RP505 Series
1A PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier
Description
The RP505 Series are low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier. RP505 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. The xx1A/B version with an internally fixed output voltage type and the 001C version with an externally adjustable output voltage type are available. RP505 includes a soft start circuit, an under-voltage lockout circuit (UVLO), thermal shutdown circuit and a latch protection circuit. By simply using an inductor and capacitors (and resistors) as external components, a high-efficiency step-down DC/DC converter can be easily configured. The small inductor (2.2µH) and output capacitor (10µF) can be used by the switching of 2.25MHz. A 2mm square compact DFN(PL)2020-8 package is available.
Spec
| Standard | |
|---|---|
| Input Voltage Range | 2.3 V to 5.5 V (6.5 V) |
| Operating Temperature Range | -40°C to 85°C (125°C) |
| Supply Current | Typ. 40 µA (VFM, no load) |
| Standby Current | Typ. 0 µA |
| Output Voltage Range | Internally Fixed Ver.: 0.6 V to 3.3 V (0.1 V step) Externally Adjustable Ver.: 0.8 V to 3.3 V |
| Output Voltage Accuracy | ±1.5% (VOUT ≥ 1.2 V, Ta = 25°C) ±18 mV (VOUT < 1.2 V) |
| Output Voltage Temperature Coefficient | ±100 ppm/°C |
| Feedback Voltage | 0.6 V |
| Feedback Voltage Accuracy | ±9 mV |
| Feedback Voltage Temperature Coefficient | ±100 ppm/°C |
| Output Current | 1 A |
| Driver ON-resistance | Pch: Typ. 0.23 Ω, Nch: Typ. 0.20 Ω (VIN = 3.6 V) |
| Oscillator Frequency | Typ. 2.25 MHz |
| Maximum Duty Cycle | Min. 100% |
| Package | DFN(PL)2020-8 |
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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RP505Kxx1A/B Typical Application
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RP505K001C Typical Application
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RP505K331x Efficiency vs. Output Current
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Related Links
Quality & Packages
| Product Name | Compatibility | Package | Marking | Reliability |
|---|---|---|---|---|
| RP505Kxx1x-TR |
|
DFN(PL)2020-8 | RP505K | RP505K |
- 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