ROHM BD6581GU Technical data
･14･
t
100
B
GND
6-Channel White LED Driver
for up to 72 LEDs
BD6581GU
●General Description
BD6581GU is white LED driver IC with PWM step-up
DC/DC converter that can boost max 42.5V and
current driver that can drive max 25mA. The wide and
precision brightness can be controlled by external
PWM pulse.
BD6581GU has very accurate current drivers, and it
has few current errors between each strings.
So, it will be helpful to reduce brightness spots on the
LCD.
Small package type is suited for saving space.
●Features
High efficiency PWM step-up DC/DC converter
(fsw=1MHz), max efficiency 93%
High accuracy & good matching (±1.5%) current
drivers 6ch
Drive up to 12
＊
in series, 6 strings in parallel =72
white LEDs (＊white LED Vf=3.5Vmax)
Rich safety functions
・Over-voltage protection (OVP)
・Over current limit
・External SBD open detect
・Thermal shutdown
●Ty pical A pplication Circuit
Battery
10F
RTR020N05
m
Powe r
ON/OFF
200Hz
PWM
1F
4.7H
2 .2F *
SW
SENSP
SENSN
RST
PWMPOW
PWMDRV
VBAT
VREG
GN
Figure 1. Typical Application Circuit
BD6581GU
TEST
GNDGND
●Key Specification
Operating power supply voltage range: 2.7V ~ 22.0V
Quiescent Current 1: 0.6A (Typ.)
Quiescent Current 2: 4.6A (Typ.)
Operating temperature range: -30℃ ~+85℃
●Package W(Typ.) x D(Typ.) x H(Max.)
VCSP85H2: 2.60mm x 2.60mm x 1.00mm
[bottom view]
ELED6 LED5 LED4 LED3 LED2
D RSTB GND FAILSEL GND LED1
CVBAT PWMPOW VREG ISETL PWMDRV
B N.C - TEST ISETH GND
A VDET N.C SW SENSP SENSN
●Application
All middle size LCD equipments backlight of Notebook
PC, portable DVD player, car navigation systems, etc.
FAILSEL
VDET
Each 20mA
ISET H
24k
ISETL
LED1
LED2
LED3
LED4
LED5
LED6
Datashee
1 2 3 4 5
10LED x 6parallel
○Product structure：Silicon monolithic integrated circuit○This product is not designed protection against radioactive rays
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●Absolute Maximum Ratings
All middle size LCD equipments backlight of Notebook PC, portable DVD player, car navigation systems, etc.
Parameter Symbol Ratings Unit Condition
Datasheet
Terminal voltage 1 VMAX1 7 V
TEST, VREG, SENSP, SENSN, SW, RSTB,
PWMPOW, PWMDRV, FAILSEL, ISETH, ISETL
Terminal voltage 2 VMAX2 25 V LED1, LED2, LED3, LED4, LED5, LED6, VBAT
Terminal voltage 3 VMAX3 50.5 V VDET
Power dissipation 1 Pd1 1100 mW *1
Operating temperature range Topr -30 to +85
℃
Storage temperature range Tstg -55 to +150 ℃
*1 This value is the measurement value that was mounted on the PCB by ROHM.
Temperature deleting: 8.8mW/ ℃ from Ta>25℃
-
-
●Recommended Operating Rating (Ta=-30℃ to +85℃)
Parameter Symbol
Min. Typ. Max.
Limits
Unit Condition
Power supply voltage VBAT 2.7 12.0 22.0 V
●Electrical Characteristic
(Unless otherwise specified, VBAT=12V, RSTB=2.5V, Ta = +25
Parameter Symbol
Min. Typ. Max.
