ROHM BD6586MUV

1/4
z Structure
Silicon Monolithic Integrated Circuit
z Product Name
Step-up DC/DC converter for medium size LCD panel
z Type
BD6586MUV
z Features
High efficiency PWM step-up DC/DC converter (fsw=1MHz)
High accuracy and good matching current driver 4ch
Drive up to 6 in series × 4 strings in parallel =24white LEDs
(*white LED Vf=4.0Vmax)
o
zAbsolute maximum ratings (Ta=25 C)
Parameter
Symbol
Limits
Unit
Condition
Maximum applied voltage 1
VMAX1
7
V
VBAT, EN1, EN2, TRSW, PWM,
TESTO, ISET, TEST
Maximum applied voltage 2
VMAX2
25
V
LED1, LED2, LED3, LED4,
Maximum applied voltage 3
VMAX3
30.5
V
SW
Maximum applied voltage 4
VMAX4
50.5
V
VDET
Power dissipation 1
Pd1
500
mW
*1
Power dissipation 2
Pd2
780
mW
*2
Power dissipation 3
Pd3
1510
mW
*3
Operating temperature range
Topr
-40 ~ +85
o
C
-
Tstg
-55 ~ +150
o
C
-
Storage temperature range
o
o
(*1) It will be reduced every 4.0mW/ C (Ta>25 C) when it’s not mounted on a heat radiation Board.
(*2) it will be reduced every 6.2mW/oC (Ta>25oC) when It’s not mounted on 1 layer board (ROHM Standard board) and Copper foil area 0mm2
(*3) It will be reduced every 12.1mW/oC (Ta>25oC) when it’s mounted on 4 layer board (JEDEC Compliant board) and Copper foil area 6.28mm2 on
1st layer and Copper foil area 5655.04mm2. 2nd-4th layer.
zOperating conditions (Ta=-40 to +85oC)
Parameter
Supply voltage
Symbol
VBAT
Min.
Rating
Typ.
Max.
2.7 ~ 5.5
Unit
Condition
V
This product isn’t designed to protect itself against radioactive rays.
Status of this document
The English version of this document is the formal specification.
A customer may use this translation version only for a reference to help reading the formal version.
If there are any differences in translation version of this document, formal version takes priority.
Application example
▪ ROHM cannot provide adequate confirmation of patents.
▪ The product described in this specification is designed to be used with ordinary electronic equipment or devices (such as audio-visual
equipment,
office-automation equipment, communications devices, electrical appliances, and electronic toys).
Should you intend to use this product with equipment or devices which require an extremely high level of reliability and the malfunction of which
would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers,
fuel
controllers and other safety devices), please be sure to consult with our sales representative in advance.
▪ ROHM assumes no responsibility for use of any circuits described herein, conveys no license under any patent or other right, and makes no
representations that the circuits are free from patent infringement.
Rev.A
2/4
zElectrical Characteristics
o
(Unless otherwise noted, VBAT=3.6V, Ta = +25 C)
Parameter
Symbol
Min.
Spec
Typ.
Max.
-
0.4
Unit
Condition
EN1, EN2, PWM Pin
Low Input Voltage range
VthL
0
High Input Voltage range
VthH
1.4
-
5.5
V
Iin
-
8.3
16.0
µA
Input voltage=2.5V
V
VBAT falling edge
Input current
UVLO
Under Voltage Lock Out
V
UVLO
2.05
2.35
2.65
Switching Regulator
Quiescent Current
Iq
-
0.1
2.0
µA
EN1=EN2=PWM=0V
Current Consumption
Idd
-
2.2
4.6
mA
VDET=0V,ISET=24kΩ
LED Control voltage
VLED
0.4
0.5
0.6
V
Over Current Limit
Ocp
1.1
1.5
2.5
A
*1
SBD Open Protect
Sop
-
-
0.1
V
Detect voltage of VDET pin
Switching frequency
fSW
0.7
1.0
1.3
MHz
Duty cycle limit
Duty
91
95
99
%
LED1-4=0.3V
Over Voltage Limit
Ovl
25.0
25.5
26.0
V
LED1-4=0.3V
RSW
-
0.24
0.32
Ω
Isw=100mA
Current driver
LED maximum current
ILMAX
-
-
25
mA
LED current accuracy
ILACCU
-
-
±5
%
ILED=20mA
%
▪Each LED current/Average
(LED1- 4 current)
SW Transistor On Resistance
LED current matching
ILMAT
-
-
±3
▪ILED=20mA
ISET voltage
LED current limiter
LED Terminal
Over Voltage Protect
Iset
0.5
0.6
0.7
V
ILOCP
35
60
90
mA
LEDOVP
10.0
11.5
13.0
V
*1. This parameter is tested with dc measurement
Rev.A
ISET resistance 4.7kΩ
LED1- 4 =0.5V
EN1=EN2=PWM=2.5V
3/4
zPackage outline drawing
zTerminals
Type
D6586
LOT No.
(VQFN024V4040) (Unit : mm)
PIN
PIN Name
1
VBAT
2
EN1
3
EN2
4
GND
5
PWM
6
ISET
7
GND
8
LED1
9
LED2
10
GND
11
LED3
12
LED4
13
TEST
14
TESTO
15
N.C.
