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IS32LT3958-ZLA3-TR

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ISSI Integrated Silicon Solution LED Drivers, eTSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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IS32LT3958-ZLA3-TR

ISSI Integrated Silicon Solution · LED Drivers · eTSSOP-20

IS32LT3958-ZLA3-TR from ISSI Integrated Silicon Solution, in a eTSSOP-20. 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 VCC power_in The power supply pin.
2 PWM/EN input External PWM dimming and enable pin: pull high to enable and low to disable the IC, do not let it float, and connect it to VCC via a resistor (recommended 10kΩ) if not used.
3 FAULTB output Open-drain active-low fault reporting pin, with a recommended 47kΩ pull-up resistor to the required logic level voltage.
4 FRQSS passive Spread-spectrum frequency setting pin: a capacitor to ground sets the dither frequency, and connecting it directly to ground disables the function.
5 COMP passive Loop compensation pin.
6 RT/SYNC input An external resistor to ground sets the operating frequency, and an external clock applied to this pin can synchronize two or more ICs.
7 ICTRL input Analog dimming pin with a range of 0.06V to 2V (zero current below 0.06V, full current between 2V and 5V), which must not float and should be decoupled with a 10nF X7R capacitor placed close to the pin.
8 ADJR input Analog dimming pin with identical function to ICTRL.
9 SS passive Soft-start time programming pin: a capacitor from this pin to GND sets the soft-start time, and the pin must not float.
10 PWMDC input Internal PWM generator duty-cycle setting pin: 0V to 3V enables the internal PWM generator and sets the duty cycle, 3V to 5V disables it, and the pin must never float or be connected directly to VDD.
11 PWMFR passive Internal PWM generator frequency pin: a resistor from this pin to GND sets the internal PWM frequency (100Hz to 1kHz).
12 IMON output Output current reporting pin with VIMON = 8 × (VISP − VISN), internally clamped to VIMON_CLP (typical 3.35V), and left floating if unused.
13 OV input Output voltage detection pin: a resistor divider from the output to GND sets the output overvoltage and undervoltage protection thresholds.
14 ISN input LED current sense amplifier negative input.
15 ISP input LED current sense amplifier positive input.
16 GND power_in Ground pin; the exposed thermal pad must be soldered to a large GND copper plane.
17 CS input External NMOS switch current sense for control loop and overcurrent protection, connected through a resistor to ground.
18 DIMOUT output Buffered PWM signal driving the LED string disconnect NMOS, with its high level set by the internal VDD LDO, also used for fault protection, and left floating if not used.
19 GATE output Gate drive to the external power NMOS, switching between VDD and GND.
20 VDD power_out Internal LDO output that needs a low-ESR 1µF capacitor placed close to the pin, and is not meant to power any external circuit.
21 EP passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer ISSI Integrated Silicon Solution
Package eTSSOP-20
Category LED Drivers
Pins 21

CAD (KiCad official)

  • Symbol: IS32LT3958-ZLA3-TR
  • Footprint: Package_SO:ETSSOP-20-1EP_4.4x6.5mm_P0.65mm_EP3x4.2mm
  • 3D model: eTSSOP-20 (KiCad packages3D, STEP)
  • 3D model files: is32lt3958-zla3-tr-etched.step / is32lt3958-zla3-tr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); is32lt3958-zla3-tr.step / is32lt3958-zla3-tr.glb are the bare package body.

Provenance

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

  • Datasheet: ISSI Integrated Silicon Solution datasheet (35 pp, sha256 66f84e58b57e6565, retrieved 2026-10-09, 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