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R1204 Series

PWM/VFM Step-up DC/DC Converter for White LED/PMOLED and General Use

  • Consumer
  • PLP
  • RoHS

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.

Specs & Datasheets

  Consumer
Input Voltage Range 2.3 V to 5.5 V (6.5 V)
Operating Temperature Range -40°C to 85°C (125°C)
Supply Current Typ. 800 µA
Standby Current Typ. 1 µA
Output Voltage Range Externally Adjustable: Max. 40.2 V
Feedback Voltage 0.2 V (R1204xxxxA/D)
0.4 V (R1204xxxxG/H)
1.0 V (R1204xxxxB/C/E/F)
Feedback Voltage Accuracy ±10 mV (R1204xxxxA/D/G/H)
±15 mV(R1204xxxxB/C/E/F)
Driver ON-resistance Typ. 0.8 Ω
Oscillator Frequency Typ. 1 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)
Package DFN(PLP)1820-6, TSOT-23-6

Download Datasheet

Protections / Functions

Functional Description

TSD ILX OCP OVP UVLO OVLO Reverse Shutdown Soft Start SSCG PGOOD Auto Discharge Anti-ringing Sequencing Max Duty Ext. Phase LED Adjust
                   

Technical Documents

R1204xx1xA/D/G/H Typical Application

R1204xx1xA/D/G/H Typical Application

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

R1204xx1xB/C/E/F Typical Application

R1204xx1xB/C/E/F Typical Application

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

R1204xx1xD/H Efficiency vs. Output Current: L=22µH (10LEDs)

R1204xx1xD/H Efficiency vs. Output Current: L=22µH (10LEDs)

R1204xx1xF Efficiency vs. Output Current: L=22µH (VOUT=31V)

R1204xx1xF Efficiency vs. Output Current: L=22µH (VOUT=31V)

Quality & Packages

Product Name Compatibility Package Marking Reliability
R1204Kx12x-TR
  • gradeConsumerC
  • plpP
DFN(PLP)1820-6 R1204K R1204K
R1204Nx13x-TR-FE
  • gradeConsumerC
  • plpP
TSOT-23-6 R1204N R1204N-FE

Refer to the datasheets for the details on the product.
The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
Please contact us or our distributors for unpublished reliability information.

Sample / Buy

Functional Description

TSD Thermal Shutdown Function
ILX LX Current Limit Function
OCP Overcurrent Protection
OVP Overvoltage Protection
UVLO Undervoltage Lockout Protection
OVLO Overvoltage Lockout Protection
Reverse Reverse Current Protection Circuit
Shutdown Shutdown Function
Soft Start Soft Start Function
SSCG Spread Spectrum Clock Generator Function
PGOOD Power Good Output
Auto Discharge Auto Discharge Function
Anti-ringing Anti-ringing Switch Function
Sequencing Start-up Sequencing Control
Max Duty Maximum Duty Cycle
Ext. Phase Externally Adjustable Phase Compensation
LED Adjust LED High-speed Dimming Control

Search for similar products under conditions below.

Category:DC/DC Switching Regulators

Topology Boost
VIN
min (V)
2.3
VIN
max (V)
5.5
VOUT
max (V)
40.2
ISS
(µA)
800