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| 型号： | R1290K001A-E2 |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, QCC24 |
| 封装： | 4 X 4 MM, TQFN-24 |
| 文件页数： | 1/43页 |
| 文件大小： | 643K |
| 代理商： | R1290K001A-E2 |
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R1290x SERIES
3ch DC/DC for TFT LCD
NO.EA-154-080125
1
OUTLINE
The R1290 series are the optimized DC/DC converter ICs for TFT LCD displays. Each of the R1290 series
contains one PWM step-up DC/DC converter controller and two diode charge-pump controllers. The
charge-pumps can control a boost output and a negative output and have the output voltage regulation function
with external resistors.
The power on sequence can be made with setting the delay time with external capacitors for each charge pump
channel.
FEATURES
Operating Voltage Range ......................................2.0V ~ 5.5V
Step-up DC/DC controller part
Internal 2A capability Nch MOSFET Driver (Ron=150m Typ.)
Over Current Protection Function
Adjustable VOUT up to 20V with external resistors
Adjustable Phase compensation with external components
Max duty adjustable with external resistors for DTC pin
Soft-start time adjustable with external capacitor for SS pin
Oscillator Frequency: Adjustable frequency with resistors (180kHz~1400kHz)
Charge-pump part
Adjustable output voltage with external resistors
Sequence function: Charge-pump turns on after the main step-up converter voltage outputs. The positive
charge-pump and the negative charge-pump turn on sequence control is possible with setting delay time
for each channel
Oscillator Frequency: 1/4 of the main step-up DCDC converter oscillator frequency
Controller part
Under Voltage Lock-Out (UVLO: selectable detector threshold from 1.8V, 2.2V or 2.8V)
Reference voltage (VREF: Typ.1.2V)
Short Protection with timer latch function (adjustable delay time with external capacitor)
: Shutdown all the outputs if at least one of three outputs is short to the GND.
Stand-by function by CE pin
Package
Thin 24-pin Package QFN24
APPLICATIONS
Constant Voltage Power Supply for LCD and CCD
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