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td1660

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by Ray

Techcode Semicon DC-DC Converters, ESOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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TD1660

Techcode Semicon · DC-DC Converters · ESOP-8

TD1660 from Techcode Semicon, in a ESOP-8. 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 SW output Switch node. Output from the internal high-side power MOSFET (RDS(ON) typ 250mΩ). Requires a low-VF Schottky rectifier to ground placed close to the pin to reduce switching spikes. Absolute max: -0.5V to VIN+0.5V.
2 EN input Enable input (positive logic). Pull above rising threshold (typ 1.5V, spec 1.3V-2.2V) or leave floating to enable; pull below falling threshold (~1.2V) to shut down. 200mV hysteresis. Absolute max: -0.3V to +5V.
3 COMP output Compensation node. Output of the internal Gm error amplifier; connect an external series R-C (and optional second cap) to set loop pole/zero. COMP is clamped internally between 0.9V and 2.0V; do not drive above 2.6V.
4 FB input Feedback input to the error amplifier. Connect a resistive divider from VOUT to GND; the divider node is compared to the internal 0.8V reference (0.780V-0.820V) to set the regulated output voltage (0.8V to 52V).
5 GND power_in Ground return. Also the exposed thermal pad on the ESOP-8 package - connect to the GND plane for optimal thermal performance. Route close to the output capacitor and away from high-current switch paths.
6 FREQ input Switching-frequency program input. Connect a resistor RFREQ from this pin to GND to set the oscillator frequency, per RFREQ(kΩ) = 100000/fS(kHz) − 5 (e.g. 195kΩ → 500kHz; 150kΩ → ~700kHz). Programmable up to 1MHz.
7 VIN power_in Input supply, 9V to 60V (abs max 60V). Powers the internal control circuitry, bootstrap regulator, and high-side power MOSFET. UVLO rising threshold typ 7.2V (0.5V hysteresis). Place a decoupling capacitor to GND close to this pin.
8 BST power_in Bootstrap. Positive supply for the internal floating high-side MOSFET driver. Connect a bypass capacitor (typ 0.1μF) between BST and SW; internally regulated to ~5V above SW. BST-to-SW abs max +5V.

Key specifications

Parameter Value
Manufacturer Techcode Semicon
Package ESOP-8
Category PMIC
Pins 8

Ordering variants

  • TD1660M
  • TD1660MR

CAD (KiCad official)

  • Symbol: TD1660
  • Footprint: Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm
  • 3D model: ESOP-8 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: Techcode Semicon datasheet (None pp, sha256 67a24a62ca900eb4, retrieved 2026-08-17, tier: lcsc)
  • 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

Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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