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%).
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Spec
Consumer 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 ILX OCP OVP UVLO OVLO Reverse Shutdown Soft Start SSCG PGOOD Auto Discharge Anti-ringing Sequencing Max Duty Ext. Phase LED Adjust -
Technical
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Typical Application
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DFN3030-12B PCB Example
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Related Links
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Quality &
PackagesProduct Name Compatibility Package Marking Reliability R1271Lxx1x-TR DFN3030-12B See datasheet R1271L R1271Sxx1x-E2-FE HSOP-18 See datasheet R1271S-FE R1271Lxx1x-TR-Y DFN3030-12B See datasheet R1271L-Y R1271Sxx1x-E2-YE HSOP-18 See datasheet R1271S-YE R1271Lxx1x-TR-A DFN3030-12B See datasheet R1271L-A R1271Lxx1x-TR-K DFN3030-12B See datasheet R1271L-K R1271Sxx1x-E2-AE HSOP-18 See datasheet R1271S-AE R1271Sxx1x-E2-KE HSOP-18 See datasheet R1271S-KE - 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 |
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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 |