＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x SERIES
2ch DC/DC for CCD & OLED
NO.EA-157-160224
OUTLINE
The R1283x 2ch DC/DC converter is designed for CCD & OLED Display power source. It contains a step up
DC/DC converter and an inverting DC/DC converter to generate two required voltages by CCD & OLED Display.
Step up DC/DC converter generates boosted output voltage up to 20V. Inverting DC/DC converter generates
negative voltage up to VIN voltage minus 20V independently. Start up sequence is internally made. Each of the
R1283x series consists of an oscillator, a PWM control circuit, a voltage reference, error amplifiers, over current
protection circuits, short protection circuits, an under voltage lockout circuit (UVLO), an Nch driver for boost
operation, a Pch driver for inverting. A high efficiency boost and inverting DC/DC converter can be composed
with external inductors, diodes, capacitors, and resistors.
FEATURES
Operating Voltage ......................................... 2.5V to 5.5V
Step Up DC/DC (CH1)
Internal Nch MOSFET Driver (RON=400mTyp.)
Adjustable VOUT Up to 20V with external resistor
Internal Soft start function (Typ. 4.5ms)
Over Current Protection
Maximum Duty Cycle: 91%(Typ.)
Inverting DC/DC (CH2)
Internal Pch MOSFET Driver (RON=400m Typ.)
Adjustable VOUT Up to Vdd-20V with external resistor
Auto Discharge function for negative output
Internal Soft start function (Typ. 4.5ms)
Over Current Protection
Maximum Duty Cycle: 91%(Typ.)
Short Protection with timer latch function (Typ. 50ms); Short condition for either or both two outputs makes
all output drivers off and latches./ If the maximum duty cycle continues for a certain time, these output
drivers will be turned off.
CE with start up sequence function
CH1CH2 (R1283K001x) / CH2CH1(R1283K002x) Selectable
UVLO function
Operating Frequency Selection .......... 300kHz / 700kHz / 1400kHz
Packages ...................................................... DFN(PLP)2730-12, WLCSP-11-P2
APPLICATION
Fixed voltage power supply for portable equipment
Fixed voltage power supply for CCD, OLED, LCD
1
＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x
BLOCK DIAGRAM
Timer
Current Limit
VCC
PVCC
UVLO
PWM
Control
LX2
VREF
Maxduty
Vref
Discharge
Control
VFB2
Vref
VOUTN
VFB1
Vref
LX1
GND
PWM
Control
CE
2
Sequence
Control
PGND
＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x
SELECTION GUIDE
The start-up sequence, oscillator frequency, and the package for the ICs can be selected at the user’s
request.
Product Name
R1283Z00x-E2-F
R1283K00x-TR
Package
Quantity per Reel
Pb Free
Halogen Free
WLCSP-11-P2
4,000 pcs
Yes
Yes
DFN(PLP)2730-12
5,000 pcs
Yes
Yes
x : The start-up sequence can be designated.
(1) Step-up → Inverting
(2) Inverting → Step-up
: The oscillator frequency is the option as follows.
(A) 300kHz (A Version for 1283Z packaged in WLCSP-11-P2 is not available)
(B) 700kHz
(C) 1400kHz
3
＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x
PIN CONFIGURATIONS
WLCSP-11-P2
DFN(PLP)2730-12
Top View
Top View
Bottom View
3
3
2
2
1
1
A
B
C
D
12 11 10 9
8
Bottom View
7
7
8
D
C
B
A
1
2
3
4
5
6
6
5
PIN DESCRIPTIONS
4
9 10 11 12
WLCSP-11-P2
Pin No
Symbol
Pin Description
A1
PGND
A2
VFB1
Feedback pin for Step up DC/DC
A3
LX1
Switching pin for Step up DC/DC
B1
PVCC
B2
CE
Chip Enable pin for the R1283
B3
LX2
Switching pin for Inverting DC/DC
C1
GND
Analog GND pin
C3
VOUTN
Discharge pin for Negative output
D1
VCC
Analog power source Input pin
D2
VREF
Reference Voltage Output pin
D3
VFB2
Feedback pin for Inverting DC/DC
Power GND pin
Power Input pin
DFN(PLP)2730-12
Pin No
Symbol
Pin Description
1
NC
No Connect
2
LX1
Switching pin for Step up DC/DC
3
LX2
Switching pin for Inverting DC/DC
4
VOUTN
Discharge pin for Negative Output
5
CE
Chip Enable pin for the R1283
6
VFB2
Feedback pin for Inverting DC/DC
7
VREF
Reference Voltage Output pin
8
VCC
Analog power source Input pin
9
VFB1
Feedback pin for Step up DC/DC
10
GND
Analog GND pin
11
PVCC
Power Input pin
12
PGND
Power GND 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.
