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R1275 Series
2A 30V Input Forced PWM Step-down DC/DC Converter with Synchronous Rectifier
The R1275 is a 36-V synchronous step-down DC/DC converter with built-in drivers. It is designed for industrial equipment, OA equipment and home electronics that require a 24-V input.
It operates at a 2-MHz switching frequency, which allows to use a small inductor to ensure a high transient response and to maintain a high efficiency at heavy load condition. Using a spread spectrum clock generator, the EMI noise can be reduced.
Under cranking condition, the switching frequency is automatically reduced to keep output voltage level constant.
- Provides a high switching frequency at 2 MHz with an efficiency of 87%.
- Maintains the output voltage constant by reducing a switching frequency to the minimum 1/4 when an input-output voltage difference is small.
- Achieves the EMI noise reduction by using a spread spectrum clock generator. (Diffusion Rate: +8%).
Specs & Datasheets
| Consumer | Industrial | Automotive | |
|---|---|---|---|
| Input Voltage Range | 3.6 V to 30.0 V (36.0 V) | ||
| Operating Temperature Range | -40°C to 105°C (125°C) | -40°C to 105°C (125°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 | Externally Adjustable: 3.3 V to 5.0 V | ||
| Feedback Voltage | 0.64 V | ||
| Feedback Voltage Accuracy | ±1.0% | ||
| Output Current | 2 A | ||
| Driver ON-resistance | HIgh side: Typ. 0.110 Ω, Low side: Typ. 0.045 Ω | ||
| Oscillator Frequency | Typ. 2 MHz | ||
| Package | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Technical Documents
Typical Application
*1) Connecting a Schottky barrier diode between LX and GND can reduce the LX noise and improve the efficiency.
Efficiency (VOUT = 5 V)
Quality & Packages
| Product Name | Compatibility | Package | Marking | Reliability |
|---|---|---|---|---|
| R1275S003x-E2-FE |
|
HSOP-18 | R1275S | R1275S-FE |
| R1275S003x-E2-YE |
|
HSOP-18 | R1275S | R1275S-YE |
| R1275S003x-E2-AE |
|
HSOP-18 | R1275S | R1275S-AE |
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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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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 |