R1204 Series

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

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Description

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(PL)1820-6, 0.95mm thickness TSOT-23-6 is available.

Spec

	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(PL)1820-6, TSOT-23-6

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

Functional Description

Quality &
Packages

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

Refer to the datasheets for the details on the product.
The package file or the datasheet includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.

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