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LD5523NGL-M

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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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LD5523NGL-M

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

LD5523NGL-M 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 pin of the controller, the reference for all pins (the datasheet gives no further limit for this pin).
2 COMP output Output of the error amplifier for voltage compensation, which needs a 330 pF to 4700 pF X7R capacitor to filter switching noise, has an internal pull-high resistor, and turns off the gate output if left floating.
3 FB input Auxiliary voltage sense for brown-in/out, bulk-cap OVP, FB OVP (trip 3.3 V to 3.7 V), FB UVP (0.8 V) and quasi-resonant detection, with an absolute maximum of -0.3 V to 7 V.
4 CS input Current sense input for the MOSFET current with a 0.5 V (0.48 V to 0.52 V) maximum input voltage and 275 ns leading-edge blanking, which also serves as the external OTP input and requires a 47 pF to 470 pF capacitor.
5 VCC power_in Supply voltage pin with a recommended operating range of 8.0 V to 26.5 V, an absolute maximum of 30 V, and an OVP threshold of 27 V to 29 V, which needs a 0.1 µF to 0.47 µF ceramic capacitor placed close to the pin.
6 OUT output Gate drive output that drives the external MOSFET with about 350 mA drive capability, a high clamp of 11.5 V at VCC = 18 V, and an absolute maximum of -0.3 V to VCC + 0.3 V.

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 pin) absolute maximum VCC -0.3 30 V 4
COMP pin voltage absolute maximum -0.3 12 V 4
FB, CS pin voltage absolute maximum -0.3 7 V 4
OUT pin voltage absolute maximum -0.3 V 4
Maximum Junction Temperature 150 C 4
Storage Temperature Range -65 150 C 4
Lead temperature (Soldering) 260 C Soldering, 10sec 4
ESD Voltage Protection, Human Body Model 2.5 KV 4
ESD Voltage Protection, Machine Model 250 V 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 AC side, half wave; printed as 400K to 2M 4
Comp Pin Capacitor (X7R type) 330 4700 pF X7R type 4
CS Pin Capacitor Value 47 470 pF 4
Startup Current ICC_ST 1 µA 5
Brown in (before first pulse)/ Brown out operating current ICC_OPA3 0.7 1.1 1.5 mA 5
UVLO(OFF) threshold VCC_OFF 6 7 8 V 5
UVLO(ON) threshold VCC_ON 15.5 16.5 17.5 V 5
VCC OVP Level VCC_OVP 27 28 29 V 5
Max. OCP Compensation Current IOCP_MAX 200 225 250 µA IFB=300µA 5
Maximum Input Voltage (CS pin) VCS_LIMIT 0.48 0.5 0.52 V 5
Brown In Trip Level IBNI 90 95 100 µA 5
FB OVP Trip voltage Level VFB_OVP 3.3 3.5 3.7 V 6
CS OTP Level VCS_OTP 0.48 0.5 0.52 V 6
CCM Frequency FCCM 60 65 70 kHz 6
Frequency Swapping FSW_MOD -8 8 % printed ±8 % 6
Green Mode Frequency FSW_GREEN 21 24 27 kHz 6
Temp. Stability FSW_TS 3 5 % 6
Output High Level VOH 9 14 V VCC =15V, Io=20mA 6
Operating Current (with 1nF load on OUT pin) ICC_OP1 0.285 mA VCOMP=0V, OUT=1nF 5
Operating Current (with 1nF load on OUT pin) ICC_OP2 2.4 mA VCOMP=1.7V, OUT=1nF, IFB=200µA 5
Auto current protection ICC_OPA1 0.6 mA 5
Short Circuit Current (COMP pin) ICOMP 0.116 mA VCOMP=0V 5
Open Loop Voltage VCOMP_OPEN 3.15 V 5
Min. OCP Compensation Current IOCP_MIN 71 µA IFB=100µA 5
Leading Edge Blanking Time TLEB 275 ns 5
Internal Slope Compensation VSLP_L 165 mV *ton>3s to DMAX (linearly increase) 5
Delay to Output TPD 80 ns 5
BNO Hysteresis IBNO_HYS 10 µA 5
Brown Out De-bounce Time TDB_BNO 75 ms VCOMP=1.7V 5
Bulk Cap OVP IBULK_OVP 418 µA 5
Bulk Cap OVP delay TFB_BOVP 500 ms 5
FB UVP Trip voltage Level VFB_UVP 0.8 V 6
QRD Trip Level IQRD 20 µA 6
CS OTP de-bounce time TCS_OTP 5.4 ms 6
Voltage Stability FSW_VS 1 % VCC =9V~24V 6
Maximum Duty DMAX 81 % 6
Output Low Level VOL 1 V VCC =15V, Io=20mA 6
Rising Time Tr 280 ns VCC =15V CL=1000pF 6
Falling Time Tf 30 ns VCC =15V CL=1000pF 6
Output High Clamp Level VO_CLAMP 11.5 V VCC =18V 6
Soft Start Time TSS 7 ms VCS_OFF from 0.2V to 0.5V 6
SDSP CS Pin Level VCS_SDSP 1.3 V Secondary diode short 6
OLP Trip Level VOLP 2.8 V 6
OLP delay time TD_OLP 210 ms After soft-start 6
On Chip OTP Level TINOTP 140 C 6
On Chip OTP Hysteresis TINOTP_HYS 12 C 6
Power Dissipation (SOT-26) 200 mW Ambient Temperature = 85C 4
Package Thermal Resistance (SOT-26, θJA) θJA 200 C/W 4

CAD (KiCad official)

  • Symbol: LD5523NGL-M
  • Footprint: Package_TO_SOT_SMD:SOT-23-6
  • 3D model: SOT-26 (KiCad packages3D, STEP)
  • 3D model files: ld5523ngl-m-etched.step / ld5523ngl-m-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ld5523ngl-m.step / ld5523ngl-m.glb are the bare package body.

Provenance

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

  • Datasheet: Leadtrend Tech datasheet (16 pp, sha256 8ef0ea772e39e056, retrieved 2026-10-18, 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