R1282D Series
PWM Step-up/Step-down DC/DC Controller for LCD/CCD
The R1282D Series are low supply current dual output CMOS-based PWM step-up/step-down DC/DC controllers. R1282D includes a
soft start circuit, an under-voltage lockout circuit (UVLO), and a latch type protection circuit. By simply using inductors, resistors,
capacitors, power MOS, and diodes, as external components, a high-efficiency step-up/step-down DC/DC converter can be easily configured.
The oscillator maximum duty cycle, phase compensation, and soft start time can be set with an external resistor and capacitor.
FEATURES
•
Supply Current (I
DD
) ······································· Typ. 1.4mA (V
IN
=5.5V, EXT at no load)
•
Input Voltage Range (V
IN
) ······························ 2.5V to 5.5V
•
Step-up Feedback Voltage (V
FB1
) ·················· 1.0V
•
Step-down Feedback Voltage (V
FB2
)·············· 1.0V
•
Feedback Voltage Accuracy ··························
±
1.5%
•
Reference Voltage Output (V
REFOUT
) ·············· 1.5V (± 15mV)
•
Oscillator Frequency (f
osc
)···············700kHz
•
UVLO Detect Voltage (V
UVLO
) ··········2.2V
•
Latch Type Protection Circuit··········Delay time for protection
•
•
Typ. 100ms
Package··········································SON-10
Ceramic capacitors can be used. ···10μF or more
BLOCK DIAGRAM
R1282D002A
DTC1
4
TYPICAL APPLICATION
R1282D002A
V
OUT1
C1
C3
SD
L1
V
FB1
5
OSC
1
EXT1
NMOS
R1
CH1
Vref1
1 EXT1
2 GND
C6
C9
R2
R5
R11 C4
R7
4 DTC1
R8
EXT2 10
V
IN
9
PMOS
L2
V
OUT2
AMPOUT1
3
9
V
IN
3 AMPOUT1
V
REFOUT
8
R9
DTC2 7
C5
5 V
FB1
V
FB2
6
R10
SD
R6
R4
C2
C8
C7
R3
V
REFOUT
8
Vrefout
UVLO
2
GND
V
FB2
6
Vref2
10
EXT2
Latch
Delay Circuit
CH2
L1, L2 : 6.8μH, SD : FS1J3, NMOS : IRF7601, PMOS : Si3443DV, C1=C2=10μF
7
DTC2
SELECTION GUIDE
Package
SON-10
Quantity per Reel
3,000 pcs
Part No.
R1282D002A-TR-F
PACKAGE
SON-10
Top View
10 9
8
7
6
TYPICAL CHARACTERISTICS
R1282D002A Efficiency vs. Output Current
8
9 10
Bottom View
6
7
∗
90
80
70
60
50
40
30
20
10
0
L1=6.8μH,C1=10μF,V
OUT2
=2.5V,I
OUT2
=0mA
90
80
70
60
50
40
30
20
10
0
L2=6.8μH,C2=10μF,V
OUT1
=10V,I
OUT1
=0mA
Efficiency
η
(%)
1
2
3
4
5
5
4
3
2
1
1
2
3
4
5
6
7
8
9
10
EXT1
GND
AMPOUT1
DTC1
V
FB1
V
FB2
DTC2
V
REFOUT
V
IN
EXT2
V
OUT1
=5V
V
OUT1
=10V
V
OUT1
=15V
0
50
100
150
Output Current I
OUT
(mA)
200
Efficiency
η
(%)
V
OUT2
=1.8V
V
OUT2
=2.5V
0
100 200 300 400 500
Output Current l
OUT
(mA)
600
∗)
The tab suspension leads on back side are substrate level (GND).
APPLICATIONS
•
Power source for hand-held equipment
No.EK-118-091101
•
Power source for LCD and CCD
Step-up/Step-down 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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