R1287x Series
PWM/ VFM, Dual-channel Step-up/ Inverting DC/DC Converter
with Synchronous Rectifier for LCD
NO.EA-325-180907
OUTLINE
The R1287x is a PWM/ VFM dual-channel step-up/ inverting DC/DC converter with synchronous rectifier for
LCD. The step-up DC/DC converter (CH1) generates a 4.5 V to 5.8 V boosted output voltage and the inverting
DC/DC converter (CH2) generates a −4.5 V to −6.0 V inverting output voltage.
Internally, the R1287x consists of an oscillator circuit, PWM control circuits, a reference voltage unit, error
amplifiers, soft-start circuits, a LX peak current limit circuit, short protection circuits, thermal shutdown circuit,
an under voltage lockout circuit (UVLO), a NMOS transistor driver and a synchronous PMOS transistor driver
for CH1, and a PMOS transistor driver and a synchronous NMOS transistor driver for CH2.
The R1287x is employing synchronous rectification for improving the efficiency of rectification by replacing
diodes with built-in switching transistors. Using synchronous rectification not only increases circuit performance
but also allows a design to reduce parts count.
The R1287x provides the PWM control or the PWM/VFM auto switching control. The PWM control switches at
fixed frequency rate in low output current in order to reduce noise. Likewise, the PWM/VFM auto switching
control automatically switches from PWM mode to VFM mode in low output current in order to achieve
high efficiency. Our unique control method can suppress a ripple voltage in the VFM mode, thus the
R1287x can achieve both low ripple voltage at light load and high efficiency.
Both CH1 and CH2 can independently control the ON/ OFF control and freely set the starting sequence and
shutdown sequence. Both CH1 and CH2 own an auto-discharge function which actively discharges the output
voltage to ground when the device is placed in shutdown mode.
The R1287x is offered in a 12-pin WLCSP-12-P1 package and a 12-pin DFN3030-12 package.
FEATURES
Operating Voltage Range ·············································· 2.5 V to 5.5 V
[Step-up DC/DC Converter (CH1)]
Selectable Step-up Output Voltage (VOUTP) ······················ R1287xxxxy: 4.5 V to 5.8 V (0.1 V Step)
Step-up Output Voltage (Externally adjustable) ················· R1287x001y: 4.5 V to 5.8 V
Maximum Output Current (Dependent on inductance) ········· R1287xxxxB/D/F/H: 200 mA,
R1287xxxxC/G: 100 mA
[Inverting DC/DC Converter (CH2)]
Selectable Inverting Output Voltage (VOUTN) ····················· R1287xxxxy: −4.5 V to −5.8 V (0.1 V Step)
Inverting Output Voltage (externally adjustable) ················· R1287x001y: −4.5 V to −6.0 V
Maximum Output Current (dependent on inductance) ·········· R1287xxxxB/D/F/H: 200 mA,
R1287xxxxC/G: 100 mA
1
R1287x
NO.EA-325-180907
[Controller]
ON/ OFF Control: Operates CH1/ CH2 separately by the EN1/ EN2 pin.
Auto-discharge Function: Discharges the output voltage to GND within a short time in shutdown mode.
Latch-type Short Circuit Protection: Short-circuiting of either one of CH1 or CH2 activates this circuit.
Maximum Duty Cycle
LX Peak Current Limit Function
Undervoltage Lockout (UVLO) Threshold ························ Typ. 2.25 V
Thermal Shutdown Temperature ···································· Typ. 150°C
Oscillator Frequency ··················································· R1287xxxxB/D/F/H:1 MHz,
R1287xxxxC/G: 300 kHz
Package ··································································· WLCSP-12-P1, DFN3030-12
APPLICATIONS
Power source for hand-held equipment
Power source for LCD
2
R1287x
NO.EA-325-180907
SELECTION GUIDE
The output voltage types are user-selectable options that can be selected from either fixed output voltage type
or adjustable output voltage type. With the fixed output voltage type, the combination of a CH1 output voltage
and a CH2 output voltage can be selected. The combination of an oscillator frequency, a power controlling
method, and a discharge current can also be selected.
Selection Guide
Product Name
Package
Quantity per Reel
Pb Free
Halogen Free
R1287Zxxxy-E2-F
WLCSP-12-P1
4,000 pcs
Yes
Yes
R1287Lxxxy-TR
DFN3030-12
3,000 pcs
Yes
Yes
xxx: Specify the set output voltage (VSET).
001: Adjustable Output Voltage Type, The output voltage is adjustable using external resistors.
002 to 009: Fixed Output Voltage Type
CH1 Output Voltage (VOUTP): selectable from +4.5 V to +5.8 V by 0.1 V step (1)
CH2 Output Voltage (VOUTN): selectable from −4.5 V to −5.8 V by 0.1 V step (1)
Notes: Refer to Output Voltage for All Combinations of VOUTP and VOUTN.
y: Specify the oscillator frequency, the power controlling method, and the discharge current.
(B) 1 MHz, PWM/ VFM Auto Switching Control, discharge current 0.06 mA
(C) 300 kHz, PWM Control, discharge current 0.06 mA
(D) 1 MHz, PWM Control, discharge current 0.06 mA
(F) 1 MHz, PWM/ VFM Auto Switching Control, discharge current 0.4 mA (2)
(G) 300 kHz, PWM Control, discharge current 0.4 mA (2)
(H) 1 MHz, PWM Control, discharge current 0.4 mA (3)
Output Voltage for All Combinations of VOUTP and VOUTN
VSET Code No. (xxx)
CH1 Output Voltage (VOUTP)
001
Adjustable using external resistors
002
5.0
003
5.4
004
5.75
005
5.6
006
4.5
007
5.8
008
5.5
(4)
009
5.1
(1)
(2)
(3)
(4)
CH2 Output Voltage (VOUTN)
Adjustable using external resistors
−5.0
−5.4
−5.75
−5.6
−4.5
−5.8
−5.5
−5.1
0.05 V step is also available as a custom code
F/G versions are only available for R1287Z
H version is only available for R1287Z and R1287L002H, R1287L003H, R1287L007H
VSET Code No.009 is only available for R1287Z
3
R1287x
NO.EA-325-180907
BLOCK DIAGRAMS
R1287xxxxy Block Diagram (Fixed Output Voltage Type)
4
R1287x
NO.EA-325-180907
R1287x001y Block Diagram (Adjustable Output Voltage Type)
5
R1287x
NO.EA-325-180907
PIN DESCRIPTIONS
Bottom View
Top View
3
3
2
2
1
1
A
B
C
D
D
C
B
A
WLCSP-12-P1 Pin Configurations
WLCSP-12-P1 Pin Description
Pin No.
Symbol
A1
VOUTN
CH2 Output Voltage Pin
A2
PGND
Power Ground Pin
A3
LXP
CH1 Switching Output Pin
B1
LXN
CH2 Switching Output Pin
B2
GND
Analog Ground Pin
B3
VOUTP
CH1 Output Voltage Pin
C1
PVCC
Power Input Voltage Pin
C2
VCC
C3
D1
6
VOUTPS
R1287Zxxxy
VFBP
R1287Z001y
VOUTNS
R1287Zxxxy
VFBN
R1287Z001y
Description
Analog Power Input Voltage Pin
CH1 Feedback Voltage Pin
CH2 Feedback Voltage Pin
D2
EN2
CH2 Enable Control Pin
D3
EN1
CH1 Enable Control Pin
R1287x
NO.EA-325-180907
Bottom View
Top View
12
11
10
9
8
7
1
2
3
4
5
6
12
11
10
9
8
7
1
2
3
4
5
6
DFN3030-12 Pin Configuration
DFN3030-12 Pin Description
Pin No.
