R1275 Series
2A 30V Input Forced PWM Step-down DC/DC Converter with Synchronous Rectifier
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Description
The R1275 is a 36-V synchronous step-down DC/DC converter with built-in drivers. It is designed for industrial equipment, OA equipment and home electronics that require a 24-V input.
It operates at a 2-MHz switching frequency, which allows to use a small inductor to ensure a high transient response and to maintain a high efficiency at heavy load condition. Using a spread spectrum clock generator, the EMI noise can be reduced.
Under cranking condition, the switching frequency is automatically reduced to keep output voltage level constant.
- Provides a high switching frequency at 2 MHz with an efficiency of 87%.
- Maintains the output voltage constant by reducing a switching frequency to the minimum 1/4 when an input-output voltage difference is small.
- Achieves the EMI noise reduction by using a spread spectrum clock generator. (Diffusion Rate: +8%).
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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 105°C (125°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
*1) Connecting a Schottky barrier diode between LX and GND can reduce the LX noise and improve the efficiency.
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Efficiency (VOUT = 5 V)
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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 |