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R1286 Series
PWM Step-up/Inverting DCDC Converter with Synchronous Rectifier for AMOLED/LCD

Product Specifications

The R1286 Series are CMOS-based PWM step-up/inverting DC/DC converters featuring 250mA×2 output current with synchronous rectifier. R1286 includes a soft start circuit, an under-voltage lockout circuit (UVLO), a latch protection circuit, a thermal shutdown circuit, and a shutdown circuit. By simply using two inductors and three capacitors as external components, a high-efficiency step-up/inverting DC/DC converter can be easily configured.

R1286 is available in two types: R1286K001B is the type to which the output voltage (VOUTP and VOUTN) can be adjusted by external resistors. R1286KxxxA/C~G are the type to which the step-up output voltage (VOUTP) is internally fixed and the inverting output voltage (VOUTN) can be adjusted dynamically by the single wire interface. The R1286 has a sequenced start up. After the CE pin is enabled, the step-up output is starting up followed by the inverting output after a delay time. As for shutdown, both outputs will be turned off by the auto-discharge function. R1286 is used for applications such as LCD and AMOLED displays.

FEATURES

Input Voltage Range (Maximum Rating) 2.3 V to 5.5 V (6.0 V)
Supply Current Typ. 1.2 mA (No switching)
Standby Current Typ. 0.1 µA (CE="L")
Step-up Output Voltage 4.6 V to 5.8 V (internally fixed),
4.6 V to 5.8 V, Externally adjustable (VFB: 1V) (001B)
Inverting Output Voltage -2.0 V to -6.0 V (internally fixed),
-2.0 V to -6.0 V, Externally adjustable (VFB: 0V) (001B) ,
Dynamically adjustable output voltage with single wire interface.
Feedback Voltage Accuracy Step-up: ± 9 mV (Except B), ± 15 mV (B)
Inverting: ± 70 mV (Except B) , ± 25 mV (B)
Output Current Step-up: 250 mA, Inverting: 250 mA
Oscillator Frequency 1.75 MHz
Maximum Duty Cycle Step-up: Typ. 85% , Inverting: Typ. 90%
UVLO Detect Voltage Typ. 2.05 V
Soft Start Time Step-up: Typ. 2.4 ms, Inverting: Typ. 2.8 ms (B)
Coil-current Limit Circuit Step-up: Typ. 1 A, Inverting: Typ. 1.5 A
Latch Protection Circuit Delay time for protection Typ. 16 ms, Typ. 40 ms
Thermal Shutdown Circuit Stops at 150°C
Function Auto-discharge Function
Package DFN(PLP)2730-12

APPLICATION INFORMATION

R1286KxxxA/C~G

C1,C2,C3: 4.7µF

R1286K001B

C1,C2,C3: 4.7µF, C4: 0.1µF

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
  xxA/C~G 001B
1 VOUTNS VFBN
2 VOUTN
3 LXN
4 PVCC
5 VCC
6 GND
7 PGND
8 LXP
9 VOUTP
10 VOUTPS VFBP
11 CE
12 TST VREF

*) The tab is substrate level (GND).


R1286 Series for Consumer

APPLICATIONS

  • Fixed voltage power supply for portable equipment
  • Fixed voltage power supply for AMOLED, LCD

SELECTION GUIDE

The inverting output voltage (VOUTN), the positive output voltage (VOUTP) and the versions of the inverting output voltage are user-selectable options.

Product Name   Package Quantity per Reel
R1286K$xx#-TR Consumter DFN(PLP)2730-12 5,000
  • $ … Delay Time for Protection setting serial number
    0: Typ: 16 msec
    1: Typ: 40 msec *) A/C~G version only
  • xx … Serial number to specify a combination of the VOUTP voltage and VOUTN preset value.
    The externally adjustable output voltage type is (01).
  • # … Specify designation method of VOUTP and VOUTN settings.
    A/C to G: VOUTP voltage is internally fixed. VOUTN voltage can be adjusted dynamically by the single wire interface.
    B: VOUTP and VOUTN are externally adjusted.

DOCUMENT/CONTACT

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Technical Support

Package *1 Marking Reliability *2
DFN(PLP)2730-12 R1286K R1286K

*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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