Symbol
1
EN2
2
VOUTNS
R1287Lxxxy
VFBN
R1287L001y
Description
CH2 Enable Control Pin
CH2 Feedback Voltage Pin
3
VCC
4
PVCC
5
LXN
6
VOUTN
CH2 Output Voltage Pin
7
PGND
Power Ground Pin
8
LXP
9
VOUTP
10
Analog Power Input Voltage Pin
Power Input Voltage Pin
CH2 Switching Output Pin
CH1 Switching Output Pin
VOUTPS
R1287Lxxxy
VFBP
R1287L001y
CH1 Output Voltage Pin
CH1 Feedback Voltage Pin
11
GND
Analog Ground Pin
12
EN1
CH1 Enable Control Pin
The tab on the bottom of the package enhances thermal performance and is electrically connected to GND
(substrate level). It is recommended that the tab be connected to the ground plane on the board, or otherwise
be left floating.
7
R1287x
NO.EA-325-180907
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings
Symbol
(GND = PGND = 0 V)
Item
Rating
Unit
VCC
VCC / PVCC Pin Voltage
−0.3 to 6.0
V
VEN
EN1/ EN2 Pin Voltage
−0.3 to 6.0
V
VLXP
LXP Pin Voltage
−0.3 to 6.5
V
VOUTP
VOUTP Pin Voltage
VLXN
LXN Pin Voltage
−0.3 to 6.5
V
VCC − 14 to VCC + 0.3
V
VOUTN
VOUTN Pin Voltage
VCC − 14 to 0.3
V
VOUTPS
VOUTPS Pin Voltage
R1287xxxxy
−0.3 ~ 6.5
V
VOUTNS
VOUTNS Pin Voltage
R1287xxxxy
VCC − 14 ~ VCC + 0.3
V
VFBP
VFBP Pin Voltage
R1287x001y
−0.3 to VCC + 0.3
V
VFBN
VFBN Pin Voltage
R1287x001y
−0.3 to VCC + 0.3
V
PD
Power
Dissipation (1)
(WLCSP-12-P1,
Standard Test Land Pattern)
(DFN3030-12,
JEDEC STD.51-7 Test Land Pattern)
1000
mW
3400
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 the permanent
damages and may degrade the lifetime 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
Recommended Operating Conditions
Symbol
Parameter
VCC
Operating Input Voltage
Ta
Operating Temperature Range
Rating
2.5 to 5.5
−40 to 85
Unit
V
°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 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.
(1)
8
Refer to POWER DISSIPATION for detailed information.
R1287x
NO.EA-325-180907
ELECTRICAL CHARACTERISTICS
The specifications surrounded by
are guaranteed by design engineering at −40°C ≤ Ta ≤ 85°C.
R1287x Electrical Characteristics
Symbol
Item
(Ta = 25°C)
Conditions
Min.
Typ.
Max.
Unit
VCC Consumption Current
(at no switching)
VCC = 5.5 V, R1287xxxxy
470
ISTANDBY
Standby Current
VCC = VLXP = 5.5 V,
VEN = VLXN = 0 V, R1287xxxxy
0.1
VUVLO1
UVLO Detector
Threshold
Falling, R1287xxxxy
VUVLO2
UVLO Released Voltage
Rising, R1287xxxxy
VEN1H
EN1 “H” Input Voltage
VCC = 3.7 V, R1287xxxxy
VEN1L
EN1 “L” Input Voltage
VCC = 3.7 V, R1287xxxxy
REN1
EN1 Pull-down Resistance VCC = 3.7 V, R1287xxxxy
VEN2H
EN2 “H” Input Voltage
VCC = 3.7 V, R1287xxxxy
VEN2L
EN2 “L” Input Voltage
VCC = 3.7 V, R1287xxxxy
REN2
EN2 Pull-down Resistance VCC = 3.7 V, R1287xxxxy
tPROT
Protection Delay Time
VCC = 3.7 V, R1287xxxxy
TTSD
Thermal Shutdown
Temperature
VCC = 3.7 V, R1287xxxxy
150
°C
TTSR
Thermal Shutdown
Released Temperature
VCC = 3.7 V, R1287xxxxy
125
°C
3.2 V ≤ VCC ≤ 4.2 V,
10 mA ≤ IOUT ≤ 100 mA,
R1287xxxxB/F
±0.3
%
3.2 V ≤ VCC ≤ 4.2 V,
10 mA ≤ IOUT ≤ 100 mA,
R1287xxxxC/D/G/H
±0.2
%
ICC
2.15
µA
5
2.25
VUVLO1
+0.10
V
2.48
1.2
V
V
0.4
1000
V
kΩ
1.2
V
0.4
1000
21
µA
30
V
kΩ
39
ms
STEP-UP DC/DC CONVERTER (CH1)
∆VOUTP
/∆IOUT
fOSCP
Maxduty1
IVOUTP
tSSP
VOUTP Load Regulation
R1287xxxxB/F
700
900
1100
kHz
R1287xxxxC/G
240
300
360
kHz
R1287xxxxD/H
800
1000
1200
kHz
CH1 PWM Oscillator
Frequency
VCC = 3.7 V
CH1 Maximum Duty
Cycle
VCC = 3.7 V
VOUTP Discharge Current
VCC = 3.7 V,
VOUTP = 0.1
V
R1287xxxxB/F
CH1 Soft-start Time
VCC = 3.7 V,
EN1 = “H” to
VOUTP = VSET
R1287xxxxB/D/F/H
90
%
R1287xxxxC/G
97
%
R1287xxxxB/C/D
0.06
mA
R1287xxxxF/G/H
0.4
mA
1.91
5.54
ms
R1287xxxxC/G
4.5
ms
R1287xxxxD/H
4.5
ms
9
R1287x
NO.EA-325-180907
ELECTRICAL CHARACTERISTICS (continued)
The specifications surrounded by
are guaranteed by design engineering at −40°C ≤ Ta ≤ 85°C.
R1287x Electrical Characteristics
Symbol
Item
tRP
RLXP
(Ta = 25°C)
Conditions
VCC = 3.7 V,
VOUTP = VSET x 10% to 90%,
R1287xxxxB/F
CH1 Rising Time
Min.
Typ.
1.53
Max.
Unit
4.99
ms
CH1 Nch Tr. ON Resistance VCC = 3.7 V, R1287xxxxy
400
mΩ
RSYNCP
CH1 Pch Tr. ON Resistance
VCC = 3.7 V, R1287xxxxy
700
mΩ
ILIMLXP
CH1 Nch Tr. Current Limit
VCC = 3.7 V, R1287xxxxy
1.1
A
VUVP
VOUTP Low Voltage Detector
Threshold
VCC = 3.7 V, R1287xxxxy
2.7
V
[R1287xxxxB, R1287xxxxC, R1287xxxxD, R1287xxxxF, R1287xxxxG, R1287xxxxH]
VOUTP
VOUTP/∆Ta
0.991
VOUTP Voltage
VCC = 3.7 V
VOUTP Voltage
Temperature Coefficient
VCC = 3.7 V, −40°C ≤ Ta ≤ 85°C
VSET
1.009
V
ppm
/°C
±50
[R1287x001B, R1287x001C, R1287x001D, R1287x001F, R1287x001G, R1287x001H]
VFBP
VFBP Voltage
VCC = 3.7 V
0.985
IFBP
VFBP Input Current
VCC = 5.5 V, VFBP = 0 V or 5.5 V
−0.1
VFBP Voltage Temperature
Coefficient
VCC = 3.7 V, −40°C ≤ Ta ≤ 85°C
∆VFBP/∆Ta
1.000
1.015
V
0.1
µA
ppm
/°C
±50
All test items listed under ELECTRICAL CHARACTERISTICS are done under the pulse load condition (Tj ≈ Ta = 25°C)
except VOUTP Voltage Temperature Coefficient, VFBP Voltage Temperature Coefficient, VOUTP Load Regulation, CH1 Rising
Time, CH1 Nch Tr. ON Resistance and CH1 Pch Tr. ON Resistance.
