600mA*1 Step-down DC/DC Converter with Synchronous Rectifier

Data Sheet / Flyer
Data Sheet * Flyer

The RP507K001B is a CMOS-based 600mA*1 step-down DC/DC converter with synchronous rectifier. Internally, a single converter consists of an oscillator, a reference voltage unit, an error amplifier, a switching control circuit, a soft-start circuit, an under voltage lockout (UVLO) circuit, an over current protection circuit, a thermal shutdown circuit and switching transistors.

Replacing diodes with built-in switching transistors improves the efficiency of rectification. Therefore, by simply using an inductor, resistors and capacitors as the external components, a low ripple high efficiency synchronous rectifier step-down DC/DC converter can be easily configured.

The RP507K001B has an over current protection circuit which supervises the inductor peak current in each switching cycle, and turns the high-side driver off if the current exceeds the Lx current limit. The RP507K001B also contains a thermal shutdown circuit which detects overheating of the converter and stops the converter operation to protect it from damage if the junction temperature exceeds the specified temperature.

The RP507K001B is PWM/VFM auto switching control in which mode automatically switches from PWM mode to high-efficiency VFM mode in low output current.

The RP507K001B is available in DFN(PLP)1616-6D package which achieves high-density mounting on boards. For an input capacitor (CIN) and an output capacitor (COUT), the smaller sized 0402/1005 (inch/ mm) capacitor can be used. Output voltage is adjustable with external divider resistors.

  • *1 This is an approximate value. The output current depends on conditions and external components.

Input Voltage Range

2.3V to 5.5V (Absolute maximum rating: 6.5V)

Output Voltage Range

0.7V to 5.5V
(Note: As for 1.0V or less, input voltage range is limited.)

Feedback Voltage Accuracy

±9mV (VFB=0.6V)

Temperature-Drift Coefficient of Feedback Voltage

Typ. ±100ppm/°C
Oscillator Frequency Typ. 2.0MHz
Maximum Duty Cycle 100%
Built-in Driver ON Resistance Typ. Pch. 0.38Ω, Nch. 0.3Ω (VIN=3.6V)
Supply Current (at no load) Typ. 34µA
Standby Current Max. 5µA
UVLO Detector Threshold Typ. 2.0V
Soft-start Time Typ. 150µs
LX Current Limit Circuit Typ. 1A
Package DFN(PLP)1616-6D
  • Power source for portable equipment such as cellular, PDA, DSC, Notebook PC, smartphone
  • Power source for Li-ion battery-used equipment

Data Sheet Flyer Design Guide
RP507K001B RP507K001B RP507K001B
Package Info. Mark Info. Quality Assurance Data
DFN(PLP)1616-6D RP507K Reliability

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