R1172x Series
Super Low On Resistance / Low Voltage 1 A LDO for Automotive Applications
NO. EC-122-140219
OUTLINE
The R1172x is a CMOS-based positive voltage regulator IC that is specifically designed for automotive
applications. The R1172x has 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. 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 this IC are SOT-23-5, SOT-89-5, and HSOP-6J with high power dissipation, high
density mounting of the ICs on boards is possible.
FEATURES
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Input Voltage Range (Maximum Rating) .................... 1.4V to 6.0V (6.5V)
Output Current ............................................................ 1A
Supply Current ............................................................. Typ. 60μA
Standby Current .......................................................... Typ. 0.1μA
Output Voltage.............................................................. 0.8V to 5.0V (0.1V step)
(
For other voltages, refer to
SELECTION GUIDE).
Dropout Voltage............................................................ Typ. 0.32V (V
SET
=
1.5V, I
OUT
=1A)
Typ. 0.18V (V
SET
=
2.8V, I
OUT
=1A)
Ripple Rejection ........................................................... Typ. 70dB (V
SET
=
2.8V)
Output Voltage Accuracy..............................................
±2.0%
Output Voltage Temperature Coefficient ...................... Typ.
±100ppm/°C
Line Regulation ............................................................ Typ. 0.05%/V
Load Regulation ........................................................... Typ. 15mV at I
OUT
=300mA,
Typ. 50mV at I
OUT
=1A
Output Noise ................................................................ 30
μVrms
Packages .................................................................... SOT-23-5, SOT-89-5, HSOP-6J
Built-in Inrush current limit circuit ............................... Typ. 500 mA
Built-in Fold-Back Protection Circuit ........................... Typ. 250mA (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 ....................................................... C
IN
=C
OUT
=Tantalum
4.7μF (V
OUT
< 1.0V)
C
IN
=C
OUT
=Ceramic
4.7μF (V
OUT
≥1.0V)
T
T
T
APPLICATIONS
•
Power source for car accessories including car audio equipment, car navigation system, and ETC system.
1
R1172x
NO. EC-128-140219
BLOCK DIAGRAMS
R1172xxxxB
R1172xxxxD
V
DD
V
OUT
V
DD
V
OUT
Vref
Current Limit
Thermal Shutdown
Vref
Current Limit
Thermal Shutdown
CE
GND
CE
GND
SELECTION GUIDE
The output voltage, chip-enable polarity, auto discharge function
*1
, and package for the ICs can be selected at
the user’s request.
Product Name
R1172Nxx1∗(y)-TR-#E
R1172Hxx2∗(y)-T1-#E
R1172Sxx2∗(y)-E2-#E
Package
SOT-23-5
SOT-89-5
HSOP-6J
Quantity per Reel
3,000 pcs
1,000 pcs
1,000 pcs
Pb Free
Yes
Yes
Yes
Halogen Free
Yes
Yes
Yes
xx : The set output voltage (V
SET
) 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
#: Specify the automotive class code.
Operating
Temperature Range
−40°C
to 85°C
−40°C
to 85°C
Guaranteed Specs
Temperature Range
25°C
25°C
Screening
High temperature
High and low temperature
A
H
Automotive class code (A, H) varies depending on the products.
Product Name
R1172Nxx1∗(y)-TR-#E
R1172Hxx2∗(y)-T1-#E
R1172Sxx2∗(y)-E2-#E
*1
Automotive Class Code
A
H
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.
2
R1172x
NO. EC-128-140219
ABSOLUTE MAXIMUM RATINGS
Symbol
V
IN
V
CE
V
OUT
Input Voltage
Input Voltage (CE Input Pin)
Output Voltage
SOT-23-5
P
D
Power
Dissipation
*1
SOT-89-5
HSOP-6J
Tj
T
stg
*1
Item
Rating
6.5
−0.3
to 6.5
−0.3
to V
IN
+0.3
Unit
V
V
V
Standard Land Pattern
Standard Land Pattern
High Wattage Land Pattern
Standard Land Pattern
Ultra High Wattage Land Pattern
420
900
1300
1700
2700
−40
to 125
−55
to 125
mW
Junction Temperature
Storage Temperature Range
°C
°C
Refer to
PACKAGE INFORMATION
for detailed information.
ABSOLUTE MAXIMUM RATINGS
Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the permanent damages
and may degrade the life time 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 RATINGS
Symbol
V
IN
Ta
Input Voltage
Operating Temperature Range
RECOMMENDED OPERATING RATINGS
All of electronic equipment should be designed that the mounted semiconductor devices operate within the
recommended operating ratings. The semiconductor devices cannot operate normally over the recommended operating
ratings, even if when they are used over such ratings by momentary electronic noise or surge. And the semiconductor
devices may receive serious damage when they continue to operate over the recommended operating ratings.
Item
Rating
1.4 to 6.0
−40
to 85
Unit
V
°C
4
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