INVERTING DC/DC CONVERTER (CH2)
∆VOUTN
/∆IOUT
foscn
VOUTN Load Regulation
CH2 PWM Oscillator
Frequency
3.2 V ≤ VCC ≤ 4.2 V,
10 mA ≤ IOUT ≤ 100 mA,
R1287xxxxB/F
±0.4
%
3.2V ≤ VCC ≤ 4.2 V,
10 mA ≤ IOUT ≤ 100 mA,
R1287xxxxC/D/G/H
±0.2
%
VCC = 3.7 V
Maxduty2 CH2 Maximum Duty Cycle VCC = 3.7 V
IVOUTN
10
VOUTN Discharge Current
VCC = 3.7 V,
VOUTN = −0.1
R1287xxxxB/F
900
1100
1300
kHz
R1287xxxxC/G
240
300
360
kHz
R1287xxxxD/H
800
1000
1200
kHz
R1287xxxxB/D/F/
H
90
%
R1287xxxxC/G
97
%
R1287xxxxB/C/D
0.2
mA
R1287xxxxF/G/H
0.4
mA
R1287x
NO.EA-325-180907
ELECTRICAL CHARACTERISTICS (continued)
The specifications surrounded by
are guaranteed by design engineering at −40°C ≤ Ta ≤ 85°C.
R1287x Electrical Characteristics
Symbol
tssn
trn
(Ta = 25°C)
Item
Conditions
CH2 Soft-start Time
VCC = 3.7V,
EN2 = “H” to
VOUTN = VSET
CH2 Rising Time
Min.
R1287xxxxB/F
Typ.
0.73
Max.
Unit
4.11
ms
R1287xxxxC/G
2.6
ms
R1287xxxxD/H
2.6
ms
VCC = 3.7 V,
VOUTN = VSET x 10% to 90%,
R1287xxxxB/F
0.58
3.29
ms
RLXN
CH2 Pch Tr. ON Resistance VCC = 3.7 V, R1287xxxxy
400
mΩ
RSYNCN
CH2 Nch Tr. ON Resistance VCC = 3.7 V, R1287xxxxy
600
mΩ
ILIMLXN
CH2 Pch Tr. Current Limit
1.5
A
VCC = 3.7 V, R1287xxxxy
[R1287xxxxB, R1287xxxxC, R1287xxxxD, R1287xxxxF, R1287xxxxG, R1287xxxxH]
VOUTN
∆VOUTN
/∆Ta
VOUTN Voltage
VCC = 3.7 V
VOUTN Voltage
Temperature Coefficient
VCC = 3.7 V, −40°C ≤ Ta ≤ 85°C
0.990
VSET
1.0
1
V
ppm
/°C
±50
[R1287x001B, R1287x001C, R1287x001D, R1287x001F, R1287x001G, R1287x001H]
VFBNO
IFBN
VFBN Voltage
VCC = 3.7 V
VFBN Input Current
VCC = 3.7 V, VFBN = VFBNO x 1.2
∆IFBN
IFBN Current Temperature
/∆Ta
Coefficient
VCC = 3.7 V, −40°C ≤ Ta ≤ 85°C
−30
0
30
mV
6.541
6.667
6.794
µA
±150
ppm
/°C
All test items listed under ELECTRICAL CHARACTERISTICS are done under the pulse load condition (Tj ≈ Ta = 25°C)
except VOUTN Load Regulation, CH2 Rising Time, CH2 Pch Tr. ON Resistance, CH2 Nch Tr. ON Resistance, VOUTN Voltage
Temperature Coefficient and IFBN Current Temperature Coefficient.
11
R1287x
NO.EA-325-180907
ELECTRICAL CHARACTERISTICS (continued)
CH1 Electrical Characteristics by Different Output Voltage
foscp
ΔVOUTP/ΔIOUT
Product Name
R1287x001B/F
R1287x001C/G
R1287x001D/H
R1287x002B/F
R1287x002C/G
R1287x002D/H
R1287x003B/F
R1287x003C/G
R1287x003D/H
R1287x004B/F
R1287x004C/G
R1287x004D/H
R1287x005B/F
R1287x005C/G
R1287x005D/H
R1287x006B/F
R1287x006C/G
R1287x006D/H
R1287x007B/F
R1287x007C/G
R1287x007D/H
R1287x008B/F
R1287x008C/G
R1287x008D/H
R1287x009B/F
R1287x009C/G
R1287x009D/H
12
[%]
[kHz]
Maxduty1
VOUT
[%]
[V]
Typ.
Min.
Typ.
Max.
Typ.
±0.3
700
900
1100
90
240
300
360
97
800
1000
1200
90
±0.2
±0.3
±0.2
±0.3
±0.2
±0.3
±0.2
±0.3
±0.2
±0.3
±0.2
±0.3
±0.2
±0.3
±0.2
±0.3
±0.2
700
900
1100
90
240
300
360
97
800
1000
1200
90
700
900
1100
90
240
300
360
97
800
1000
1200
90
700
900
1100
90
240
300
360
97
800
1000
1200
90
700
900
1100
90
240
300
360
97
800
1000
1200
90
700
900
1100
90
240
300
360
97
800
1000
1200
90
700
900
1100
90
240
300
360
97
800
1000
1200
90
700
900
1100
90
240
300
360
97
800
1000
1200
90
700
900
1100
90
240
300
360
97
800
1000
1200
90
Min.
Typ.
Max.
-
-
-
4.955
5.0
5.045
5.351
5.4
5.449
5.698
5.75
5.802
5.550
5.6
5.650
4.460
4.5
4.541
5.748
5.8
5.852
5.451
5.5
5.550
5.054
5.1
5.146
R1287x
NO.EA-325-180907
ELECTRICAL CHARACTERISTICS (continued)
CH2 Electrical Characteristics by Different Output Voltage
foscn
ΔVOUTN/ΔIOUT
Product Name
R1287x001B/F
R1287x001C/G
R1287x001D/H
R1287x002B/F
R1287x002C/G
R1287x002D/H
R1287x003B/F
R1287x003C/G
R1287x003D/H
R1287x004B/F
R1287x004C/G
R1287x004D/H
R1287x005B/F
R1287x005C/G
R1287x005D/H
R1287x006B/F
R1287x006C/G
R1287x006D/H
R1287x007B/F
R1287x007C/G
R1287x007D/H
R1287x008B/F
R1287x008C/G
R1287x008D/H
R1287x009B/F
R1287x009C/G
R1287x009D/H
[%]
[kHz]
Maxduty2
VOUT
[%]
[V]
Typ.
Min.
Typ.
Max.
Typ.
±0.4
900
1100
1200
90
240
300
360
97
800
1000
1200
90
±0.2
±0.4
±0.2
±0.4
±0.2
±0.4
±0.2
±0.4
±0.2
±0.4
±0.2
±0.4
±0.2
±0.4
±0.2
±0.4
±0.2
900
1100
1200
90
240
300
360
97
800
1000
1200
90
900
1100
1200
90
240
300
360
97
800
1000
1200
90
900
1100
1200
90
240
300
360
97
800
1000
1200
90
900
1100
1200
90
240
300
360
97
800
1000
1200
90
900
1100
1200
90
240
300
360
97
800
1000
1200
90
900
1100
1200
90
240
300
360
97
800
1000
1200
90
900
1100
1200
90
240
300
360
97
800
1000
1200
90
900
1100
1200
90
240
300
360
97
800
1000
1200
90
Min.
