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DC/DC Converters for LCD/OLED/CCD

Step-up and Charge Pump Type DC/DC Converters

These products are suitable for the power management of LCDs, OLEDs and CCDs. Many variations are available such as step-up DC/DC controller, step-up and step-down dual output converter and step-up and positive/negative charge pump triple output converter. These products include an under-voltage lockout circuit (UVLO), and a latch type protection circuit. The products with a built-in the sequence control circuit option are able to control a start-up sequence and a shutdown sequence.
Product
Name
Control Input Voltage Range Output
Voltage
Range
Voltage
Accuracy *1
Switching
Frequency
Output
Tr.
Lx
Current
Limit*2
Protection
Circuit
Type
Other Features? Package Data
Sheet
(PDF)
R1293K PWM, Step-up 2.2V to 5.5V Up to 16.0V,
Ext. Adjustable
±15mV 300kHz to 1MHz,
Ext. Adjustable
Internal 2A Latch DC/DC output with noise reduction function.
VCOM amplifier 1 channel,
GAMMA amplifier 6 channel.
Thermal
Soft-Start : Ext. Adjustable
Phase : Ext.
Maxduty : Ext. Adjustable
QFN(PLP)
0404-32
Download
LDO 1.8V to 2.5V  ±1% Internal IOUT=
350mA
Amplifier 5.0V to 16.0V - - - -
R1290K CH1: PWM, Step-up 2.0V to 5.5V
: 101A
2.5V to 5.5V
: 102A
3.3V to 5.5V
: 103A
CH1: Up to 20.0V,
Ext. Adjustable
±15mV 180kHz to 1.4MHz,
Ext. Adjustable
Internal CH1: 2A Latch The charge pump operates at
1/4th operating frequency.
Soft-Start : Ext. Adjustable
Sequencing UVLO
Phase : Ext.
Maxduty : Ext. Adjustable
QFN0404-24 Download
CH2: Charge pump,
Positive
CH2/3: Ext. Adjustable ±25mV -
CH3: Charge pump,
Negative
±30mV -
  • *1For the externally adjustable output voltage type, this is a feedback voltage accuracy.
  • *2Lx current limit is different from output current.

*

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Distributors

Ricoh semiconductor products are available at those dealers.

Technical Info.

  • Application Note

    Technical Information on Ricoh Power Management ICs.

Product Catalog

  • Product Catalog

    Selection guide is available for download in PDF format.

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