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RP901 Series
PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier Equipped with VR and VD
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.
Specs & Datasheets
| 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 mA |
| Driver ON-resistance | Typ. Pch 0.25 Ω, Nch 0.25 Ω (VIN = 5 V) |
| Oscillator Frequency | Typ. 1.2 MHz |
| Package | DFN(PLP)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 Documents
RP901K Efficiency vs. Output Current
Quality & Packages
| Product Name | Compatibility | Package | Marking | Reliability |
|---|---|---|---|---|
| RP901Kxxxx-TR |
|
DFN(PLP)2527-10 | RP901K | RP901K |
C
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 |