3.5 A Constant On-Time, Step-Down DC-DC Converter

The SKY87203 is a variable switching frequency, 3.5 A constant on-time, synchronous step-down converter. The device provides an output voltage from 0.9 V to 4.0 V from input voltage ranging from 2.7 V to 6.0 V, while keeping excellent line and load regulation and maximizing efficiency.

The constant on-time control allows easy loop stabilization with minimal external components while providing fast transient response.

Power sequencing is controlled by the EN and PG pins.

The SKY87203 has cycle-by-cycle current limits and thermal shutdown to protect against fault conditions. The SKY87203 is available in a 12-pin, 2 mm x 2 mm Quad Flat No-Lead (QFN) package.

Please note: SKY87203-11-631LF is being discontinued and is not recommended for new designs.


    • Input voltage range: 2.7 V to 6.0 V
    • Output voltage range: 0.9 V to 4.0 V
    • Variable switching frequency: 600 kHz to 1.5 MHz
    • Up to 3.5 A continuous output current
    • 95% peak efficiency
    • Typical switch on resistance: 50 mΩ PMOS, 40 mΩ NMOS
    • 80% light load efficiency
    • Power sequencing
    • Cycle-by-cycle over-current protection
    • Auto-discharge at power-off
    • Over-temperature protection
    • Control loop stabilization with low ESR ceramic capacitors
    • Soft start
    • Low profile, QFN (12-pin, 2 mm x 2 mm) package (MSL1, 260ºC per JEDEC J-STD-020)

Images & Diagrams


    • Min. VIN (V)
    • 2.7
    • Max. VIN (V)
    • 6.0
    • Min. VOUT (V)
    • 0.6
    • Max. VOUT (V)
    • 3.3
    • IOUT (mA)
    • 3500
    • fOSC (kHz)
    • 1200
    • Typ. IQ (μA)
    • 40
    • Package
    • QFN, 12L
    • Package (mm)
    • 2.0 x 2.0 x 0.85

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