SKY87609

28 V Step-Down DC-DC Controller with Optional Synchronous MOSFET Driver

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

The SKY87609 is a step-down DC-DC controller that operates over a wide 4.5 V to 28 V input voltage range and regulates output voltage as low as 0.9 V while supplying up to 6 A to the output. The 450 kHz switching frequency allows an efficient step-down regulator design.

The SKY87609 uses an adjustable output voltage that can be set from 0.9 V to 80% of the input voltage by an external resistive voltage divider. Internal soft-start prevents excessive inrush current without requiring an external capacitor.

The SKY87609 includes input under-voltage and over-current protection to prevent damage in the event of a fault. Thermal overload protection prevents damage to the SKY87609 or circuit board when operating beyond its thermal capability.

The SKY87609 is available in a small 12-pin 2.85 mm × 3.00 mm TSOPJW package.

Data Sheets
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Specifications

Min. VIN (V)4.5
Max. VIN (V)28
Min. VOUT (V)0.9
Max. VOUT (V)0.8*VIN
IOUT (mA)6000
fOSC (kHz)450
Typ. IQ (μA)1600
PackageTSOPJW, 12L
Package (mm)2.85 x 3.0 x 1.0

Features

  • 4.5 V to 28 V input voltage
  • Controller with internal 10 Ω refresh MOSFET
  • Up to 6 A load current
  • Optional low-side MOSFET driver
  • Adjustable output voltage (0.9 V to 0.8 × VIN)
  • Fixed 450 kHz switching frequency
  • 4 ms soft-start period
  • External compensation
  • Less than 1 μA shutdown current
  • Up to 97% efficiency
  • Current limit protection
  • Compact TSOPJW (12-pin, 2.85 mm × 3.00 mm) package (MSL1, 260 °C per JEDEC-J-STD-020)

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