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FAN5333BSX

Boost LED driver, 30V/1.5A switch, 1.5MHz, 315mV Vfb, SOT-23-5

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Manufacturer Part：

FAN5333BSX

Package：

5-SOT-23 (2.9 x 1.6 x 1.3mm)

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Description

Product Overview

The FAN5333BSX from onsemi is a high-efficiency boost LED driver with a 30V integrated N-channel MOSFET switch. It features 1.5MHz switching frequency, up to 1.5A peak switch current, 315mV feedback voltage, cycle-by-cycle current limit, and over-voltage protection in a 5-pin SOT-23 package.

Key Specifications

Manufacturer onsemi
Topology Boost (Step-Up)
Input Voltage 1.8V to 5.5V
Output Voltage Up to 30V
Peak Switch Current 1.5A
Output Power 1.5W
Switching Frequency 1.5MHz
Feedback Voltage 315mV (FAN5333B)
Shutdown Current <1uA
Package 5-SOT-23 (2.9 x 1.6mm)
Operating Temperature -40C to +85C

Features

  • 1.5MHz fixed switching frequency
  • 30V integrated N-channel MOSFET switch
  • Up to 1.5A peak switch current
  • 1.5W output power capability
  • Low shutdown current: <1uA
  • Cycle-by-cycle current limit
  • Low feedback voltage: 315mV (B version)
  • Over-voltage protection
  • Internal compensation
  • Thermal shutdown

Applications

  • Cell phone flash LED drivers
  • PDAs and handheld devices
  • Display bias supplies
  • LED backlighting
  • Camera flash modules

The onsemi FAN5333BSX is a general-purpose LED driver featuring fixed-frequency PWM operation and an integrated FET switch. The high output power makes it suitable for driving flash LEDs in serial connections. The 1.5MHz switching frequency minimizes switching noise measured at the battery terminal of handheld communications equipment. The low on-resistance of the internal N-channel switch ensures high efficiency and low power dissipation. The 315mV feedback voltage minimizes power loss in the current-setting resistor. Cycle-by-cycle current limiting keeps the peak switch current below 1.5A, while over-voltage protection and thermal shutdown provide comprehensive fault protection.

The FAN5333BSX operates as a fixed-frequency boost converter for LED driving: 1) Boost Regulation: The internal N-channel MOSFET switches at 1.5MHz, storing energy in an external inductor during the on-time and releasing it to the output through an external Schottky diode during the off-time. The output voltage rises to whatever level is needed to drive the LED string current. 2) Current Regulation: The feedback (FB) pin monitors the voltage across an external current-setting resistor in series with the LEDs. The regulator adjusts the switch duty cycle to maintain 315mV at the FB pin, setting the LED current to ILED = 315mV/RSET. 3) Protection: Cycle-by-cycle current limiting protects the switch during overload. Over-voltage protection activates if the output exceeds the safe range. Thermal shutdown disables the device at excessive junction temperatures.

Pin Name Type Function
1 SW Output Switch pin (connect to inductor and Schottky)
2 GND Ground Ground
3 SHDN Input Shutdown control (active high to enable)
4 FB Input Current feedback (315mV reference)
5 VIN Power Input supply (1.8V to 5.5V)
  • Serial flash LED driver in cell phone camera modules
  • LED backlight boost supply for handheld displays
  • Display bias voltage generation in portable devices
Manufacturer Part Number Package Notes
onsemi FAN5333ASX SOT-23-5 110mV feedback version
TI TPS61041DBVR SOT-23-5 28V, 500mA LED driver
Diodes Inc AL8805WS-7 SOT-25 30V, 1A LED driver
onsemi CAT4139TD-T3 SOT-23-5 25V, 750mA boost LED driver
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Quality Assurance

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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