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R1208 Series
PWM Step-up DCDC Converter for White LED

Product Specifications

The R1208 Series are PWM step-up DC/DC converters for white LEDs. The R1208 includes an under voltage lockout circuit (UVLO), an overvoltage protection circuit (OVP), a thermal shutdown protection circuit, and current drivers for four white LED channels. By simply using an inductor, a resistor, capacitors and a diode, 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 (200 Hz to 300 kHz) to the CE pin. A 2.7-mm x 3.0-mm square compact DFN(PLP)2730-12 package is available.

FEATURES

Input Voltage Range (Maximum Rating) 2.7 V to 22 V (24 V)
Supply Current Typ. 600 µA
Standby Current Typ. 1.5 µA
Lx Current Limit Typ. 2 A
Overvoltage Protection (OVP) Typ. 23 V / 33 V / 43.5 V
Oscillator Frequency Typ. 750 kHz / 450 kHz
Maximum Duty Cycle 95% (750 kHz) / 97% (450 kHz)
Nch MOSFET ON Resistance Typ. 0.28 Ω
Undervoltage Lockout (UVLO) Typ. 2.4 V
Thermal Shutdown Typ. 150°C
LED Dimming Control By sending a PWM signal (200 Hz to 300 kHz) to the CE pin
Package DFN(PLP)2730-12

APPLICATION INFORMATION

TYPICAL CHARACTERISTICS

R1208K Efficiency vs. Output Current
R1208x312B VLF504012MT-220M / 6LED × 4 Strings

PIN DESCRIPTION

DFN(PLP)2730-122.7 mm × 3.0 mm

DFN(PLP)2730-12

1 VIN 7 Lx
2 LED1 8 VOUT
3 ISET 9 GND
4 VS 10 LED4
5 CE 11 LED3
6 PGND 12 LED2

*) The tab is substrate level (GND).


R1208 Series for Consumer

APPLICATIONS

  • LED backlight driver for LCD displays for portable equipment
  • LED backlight driver for LCD displays for Tablets and Note PCs

PRODUCT LONGEVITY PROGRAM

R1208 series operate PRODUCT LONGEVITY PROGRAM.
This program has been introduced to help customers select the most appropriate part for applications that require long life cycles.


SELECTION GUIDE

The OVP threshold voltage and the oscillator frequency are user-selectable options.

Product Name   Package Quantity per Reel
R1208Kx12#-TR ConsumterPLP DFN(PLP)2730-12 5,000
  • x … Specify the OVP threshold voltage.
    1: 23 V
    2: 33 V
    3: 43.5 V
  • # … Specify the oscillator frequency.
    A: 750 kHz
    B: 450 kHz

DOCUMENT/CONTACT

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Technical Support

Package *1 Marking Reliability *2
DFN(PLP)2730-12 R1208K R1208K

*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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