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TD8655

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Techcode Semicon DC-DC Converters, QFN-20-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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TD8655

Techcode Semicon · DC-DC Converters · QFN-20-EP(4x4)

TD8655 from Techcode Semicon, in a QFN-20-EP(4x4). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 BST power_out Internal high-side driver power bias, typically 5.4V above VIN, with a typical 0.1uF capacitor connected between BST and SW.
2 VIN power_in Supply input, recommended 9V to 40V with absolute maximum rating of -0.3 to +43V.
3 ISENSE input Input current sense; absolute maximum rating ISENSE to VIN is -0.3 to +0.3 V.
4 COMP passive Error amplifier output where the converter stability compensation network is placed; absolute maximum rating to GND is -0.3 to +6 V.
5 FREQ input Switching frequency setting: a 120k to 30k ohm resistor to GND sets FSW=12000k/RF, and a floating pin gives 200kHz.
6 FB input Feedback input referenced to 1.20V (VFB), set by a resistor divider between VOUT and GND; absolute maximum rating -0.3 to +6 V.
7 EN input On/off control pin; electrical characteristics are specified with EN=3V.
8 ISET input Sets the output constant-current level, with VISET = 1.2V x (R18/(R18+R19)); absolute maximum rating -0.3 to +6 V.
9 COUT1 input Current limit of the 1st output; threshold voltage is 108mV across the sense resistor RCS1 (IOC = 108mV/RCS).
10 COUT2 input Current limit of the 2nd output; threshold voltage is 108mV across the sense resistor RCS2 (IOC = 108mV/RCS).
11 COUT3 input Current limit of the 3rd output; threshold voltage is 108mV across the sense resistor RCS3 (IOC = 108mV/RCS).
12 COUT4 input Current limit of the 4th output; threshold voltage is 108mV across the sense resistor RCS4 (IOC = 108mV/RCS); absolute maximum rating to GND is -0.3 to +0.3 V.
13 CS34 input Pull low to disable the COUT3/COUT4 constant-current function, and high to enable it.
14 SS passive Soft-start pin; a capacitor is connected between this pin and GND (typical soft-start time 10 ms with CSS = 0.1uF).
15 TS passive Test pin; the datasheet gives no functional description or connection requirement.
16 GND power_in Ground pin.
17 LSD output Low-side driver output for the external low-side power NMOS in the synchronous configuration.
18 VDD power_out Internal 5.4V power supply; a 1uF (or more) capacitor is connected between this pin and GND.
19 SW passive Inductor terminal (switch node); absolute maximum rating SW to GND is -0.3 to VIN+0.6 V.
20 HSD output High-side driver output for the external high-side power NMOS in the synchronous configuration.
21 EP passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer Techcode Semicon
Package QFN-20-EP(4x4)
Category Power Management (PMIC)
Pins 21

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
VIN Supply Voltage VIN 9 40 V 4
IIN Supply Input Current IIN 0.5 1.5 3 mA EN=3V, Vout=5V,No load 4
VIN UVLO Turn ON VUP 8.2 8.5 8.9 V VIN Rising 4
Feedback voltage VFB 1.176 1.2 1.224 V VEN=3V 4
Feedback voltage Tolerance -2 2 % 4
Switch frequency FSW 170 200 230 KHz RFREQ=60Kohm 4
Duty cycle D 95 % 4
OCP threshold VTOCP 100 108 116 mV 4
ISNESE to VIN -0.3 0.3 V 3
VIN Supply Input Voltage VIN -0.3 43 V 3
BS to SW -0.3 6 V 3
SW to GND -0.3 V 3
BS to GND -0.3 V 3
VFB,ISET,COMP,LSD,FREQ,SS CS34,TS to GND -0.3 6 V 3
COUT1-4 to GND -0.3 0.3 V 3
Thermal Resistance from Junction to ambient θJA 40 ºC/W 3
VIN Supply Voltage VIN 9 40 V 4
Output voltage range VOUT 1.2 28 V 4
Output current range IOUT 20 A 4
Operating Temperature -40 85 ºC 4
Storage Temperature Range TSTG -60 150 ºC 4
Maximum Lead Soldering Temperature TSDR 260 ºC 10 Seconds 4

CAD (KiCad official)

  • Symbol: TD8655
  • Footprint: Package_DFN_QFN:QFN-20-1EP_4x4mm_P0.5mm_EP2.5x2.5mm
  • 3D model: QFN-20-EP(4x4) (KiCad packages3D, STEP)
  • 3D model files: td8655-etched.step / td8655-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); td8655.step / td8655.glb are the bare package body.

Provenance

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

  • Datasheet: Techcode Semicon datasheet (12 pp, sha256 85d02fd146ba7500, retrieved 2026-10-20, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF