R1205 Series
PWM Step-up DC/DC Converter for White LED/PMOLED and General Use
Description
The R1205 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 version is optimized for the general use or the drive of PMOLED, and the B/C version is optimized for the serial drive of white LED with constant current. The R1205 includes a diode, 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, and capacitors as external components, white LEDs can be driven with high efficiency. The B/C 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. Two different pin layout of TSOT-23-6 package as R1205N and R1207N are available.
Spec
| Standard | |
|---|---|
| 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. 800 µA |
| Standby Current | Typ. 1 µA |
| Output Voltage Range | Externally Adjustable: Max. 24.2 V (0.1 V step) |
| Feedback Voltage | 1.0 V (R1205x8xxA) 0.2 V (R1205x8xxB) 0.4 V (R1205x8xxC) |
| Feedback Voltage Accuracy | ±15 mV (R1205x8xxA) ±10 mV (R1205x8xxB/C) |
| 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 | OCP | OVP | UVLO | OVLO | Reverse | Shutdown | Soft Start | SSCG | PGOOD | Auto Discharge | Anti-ringing | Sequencing | Max Duty | Ext. Phase | LED Adjust |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 |
|
|
|
|
|
Functional Description
| TSD | Thermal Shutdown Function |
|---|---|
| OCP | Overcurrent Protection Note: The function previously labeled as "ILX (LX Current Limit Function)" is now shown as "OCP." |
| 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
-
R1205x8xxA Typical Application
-
R1205x8xxB/C Typical Application
-
R1205N823A Efficiency vs. Output Current: VOUT=10V (10 µH)
-
R1205N823B/C Efficiency vs. Output Current: 6LEDs (10 µH)
-
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
-
Purchase, Request for samples and documentsSales are made through distributors. Please contact your local distributors for any sales-related inquiry such as price.
-
Available from 1 piece!Our electronic device products are available through our authorized online distributors.
-
Technical Support