R1212D Datasheet, PDF (2/41 Pages) RICOH electronics devices division – STEP-UP DC/DC CONTOLLER

R1212D
BLOCK DIAGRAM
VREFOUT
Internal VR
DTC
VFB
AMPOUT
VREF
Er.Amp
VREFOUT
Oscillator
PWM Comp
UVLC
Latch
VIN
EXT
GND
DELAY
SELECTION GUIDE
In the R1212D Series, the oscillator frequency, UVLO detector threshold, and with/without internal limit of
maximum duty cycle can be selected at the user's request.
The selection can be made with designating the part number as shown below;
R1212D10xx-TR-x ←Part Number
↑
↑
a
b
Code
Contents
a
Oscillator Frequency
0A Typ. 700kHz
UVLO Detector Threshold
Typ. 1.9V
0B Typ. 1.4MHz
Typ. 1.9V
1A Typ. 700kHz
1C Typ. 300kHz
Typ. 2.1V
Typ. 2.1V
2A Typ. 700kHz
Typ. 2.8V
2C Typ. 300kHz
Typ. 2.8V
b
Designation of composition of pin plating
-F: Lead free plating
Internal Maximum Duty Limit
No
No
Typ. 90%
Typ. 91.5%
Typ. 90%
Typ. 91.5%
2