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RP503 Series
600mA PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier

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Description

The RP503 Series are low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier. RP503 is PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current. The efficiency in low output current (VFM mode) improved compared with existing products. RP503 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.

Spec

Standard
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. 20 µA (VFM, no load)
Standby Current Typ. 0 µA
Output Voltage Range 0.8 V to 2.5 V (0.1 V step)
Output Voltage Accuracy ±1.5% (VOUT ≥ 1.2 V, Ta = 25°C)
±18 mV (VOUT < 1.2 V)
Output Voltage Temperature Coefficient ±100 ppm/°C
Output Current 600 mA
Driver ON-resistance Pch: Typ. 0.34 Ω, Nch: 0.43 Ω (VIN = 3.6 V)
Oscillator Frequency Typ. 2 MHz
Maximum Duty Cycle Min. 100%
Package DFN1616-6, SOT-23-5

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Protections / Functions

TSD OCP OVP UVLO OVLO Reverse Shutdown Soft Start SSCG PGOOD Auto Discharge Anti-ringing Sequencing Max Duty Ext. Phase LED Adjust

Functional Description

TSD Thermal Shutdown Function
OCP Overcurrent Protection

Note: The function previously labeled as "ILX (LX Current Limit Function)" is now shown as "OCP."
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

Functional Description

TSD Thermal Shutdown Function
OCP Overcurrent Protection

Note: The function previously labeled as "ILX (LX Current Limit Function)" is now shown as "OCP."
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

Search for similar products under conditions below.

Category:DC/DC Switching Regulators

Topology Buck
VIN
min (V)		 2.5
VIN
max (V)		 5.5
VOUT
min (V)		 0.8
VOUT
max (V)		 2.5
IOUT
(mA)		 600
ISS
(µA)		 20

Technical Documents

  • Typical Application

    Typical Application

  • RP503x25xA Efficiency vs. Output Current

    RP503x25xA Efficiency vs. Output Current

  • Related Links

    • Prime Designer

      Online Design Tool

      Registration to myNISD is required to use some of the functions, such as simulations.

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Quality & Packages

Product Name Compatibility Package Marking Reliability
RP503LxxxA-TR
  • gradeConsumer
 DFN1616-6 RP503L RP503L
RP503NxxxA-TR-FE
  • gradeConsumer
 SOT-23-5 RP503N RP503N-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.

FAQ

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Buy / Contact

  • Purchase, Request for samples and documents
    Sales are made through distributors. Please contact your local distributors for any sales-related inquiry such as price.
  • Available from 1 piece!
    Our electronic device products are available through our authorized online distributors.
  • Technical Support
RP503 Series