KB6880 PWM Buck Controller for Innosilicon A4+ A6 Hashboard

KB6880 PWM Buck Controller | SOP-14 IC for Innosilicon A4+, A6, and Dragonmint T1 Hash Boards

The KB6880 is a PWM buck controller IC in the SOP-14 through-mount package — the chip that drives the buck-converter switching stages feeding hashing ASIC core voltage rails on the Innosilicon A4+, Innosilicon A6, and Halong Mining / Innosilicon Dragonmint T1 hashboards. When the PWM controller fails, the buck-converter stops switching, the core-voltage rail collapses, and the downstream ASIC chips drop offline immediately. Replacement is a SOP-14-class SMD rework job — straightforward on a hot-air station with proper flux.

The KB6880 is the SOP-14 PWM controller used across multiple legacy Innosilicon-family hashboards from the 2017-2019 mining generation. The A4+ (Scrypt LTC/DOGE), A6 (X11 Dash), and Dragonmint T1 (SHA-256 BTC) all share the same buck-converter controller IC, making this a single-fix part for a broad range of repair work.

When to Replace the KB6880 on a Hash Board

• Hashboard core voltage rail is dead — buck-converter stage not switching; downstream chips report zero or stuck values.
• PWM switching node waveform absent — scope-probe the buck SW pin; no clean square wave means the controller is dead or its inputs are missing.
• Visible damage on the SOP-14 footprint — burnt or cracked package, lifted pins.
• Hashboard intermittent crashes after thermal warm-up — failing controller with degraded internal reference.
• Repeated rail-voltage instability reported in the miner controller logs.

Specs and Technical Features

• PWM buck-converter controller IC — drives an external MOSFET in a buck topology.
• SOP-14 package — through-mount 14-pin SMD, standard chip-rework-friendly footprint.
• Compatible hashboards: Innosilicon A4+, Innosilicon A6, Dragonmint T1.
• Power management: efficient regulation for hashing-ASIC core supply.
• Direct replacement for failed PWM controllers — restores buck-converter operation.
• Standard hashboard-repair component — pair with a 1-2A SOP-14 footprint analysis when ordering in volume.

KB6880 PWM Buck Controller Specifications

FAQ — KB6880 PWM Buck Controller

Q: How do I confirm the KB6880 is the failed part?
A: (1) Probe the buck-converter SW (switching) pin with a 100MHz scope — a healthy KB6880 produces a clean PWM square wave at the buck operating frequency; (2) Check the VCC and feedback pins for correct DC bias; (3) Use a multimeter in diode-test mode across the IC's supply pins to check for shorts. Dead controller = no switching + correct VCC = replace.

Q: Can I substitute another SOP-14 PWM buck controller?
A: Possibly, but verify three things: (1) pinout (every PWM controller family has different pin assignments — wrong pinout = burned out replacement immediately); (2) operating frequency range matches the hashboard's external L-C filter design; (3) feedback voltage reference matches the rail target. The KB6880's exact pinout is the safe match; substitutes need careful schematic verification.

Q: What's the rework profile for SOP-14?
A: Standard SOP-14 SMD rework — flux paste, preheat the board to 100°C, hot-air gun at 320-340°C with controlled airflow, lift with tweezers. Place fresh part with pin-1 orientation matching the silk-mark; reflow. Clean residue with IPA.

Q: Does the KB6880 fit Innosilicon T2 / T3 / T4 hashboards?
A: No — newer Innosilicon generations switched to different PWM controllers. The KB6880 is specifically for the A4+ / A6 / T1 generation (2017-2019 production). Newer boards use different chips with different footprints.

Q: Bulk pricing for repair shops?
A: Yes — email contact@lys-sz.com for tray-quantity pricing.

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Innosilicon A4+ / A6 / Dragonmint T1 repair benches stocking KB6880 PWM controllers in volume? Email contact@lys-sz.com for bulk pricing on Innosilicon hashboard repair parts. Worldwide shipping from our Shenzhen warehouse.