RP507 Series

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

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Description

The RP507 is low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier. The RP507 is PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current. The output voltage is adjustable with external divider resistors. The RP507 includes a soft start circuit, an under-voltage lockout circuit (UVLO), thermal shutdown circuit, and an auto-discharge circuit.

By simply using an inductor, capacitors and resistors as external components, a high-efficiency step-down DC/DC converter can be easily configured. A small size inductor (2.0 x 1.2mm, 2.2µH), a small size input capacitor (1.0 x 0.5mm, 4.7µF) and output capacitor (1.0 x 0.5mm, 10µF) can be used. A 1.6mm × 1.6mm DFN(PL)1616-6D package is available.

Spec

	Consumer
Input Voltage Range	2.3 V to 5.5 V (6.5 V)
Operating Temperature Range	-40°C to 85°C (125°C)
Supply Current	Typ. 32 µA
Standby Current	Typ. 0 µA
Output Voltage Range	0.7 V to 5.5 V (As for 1.0 V or less, input voltage range is limited.)
Output Voltage Accuracy	±1.5% (Ta = 25°C)
Feedback Voltage	0.6 V
Feedback Voltage Accuracy	±9 mV
Feedback Voltage Temperature Coefficient	Typ. ±100 ppm/°C
Output Current	600 mA
Driver ON-resistance	Pch: Typ. 0.38 Ω, Nch: Typ. 0.3 Ω (VIN = 3.6 V)
Oscillator Frequency	Typ. 2.0 MHz
Maximum Duty Cycle	100%
Package	DFN(PL)1616-6D

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

Functional Description

Quality &
Packages

Product Name	Compatibility	Package	Marking	Reliability
RP507K001B-TR		DFN(PL)1616-6D	See datasheet	RP507K

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.

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