R1240 Series
1.2A 30V Input PWM Step-down DC/DC Converter
R1240 Series
1.2A 30V Input PWM Step-down DC/DC Converter
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Description
The R1240 Series are 30V input, CMOS-based PWM step-down DC/DC converters featuring 1.2A* output current. R1240 include a soft start circuit and a latch or a fold-back protection circuit. By simply using an inductor, resistors, a diode, and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. Due to current mode PWM control, the R1240 provide a fast response and high efficiency. *) This is an approximate value, because output current depending on conditions and external parts.
Spec
| Standard | |
|---|---|
| Input Voltage Range | 4.5 V to 30.0 V (32.0 V) |
| Operating Temperature Range | -40°C to 85°C (125°C) |
| Supply Current | Typ. 500 µA |
| Standby Current | Typ. 0 µA |
| Output Voltage Range | Externally Adjustable: 0.8 V to 15.0 V |
| Feedback Voltage | 0.8 V |
| Feedback Voltage Accuracy | ±12 mV |
| Output Current | 1.2 A |
| Oscillator Frequency | Typ. 1.25 MHz |
| Maximum Duty Cycle | Min. 75%, Typ. 85% |
| Package | DFN(PL)2527-10, SOT-23-6W |
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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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 |
Technical Documents
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Download Circuit Module
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R1240x Typical Application
(VOUT=3.3V)
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R1240x Efficiency vs. Output Current
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Related Links
Quality & Packages
| Product Name | Compatibility | Package | Marking | Reliability |
|---|---|---|---|---|
| R1240K003x-TR |
|
DFN(PL)2527-10 | See datasheet | R1240K |
| R1240N001x-TR-FE |
|
SOT-23-6W | See datasheet | R1240N-FE |
- 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
R1240 Series