R1211D002B RICOH [RICOH electronics devices division], R1211D002B Datasheet

R1211D002B

Manufacturer Part Number

R1211D002B

Description

STEP-UP DC/DC CONTROLLER

Manufacturer

RICOH [RICOH electronics devices division]

Datasheet

1.R1211D002B.pdf (40 pages)

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Bonase Electronics (HK) Co., Limited

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OUTLINE

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, divider resisters, and capacitors.

be made externally as for R1211x002A/C Series. B/D version has stand-by mode.

typically at 9ms(A/B, 700kHz version) or 10.5ms(C/D, 300kHz version). As for the protection circuit, after the

soft-starting time, if the maximum duty cycle is continued for a certain period, the R1211x Series latch the

external driver with its off state, or Latch-type protection circuit works.

threshold level), or once after making the circuit be stand-by with chip enable pin and enable the circuit again.

FEATURES

APPLICATIONS

STEP-UP DC/DC CONTROLLER

The R1211x Series are CMOS-based PWM step-up DC/DC converter controllers with low supply current.

Each of the R1211x Series consists of an oscillator, a PWM control circuit, a reference voltage unit, an error

Phase compensation has been made internally in the R1211x002B/D Series, while phase compensation can

Max duty cycle is internally fixed typically at 90%. Soft start function is built-in, and Soft-starting time is set

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

• Standby Current ................................................Typ. 0µA (for B/D version)

• Input Voltage Range .........................................2.5V to 6.0V

• Built-in Latch-type Protection Function (Output Delay Time can be set with an external capacitor)

• Two Options of Basic Oscillator Frequency ......300kHz, 700kHz

• Max Duty Cycle.................................................Typ. 90%

• High Reference Voltage Accuracy ....................±1.5%

• U.V.L.O. Threshold level ...................................Typ. 2.2V (Hysteresis Typ. 0.13V)

• Small Packages ................................................SOT-23-6W or thin (package height Max. 0.85mm) SON-6

• Constant Voltage Power Source for portable equipment.

• Constant Voltage Power Source for LCD and CCD.

R1211x SERIES

NO.EA-088-0604

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