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参数资料
| 型号： | R1285L332A-TR-F |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PDSO12 |
| 封装： | 2.7 X 3 MM, LEAD FREE, DFN-12 |
| 文件页数： | 1/2页 |
| 文件大小： | 188K |
| 代理商： | R1285L332A-TR-F |
R1285L Series
PWM Step-up/Inverting DC/DC Converter for AMOLED
No.EK-208-091101
Step-up/Inverting DC/DC Converter
The R1285L Series are dual output CMOS-based PWM step-up/inverting DC/DC converters. R1285L includes a soft start circuit, an
under-voltage lockout circuit (UVLO) and a latch type protection circuit. By simply using inductors, capacitors, and (resistors) as
external components, a high-efficiency step-up/inverting DC/DC converter can be easily configured. The Inverting DC/DC converter
can be started after Step-up DC/DC converter by sequence control. At the standby mode, the internal shutdown switch can separate
the output from the input.
FEATURES
Supply Current (I
DD1
) Typ. 4mA (VIN=4.8V, In switching)
Supply Current (I
DD2
) Typ. 350
μA (VIN=4.8V, In non-switching)
Standby Current (I
standby
) Max. 3
μA (VIN=4.8V, CE="L")
Input Voltage Range (V
IN
) 2.3V to 4.8V
Step-up Output Voltage Range (V
OUTP
) Select from 4.6V, 4.8V or 5.0V
Inverting Output Voltage Range (V
OUTN
) -2.0V to -6.0V (A Version)
The output voltage adjustable up to -6V
with an external resistor.
(Feed back voltage 0V) (B Version)
Step-up Output Voltage Accuracy ± 1.5%
Inverting Output Voltage Accuracy ± 1.5% (A Version)
± 25mV (B Version)
Output Reference Voltage (V
REF
) 1.2V (
± 28mV)
Oscillator Frequency (f
osc
) 1.4MHz
Oscillator Maximum Duty Cycle (Maxduty)Step-up :Typ. 85%
Inverting :Typ. 90%
UVLO Detect Voltage (V
UVLO
) Typ. 2.05V
Soft Start Time (t
start
) Typ. 4.5ms
Latch Protection Circuit Delay time for protection
Typ. 50ms
Auto-Discharge function
PackageDFN2730-12
BLOCK DIAGRAMS
R1285LxxxA
R1285L00xB
(Fixed Inverting output voltage type)
(Adjustable inverting output voltage type)
VOUTN
PGND
LXP1
PVCC
GND
TEST1
TEST2
CE
LXN
LXP2
VOUTP
VCC
Vref1
Current
Limit
PWM
Control
Maxduty
Discharge
Control
Vref3
OSC
PWM
Control
Current
Limit
Maxduty
Discharge
Control
Soft Start1
Vref2
Sequence
Control
Enable
Control
UVLO
Soft Start2
Timer
Short
Protect
VOUTN
PGND
LXP1
PVCC
GND
VFBN
VREF
CE
LXN
LXP2
VOUTP
VCC
Vref1
Current
Limit
PWM
Control
Maxduty
Discharge
Control
Vref3
OSC
PWM
Control
Current
Limit
Maxduty
Discharge
Control
Soft Start1
Vref2
Sequence
Control
Enable
Control
UVLO
Short
Protect
Soft Start2
Timer
SELECTION GUIDE
TYPICAL APPLICATIONS
Package
Quantity per Reel
Part No.
DFN2730-12
5,000 pcs
R1285L.xx$..
-TR-F
R1285LxxxA
(Fixed Inverting output voltage type)
PGND
PVCC
GND
TEST1
LXN
LXP2
VOUTP
LXP1
VCC
VOUTN
CE
TEST2
C1
4.7
μF
CE control
C2
10
μF
D2
L2
L1
C3
10
μF
D1
VOUTN
VOUTP
R1285L00xB
(Adjustable inverting output voltage type)
PGND
PVCC
GND
VFBN
LXN
LXP2
VOUTP
LXP1
VCC
VOUTN
CE
VREF
C1
4.7
μF
CE control
C2
10
μF
D2
L2
L1
D1
VOUTN
VOUTP
R3
R2
R1
C4
C5
C3
10
μF
.xx. : Specify the inverting output voltage within the range
-2.0V (.20.) to -6.0V (.60.) in 0.1V steps. For the adjustable
inverting output voltage type, .00.. (B Version)
.$. : Select the step-up output voltage from
(.1.) 4.6V, (.2.) 4.8V or (.3.) 5.0V.
.
. : Select from (.A.) Fixed Inverting output voltage type or
(.B.) Adjustable inverting output voltage type
L1,L2: VLF3010-4R7 (TDK)
SD: CRS02 (Toshiba)
L1,L2 : VLF3010-4R7 (TDK)
SD : CRS02 (Toshiba)
R1, R2: Resistors for setting VOUTN
R3: 2k
Ω,C4: 47pF, C5: 0.1μF
PACKAGE
TYPICAL CHARACTERISTIC
DFN2730-12
Bottom View
7
12
11
10
9
8
6
1
2
3
4
5
12
7
8
9
10
11
1
6
5
4
3
2
Top View
1
PGND
2
VOUTP
3
PVCC
4
VCC
5
GND
6
CE
7
TEST2
2 or VREF
8
TEST1
2 or VFBN
9
VOUTN
10
LXN
11
LXP1
12
LXP2
R1285Lxx1A/001B Efficiency vs. Output Current
) The tab is substrate level (GND).
2) The TEST1 pin and TEST2 pin connected to the GND level or should be open.
APPLICATIONS
Power source for active matrix OLED
Power source for battery-powered equipment
0 20 40 60 80 100 120 140 160 180 200
Output Current IOUT (mA)
Efficiency
η(%)
20
100
60
40
80
90
70
50
30
VOUTP=4.6V VOUT=-4.9V, Topt=25°C
VIN=4.5V
VIN=3.7V
VIN=2.9V
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