Typ.
Max.
-
-
-
−4.950
−5.0
−5.050
−5.346
−5.4
−5.454
−5.693
−5.75
−5.808
−5.544
−5.6
−5.656
−4.455
−4.5
−4.545
−5.742
−5.8
−5.858
−5.445
−5.5
−5.555
−5.049
−5.1
−5.151
13
R1287x
NO.EA-325-180907
THEORY OF OPERATION
EN1 / EN2 Enabled Timing
When enabled the EN1 pin first and then the EN2 pin
If the EN1 pin is switched from low to high, CH1 performs soft-start operation. If the EN2 pin is switched from
low to high while the EN1 pin is high, CH2 will not perform soft-start operaton until CH1 detects that the output
voltage of CH1 (VOUTP) has reached the preset voltage.
EN1 input
EN2 input
CH1 output (VOUTP)
tssp
tssn
0V
CH2 output (VOUTN)
When enabled the EN2 pin first and then the EN1 pin
If the EN2 pin is switched from low to high, CH2 performs soft-start operation. If the EN1 pin is switched from
low to high while the EN2 pin is high, CH1 will not perform soft-start operaton until CH2 detects that the output
voltage of CH2 (VOUTN) has reached the preset voltage.
EN1 input
EN2 input
tssp
CH1 output (VOUTP)
tssn
0V
CH2 output (VOUTN)
14
R1287x
NO.EA-325-180907
When enabled the EN1 Pin and the EN2 Pin while Short-circuiting
If the EN1 pin and the EN2 pin are switched from low to high while they are short-circuited, CH1 performs softstart operation. CH2 will not perform soft-start operaton until CH1 detects that the output voltage of CH1 (VOUTP)
has reached the preset voltage.
EN input
CH1 output (VOUTP)
0V
tssp
CH2 output (VOUTN)
tssn
Auto Discharge Function
CH1 can be turned off by setting the EN1 pin low, and CH2 can be turned off by setting the EN2 pin low. Both
CH1 and CH2 can be controlled indivudally. If CH1/ CH2 is turned off by setting the EN1/ EN2 pin low, the
auto-discharge function is enabled. The switch between the VOUTP/ VOUTN pin and the GND pin is turned on
while the auto-discharge function is enabled. While both EN1 and EN2 pins are set low, the device is in the
standby mode. If CH1/ CH2 is turned off by other reasons, such as the VCC pin voltage is dropped below the
UVLO detector threshold or the timer-latch circuit is triggered due to short-circuit, the auto-discharge function
is disabled.
Example of R1287xxxxB/C/D Falling Waveform
EN1 (= EN2)
VOUTP
0V
VOUTN
Discharge
15
R1287x
NO.EA-325-180907
Example of R1287xxxxF/G/H Falling Waveform
EN1
EN2
VOUTP
0V
VOUTN
Discharge
Discharge
Thermal Shutdown Protection
Thermal shutdown circuit detects the overheating of the device and stops the device operation to protect the
device from damages. If the internal temperature of the device exceeds the thermal shutdown temperature,
the thermal shutdown circuit turns off the drivers and synchronous transistors. If the internal temperature of
the device falls below the thermal shutdown release temperature, the thermal shutdown circuit resets the
device and restarts the device operation. Please note that the re-starting sequence of the device is performed
by the following order: CH2 first and then CH2.
Low Output Voltage Detection Circuit for CH1
If CH1 detects a significant voltage drop, after the completion of soft-start operation, CH1 resets the device
and restarts the device operation. Please note that the re-starting sequence of the device is performed by the
following order: CH first and then CH2.
LX Peak Current Limit Timer/ Latch-type Short Circuit Protection Timer
The LX peak current limit circuit supervises the peak current of the inductor, which is passing through NMOS
transistor of CH1 and PMOS transistor of CH2, in every switching cycle. If the peak current exceeds the LX
peak current limit (ILIMLXP/ ILIMLXN), the LX peak current limit circuit turns off the NMOS transistor of CH1 or PMOS
transistor of CH2. The latch-type short circuit protection circuit latches the built-in drivers of CH and CH2 off to
stop the operation of the device if the overcurrent state continues more than the protection delay time (tprot).
Please note that ILIMLXP/ ILIMLXN and tprot can be easily affected by self-heating and ambient environment. Also,
the significant voltage drop or the unstable voltage caused by short-circuiting may affect on the protection
operation and the delay time. To release the latch-type short circuit protection, switch the EN1/ EN2 pin from
high to low to reset the device or make the input voltage (VIN) lower than the UVLO detector threshold (VUVL01).
16
R1287x
NO.EA-325-180907
During the softstart operation of CH1 and CH2, both LX peak current limit circuit timer and latch-type short
circuit protection circuit timer operate until CH1 and CH2 reach their preset voltages. Therefore, the normal
operation of circuit timers will not be affected by the abnormal completion of soft-start operation due to shortcircuit or etc.
Protection Resistors between VOUTN and VOUTNS in Fixed Output Voltage Type (R1287Lxxxy)
If the VOUTNS pin and the VOUTN pin are connected to each other on PCB while the VOUTNS pin and the VCC pin
or the EN2 pin are short-circuited due to some failure, the voltage higher than the rated voltage will be applied
to the VOUTN pin. To prevent this, it is recommended that an approximately 100 Ω protection resistor be
connected between the VOUTN pin and the VOUTNS pin.
Operation of CH1 and Output Current
IL2
Inductor
VIN
Pch Tr
IOUT
VOUT
IL1
Nch Tr
CL
Basic Circuit
Discontinuous Inductor Current Mode
Continuous Inductor Current Mode
ILxmax
IL
IL
ILxma
x
ILxmin
ILxmin
Tf
t
t
ton
toff
T=1/fosc
1/ton
ton
toff
T=1/fosc
1/ton
Inductor Current Waveshapes (IL) through Indictor (L)
The PWM control type of CH1 has two operation modes characterized by the continuity of inductor current:
discontinuous inductor current mode and continuous inductor current mode.
17
R1287x
NO.EA-325-180907
When a NMOS Tr. is in On-state, the voltage to be applied to the inductor (L) is described as VIN. An increase
in the inductor current (IL1) can be written as follows:
IL1 = VIN x ton / L ··········································································································Equation 1
In the CH1 circuit, the energy accumulated during the On-state is transferred into the capacitor even in the Offstate. A decrease in the inductor current (IL2) can be written as follows:
IL2 = (VOUT − VIN) x tf / L ·································································································Equation 2
In the PWM control, IL1 and IL2 become continuous when tf = toff, which is called continuous inductor current
mode.
When the device is in continuous inductor current mode and operates in steady-state conditions, the
variations of IL1 and IL2 are same:
VIN x ton / L = (VOUT − VIN) x toff / L ···················································································Equation 3
Therefore, the duty cycle in continuous inductor current mode is:
Duty = ton / (ton + toff) = (VOUT − VIN) / VOUT ········································································Equation 4
If the input voltage (VIN) is equal to VOUT, the output current (IOUT) is:
IOUT = VIN2 x ton / (2 x L x VOUT) ························································································Equation 5
If IOUT is larger than Equation 5, the device switches to continuous inductor current mode.
