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Número de pieza R1245x00xG
Descripción 30 V Step Down DC/DC Converter
Fabricantes Richo 
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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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R1245x00xG pdf
R1245x
NO. EC-269-140311
ABSOLUTE MAXMUM RATINGS
Symbol Item
VIN Input Voltage
VBST BST Pin Voltage
VLX LX Pin Voltage
VCE CE Pin Input Voltage
VFB Feedback Pin Voltage
Power Dissipation
PD (Ultra High Wattage Land Pattern)*1
HSOP-8E 3600
Power Dissipation (Standard Land Pattern)*1 DFN2020-8
Tj Junction Temperature
Tstg Storage Temperature Range
*1 Refer to PACKAGE INFORMATION for detailed information.
Rating
0.3 to 32
VLX - 0.3 to VLX + 6
0.3 to VIN + 0.3
0.3 to VIN + 0.3
0.3 to 6
(GND = 0 V)
Unit
V
V
V
V
V
1100
40 to 150
55 to 150
mW
°C
°C
ABSOLUTE MAXIMUM RATINGS
Electronic and mechanic al stress momentaril y exceeded absolute ma ximum ratings ma y cause the perma nent
damages and may degrade the lifetime and safety for both device and system using the device in the field.
The functional operation at or over these absolute maximum ratings is not assured.
RECOMMENDED OPERATING CONDITIONS
Symbol Item
VIN
Ta
Input Voltage
Operating Temperature Range
Rating
4.5 to 30
40 to 105
Unit
V
°C
RECOMMENDED OPERATING CONDITIONS
All of electronic equipment should be designed that the mounted semiconductor devices operate within the
recommended operating conditions. The semiconductor devices cannot operate normally over the recommended
operating conditions, even if when they are used over such conditions by momentary electronic noise or surge. And the
semiconductor devices may receive serious damage when they continue to operate over the recommended operating
conditions.
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R1245x00xG arduino
R1245x
NO. EC-269-140311
TECHNICAL NOTES
*External components must be connected as close as possible to the ICs and make wiring as short as possible.
Especially, the capacitor connected in between VIN pin and GND must be wiring the shortest. If their impedance is
high, internal voltage of the IC may shift by the swit ching current, and the operating may be unstable. Make the
power supply and GND lin es sufficient. In the wiring of the power sup ply, GND, LX, VOUT and the inductor, large
current by switching may flow. To avoid the bad influence, the wiring between the resistance, “RUP” for setting the
output voltage and loading, and the wiring between the inductor and loading must be separated.
*The ceramic capacitors have low ESR (Equivalent Series Resistance) and recommended for the ICs. The
recommendation of CIN capacitor between VIN and GND is 10 μF or more for A/B/C/D version, 4.7 μF or more for
E/F version, and 2.2 μF or more for G/H version. Verify the bias dependence and the temperature characteristics
of the ceramic capacitors. Recommendation conditions are written based on the case which the
recommendation parts are used with the R1245x.
*The R1245x is designed with the recommendation inductance value and ceramic capacitor value and phase
compensation has been made. If the inductance value is large, due to the lack of current sensing amount of the
current mode, unstable operation may result. On the contrary, if the inductance value is small, the current
sensing amount may increase too much, low frequency oscillation may occur when the on duty ratio is beyond
50%. Not only that, if the inductance value is small, according to the increase of the load current, the peak
current of the switching may increase, as a result, the current may reach the current limit value and the current
limit may work.
*As for the diode, use the Schottky diode with small capacitance between terminals. The reference characteristic
of the capacitance between terminals is around 100 pF or less at 10 V. If the capacitance between terminals is
large, excess switching current may flow and the operation of the IC may be unstable. If the capacitance
between terminals of the Schottky diode is beyond 100 pF at 10 V or unknown, verify the load regulation, line
regulation, and the load transient response.
*Output voltage can be set by adjustment of the values of R1 and R2. The equation of setting the output voltage
is VOUT = VFB × (R1 + R2)/R2. If the values of R1 and R2 are large, the impedance of FB pin increases, and
pickup the noise may result. The recommendation value range of R2 is approximately between 1.0 kto 16 k.
If the operation may be unstable, reduce the impedance of FB pin.
*For the CE pin, as an ESD protection element, a diode to VIN pin is formed internal of the IC. If CE pin voltage
may become higher than VIN pin voltage, to prevent flowing large current from CE pin to VIN pin, connect 10 kΩ or
more resistor between CE and VIN pin.
*Connect the backside heat radiation tab to the GND. As for multi-layered boards, to make better power
dissipation, putting some thermal vias on the thermal tab in the land pattern and radiation of the heat to another
layer is effective.
*After the soft-start operation, the latch function is enabled for version A/C/E/G. The latch protection starts the
internal counter when the internal current limit protection circuit detects the current limit. When the internal
counter counts up to the latch timer limit, typically 4 ms, the output is latched off. To reset the latch function,
make the CE pin “L”, or make VIN pin voltage lower than UVLO detector threshold. Then in the case that the
output voltage or FB voltage becomes setting voltage within the latch timer preset time, counter is initialized. If
the slew rate of the power supply is too slow and after the soft-start time, the output voltage does not reach the
set output voltage even if the latch timer preset time is over, the latch function may work unexpectedly.
*After the soft-start operation, fold-back protection function is enabled for version B/D/F/H. The fold-back function
will limit the oscillator frequency if the FB pin voltage becomes lower than typically 0.56 V. For B/D version, the
oscillator frequency will be reduced typically into 170 kHz, for F version, into 250 kHz, for H version, into 400 kHz.
If the slew rate of the power supply is too slow, and even after the soft-start time, the output voltage is still less
than 70% of the set output voltage, or FB pin voltage is less than typically 0.56 V, then this function may work
unexpectedly.
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