RP132x SERIES
Low Voltage 1A Voltage Regulator (LDO Regulator)
NO.EA-265-190408
OUTLINE
The RP132x is a voltage-regulator with a built-in low ON-resistance transistor and output current is 1A
capability. This IC has two versions: fixed output voltage type and externally adjustable output voltage type.
The minimum output voltage can be set from 1.4V. Otherwise, the load regulation of RP132x has much
improved when compared with conventional regulators. It's Typ.5mV at IOUT0.1mA to 1A.
This IC consists of a voltage reference unit, an error amplifier, a resistor net for setting output voltage, current
limit circuits to prevent over-current and a thermal-shutdown circuit. A standby mode with ultra low supply
current can be realized with the chip enable function. Additionally, E/F Version with delay pin for inrush current
limit time setting are also available.
The packages for these ICs are DFN(PLP)1820-6, SOT-89-5, HSOP-6J and TO-252-5-P2. DFN(PLP)1820-6
is suitable for high density mounting of the ICs on boards. SOT-89-5, HSOP-6J and TO-252-5-P2 are
supporting high wattage.
FEATURES
Output Current ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Min. 1A
Supply Current ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Typ. 65µA
Standby Current ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Typ. 0.15µA
Input Voltage Range ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ 1.4V to 6.5V
Output Voltage Range ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Fixed Output Voltage Type: 0.8V to 5.5V (0.1V steps)
Adjustable Output Voltage Type: 0.8V to 5.5V
(For other voltages, please refer to MARK INFORMATIONS.)
Dropout Voltage ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Typ. 0.52V (VOUT=2.8V, IOUT=1A)
Ripple Rejection ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Typ. 70dB (f=1kHz, VOUT=2.8V)
Output Voltage Accuracy ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ 1.0%
Output Voltage Temperature-Drift Coefficient ꞏꞏꞏꞏꞏꞏ Typ. 60ppm/C
Line Regulation ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Typ. 0.052%/V
Load Regulation ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Typ. 3mV at IOUT=300mA, Typ. 5mV at IOUT=1A
Packages ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ DFN(PLP)1820-6, SOT-89-5, HSOP-6J,TO-252-5-P2
Inrush Current Limit Circuit ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Typ. 500mA
B/D version: Inrush current limit time is 500s.
E/F version: Inrush current limit time is adjustable.
Fold-Back Protection Circuit ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Typ. 250mA (Current at short mode)
Thermal Shutdown Circuit ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Thermal Shutdown Temperature: Typ. 165C
Released Temperature: Typ. 95C
Auto Discharge Function ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ D, F version
Ceramic capacitors are recommended to be used with this IC ꞏꞏꞏꞏ 2.2F or more (VOUT ≤ 3.6V)
4.7F or more (VOUT 3.6V)
1
RP132x
NO.EA-265-190408
APPLICATIONS
Power source for battery-powered equipment.
Power source for portable communication equipment
Power source for electrical appliances such as cameras, VCRs and camcorders.
Power source for home appliances and Notebook PC.
SELECTION GUIDE
The output voltage, the auto discharge function(1), and the package type for the IC can be selected at the user’s
request.
Product Name
RP132K001-TR
RP132Kxx1-TR
RP132H001-T1-FE
RP132Hxx1-T1-FE
RP132S001-E2-FE
RP132Sxx1-E2-FE
RP132J001-T1-FE
RP132Jxx1-T1-FE
Package
Quantity per Reel
Pb Free
Halogen Free
DFN(PLP)1820-6
5,000 pcs
Yes
Yes
SOT-89-5
1,000 pcs
Yes
Yes
HSOP-6J
1,000 pcs
Yes
Yes
TO-252-5-P2
3,000 pcs
Yes
Yes
RP132x001x is the adjustable output voltage type.
xx: The output voltage can be designated in the range from 0.8V(08) to 5.5V(55) in 0.1V step.
The voltage in 0.05 V step is shown as follows:
Ex. 1.05 V : RP132x101x5
Contact our sales representatives for other voltages.
The combination of the auto discharge function and delay pin (for setting inrush current limit time) are
as follows.
B: without auto discharge function
D: with auto discharge function
E: without auto discharge function, with delay pin (for setting inrush current limit time)
F: with auto discharge function and delay pin (for setting inrush current limit time)
The auto discharge function at off state are options as follows.
B: without auto discharge function at off state
D: with auto discharge function at off state
(1)
Auto-discharge function quickly lowers the output voltage to 0V, when the chip enable signal is switched from the
active mode to the standby mode, by releasing the electrical charge accumulated in the external capacitor.