The LX peak current flowing through L (ILxmax) is:
ILxmax = IOUT x VOUT / VIN + VIN x ton / (2 x L) ······································································Equation 6
ILxmax = IOUT x VOUT / VIN + VIN x T x (VOUT − VIN) / (2 x L x VOUT) ·············································Equation 7
As a result, ILxmax becomes larger compared to IOUT.
In discontinuous inductor current mode, ILxmax is:
ILxmax = √ (2 x IOUT x (VOUT − VIN) x T / L) ··········································································Equation 8
18
R1287x
NO.EA-325-180907
The LX peak current limit circuit operates in both modes if the ILxmax becomes more than the LX peak current
limit. When considering the input and output conditions or selecting the external components, please pay
attention to ILxmax.
Notes: The above calculations are based on the ideal operation of the device. They do not include the losses
caused by the external components or LX switch. The actual maximum output current will be 70% to 90% of
the above calculation results. Especially, if IL is large or VIN is low, it may cause the switching losses.
Operation of CH2 and Output Current
Pch Tr
Nch Tr
IOUT
VOUT
VIN
IL1
IL2
CL
Inductor
Basic Circuit
Discontinuous Inductor Current Mode
Continuous Inductor Current Mode
ILxmax
IL
IL
ILxma
x
ILxmin
ILxmin
Tf
t
t
ton
toff
T=1/fosc
1/ton
ton
toff
T=1/fosc
1/ton
Inductor Current Waveshapes (IL) through Indictor (L)
The PWM control type of CH2 has two operation modes characterized by the continuity of inductor current:
discontinuous inductor current mode and continuous inductor current mode.
When a PMOS Tr. is in ON-state, the voltage to be applied to the inductor (L) is described as VIN. An increase
in the inductor current (IL1) can be written as follows:
IL1 = VIN x ton / L ··········································································································Equation 9
19
R1287x
NO.EA-325-180907
In the CH2 circuit, the energy accumulated during the On-state is transferred into the capacitor even in the Offstate. A decrease in the inductor current (IL2) can be written as follows:
IL2 = |VOUT| x tf / L······································································································· Equation 10
In the PWM control type, when tf = toff, the inductor current will be continuous and the operation of CH2 will
be continuous inductor current mode. When the device is in continuous inductor current mode and operates
in steady-state conditions, the variation of IL1 and IL2 are same:
VIN x ton / L = |VOUT| x toff / L ························································································· Equation 11
Therefore, the duty cycle in continuous inductor current mode is:
Duty = ton / (ton + toff) = |VOUT| / (|VOUT| + VIN) ··································································· Equation 12
If the input voltage (VIN) equal to VOUT, the output current (IOUT) is:
IOUT = VIN2 x ton / (2 x L x |VOUT|) ····················································································· Equation 13
If IOUT is larger than Equation 13, the device switches to continuous inductor current mode.
The LX peak current flowing through L (ILxmax) is:
ILxmax = IOUT x (|VOUT| + VIN) / VIN + VIN x ton / (2 x L) ························································· Equation 14
ILxmax = IOUT x (|VOUT| + VIN) / VIN + VIN x |VOUT| x T / { 2 x L x (|VOUT| + VIN) } ··························· Equation 15
As a result, ILxmax becomes larger compared to IOUT.
In discontinuous inductor current mode, ILxmax is:
ILxmax = √ (2 x IOUT x |VOUT| x T / L) ················································································ Equation 16
The LX peak current limit circuit operates in both modes if the ILxmax becomes more than the LX peak current
limit. When considering the input and output conditions or selecting the external components, please pay
attention to ILxmax.
Notes: The above calculations are based on the ideal operation of the device. They do not include the losses
caused by the external components or LX switch. The actual maximum output current will be 70% to 90% of
the above calculation results. Especially, if IL is large or VIN is low, it may cause the switching losses.
20
R1287x
NO.EA-325-180907
VFM Mode Operation (R1287xxxxB/F)
The PWM/VFM auto switching control automatically switches from PWM mode to VFM mode in low output
current in order to achieve high efficiency. With the VFM mode operation, ton is preset inside the IC.
In continuous inductor current mode, if the inductor current is set to 4.7 µH, ton is set in a way that ILmax
becomes 600 mA or less. In discontinuous inductor current mode, if the inductor current is set to 4.7 µH, ton
is set in a way that ILpp becomes 400 mA or less.
ILmax
IL
0
ILmin
t
ton
toff
VFM Mode Operation (Discontinuous Inductor Current Mode)
IL
ILpp
0
t
ton
toff
VFM Mode Operation (Continuous Inductor Current Mode)
21
R1287x
NO.EA-325-180907
APPLICATION INFORMATION
Typical Application Circuit
VOUTN
C3
L2
C1
VOUTNS
EN2
VOUTN
EN1
LXN
EN control
for VOUTN
EN control
for VOUTP
VOUTPS
PVCC
VOUTP
VCC
LXP
GND
PGND
VOUTP
L1
C2
R1287xxxxy Typical Application (Fixed Output Voltage Type)
R3
VOUTN
C3
L2
VFBN
EN2
VOUTN
EN1
LXN
VFBP
PVCC
C1
VCC
GND
VOUTP
LXP
EN control
for VOUTN
EN control
for VOUTP
C4
R1
R2
L1
VOUTP
C2
PGND
R1287x001y Typical Application (Adjustable Output Voltage Type)
Recommended Components
Symbol
L1, L2
22
Descriptions
VLF302510M-4R7M, TDK
DFE252010C, TOKO, 1269AS-H-4R7M=P2
C1 (CIN)
10 µF, 2012 size, X5R T = Max. 0.85, C2012X5R0J106M, TDK
C2 (COUTP)
10 µF, 2012 size, X5R T = Max. 0.85, C2012X5R0J106M, TDK
C3 (COUTN)
10 µF, 2012 size, X5R T = Max. 0.85, C2012X5R0J106M, TDK
R1287x
NO.EA-325-180907
TECHNICAL NOTES
The performance of a power source circuit using this device is highly dependent on a peripheral circuit. A
peripheral component or the device mounted on PCB should not exceed a rated voltage, a rated current or a
rated power. When designing a peripheral circuit, please be fully aware of the following points.
Place a 10 µF or more ceramic capacitor (C1) between the VCC pin and the GND pin, or the PVCC pin and
the PGND pin in a shortest distance. The GND pin should be connected to the GND plane of the PCB.
Make GND and PGND to the same potential.
Make VCC and PVCC to the same potential.
The wiring between LXP pin, LXN pin and inductor each should be as short as possible and mount output
capacitors (C2 and C3) as close as possible to the VOUTP, VOUTN each.
Input impedance of VOUTPS pin, VOUTNS pin, VFBP pin, and VFBN pin is high, therefore, the external noise may
affect on the performance. The coupling capacitance between these nodes and switching lines must be as
short as possible.
For stable operation of the device, the R1287x provides a phase compensation circuit according to the
values of inductors (L1, L2) and capacitors (C2, C3).
Use L1 or L2 which is having a low equivalent series resistance, having enough tolerable current and which
is less likely to cause magnetic saturation. A large load current causes a significant drop of the inductance
value. Therefore, select the inductor value in consideration of the amount of load current under using
condition. A significant drop of the inductance value can cause an increase in the LX peak current along
with an increase in the load current. When the LX peak current reaches the current limit, the LX peak current
limit circuit starts operating.
CH1 Output Voltage Setting (R1287x001y: Adjustable Output Voltage Type)
The output voltage of CH1 (VOUTP) controls the output voltage of CH1 feedback pin voltage (VFBP) to 1.0 V.
VOUTP, depending on the resistors (R1 and R2), can be calculated as follows:
VOUTP = VFBP x (R1 + R2) / R1
VOUTP can be set within the range of 4.5 V to 5.8 V. R1 between 20 kΩ to 60 kΩ is recommended.
