600mA*1 Step-down DC/DC Converter with Synchronous Rectifier
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
Temperature-Drift Coefficient of Feedback Voltage
|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|
- •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|
|Package Info.||Mark Info.||Quality Assurance Data|
|to be prepared|
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