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R1243 Series
2A 30V Input PWM Step-down DC/DC Converter
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.
Specs & Datasheets
| Consumer | |
|---|---|
| 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 | DFN(PLP)2527-10, HSOP-8E |
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 Documents
R1243x001C/D Typical Application
VOUT=5.0V, Soft Start Time 12ms, Flag Function using
R1243x001A/B, R1243S001E Efficiency vs. Output Current
R1243x001C/D Efficiency vs. Output Current
Quality & Packages
| Product Name | Compatibility | Package | Marking | Reliability |
|---|---|---|---|---|
| R1243K001x-TR |
|
DFN(PLP)2527-10 | R1243K | R1243K |
| R1243S001x-E2-FE |
|
HSOP-8E | R1243S | R1243S-FE |
C
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Refer to the datasheets for the details on the product.
The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
Please contact us or our distributors for unpublished reliability information.
Sample / Buy
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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.
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 |