RP501 Series
1A PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier
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Description
The RP501 Series are low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier. RP501 can be selected from two control types by input signal to the MODE pin - fixed PWM control or PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current. RP501 includes a soft start circuit, an under-voltage lockout circuit (UVLO), and a latch protection circuit. By simply using an inductor and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. The small inductor (2.2µH) can be used by the switching of 2.25MHz. The frequency accuracy improved to ±10%.
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Spec
Consumer Input Voltage Range 2.5 V to 5.5 V (6.5 V) Operating Temperature Range -40°C to 85°C (125°C) Supply Current Typ. 450 µA (PWM, no switching)
Typ. 140 µA (VFM, no switching)Standby Current Typ. 0 µA (CE = "L") Output Voltage Range 1.0 V to 3.3 V (0.1 V step) Output Voltage Accuracy ±1.5% (Ta = 25°C) Output Current 1 A Oscillator Frequency Typ. 2.25 MHz Maximum Duty Cycle Min. 100% Package DFN(PL)2527-10 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 -
Technical
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Typical Application
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RP501K331x (PWM/VFM auto switching control) Efficiency vs. Output Current
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Related Links
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Quality &
PackagesProduct Name Compatibility Package Marking Reliability RP501Kxx1x-TR DFN(PL)2527-10 RP501K RP501K - 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.
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Sample / Buy
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Buy Online
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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.
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Download Datasheet
Functional Description
TSD | Thermal Shutdown Function |
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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 |