R1280 Series
PWM Step-up/Inverting DC/DC Controller
Download Datasheet
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Description
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.
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Spec
Consumer Input Voltage Range 2.5 V to 5.5 V (6.5 V) Operating Temperature Range -40°C to 85°C (125°C) Supply Current Typ. 1.4 mA (VIN = 5.5 V, EXT at no load) Standby Current Typ. 0 µA (VIN = 5.5 V, Ver. B) Output Voltage Accuracy ±1.5% (Ta = 25°C) Feedback Voltage Boost: 1.0 V / Inverting: 0 V Feedback Voltage Accuracy Boost: ±1.5% / Inverting: ±12 mV Oscillator Frequency Typ. 700 kHz (Ver. A/B), 200 kHz (Ver. C) Package SON-10 Protections / Functions
TSD ILX OCP OVP UVLO OVLO Reverse Shutdown Soft Start SSCG PGOOD Auto Discharge Anti-ringing Sequencing Max Duty Ext. Phase LED Adjust 
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Technical
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R1280D002A/C Typical Application
L1,L2: 6.8µH (R1280D002A), 22µH (R1280D002C)
C1=C2=10µF -
R1280D002B Typical Application
L1,L2: 6.8µH
C1=C2=10µF -
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Quality &
Packages- Refer to the datasheets for the details on the product.
- The package file or the datasheet includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
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Sample / Buy
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Buy Online
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Buy, Request for Samples, Request for Information Materials
Authorized Distributors
Please contact your local distributors for any sales-related inquiry such as price, stock, delivery, etc.
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Download Datasheet
Functional Description
| TSD | Thermal Shutdown Function |
|---|---|
| ILX | LX Current Limit Function |
| OCP | Overcurrent Protection |
| OVP | Overvoltage Protection |
| UVLO | Undervoltage Lockout Protection |
| OVLO | Overvoltage Lockout Protection |
| Reverse | Reverse Current Protection Circuit |
| Shutdown | Shutdown Function |
| Soft Start | Soft Start Function |
| SSCG | Spread Spectrum Clock Generator Function |
| PGOOD | Power Good Output |
| Auto Discharge | Auto Discharge Function |
| Anti-ringing | Anti-ringing Switch Function |
| Sequencing | Start-up Sequencing Control |
| Max Duty | Maximum Duty Cycle |
| Ext. Phase | Externally Adjustable Phase Compensation |
| LED Adjust | LED High-speed Dimming Control |