R1202 Series
PWM Step-up DC/DC Converter for White LED/PMOLED and General Use with Shutdown Function
Description
The R1202 Series are CMOS-based PWM step-up DC/DC converters, which are optimized to drive white LEDs and PMOLED with constant current. There are two types. The A/B versions are optimized for the general use or the drive of PMOLED, and the D version is optimized for the serial drive of white LED with constant current. The R1202 includes an under-voltage lockout circuit (UVLO), a soft-start circuit, and an over-voltage protection circuit (OVP), a thermal shutdown circuit. By simply using an inductor, divider resistors, and capacitors as external components, PMOLED and white LEDs can be driven with high efficiency. At the standby mode, the internal NPN transistor can separate the output from the input. (Shutdown function) The A/B version with auto-discharge function is selectable. D Version can set the LED current with feedback resistor (R1). The brightness of the LEDs and the soft-start time can be adjusted by applying a PWM signal (200Hz to 300kHz) to the CE pin. In addition to DFN1616-6B, 0.95mm thickness TSOT-23-6 is available.
Spec
| Standard | |
|---|---|
| Input Voltage Range | 2.3 V to 5.5 V (6.5 V) (R1202xxxxA/B) 1.8 V to 5.5 V (6.5 V) (R1202xxxxD) |
| Operating Temperature Range | -40°C to 85°C (125°C) |
| Supply Current | Typ. 800 µA |
| Standby Current | Typ. 1 µA |
| Output Voltage Range | Externally Adjustable: Max. 22.2 V |
| Feedback Voltage | 1.0 V (R1202xxxxA/B) 0.2 V (R1202xxxxD) |
| Feedback Voltage Accuracy | ±15 mV (R1202xxxxA/B) ±10 mV (R1202xxxxD) |
| Driver ON-resistance | Typ. 1.35 Ω |
| Oscillator Frequency | Typ. 1.2 MHz |
| Maximum Duty Cycle | Typ. 91% |
| Package | DFN1616-6B, TSOT-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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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 |
Technical Documents
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R1202xxxxA/B Typical Application
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R1202xxxxD Typical Application
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Efficiency vs. Output Current 5LEDs (10 µH)
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Efficiency vs. Output Current 5LEDs (22 µH)
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Related Links
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.
FAQ
Buy / Contact
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Purchase, Request for samples and documentsSales are made through distributors. Please contact your local distributors for any sales-related inquiry such as price.
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Available from 1 piece!Our electronic device products are available through our authorized online distributors.
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Technical Support