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R1172 Series
Low Voltage 1A Voltage Regulator (LDO Regulator)

Product Specifications

The R1172 Series are CMOS-based LDO regulators featuring 1A output. The CMOS process provides both high output current and low supply current. The dropout voltage is significantly lower than bipolar regulators. The R1172 handles low voltage with an input voltage from 1.4V and output voltage from 0.8V. Accordingly, the device supports highly integrated, low voltage-driven LSI as a rear stage of the DC/DC converter. The CE pin can switch the regulator into standby mode. In addition to a fold-back protection circuit built into conventional LDO regulators, R1172 has a thermal shutdown circuit and inrush current limit circuit.

FEATURES

  Consumer Automotive
Input Voltage Range (Maximum Rating) 1.4 V to 6.0 V (6.5V)
Operating Temperature Range -40°C to 85°C
Output Current 1 A
Supply Current Typ. 60 µA
Standby Current Typ. 0.1 µA
Output Voltage 0.8 V to 5.0 V (0.1V step)
Dropout Voltage Typ. 0.32 V (VSET=1.5V, IOUT=1A)
Typ. 0.18 V (VSET=2.8V, IOUT=1A)
Ripple Rejection Typ. 70 dB (VSET=2.8V)
Output Voltage Accuracy ±2.0%
Output Voltage Temperature Coefficient Typ. ±100 ppm/°C
Line Regulation Typ. 0.05%/V
Load Regulation Typ. 15 mV at IOUT=300mA, Typ. 50 mV at IOUT=1A
Output Noise 30 µVrms
Packages SOT-23-5, SOT-89-5, HSON-6, HSOP-6J SOT-23-5, SOT-89-5, HSOP-6J
Built-in Inrush current limit circuit Typ. 500 mA
Built-in Fold-Back Protection Circuit Typ. 250 mA (Current at short mode)
Built-in Thermal Shutdown Circuit Thermal Shutdown Temperature: Typ. 150°C
Released Temperature: Typ. 120°C
Built-in Auto Discharge Function R1172xxxxD
Output capacitors CIN=COUT=Tantalum 4.7µF (VOUT < 1.0V)
CIN=COUT=Ceramic 4.7µF (VOUT≥1.0V)

APPLICATION INFORMATION

C1,C2: 4.7µF or more

TYPICAL CHARACTERISTICS

R1172x301x Dropout Voltage vs. Output Current

PIN DESCRIPTION

SOT-23-52.9 mm × 2.8 mm

SOT-23-5

1 VOUT
2 GND
3 VDD
4 NC
5 CE or CE
SOT-89-54.5 mm × 4.35 mm

SOT-89-5

1 CE or CE
2 GND**
3 NC (Consumer)
GND** (Automotive)
4 VDD
5 VOUT

**) The GND pin must be wired each other when it is mounted on board.

HSON-62.9 mm × 3.0 mm

HSON-6

1 VOUT**
2 VOUT**
3 CE or CE
4 GND
5 VDD**
6 VDD**

*) The tab and tab suspension leads on back side are substrate level (GND).
**) The VOUT pin and VDD pin must be wired each other when it is mounted on board.

HSOP-6J5.02 mm × 6.0 mm

HSOP-6J

1 VOUT
2 GND**
3 CE or CE
4 NC (Consumer)
GND** (Automotive)
5 GND**
6 VDD

**) The GND pin must be wired each other when it is mounted on board.


R1172 Series for Consumer

APPLICATIONS

  • Local Power source for Notebook PC
  • Local Power source for portable communication equipments, cameras, and VCRs
  • Local Power source for home appliancess

PRODUCT LONGEVITY PROGRAM

R1172N, R1172H and R1172S operate PRODUCT LONGEVITY PROGRAM.
This program has been introduced to help customers select the most appropriate part for applications that require long life cycles.


SELECTION GUIDE

The output voltage, chip-enable polarity, auto discharge function, and package for the ICs can be selected at the user’s request.