CH2 Output Voltage Setting (R1287x001y: Adjustable Output Voltage Type)
The output voltage of CH2 (VOUTN) controls the output voltage of CH2 feedback pin voltage (VFBN) to 0 V.
VOUTN, depending on the resistor (R3) and the VFBN pin input current (IFBN), can be calculated as follows:
VOUTN = −IFBN x R3
VOUTN can be set within the range of −4.5 V to −6.0 V. The reommended value for R3 is as follows:
VOUTN Setting
−5.0 V
−5.4 V
−5.6 V
R3
750 kΩ
810 kΩ (310 kΩ + 500 kΩ)
840 kΩ (680 kΩ + 160 kΩ)
23
R1287x
NO.EA-325-180907
Phase Compensation of CH1 (R1287x001y: Adjustable Output Voltage Type)
The phase compensation of CH1 can be delayed 180 degree because of the external components (L, C)
and the load current. The phase delay causes the loss in phase margins and stability. Therefore, the phase
advance should be ensured.
A zero-point can be formed with R1 and C4 as follows:
C4 [pF] = 300/ R1 [kΩ]
Protection Resistor between VOUTN and VOUTNS Pins (R1287Lxxxy: Fixed Output Voltage Type)
If the VOUTNS pin and the VOUTN pin are connected to each other on PCB while the VOUTNS pin and
the VCC pin or the EN2 pin are short-circuited due to some failure, the voltage higher than the rated voltage
will be applied to the VOUTN pin. To prevent this, it is recommended that an approximately 100 Ω protection
resistor (R4) be connected between the VOUTN pin and the VOUTNS pin.
Current Path on PCB
The current paths of boost DC/DC converter are shown in Fig.3 and Fig.4, and the current path of inverting
DC/DC converter are shown in Fig.5 and Fig. 6.
The parasitic impedance, inductance, and the capacitance in the parts pointed with red arrows in Fig.4 and
Fig.6 have an influence against the stability of the DC/DC converters and become a cause of the noise.
Therefore, such parasitic elements must be made as small as possible.
Wiring of the current paths shown in Fig3 to Fig6 must be short and thick.
【Boost DCDC Converter】
NMOSFET-ON (BOOST)
PMOSFET-ON (BOOST)
【Inverting DCDC Converter】
PMOSFET-ON (INVERTING)
24
NMOSFET-ON (INVERTING)
R1287x
NO.EA-325-180907
PCB Layout
R1287Zxxxy (PKG: WLCSP-12)
Top Side
Bottom Side
R1287Z001y (PKG: WLCSP-12)
Top Side
Bottom Side
25
R1287x
NO.EA-325-180907
R1287Lxxxy (PKG: DFN3030-12)
Top Side
Bottom Side
R4 is protection resistor, see TECHNICAL NOTES for details.
R1287L001y (PKG: DFN30303-12)
Top Side
26
Bottom Side
R1287x
NO.EA-325-180907
TYPICAL CHARACTERISTICS
5.05
5.05
5.04
5.04
5.03
5.03
5.02
5.02
VOUTP [V]
VOUTP [V]
Notes: Typical Characteristics are intended to be used as reference data; they are not guaranteed.
1) Output Voltage vs. Output Current
R1287x001B/F (VOUTP = 5.0 V)
R1287x001C/G (VOUTP = 5.0 V)
(Ta = 25°C)
(Ta = 25°C)
5.01
5.00
4.99
5.01
5.00
4.99
Vcc = 3.2 V
4.98
Vcc = 3.7 V
4.97
Vcc = 4.2 V
4.96
4.95
0
20
40
60
4.98
Vcc = 3.2 V
4.97
Vcc = 3.7 V
4.96
Vcc = 4.2 V
4.95
80 100 120 140 160 180 200
IOUTP [mA]
0
5.05
5.65
5.04
5.64
5.03
5.63
5.02
5.62
5.01
5.00
80
100
5.61
5.60
5.59
4.99
Vcc = 3.2 V
4.98
Vcc = 3.7 V
5.57
Vcc = 4.2 V
4.96
Vcc = 3.2 V
5.58
Vcc = 3.7 V
4.97
Vcc = 4.2 V
5.56
5.55
4.95
0
20
40
60
0
80 100 120 140 160 180 200
IOUTP [mA]
R1287x001C/G (VOUTP = 5.6 V)
(Ta = 25°C)
5.65
-4.95
5.64
-4.96
5.63
-4.97
5.62
-4.98
5.61
5.60
5.59
Vcc = 3.2 V
5.58
60
80 100 120 140 160 180 200
IOUTP [mA]
-4.99
-5.00
-5.01
Vcc = 3.2 V
Vcc = 3.7 V
-5.03
Vcc = 4.2 V
5.56
40
-5.02
Vcc = 3.7 V
5.57
20
R1287x001B/F (VOUTN = −5.0 V)
(Ta = 25°C)
VOUTN [V]
VOUTP [V]
40
60
IOUTP [mA]
R1287x001B/F (VOUTP = 5.6 V)
(Ta = 25°C)
VOUTP [V]
VOUTP [V]
R1287x001D/H (VOUTP = 5.0 V)
(Ta = 25°C)
20
Vcc = 4.2 V
-5.04
-5.05
5.55
0
20
40
60
IOUTP [mA]
80
100
0
20
40
60
80 100 120 140 160 180 200
IOUTN [mA]
27
R1287x
NO.EA-325-180907
R1287x001D/H (VOUTN = −5.0 V)
(Ta = 25°C)
-4.95
-4.95
-4.96
-4.96
-4.97
-4.97
-4.98
-4.98
VOUTN [V]
VOUTN [V]
R1287x001C/G (VOUTN = −5.0 V)
(Ta = 25°C)
-4.99
-5.00
-4.99
-5.00
-5.01
Vcc = 3.2 V
-5.01
-5.02
Vcc = 3.7 V
-5.02
Vcc = 3.2 V
-5.03
Vcc = 4.2 V
-5.03
Vcc = 3.7 V
-5.04
Vcc = 4.2 V
-5.04
-5.05
-5.05
0
20
40
60
IOUTN [mA]
80
0
100
-5.56
-5.56
-5.57
-5.57
-5.58
-5.58
VOUTN [V]
VOUTN [V]
-5.55
80
100 120 140 160 180 200
-5.59
-5.60
-5.61
-5.61
Vcc = 3.2 V
-5.62
Vcc = 3.7 V
-5.63
Vcc = 4.2 V
-5.64
-5.65
-5.62
Vcc = 3.2 V
-5.63
Vcc = 3.7 V
Vcc = 4.2 V
-5.64
-5.65
0
28
60
R1287x001C/G (VOUTN = −5.6 V)
(Ta = 25°C)
-5.55
-5.60
40
IOUTN [mA]
R1287x001B/F (VOUTN = −5.6 V)
(Ta = 25°C)
-5.59
20
20
40
60
80 100 120 140 160 180 200
IOUTN [mA]
0
20
40
60
IOUTN [mA]
80
100
R1287x
NO.EA-325-180907
R1287x001C/G (VOUTP = 5.0 V, VOUTN = −5.0 V)
(Ta = 25°C)
95
95
90
90
Efficiency [%]
Efficiency [%]
2) Efficiency vs. Output Current
R1287x001B/F (VOUTP = 5.0 V, VOUTN = −5.0 V)
(Ta = 25°C)
85
80
Vcc = 3.2 V
75
80
Vcc = 3.2 V
75
Vcc = 3.7 V
Vcc = 3.7 V
Vcc = 4.2 V
70
Vcc = 4.2 V
70
65
65
0
20
40
60 80 100 120 140 160 180 200
IOUT = IOUTP = IOUTN [mA]
0
