Super low on resistance/Low voltage LDO
The R1173x Series are CMOS-based positive voltage regulator ICs. The R1173x Series have features of
super low dropout, 1A output current capability, and -3mV typical load regulation at 1A. Even the output voltage
is set at 1.5V, on resistance of internal FET is typically 0.32Ω. Therefore, applications that require a large current
at small dropout are suitable for the R1173x series. Low input voltage is acceptable and low output voltage can
be set. The minimum input voltage is 1.4V, and the lowest set output voltage is 0.8V. Each of these ICs consists
of a voltage reference unit, an error amplifier, resistor net for setting output voltage, a current limit circuit at
over-current, a chip enable circuit, a thermal-shutdown circuit, and so on. A stand-by mode with ultra low
consumption current can be realized with the chip enable pin. The output voltage types of R1173 are fixed one in
the IC and adjustable one (R1173x001x).
Since the packages for these ICs are the SOT-89-5 package, HSON-6, or HSOP-6J, high density mounting of
the ICs on boards is possible. |
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 Output Current |
1A |
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| Supply Current |
Typ. 60µA |
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| Standby Current |
Typ. 0.1µA |
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| Input Voltage Range |
1.4V to 6.0V |
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| Output Voltage Range(R1173xxx1) |
0.8V to 5.0V |
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| Output Voltage Range(R1173x001) |
1.0V to VIN |
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| Dropout Voltage |
Typ. 0.32V (VOUT=1.5V,IOUT=1A)
Typ. 0.18V (VOUT=2.8V,IOUT=1A) |
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| Ripple Rejection |
Typ. 70dB (VOUT=2.8V) |
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| Output Voltage Accuracy |
±2.0% |
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Temperature-drift Coefficient of Output Voltage |
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Typ. ±100ppm/°C |
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| Line Regulation |
Typ. 0.05%/V |
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| Load Regulation |
Typ. −2mV (IOUT=300mA)
Typ. −3mV (IOUT=1A) |
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| Packages |
SOT-89-5, HSON-6, HSOP-6J |
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| Low inrush current at turning-on |
Typ. 500mA |
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| Built-in Current Limit Circuit |
Typ. 250mA |
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| Output capacitors |
CIN=Ceramic 4.7µF
COUT=Tantalum 4.7µF(VOUT<1.0V)
COUT=Ceramic 4.7µF(VOUT ≥ 1.0V) |
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| Built-in Thermal Shutdown Circuit |
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Local Power source for Notebook PC.
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Local Power source for portable communication equipments,
cameras, and videos. |
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Local Power source for home appliances. |
| * All PDF files are less than 1MB unless otherwise stated. |
| * If you don't have Adobe Reader, you can download free. |
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Technical Info.
Technical Information on Ricoh Power Management ICs.
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Product Catalog
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| Selection guide is available for download in PDF format. |
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R1173x
Series
