RICOH R1286K Technical data
R1286K Series
OU
PWM Step-up/Inverting DC/DC Converter for AMOLED/LCD with synchronous rectifier
The R1286K Series are CMOS-based PWM step-up/inverting DC/DC converters featuring 250mA×2 output current with synchronous rectifier. R1286K
includes a soft start circuit, an under-voltage lockout circuit (UVLO), a latch protection circuit, a thermal shutdown circuit, and a shutdown circuit. By simply
using two inductors and three capacitors as external components, a high-efficiency step-up/inverting DC/DC c onverter can be eas ily configured. R1286K is
available in two types: R1286K001B is the type to which the output voltage (V
type to which the step-up output voltage (V
OUTP
) is internally fixed and the inverting output voltage (V
interface. The R1286K has a sequenced start up. After the CE pin is enabled, the step-up output is starting up followed by the inverting output after a delay
time. As for shutdown, both outputs will be turned off by the auto-discharge function. R1286K is used for applications such as LCD and AMOLED displays.
FEATURES
• Supply Current (ICC)·······················Typ. 1.2mA (VCC=4.8V, In non-switching)
• Standby Current (Istandby) ················Max. 5μA (VCC=VLXP=4.8V, CE="L")
• Input Voltage Range (VIN)··············2.3V to 4.8V
• Step-up Output Voltage (VOUTP) ·····4.6V to 5.8V (internally fixed),
Externally adjustable (VFB: 1V) (001B)
• Inverting Output Voltage (VOUTN)····-2.0V to -6.0V (internally fixed),
FB: 0V) (001B)
• Feedback Voltage Accuracy··········
Externally adjustable (V
Dynamically adjustable output voltage with single wire interface.
Step-up
: ±
9mV (Except B), ± 15mV (B)
: ±
Inverting
70mV (Except B) , ± 25mV (B)
BLOCK DIAGRAM
R1286KxxxA/C~M R1286K001B
SELECTION GUIDES
Halogen Free
*) R1286KxxxI does not exist. For information about the versions, Please contact us.
) The tab is substrate level (GND).
∗
• Power source for AMOLED and LCD • Power source for hand-held equipment
Package
DFN(PLP)2730-12 5,000 pcs
Q'ty per Reel
Part No.
R1286Kxxx.$ -TR
R1286K001$ -TR
PACKAGE TYPICAL CHARACTERISTICS
DFN(PLP)2730-12
1
2
3
4
5
6
xxA/C～M
V
OUTNS
V
LXN
PVCC
VCC
GND
Top View
12 7 8 9 10 11
1 6 5 4 3 2
001B
FBN
V
OUTN
Bottom View
7 121110 9 8
6 123 4 5
xxA/C～M
7
8
9
VOUTPS
10
11
12
∗
PGND
VOUTP
TST
L
CE
XP
001B
VFBP
VREF
APPLICATIONS
OUTP
and V
OUTN
) can be adjusted by external resistors. R1286KxxxA/C~M are the
OUTN
) can be adjusted dynamically by the single wire
• Output Current (IOUT) ······················
Step-up:250mA, Inverting:250mA
• Oscillator Frequency (fosc)················ 1.75MHz
•
Maximum Duty Cycle (Maxduty)
• UVLO Detect Voltage (VUVLO)··········· Typ. 2.05V
• Soft Start Time (tSSP) ························
•
Coil-current Limit Circuit
,
• Latch Protection Circuit····················
························
···········
Step-up: Typ. 85% , Inverting: Typ. 90%
Step-up: Typ. 2.4ms, Inverting: Typ. 2.8ms(B)
Step-up: Typ. 1A, Inverting: Typ. 1.5A
Delay time for protection Typ. 16ms
• Auto-Discharge function
• Thermal Shutdown Circuit ·············· Stops at 150°C
• Package··········································· DFN(PLP)2730-12
TYPICAL APPLICATION
VOUTN
C2
C1
xxx :
Serial number to specify a combination of the V
value. The externally adjustable output voltage type is (001).
$
:Specify designation method of V
(A/C to M*) V
OUTN
V
(B) V
OUTP
voltage and V
voltage can be adjusted dynamically by the single wire interface.