4
3
2
1
＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x
ABSOLUTE MAXIMUM RATINGS
Symbol
Item
(GND/PGND0V)
Rating
Unit
6.5
V
VCC
VCC / PVCC pin Voltage
VDTC
VFB1 pin Voltage
0.3 to VCC0.3
V
VFB
VFB2 pin Voltage
0.7(1) to VCC0.3
V
VCE
CE pin Voltage
0.3 to VCC0.3
V
VREF
VREF pin Voltage
0.7(1) to VCC0.3
V
VLX1
LX1 pin Voltage
0.3 to 24
V
ILX1
LX1 pin Current
Internally Limited
A
VLX2
LX2 pin Voltage
VCC24 to VCC0.3
V
ILX2
LX2 pin Current
Internally Limited
A
VNFB
VOUTN pin Voltage
VCC24 to VCC0.3
V
PD
Power Dissipation (WLCSP-11-P2) (2)
1000
Power Dissipation (DFN(PLP)2730-12) (2)
1000
mW
Topt
Operating Temperature Range
40 to 85
C
Tstg
Storage Temperature Range
55 to 125
C
1) In case the voltage range is from 0.7V to 0.3V, permissible current is 10mA or less.
2) 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.
5
＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x
ELECTRICAL CHARACTERISTICS
R1283x
Symbol
VCC
Item
Operating Input Voltage
Conditions
Min.
2.5
Typ.
3
2.25
Unit.
V
mA
mA
mA
A
A
A
A
V
2.48
V
1.228
VFB2
V
Istandby
VUVLO1
Standby Current
UVLO Detect Voltage
VUVLO2
UVLO Released Voltage
Rising
VREF Voltage Tolerance
VCC=3.3V
VREF Voltage Temperature
Coefficient
VREF Line Regulation
VREF Load Regulation
VREF Short Current Limit
VFB1 Voltage Tolerance
VFB1 Voltage Temperature
Coefficient
VFB1 Input Current
VFB2 Voltage Tolerance
VFB2 Input Current
VCC=3.3V, 40ºC≤Topt≤85ºC
150
ppm/ºC
2.5V≤VCC≤5.5V
VCC=3.3V, 0.1mA≤IOUT≤2mA
VCC=3.3V, VREF=0V
VCC=3.3V
5
5
15
1.0
mV
mV
mA
V
ICC1
ICC2
VCC Consumption Current
(At no switching)
∆VREF/∆Topt
∆VREF/∆VCC
∆VREF/∆IOUT
ILIMREF
VFB1
∆VFB1/∆Topt
IFB1
VFB2
IFB2
fosc
Maxduty1
Maxduty2
tSS1
tSS2
tDLY
RLX1
IOFFLX1
ILIMLX1
RLX2
IOFFLX2
ILIMLX2
RVOUTN
VCEL
VCEH
ICEL
ICEH
2.05
1.172
VFB2
0.985
VCC=3.3V, 40ºC≤Topt≤85ºC
VCC=5.5V, VFB1=0V or 5.5V
VCC=3.3V
VCC=5.5V, VFB2=0V or 5.5V
VCC=3.3V
Oscillator Frequency
VCC=3.3V
VCC=3.3V
CH1 Max. Duty Cycle
VCC=3.3V
CH2 Max. Duty Cycle
VCC=3.3V
CH1 Soft-start Time
VCC=3.3V, VFB1=0.9V
CH2 Soft-start Time
VCC=3.3V, VFB2=0.12V
Delay Time for Protection
VCC=3.3V
LX1 ON Resistance
VCC=3.3V
LX1 Leakage Current
VCC=5.5V, VLX1=20V
LX1 Current limit
VCC=3.3V
LX2 ON Resistance
VCC=3.3V
LX2 Leakage Current
VCC=5.5V, VLX=14.5V
LX2 Current limit
VCC=3.3V
VOUTN Discharge Resistance VCC=3.3V, VOUTN=0.3V
CE "L" Input Voltage
VCC=2.5V
CE "H" Input Voltage
VCC=5.5V
CE "L" Input Current
VCC=5.5V
CE "H" Input Current
VCC=5.5V
2.0
4.0
8.0
250
300
350
0.1
2.15
VUVLO1
0.16
1.2
VFB2
Max.
5.5
VCC=5.5V, FREQ=300kHz
VCC=5.5V, FREQ=700kHz
VCC=5.5V, FREQ=1400kHz
VCC=5.5V, FREQ=300kHz
VCC=5.5V, FREQ=700kHz
VCC=5.5V, FREQ=1400kHz
VCC=5.5V
Falling
VCC Consumption Current
(Switching)
VREF
6
Topt25C
1.015
150
0.1
25
0.1
240
600
1200
86
86
20
0
300
700
1400
91
91
4.5
4.5
50
400
ppm/ºC
0.1
25
0.1
360
800
1600
5
1.0
1.5
400
1.0
1.5
10
5
1.5
1.0
1.0
25
0.3
1.0
1.0
A
mV
A
kHz
kHz
kHz
%
%
ms
ms
ms
m
A
A
m
A
A
V
V
A
A
＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x
TYPICAL APPLICATION
C1
L1
D1
VOUT1
LX1
VCC
R3
R2
PGND
C2
C5
VFB1
R1
PVCC
VOUTN
D2
C1B
VOUT2
LX2
R6
L2
EN
CE
R5
C3
C6
VFB2
GND
VREF
R4
C4
Pin Connection
Externally short VCC pin to PVCC pin. Externally short GND pin to PGND pin.
