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.


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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