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

Please note: SKY87203 is being discontinued and is not recommended for new designs.

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.


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
PackageQFN, 12L
Package (mm)2.0 x 2.0 x 0.85


  • 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)

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