Step-up DC/DC converter output voltage setting
The output voltage VOUT1 of the step-up DC/DC converter is controlled with maintaining the VFB1 as 1.0V.
VOUT1 can be set with adjusting the values of R1 and R2 as in the next formula. VOUT1 can be set equal or less
than 20V.
VOUT1 = VFB1 (R1+R2) / R1
Inverting DC/DC converter output voltage setting
The output voltage VOUT2 of the inverting DC/DC converter is controlled with maintaining the VFB2 as 0V.
VOUT2 can be set with adjusting the values of R4 and R5 as in the next formula.
VOUT2 = VFB2 (VREFVFB2) R5 / R4
Auto Discharge Function
When CE level turns from "H" to "L" level, the R1283x goes into standby mode and switching of the outputs of
LX1 and LX2 will stop. Then dischage Tr. between VOUT2 and VCC turns on and discharges the negative output
voltage. When the negative output voltage is discharged to 0V, the Tr. turns off and the negative output will be
Hi-Z.
When the Auto discharge function is unnecessary, VOUTN connect to VCC or make be Hi-Z.
CE
0V
Negative output
Discharge
Hi-Z
7
＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x
Start up Sequence (R1283x001x)
When CE level turns from "L" to "H" level, the softstart of CH1 starts the operation. After detecting output
voltage of CH1(VOUT1) as the nominal level, the soft start of CH2 starts the operation.
CE
CH1 (VOUT1)
0V
Soft start CH1
Soft Start CH2
CH2 (VOUT2)
Start up Sequence (R1283x002x)
When CE level turns from "L" to "H" level, the softstart of CH2 starts the operation. After detecting output
voltage of CH2(VOUT2) as the nominal level, the soft start of CH1 starts the operation.
CE
CH1(VOUT1)
0V
Soft Start CH2
Soft start CH1
CH2(VOUT2)
Short protection circuit timer
In case that the voltage of VFB1 drops, the error amplifier of CH1 outputs "H". In case that the voltage of VFB2
rises, the error amplifier of CH2 outputs "L". The built-in short protection circuit makes the ineternal timer operate
with detecting the output of the error amplifier of CH1 as "H", or the output of the error amplifier of CH2 as "L".
After the setting time will pass, the switching of LX1 and LX2 will stop.
To release the latch operatoion, make the VCC set equal or less than UVLO level and restart or set the CE pin
as "L" and make it "H" again.
During the softstart operation of CH1 and CH2, the timer operates independently from the outputs of the error
amplifiers. Therefore, even if the softstart cannot finish correctly because of the short circuit, the protection timer
function will be able to work correctly.
Phase Compensation
DC/DC converter's phase may lose 180 degree by external components of L and C and load current. Because
of this, the phase margin of the system will be less and the stability will be worse. Therefore, the phase must be
gained.
A pole will be formed by external components, L and C.
Fpole ~ 1 / {2√(L1C2)} (CH1)
Fpole ~ 1 / {2√(L2C3)} (CH2)
Zero will be formed with R2, C5, R5, and C6.
8
＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x
Fzero ~ 1/(2R2C5) (CH1)
Fzero ~ 1/(2R5C6) (CH2)
Set the cut-off frequency of the Zero close to the cut off frequency of the pole by L and C.
To reduce the noise of Feedback voltage
If the noise of the system is large, the output noise affects the feedback and the operation may be unstable. In
that case, resistor values, R1, R2, R4, and R5 should be set lower and make the noise into the feedback pin
reduce. Another method is set R3 and R6 . The appropriate value range is from 1k to 5k.
Set a ceramic 1F or more capacitor as C1B between VCC pin and GND. Set another 4.7F or more
capacitor between PVCC and GND as C1.
Set a ceramic 1F or more capacitor between VOUT1 and GND, and between VOUT2 and GND for each as C2
and C3. Recommendation value range is from 4.7F to 22F.
Set a ceramic capacitor between VREF and GND as C4. Recommendation value range is from 0.1F to
2.2F.
Operation of Step-up DC/DC Converter and Output Current
＜Basic Circuit＞
IL2
Inductor
VIN
Diode
IOUT
VOUT
IL1
CL
Lx Tr
＜Current through L＞
Continuous Mode
Discontinuous Mode
IL
ILxmax
IL
ILxmax
ILxmin
ILxmin
tf
t
t
ton
T=1/fosc
toff
ton
toff
T=1/fosc
9
＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x
There are two operation modes for the PWM control step-up switching regulator, that is the continuous mode
and the discontinuous mode.
