R1210N221A RICOH [RICOH electronics devices division], R1210N221A Datasheet - Page 2

• Manufacturer Part Number: R1210N221A
• Description: PWM Step-up DC/DC Converter
• Manufacturer: RICOH [RICOH electronics devices division]

process.
phase compensation circuit, resistors for voltage detection, a chip enable circuit. Further, includes a controller against
drastic load transient, a control transistor with low ON-Resistance, ‘L
and an output voltage detector. R1210N××1A Series contain further a circuit for changeover oscillator frequency each.
A low ripple, high efficiency step-up DC/DC converter can be composed of this IC with only three external compo-
nents, or an inductor, a diode and a capacitor.
sponse is improved compared with current model, furthermore the R1210N××1A Series have another function, that is,
when the load current is small, oscillator frequency is decreased by a circuit for switching oscillator frequency from
TYP . 100kHz to 35kHz, therefore, supply current is reduced.
• External Components ................................................................. Only an inductor, a diode, and a capacitor
• Standby Current ......................................................................... TYP . 0µA
• Low Temperature-Drift Coefficient of Output Voltage.............. TYP . ±100ppm/°C
• Output Voltage............................................................................. Stepwise Setting with a step of 0.1V in the range of
• Two choices of Basic Oscillator Frequency................................ 100kHz (××1A/C), 180kHz (××1D)
• Small Package .............................................................................. SOT-23-5 (Mini-mold)
• High Efficiency ............................................................................ TYP . 88%
• Low Ripple, Low Noise
• Built-in a driver transistor with low on-resistance
• Start-up Voltage........................................................................... MAX. 0.9V
• Basic Frequency change-over circuit (only for ××1A type)....... from TYP. 100kHz to 35kHz
R1210N××1× Series
The R1210N××1× Series are PWM step-up DC/DC Converter, with high accuracy, low supply current by CMOS
Each of the R1210N××1× Series consists of an oscillator, a PWM circuit, a reference voltage unit, an error amplifier,
The R1210N Series can detect drastic change of output voltage with a circuit controller. The load transient re-
The built-in chip enable circuit can make the standby mode with ultra low quiescent current.
Since the package for these ICs is small SOT-23-5, high density mounting of the ICs on board is possible.
2.2V to 6.0V (××1C/D)
2.2V to 3.5V (××1A)
(V
IN
=Set Output Voltage×0.6 [V], I
X
switch’, and a protection circuit for L
OUT
=10mA)
X
switch