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LD5521DGL

Public Made by Adom

by adom

Leadtrend Tech AC-DC Controllers And Regulators, SOT-26. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LD5521DGL

Leadtrend Tech · AC-DC Controllers And Regulators · SOT-26

LD5521DGL from Leadtrend Tech, in a SOT-26. 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 GND power_in Ground reference pin for the controller.
2 COMP passive Output of the error amplifier for voltage compensation; open-loop voltage is 5.3V typical (5.0V to 5.6V), and a capacitor of 1nF to 10nF is required on this pin for stable operation.
3 FB input Auxiliary voltage sense for brown-in/brown-out, quasi-resonant detection and FB OVP; the FB OVP trip voltage is 3.5V typical (3.4V to 3.6V) and the absolute maximum rating is -0.3V to 6V.
4 CS input Current sense pin that senses the MOSFET current; maximum input voltage is 0.52V typical (0.49V to 0.55V), a CS capacitor of 47pF to 470pF is recommended, and the absolute maximum rating is -0.3V to 6V.
5 VCC power_in Supply voltage pin with recommended range 8.0V to 26.5V and absolute maximum 30V; VCC OVP trips at 28.5V typical and a 3.3uF to 10uF capacitor is recommended.
6 OUT output Gate drive output that drives the external power MOSFET with 250mA/-500mA driving capability, with absolute maximum range -0.3V to VCC.

Key specifications

Parameter Value
Manufacturer Leadtrend Tech
Package SOT-26
Category Power Management (PMIC)
Pins 6

Electrical characteristics

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

Parameter Symbol Min Typ Max Unit Conditions Page
Supply Voltage VCC VCC -0.3 30 V 4
OUT pin voltage -0.3 V 4
COMP, FB, CS pin voltage -0.3 6 V 4
Maximum Junction Temperature 150 C 4
Storage Temperature Range -65 150 C 4
Package Thermal Resistance (SOT-26) JA 200 C/W 4
Power Dissipation (SOT-26) 200 mW Ambient Temperature = 85C 4
Lead temperature 260 C Soldering, 10sec 4
ESD Voltage Protection, Human Body Model 2.5 KV Human Body Model 4
ESD Voltage Protection, Machine Model 250 V Machine Model 4
Operating Junction Temperature -40 125 C 4
Supply VCC Voltage VCC 8 26.5 V 4
VCC Capacitor 3.3 10 µF 4
Start-up resistor Value (AC Side, Half Wave) 400 2 K/M 4
Comp Pin Capacitor 1 10 nF 4
CS Pin Capacitor Value 47 470 pF 4
Startup Current ICC_ST 5 µA 5
Operating Current ICC_OP1 0.5 mA VCOMP=0V, OUT=1nF 5
Operating Current ICC_OP2 1.5 mA VCOMP=3V, OUT=1nF 5
Operating Current (OLP Auto) ICC_OPA2 0.55 mA OLP Auto 5
Holding Current ICC_OPL2 500 µA VCC=10V 5
UVLO(OFF) VCC_OFF 6.5 7.5 8.5 V 5
UVLO(ON) VCC_ON 12.5 13.5 14.5 V 5
Latch-Off Release Voltage PDR 3.6 4.6 5.6 V 5
VCC OVP Level VCC_OVP 27 28.5 29.5 V 5
Short Circuit Current ICOMP 0.1 0.125 0.15 mA VCOMP=0V 5
Open Loop Voltage VCOMP_OPEN 5 5.3 5.6 V COMP pin open 5
Maximum Input Voltage (CS) VCS_LIMIT 0.49 0.52 0.55 V 5
Brown In Trip Level IBNI 85 95 101.5 µA 5
Brown Out Trip Level IBNO 79 85 93.5 µA 5
Brown Out De-bounce Time TDB_BNO 46 60 64 ms VCOMP=3V 5
QRD OVP Trip voltage Level VFB_OVP 3.4 3.5 3.6 V 6
Frequency Swapping FSW_MOD -12 12 % 6
Green Mode Frequency FSW_GREEN 25 27 kHz 6
Temp. Stability FSW_TS 3 5 % 6
Output High Level VOH 8 15 V VCC=15V, IO=20mA 6
Rising Time Tr 200 350 ns VCC=15V CL=1000pF 6
Falling Time Tf 80 150 ns VCC=15V CL =1000pF 6
OLP Trip Level VOLP 4.3 4.5 4.7 V 6

CAD (KiCad official)

  • Symbol: LD5521DGL
  • Footprint: Package_TO_SOT_SMD:SOT-23-6
  • 3D model: SOT-26 (KiCad packages3D, STEP)
  • 3D model files: ld5521dgl-etched.step / ld5521dgl-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ld5521dgl.step / ld5521dgl.glb are the bare package body.

Provenance

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

  • Datasheet: Leadtrend Tech datasheet (13 pp, sha256 cff90ee1513ad733, retrieved 2026-10-17, 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