STEP-UP DC/DC CONTOLLER
The R1215D Series are CMOS-based PWM step-up DC/DC converter controllers
with low supply current.
Each of the R1215D Series consists of an oscillator, a PWM comparator circuit, a reference voltage unit, an
error amplifier, a reference current unit, a protection circuit, and an under voltage lockout (UVLO) circuit.
A low
ripple, high efficiency step-up DC/DC converter can be composed of this IC with some external components, or
an inductor, a diode, a power MOSFET, resisters, and capacitors.
Maximum duty cycle and the soft start time are easily adjustable with external resistors and capacitors. As for
the protection circuit, after the soft-starting time, if the maximum duty cycle is continued for a certain period,
the
R1215D Series latch the external driver with its off state, or the latch-type protection circuit works.
The delay time for latch the state can be set with an external capacitor.
To release the protection circuit, restart with power-on (Voltage supplier is equal or less than UVLO detector
threshold level). |
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 Input
Voltage Range |
1.8V to 5.5V |
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| Two
Options of Basic Oscillator Frequency |
Typ. 700kHz, 1.4MHz |
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| Built-in
Latch-type Protection Function (Output Delay Time can be set with an external capacitor) |
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| Maximum
Duty Cycle/Soft-start time |
Adjustable with external capacitors |
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| High
Reference Voltage Accuracy |
±1.5% |
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| UVLO
Threshold level |
Typ. 1.6V/1.79V by mask option |
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| Small
Temperature Coefficient of Reference Voltage |
Typ. ±150ppm/°C |
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| Package |
SON-8 (t=Max. 0.9mm) |
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Constant Voltage Power Source for portable equipment.
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Constant Voltage Power Source for LCD and CCD.
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| * All PDF files are less than 1MB unless otherwise stated. |
| * If you don't have Adobe Reader, you can download free. |
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Technical Info.
Technical Information on Ricoh Power Management ICs.
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Product Catalog
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| Selection guide is available for download in PDF format. |
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Non-promotion / Discontinued Products
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R1215D
Series
