SUPER LOW ON RESISTANCE / LOW VOLTAGE 1A LDO
The R1172x Series are CMOS-based positive voltage regulator ICs. The R1172x Series
have features of super low dropout, 1A output current capability. 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 R1172x 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 of R1172 is fixed in the IC.
Since the packages for these ICs are SOT-23-5, SOT-89-5, HSON-6, and HSOP-6J with high power dissipation, high density mounting
of the ICs on boards is possible. |
|
 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 |
Stepwise setting with a step of 0.1V in the range of 0.8V to 5.0V |
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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 |
Typ. ±100ppm/°C |
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| Line
Regulation |
Typ. 0.05%/V |
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| Load
Regulation |
Typ. 15mV at IOUT=300mA, Typ. 50mV at IOUT=1A |
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| Packages |
SOT-23-5, SOT-89-5, HSON-6, HSOP-6J |
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| Built-in
Inrush current limit circuit |
Typ. 500 mA |
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| Built-in
Fold-Back Protection Circuit |
Typ. 250mA (Current at short mode) |
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| Built-in
Thermal Shutdown Circuit |
Thermal Shutdown Temperature ; Typ. 150°C
Released Temperature ; Typ. 120°C |
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| Built-in
Auto Discharge Function |
D version |
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| Output
capacitors |
CIN=COUT=Tantalum 4.7µF (VOUT < 1.0V)
CIN=COUT=Ceramic 4.7µF (VOUT ≥ 1.0V) |
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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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R1172x
Series
