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R1240x Series

1.2A, 30V Step Down DC/DC converter

Outline

The R1240x series are CMOS based Step down DC_DC converter. It has internal Nch high side Tr.(350m ohm Typ.) and can provide Maximum 1.2A output current. It consists of an Oscillator, a PWM control circuit, a Reference Voltage unit, an Error amplifier, phase compensation circuits, a slope circuit, a soft-start circuit, protection circuits, internal voltage regulators, a switch for boot strap circuit and so on.

The R1240x series are current mode operating type DC_DC converter which does not require external current sense resistor, and it works high speed response time, high efficiency and compatible with ceramic capacitors. Operating frequency is internally set at 1.25MHz.

As a protection function it has cycle by cycle peak current limit function, short protection function ( * ver. A or ver. B), thermal shutdown function and UVLO.

* Ver. A : Latch type. After detect the over current condition , if output voltage is keep low more than latch timer period the R1240x will be latched to OFF.
* Ver. B : Fold back protection Type. Keep operating at short condition with lower operating frequency and limiting the Lx current.

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Features

Operating Voltage

4.5V~30V

Internal Nch MOSFET Driver

Ron=350mΩ Typ.

Adjustable output voltage with external resistor

0.8V~15V

Feed back voltage

0.8V±1.5%

Peak Current limit function

2.0A Typ.

UVLO function

Operating Frequency

1.25MHz ( 310kHz : fold condition :Ver.B only)

Short protection for output

Ver.A: Latch with 2ms delay or Ver.B: Fold Back

Ceramic Capacitor compatible

Stand-by function

0μA Typ.

Package

SOT-23-6W, DFN(PLP)2527-10

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Applications

	Power source for digital home appliance
	Power source for hand-held communication equipment, cameras, video instruments such as VCRs,camcorders.
	Power source for battery-powered equipment.
	Battery Charger

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Documents Download

Data Sheet (PDF)	Package Info. (PDF)	Mark Info. (PDF)	Quality Assurance Data (PDF)
R1240x Series EA-190-080331(351KB)	SOT-23-6W	to be prepared	to be prepared
R1240x Series EA-190-080331(351KB)	DFN(PLP)2527-10	to be prepared	to be prepared