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BL8851

Public Made by Adom

by adom

BL(Shanghai Belling) AC-DC Controllers & Regulators, SOT-23-6. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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BL8851

BL(Shanghai Belling) · AC-DC Controllers & Regulators · SOT-23-6

BL8851 from BL(Shanghai Belling), in a SOT-23-6. 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 for the controller.
2 FB input Feedback input whose voltage level, together with the current-sense signal at pin 4, sets the PWM duty cycle; open-loop voltage 3.9 to 4.2 V and absolute maximum -0.3 to 7 V.
3 RT input Dual-function pin connected through an NTC resistor to ground for over-temperature shutdown/latch control, or through a Zener to VDD for adjustable over-voltage protection; absolute maximum -0.3 to 7 V.
4 CS input Current sense input with 220 ns leading edge blanking and 0.75 V internal current limit threshold; absolute maximum -0.3 to 7 V.
5 VDD power_in Power supply input, recommended 10 to 30 V, absolute maximum 40 V DC, with UVLO on at 9 V typ and off at 15.3 V typ.
6 GATE output Totem-pole gate driver output for the external power MOSFET, clamped at 15 V.

Key specifications

Parameter Value
Manufacturer BL(Shanghai Belling)
Package SOT-23-6
Category Power Management ICs
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
VDD DC Supply Voltage VDD 40 V 3
VDD DC Clamp Current 10 mA 3
FB Input Voltage -0.3 7 V 3
Sense Input Voltage -0.3 7 V 3
RT Input Voltage -0.3 7 V 3
Operating Junction Temperature TJ -20 150 °C Min/Max 3
Storage Temperature Tstg -55 160 °C 3
VDD Supply Voltage VDD 10 30 V 3
Operating Ambient Temperature TA -20 85 °C 3
VDD Start up Current Istartup 5 20 uA VDD=11V, measure leakage current into VDD 4
Operation Current I_VDD_Operation 2 mA VFB=3V 4
VDD Under Voltage Lockout Enter UVLO(ON) 8 9 10 V Enter 4
VDD Under Voltage Lockout Exit UVLO(OFF) 14.3 15.3 16.3 V Exit (Recovery) 4
Pull-up PMOS active Vpull-up 13 V 4
VDD clamp voltage Vdd_clamp 30 32 34 V Ivdd=10mA 4
Over voltage protection voltage OVP(ON) 24 26 28 V CS=0V,FB=3V, Ramp up VDD until gate clock is off 4
Latch release voltage Vlatch_release 5 V 4
VFB Open Loop Voltage VFB_Open 3.9 4.2 V 4
PWM input gain Avcs 2 V/V ΔVFB/ΔVCS 4
Maximum duty cycle 75 80 85 % VDD=14V,VFB=3V,VCS=0V 4
Threshold enter green mode Vref_green 2 V 4
Threshold exit burst mode Vref_burst_H 1.275 V 4
Threshold enter burst mode Vref_burst_L 1.175 V 4
FB pin short circuit current IFB_Short 0.4 mA Short FB pin to GND and measure current 4
Power Limiting FB Threshold Voltage VTH_PL 3.7 V 4
Power limiting Debounce Time TD_PL 80 88 96 mSec 4
FB Input Impedance ZFB_IN 4 Kohm 4
Soft start time 4 ms 4
Leading edge blanking time T_blanking 220 ns 4
Sense Input Impedance ZSENSE_IN 40 Kohm 4
Over Current Detection and Control Delay TD_OC 120 nSec From Over Current Occurs till the Gatedrive output start to turn off 4
Internal Current Limiting Threshold Voltage VTH_OC 0.75 V FB=3.3V 4
CS voltage clamper Vocp_clamper 0.9 V 4
Normal Oscillation Frequency FOSC 60 65 70 KHZ VDD=14V, FB=3V, CS=0V 4
Frequency jittering △f_OSC -4 4 % 4
Shuffling frequency F_shuffling 32 Hz 4
Frequency Temperature Stability △f_Temp 1 % 4
Frequency Voltage Stability f_VDD 1 % 5
Burst Mode Base Frequency F_Burst 22 KHZ 5
Output low level VOL 1 V VDD=14V, Io=5mA 5
Output high level VOH 6 V VDD=14V, Io=20mA 5
Output clamp voltage V_clamp 15 V 5
Output rising time T_r 175 nS 1V ~ 12V @ CL=1000pF 5
Output falling time T_f 85 nS 12V ~ 1V @ CL=500pF 5
Output current of RT pin IRT 95 100 105 uA 5
Threshold voltage for OTP VOTP 0.95 1 1.05 V 5
OTP debounce time Td_OTP 32 Cycle 5
Float voltage at RT pin VRT_FL 2.3 V 5
External OVP threshold voltage Vth_OVP 4 V 5

CAD (KiCad official)

  • Symbol: BL8851
  • Footprint: Package_TO_SOT_SMD:SOT-23-6
  • 3D model: SOT-23-6 (KiCad packages3D, STEP)
  • 3D model files: bl8851-etched.step / bl8851-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bl8851.step / bl8851.glb are the bare package body.

Provenance

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

  • Datasheet: BL(Shanghai Belling) datasheet (7 pp, sha256 0553dcea6b39e677, retrieved 2026-10-22, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-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