R1286K SERIES
2ch DCDC (Step Up DC/DC and Inverting DC/DC)
NO.EA-283-141120
OUTLINE
The R1286 2ch DC/DC converter is designed for AMOLED display power source. It contains a step up DC/DC
converter and an inverting DC/DC converter.
Step up DC/DC converter generates boosted output voltage to 4.6V ~ 5.8V(Selectable). Inverting DC/DC
converter generates negative voltage down to -2.0V ~ -6.0V(Selectable) that is dynamically adjustable with single
wire interface signal. R1286 consist of a voltage reference, error amplifiers, an oscillator, PWM control circuits,
over current protection circuits, short protection circuits, an under voltage lockout circuit (UVLO), thermal
shutdown circuit, a NMOS driver and a synchronous PMOS switch for boost converter, a PMOS driver and a
synchronous NMOS switch for inverting converter, and so on. High efficiency boost and inverting DC/DC
converters can be composed with two external inductors and three capacitors.
FEATURES
•
Operating Voltage ................................................ 2.3V to 5.5V
•
Step Up DC/DC (CH1)
Output Voltage (V
OUTP
) ......................................... 4.6V to 5.8V (Selectable / 0.1V Step) [ R1286KxxxX ]
[ R1286K001B ]
Adjustable V
OUT
from 4.6V to 5.8V with external resistors
Output Current (I
OUTP
) ........................................... 250mA [ R1286K0xxX / R1286K001B]
300mA [ R1286K1xxX]
•
Inverting DC/DC (CH2)
Dynamically adjustable Output Voltage (V
OUTN
)…..-2.0V to -6.0V (Range is fixed 3.0V / 0.1V Step)
Single wire (S-Wire) interface (Default Value is Selectable / 0.1V Step)
[ R1286KxxxX ]
[ R1286K001B ]
Adjustable V
OUT
from -2.0V to -6.0V with external resistors
Output Current (I
OUTN
) ........................................... 250mA [ R1286K0xxX / R1286K001B]
300mA [ R1286K1xxX]
•
Control and Protection
Internal start up sequence control with soft start operation
Auto discharge operation for both outputs
•
Over current protection
................................................
Typ.1.0A(boost)/1.5A(inverting) ····· [ R1286K0xxX ]
Typ.1.1A(boost)/1.8A(inverting) ····· [ R1286K1xxX ]
Short circuit protection
UVLO(Under voltage lock out) protection ............ 2.05V
Thermal shutdown ............................................... 150°C
Operating frequency ............................................ 1750kHz
Maximum Duty Cycle ........................................... 85% for boost converter / 90% for inverting converter
•
Package ............................................................... DFN(PLP)2730-12
APPLICATION
•
Fixed voltage power supply for portable equipment
•
Fixed voltage power supply for AMOLED, LCD
1
R1286K
SELECTION GUIDE
The inverting output voltage (V
OUTN
), the positive output voltage (V
OUTP
) and the versions of the inverting output
voltage are user-selectable options.
Product Name
R1286K$xx∗-TR
Package
DFN(PLP)2730-12
Quantity per
Reel
5,000pcs
Pb
Free
Yes
Halogen
Free
Yes
$: Delay Time for Protection setting serial number
(0) Typ:16msec
(1) Typ:40msec *1) A/C~G version only
xx: Output voltage (V
OUTP
and V
OUTN
default value) setting serial number
Further, refer to the
voltage combination list.
∗
: Designation of method of setting Vout
(A/C~G) Dynamically adjustable output voltage version with S-Wire (V
OUTN
)
Fixed output version (V
OUTP
)
(B) Adjustable output voltage with external resistors version(V
OUTP
& V
OUTN
)
∗
A
B
C
D
E
F
G
Designation of method of setting Vout
Fixed and Dynamically adjustable output voltage
version
Adjustable output voltage with external resistors
version
Fixed and Dynamically adjustable output voltage
version
V
ONDEF *2)
-5.4~-2.4V
-
-5.0~-2.4V
-5.2~-2.4V
-5.6~-2.6V
-5.8~-2.8V
-6.0~-3.0V
V
ONMIN*2)
-5.4V
-
-5.0V
-5.2V
-5.6V
-5.8V
-6.0V
V
ONMAX*2)
-2.4V
-
-2.0V
-2.2V
-2.6V
-2.8V
-3.0V
T
TRA *3)
10ms
-
10ms
10ms
10ms
10ms
10ms
*2) V
ONDEF
is V
OUTN
default value. This voltage is fixed (Selectable / 0.1V Step).
V
ONMIN
is V
OUTN
minimum value with S-Wire
.
V
ONMAX
is V
OUTN
maximum value with S-Wire
.
*3) T
TRA
is transient time per 0.1V with S-Wire.
Further, refer to the
TIMING CHART.
4
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