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参数资料
| 型号： | R1285L591A |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, DSO12 |
| 封装： | 2.70 X 3 MM, DFN-12 |
| 文件页数： | 1/12页 |
| 文件大小： | 241K |
| 代理商： | R1285L591A |
R1285L series
2ch DCDC for OLED
NO.EA-209-090703
1
V 1.4
OUTLINE
The R1285L 2ch DC/DC converter is designed for OLED Display power source. It contains a step up DC/DC
converter and an inverting DC/DC converter to generate two required voltages by OLED Display.
Step up DC/DC converter generates boosted output voltage to 4.6V ~ 5.0V. Inverting DC/DC converter generates
negative voltage –2.0V ~ -6.0V independently. Each of the R1285 series consists of an oscillator, a PWM control
circuit, a voltage reference, error amplifiers, over current protection circuits, short protection circuits, an under
voltage lockout circuit (UVLO), a complete shutdown switch and an Nch driver for boost operation, a Pch driver for
inverting, and so on. A high efficiency boost and inverting DC/DC converter can be composed with external
inductors, diodes, capacitors and resistors. Start up sequence is internally made.
FEATURES
Operating Voltage 2.3V ~ 4.8V
Step Up DC/DC (CH1)
Internal Pch MOSFET for complete shutdown (Ron=300m
ΩTyp.)
Internal Nch MOSFET Driver (Ron=300m
ΩTyp.)
Output Voltage (VOUTP) 4.6V ~ 5.0V (0.2VStep)
Auto Discharge function for positive output
Internal Soft start function (Typ. 4.5ms)
Over Current Protection
Maximum Duty Cycle: 85%(Typ.)
Inverting DC/DC (CH2)
Internal Pch MOSFET Driver (Ron=600m
Ω Typ.)
Output Voltage (VOUTN) -2V ~ -6V (0.1VStep)
[ R1285LxxxA ]
Adjustable Vout Up to -6V with external resistors
[ R1285L00xB ]
Auto Discharge function for negative output
Internal Soft start function (Typ. 4.5ms)
Over Current Protection
Maximum Duty Cycle: 90%(Typ.)
Control
Short Protection with timer latch function (Typ. 50ms)
Short condition for either or both two outputs makes all output drivers off and latches. If the
maximum duty cycle continues for a certain time, these output drivers will be turned off. This
function prevents irregular current from overheating the R1285 .
CE with start up sequence function ( CH1
→CH2 )
UVLO function.
Operating Frequency 1400kHz
Small package DFN12 ( 2.7mm x 3.0mm )
APPLICATION
Fixed voltage power supply for portable equipment
Fixed voltage power supply for OLED
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