R1211D002A RICOH electronics devices division, R1211D002A Datasheet
![no-image](/images/no-image-200.jpg)
R1211D002A
Manufacturer Part Number
R1211D002A
Description
Step-up DC/DC Controller
Manufacturer
RICOH electronics devices division
Datasheet
1.R1211D002A.pdf
(33 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
R1211D002A-TR
Manufacturer:
RICOH
Quantity:
20 000
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