component
LGS5504
Public Made by Adomby adom
Legend-Si Battery Management ICs, ESOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownLGS5504
Legend-Si · Battery Management ICs · ESOP-8
LGS5504 from Legend-Si, in a ESOP-8. 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 | LED | output | Charge status indicator output for an LED (680R series resistor suggested in the application notes), with the LED blinking at 1Hz in one of the states. |
| 2 | BST | passive | Bootstrap pin; connect a 100nF capacitor (CBST) between BST and SW, with a -0.3V to 6V limit relative to SW. |
| 3 | SW | passive | Switching node of the boost converter, connected to the inductor (2.2uH) and the CBST capacitor, with a 5A current rating. |
| 4 | VOUT | passive | Boost converter output; decouple to GND with a capacitor placed close to the pin, with absolute maximum -0.3V to 28V. |
| 5 | BAT | bidirectional | Battery connection; the charger regulates 16.8V constant-voltage on the LGS5504, with absolute maximum -0.3V to 28V. |
| 6 | VCC | power_out | Internal LDO output (10.6V to 11.6V on the LGS5504) that biases the NTC network and needs a decoupling capacitor to GND, with absolute maximum -0.3V to 6V per the table. |
| 7 | VIN | power_in | Power input (3.0V to 12.3V operating on the LGS5504), with absolute maximum -0.3V to 28V and a 10uF input capacitor. |
| 8 | NTC | input | Battery temperature sense input; connect an NTC thermistor with resistor divider to VCC (R1=28K, R2=10K for the 5V USB option). |
| 9 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Legend-Si |
| Package | ESOP-8 |
| Category | Power Management |
| Pins | 9 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Input voltage range LGS5504 | VVIN | 3 | 12.3 | V | LGS5504 | 5 | |
| Constant voltage charge output | VCV | 16.632 | 16.8 | 16.968 | V | LGS5504 | 5 |
| Recharge threshold | ΔVRCH | 16.2 | 16.4 | 16.6 | V | LGS5504 | 5 |
| VCC voltage | VCC | 10.6 | 11.2 | 11.6 | V | LGS5504 | 5 |
| UVLO threshold (rising) | VUVLO | 2.7 | 2.8 | 3 | V | VVIN | 5 |
| UVLO threshold (falling) | VUVLO | 2.5 | 2.6 | 2.8 | V | VVIN | 5 |
| UVLO hysteresis | ΔVUVLO | 50 | 150 | 300 | mV | 5 | |
| Input OVP threshold LGS5504 | VOVP | 12.8 | V | VVIN, LGS5504 | 5 | ||
| Input OVP threshold LGS5504 (second) | VOVP | 12.5 | V | VVIN, LGS5504 | 5 | ||
| Input OVP hysteresis | ΔVOVP | 200 | 350 | mV | 5 | ||
| BAT leakage current LGS5504 | IBAT | 35 | 40 | uA | VIN=0,BAT=16.8V | 5 | |
| VIN current | IVIN | 20 | 26 | 30 | uA | EN=0 | 5 |
| Switching frequency | ƒSW | 650 | kHz | Boost | 5 | ||
| Main N-FET RDS(ON) | RNFET_M | 41 | mΩ | Boost | 5 | ||
| Rectified N-FET RDS(ON) | RNFET_R | 26 | mΩ | Boost | 5 | ||
| Blocking N-FET RDS(ON) | RNFET_B | 53 | mΩ | 5 | |||
| Trickle charge threshold | VTC | 1.6 | 2 | 2.4 | V | 6 | |
| Constant current charge current | ICC | 1500 | mA | CC | 6 | ||
| Trickle charge current | ITC | 9 | 12 | 15 | % ICC | TC | 6 |
| Short charge current | ISC | 3 | 6 | 9 | % ICC | SC | 6 |
| Termination current | ITERM | 6 | 12 | 18 | % ICC | CV | 6 |
| Output OVP threshold | VOVP | 120 | % VCV | Output voltage OVP threshold | 6 | ||
| Output OVP threshold (second) | VOVP | 110 | % VCV | Output voltage OVP threshold | 6 | ||
| NTC OTP threshold falling | OTP | 22 | 25 | 27 | % VCC | Falling edge | 6 |
| NTC OTP threshold rising | OTP | 25 | 27 | 30 | % VCC | Rising edge | 6 |
| NTC threshold hysteresis | 2 | 2.6 | 3 | % VCC | 6 | ||
| Thermal regulation temperature | TREG | 110 | °C | 6 | |||
| Thermal shutdown | OTP | 160 | °C | 6 | |||
| Thermal shutdown hysteresis | OTPHYS | 30 | °C | 6 | |||
| VIN to GND | -0.3 | 28 | V | VIN to GND | 4 | ||
| BAT, VOUT, SW to GND | -0.3 | 28 | V | BAT,VOUT,SW to GND | 4 | ||
| NTC, VCC to GND | -0.3 | 6 | V | NTC,VCC to GND | 4 | ||
| BST to SW | -0.3 | 6 | V | SW to BST | 4 | ||
| Temperature range (assumed storage) | -65 | 150 | °C | 4 | |||
| Temperature range (assumed junction) | -40 | 125 | °C | 4 | |||
| ESD HBM | -2 | 2 | kV | HBM | 4 | ||
| ESD CDM | -500 | 500 | V | CDM | 4 |
CAD (KiCad official)
- Symbol:
LGS5504 - Footprint:
Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm - 3D model: ESOP-8 (KiCad packages3D, STEP)
- 3D model files:
lgs5504-etched.step/lgs5504-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lgs5504.step/lgs5504.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Legend-Si datasheet (16 pp, sha256
4a315848881349be, retrieved 2026-10-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-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).