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TL494IMS

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by Ray

HGSEMI DC-DC Converters, QSOP-16. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Datasheet

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Contents

README

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TL494IMS

HGSEMI · DC-DC Converters · QSOP-16

TL494IMS from HGSEMI, in a QSOP-16. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 1IN+ input Error Amplifier 1 non-inverting input. Common-mode input range -0.3 V to Vcc-2 V.
2 1IN- input Error Amplifier 1 inverting input. Common-mode input range -0.3 V to Vcc-2 V.
3 FEEDBACK bidirectional PWM comparator feedback input. Output node of both error amplifiers (open-collector wired-OR) and input to the PWM comparator; typically driven from 0.5 V to 3.5 V.
4 DTC input Dead-time control input. Voltage from 0 V (max duty) to ~3.3 V (0% duty) sets minimum dead-time between output pulses; input bias current -2 µA to -10 µA.
5 CT passive Oscillator timing capacitor. Connect CT (0.47 nF to 10 µF) from this pin to GND to set the sawtooth frequency together with RT (f ≈ 1/(RT·CT)).
6 RT passive Oscillator timing resistor. Connect RT (1.8 kΩ to 500 kΩ) from this pin to GND; sets oscillator charging current for the sawtooth. Oscillator range 1 kHz to 200 kHz.
7 GND power_in Device ground / signal return.
8 C1 output Output transistor 1 collector. Open collector rated Vc ≤ 40 V, Ic ≤ 200 mA per transistor; Vce(sat) ≈ 1.1-1.3 V at 200 mA.
9 E1 output Output transistor 1 emitter. Ve(sat) ≈ 1.5-2.5 V at Ie = -200 mA in emitter-follower configuration.
10 E2 output Output transistor 2 emitter. Ve(sat) ≈ 1.5-2.5 V at Ie = -200 mA in emitter-follower configuration.
11 C2 output Output transistor 2 collector. Open collector rated Vc ≤ 40 V, Ic ≤ 200 mA per transistor; Vce(sat) ≈ 1.1-1.3 V at 200 mA.
12 VCC power_in Device supply voltage. Operating range 7 V to 40 V; typical Icc ≈ 6-10 mA at 15 V, 9-15 mA at 40 V.
13 OUTPUT_CTRL input Output-mode select. Tie to GND for parallel single-ended operation (both outputs in phase, up to 90% duty per output); tie to Vref (pin 14) for push-pull operation (outputs alternate, max 45% duty each). Input current Ioch 0.2-3.5 mA.
14 VREF power_out Internal 5 V reference output (4.75 V to 5.25 V, typ 5.0 V). Short-circuit current ~32 mA; supply up to 10 mA to external circuitry.
15 2IN- input Error Amplifier 2 inverting input. Common-mode input range -0.3 V to Vcc-2 V.
16 2IN+ input Error Amplifier 2 non-inverting input. Common-mode input range -0.3 V to Vcc-2 V.

Key specifications

Parameter Value
Manufacturer HGSEMI
Package QSOP-16
Category PMIC
Pins 16

Ordering variants

Same part, different packaging or reel option.

  • TL494CMS/TR
  • TL494IMS/TR
  • TL494CN
  • TL494IN
  • TL494CM/TR
  • TL494IM/TR
  • TL494CMT/TR
  • TL494IMT/TR

CAD (KiCad official)

  • Symbol: TL494IMS
  • Footprint: Package_SO:QSOP-16_3.9x4.9mm_P0.635mm
  • 3D model: QSOP-16 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: HGSEMI datasheet (12 pp, sha256 99e3d620b7c82bbd, retrieved 2026-08-17, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF