R1271 Series
30 V, 1 A Synchronous PWM Step-down DC/DC Converter
R1271 Series
30 V, 1 A Synchronous PWM Step-down DC/DC Converter
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Description
The R1271 is a synchronous step-down DC/DC converter with a maximum input voltage rating of 42 V. This device is suitable for small inductors with the switching frequency of 2 MHz. The external components are only an inductor and several capacitors and a resistance. The tiny DFN package option makes the power circuit compact.
Key Benefits
- High efficiency 85% is realized with switching frequency of 2 MHz
- The output voltage is maintained at cranking by reducing a switching frequency to minimum 1/4 of normal frequency.
- EMI noise reduction by using a spread spectrum clock generator. (Diffusion Rate: +10%).
Spec
| Standard | Industrial | Automotive | |
|---|---|---|---|
| Input Voltage Range | 3.6 V to 30.0 V (42.0 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 | 3.3 V, 3.6 V, 4.0 V, 5.0 V | ||
| Output Voltage Accuracy | ±1.0% (Ta = 25°C) | ||
| Output Current | 1 A | ||
| Driver ON-resistance | High side: Typ. 0.4 Ω, Low side: Typ. 0.2 Ω | ||
| Oscillator Frequency | Typ. 2 MHz | ||
| Package | DFN3030-12B, HSOP-18 | ||
Protections / Functions
| TSD | 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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Functional Description
| TSD | Thermal Shutdown Function |
|---|---|
| OCP | Overcurrent Protection Note: The function previously labeled as "ILX (LX Current Limit Function)" is now shown as "OCP." |
| 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 |
Technical Documents
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Typical Application
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DFN3030-12B PCB Example
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Related Links
Quality & Packages
| Product Name | Compatibility | Package | Marking | Reliability |
|---|---|---|---|---|
| R1271Lxx1x-TR-U |
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DFN3030-12B | See datasheet | R1271L-U |
| R1271Sxx1x-E2-FEU |
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HSOP-18 | See datasheet | R1271S-FEU |
| R1271Lxx1x-TR-YU |
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DFN3030-12B | See datasheet | R1271L-YU |
| R1271Sxx1x-E2-YEU |
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HSOP-18 | See datasheet | R1271S-YEU |
| R1271Lxx1x-TR-AU |
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DFN3030-12B | See datasheet | R1271L-AU |
| R1271Lxx1x-TR-KU |
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DFN3030-12B | See datasheet | R1271L-KU |
| R1271Sxx1x-E2-AEU |
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HSOP-18 | See datasheet | R1271S-AEU |
| R1271Sxx1x-E2-KEU |
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HSOP-18 | See datasheet | R1271S-KEU |
- 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.
FAQ
Buy / Contact
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Purchase, Request for samples and documentsSales are made through distributors. Please contact your local distributors for any sales-related inquiry such as price.
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Available from 1 piece!Our electronic device products are available through our authorized online distributors.
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Technical Support
R1271 Series