R1285L001B-TR-F [RICOH]
Switching Regulator, 1400kHz Switching Freq-Max, PDSO12, 2.7 X 3 MM, ROHS COMPLIANT, DFN-12;
| 型号： | R1285L001B-TR-F |
| 厂家： | 
RICOH ELECTRONICS DEVICES DIVISION |
| 描述： | Switching Regulator, 1400kHz Switching Freq-Max, PDSO12, 2.7 X 3 MM, ROHS COMPLIANT, DFN-12 开关 光电二极管 |
| 文件： | 总2页 (文件大小：160K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
R1285L Series
PWM Step-up/Inverting DC/DC Converter for AMOLED
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, (resistors), capacitors, and
diodes 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 (IDD1)························ Typ. 4mA (VIN=4.8V, In switching)
• Supply Current (IDD2)························ Typ. 350μA (VIN=4.8V, In non-switching)
• Standby Current (Istandby) ·················· Max. 3μA (VIN=4.8V, CE="L")
• Input Voltage Range (VIN)················ 2.3V to 4.8V
• Output Reference Voltage (VREF) ·······1.2V (± 28mV)
• Oscillator Frequency (fosc)····················1.4MHz
•
Oscillator Maximum Duty Cycle (Maxduty)····Step-up :Typ. 85%
Inverting :Typ. 90%
•
•
Step-up Output Voltage Range (VOUTP
)
····· Select from 4.6V, 4.8V or 5.0V
···· -2.0V to -6.0V (A Version)
• UVLO Detect Voltage (VUVLO)···············Typ. 2.05V
Inverting Output Voltage Range (VOUTN
)
• Soft Start Time (tstart) ····························Typ. 4.5ms
The output voltage : adjustable up to -6V • Latch Protection Circuit ·······················Delay time for protection
with an external resistor
.
Typ. 50ms
(Feedback voltage : 0V) (B Version)
• Auto-Discharge function
• Step-up Output Voltage Accuracy···· ± 1.5%
• Inverting Output Voltage Accuracy ·· ± 1.5% (A Version)
± 25mV (B Version)
• Package···············································DFN2730-12
BLOCK DIAGRAMS
R1285LxxxA
(Fixed Inverting output voltage type)
R1285L00xB
(Adjustable inverting output voltage type)
PVCC
L
XP1
XP2
PVCC
L
L
XP1
Current
Limit
Current
Limit
Maxduty
L
OSC
Maxduty
XP2
OSC
PWM
Control
PWM
Control
PWM
Control
PWM
Control
Timer
Timer
Maxduty
Current
Limit
L
XN
Maxduty
Current
Limit
L
XN
Short
Protect
PGND
V
Short
Protect
PGND
V
Discharge
Control
Discharge
Control
V
OUTN
Discharge
Control
VOUTN
Discharge
Control
OUTP
OUTP
V
FBN
REF
TEST1
TEST2
Vref3
Vref2
Vref3
Vref2
V
Vref1
Vref1
Sequence
Control
Sequence
Control
Soft Start2
Soft Start1
Soft Start2
Soft Start1
Enable
Control
Enable
Control
V
CC
UVLO
VCC
CE
UVLO
CE
GND
GND
SELECTION GUIDE
TYPICAL APPLICATIONS
R1285LxxxA
R1285L00xB
Halogen Free
Package
DFN2730-12 5,000 pcs R1285L
Q'ty per Reel
Part No.
(Fixed Inverting output voltage type) (Adjustable inverting output voltage type)
-
.
xx$..∗-TR-F
VOUTP
VOUTP
C3
10μF
C3
10μF
D1
D1
.
xx
.
: Specify the inverting output voltage within the range of
PGND
VOUTP
LXP2
LXP1
PGND
VOUTP
PVCC
LXP2
LXP1
L1
L1
-2.0V (
.
20
.
) to -6.0V (
.
60
.
) in 0.1V steps. For the adjustable
L2
L2
inverting output voltage type
(.
00
.
). (B Version)
PVCC
LXN
LXN
D2
D2
VOUTN
VOUTN
$ : Select the step-up output voltage from
.
.
VCC
VOUTN
TEST1
TEST2
VCC
VOUTN
VFBN
VREF
C1
4.7μF
C1
4.7μF
C2
10μF
C2
10μF
R2
R1
R3
(.
1
.
) 4.6V, (
.
2
.
) 4.8V or (
.
3
.
) 5.0V.
GND
CE
GND
CE
C4
C5
.
.
: Select from
(
.
A.
) Fixed Inverting output voltage type or
∗
CE control
CE control
(.
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: 2kΩ,C4: 47pF, C5: 0.1μF
PACKAGE
TYPICAL CHARACTERISTIC
Efficiency vs. Output Current
DFN2730-12
Top View
Bottom View
R1285Lxx1A/001B
R1285L49xA/00xB
12 11 10
9
8
7
7
8
9
10 11 12
∗
VOUTP=4.6V, IOUTN=0mA,Topt=25°C
VOUTN=-4.9V, IOUTP=0mA,Topt=25°C
100
100
90
80
70
60
50
40
30
20
90
80
70
60
50
40
30
20
1
2
3
4
5
6
6
5
4
3
2
1
TEST2∗2 or VREF
1
2
3
4
5
6
7
8
9
10
11
12
PGND
VOUTP
PVCC
VCC
GND
CE
TEST1∗2 or VFBN
VOUTN
LXN
LXP1
LXP2
VIN=4.5V
VIN=3.7V
VIN=2.9V
VIN=4.5V
VIN=3.7V
VIN=2.9V
0
20 40 60 80 100 120 140 160 180 200
IOUTP (mA)
0
20 40 60 80 100 120 140 160 180 200
IOUTN (mA)
) 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
No.EK-208-101001
Step-up/Inverting DC/DC Converter
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, firecontainment
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.Please contact Ricoh sales representatives should you have any questions or comments
concerning the products or the technical information.
RICOH COMPANY., LTD. Electronic Devices Company
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■
Ricoh presented with the Japan Management Quality Award for 1999.
The Ricoh Group was awarded ISO 14001 certification, which is an international standard for
environmental management systems, at both its domestic and overseas production facilities.
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Electronic Devices Company
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