Limits
℃)
Unit Condition
[FAILSEL,PWMDRV Terminal]
EN threshold voltage (Low) VthL 0 - 0.2 V
EN threshold voltage (High) 1 VthH1 1.4 - 5.0 V VBAT>5.0V
EN threshold voltage (High) 2 VthH2 1.4 - VBAT V VBAT<5.0V
EN terminal input current Iin - 8.3 14.0 µA Input=2.5V
[PWMPOW Terminal]
Low Input Voltage range PWML 0 - 0.2 V
High Input Voltage range1 PWMH1 1.4 - 5.0 V VBAT>5.0V
High Input Voltage range2 PWMH2 1.4 - VBAT V VBAT<5.0V
PWM pull down resistor PWMR 300 500 700 k
[RSTB Terminal]
Low Input Voltage range RSTBL 0 - 0.2 V
High Input Voltage range1 RSTBH1 2.25 2.5 5.0 V VBAT>5.0V
High Input Voltage range2 RSTBH2 2.25 2.5 VBAT V VBAT<5.0V
Current Consumption IRSTB - 89 134 µA RSTB=2.5V, LED1-6=3V
[Regulator]
VREG Voltage VREG 4.0 5.0 6.0 V No load
Under Voltage Lock Out UVLO 2.05 2.25 2.65 V
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●Electrical Characteristic – continued
(Unless otherwise specified, VBAT=12V, RSTB=2.5V, Ta = +25 ℃)
Parameter Symbol
[Switching Regulator]
Quiescent Current 1 Iq1 - 0.6 3.4 µA RSTB=0V, VBAT=12V
Quiescent Current 2 Iq2 - 4.6 10 µA RSTB=0V, VBAT=22V
Current Consumption Idd - 3.4 5.1 mA VDET=0V,ISETH=24k
LED Control voltage VLED 0.4 0.5 0.6 V
Over Current Limit voltage Ocp 70 100 130 mV *1
SBD Open Protect Sop - - 0.1 V Detect voltage of VDET pin
Switching frequency fSW 0.8 1.0 1.2 MHz
Duty cycle limit Duty 92.5 95.0 99.0 % LED1-6=0.3V
Over voltage limit Ovl 43.0 44.7 46.4 V LED1-6=0.3V
[Current driver]
LED maximum current ILMAX - - 25 mA
Min. Typ. Max.
Limits
Unit Condition
Datasheet
LED current accuracy ILACCU - - ±3 % ILED=16mA
LED current matching ILMAT - - ±1.5 %
ISET voltage Iset 0.5 0.6 0.7 V
LED current limiter ILOCP 35 60 90 mA
LED Terminal Over Voltage Protect LEDOVP 10.0 11.5 13.0 V RSTB=PWMDRV=2.5V
*1 This parameter is tested with dc measurement.
Each LED current/Average (LED1- 6)
ILED=16mA
Current limit value at ISET
resistance 4.7k setting
LED1, 2, 3, 4, 5, 6=0.5V
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●Pin Descriptions
PIN
Name
In/Out
PIN
Number
Function
T erminal equivalent
A1 VDET In Detect input for SBD open and OVP C
A2 N.C. - No connect pin F
A3 SW Out Switching Tr drive terminal G
A4 SENSP In + Side Current sense terminal G
A5 SENSN In - Side Current sense terminal A
B1 N.C. - No connect pin F
B3 TEST In TEST input (Pull down 100k to GND) G
B4 ISETH In Resistor connection for ,LED current setting at PWMDRV=H A
B5 GND - GND B
C1 VBAT In Battery input C
C2 PWMPOW In PWM input pin for power ON/OFF E
C3 VREG Out Regulator output / Internal power-supply D
C4 ISETL In Resistor connection for ,LED current setting at PWMDRV=L A
C5 PWMDRV In PWM input pin for power ON/OFF only driver E
D1 RSTB In Reset pin L :Reset H :Reset cancel E
D2 GND - GND B
D3 FAILSEL In Latch selectable pin of protect function E
D4 GND - GND B
D5 LED1 In Current sink for LED1 C
E1 LED6 In Current sink for LED6 C
E2 LED5 In Current sink for LED5 C
E3 LED4 In Current sink for LED4 C
E4 LED3 In Current sink for LED3 C
E5 LED2 In Current sink for LED2 C
●Pin ESD Type
VBAT VREG
VBAT
PIN
PIN
PIN
GND
GND
A
VBAT
VBAT
B
C
PIN
GND
VBAT
D
VREG
PIN
GND
PIN
5.5V
Clamp
E
F
PIN
GND
G