R1287x001D/H (VOUTP = 5.0 V, VOUTN = −5.0 V)
(Ta = 25°C)
95
95
90
90
85
80
Vcc = 3.2 V
75
10
20
0
20
40
60 80 100 120 140 160 180 200
IOUT = IOUTP = IOUTN [mA]
100
Vcc = 3.2 V
Vcc = 3.7 V
Vcc = 4.2 V
70
65
90
80
Vcc = 4.2 V
70
80
85
75
Vcc = 3.7 V
30 40 50 60 70
IOUT = IOUTP = IOUTN [mA]
R1287x001B/F (VOUTP = 5.6 V, VOUTN = −5.6 V)
(Ta = 25°C)
Efficiency [%]
Efficiency [%]
85
65
0
20
40
60 80 100 120 140 160 180 200
IOUT = IOUTP = IOUTN [mA]
R1287x001C/G (VOUTP = 5.6 V, VOUTN = −5.6 V)
(Ta = 25°C)
95
Efficiency [%]
90
85
80
Vcc = 3.2 V
75
Vcc = 3.7 V
Vcc = 4.2 V
70
65
0
10
20
30
40
50
60
70
IOUT = IOUTP = IOUTN [mA]
80
90
100
29
R1287x
NO.EA-325-180907
R1287x001B/F (VOUTP = 5.6 V)
(Ta = 25°C)
1000
1000
900
900
800
800
700
600
500
400
Vcc = 3.2V
300
Vcc = 3.7V
200
Vcc = 4.2V
Boost Freqency [kHz]
Boost Freqency [kHz]
3) Frequency vs. Output Current (VFM mode)
R1287x001B/F (VOUTP = 5.0 V)
(Ta = 25°C)
700
600
500
400
Vcc = 3.2V
300
Vcc = 3.7V
200
Vcc = 4.2V
100
100
0
0
0
20
40
60
80
0
100 120 140 160 180 200
IOUTP [mA]
1000
1000
Vcc = 3.2V
Vcc = 3.7V
200
Inverting Freqency [kHz]
Inverting Freqency [kHz]
1200
400
60
80
100 120 140 160 180 200
R1287x001B/F (VOUTN = −5.6 V)
(Ta = 25°C)
1200
600
40
IOUTP [mA]
R1287x001B/F (VOUTN = −5.0 V)
(Ta = 25°C)
800
20
800
600
400
Vcc = 3.2V
Vcc = 3.7V
200
Vcc = 4.2V
Vcc = 4.2V
0
0
0
20
40
60
80
100 120 140 160 180 200
IOUTN [mA]
4) Turn-on Waveform by EN1 & EN2
VCC = PVCC = 3.7 V, IOUTP = IOUTN = 0 mA
R1287x001B/F (VOUTP = 5.0 V, VOUTN = −5.0 V )
(Ta = 25°C)
20
40
60
80
100 120 140 160 180 200
IOUTN [mA]
R1287x001C/G (VOUTP = 5.0 V, VOUTN = −5.0 V)
(Ta = 25°C)
EN1&EN2
EN1&EN2
VOUTP
VOUTP
VOUTN
VOUTN
IIN
30
0
IIN
R1287x
NO.EA-325-180907
R1287x001D/H (VOUTP = 5.0 V, VOUTN = −5.0 V)
(Ta = 25°C)
EN1&EN2
VOUTP
VOUTN
IIN
5) Turn-on Waveform by EN1 -> EN2
6) Turn-on Waveform by EN2 -> EN1
VCC = PVCC = 3.7 V, IOUTP = IOUTN = 0 mA
VCC = PVCC = 3.7 V, IOUTP = IOUTN = 0 mA
R1287x001B/F (VOUTP = 5.0 V, VOUTN = −5.0 V)
R1287x001D/H (VOUTP = 5.0 V, VOUTN = −5.0 V )
(Ta = 25°C)
(Ta = 25°C)
EN1
EN2
EN2
VOUTP
EN1
VOUTP
VOUTN
VOUTN
7) Turn-off Waveform by EN1 & EN2
VCC = PVCC = 3.7 V, IOUTP = IOUTN = 0 mA
R1287x001B/C/D (VOUTP = 5.0 V, VOUTN = −5.0 V)
(Ta = 25°C)
R1287x001F/G/H (VOUTP = 5.0 V, VOUTN = −5.0 V)
(Ta = 25°C)
EN1&EN2
EN1&EN2
VOUTP
VOUTP
VOUTN
VOUTN
IIN
IIN
31
R1287x
NO.EA-325-180907
8) Load Transient Response Waveform
VCC = PVCC = 3.7 V
R1287x001B/F (VOUTP = 5.0 V)
(Ta = 25°C)
VOUTP
IOUTP
R1287x001C/G (VOUTP = 5.0 V)
(Ta = 25°C)
VOUTN
IOUTN
R1287x001C/G (VOUTN = −5.0 V)
(Ta = 25°C)
VOUTP
VOUTN
IOUTP
IOUTN
R1287x001D/H (VOUTP = 5.0 V)
(Ta = 25°C)
32
R1287x001B/F (VOUTN = −5.0 V)
(Ta = 25°C)
R1287x001D/H (VOUTN = −5.0 V)
(Ta = 25°C)
VOUTP
VOUTN
IOUTP
IOUTN
R1287x
NO.EA-325-180907
9) Standby Current vs. Temperature
R1287xxxxy
10) UVLO Voltage vs. Temperature
R1287xxxxy
2.36
1.0
2.34
VUVLO [V]
Istandyby [µA]
0.8
0.6
Vcc=3.7V
0.4
Vcc=5.5V
2.32
2.30
UVLO Release Voltage
2.28
UVLO Detect Voltage
2.26
0.2
2.24
0.0
2.22
-0.2
-40
-20
0
20
Ta [°C]
40
60
-40
-20
0
20
40
60
80
Ta [°C]
11) VOUTP Voltage vs. Temperature
VCC = 3.7 V
R1287x002y
12) VOUTN Voltage vs. Temperature
VCC = 3.7 V
R1287x002y
5.05
-4.95
5.04
-4.96
5.03
-4.97
5.02
-4.98
VOUTN [V]
VOUTP [V]
2.20
80
5.01
5.00
-4.99
-5.00
4.99
-5.01
4.98
-5.02
4.97
-5.03
4.96
-5.04
-5.05
4.95
-40
-20
0
20
Ta [°C]
40
60
-40
80
13) VFBP Voltage vs. Temperature
VCC = 3.7 V
R1287x001y
-20
0
20
40
60
80
Ta [°C]
14) VFBN Voltage vs. Temperature
VCC = 3.7 V
R1287x001y
1.010
0.03
1.008
0.02
1.004
VFBNO [V]
VFBP [V]
1.006
1.002
1.000
0.01
0.00
0.998
-0.01
0.996
0.994
-0.02
0.992
-0.03
0.990
-40
-20
0
20
Ta [°C]
40
60
80
-40
-20
0
20
Ta [°C]
40
60
80
33
R1287x
NO.EA-325-180907
15) IFBN Current vs. Temperature
VCC = 3.7 V
R1287x001y
6.80
IFBN [µA]
6.75
6.70
6.65
6.60
6.55
6.50
-40
-20
0
20
Ta [°C]
40
60
80
16) PWM Oscillator Frequency vs. Temperature
VCC = 3.7 V
R1287xxxxC
R1287xxxxD
1100
330
1080
1060
fosc[kHz]
fosc[kHz]
320
310
300
1040
1020
1000
980
290
960
940
280
920
900
270
-40
-20
0
20
Ta [°C]
40
60
100
100
98
98
96
96
R1287xxxxC
94
R1287xxxxB/D
92
90
-20
0
20
Ta [°C]
40
60
80
18) CH2 Maximum Duty Cycle vs. Temperature
VCC = 3.7 V
R1287xxxxy
Maxduty2[%]
Maxduty1[%]
17) CH1 Maximum Duty Cycle vs. Temperature
VCC = 3.7 V
R1287xxxxy
R1287xxxxC
94
R1287xxxxB/D
92
90
88
-40
34
-40
80
-20
0
20
Ta [°C]
40
60
80
88
-40
-20
0
20
Ta [°C]
40
60
80
R1287x
NO.EA-325-180907
20) EN2 H/L Input Voltage vs. Temperature
VCC = 3.7 V
R1287xxxxy
0.94
0.94
0.92
0.92
0.90
0.90
VEN2 [V]
VEN1 [V]
19) EN1 H/L Input Voltage vs. Temperature
VCC = 3.7 V
R1287xxxxy
0.88
0.86
0.86
0.84
0.84
0.82
0.82
-40
-20
0
20
Ta [°C]
40
60
-20
0
20
40
60
80
Ta [°C]
22) Inverting Pch Current Limit vs. Temperature
R1287xxxxy
1300
1800
1200
1700
1100
1600
ILIMXLN [mA]
ILIMLXP [mA]
-40
80
21) Boost Nch Current Limit vs. Temperature
R1287xxxxy
1000
Vcc=2.5V
900