2
RP132x
NO.EA-265-190408
BLOCK DIAGRAMS
Fixed Output Voltage Type （HSOP-6J / SOT89-5）
RP132Sxx1B / RP132Hxx1B
VDD
RP132Sxx1D / RP132Hxx1D
VOUT
VDD
VOUT
Vref
Vref
Current Limit
Thermal Shutdown
CE
Current Limit
Thermal Shutdown
GND
CE
GND
Fixed Output Voltage Type（TO-252-5-P2 / DFN(PLP)1820-6）
RP132Jxx1B / RP132Kxx1B
VDD
RP132Jxx1D / RP132Kxx1D
VOUT
VDD
VOUT
VFB
VFB
Vref
Vref
Current Limit
Thermal Shutdown
CE
Current Limit
Thermal Shutdown
GND
CE
GND
Fixed Output Voltage Type with DELAY pin（HSOP-6J）
RP132Sxx1E
VDD
RP132Sxx1F
VOUT
VDD
VOUT
Vref
Vref
Current Limit
Thermal Shutdown
CE
Current Limit
Thermal Shutdown
GND
DELAY
CE
GND
DELAY
3
RP132x
NO.EA-265-190408
Fixed Output Voltage Type with DELAY pin（DFN(PLP)1820-6）
RP132Kxx1E
VDD
RP132Kxx1F
VOUT
VDD
VOUT
VFB
VFB
Vref
Vref
Current Limit
Thermal Shutdown
CE
Current Limit
Thermal Shutdown
GND
CE
GND
DELAY
DELAY
Adjustable Output Voltage Type（HSOP-6J / SOT-89-5 / TO-252-5-P2 /DFN(PLP)1820-6）
RP132S001B / RP132H001B /
RP132S001D / RP132H001D /
RP132J001D / RP132K001D
RP132J001B / RP132K001B
VDD
VOUT
VDD
VOUT
VFB
VFB
Vref
Vref
Current Limit
Thermal Shutdown
CE
Current Limit
Thermal Shutdown
GND
CE
GND
Adjustable Output Voltage Type with DELAY pin（DFN(PLP)1820-6）
RP132K001E
VDD
RP132K001F
VOUT
VDD
VOUT
VFB
VFB
Vref
Vref
Current Limit
Thermal Shutdown
CE
GND
DELAY
4
Current Limit
Thermal Shutdown
CE
GND
DELAY
RP132x
NO.EA-265-190408
PIN DESCRIPTIONS
Top View
6
5
Bottom View
4
4
5
6
2
1
5
4
6
5
4
1
2
3
1
2
3
3
1
2
3
1
RP132K
(DFN(PLP)1820-6)
RP132H
SOT-89-5)
RP132S
HSOP-6J)
2
3
4
5
RP132J
(TO-252-5-P2)
RP132K(1) (DFN(PLP)1820-6) Pin Description
Pin No.
Symbol
Pin Description
(2)
1
VOUT
2
VFB
Feed Back Pin(2)
3
GND
Ground Pin
4
CE
Chip Enable Pin ("H" Active)
NC
No Connection (RP132K001B/D, RP132Kxx1B/D)
5
6
DELAY
VDD
Output Pin
Delay Pin for setting inrush current limit time (RP132K001E/F, RP132Kxx1E/F)
Input Pin
Tab is GND level. (They are connected to the reverse side of this IC.) The tab is better to be connected to the GND, but
leaving it open is also acceptable.
(1)
When using Adjustable Output Voltage Type (RP132K001x), please follow "Notes on the Adjustable Output Voltage
Type Settings".
(2)
When using Fixed Output Voltage Type(RP132Kxx1x), the VOUT pin and the VFB pin should be connected.
5
RP132x
NO.EA-265-190408
RP132H(1) (SOT-89-5) Pin Description
Pin No.
1
2
3
Symbol
Pin Description
CE
Chip Enable Pin ("H" Active) (RP132Hxx1B/D)
VFB
Feed Back Pin (RP132H001B/D)
GND
Ground Pin
NC
No Connection (RP132Hxx1B/D)
CE
Chip Enable Pin ("H" Active) (RP132H001B/D)
4
VDD
5
VOUT
Input Pin
Output Pin
RP132S(1) (HSOP-6J) Pin Description
Pin No.
