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CMS06 Datasheet(PDF) 1 Page - Nisshinbo Micro Devices Inc. |
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CMS06 Datasheet(HTML) 1 Page - Nisshinbo Micro Devices Inc. |
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1 / 63 page  R1245x Series 1.2 A, 30 V Step-Down DC/DC Converter No. EA-269-240903 1 OUTLINE The R1245x is a CMOS-based Step-down DC/DC converter with internal N-channel high side Tr. The ON resistance of the built-in high-side transistor is 0.35 and the R1245x can provide the maximum 1.2 A output current. Each of the ICs consists of an oscillator, a PWM control circuit, a voltage reference unit, an error amplifier, a phase compensation circuit, a slope compensation circuit, a soft-start circuit, protection circuits, an internal voltage regulator, and a switch for bootstrap circuit. The ICs can make up a step-down DC/DC converter with an inductor, resistors, a diode, and capacitors. The R1245x is a current mode operating type DC/DC converter without an external current sense resistor, and realizes fast response and high efficiency. As an output capacitor, a ceramic type capacitor can be used with the R1245x. The options of the internal oscillator frequency are preset at 330 kHz for version A and B, 500 kHz for version C and D, 1000 kHz for version E and F, 2400 kHz for version G and H. As for protection, an Lx peak current limit circuit cycle by cycle, a thermal shutdown function and an under voltage lockout (UVLO) function are built in. Furthermore, there are two types for short protection, for A/C/E/G version, a latch protection function which makes the output latch off if the output voltage keeps lower than the set output voltage for a certain time after detecting current limit is built in, for B/D/F/H version, a fold-back protection function which changes the oscillator frequency slower after detecting short circuit or equivalent. As for the packages of the R1245x, HSOP-8E, DFN(PL)2020-8, SOT23-6W are available. FEATURES • Operating Voltage ·········································· 4.5 V to 30 V • Internal N-channel MOSFET Driver ······················ Typ. RON = 0.35 • Adjustable Output Voltage with External Resistor ···· 0.8 V or more • Feedback Voltage and Tolerance ························· 0.8 V1.0% • Peak Current Limit············································ Typ. 2.0 A • UVLO Function Released Voltage························ Typ. 4.0 V • Operating Frequency ········································ 330 kHz (Ver. A/B), 500 kHz (Ver. C/D), 1000 kHz (Ver. E/F), 2400 kHz (Ver. G/H) • Fold-back Protected Frequency··························· 170 kHz (Ver. B/D), 250 kHz (Ver. F), 400 kHz (Ver. H) • Latch Protection Delay Time ······························· Typ. 4 ms (Ver. A/C/E/G) • Ceramic Capacitors Recommended for Input and Output. • Stand-by Current·············································· Typ. 0 A • Packages ······················································· SOT-23-6W, DFN(PL)2020-8, HSOP-8E |
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