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R1202 Series
PWM Step-up DCDC Converter for White LED/PMOLED and General Use with Shutdown Function

Product Specifications

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.

FEATURES

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
Packages DFN1616-6B, TSOT-23-6

APPLICATION INFORMATION

R1202xxxxA/B

R1202xxxxD

TYPICAL CHARACTERISTICS

Efficiency vs. Output Current 5LEDs (10 µH)

Efficiency vs. Output Current 5LEDs (22 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

R1202 Series for Consumer

APPLICATIONS

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

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.


SELECTION GUIDE

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

Product Name   Package Quantity per Reel
R1202Lyz1#-TR ConsumterPLP DFN1616-6B 5,000
R1202Nyz3#-TR-FE ConsumterPLP TSOT-23-6 3,000
  • y … Designation of OVP threshold
    3: 14 V, R1202xxxxA/B/D
    4: 17 V, R1202xxxxA/B
    5: 19 V, R1202xxxxA/B
    6: 21 V, R1202xxxxA/B
    7: 23 V, R1202xxxxA/B/D
  • z … Designation of current limit
    1: Typ. 350mA
    2: Typ. 700mA
  • # … Designation of VFB, auto discharge function
    A: with auto-discharge function, VFB=1.0V
    B: without auto-discharge function, VFB=1.0V
    D: without auto-discharge function, VFB=0.2V

* 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.

DOCUMENT/CONTACT

Purchase

Technical Support

Package *1 Marking Reliability *2
DFN1616-6B R1202L R1202L
TSOT23-6 R1202N R1202N (-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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