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R1204 Series
PWM/VFM Step-up DCDC Converter for White LED/PMOLED and General Use

Product Specifications

The R1204 Series are CMOS-based PWM/VFM step-up DC/DC converters, which are optimized to drive white LEDs and PMOLED with constant current. There are two types. The A/D/G/H version is optimized for the serial/parallel drive of white LED with constant current, and the B/C/E/F version is optimized for the general use or the drive of PMOLED.

The R1204 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, resistors, capacitors and a diode as external components, PMOLED and white LEDs can be driven with high efficiency. The A/D/G/H 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 DFN(PLP)1820-6, 0.95mm thickness TSOT-23-6 is available.

FEATURES

Input Voltage Range (Maximum Rating) 2.3 V to 5.5 V (6.5 V)
Supply Current Typ. 800 µA
Standby Current Typ. 1 µA
Feedback Voltage 0.2 V ±10 mV (R1204xxxxA/D)
0.4 V ±10 mV (R1204xxxxG/H)
1.0 V ±15 mV (R1204xxxxB/C/E/F)
Lx Current Limit Function Min. 700 mA
Over Voltage Protection 23 V, 33 V, 42 V (±1.5V)
Oscillator Frequency Typ. 1.0 MHz (R1204xxxxA/B/C/G)
Typ. 750 kHz (R1204xxxxD/E/F/H)
Maximum Duty Cycle Min. 91% (R1204xxxxA/B/C/G)
Min. 92% (R1204xxxxD/E/F/H)
FET ON Resistance Typ. 0.8 Ω
UVLO Function Typ. 2.0 V
Thermal Protection Function Stops at 150°C
LED Dimming Control for R1204xxxxA/D/G/H by external PWM signal (200Hz to 300kHz frequency)
Packages DFN(PLP)1820-6, TSOT-23-6
Recommended Bypass Capacitor 1.0 µF

APPLICATION INFORMATION

R1204xx1xA/D/G/H

L1: 10µH (A/G) or 22µH (D/H), C1: 1µF, C2: 1µF, R1: 10Ω

R1204xx1xB/C/E/F

L1: 10µH (B/C) or 22µH (E/F), C1: 1µF, C2: 1µF, C3: 10pF, R1: 10kΩ, R2: 240kΩ, R3: 0Ω

TYPICAL CHARACTERISTICS

Efficiency vs. Output Current L=22µH (VLF302512MT-220)

R1204xx1xD/H (10LEDs)

R1204xx1xF (VOUT=31V)

PIN DESCRIPTION

DFN(PLP)1820-6

DFN(PLP)1820-61.8 mm × 2.0 mm
1 VOUT
2 Lx
3 GND
4 VIN
5 CE
6 VFB

*) The tab is substrate level (GND).

TSOT-23-6

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

R1204 Series for Consumer

APPLICATIONS

  • Constant voltage power source for hand-held equipment
  • OLED power supply for hand-held equipment
  • White LED driver for hand-held equipment

PRODUCT LONGEVITY PROGRAM

R1204 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 package type, the OVP detector threshold, the feedback voltage and the PWM//VFM auto switching control are user- selectable options as described below.

Product Name   Package Quantity per Reel
R1204Kx12z-TR ConsumterPLP DFN(PLP)1820-6 5,000
R1204Nx13z-TR-FE ConsumterPLP TSOT-23-6 3,000
  • x … Designation of OVP detector threshold
    1: 23V
    2: 33V
    3: 42V
  • z … Designation of the feedback voltage, the oscillator frequency, the PWM/VFM auto switching control
z Feedback Voltage Oscillator Frequency PWM/VFM Auto Switching Control
A Typ. 0.2 V Typ. 1 MHz No
B Typ. 1 V Typ. 1 MHz No
C Typ. 1 V Typ. 1 MHz Yes
D Typ. 0.2 V Typ. 750 kHz No
E Typ. 1 V Typ. 750 kHz No
F Typ. 1 V Typ. 750 kHz Yes
G Typ. 0.4 V Typ. 1 MHz No
H Typ. 0.4 V Typ. 750 kHz No

DOCUMENT/CONTACT

Purchase

Technical Support

Package *1 Marking Reliability *2
DFN(PLP)1820-6 R1204K R1204K
TSOT-23-6 R1204N R1204N (-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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