RP550 Series
Dual 1A PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier
Description
The RP550 Series are dual output CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier. RP550 can be selected from two control types by input signal to the MODE pin - forced PWM control or PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current. RP550 includes a soft start circuit, an under-voltage lockout circuit (UVLO), thermal shutdown circuit and a latch protection circuit. By simply using an inductor, resistors and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. The small inductor (2.2 µH) and output capacitor (10 µF) can be used by the switching of 2.25 MHz.
Spec
| Standard | Industrial | Automotive | |
|---|---|---|---|
| Input Voltage Range | 2.3 V to 5.5 V (6.5 V) | ||
| Operating Temperature Range | -40°C to 85°C (125°C) | -40°C to 105°C (150°C) | -40°C to 105°C (150°C) |
| Supply Current | Typ. 45 µA (VFM, no load, per channel) | ||
| Standby Current | Typ. 0 µA | ||
| Output Voltage Range | 0.6 V to 3.3 V | ||
| Feedback Voltage | 0.6 V | ||
| Feedback Voltage Accuracy | ±9 mV | ||
| Feedback Voltage Temperature Coefficient | ±100 ppm/°C | ||
| Output Current | 1 A x 2ch | ||
| Driver ON-resistance | Typ. Pch. 0.25 Ω, Nch. 0.21 Ω (VIN = 3.6 V) | ||
| Oscillator Frequency | Typ. 2.25 MHz | Typ. 2.3 MHz | Typ. 2.3 MHz |
| Maximum Duty Cycle | Min. 100% | ||
| Package | DFN(PL)2730-12 | DFN3030-12 | DFN3030-12 |
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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Typical Application
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RP550K001A Efficiency vs. Output Current (VOUT=3.3V)
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Related Links
Quality & Packages
| Product Name | Compatibility | Package | Marking | Reliability |
|---|---|---|---|---|
| RP550K001A-TR |
|
DFN(PL)2730-12 | RP550K | RP550K |
| RP550L001B-TR-Y |
|
DFN3030-12 | RP550L | RP550L-Y |
| RP550L001B-TR-A |
|
DFN3030-12 | RP550L | RP550L-A |
- 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.
Qualification Test Plan (QTP) Sheets
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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