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.
|Input Voltage Range (Maximum Rating)||2.3 V to 5.5 V (6.5 V) (R1202xxxxA/B)
1.8 V to 5.5 V (6.5 V) (R1202xxxxD)
|Supply Current||Typ. 800 µA|
|Standby Current||Typ. 1 µA|
|Feedback Voltage||1.0 V ±15 mV (R1202xxxxA/B)
0.2 V ±10 mV (R1202xxxxD)
|Oscillator Frequency||Typ. 1.2 MHz|
|Maximum Duty Cycle||Typ. 91%|
|UVLO Function||Typ. 2.0 V (Hys.Typ. 0.2V) (R1202xxxxA/B)
Typ. 1.6 V (Hys.Typ. 0.1V) (R1202xxxxD)
|Lx Current Limit Function||Select from 350 mA, 700 mA|
|Over Voltage Protection||Select from 14V-23V (Refer the Selection Guide)|
|LED dimming control for R1202xxxxD||by external PWM signal (Frequency 200Hz to 300kHz)|
|Thermal Protection Function||Typ. 150°C (Hys.Typ. 50°C)|
|Built-in Auto Discharge Function||R1202xxxxA|
|NMOS ON Resistance||1.35 Ω|
Efficiency vs. Output Current 5LEDs (10 µH)
Efficiency vs. Output Current 5LEDs (22 µH)
*) The tab is substrate level (GND).
PRODUCT LONGEVITY PROGRAM
R1202 series operate PRODUCT LONGEVITY PROGRAM (ten-year supply is maintained as of January, 2016).
This program has been introduced to help customers select the most appropriate part for applications that require long life cycles.
The OVP threshold voltage, current limit, package and VFB/Auto discharge are user-selectable options.
|Product Name||Package||Quantity per Reel|
* Auto-discharge function quickly lowers the output voltage to 0V, when the chip enable signal is switched from the active mode to the standby mode, by releasing the electrical charge accumulated in the external capacitor.
|Package *1||Marking||Reliability *2|
*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.