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

10F

RTR020N05

m

Powe r

ON/OFF

200Hz

PWM

1F

4.7H

2 .2F *

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: 0.6A (Typ.)

Quiescent Current 2: 4.6A (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

03.Dec.2012 Rev.001

BD6581GU

●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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