R1203 Series
PWM Step-up DC/DC Converter for White LED
Download Datasheet
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Description
The R1203 Series are CMOS-based PWM step-up DC/DC converters, which are optimized to drive white LEDs with constant current. R1203 includes an under-voltage lockout circuit (UVLO), and over-voltage protection circuit (OVP). By simply using an inductor, a resistor, capacitors and a diode as external components, white LEDs can be driven with constant current and high efficiency. The LED current can be determined by the value of current setting resistor. The brightness of the LEDs can be adjusted quickly by applying a PWM signal (200Hz to 300kHz) to the CE pin. Two different pin layout of SOT-23-6 package as R1203N and R1206N are available.
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Spec
Consumer Input Voltage Range 1.8 V to 5.5 V (6.5 V) Operating Temperature Range -40°C to 85°C (125°C) Supply Current Typ. 500 µA Standby Current Typ. 1 µA Output Voltage Range Externally Adjustable: 28.7 V Feedback Voltage 0.2 V Feedback Voltage Accuracy ±10 mV Feedback Voltage Temperature Coefficient ±150 ppm/°C Driver ON-resistance Typ. 1.35 Ω Oscillator Frequency Typ. 1.2 MHz Maximum Duty Cycle Typ. 91% Package SOT-23-6 Protections / Functions
TSD ILX OCP OVP UVLO OVLO Reverse Shutdown Soft Start SSCG PGOOD Auto Discharge Anti-ringing Sequencing Max Duty Ext. Phase LED Adjust 
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Technical
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R1203x071B Typical Application
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7LEDs Efficiency vs. Output Current
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Related Links
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Quality &
Packages- Refer to the datasheets for the details on the product.
- The package file or the datasheet includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
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Sample / Buy
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Buy Online
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Buy, Request for Samples, Request for Information Materials
Authorized Distributors
Please contact your local distributors for any sales-related inquiry such as price, stock, delivery, etc.
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Download Datasheet
Functional Description
| TSD | Thermal Shutdown Function |
|---|---|
| ILX | LX Current Limit Function |
| OCP | Overcurrent Protection |
| OVP | Overvoltage Protection |
| UVLO | Undervoltage Lockout Protection |
| OVLO | Overvoltage Lockout Protection |
| Reverse | Reverse Current Protection Circuit |
| Shutdown | Shutdown Function |
| Soft Start | Soft Start Function |
| SSCG | Spread Spectrum Clock Generator Function |
| PGOOD | Power Good Output |
| Auto Discharge | Auto Discharge Function |
| Anti-ringing | Anti-ringing Switch Function |
| Sequencing | Start-up Sequencing Control |
| Max Duty | Maximum Duty Cycle |
| Ext. Phase | Externally Adjustable Phase Compensation |
| LED Adjust | LED High-speed Dimming Control |