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R1205 Series
PWM Step-up DCDC Converter for White LED/PMOLED and General Use

Product Specifications

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.

FEATURES

Input Voltage Range (Maximum Rating) 2.3 V to 5.5 V (6.5 V) (R1205x8xxA)
1.8 V to 5.5 V (6.5 V) (R1205x8xxB/C)
Supply Current Typ. 800 µA
Standby Current Typ. 1 µA
Feedback Voltage 1.0 V ±15 mV (R1205x8xxA)
0.2 V ±10 mV (R1205x8xxB)
0.4 V ±10 mV (R1205x8xxC)
Oscillator Frequency Typ. 1.2 MHz
Maximum Duty Cycle Typ. 91%
UVLO Function Typ. 2.0 V (Hys.Typ. 0.2 V) (R1205x8xxA)
Typ. 1.6 V (Hys.Typ. 0.1 V) (R1205x8xxB/C)
Lx Current Limit Function Select from 350 mA, 700 mA
Over Voltage Protection Typ. 25 V
LED dimming control (R1205x8xxB/C) by external PWM signal (Frequency 200 Hz to 300 kHz)
Thermal Protection Function Typ. 150°C (Hys.Typ. 50°C)
Switch ON Resistance Typ. 1.35 Ω
Packages DFN1616-6B, TSOT-23-6

APPLICATION INFORMATION

R1205x8xxA

R1205x8xxB/C

TYPICAL CHARACTERISTICS

R1205N823A Efficiency vs. Output Current
VOUT=10V (10 µH)

R1205N823B/C Efficiency vs. Output Current
6LEDs (10 µH)

PIN DESCRIPTION

DFN1616-6B

DFN1616-6B1.6 mm × 1.6 mm
1 CE
2 VFB
3 Lx
4 GND
5 VIN
6 VOUT

*) The tab is substrate level (GND).

TSOT-23-6

TSOT-23-62.9 mm × 2.8 mm
1 CE
2 VOUT
3 VIN
4 Lx
5 GND
6 VFB

R1205 Series for Consumer

APPLICATIONS

  • Constant Voltage Power Source for portable equipment
  • OLED power supply for portable equipment
  • White LED Backlight for portable equipment

SELECTION GUIDE

The OVP threshold voltage, current limit, package and VFB/Auto discharge are user-selectable options.

Product Name   Package Quantity per Reel
R1205L8x1#-TR Consumter DFN1616-6B 5,000
R1205N8x3#-TR-FE Consumter TSOT-23-6 3,000
  • x … Designation of current limit.
    1: Typ. 350 mA
    2: Typ. 700 mA
  • # … Designation of VFB.
    A: 1.0 V
    B: 0.2 V
    C: 0.4 V

DOCUMENT/CONTACT

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Technical Support

Package *1 Marking Reliability *2
DFN1616-6B R1205L R1205L
TSOT-23-6 R1205N R1205N (-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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