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The RT4533/A is a highly integrated LED driver IC capable of driving 10 WLEDs in series. It is composed of a current mode Boost converter integrated with a 36.5V/1.2A power switch.

The RT4533/A supports a wide input voltage range from 2.5V to 5.5V and runs at a fixed frequency of 1.1MHz. The LED current is set via an external resistor and the feedback voltage is regulated to 200mV / 300mV.

For brightness dimming, the RT4533/A supports PWM dimming which determines the feedback reference voltage.

Applications

  • Cellular Phones
  • Digital Cameras
  • Probable Instruments
Key Spec.
RT4533 RT4533A
Status Active Active
Vin (min) (V) 2.5 2.5
Vin (max) (V) 5.5 5.5
SW Freq (typ) (kHz) 1100 1100
Number of LEDs (max) (pcs) 10 10
Iout (max)/channel (mA) 30 30
Iq (typ) (mA) 0.35 0.35
Dimming Control PWM PWM
Topology Boost Boost
Features Cycle-by-Cycle Current Limit;Enable Input;OVP;Stable with Ceramic Capacitor;UVP Cycle-by-Cycle Current Limit;Enable Input;OVP;Stable with Ceramic Capacitor;UVP
Package Type TSOT-26 TSOT-26
Features
  • 2.5V to 5.5V Input Voltage Range
  • 36.5V Open LED Protection for 10 WLEDs
  • PWM Dimming Brightness Control
  • 200mV / 300mV Reference Voltage with ±2% Accuracy
  • 1.1MHz Switching Frequency
  • Built-In Soft-Start
  • Over-Temperature Protection
  • Internal Compensation
  • Current Limit
  • RoHS Compliant and Halogen Free
Technical Documents
TitleItem TypeLast UpdateDownload
Richtek Product Selection Guide [Jan., 2024] Selection Guide2024/01/18
Part NumberPackage TypePackage Qty.Free SampleDistributorStockBuy From Authorized Distributor
RT4533GJ6TSOT-263,000 Request Digikey 5,136 Buy
Mouser 2,459 Buy
Evaluation Board
Part NumberDistributorStockBuy From Authorized Distributor
EVB_RT4533AGJ6 Digikey 0 Lead-Time: 14 weeks
Mouser 0 Lead-Time: 14 weeks
EVB_RT4533GJ6 Digikey 5 Buy
Mouser 0 Lead-Time: 14 weeks
Please confirm with our distributor or sales representative for actual stock status.
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