Product Name   Package Quantity per Reel
R1172Nxx1#-TR-FE ConsumterPLP SOT-23-5 3,000
R1172Hxx1#-T1-FE ConsumterPLP SOT-89-5 1,000
R1172Dxx1#-TR-FE Consumter HSON-6 3,000
R1172Sxx1#-E2-FE
ConsumterPLP HSOP-6J 1,000
  • xx … The output voltage can be designated in the range from 0.8V(08) to 5.0V(50) in 0.1V steps.
  • # … CE pin polarity and auto discharge function at off state are options as follows.
    A: "L" active, without auto discharge function at off state
    B: "H" active, without auto discharge function at off state
    D: "H" active, with auto discharge function at off state

* Auto-discharge function quickly lowers the output voltage to 0V by releasing the electrical charge accumulated in the external capacitor when the chip enable signal is switched from the active mode to the standby mode.

DOCUMENT/CONTACT

Purchase

Technical Support

Package *1 Marking Reliability *2
SOT-23-5 R1172N R1172N (-FE)
SOT-89-5 R1172H R1172H (-FE)
HSON-6 R1172D R1172D (-FE)
HSOP-6J R1172S R1172S (-FE)

*1: The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and land pattern (foot pattern).
*2: Reliability file includes a reliability test report and a reflow profile.


R1172 Series for Automotive

Ricoh is committed to providing a semiconductor device with the highest level of quality and reliability by restricting the device manufacturing only within Ricoh and the cooperative companies successfully passed our stringent inspections for automotive products. Ricoh established a traceability system and manages manufacturing information and logistics information from the warehouse.


Quality Ranks for Applications

Ricoh offers three different quality ranks for automotive products according to their application purposes.
R1172 Series offer products in Rank 2 and Rank 3.

Rank 2: Automotive General Equipments (Body System)

  • Power source for automotive general equipments such as electric window, side mirror, and around view camera

Rank 3: Automotive Accessories

  • Power source for car accessories such as car audio equipment, car navigation system, and ETC system

PRODUCT LONGEVITY PROGRAM

R1172N, R1172H and R1172S operate PRODUCT LONGEVITY PROGRAM.
This program has been introduced to help customers select the most appropriate part for applications that require long life cycles.


SELECTION GUIDE

The output voltage, chip-enable polarity, auto discharge function, and package for the ICs can be selected at the user’s request.

Product Name   Package Quantity per Reel
R1172Nxx1#(y)-TR-HE AutomotiveAutomotive General EquipmentsPLP SOT-23-5 3,000
R1172Hxx2#(y)-T1-HE AutomotiveAutomotive General EquipmentsPLP SOT-89-5 1,000
R1172Hxx2#(y)-T1-AE AutomotiveAutomotive AccessoriesPLP
R1172Sxx2#(y)-E2-AE AutomotiveAutomotive AccessoriesPLP HSOP-6J 1,000
  • xxx … The set output voltage (VSET) can be designated in the range from 0.8V(08) to 5.0V(50) in 0.1V step.
  • (y) … If the set output voltage includes the third digit, indicate the digit of 0.01 (1.25 V, 1.85 V, 2.85 V).
    Ex.
    If the set output voltage is 1.25 V: R1172x121x5, R1172x122x5
    If the set output voltage is 1.85 V: R1172x181x5, R1172x182x5
    If the set output voltage is 2.85 V: R1172x281x5, R1172x282x5
  • # … Options of the auto discharge function at off state are as follows.
    B: Active-high
    D: Active-high with auto discharge function at off state

* Auto-discharge function quickly lowers the output voltage to 0V by releasing the electrical charge accumulated in the external capacitor when the chip enable signal is switched from the active mode to the standby mode.

DOCUMENT/CONTACT

Purchase

Technical Support

Package*1 Reliability*2
SOT-23-5 R1172N (-HE) *3
SOT-89-5 R1172H (-HE) *3
R1172H (-AE)
HSOP-6J R1172S (-AE)

*1: The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and land pattern (foot pattern).
*2: Reliability file includes a reliability test report and a reflow profile.
*3: The reliability information is not listed for devices above rank2. Please contact Ricoh sales representatives for further informations.

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