When the LX Tr. is on, the voltage for the inductor L will be VIN. The inductor current (IL1) will be;
IL1 = VIN ton / L ............................................................................................................ Formula1
When the Lx transistor turns off, power will supply continuously. The inductor current at off (IL2) will be;
IL2 = (VOUT - VIN) tf / L .................................................................................................. Formula2
In terms of the PWM control, when the tf=toff, the inductor current will be continuous, the operation of the
switching regulator will be continuous mode.
In the continuous mode, the current variation of IL1 and IL2 are same, therefore
VIN ton / L = (VOUT VIN) toff / L .................................................................................. Formula3
In the continuous mode, the duty cycle will be
DUTY = ton / (ton + toff) = (VOUT - VIN) / VOUT .................................................................... Formula4
If the input power equals to output power,
IOUT = VIN2 ton / (2 L VOUT) ....................................................................................... Formula5
When IOUT becomes more then Formula5, it will be continuous mode.
In this moment, the peak current, ILxmax flowing through the inductor is described as follows:
ILxmax = IOUT VOUT / VIN + VIN ton / (2 L) ................................................................. Formula6
ILxmax = IOUT VOUT / VIN + VIN T (VOUT VIN) / (2 L VOUT) .................................. Formula7
Therefore, peak current is more than IOUT. Considering the value of ILxmax, the condition of input and output,
and external components should be selected.
The explanation above is based on the ideal calculation, and the loss caused by Lx switch and external
components is not included.
The actual maximum output current is between 50% and 80% of the calculation.
Especially, when the IL is large, or VIN is low, the loss of VIN is generated with on resistance of the switch. As
for VOUT, VF(as much as 0.3V) of the diode should be considered.
10
＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x
Operation of Inverting DC/DC Converter and Output Current
＜Basic Circuit＞
Lx Tr
Diode
IOUT
VOUT
VIN
IL1
IL2
CL
Inductor
＜Current through L＞
Continuous Mode
Discontinuous Mode
IL
ILxmax
IL
ILxmax
ILxmin
ILxmin
Tf
t
ton
T=1/fosc
toff
t
ton
toff
T=1/fosc
There are also two operation modes for the PWM control inverting switching regulator, that is the continuous
mode and the discontinuous mode.
When the LX Tr. is on, the voltage for the inductor L will be VIN. The inductor current (IL1) will be;
IL1 = VIN ton / L ............................................................................................................ Formula8
Inverting circuit saves energy during on time of Lx Tr, and supplies the energy to output during off time, output
voltage opposed to input voltage is obtained. The inductor current at off (IL2) will be;
IL2 = |VOUT| tf / L .......................................................................................................... Formula9
In terms of the PWM control, when the tf=toff, the inductor current will be continuous, the operation of the
switching regulator will be continuous mode.
In the continuous mode, the current variation of IL1 and IL2 are same, therefore
11
＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x
VIN ton / L = |VOUT| toff / L ......................................................................................... Formula10
In the continuous mode, the duty cycle will be:
DUTY = ton / (ton + toff) = |VOUT| / (|VOUT| + VIN) ............................................................. Formula11
If the input power equals to output power,
IOUT = VIN2 ton / (2 L |VOUT|) ................................................................................... Formula12
When IOUT becomes more then Formula12, it will be continuous mode.
In this moment, the peak current, ILxmax flowing through the inductor is described as follows:
ILxmax = IOUT |VOUT| / VIN + VIN ton / (2 L) ............................................................... Formula13
ILxmax = IOUT |VOUT| / VIN + VIN |VOUT| T / { 2 L (|VOUT| + VIN) } ........................... Formula14
Therefore, peak current is more than IOUT. Considering the value of ILxmax, the condition of input and output,
and external components should be selected.
The explanation above is based on the ideal calculation, and the loss caused by Lx switch and external
components is not included.
The actual maximum output current is between 50% and 80% of the calculation.
Especially, when the IL is large, or VIN is low, the loss of VIN is generated with on resistance of the switch. As
for VOUT, VF (as much as 0.3V) of the diode should be considered.
