RP509 Series
0.5A/1A 6MHz PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier
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Description
The RP509 is a low supply current PWM/VFM step-down DCDC converter with synchronous rectifier featuring 0.5A / 1A output current.
Output voltage controlling method is selectable between a forced PWM control type and a PWM/VFM auto-switching control type, and can be set by the MODE pin.
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 under-voltage lockout (UVLO) circuit, a thermal shutdown circuit, and switching transistors.
Furthermore, RP509 is current limit circuit and thermal shutdown circuit. Lx current limit value (Typ.) is selectable between 1.6 A and 1.0 A.
The RP509Z is available in WLCSP−6−P6 which achieves high-density mounting on boards. A high frequency of 6 MHz enables to use capacitor of 0402- / 1005-size (inch / mm) and inductor of 0603- /1608-size (inch / mm) as external parts help to save space for devices.The RP509N is available in SOT-23-6.
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Spec
Consumer 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. 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, Ta = 25°C), ±18 mV (VSET < 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 0.5 A, 1 A Driver ON-resistance Pch: Typ. 0.175 Ω, Nch; Typ. 0.155 Ω (RP509Z)
Pch: Typ. 0.195 Ω, Nch: Typ. 0.175 Ω (RP509N)Oscillator Frequency Typ. 6 MHz Maximum Duty Cycle Min. 100% Package WLCSP-6-P6, SOT-23-6 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)
CIN: 4.7 µF
COUT: 10 µF
L: 0.47 µH -
Typical Application (Adjustable Output Voltage Type)
CIN: 4.7 µF
COUT: 10 µF
L: 0.47 µH -
Efficiency vs. Output Current VOUT=1.8V, VMODE = "L" PWM/VFM Auto Switching
VOUT=1.8V VMODE = "L"
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Efficiency vs. Output Current VOUT=3.3V Fixed, VMODE = "L" PWM/VFM Auto Switching
VOUT=3.3V VMODE = "L"
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Related Links
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Quality &
PackagesProduct Name Compatibility Package Marking Reliability RP509Zxxxx-E2-F WLCSP-6-P6 See datasheet RP509Z-F RP509Nxxxx-TR-FE SOT-23-6 See datasheet RP509N-FE - 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 |