描述 Description

■OUTLINE
?The R1230D Series are PWM step-down DC/DC Converters with synchronous rectifier, low supply current by CMOS process. Each of these ICs consists of an oscillator, a PWM control circuit, a reference voltage unit, an error amplifier, a soft-start circuit, protection circuits, a protection against miss operation under low voltage (UVLO), PWM/VFM alternative circuit, a chip enable circuit, and a driver transistor.■FEATURES
●Built-in Driver ON Resistance
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? ?P-channel 0.35?, N-channel 0.45?(at VIN=3V)
●Built-in Soft-start Function (TYP. 1.5ms), and Latch-type Protection Function (Delay Time; TYP. 1.5ms)
●Two choices of Oscillator Frequency
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? ?500kHz, 800kHz
●PWM/VFM alternative with MODE pin
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? ?PWM operation; MODE pin at “L”,
VFM operation; MODE pin at “H”
●High Efficiency
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? ?TYP. 90%
●Output Voltage
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? ?Stepwise Setting with a step of 0.1V in the range of 1.2V ～4.0V(XX1A/B Type)
or adjustable in the range of 0.8V to VIN(001C/D Type)
●High Accuracy Output Voltage
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? ?±2.0%(XX1A/B Type)
●Package
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? ?SON8 (Max height 0.9mm, thin type)■APPLICATIONS
●Power source for portable equipment.

特性 Features

●Built-in Driver ON Resistance
?
?
?
?
?
?
?
?
?
?
?
? ?P-channel 0.35?, N-channel 0.45?(at VIN=3V)
●Built-in Soft-start Function (TYP. 1.5ms), and Latch-type Protection Function (Delay Time; TYP. 1.5ms)
●Two choices of Oscillator Frequency
?
?
?
?
? ?500kHz, 800kHz
●PWM/VFM alternative with MODE pin
?
?
?
?
? ?PWM operation; MODE pin at “L”,
VFM operation; MODE pin at “H”
●High Efficiency
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
? ?TYP. 90%
●Output Voltage
?
?
?
?
?
?
?
? ?Stepwise Setting with a step of 0.1V in the range of 1.2V ～4.0V(XX1A/B Type)
or adjustable in the range of 0.8V to VIN(001C/D Type)
●High Accuracy Output Voltage
?
?
?
?
?
?
?
?
? ?±2.0%(XX1A/B Type)
●Package
?
?
?
? ?SON8 (Max height 0.9mm, thin type)■