R1278 Series
30 V, 2 A Synchronous PWM Step-down DC/DC Converter
R1278 Series
30 V, 2 A Synchronous PWM Step-down DC/DC Converter
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Description
The R1278 is a 36 V maximum rated synchronous step-down DC/DC converter with built-in drivers.
With the operating frequency at 2 MHz and a spread-spectrum clock generator, the interference effect on the AM band is small. When an input voltage drops, the switching frequency is automatically reduced to keep output voltage level constant.
Key Benefits
- Provides a high switching frequency at 2 MHz with the efficiency of 87%.
- Maintains the output voltage constant when an input voltage drops by reducing a switching frequency to the minimum of 1/4.
- Achieves the EMI noise reduction by using a spread spectrum clock generator. (Diffusion Rate: +10%).
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Spec
Consumer Industrial Automotive Input Voltage Range 3.6 V to 30.0 V (36.0 V) Operating Temperature Range -40°C to 105°C (125°C) -40°C to 125°C (150°C) -40°C to 125°C (150°C) Supply Current Typ. 1 mA Standby Current Typ. 4 µA Start-up Voltage 4.5 V Output Voltage Range Externally Adjustable: 3.3 V to 5.0 V Feedback Voltage 0.64 V Feedback Voltage Accuracy ±1.0% Output Current 2 A Driver ON-resistance High side: Typ. 0.145 Ω, Low side: Typ. 0.095 Ω Oscillator Frequency Typ. 2 MHz Package HSOP-18 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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Typical Application
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Efficiency (VOUT=5V)
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Related Links
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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 |