12
＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x
TYPICAL
TYPCALCHARACTERISTICS
CHARACTERISTICS
1) Output Voltage VS. Output Current
R1283x001A
R1283x001A
Topt=25°C
Topt=25°C
4.8
-4.2
4.7
-4.3
V OUT 2 [V]
V OUT 1 [V]
VIN=2.8V
4.6
VIN=2.8V
4.5
VIN=3.6V
VIN=4.2V
-4.4
-4.5
VIN=3.6V
VIN=4.2V
-4.6
4.4
0
50
100
150
0
200
50
100
IOUT1 [mA]
IOUT 2 [mA]
R1283x001A
R1283x001A
Topt=25°C
12.6
150
200
Topt=25°C
-7.2
-7.3
12.2
-7.4
V OUT 2 [V]
V OUT 1 [V]
VIN=2.8V
12.4
VIN=2.8V
12.0
VIN=3.6V
11.8
VIN=4.2V
VIN=5.0V
11.6
VIN=3.6V
VIN=4.2V
VIN=5.0V
-7.5
-7.6
-7.7
11.4
-7.8
0
25
50
75
100
125
150
0
50
100
IOUT1 [mA]
IOUT2 [mA]
R1283x001B
R1283x001B
Topt=25°C
150
200
Topt=25°C
4.8
-5.2
VIN=2.8V
-5.3
VIN=3.6V
VIN=4.2V
V OUT 2 [V]
V OUT 1 [V]
4.7
4.6
4.5
-5.4
VIN=2.8V
-5.5
VIN=3.6V
VIN=4.2V
4.4
-5.6
0
50
100
150
IOUT1 [mA]
200
250
0
50
100
150
200
IOUT2 [mA]
13
＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x
R1283x001B
R1283x001B
Topt=25°C
Topt=25°C
12.6
-7.2
VIN=2.8V
12.4
-7.3
VIN=3.6V
-7.4
VIN=4.2V
V OUT 2 [V]
V OUT 1 [V]
12.2
VIN=5.0V
12.0
11.8
-7.5
VIN=2.8V
-7.6
11.6
VIN=3.6V
VIN=4.2V
-7.7
VIN=5.0V
11.4
-7.8
0
50
100
150
200
250
0
100
200
IOUT1 [mA]
IOUT2 [mA]
R1283x001C
R1283x001C
Topt=25°C
4.8
-4.2
4.7
-4.3
V OUT 2 [V]
V OUT 1 [V]
Topt=25°C
300
4.6
VIN=2.8V
VIN=3.6V
VIN=4.2V
-4.4
VIN=2.8V
4.5
-4.5
VIN=3.6V
VIN=4.2V
4.4
-4.6
0
50
100
150
200
250
300
350
0
50
100
150
IOUT2 [mA]
R1283x001C
R1283x001C
300
-7.2
VIN=2.8V
12.4
VIN=3.6V
VIN=4.2V
-7.4
V OUT 2 [V]
12.2
VIN=5.0V
12.0
VIN=2.8V
-7.3
VIN=3.6V
V OUT 1 [V]
250
Topt=25°C
Topt=25°C
12.6
11.8
11.6
VIN=4.2V
VIN=5.0V
-7.5
-7.6
-7.7
11.4
-7.8
0
50
100
150
IOUT1 [mA]
14
200
IOUT1 [mA]
200
250
0
50
100
150
200
IOUT2 [mA]
250
300
350
＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x
2) Efficiency VS. Output Current
R1283x001A
R1283x001A
Topt=25℃ , V OUT2=-4.4V
V OUT1=4.6V , IOUT1=0mA
Topt=25 , VVOUT
1=4.6V
Topt=25°C,
OUT1=4.6V
100
100
90
90
80
80
Efficiency [%]
Efficiency [%]
V OUT2=-4.4V , IOUT2=0mA
70
60
60
50
50
VIN=2.8 [V]
40
VIN=3.6 [V]
40
VIN=3.6 [V]
VIN=4.2 [V]
30
VIN=4.2 [V]
30
VIN=2.8 [V]
20
20
0
20
40
60
80
0
100 120 140 160 180
20
40
60
100
120
IOUT1 [mA]
R1283x001A
R1283x001A
90
80
80
Efficiency [%]
90
70
60
VIN=2.8 [V]
50
VIN=3.6 [V]
140
160
Topt=25°C , V OUT2=-7.5V
V OUT1=12V , IOUT1=0mA
100
70
60
VIN=2.8 [V]
50
VIN=3.6 [V]
40
VIN=4.2 [V]
40
30
VIN=5 [V]
30
20
VIN=4.2 [V]
VIN=5 [V]
20
0
20
40
60
80 100
IOUT1 [mA]
120
140
160
0
20
40
60
100
90
90
80
80
Efficiency [%]
100
70
60
VIN=2.8 [V]
40
VIN=3.6 [V]
VIN=4.2 [V]
30
100
120 140
160
R1283x001B
Topt=25°C , V OUT1=4.6V
V OUT2=-5.4V , IOUT2=0mA
50
80
IOUT2 [mA]
R1283x001B
Efficiency [%]
80
IOUT2 [mA]
Topt=25°C , V OUT1=12V
V OUT2=-7.5V , IOUT2=0mA
100
Efficiency [%]
70
Topt=25°C , V OUT2=-5.4V
V OUT1=4.6V , IOUT1=0mA
70
60
50
VIN=2.8 [V]
40
VIN=3.6 [V]
30
VIN=4.2 [V]
20
20
0
50
100
150
IOUT1 [mA]
200
250
0
30
60
90
120
150
180
IOUT2 [mA]
15
＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x
R1283x001B
Topt=25°C , V OUT1=12V
V OUT2=-7.5V , IOUT2=0mA
100
90
80
80
70
70
60
50
VIN=2.8 [V]
40
VIN=3.6 [V]
30
VIN=4.2 [V]
VIN=5 [V]
20
0
30
60
90
120
150
180
VIN=2.8 [V]
40
VIN=3.6 [V]
30
VIN=4.2 [V]
20
VIN=5 [V]
0
210
40
80
120
160
200
IOUT2 [mA]
R1283x001C
R1283x001C
90
80
80
70
70
50
60
50
40
VIN=2.8 [V]
VIN=3.6 [V]
30
VIN=3.6 [V]
VIN=4.2 [V]
20
VIN=4.2 [V]
40
VIN=2.8 [V]
30
20
280
100
90
60
240
Topt=25°C , V OUT2=-4.4V
