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About RICOH Electronic Devices
R1203 Series
PWM Step-up DCDC Converter for White LED
Product Specifications
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.
FEATURES
| Input Voltage Range (Maximum Rating) | 1.8 V to 5.5 V (6.5 V) |
|---|---|
| Supply Current | Typ. 500 µA |
| Standby Current | Typ. 1 µA |
| Feedback Voltage | 0.2 V |
| Feedback Voltage Accuracy | ±1.0% (±10mV) |
| Temperature-Drift Coefficient of Feedback Voltage | ±150 ppm/°C |
| Oscillator Frequency | Typ. 1.2 MHz |
| Maximum Duty Cycle | Typ. 91% |
| Switch ON Resistance | Typ. 1.35 Ω |
| UVLO Detector Threshold | Typ. 1.6 V |
| Lx Current Limit Protection | Typ. 700 mA |
| OVP Detector Threshold | Typ. 29.5 V |
| Switching Control | PWM |
| LED dimming control | by external PWM signal (Frequency 200Hz to 300kHz) |
| Packages | DFN1616-6B, SOT-23-6 |
| Ceramic capacitors are recommended | 0.22 µF |
APPLICATION INFORMATION
R1203x071B
TYPICAL CHARACTERISTICS
7LEDs Efficiency vs. Output Current
PIN DESCRIPTION
1.6 mm × 1.6 mmDFN1616-6B
| 1 | CE |
| 2 | VFB |
| 3 | Lx |
| 4 | GND |
| 5 | VIN |
| 6 | VOUT |
*) The tab is substrate level (GND).
2.9 mm × 2.8 mmSOT-23-6
| 1 | CE |
| 2 | VOUT |
| 3 | VIN |
| 4 | Lx |
| 5 | GND |
| 6 | VFB |
R1203 Series for Consumer
APPLICATIONS
- White LED Backlight for portable equipment
SELECTION GUIDE
The package for the ICs can be selected at the user's request.
| Product Name | Package | Quantity per Reel | |
|---|---|---|---|
| R1203L071B-TR |  |
DFN1616-6B | 5,000 |
| R1203N071B-TR-FE | |
SOT-23-6 | 3,000 |
DOCUMENT/CONTACT
| Package *1 | Marking | Reliability *2 |
|---|---|---|
| DFN1616-6B | R1203L | R1203L |
| SOT-23-6 | R1203N | R1203N (-FE) |
*1: The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and land pattern (foot pattern).
*2: Reliability file includes a reliability test report and a reflow profile.
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Sample Online
- R1200 (Step-up, PMOLEDs)
- R1202 (Step-up, White LEDs/PMOLEDs)
- R1203 (Step-up, White LEDs)
- R1204 (Step-up, White LEDs/PMOLEDs)
- R1205 (Step-up, White LEDs/PMOLEDs)
- R1206 (Step-up, White LEDs)
- R1207 (Step-up, White LEDs/PMOLEDs)
- R1208 (Step-up, White LEDs)
- R1214 (Step-up, White LEDs)
- R1218 (Step-up, White LEDs)
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