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Richo - 30 V Step Down DC/DC Converter

Numéro de référence R1245L003H
Description 30 V Step Down DC/DC Converter
Fabricant Richo 
Logo Richo 





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R1245L003H fiche technique
R1245x Series
AEC-Q100 Grade 2 Certified
1.2 A, 30 V Step Down DC/DC Converter for Automotive Applications
NO. EC-269-140311
OUTLINE
The R1245x is a Step-down DC/DC converter with internal N-channel high side Tr. That is developed with
CMOS process technology. The ON resistance of the built-in high-side transistor is 0.35 Ω 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 and DFN2020-8 are available.
FEATURES
Input Voltage Range (Maximum Rating) ················ 4.5 V to 30 V (32 V)
Operating Temperature ······································ 40°C to 105°C
Internal N-channel MOSFET Driver ······················ RON = 0.35 Ω Typ.
Adjustable Output Voltage with External Resistor····· 0.8 V or more
Feedback Voltage and Tolerance ························· 0.8 V±1.0%
Peak Current Limit ············································ Typ. 2.0 A
UVLO Function Released Voltage ························ Typ. 4.0 V
Operating Frequency········································· 330 kHz (A/B version), 500 kHz (C/D version),
1000 kHz (E/F version), 2400 kHz (G/H version)
Fold-back Protected Frequency ··························· 170 kHz (B/D version), 250 kHz (F version),
400 kHz (H version)
Latch Protection Delay Time ······························· Typ. 4 ms for A/C/E/G version
Built-in Thermal Shutdown Circuit ························ Typ. 160°C
Ceramic Capacitors Recommended for Input and Output
Stand-by Current ·············································· Typ. 0 μA
Packages ······················································· HSOP-8E, DFN2020-8
AEC-Q100 Certified Product Package Type············ HSOP-8E
APPLICATIONS
Power source for car accessories including car audio equipment, car navigation system, and ETC system.
Power source for control units including EV inverter and charge control.
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