V OUT1=4.6V , IOUT1=0mA
Topt=25°C , V OUT1=4.6V
V OUT2=-4.4V , IOUT2=0mA
Efficiency [%]
Efficiency [%]
50
IOUT1 [mA]
100
10
10
0
40
80
120
160
200
240
280
320
0
50
100
150
200
IOUT1 [mA]
IOUT2 [mA]
R1283x001C
R1283x001C
Topt=25°C , V OUT1=12V
V OUT2=-7.5V , IOUT2=0mA
100
90
90
80
80
70
70
60
50
VIN=2.8 [V]
40
VIN=3.6 [V]
250
300
Topt=25°C , V OUT2=-7.5V
V OUT1=12V , IOUT1=0mA
100
Efficiency [%]
Efficiency [%]
60
10
10
60
50
VIN=2.8 [V]
40
VIN=3.6 [V]
VIN=4.2 [V]
VIN=5 [V]
30
VIN=4.2 [V]
30
20
VIN=5 [V]
20
10
10
0
30
60
90
120
150
IOUT1 [mA]
16
Topt=25°C, V OUT2=-7.5V
V OUT1=12V , IOUT1=0mA
100
90
Efficiency [%]
Efficiency [%]
R1283x001B
180
210
240
0
40
80
120
160
200
IOUT2 [mA]
240
280
320
＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x
Temperature
3) CE "L" Input Voltage VS. Temparature
4) CE "H" Input Voltage VS. Temperature
Temparature
R1283x00xx
R1283x00xx
VIN=5.5V
1.1
1
1
VCEH [V]
VCEL [V]
VIN=2.5V
1.1
0.9
0.9
0.8
0.8
0.7
-40
0.7
-40
-20
0
20
40
60
80
-20
0
Temparature
5) VFB1 Voltage VS. Temperature
60
80
60
80
0.01
1.01
0.005
1
VFB2 [V]
VFB1 [V]
80
R1283x00xx
1.02
0.99
0
-0.005
0.98
-20
0
20
40
60
-0.01
-40
80
-20
0
Topt [°C]
20
40
Topt [°C]
Temparature
7) VREF Voltage VS. Temperature
8) UVLO Voltage VS. Temparature
Temperature
R1283x00xx
R1283x00xx
1.22
2.4
1.21
2.35
2.3
VUVLO [V]
1.2
VREF [V]
60
6) VFB2 Voltage VS. Temperature
Temparature
R1283x00xx
1.19
1.18
UVLO Release
2.25
2.2
2.15
1.17
1.16
-40
40
Topt [°C]
Topt [°C]
0.97
-40
20
2.1
-20
0
20
Topt [°C]
40
60
80
2.05
-40
UVLO Detect
-20
0
20
40
Topt [°C]
17
＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x
9) LX1 ON Resistance VS. Temparature
Temperature
10) LX2 ON Resistance VS. Temparature
Temperature
R1283x00xx
0.8
0.8
0.6
0.6
RLX2 [Ω]
RLX1 [Ω]
R1283x00xx
0.4
0.2
0.2
0
-40
0.4
-20
0
20
40
60
0
-40
80
-20
0
20
11) LX1 Limit Current VS. Temparature
Temperature
80
60
80
60
80
12) LX2 Limit Current VS. Temperature
Temparature
R1283x00xx
R1283x00xx
2
2
1.8
1.8
ILIMLX2 [mA]
ILIMLX1 [A]
60
Topt [°C]
Topt [°C]
1.6
1.4
1.6
1.4
1.2
1.2
1
-40
40
-20
0
20
40
Topt [°C]
60
1
-40
80
-20
0
20
40
Topt [°C]
Temperature
13) Osillator Frequency VS. Temparature
R1283x00xA
R1283x00xB
800
350
750
FOSC [kHz]
FOSC [kHz]
330
310
290
650
270
250
-40
-20
0
20
Topt [°C]
18
700
40
60
80
600
-40
-20
0
20
Topt [°C]
40
＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x
R1283x00xC
1600
FOSC [kHz]
1500
1400
1300
1200
-40
-20
0
20
40
60
80
Topt [°C]
14) Maxduty1 VS. Temperature
Temparature
R1283x00xB
94
94
93
93
92
92
Maxduty1 [%]
Maxduty1 [%]
R1283x00xA
91
90
90
89
89
88
-40
91
-20
0
20
40
60
88
-40
80
-20
0
20
40
60
80
60
80
Topt [°C]
Topt [°C]
Temparature
15) Maxduty2 VS. Temperature
R1283x00xA
94
92
93
91
92
90
Maxduty2 [%]
Maxduty1 [%]
R1283x00xC
91
90
89
88
-40
89
88
87
-20
0
20
Topt [°C]
40
60
80
86
-40
-20
0
20
40
Topt [°C]
19
＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x
R1283x00xC
92
92
91
91
90
90
Maxduty2 [%]
Maxduty2 [%]
R1283x00xB
89
88
89
88
87
86
-40
87
-20
0
20
40
60
86
-40
80
-20
0
Topt [°C]
7
7
6
6
TSS2 [ms]
TSS1 [ms]
8
5
4
5
4
3
3
2
2
20
40
60
1
-40
80
-20
0
20
Topt [°C]
80
R1283x00xx
100
0
80
-20
IVOUTN [mA]
TDLY [ms]
60
19) VOUTN Discharge Current VS. Temparature
Temperature
R1283x00xx
60
40
-40
-60
-20
0
20
Topt [°C]
20
40
Topt [°C]
Temparature
18) Timer Latch Delay Time VS. Temperature
20
-40
80
R1283x00xx
8
0
60
17) CH2 Soft-start Time VS. Temparature
Temperature