Figure 2. Pin ESD Type
Datasheet
circuit diagram
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●Block Diagram
RSTB
PWMPOW
FAILSEL
SW
SE NSP
SENSN
TEST
PWM DRV
ISETH
IS E TL
Datasheet
VBAT VREG
300k
500 k
300 k
1M
10 0K
100k
300k
TSD
Q R
Current
Sense
REG
S
ISET H
Resi stor driver
ISET L
Resi stor driver
GND
GND
Intern al Power suplly
SBD Open protect
over voltage protect
C ontrol
sense
GND GN D
VIN detector
ERRAMP
PW M comp
+
+
OSC
LED TERMINA L
LED TERM IN AL
Over Voltage Protect
PWMDRV=H
PWMDRV=L
Detect
On
On
Pin number 23pin
Figure 3. Block Diagram
UVLO
+
-
VDET
+
-
-
-
-
-
-
-
+
LED 1
LED 2
LED 3
LED 4
LE D 5
LE D 6
+
-
Current Driver
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●Typical Performance Curves
Figure 4. Current Consumption vs VBAT
Figure 6. Oscillation frequency vs VBAT
25℃
85℃
-30℃
-30℃
85℃
25℃
25℃
-30℃
Figure 5. Quiescent current vs VBAT
2.3
2.28
2.26
VBAT [V]
2.24
2.22
2.2
-30 25 80
Ta [oC]
Figure 7. UVLO vs Temperature
Datasheet
85℃
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BD6581GU
●Typical Performance Curves - continued
Figure 8. Efficiency vs PWMPOW-HI Duty
6V 12V
ISETH=24k, PWM=200Hz
16V 16V
12V
6V
16V
100%
95%
90%
85%
80%
75%
Effici e n cy [ ％]
70%
65%
60%
0 102030405060708090100
Figure 9. Efficiency vs PWMDRV-HI Duty
I
Datasheet
6V
12V
Duty [%]
ETH=24k, PWM=200Hz
12V
6V
16V
Figure 10. LED current vs PWMDRV-HI Duty
PWM = 200Hz
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Figure 11. LED current vs PWMDRV-HI Duty
( Expansion) PWM = 200Hz
TSZ02201-0G3G0C400170-1-2
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●Typical Performance Curves - continued
LED Current [mA]
Figure 12. LED current vs PWMDRV-HI Duty
PWM = 200Hz, 1kHz,10kHz
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Figure 14. LED current vs PWMPOW-HI Duty
( Expansion) PWM = 200Hz
200Hz
6V
1kHz
10kHz
16V
12V
Duty (%)
20
18
16
14
12
10
8
LED cur r ent [mA]
6
4
2
0
0 102030405060708090100
Figure 13. LED current vs PWMPOW-HI Duty
Figure 15. LED current vs PWMPOW-HI Duty
PWM = 200Hz, 1kHz,10kHz
6V
16V
12V
Duty [%]
TPWM = 200Hz
Datasheet
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●Typical Performance Curves - continued
Figure 16. LED current matching vsPWMDRV-HI Duty
PWM = 200Hz
Figure 18. VOUT response
Driver Control PWM (PWMDRV)
Figure 17. LED current matching vs PWMDRV-HI Duty
(Expansion) PWM = 200Hz
Figure 19. LED current matching vs
Datasheet
PWMPOW-HI Duty
PWM = 200Hz
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●Typical Performance Curves - continued
16.30
16.25
16.20
16.15
16.10
16.05
16.00
15.95
15.90
LEDCurrent [mA]
15.85
15.80
15.75
15.70
Figure 20. LED current matching vs
PWMPOW-HI Duty
(Expansion) PWM = 200Hz
5V
7V
12V
2.7V
22V
-3 0 -1 0 10 30 50 70
temp [℃]
Figure 22. LED current vs Temperature
PWMDRV=H, ISETH=30k (16mA setting)
Figure 21. VOUT response
Power Control PWM (PWMPOW)
Figure 23. Line Transient (10V to 22V)
Datasheet
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(
BD6581GU
●Typical Performance Curves - continued
Datasheet
Figure 24. Line Transient (22V to 10V)
Figure 25. VOUT@OVP
LED OPEN)
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