R1242 Series

3A 30V Input PWM Step-down DC/DC Converter with Synchronous Rectifier Ext. Low-side Tr.

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Description

The R1242 Series are 30V input, CMOS-based PWM step-down DC/DC converters featuring 3A* output current. R1242 includes a soft start circuit and a latch or fold-back protection circuit. By simply using an inductor, resistors, a low side switch (FET), and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. Due to current mode PWM control, the R1242 provides a fast response and high efficiency.

*) This is an approximate value, because output current depending on conditions and external parts.

Spec

	Consumer
Input Voltage Range	5.0 V to 30.0 V (32.0 V)
Operating Temperature Range	-40°C to 85°C (125°C)
Supply Current	Typ. 800 µA (VIN = 30 V, SET VFB = 1.0 V)
Standby Current	Typ. 0 µA (VIN = 30 V, CE = “L”)
Output Voltage Range	Externally Adjustable: 0.8 V to 15.0 V
Feedback Voltage	0.8 V
Feedback Voltage Accuracy	±12 mV
Output Current	3 A
Oscillator Frequency	Externally Adjustable(Ver.A/B): 330 kHz to 1 MHz 330 kHz (C/D), 500 kHz (E/F), 1 MHz (G/H)
Maximum Duty Cycle	Typ. 88%
Package	HSOP-8E

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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
R1242S001x-E2-FE		HSOP-8E	R1242S	R1242S-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.

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