R1211D002A RICOH electronics devices division, R1211D002A Datasheet

R1211D002A

Manufacturer Part Number

R1211D002A

Description

Step-up DC/DC Controller

Manufacturer

RICOH electronics devices division

Datasheet

1.R1211D002A.pdf (33 pages)

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Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

R1211D002A-TR

Manufacturer:

RICOH

Quantity:

20 000

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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.

made externally as for R1211X002A/C Series. B/D version has stand-by mode. Max duty cycle is internally fixed

typically at 90%. Soft start function is built-in, and Soft-starting time is set 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. The delay time for latch the state can be set with an external capacitor.

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

Rev. 1.10

Phase compensation has been made internally in the R1211X002B/D Series, while phase compensation can be

To release the protection circuit, restart with power-on (Voltage supplier is equal or less than UVLO detector

OUTLINE

FEATURES

APPLICATIONS

Each of the R1211X Series consists of an oscillator, a PWM control circuit, a reference voltage unit, an error

The R1211X Series are CMOS-based PWM step-up DC/DC converter controllers with low supply current.

Input Voltage Range

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

Two Options of Basic Oscillator Frequency

Max Duty Cycle

High Reference Voltage Accuracy

U.V.L.O. Threshold level

Small Package

Standby Current

Constant Voltage Power Source for portable equipment.

Constant Voltage Power Source for LCD and CCD.

SOT-23-6W or thin (package height MAX. 0.85mm) SON-6 (Under Development)

TYP. 0µA (for B/D version)

2.5V to 6.0V

Typ. 90%

- 1 -

300kHz, 700kHz

Typ. 2.2V (Hysteresis TYP. 0.13V)

1.5%

Step-up DC/DC Controller

R1211X Series

2001.8.30

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