R1283x00xx
-20
40
Topt [°C]
16) CH1 Soft-start Time VS. Temperature
Temparature
1
-40
20
40
60
80
-80
-40
-20
0
20
Topt [°C]
40
60
80
＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x
R1283x002x
Topt=25°C , V IN=3.6V
V OUT 1=12V , V OUT 2=-7.5V
Topt=25°C , V IN=3.6V
V OUT1=12V , V OUT2=-7.5V
6
4
9
6
V OUT1
3
0
-3
V OUT2
-6
-9
15
12
9
2
0
CE
6
3
0
-3
V OUT1
V OUT2
CE Input Voltage [V]
2
0
CE
6
4
Output Voltage [V]
15
12
R1283x001x
CE Input Voltage [V]
Output Voltage [V]
20) Startup Response
-6
-9
0
5
10
15
20
0
5
10
Time [ms]
Time [ms]
R1283x001x
R1283x001x
15
20
21)Shut down Response
Topt=25°C , V IN=3.6V
V OUT 1=12V , V OUT 2=-7.5V
IOUT 1=10mA
6
4
V OUT1
6
3
0
-3
Output Voltage [V]
2
0
CE Input Voltage [V]
V OUT 2 :discharge
-6
-9
2
0
15
12
9
V OUT1
6
3
0
-3
V OUT 2:not discharge
-6
-9
0
5
10
15
20
0
5
Time [ms]
R1283x002x
R1283x002x
Topt=25°C , V IN=3.6V
V OUT 1=12V , V OUT 2=-7.5V
IOUT 1=10mA
V OUT 2:discharge
10
Time [ms]
15
20
Output Voltage [V]
3
0
-3
5
(V OUTN=Open)
6
4
2
0
CE
CE Input Voltage [V]
Output Voltage [V]
2
0
V OUT1
0
20
6
4
15
12
-6
-9
15
Topt=25°C , V IN=3.6V
V OUT 1=12V , V OUT 2=-7.5V
IOUT 1=10mA
CE
9
6
10
Time [ms]
15
12
9
6
3
0
-3
-6
-9
V OUT1
V OUT 2:not discharge
0
5
10
15
CE Input Voltage [V]
Output Voltage [V]
CE
6
4
CE
CE Input Voltage [V]
Topt=25°C , V IN=3.6V
V OUT 1=12V , V OUT 2=-7.5V
IOUT 1=10mA
15
12
9
(V OUTN=Open)
20
Time [ms]
21
＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x
22) Load Transient Response
R1283x00xA
Topt=25°C , V IN=3.6V
Topt=25°C , V IN=3.6V
-
200
50
-
0
-
-50
0
12.4
12.2
Output Voltage [V]
12.6
Output Current [mA]
-100
-7.4
-150
-7.5
-7.6
-7.7
0
1
2
3
4
0
5
1
2
Time [ms]
Time [ms]
R1283x00xB
R1283x00xB
Topt=25°C , V IN=3.6V
12.3
100
12.1
0
11.9
5
50
-
0
-
-50
-7.3
-100
-7.4
-150
-7.5
-7.6
11.5
-7.7
0
1
2
3
4
5
0
1
2
3
Time [ms]
Time [ms]
R1283x00xC
R1283x00xC
4
5
Topt=25°C , V IN=3.6V
200
12.3
100
0
12.1
11.9
11.7
Output Voltage [V]
12.5
Output Current [mA]
Topt=25°C , V IN =3.6V
Output Voltage [V]
4
Topt=25°C , V IN=3.6V
-
Output Voltage [V]
200
Output Current [mA]
12.5
11.7
-
50
-
0
-
-50
-7.3
-100
-7.4
-150
-7.5
-7.6
-7.7
11.5
0
1
2
3
Time [ms]
22
3
Output Current [mA]
12.0
Output Voltage [V]
-7.3
4
5
0
1
2
3
Time [ms]
4
5
Output Current [mA]
Output Voltage [V]
100
Output Current [mA]
R1283x00xA
＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x
APPLIED CIRCUIT
1) Application with outputting power supply (+12V/-7.5V) for CCD from Li battery
3.6V
4.7uF
L1
SBD
VOUT1= 12V
LX 1
10uF x 2
1kΩ
VCC
110kΩ
PGND
C5
VFB1
10kΩ
PVCC
VOUTN
SBD
VOUT2= -7.5V
LX 2
EN
L2
CE
10uF
1kΩ
75kΩ
C6
VFB2
GND
12kΩ
VREF
0.1uF
R1283x00xA
R1283x00xB
R1283x00xC
L1
15H
6.8H
4.7H
L2
10H
6.8H
4.7H
C5
220pF
150pF
120pF
C6
220pF
150pF
120pF
Inductor
SBD
VLF3010 (TDK)
CRS10I30A (TOSHIBA)
2) Application with outputting power supply (+4.6V/-4.4V) for AMOLED from Li battery
3.6V
4.7uF
L1
SBD
VOUT1= 4.6 V
LX1
VCC
36kΩ
PGND
1kΩ
10uF
C5
VFB1
10kΩ
VOUTN
PVCC
SBD
V
VOUT2= 4.4
-
LX2
EN
1kΩ
L2
CE
56kΩ
10uF
C6
VFB2
GND
15kΩ
VREF
0.1uF
R1283x00xA
R1283x00xB
R1283x00xC
L1
15H
4.7H
4.7H
L2
10H
4.7H
4.7H
C5
100pF
47pF
68pF
C6
100pF
33pF
47pF
Inductor
SBD
VLF3010 (TDK)
CRS10I30A (TOSHIBA)
23
＊1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016.
R1283x
3) Application with output disconnect and discharge.
EN
SBD
VOUT1
LX 1
VCC
PGND
EN
VFB1
PVCC
VOUTN
LX 2
EN
CE
VFB2
GND
24
VREF
SBD
VOUT2
