R1204x Series Step-up DC/DC Converter with Shutdown Function

PublishTime：2020-04-26

The R1204x is a low supply current PWM step-up DC/DC converter. Internally, a single IC consists of an NMOS
FET, an oscillator, a PWM comparator, a voltage reference unit, an error amplifier, a current limit circuit, an under voltage lockout circuit (UVLO), an over-voltage protection circuit (OVP), a soft-start circuit, a maximum duty cycle limit circuit, and a thermal shutdown protection circuit. By simply using an inductor, a resistor, capacitors and a diode as external components, a high-efficiency step-up DC/DC converter can be easily configured. As protection functions, the IC contains a thermal shutdown protection circuit, a current limit circuit, an OVP circuit, and an UVLO circuit. A thermal shutdown circuit detects overheating of the ICs and stops the operation to protect it from damage. A current limit circuit limits the peak current of Lx, and an OVP circuit detects the over voltage of output, and an UVLO circuit detects the low input voltage.
The R1204x provides the R1204xxxA/D/G/H versions, which are optimized for serial driving of white LEDs with
constant current, and the R1204xxxB/C/E/F versions, which are optimized for constant voltage driving. Among the R1204xxxB/C/E/F versions, only the R1204xxxC/F versions are equipped with PWM/VFM auto-switching controls. The LED current can be determined by the value of current setting resistor. The brightness of the LEDs can be quickly adjusted by applying a PWM signal (200 Hz to 300 kHz) to the CE pin. The R1204x is available in DFN(PLP)1820-6 and TSOT-23-6 packages.

Brand of Product：	Ricoh
Part#：	R1204x 、 R1204Kxy2z-TR 、 R1204Nxy3z-TR-FE 、 R1204xxxxA 、 R1204xxxxB 、 R1204xxxxD 、 R1204xxxxE 、 R1204xxxxG 、 R1204xxxxH 、 R1204xxxxC 、 R1204xxxxF 、 R1204x1xxx 、 R1204x2xxx 、 R1204x3xxx 、 VLS252010ET-100M 、 VLF302512MT-100M 、 VLF403212MT-100M 、 VLF302512MT-220M 、 VLF403212MT-220M 、 VLF504012MT-220M 、 CRS12 、 CM105B105K06 、 C2012X5R1H105K 、 C2012X5R1H225K 、 C2012X5R1C475K 、 C2012X5R1E105K 、 R1204xxxxx 、 R1204Kxx2A 、 R1204Kxx2D 、 R1204Kxx2G 、 R1204Kxx2H 、 R1204Kxx2B 、 R1204Kxx2C 、 R1204Kxx2E 、 R1204Kxx2F 、 R1204Nxx3A 、 R1204Nxx3D 、 R1204Nxx3G 、 R1204Nxx3H 、 R1204Nxx3B 、 R1204Nxx3C 、 R1204Nxx3E 、 R1204Nxx3F More Part#
Product Category：	Step-up DC/DC Converter with Shutdown Function More
Application：	[ Constant voltage power source for hand-held equipment ][ OLED power supply for hand-held equipment ][ White LED driver for hand-held equipment ] More
Data Type：	Datasheet More
Safety & Environment Standards：	Halogen Free 、 Pb Free More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：	DFN(PLP)1820-6;TSOT-23-6
Language：	English Chinese Chinese and English Japanese
Date of Creation：	2018/07/11
Version Number：	Ver. B
Data Encoding：	EA-284-180511
Data Size：	2.4 MB

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