Vcc=3.7V
800
1500
Vcc=2.5V
1400
Vcc=3.7V
1300
Vcc=5.5V
Vcc=5.5V
1200
700
600
1100
-40
-20
0
20
Ta [°C]
40
60
-40
80
23) CH1 Soft-Start Time vs. Temperature
R1287xxxxy
-20
0
20
Ta [°C]
40
60
4.0
2.6
3.9
2.5
3.8
2.4
3.7
2.3
3.6
3.5
2.2
2.1
3.4
Vcc=2.5V
2.0
Vcc=2.5V
3.3
Vcc=3.7V
1.9
Vcc=3.7V
Vcc=5.5V
1.8
Vcc=5.5V
3.2
80
24) CH2 Soft-Start Time vs. Temperature
R1287xxxxy
tssn [ms]
tssp [ms]
0.88
1.7
3.1
1.6
3.0
-40
-20
0
20
Ta [°C]
40
60
80
-40
-20
0
20
Ta [°C]
40
60
80
35
R1287x
NO.EA-325-180907
25) Delay Time for Protection vs. Temperature
VCC = 3.7 V
R1287xxxxy
34
32
tprot [ms]
30
28
26
R1287xxxxB
24
R1287xxxxC
22
R1287xxxxD
20
-40
36
-20
0
20
Ta [°C]
40
60
80
POWER DISSIPATION
WLCSP-12-P1
Ver. A
The power dissipation of the package is dependent on PCB material, layout, and environmental conditions.
The following conditions are used in this measurement.
Measurement Conditions
Standard Test Land Pattern
Environment
Mounting on Board (Wind Velocity = 0 m/s)
Board Material
Glass Cloth Epoxy Plastic (Double-sided)
Board Dimensions
40 mm x 40 mm x 1.6 mm
Top Side: Approx. 80%
Copper Ratio
Bottom Side: Approx. 90%
φ 0.6 mm × 31 pcs
Through-holes
Measurement Result
(Ta = 25°C, Tjmax = 125°C)
Standard Test Land Pattern
Power Dissipation
1000 mW
Thermal Resistance
θja = (125 − 25°C) / 1.0 W = 100°C /W
40
1200
1000
Standard Test
Land Pattern
800
40
Power Dissipation PD (mW)
1000
600
400
200
0
0
25
50
75 85 100
125
150
IC Mount Area (mm)
Ambient Temperature (°C)
Power Dissipation vs. Ambient Temperature
Measurement Board Pattern
i
PACKAGE DIMENSIONS
WLCSP-12-P1
Ver. A
WLCSP-12-P1 Package Dimensions (Unit: mm)
i
Visual Inspection Criteria
WLCSP
VI-160823
No.
1
Inspection Items
Package chipping
2
Si surface chipping
3
No bump
Marking miss
4
Inspection Criteria
Figure
A≥0.2mm is rejected
B≥0.2mm is rejected
C≥0.2mm is rejected
And, Package chipping to Si surface
and to bump is rejected.
A≥0.2mm is rejected
B≥0.2mm is rejected
C≥0.2mm is rejected
But, even if A≥0.2mm, B≤0.1mm is
acceptable.
No bump is rejected.
To reject incorrect marking, such as
another product name marking or
5
6
7
No marking
Reverse direction of
marking
Defective marking
8
Scratch
9
Stain and Foreign
material
another lot No. marking.
To reject no marking on the package.
To reject reverse direction of marking
character.
To reject unreadable marking.
(Microscope: X15/ White LED/ Viewed
from vertical direction)
To reject unreadable marking
character by scratch.
(Microscope: X15/ White LED/ Viewed
from vertical direction)
To reject unreadable marking
character by stain and foreign material.
(Microscope: X15/ White LED/ Viewed
from vertical direction)
i
POWER DISSIPATION
DFN3030-12
Ver. A
The power dissipation of the package is dependent on PCB material, layout, and environmental conditions.
The following measurement conditions are based on JEDEC STD. 51-7.
Measurement Conditions
Item
Measurement Conditions
Environment
Mounting on Board (Wind Velocity = 0 m/s)
Board Material
Glass Cloth Epoxy Plastic (Four-Layer Board)
Board Dimensions
76.2 mm × 114.3 mm × 0.8 mm
Copper Ratio
Outer Layer (First Layer): Less than 95% of 50 mm Square
Inner Layers (Second and Third Layers): Approx. 100% of 50 mm Square
Outer Layer (Fourth Layer): Approx. 100% of 50 mm Square
Through-holes
φ 0.3 mm × 32 pcs
Measurement Result
(Ta = 25°C, Tjmax = 125°C)
Item
Measurement Result
Power Dissipation
3400 mW
Thermal Resistance (θja)
θja = 29°C/W
Thermal Characterization Parameter (ψjt)
ψjt = 3.1°C/W
θja: Junction-to-Ambient Thermal Resistance
ψjt: Junction-to-Top Thermal Characterization Parameter
4000
3400
Power Dissipation (mW)
3500
3000
2500
2000
1500
1000
500
0
0
25
50
75 85
100
125
Ambient Temperature (°C)
Power Dissipation vs. Ambient Temperature
Measurement Board Pattern
i
PACKAGE DIMENSIONS
DFN3030-12
Ver. A
3.0
A
B
7
12
X4
0.40±0.05
※
0.1
1.7±0.1
3.0
2.5±0.1
C 0.35
0.203 typ
0.8 max.
INDEX
S
6
1
0.5
0.25±0.05
0.05 M AB
Bottom View
0.05 S
DFN3030-12 Package Dimensions (Unit: mm)
*
∗ The tab on the bottom of the package is substrate level (GND). It is recommended that the tab be connected to the
ground plane on the board, or otherwise be left floating.
i
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 our 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 our company.
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
our company'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 our sales or our distributor before attempting to use
AOI.
11. Please contact our sales representatives should you have any questions or comments concerning the products or
the technical information.
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https://www.nisshinbo-microdevices.co.jp/en/
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https://www.nisshinbo-microdevices.co.jp/en/buy/
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