1. The products and the product specifications described in this document are subject to change or discontinuation of
production without notice for reasons such as improvement. Therefore, before deciding to use the products, please
refer to Ricoh sales representatives for the latest information thereon.
2. The materials in this document may not be copied or otherwise reproduced in whole or in part without prior written
consent of Ricoh.
3. Please be sure to take any necessary formalities under relevant laws or regulations before exporting or otherwise
taking out of your country the products or the technical information described herein.
4. The technical information described in this document shows typical characteristics of and example application circuits
for the products. The release of such information is not to be construed as a warranty of or a grant of license under
Ricoh's or any third party's intellectual property rights or any other rights.
5. The products listed in this document are intended and designed for use as general electronic components in standard
applications (office equipment, telecommunication equipment, measuring instruments, consumer electronic products,
amusement equipment etc.). Those customers intending to use a product in an application requiring extreme quality
and reliability, for example, in a highly specific application where the failure or misoperation of the product could result
in human injury or death (aircraft, spacevehicle, nuclear reactor control system, traffic control system, automotive and
transportation equipment, combustion equipment, safety devices, life support system etc.) should first contact us.
6. We are making our continuous effort to improve the quality and reliability of our products, but semiconductor products
are likely to fail with certain probability. In order to prevent any injury to persons or damages to property resulting from
such failure, customers should be careful enough to incorporate safety measures in their design, such as redundancy
feature, fire containment feature and fail-safe feature. We do not assume any liability or responsibility for any loss or
damage arising from misuse or inappropriate use of the products.
7. Anti-radiation design is not implemented in the products described in this document.
8. The X-ray exposure can influence functions and characteristics of the products. Confirm the product functions and
characteristics in the evaluation stage.
9. WLCSP products should be used in light shielded environments. The light exposure can influence functions and
characteristics of the products under operation or storage.
10. There can be variation in the marking when different AOI (Automated Optical Inspection) equipment is used. In the
case of recognizing the marking characteristic with AOI, please contact Ricoh sales or our distributor before attempting
to use AOI.
11. Please contact Ricoh sales representatives should you have any questions or comments concerning the products or
the technical information.
Halogen Free
Ricoh is committed to reducing the environmental loading materials in electrical devices
with a view to contributing to the protection of human health and the environment.
Ricoh has been providing RoHS compliant products since April 1, 2006 and Halogen-free products since
April 1, 2012.
https://www.e-devices.ricoh.co.jp/en/
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