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R1204 Series
PWM/VFM Step-up DC/DC Converter for White LED/PMOLED and General Use
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(PLP)1820-6, 0.95mm thickness TSOT-23-6 is available.
Specs & Datasheets
| Consumer | |
|---|---|
| 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(PLP)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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Technical Documents
R1204xx1xA/D/G/H Typical Application
L1: 10µH (A/G) or 22µH (D/H), C1: 1µF, C2: 1µF, R1: 10Ω
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
R1204xx1xD/H Efficiency vs. Output Current: L=22µH (10LEDs)
R1204xx1xF Efficiency vs. Output Current: L=22µH (VOUT=31V)
Quality & Packages
| Product Name | Compatibility | Package | Marking | Reliability |
|---|---|---|---|---|
| R1204Kx12x-TR |
|
DFN(PLP)1820-6 | R1204K | R1204K |
| R1204Nx13x-TR-FE |
|
TSOT-23-6 | R1204N | R1204N-FE |
C
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Refer to the datasheets for the details on the product.
The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
Please contact us or our distributors for unpublished reliability information.
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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 |