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R1280 Series
PWM Step-up/Inverting DCDC Controller

Product Specifications

The R1280 Series are low supply current, dual output CMOS-based PWM step-up/inverting DC/DC controllers. R1280 includes a soft start circuit, an under-voltage lockout circuit (UVLO), and a latch type protection circuit. By simply using inductors, resistors, capacitors, power MOS, and diodes, as external components, a high-efficiency step-up/inverting DC/DC converter can be easily configured. R1280 comes in three versions: A and C versions with adjustable oscillator maximum duty cycle, phase compensation, and soft start time with an external capacitor and resistor, and B version with adjustable soft start time with an external capacitor and with CE pin.

FEATURES

Input Voltage Range (Maximum Rating) 2.5 V to 5.5 V (6.5 V)
Supply Current Typ. 1.4 mA (VIN= 5.5 V, EXT at no load)
Standby Current Typ. 0 µA (VIN= 5.5 V, B Version)
Step-up Feedback Voltage 1.0 V
Step-up Feedback Voltage Accuracy ±1.5%
Inverting Feedback Voltage 0 V
Inverting Feedback Voltage Accuracy ±12 mV
Reference Voltage Output 1.5 V (±1.5%)
Oscillator Frequency 700 kHz (A/B Versions), 200 kHz (C Version)
UVLO Detect Voltage 2.2 V
Latch Type Protection Circuit Delay time for protection Typ. 100 ms
Package SON-10
Ceramic capacitors can be used 10 µF or more

APPLICATION INFORMATION

R1280D002A/C

L1,L2: 6.8µH (R1280D002A), 22µH (R1280D002C)
C1=C2=10µF

R1280D002B

L1,L2: 6.8µH
C1=C2=10µF

PIN DESCRIPTION

SON-10

SON-102.9 mm × 3.0 mm
1 EXT1
2 GND
3 AMPOUT1 or CE
4 DTC1
5 VFB1
6 VFB2
7 DTC2
8 VREFOUT
9 VIN
10 EXT2

*) The tab suspension leads on back side are substrate level (GND).


R1280 Series for Consumer

APPLICATIONS

  • Constant Voltage Power Source for Portable Equipment
  • Constant Voltage Power Source for LCD and CCD

SELECTION GUIDE

The mask option for the ICs can be selected at the user's request. The selection can be made with designating the part number as shown below;

Product Name   Package Quantity per Reel
R1280D002x-TR-FE Consumter SON-10 3,000
  • x … Designation of Mask Option
    A: version: fosc=700kHz, with External Phase Compensation for Channel 1
    B: version: fosc=700kHz, with Internal Phase Compensation and standby mode
    C: version: fosc=200kHz, with External Phase Compensation for Channel 1

DOCUMENT/CONTACT

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Technical Support

Package *1 Marking Reliability *2
SON-10 R1280D R1280D (-FE)

*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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