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B82733F2112B001 其他数据使用手册 - TDK（东电化）
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B82733F2112B001数据手册
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RP507K001B
600mA Step-down DC/DC Converter with Synchronous Rectifier
NO.EA-305-170622
1
OUTLINE
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 (C
IN
) and an output capacitor (C
OUT
), the smaller sized 0402/1005 (inch/ mm) capacitor
can be used. Output voltage is adjustable with external divider resistors.
FEATURES
• 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 (V
IN=3.6V)
• Supply Current (at no load) ................................... Typ. 34µA
• Standby Current .................................................... Max. 5µA
• UVLO Detector Threshold ..................................... Typ. 2.0V
• Soft-start Time ....................................................... Typ. 150µs
• L
X Current Limit Circuit .......................................... Typ. 1A
• Package ................................................................ DFN(PLP)1616-6D
(1)
This is an approximate value, because output current depends on conditions and external components.
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