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R1283 Series
PWM Step-up/Inverting DCDC Converter for CCD/LCD

Product Specifications

The R1283 Series are dual output CMOS-based PWM step-up/inverting DC/DC converters. R1283 includes a soft start circuit, an under-voltage lockout circuit (UVLO), and a latch protection circuit. By simply using inductors, resistors, capacitors, and diodes as external components, a high-efficiency step-up/inverting DC/DC converter can be easily configured.

R1283 has internal 400mΩ ON resistance transistors for both step-up and inverting. Start-up sequence of two DC/DC converters can be selected. Since the shutdown sequence can also be set by the auto-discharge function of the inverting DC/DC converter, the products are ideally suitable for applications that require setting of power supply start-up/shutdown sequence for CCD, LCD, and OLED.

FEATURES

Operating Voltage (Maximum Rating) 2.5 V to 5.5 V (6.5 V)
Step Up DC/DC (CH1) Internal Nch MOSFET Driver (RON=400 mΩ Typ.)
Adjustable VOUT Up to 20 V with external resistor
Internal Soft start function (Typ. 4.5 ms)
Over Current Protection
Maximum Duty Cycle: 91% (Typ.)
Inverting DC/DC (CH2) Internal Pch MOSFET Driver (RON=400 mΩ Typ.)
Adjustable VOUT Up to Vdd-20 V with external resistor
Auto Discharge function for negative output
Internal Soft start function (Typ. 4.5 ms)
Over Current Protection
Maximum Duty Cycle: 91% (Typ.)
Control Short Protection with timer latch function (Typ. 50 ms); 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.
CE with start up sequence function
CH1 -> CH2 (R1283K001x) / CH2 -> CH1 (R1283K002x) Selectable
UVLO function
Operating Frequency Selection 300 kHz / 700 kHz / 1400 kHz
Package DFN(PLP)2730-12

APPLICATION INFORMATION

TYPICAL CHARACTERISTICS

Efficiency vs. Output Current (Step-up)

Efficiency vs. Output Current (Inverting)

PIN DESCRIPTION

DFN(PLP)2730-12

DFN(PLP)2730-122.7 mm × 3.0 mm
1 NC
2 Lx1
3 Lx2
4 VOUTN
5 CE
6 VFB2
7 VREF
8 VCC
9 VFB1
10 GND
11 PVCC
12 PGND

*) The tab is substrate level (GND).


R1283 Series for Consumer

APPLICATIONS

  • Fixed voltage power supply for portable equipment
  • Fixed voltage power supply for CCD, OLED, LCD

PRODUCT LONGEVITY PROGRAM

R1283K operate PRODUCT LONGEVITY PROGRAM.
This program has been introduced to help customers select the most appropriate part for applications that require long life cycles.


SELECTION GUIDE

The start-up sequence, oscillator frequency, and the package for the ICs can be selected at the user’s request.

Product Name   Package Quantity per Reel
R1283K00x#-TR ConsumterPLP DFN(PLP)2730-12 5,000
  • x … The start-up sequence can be designated.
    1: Step-up → Inverting
    2: Inverting → Step-up
  • # … The oscillator frequency is the option as follows.
    A: 300 kHz
    B: 700 kHz
    C: 1400 kHz

DOCUMENT/CONTACT

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Package *1 Marking Reliability *2
DFN(PLP)2730-12 R1283K R1283K

*1: The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and land pattern (foot pattern).
*2: Reliability file includes a reliability test report and a reflow profile.

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