R1208 Series

PWM Step-up DC/DC Converter for White LED

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Description

The R1208 Series are PWM step-up DC/DC converters for white LEDs. The R1208 includes an under voltage lockout circuit (UVLO), an overvoltage protection circuit (OVP), a thermal shutdown protection circuit, and current drivers for four white LED channels. By simply using an inductor, a resistor, capacitors and a diode, white LEDs can be driven with constant current and high efficiency. The LED current can be determined by the value of current setting resistor. The brightness of the LEDs can be adjusted quickly by applying a PWM signal (200 Hz to 300 kHz) to the CE pin. A 2.7-mm x 3.0-mm square compact DFN(PL)2730-12 package is available.

Spec

	Consumer
Input Voltage Range	2.7 V to 22.0 V (24 V)
Operating Temperature Range	-40°C to 85°C (125°C)
Supply Current	Typ. 600 µA
Standby Current	Typ. 1.5 µA
Output Voltage Range	Externally Adjustable: Max. 42 V
Driver ON-resistance	Typ. 0.28 Ω
Oscillator Frequency	Typ. 750 kHz / 450 kHz
Maximum Duty Cycle	95% (750 kHz) / 97% (450 kHz)
Package	DFN(PL)2730-12
LED電流精度	±3% (Ta = 25°C)

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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
R1208Kx12x-TR		DFN(PL)2730-12	R1208K	R1208K

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