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TPS923621

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30V, 1.8A synchronous boost LED driver with 0.1% ratio PWM-controlled analog dimming

Product details

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  • 2.5V to 5.5V input voltage
  • 1.2V I/O Compatible for ADIM pin
  • Integrated 280mΩ/600mΩ LS/HS switch FETs
  • Up to 95% efficiency
  • 130nA ultra-low shutdown current
  • High-accuracy PWM controlled analog dimming down to 0.1% dimming ratio
  • Drives LED string up to 30V
  • Switch current limit
    • 1.8A for TPS923621
    • 2.25A for TPS923622
  • FCCM with 1.1MHz switching frequency options
  • 200mV feedback voltage
  • Internal compensation
  • Protection Features
    • Over-voltage protection
    • Over-current protection
    • Under-voltage lockout protection
    • Thermal shutdown
  • 2.5V to 5.5V input voltage
  • 1.2V I/O Compatible for ADIM pin
  • Integrated 280mΩ/600mΩ LS/HS switch FETs
  • Up to 95% efficiency
  • 130nA ultra-low shutdown current
  • High-accuracy PWM controlled analog dimming down to 0.1% dimming ratio
  • Drives LED string up to 30V
  • Switch current limit
    • 1.8A for TPS923621
    • 2.25A for TPS923622
  • FCCM with 1.1MHz switching frequency options
  • 200mV feedback voltage
  • Internal compensation
  • Protection Features
    • Over-voltage protection
    • Over-current protection
    • Under-voltage lockout protection
    • Thermal shutdown

The TPS923621/2 is a synchronous boost LED driver that integrates both low-side and high-side switch FETs. It features an ultra-low 130nA shutdown current. The TPS923621/2 can drive single or parallel LED strings for LCD back lighting and general illumination.

The feedback voltage is regulated to 200mV and the output current is set by an external sensor resistor, RSET, as shown in the Simplified Schematic. During operation, a PWM signal applied to ADIM pin adjusts the feedback voltage proportionally to the PWM duty cycle, enabling precise analog dimming. The TPS923621/2 supports PWM controlled analog dimming with ratio as low as 0.1%, along with FCCM operation, avoiding audible noises at the output since current modulation remains purely analog.

The TPS923621/2 integrates over-voltage protection that disables the power stage to prevent the output voltage from exceeding the absolute maximum voltage rating during LED open conditions. The TPS923621/2 also provides over-current protection, under-voltage lockout protection and thermal shutdown protection.

The TPS923621/2 is a synchronous boost LED driver that integrates both low-side and high-side switch FETs. It features an ultra-low 130nA shutdown current. The TPS923621/2 can drive single or parallel LED strings for LCD back lighting and general illumination.

The feedback voltage is regulated to 200mV and the output current is set by an external sensor resistor, RSET, as shown in the Simplified Schematic. During operation, a PWM signal applied to ADIM pin adjusts the feedback voltage proportionally to the PWM duty cycle, enabling precise analog dimming. The TPS923621/2 supports PWM controlled analog dimming with ratio as low as 0.1%, along with FCCM operation, avoiding audible noises at the output since current modulation remains purely analog.

The TPS923621/2 integrates over-voltage protection that disables the power stage to prevent the output voltage from exceeding the absolute maximum voltage rating during LED open conditions. The TPS923621/2 also provides over-current protection, under-voltage lockout protection and thermal shutdown protection.

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* Data sheet TPS923621/2 30V Synchronous Boost LED Driver with Ultra-low Shutdown Current and 0.1%-ratio PWM Controlled Analog Dimming datasheet PDF | HTML 20 Oct 2025

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