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WS4508E-5

Public Made by Adom

by adom

WILLSEMI(Will Semicon) Battery Management ICs, SOT-23-5L. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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WS4508E-5

WILLSEMI(Will Semicon) · Battery Management ICs · SOT-23-5L

WS4508E-5 from WILLSEMI(Will Semicon), in a SOT-23-5L. 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 CHGb output Open-drain charge status output that is pulled low while the battery is charging and forced high impedance when the charge cycle is completed or VCC is removed.
2 GND power_in Ground.
3 BAT power_out Charge current output that provides charge current to the battery and regulates the final float voltage to 4.2V.
4 VCC power_in Power supply input, with an absolute maximum of -0.3 to 8V.
5 PROG input Charge current setting, charge current monitor and shutdown pin, with IBAT = (1/RPROG)*1000, and the chip shuts down when the PROG pin is floating.

Key specifications

Parameter Value
Manufacturer WILLSEMI(Will Semicon)
Package SOT-23-5L
Category Power Management ICs
Pins 5

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 -0.3 8 V 3
PROG Voltage VPROG -0.3 V -0.3 to VCC 3
BAT Voltage VBAT -0.3 8 V 3
CHGb Voltage VCHGb -0.3 V -0.3 to VCC 3
BAT Pin Current IBAT 600 mA 3
Power Dissipation Note1 Pd 0.5 W 1 in sq pad, 2oz Cu 3
Power Dissipation Note2 Pd 0.3 W minimum recommended pad, 2oz Cu 3
Junction Temperature Tj 150 oC 3
Operation Temperature Top -45 85 oC 3
Storage Temperature Tsg -65 125 oC 3
Lead Temperature 260 oC Soldering 10s 3
Thermal Resistance Junction to Ambient Note1 RJA1 125 OC/W 1 in sq pad, 2oz Cu 3
Thermal Resistance Junction to Ambient Note2 RJA2 415 OC/W minimum recommended pad, 2oz Cu 3
Charge Mode Supply Current ISPLYCHRG 650 2000 uA RPROG=2kΩ 4
Charge Mode Supply Current ISPLYCHRG 240 2000 uA RPROG=10kΩ 4
Charge Mode Battery Current IBATCHRG 450 500 550 mA RPROG=2kΩ 4
Charge Mode Battery Current IBATCHRG 80 93 110 mA RPROG=10kΩ 4
PROG Pin Voltage VPROGCHRG 0.93 1 1.07 V RPROG=2kΩ 4
Standby Mode Supply Current ISPLYSTBY 140 500 uA Charge Terminated 4
Standby Mode Battery Current IBATSTBY 0 -2.5 -6 uA Charge Terminated 4
Shutdown Mode Supply Current ISPLYASD 20 45 90 uA VCC<VBAT 4
Shutdown Mode BAT Pin Current IBATASD -0.05 1 uA VCC<VBAT; printed ±0.05 ±1 4
UVLO Mode Supply Current ISPLYUVLO 20 45 90 uA Vcc<VUV 4
UVLO Mode BAT Pin Current IBATUVLO -0.05 1 uA Vcc<VUV; printed ±0.05 ±1 4
Shutdown Mode Supply Current ISPLYSHUT 20 45 70 uA Rprog not Connected 4
Manual Shutdown BAT Pin Current IBATMSD -0.05 1 uA Vprog=1.3V; printed ±0.05 ±1 4
Sleep Mode BAT Pin Current IBATSLEEP -0.05 1 uA Vcc=0V; printed ±0.05 ±1 4
Float Voltage VFLOAT 4.158 4.2 4.242 V 4
Trickle Charge Current ITRIKL 20 50 70 mA RPROG=2kΩ 4
Trickle Charge Voltage Threshold VTRIKL 2.8 2.9 3 V RPROG=10kΩ 4
Trickle Charge Voltage Hysteresis VTRIKL, HYS 100 mV RPROG=10kΩ 4
UVLO Threshold VUVLO 3.6 3.8 4 V From Vcc Low to High 4
UVLO Hysteresis VUVLO, HYS 250 mV 4
Manual Shutdown Threshold Voltage VMSD 1.2 V PROG Pin Rising 4
Manual Shutdown Threshold Voltage VMSD 1 1.3 V PROG Pin Falling 4
Vcc-VBAT Lockout Threshold Voltage VASD 50 mV Vcc from Low to High 4
Vcc-VBAT Lockout Threshold Voltage VASD 120 mV Vcc from High to Low 4
Auto Recharge Battery Voltage ΔVRECHRG 100 150 200 mV 4
CHGb Pin Output Low Voltage VCHGb 0.3 0.6 V ICHGb=5mA 4
Junction Temperature In Constant Temperature Mode TLIM 165 oC 4
Power FET ON Resistance RON 200 mΩ 4
Soft-Start Time TSS 100 us RPROG=2kΩ 4
Recharge Comparator Filter Time TRECHRG 2 ms 4
Termination Comparator Filter Time TTERM 1 ms 4
PROG Pin Pull-up Current IPROG 3 uA 4

CAD (KiCad official)

  • Symbol: WS4508E-5
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5L (KiCad packages3D, STEP)
  • 3D model files: ws4508e-5-etched.step / ws4508e-5-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ws4508e-5.step / ws4508e-5.glb are the bare package body.

Provenance

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

  • Datasheet: WILLSEMI(Will Semicon) datasheet (11 pp, sha256 10d20a4476ef4b1f, retrieved 2026-10-22, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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