R1204 Series
PWM/VFM Step-up DC/DC Converter for White LED/PMOLED and General Use
Description
The R1204 Series are CMOS-based PWM/VFM step-up DC/DC converters, which are optimized to drive white LEDs and PMOLED with constant current. There are two types. The A/D/G/H version is optimized for the serial/parallel drive of white LED with constant current, and the B/C/E/F version is optimized for the general use or the drive of PMOLED. The R1204 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, resistors, capacitors and a diode as external components, PMOLED and white LEDs can be driven with high efficiency. The A/D/G/H 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 DFN(PL)1820-6, 0.95mm thickness TSOT-23-6 is available.
Spec
| Standard | |
|---|---|
| Input Voltage Range | 2.3 V to 5.5 V (6.5 V) |
| 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. 40.2 V |
| Feedback Voltage | 0.2 V (R1204xxxxA/D) 0.4 V (R1204xxxxG/H) 1.0 V (R1204xxxxB/C/E/F) |
| Feedback Voltage Accuracy | ±10 mV (R1204xxxxA/D/G/H) ±15 mV(R1204xxxxB/C/E/F) |
| Driver ON-resistance | Typ. 0.8 Ω |
| Oscillator Frequency | Typ. 1 MHz (R1204xxxxA/B/C/G) Typ. 750 kHz (R1204xxxxD/E/F/H) |
| Maximum Duty Cycle | Min. 91% (R1204xxxxA/B/C/G) Min. 92% (R1204xxxxD/E/F/H) |
| Package | DFN(PL)1820-6, 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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R1204xx1xA/D/G/H Typical Application
L1: 10µH (A/G) or 22µH (D/H), C1: 1µF, C2: 1µF, R1: 10Ω
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R1204xx1xB/C/E/F Typical Application
L1: 10µH (B/C) or 22µH (E/F), C1: 1µF, C2: 1µF, C3: 10pF, R1: 10kΩ, R2: 240kΩ, R3: 0Ω
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R1204xx1xD/H Efficiency vs. Output Current: L=22µH (10LEDs)
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R1204xx1xF Efficiency vs. Output Current: L=22µH (VOUT=31V)
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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