16
SW
17
SW
18
SW
19
VDET
20
N.C.
21
PGND
22
PGND
23
N.C.
24
TRSW
zBlock diagram
VBAT
EN1 EN2
SBD OPEN/
Output short PROTECT
TSD
VDET
Reference
UVLO
Output Over Voltage PROTECT
+
TRSW
LED TERMINAL
OPEN/SHORT DETECTOR
SW
SW
Soft start
SW
ERRAMP
Pulse
Control
LED1
-
PWM COMP
+
LED2
LED
RETURN
SELECT
+
LED3
LED4
+
OSC
Current
SENCE
4ch
PGND
+
-
PGND
ISET
Resistor driver
N.C.
GND
TEST
TESTO
N.C.
N.C.
PWM
ISET
Current Driver
GND
Rev.A
GND
4/4
zCautions on use
(1) Absolute Maximum Ratings
An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions,
etc., can break down devices, thus making impossible to identify breaking mode such as a short circuit or an open
circuit. If any special mode exceeding the absolute maximum ratings is assumed, consideration should be given to
take physical safety measures including the use of fuses, etc.
(2) Power supply and GND line
Design PCB pattern to provide low impedance for the wiring between the power supply and the GND lines. Pay
attention to the interference by common impedance of layout pattern when there are plural power supplies
and GND lines. Especially, when there are GND pattern for small signal and GND pattern for large current
included the external circuits, please separate each GND pattern. Furthermore, for all power supply terminals to
ICs, mount a capacitor between the power supply and the GND terminal. At the same time, in order to use a
capacitor, thoroughly check to be sure the characteristics of the capacitor to be used present no problem including
the occurrence of capacity dropout at a low temperature, thus determining the constant.
(3) GND voltage
Make setting of the potential of the GND terminal so that it will be maintained at the minimum in any operating state.
Furthermore, check to be sure no terminals are at a potential lower than the GND voltage including an actual
electric transient.
(4) Short circuit between terminals and erroneous mounting
In order to mount ICs on a set PCB, pay thorough attention to the direction and offset of the ICs. Erroneous
mounting can break down the ICs. Furthermore, if a short circuit occurs due to foreign matters entering
between terminals or between the terminal and the power supply or the GND terminal, the ICs can break
down.
(5) Operation in strong electromagnetic field
Be noted that using ICs in the strong electromagnetic field can malfunction them.
(6) Input terminals
In terms of the construction of IC, parasitic elements are inevitably formed in relation to potential. The operation of
the parasitic element can cause interference with circuit operation, thus resulting in a malfunction and then
breakdown of the input terminal. Therefore, pay thorough attention not to handle the input terminals, such as to
apply to the input terminals a voltage lower than the GND respectively, so that any parasitic element will operate.
Furthermore, do not apply a voltage to the input terminals when no power supply voltage is applied to the IC. In
addition, even if the power supply voltage is applied, apply to the input terminals a voltage lower than the power
supply voltage or within the guaranteed value of electrical characteristics. And, as the unused input terminals may
make unstable state occur in the internal circuit, please connect them to I/O GND.
(7) External capacitor
In order to use a ceramic capacitor as the external capacitor, determine the constant with consideration given to a
degradation in the nominal capacitance due to DC bias and changes in the capacitance due to temperature, etc.
(8) Thermal shutdown circuit (TSD)
When junction temperatures become 175°C (typ) or higher, the thermal shutdown circuit operates and turns a
switch OFF. The thermal shutdown circuit, which is aimed at isolating the LSI from thermal runaway as much
as possible, is not aimed at the protection or guarantee of the LSI. Therefore, do not continuously use the
LSI with this circuit operating or use the LSI assuming its operation.
(9) Thermal design
Perform thermal design in which there are adequate margins by taking into account the permissible
dissipation (Pd) in actual states of use.
(10) DC/DC converter
Please select the low DCR inductors to decrease power loss for DC/DC converter.
Rev.A
Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level
of reliability and the malfunction of which would directly endanger human life (such as medical
instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers
and other safety devices), please be sure to consult with our sales representative in advance.
It is our top priority to supply products with the utmost quality and reliability. However, there is always a chance
of failure due to unexpected factors. Therefore, please take into account the derating characteristics and allow
for sufficient safety features, such as extra margin, anti-flammability, and fail-safe measures when designing in
order to prevent possible accidents that may result in bodily harm or fire caused by component failure. ROHM
cannot be held responsible for any damages arising from the use of the products under conditions out of the
range of the specifications or due to non-compliance with the NOTES specified in this catalog.
Thank you for your accessing to ROHM product informations.
More detail product informations and catalogs are available, please contact your nearest sales office.
ROHM Customer Support System
www.rohm.com
Copyright © 2008 ROHM CO.,LTD.
THE AMERICAS / EUROPE / ASIA / JAPAN
Contact us : [email protected] rohm.co. jp
21 Saiin Mizosaki-cho, Ukyo-ku, Kyoto 615-8585, Japan
TEL : +81-75-311-2121
FAX : +81-75-315-0172
Appendix1-Rev2.0