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RP550 Series
Dual 1A PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier
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.
Specs & Datasheets
| Consumer | 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(PLP)2730-12 | DFN3030-12 | DFN3030-12 |
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
RP550K001A Efficiency vs. Output Current (VOUT=3.3V)
Quality & Packages
| Product Name | Compatibility | Package | Marking | Reliability |
|---|---|---|---|---|
| RP550K001A-TR |
|
DFN(PLP)2730-12 | RP550K | RP550K |
| RP550L001B-TR-Y |
|
DFN3030-12 | RP550L | RP550L-Y |
| RP550L001B-TR-A |
|
DFN3030-12 | RP550L | RP550L-A |
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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 |