R1172x SERIES
SUPER LOW ON RESISTANCE / LOW VOLTAGE 1A LDO
NO.EA-122-130924
OUTLINE
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.
FEATURES
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Output Current ............................................................ 1A
Supply Current ............................................................. Typ. 60μA
Standby Current .......................................................... Typ. 0.1μA
Input Voltage Range ................................................... 1.4V to 6.0V
Output Voltage.............................................................. 0.8V to 5.0V (0.1V steps)
(
For other voltages, please refer to MARK INFORMATIONS.)
Dropout Voltage............................................................ Typ. 0.32V (V
OUT
=1.5V,
I
OUT
=1A)
Typ. 0.18V (V
OUT
=2.8V,
I
OUT
=1A)
Ripple Rejection ........................................................... Typ. 70dB (V
OUT
=2.8V)
Output Voltage Accuracy ..............................................
±2.0%
Temperature-Drift Coefficient of Output Voltage .......... Typ.
±100ppm/°C
Line Regulation ............................................................ Typ. 0.05%/V
Load Regulation ......................................................... Typ. 15mV at I
OUT
=300mA,
Typ. 50mV at I
OUT
=1A
Packages .................................................................... SOT-23-5, SOT-89-5, HSON-6, 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 ................................ D Version
Output capacitors ....................................................... C
IN
=C
OUT
=Tantalum
4.7μF (V
OUT
< 1.0V)
C
IN
=C
OUT
=Ceramic
4.7μF (V
OUT
>
1.0V)
=
APPLICATIONS
•
Local Power source for Notebook PC.
•
Local Power source for portable communication equipments, cameras, and VCRs.
•
Local Power source for home appliances.
1
R1172x
BLOCK DIAGRAMS
R1172xxx1A
V
DD
V
OUT
Vref
Current Limit
Thermal Shutdown
CE
R1172xxx1B
GND
R1172xxx1D
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, and package for the ICs can be selected at
the user’s request.
Product Name
R1172Nxx1∗-TR-FE
R1172Hxx1∗-T1-FE
R1172Dxx1∗-TR-FE
R1172Sxx1∗-E2-FE
Package
SOT-23-5
SOT-89-5
HSON-6
HSOP-6J
Quantity per Reel
3,000 pcs
1,000 pcs
3,000 pcs
1,000 pcs
Pb Free
Yes
Yes
Yes
Yes
Halogen Free
Yes
Yes
Yes
Yes
xx : The output voltage can be designated in the range from 0.8V(08) to 5.0V(50) in 0.1V steps.
(HSOP-6J : 0.8V to 3.5V)
(For other voltages, please refer to MARK INFORMATIONS.)
∗
: 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
2
R1172x
PIN CONFIGURATIONS
SOT-23-5
5
4
SOT-89-5
5
4
HSON-6
Top View
6
5
4
HSOP-6J
6
5
4
Bottom View
4
5
6
(mark side)
∗
∗
∗
1
2
3
1
2
3
1
2
3
3
2
1
1
2
3
PIN DESCRIPTIONS
•
SOT-23-5
Pin No.
1
2
3
4
5
•
SOT-89-5
Pin No.
1
2
3
4
5
•
HSON-6
Pin No.
1
2
3
4
5
6
Symbol
V
OUT
*
1
V
OUT
*
1
CE
or CE
Symbol
V
OUT
GND
V
DD
NC
CE
or CE
Description
Voltage Regulator Output Pin
Ground Pin
Input Pin
No Connection
Chip Enable Pin
Symbol
CE
or CE
Description
Chip Enable Pin
Ground Pin
No Connection
Input Pin
Voltage Regulator Output Pin
GND
NC
V
DD
V
OUT
Description
Voltage Regulator Output Pin
Voltage Regulator Output Pin
Chip Enable Pin
Ground Pin
Input Pin
Input Pin
GND
V
DD
*
1
V
DD
*
1
∗)
Tab and tab suspension leads in the
parts are GND level.
(They are connected to the reverse side of the IC.)
The tab is better to be connected to the GND, but leaving it open is also acceptable.
The tab suspension leads should be open and do not connect to other wires or land patterns.
∗1)
The V
OUT
pin and V
DD
pin must be wired each other when it is mounted on board.
3
R1172x
•
HSOP-6J
Pin No.
1
2
3
4
5
6
Symbol
V
OUT
GND*
1
CE
or CE
Description
Voltage Regulator Output Pin
Ground Pin
Chip Enable Pin
No Connection
Ground Pin
Input Pin
NC
GND*
1
V
DD
∗1)
The GND pin must be wired together when it is mounted on board.
ABSOLUTE MAXIMUM RATINGS
Symbol
V
IN
V
CE
V
OUT
Input Voltage
Input Voltage (
CE
or CE Input Pin)
Output Voltage
Power Dissipation (SOT-23-5) *
Power Dissipation (SOT-89-5) *
P
D
Power Dissipation (HSON-6) *
Power Dissipation (HSOP-6J) *
T
opt
T
stg
Operating Temperature Range
Storage Temperature Range
900
1700
−40
to 85
−55
to 125
°C
°C
Item
Rating
6.5
−0.3
to 6.5
−0.3
to V
IN
+0.3
420
900
mW
Unit
V
V
V
∗)
For Power Dissipation, please refer to PACKAGE 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 CONDITIONS (ELECTRICAL CHARACTERISTICS)
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.
4
Analog electronics
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