Symbol
1
VOUT
Output Pin
2
GND
Ground Pin(2)
3
Pin Description
NC
No Connection (RP132Sxx1B/D)
VFB
Feed Back Pin (RP132S001B/D)
DELAY
Delay Pin for setting inrush current limit time (RP132Sxx1E/F)
4
CE
Chip Enable Pin ("H" Active)
5
GND
Ground Pin(2)
6
VDD
Input Pin
RP132J(1) (TO-252-5-P2) Pin Description
Pin No.
Symbol
Pin Description
1
CE
2
VDD
Input Pin
3
GND
Ground Pin
4
VOUT
Output Pin(3)
5
VFB
Chip Enable Pin ("H" Active)
Feed Back Pin(3)
Tab is GND level. (They are connected to the reverse side of this IC.) The tab is better to be connected to the GND, but
leaving it open is also acceptable.
(1)
When using Adjstable Output Voltage Type (RP132x001x), please follow "Notes on Adjustable Output Voltage Type
Settings".
(2)
GND pins must be wired each other when mounted on boards.
(3)
When using Fixed Output Voltage Type(RP132Jxx1x),VOUT pin and VFB pin should be connected.
6
RP132x
NO.EA-265-190408
ABSOLUTE MAXIMUM RATINGS
Symbol
Item
Rating
Unit
7.0
V
VIN
Input Voltage
VCE
Input Voltage (CE Pin)
0.3 to 7.0
V
VFB
Input Voltage (VFB Pin)
0.3 to 7.0
V
VOUT
Output Voltage
0.3 to VIN0.3
V
PD
Power Dissipation(1)
DFN(PLP)1820-6, JEDEC STD.51-7
2200
SOT-89-5, JEDEC STD.51-7
2600
HSOP-6J, JEDEC STD.51-7
2700
TO-252-5-P2, JEDEC STD.51-7
3800
mW
Tj
Junction Temperature Range
40 to 125
C
Tstg
Storage Temperature Range
55 to 125
C
ABSOLUTE MAXIMUM RATINGS
Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause permanent damage
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 are not assured.
RECOMMENDED OPERATING CONDITIONS
Symbol
Item
Rating
Unit
VIN
Input Voltage
1.4 to 6.5
V
Ta
Operating Temperature Range
−40 to 85
°C
RECOMMENDED OPERATING CONDITIONS
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 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 conditions.
(1)
Refer to POWER DISSIPATION for detailed information.
7
RP132x
NO.EA-265-190408
ELECTRICAL CHARACTERISTICS
VIN=Set VOUT1.0V, IOUT=1mA, CIN=2.2F, COUT=2.2F (VOUT ≤ 3.6V) / 4.7F(VOUT＞3.6V)
The specification in
is checked and guaranteed by design engineering at −40C ≤ Ta ≤ 85C, unless
otherwise noted.
RP132xxx1B/D(Fixed Output Voltage Type) /
RP132S/Kxx1E/F(Fixed Output Voltage Type with DELAY pin)
Symbol
Item
Conditions
Ta= 25C
VOUT
Output Voltage
40C ≤ Ta ≤ 85C
ILIM
Load Regulation
VDIF
Dropout Voltage
ISS
Supply Current
Istandby Standby Current
0.99
1.01
V
VOUT ≤ 1.5V
15
15
mV
VOUT > 1.5V
0.981
1.019
V
VOUT ≤ 1.5V
29
29
1
mV
A
0.1mA ≤ IOUT ≤ 300mA
3
20
0.1mA ≤ IOUT ≤ 1A
5
60
mV
Refer to the following "Dropout Voltage"
IOUT=0mA (VIN=6.5V)
65
85
µA
VCE=0V, VIN=6.5V
0.15
0.60
µA
0.05
0.10
%/V
VOUT/
VIN
Line Regulation
Set VOUT0.5V ≤ VIN ≤ 6.5V
However, VIN ≥1.6V
RR
Ripple Rejection
f=1kHz
Ripple 0.2Vp-p
IOUT=100mA
VIN
Input Voltage
ISC
Short Current Limit
IPD
CE Pull-down Current
VCEH
CE Input Voltage "H"
VCEL
CE Input Voltage "L"
en
Typ.
VOUT > 1.5V
Output Current Limit
VOUT/
IOUT
Min.
