R1172x SERIES
SUPER LOW ON RESISTANCE / LOW VOLTAGE 1A LDO
NO.EA-122-070627
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.............................................................. Stepwise setting with a step of 0.1V in the range of
0.8V to 5.0V (Exceptions: HSOP-6J
=
0.8V to 3.5V)
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
GND
R1172xxx1B
V
DD
V
OUT
R1172xxx1D
V
DD
V
OUT
Vref
Current Limit
Thermal Shutdown
Vref
Current Limit
Thermal Shutdown
CE
GND
CE
GND
SELECTION GUIDE
The output voltage, auto discharge function*, and the package type for the ICs can be selected at the user’s
request. The selection can be made with designating the part number as shown below;
R1172xxx1x-xx-x
←Part
Number
↑ ↑
a b
Code
a
↑ ↑ ↑
c d e
Contents
Designation of Package Type;
N: SOT-23-5, H: SOT-89-5, D: HSON-6, S: HSOP-6J
Setting Output Voltage (V
OUT
);
Stepwise setting with a step of 0.1V in the range of 0.8V to 5.0V (HSOP-6J : 0.8V to 3.5V)
is possible.
Exceptions; 1.85V output: R1172x181x5-xx-x, 2.85V output: R1172x281x5-xx-x
Designation of option;
A: active low, without auto discharge function*
B: active high, without auto discharge function*
D: active high, with auto discharge function*
Designation of Taping Type;
T1 (SOT-89-5), TR (SOT-23-5, HSON-6), E2 (HSOP-6J) Refer to Taping Specifications.
Designation of composition of pin plating;
-F: Lead free plating
b
c
d
e
*) When the mode is into standby with CE signal, auto discharge transistor turns on, and it makes the turn-off
speed faster than normal type.
2
R1172x
PIN CONFIGURATIONS
SOT-23-5
5
4
SOT-89-5
5
4
(mark side)
1
2
3
1
2
3
HSON-6
Top View
6
5
4
HSOP-6J
6
5
4
Bottom View
4
5
6
∗
∗
∗
1
2
3
3
2
1
1
2
3
PIN DESCRIPTIONS
•
SOT-23-5
Pin No.
1
Symbol
V
OUT
Description
Voltage Regulator Output Pin
•
SOT-89-5
Pin No.
1
Symbol
CE
or CE
Description
Chip Enable Pin
Ground Pin
No Connection
Input Pin
2
3
4
5
GND
V
DD
NC
CE
or CE
Ground Pin
Input Pin
No Connection
2
3
4
GND
NC
V
DD
Chip Enable Pin
5
•
HSOP-6J
V
OUT
Voltage Regulator Output Pin
•
HSON-6*
1
Pin No.
1
2
3
Symbol
V
OUT
*
2
V
OUT
*
2
CE
or CE
Description
Voltage Regulator Output Pin
Voltage Regulator Output Pin
Pin No.
1
2
Symbol
V
OUT
GND
CE
or CE
Description
Voltage Regulator Output Pin
Ground Pin
Chip Enable Pin
3
Chip Enable Pin
No Connection
Ground Pin
Input Pin
4
5
6
GND
V
DD
V
DD
Ground Pin
Input Pin
Input Pin
4
5
6
NC
GND
V
DD
*1) Tab in the
parts have GND level. (They are connected to the reverse side of this IC.)
Do not connect to other wires or land patterns.
*2) Connect Pin1 and Pin2 as short as possible.
3
R1172x
ABSOLUTE MAXIMUM RATINGS
Symbol
V
IN
V
CE
V
OUT
I
OUT
Item
Input Voltage
Input Voltage (
CE
or CE Input Pin)
Output Voltage
Output Current
Power Dissipation (SOT-23-5) *
Rating
6.5
−0.3
to 6.5
−0.3
to V
IN
+0.3
1.4
420
900
900
1700
−40
to 85
−55
to 125
Unit
V
V
V
A
P
D
Power Dissipation (SOT-89-5) *
Power Dissipation (HSON-6) *
Power Dissipation (HSOP-6J) *
mW
T
opt
T
stg
Operating Temperature Range
Storage Temperature Range
°C
°C
*) For Power Dissipation, please refer to PACKAGE INFORMATION to be described.
(Includes additional information of High Wattage Land Pattern)
4
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