.8 V – 25 V
- 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
- 10 µA 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
- Industrial temperature range
- 28-lead TSSOP package
- Notebook computers
- CPU I/O supplies
- Handheld terminals and PDAs
- LCD monitors
- Network power supplies
- SC1485ITSTR: Package Minimum Tape & Reel Only
- SC1485ITSTRT: Lead-Free, RoHS and WEEE Compliant, Package Minimum Tape & Reel Only
