R1243 Series
2A 30V Input PWM Step-down DC/DC Converter
R1243 Series
2A 30V Input PWM Step-down DC/DC Converter
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Description
The R1243 Series are 30V input, CMOS-based PWM step-down DC/DC converters featuring 2A* output current. R1243 includes a soft start circuit and a latch or 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 R1243 provides 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. 700 µA (VIN = 30 V, VFB = 1.0 V) |
| Standby Current | Typ. 0 µA (VIN = 30 V, CE = “L”) |
| Output Voltage Range | Externally Adjustable: 0.8 V to 18.0 V |
| Feedback Voltage | 0.5 V |
| Feedback Voltage Accuracy | ±7 mV |
| Output Current | Max. 2 A |
| Driver ON-resistance | Typ. 175 mΩ |
| Oscillator Frequency | 1000 kHz (Ver.A/B/E) 330 kHz (Ver.C/D) |
| Maximum Duty Cycle | Min. 85% |
| Package | HSOP-8E |
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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R1243x001C/D Typical Application
VOUT=5.0V, Soft Start Time 12ms, Flag Function using
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R1243x001A/B, R1243S001E Efficiency vs. Output Current
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R1243x001C/D Efficiency vs. Output Current
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Related Links
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.
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
R1243 Series