(Ta = 25°C)
Max. Unit
VOUT ≤ 3.3V
70
VOUT > 3.3V
60
1.4
VOUT=0V
dB
6.5
250
0.3
V
mA
0.7
1.0
µA
V
0.4
V
Output Noise
BW=10Hz to 100kHz
70
µVrms
TTSD
Thermal Shutdown
Detection Temperature
Junction Temperature
165
C
TTSR
Thermal Shutdown
Released Temperature
Junction Temperature
95
C
RLOW
Low Output Nch Tr. ON
VIN=4.0V, VCE=0V
Resistance (D/F version)
50
IDELAY
DELAY pin Current
(DELAY pin version)
VIN=4.0V
0.7
1.2
1.7
µA
All test items listed under Electrical Characteristics are done under the pulse load condition (Tj≈Ta=25ºC) except Output
Noise, Ripple Rejection, Dropout Voltage at 1A Output Current and Load Regulation and Thermal Shutdown.
8
RP132x
NO.EA-265-190408
The specification in
otherwise noted.
is checked and guaranteed by design engineering at −40C ≤ Ta ≤ 85C, unless
Dropout Voltage
Output Voltage
VOUT (V)
(Ta = 25°C)
Dropout Voltage VDIF (V)
Typ.
Max.
Typ.
Max.
0.8 ≤ VOUT < 0.9
0.67
0.89
1.20
1.54
0.9 ≤ VOUT < 1.0
0.59
0.82
1.10
1.46
1.0 ≤ VOUT < 1.1
0.51
0.73
1.05
1.39
0.42
0.63
0.96
1.31
0.36
0.54
0.90
1.23
1.5 ≤ VOUT < 2.6
0.24
0.33
0.78
1.05
2.6 ≤ VOUT < 3.3
0.15
0.21
0.52
0.72
3.3 ≤ VOUT ≤ 5.5
0.13
0.18
0.46
0.68
1.1 ≤ VOUT < 1.2
1.2 ≤ VOUT < 1.5
Condition
IOUT=300mA
Condition
IOUT=1A
9
RP132x
NO.EA-265-190408
VIN=Set VOUT1.0V, IOUT=1mA, CIN=2.2F, COUT=2.2F, VOUT ≤ 3.6V, 4.7F VOUT＞3.6V
The specification in
is checked and guaranteed by design engineering at −40C ≤ Ta ≤ 85C, unless
otherwise noted.
RP132x001B/D(Adjustable Output Voltage Type) /
RP132K001E/F(Adjustable Output Voltage Type with DELAY pin)
Symbol
Item
VFB
Feedback Voltage
VOUT
Output Voltage
Adjusting Range
ILIM
Output Current Limit
Conditions
Ta=25C
40C ≤ Ta ≤ 85C
VOUT=VFB
VOUT=VFB
0.785
0.800
0.815
0.771
0.829
0.8
5.5
V
V
A
0.1mA ≤ IOUT ≤ 300mA
3
20
0.1mA ≤ IOUT ≤ 1A
5
60
IOUT=300mA
0.67
0.89
IOUT=1A
1.20
1.54
65
85
µA
VCE=0V, VIN=6.5V
0.15
0.60
µA
0.05
0.10
%/V
Load Regulation
VDIF
Dropout Voltage
VOUT=VFB
ISS
Supply Current
VOUT=VFB, IOUT=0mA (VIN6.5V)
VOUT/
VIN
Line Regulation
VOUT=VFB, 1.6V ≤ VIN ≤ 6.5V
RR
Ripple Rejection
f=1kHz,
Ripple 0.2Vp-p,
IOUT=100mA
VIN
Input Voltage
ISC
Short Current Limit
IPD
CE Pull-down Current
VCEH
CE Input Voltage "H"
VCEL
CE Input Voltage "L"
en
Typ.
1
VOUT/
IOUT
Istandby Standby Current
Min.
(Ta = 25°C)
Max.
Unit
VOUT=VFB
70
1.4
VOUT=VFB =0V
V
dB
6.5
250
0.3
mV
V
mA
0.7
1.0
µA
V
0.4
V
Output Noise
BW=10Hz to 100kHz
70
µVrms
TTSD
Thermal Shutdown
Detection Temperature
Junction Temperature
165
C
TTSR
Thermal Shutdown
Released Temperature
Junction Temperature
95
C
RLOW
Low Output Nch Tr. ON
VIN=4.0V, VCE=0V
Resistance (D/F version)
50
IDELAY
DELAY pin Current
(DELAY pin version)
VIN=4.0V
0.7
1.2
1.7
µA
All test items listed under Electrical Characteristics are done under the pulse load condition (Tj≈Ta=25ºC) except Output
Noise, Ripple Rejection, Dropout Voltage at 1A Output Current and Load Regulation and Thermal Shutdown.
