Skip to main content
Texas Instruments UC2844AD8 — Analog & Data Acquisition
Texas Instruments

UC2844AD8 PWM Controller, Boost/Buck/Flyback, 500kHz, SOIC-8

MPNUC2844AD8
End of Life

UC2844AD8 current-mode PWM controller, step-up/step-down/step-up-step-down function, boost/buck/flyback/forward topology, 48% max duty cycle, up to 500 kHz switching, transistor driver output, 10–30 V supply, -40 to 85 °C, 8-SOIC package.

$1.44Ref. price · indicative, final on quote
UC2844AD8 datasheet
Packaging8-SOIC (0.154", 3.90mm Width)
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
  • PayPal buyer protectionPay by T/T, PayPal or Payoneer — card payments covered end to end.

Specifications

UC2844AD8 Technical Specifications
ParameterValue
Output typeTransistor Driver
Mounting typeSurface Mount
Voltage - supply (Vcc (Vdd))10V ~ 30V
FrequencyUp to 500kHz
Number of outputs1
Output phases1
Duty cycle48%
Operating temperature-40°C ~ 85°C (TA)
PackageTube
FunctionStep-Up, Step-Down, Step-Up/Step-Down
TopologyBoost, Buck, Flyback, Forward
Clock syncNo
Case8-SOIC (0.154\", 3.90mm Width)
Control featuresFrequency Control
Output configurationPositive, Isolation Capable
Synchronous rectifierNo

Product details

Current-mode PWM controller for single-ended topologies

The UC2844AD8: Current-mode PWM controller for boost, buck, flyback, and forward topologies with a single transistor-driver output. The 48% maximum duty cycle keeps the transformer reset in flyback and forward stages. Switching frequency reaches up to 500 kHz. Supply range spans 10 V to 30 V. Operating temperature range -40°C to 85°C.

Package and mounting

Housed in an 8-SOIC package (0.154" width, 3.90 mm body), surface-mount on a standard SOIC-8 footprint. The tube shipment is typical for prototype and low-volume builds; production reels are available through the supply chain. No heatsink tab — thermal management relies on board copper and airflow.

Control features and output configuration

Frequency control is the only on-chip control feature; there is no clock sync input, no enable pin, and no soft-start internal. Output configuration is positive, isolation capable — the driver can feed a pulse transformer or optocoupler for isolated feedback loops. No synchronous rectifier drive, so the secondary side needs its own controller for high-efficiency rectification.

Sourcing and lifecycle

For new designs, this part remains a safe BOM line without near-term discontinuation risk.

Frequently asked questions

Can UC2844AD8 be used in a boost converter?

Yes. The device supports boost topology as one of its listed topologies (boost, buck, flyback, forward). The 48% max duty cycle limits the step-up ratio in a single stage; a coupled-inductor or multi-stage design may be needed for high conversion ratios.

Can UC2844AD8 be used for flyback converter?

Yes — flyback is one of the supported topologies. The 48% duty ceiling ensures the flyback transformer resets each cycle, which is standard for single-ended flyback designs. The transistor driver output can directly drive a power MOSFET or IGBT with appropriate gate drive circuitry.

What is the closest functional second-source to UC2844AD8?

A close functional peer is the UCC2806DWTR, also a current-mode PWM controller with boost/flyback/forward capability and a 50% duty cycle. The UCC2806 offers two outputs and includes synchronous rectifier drive, but it lacks the 500 kHz ceiling (47 kHz max) and does not support buck topology. It is not a pin-for-pin replacement — the 8-SOIC footprint matches, but the control logic and pinout differ. Verify compatibility against your schematic before substituting.