component
LGS4056HEP-4.35
Public Made by Adomby adom
Legend Si Battery Management, 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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Contents
README
markdownLGS4056HEP-4.35
Legend Si · Battery Management · ESOP-8
LGS4056HEP-4.35 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 | TEMP | input | Battery temperature detection input connected to the battery NTC; charging is suspended if the voltage is below 45% or above 80% of the input voltage, and the function is disabled when the pin is grounded or floating. |
| 2 | PROG | passive | Constant-current charge setting pin; a 1% resistor to ground sets the charge current as 1000/R_PROG (A, R in kΩ) above 300 mA or 900/R_PROG below 300 mA, e.g. 1K gives 1 A and 9K gives 0.1 A, and the pin voltage can be used to monitor charge current. |
| 3 | GND | power_in | Chip ground, to be connected to the PCB ground plane and the exposed pad. |
| 4 | VCC | power_in | Power input pin connected to the supply positive terminal; bypass VCC to GND with at least 10 µF effective-value ceramic capacitor placed as close as possible to the pins. |
| 5 | BAT | power_out | Battery charging output; connect to the battery positive terminal and place at least 10 µF effective-value ceramic capacitor to ground. |
| 6 | DONE | output | Open-drain full-charge indicator that pulls low when the battery is full to turn on the LED; connect to the LED cathode, or ground it if the indicator is not used. |
| 7 | CHRG | output | Open-drain charge indicator that pulls low while charging to turn on the LED; connect to the LED cathode, or ground it if the indicator is not used. |
| 8 | CE | input | Enable input; high level enables charging and low level turns charging off, driven by VCC or an MCU. |
| 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 (PMIC) |
| 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 |
|---|---|---|---|---|---|---|---|
| Pin to GND Voltage (VCC, CHRG, DONE, CE) | -0.3 | 28 | V | 3 | |||
| Pin to GND Voltage (BAT, TEMP, PROG) | -0.3 | 6 | V | 3 | |||
| Storage temperature | -65 | 150 | ℃ | 3 | |||
| Operating temperature | -40 | 125 | ℃ | 3 | |||
| ESD Rated Value (HBM) | -2000 | 2000 | V | 3 | |||
| ESD Rated Value (CDM) | -1000 | 1000 | V | 3 | |||
| Input Voltage Range | 4 | 24 | V | surge voltage up to 28V | 1 | ||
| Junction Temperature Range | -40 | 85 | ℃ | 1 | |||
| VCC Operation Voltage | 5 | V | 4 | ||||
| Trickle charge (TC) threshold voltage | VTC | 2.65 | 2.9 | 3.15 | V | Less than this threshold | 4 |
| Short circuit charging (SC) current (percent of ICC) | ISHORT | 5 | 7 | % | VBAT<VSHORT | 4 | |
| Trickle charging (TC) current (percent of ICC) | ITC | 10 | 14 | % | VSHORT<VBAT<VPRE | 4 | |
| VCC Threshold Voltage (rising) | 4 | V | VBAT=3V, EN=1 | 4 | |||
| VCC Threshold Voltage (falling) | 3.9 | V | VBAT=3V, EN=1 | 4 | |||
| Input Overvoltage Protection | VOVP | 6.5 | V | 4 | |||
| VCC Quiescent Current | IQ | 150 | μA | VCC=5V, EN=1, BAT Suspended | 4 | ||
| VCC Current (shutdown) | 40 | μA | VCC=5V, EN=0, BAT Suspended | 4 | |||
| BAT current | 1 | μA | VCC=0V, VBAT=4.0V | 4 | |||
| Short circuit charging (SC) threshold voltage | VSHORT | 0.6 | V | Less than this threshold | 4 | ||
| Short circuit charging (SC) hysteresis voltage | VSHORT_HYS | 0.1 | V | 4 | |||
| Trickle charging (TC) hysteresis voltage | VTC_HYS | 0.5 | V | 4 | |||
| Constant current charging (CC) current | ICC | 1000 | mA | VBAT=3.7V, RPROG=1K | 4 | ||
| Constant current charging (CC) current | ICC | 800 | mA | VBAT=3.7V, RPROG=1.2K | 4 | ||
| Constant current charging (CC) current | ICC | 500 | mA | VBAT=3.7V, RPROG=2K | 4 | ||
| Constant current charging (CC) current | ICC | 100 | mA | VBAT=3.7V, RPROG=9K | 4 | ||
| Recharging threshold after full battery | VRECHRG | 95.7 | % VCV | 4 | |||
| PMOS RDS(ON) | RDS(ON) | 1200 | mΩ | 4 | |||
| CE high level input voltage | VCE | 1.37 | V | CE Rising | 4 | ||
| CE low level input voltage | VCE | 1.16 | V | CE Falling | 4 | ||
| Battery overheat NTC threshold (high) | VTEMP-H | 80 | % VCC | Greater than this threshold, turn off charging | 4 | ||
| Battery overheat NTC threshold (low) | VTEMP-L | 45 | % VCC | Less than this threshold, turn off charging | 4 | ||
| Over temperature protection | TOTP | 150 | ℃ | TJ | 4 | ||
| LED drive current (CHRG) | ICHRG | 5 | mA | 4 | |||
| LED drive current (DONE) | IDONE | 5 | mA | 4 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | copper | the IC is from the chip to the lead frame, and reaches the copper clad surface of the PCB through the heat | 8 |
CAD (KiCad official)
- Symbol:
LGS4056HEP-4.35 - Footprint:
Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm - 3D model: ESOP-8 (KiCad packages3D, STEP)
- 3D model files:
lgs4056hep-4-35-etched.step/lgs4056hep-4-35-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lgs4056hep-4-35.step/lgs4056hep-4-35.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Legend Si datasheet (16 pp, sha256
2091f3fed91bac84, retrieved 2026-10-17, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-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).