10
RP132x
NO.EA-265-190408
APPLICATION INFORMATION
Typical Application Circuits
Fixed Output Voltage Type (HSOP-6J/ SOT89-5)
VDD
VOUT
VOUT
RP132S/H
xx1x
CIN
CE
CE Control
COUT
GND
Fixed Output Voltage Type (TO-252-5-P2/ DFN(PLP)1820-6)
VDD
CIN
CE Control
VOUT
VOUT
RP132J/K
xx1x VFB
CE
COUT
GND
Adjustable Output Voltage Type (HSOP-6J / SOT89-5/ TO-252-5-P2 / DFN(PLP)1820-6）
VDD
CIN
VOUT
VOUT
RP132x
001x VFB
R1
COUT
R2
CE Control
CE
GND
11
RP132x
NO.EA-265-190408
Fixed Output Voltage Type with DELAY pin (HSOP-6J)
VDD
VOUT
VOUT
RP132S
xx1E/F
CIN
CE
CE Control
COUT
GND
DELAY
CD
Fixed Output Voltage Type with DELAY pin (DFN(PLP)1820-6)
VDD
CIN
CE Control
VOUT
VOUT
RP132K
xx1E/F VFB
CE
COUT
GND
DELAY
CD
Adjustable Output Voltage Type with DELAY pin (DFN(PLP)1820-6)
VDD
CIN
VOUT
VOUT
RP132K
001E/F
R1
COUT
VFB
R2
CE Control
CE
DELAY
12
GND
CD
RP132x
NO.EA-265-190408
Recommended External Components
VOUT
VOUT ≤ 3.6V
VOUT > 3.6V
Capacitors
CIN (C1)
COUT (C2)
CIN (C1)
COUT (C2)
Kyocera 2.2F (size:1005) [CM05X5R225M06A]
Kyocera 2.2F (size:1608) [CM105X5R225K06AB]
Kyocera 2.2F (size:1005) [CM05X5R225K06A]
Kyocera 4.7F (size:1608) [CM105X5R475M06AB]
Please refer to "Technical Notes on Adjustable Output Voltage Type" when using R1 and R2 as output
capacitors. Also refer to "Inrush Current Limit Time Settings" concerning with CD.
Technical Notes on the External Components
When using this IC, consider the following points:
Phase Compensation
In this IC, phase compensation is made for securing stable operation even if the load current is varied. For this
purpose, use a 4.7F or more capacitor COUT between VOUT pin and GND pin, and as close as possible to the
pins.
If a tantalum capacitor is used, and its ESR (Equivalent Series Resistance) of COUT is large, the loop oscillation
may result. Because of this, select COUT carefully considering its frequency characteristics.
PCB Layout
Make VDD and GND lines sufficient. If their impedance is high, noise pickup or unstable operation may result.
Connect a 2.2 µF or more capacitor CIN between VDD and GND pin with a capacitance value as
"Recommendation value of the external capacitors" above or more, and as close as possible to the pins.
Set external components, especially the output capacitor COUT, as close as possible to the IC, and make wiring
as short as possible.
When using the Adjustable Output Voltage Type, the transient response could be affected by the external
resistors. Evaluate the circuit taking the actual conditions of use into account.
Output Voltage Setting Method (Adjustable Output Voltage Type)
RP132x081x can be adjusted the output voltage up to 5.5V by using the external divider resistors. Also, please
use 16k or less for R2 resistor. If the VFB voltage is described as setVFB, the output voltage can be set by
using the following equations. SetVFB is equal to 0.8V. The VOUT pin of RP132x081x should be connected to
the VFB pin.
13
RP132x
NO.EA-265-190408
VOUT
R1
I1
VFB
RIC
VOUT
IIC
R2
I2
GND
SetVFB
I1=IIC I2 ....................................................................................................................................... (1)
I2=setVFB / R2 ............................................................................................................................... (2)
Thus,
I1=IIC setVFB /R2.......................................................................................................................... (3)
Therefore,
VOUT =setVFB R1 I1 ................................................................................................................... (4)
Put Equation (3) into Equation (4), then
VOUT =setVFB R1(IIC setVFB / R2)
=setVFB (1+R1R2) R1 IIC ............................................................................................. (5)
In Equation (5), R1x IIC is the error-causing factor in VOUT.
As for IIC,
IIC =setVFB / RIC .............................................................................................................................. (6)
Therefore, the error-causing factor R1x IIC can be described as follows.
R1IIC=R1 setVFB / RIC
=setVFB R1 / RIC ................................................................................................................ (7)
For better accuracy, choosing R1 (
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