RP539 Series
0.5A/1A 6MHz PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier
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Description
The RP539 Series is a low supply current CMOS-based PWM/VFM step-down DC/DC converter with synchronous rectifier featuring 0.5 A/1 A output current*1. Internally, a single converter consists of a reference voltage unit, an error amplifier, a switching control circuit, a mode control circuit, a soft-start circuit, an undervoltage lockout (UVLO) circuit, a thermal shutdown circuit, and switching transistors. The RP539 Series is employing synchronous rectification for improving the efficiency of rectification by replacing diodes with built-in switching transistors.
Using synchronous rectification not only increases circuit performance but also allows a design to reduce parts count. Output voltage controlling method is selectable between a PWM/VFM auto-switching control type and a forced PWM control type, which further reduces noise than a normal PWM control under a light load, and these types can be set by the MODE pin. Output voltage type is selectable between an internally fixed output voltage type and an externally adjustable output voltage type. Protection circuits in the RP539 Series is current limit circuit and thermal shutdown circuit. LX current limit value (Typ.) is selectable between 1.6 A and 1.0 A.
The RP539Z is available in WLCSP-6-P6 which achieves high-density mounting on boards. Using capacitor of 0402-/1005-size (inch/mm) and inductor of 0402-/1005-size (inch/mm) as external parts help to save space for devices.
*1: This is an approximate value. The output current is dependent on conditions and external components.
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Spec
Consumer Input Voltage Range 2.3 V to 5.5 V (6.5 V) Operating Temperature Range Tj = -40°C to 105°C (125°C) Supply Current Typ. 15 µA 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.: 0.6 V to 5.5 VOutput Voltage Accuracy ±1.5% (VSET ≥ 1.2 V), ±18 mV (VSET < 1.2 V) Feedback Voltage 0.6 V Feedback Voltage Accuracy ±9 mV Output Current 0.5 A, 1 A Driver ON-resistance Pch: Typ. 0.175 Ω, Nch: Typ. 0.155 Ω Oscillator Frequency Typ. 6 MHz Maximum Duty Cycle Min. 100% Package WLCSP-6-P6 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
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Typical Application (Fixed Output Voltage Type)
MODE = High: Forced PWM Control, MODE = Low: PWM/VFM Auto-switching Control
CIN: 4.7 µF, COUT: 10 µF, L: 0.47 µH to 0.56 µH
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Typical Application (Adjustable Output Voltage Type)
MODE = High: Forced PWM Control, MODE = Low: PWM/VFM Auto-switching Control
CIN: 4.7 µF, COUT: 10 µF, L: 0.47 µH to 0.56 µH
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Efficiency vs. Output Current (VFM)
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Efficiency vs. Output Current (Forced PWM)
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Related Links
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Quality &
PackagesProduct Name Compatibility Package Marking Reliability RP539Zxxxx-E2-F WLCSP-6-P6 RP539Z RP539Z-F - 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 |
|---|---|
| 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 |