RP901 Series
PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier Equipped with VR and VD
Download Datasheet
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Description
The RP901 Series are CMOS-based PWM/VFM step-down DC/DC converters equipped with voltage regulator and voltage detector. The DC/DC converter can be selected from two control types - fixed PWM control or PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current.
RP901 was developed for applications that require multiple power supplies such as storage devices. It integrates an 800mA* (A/B/C Version) / 900mA* (D Version) output current step-down DC/DC converter, a 600mA output current LDO regulator, and a voltage detector with a built-in delay circuit into a small package. The regulator can be started after soft start of the DC/DC converter by sequence control. (A/B Version)
*) This is an approximate value, because output current depending on conditions and external parts.
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Spec
Consumer Input Voltage Range 4.5 V to 5.5 V (6.5 V) Operating Temperature Range -40°C to 85°C (125°C) Supply Current Typ. 460 µA (at PWM mode)
Typ. 170 µA (at light load, Ver. B, C, D)Standby Current Typ. 1 µA (Ver. A)
Typ. 2 µA (Ver. B, C, D)Output Voltage Range DC/DC Section: 1.2 V to 1.8 V (0.1 V step)
LDO Section: 2.5 V to 3.3 V (0.1 V step)Output Voltage Accuracy DC/DC Section: ±2% (Ta = 25°C)
LDO Section: ±1.0%Output Current DC/DC Section:
800 mA
900 mA (Ver. D)
LDO Section: 600 mADriver ON-resistance Typ. Pch 0.25 Ω, Nch 0.25 Ω (VIN = 5 V) Oscillator Frequency Typ. 1.2 MHz Package DFN(PL)2527-10 VD Threshold Range 2.0 V to 3.0 V (Ver. A, supervising LDO output voltage)
3.0 V to 5.0 V (Ver. B, C, D, supervising input voltage)VD Threshold Accuracy ±2% Release Delay Time Typ. 50 ms 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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RP901K Efficiency vs. Output Current
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Related Links
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Quality &
PackagesProduct Name Compatibility Package Marking Reliability RP901Kxxxx-TR DFN(PL)2527-10 RP901K RP901K - 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 |