OUTP
and V
OUTN
are externally adjusted.
R1286Kxxxx Efficiency vs. Output Current
100
90
80
70
60
50
Efficiency[%]
40
30
20
(VOUTP=4.6V, VOUTN= -4.9V)
Vin= 4.2 V
Vin= 3.7 V
Vin= 2.9 V
0 25 50 75 100 125 150 175 200 225 250 275 300
I
P [m A]
OUT
R4
R5
VOUTN
C2
C1
OUTP
and V
OUTN
preset value are internally fixed.
100
90
80
70
60
50
Efficiency[%]
40
30
20
0 25 50 75 100 125 150 175 200 225 250 275 300
R1286KxxxA/C~M
V
OUTNS
V
OUTN
LXN
CC
V
GND
R1286K001B
FBN
V
OUTN
V
LXN
PV
CC
V
CC
GND
OUTN
settings..
TST
CE
V
OUTPS
V
OUTP PVCC
XP
L
PGND
C4
V
REF
CE
FBP
V
C5
R3
OUTP
V
L1
L
XP
PGND
OUTP
voltage and V
(VOUTP=5.4V, VOUTN= -5.4V)
I
N [mA ]
OUT
EN con trol
S-Wir e
C3
EN contr ol
R1
R2
OUTN
Vin= 4.2 V
Vin= 3.7 V
Vin= 2.9 V
OUTP
V
V
TP
C3
preset
No.EK-283-120531 Step-up/Inverting DC/DC Converter
R1286K Series Step-up/Inverting DC/DC Converter
PWM Step-up/Inverting DC/DC Converter for AMOLED/LCD with synchronous rectifier
Comparison of Step-up/Inverting DC/DC Converters
Product Name
Application AMOLED / LCD ← AMOLED / LCD / CCD
Control PWM(Step-up), PWM (Inverting) ← ←
Rectifier Synchronous Rectifier Diode Rectifier ←
Supply Current
(In non-switching）
Input Voltage Range 2.3V to 4.8V ← 2.5V to 5.5V
Step-up
Ext. adjustable between 4.6V and 5.8V (001B)
Output Voltage
Range
Inverting
Ext. adjustable between -2.0V and -6.0V(001B),
Dynamically adjustable inverting voltage
Oscillator Frequency Typ. 1.75MHz Typ. 1.4MHz
Maximum Duty Cycle
Delay time for
latch protection
UVLO Detect Voltage Typ. 2.05V ← Typ. 2.15V
Soft Start Time
Lx Current limit
Step-up Typ. 1.0A ← Typ. 1.5A
Inverting Typ. 1.5A ← Typ. 1.5A
Package DFN(PLP)2730-12 DFN2730-12 DFN(PLP)2730-12
Others
R1286K Series R1285LSeries (Limited) R1283K Series
Typ. 250μA (300kHz)
Typ. 1.2mA
Typ. 350μA
Typ. 300
Typ. 350
4.6V to 5.8V or
4.6V, 4.8V, 5.0V
Ext. adjustable up to 20V
-2.0V to -6.0V or
with single wire interface. (V
OUTN
-2.0V to -6.0V or
Ext. adjustable up to -6.0V (B)
)
Ext. adjustable up to VDD-20V
Typ. 300kHz (A),
Typ. 700kHz (B),
Typ. 1.4MHz (C)
Step-up Typ. 85%
Inverting Typ. 90%
←
Step-up Typ. 91%
Inverting Typ. 91%
Typ. 16ms Typ. 50ms ←
Step-up Typ. 2.4ms
Inverting Typ. 2.8ms（B）
Auto-Discharge function,
Sequence Control,
Shutdown Function,
Step-up Typ. 4.5ms
Inverting Typ. 4.5ms
Auto-Discharge function,
Sequence Control,
Shutdown Function
Auto-Discharge function
(Inverting output),
Sequence Control,
Thermal Shutdown Circuit
μ
A (700kHz)
μ
A (1.4MHz)
←
The currently available information as of May 2012 is provided in this New Product News.
EK-283-120531
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