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Texas Instruments UC3844ADTRG4 — Power Management (PMIC / Gate Driver)

UC3844ADTRG4 Current-Mode PWM Controller, Up to 500 kHz

MPNUC3844ADTRG4
End of Life

Texas Instruments UC3844ADTRG4 current-mode PWM controller, 14-SOIC surface-mount package, 48% max duty cycle, up to 500 kHz switching, 10 V to 30 V supply.

Texas Instruments UC3844ADTRG4 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

UC3844ADTRG4 specifications
ParameterValue
Output typeTransistor Driver
MountingSurface Mount
Voltage - supply (Vcc (Vdd))10V ~ 30V
Frequency - switchingUp to 500kHz
I/O channels1
Output phases1
Duty cycle48%
Operating temperature0°C~70°C(TA)
PackageTape & Reel (TR)
FunctionStep-Up, Step-Down, Step-Up/Step-Down
TopologyBoost, Buck, Flyback, Forward
Clock syncNo
Case14-SOIC (0.154\", 3.90mm Width)
Control featuresFrequency Control
Output configurationPositive, Isolation Capable
Synchronous rectifierNo

Product details

48 % duty-cycle ceiling — no shoot-through worry

The UC3844ADTRG4 is a current-mode PWM controller from Texas Instruments that tops out at a 48% duty cycle, which means the output transistor driver is forced off for more than half the period. In a flyback or forward converter that 48% cap prevents any chance of core saturation from overlapping drive pulses — the off-time is baked in, not left to the loop. It switches up to 500 kHz.

No last-time-buy notice, no end-of-life letter on file. Sourced to order against a BOM quantity.

Frequently asked questions

What is the maximum duty cycle of UC3844ADTRG4?

48%. That is the hard limit — the output driver is forced off for more than half the period, which prevents overlapping drive pulses in push-pull or half-bridge topologies.