BD6586MUV-E2 datasheet, PDF - EEWORLD Datasheet

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BD6586MUV-E2: DescriptionLED Lighting Drivers 24 LEDs 2.7-5.5V 24V Max Out 25mA Out; CategoryAnalog mixed-signal IC Drivers and interfaces; File Size611KB，24 Pages; ManufacturerROHM Semiconductor; Websitehttps://www.rohm.com/; Environmental Compliance

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BD6586MUV-E2 Overview

LED Lighting Drivers 24 LEDs 2.7-5.5V 24V Max Out 25mA Out

BD6586MUV-E2 Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Maker	ROHM Semiconductor
package instruction	,
Reach Compliance Code	compliant
ECCN code	EAR99
Factory Lead Time	10 weeks
Interface integrated circuit type	LED DISPLAY DRIVER
Peak Reflow Temperature (Celsius)	NOT SPECIFIED
Maximum time at peak reflow temperature	NOT SPECIFIED

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Datasheet

4-Channel White LED Driver

with Integrated FET for up to 24 LEDs

BD6586MUV

●General

Description

BD6586MUV is white LED driver IC with PWM step-up

DC/DC converter that can boost max 24V and current

driver that can drive max 25mA. The wide and

precision brightness can be controlled by external

PWM pulse.

BD6586MUV 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 accuracy & good matching (±3.0%) current

drivers 4ch (MAX.25mA/ch)

■

28V power Nch MOSFET

■

Soft Start

■

Drive up to 6 in series, 4 strings in parallel

■

Rich safety functions

▪

Over-voltage protection

▪

Output Short protection

▪

External SBD open detect

▪

Over current limit

▪

Thermal shutdown

▪

UVLO

●Key

Specifications



Operating power supply voltage range: 2.7V to 5.5V



LED maximum current:

25mA (Max.)



Quiescent Current:

0.1μA (Typ.)



Switching frequency:

1.0MHz(Typ.)



Operating temperature range:

-40℃ to +85℃

●Package

W(Typ.) x D(Typ.) x H(Max.)

VQFN024V4040

4.00mm x 4.00mm x 1.00mm

Figure 1.

●Typical

Application Circuit

●Applications

All middle size LCD equipments backlight of Notebook

PC, portable DVD player, car navigation systems, etc.

Battery

2.7V to 5.5V

4.7μF

4.7μH

2.2μF

1μF

6LED x 4Parallel

TRSW

100Hz~1kHz

PWM

VBAT

VDET

EN2

LED1

EN1

LED2

PWM

TESTO

TEST

PGND PGND GND

GND

ISET

LED3

LED4

Each 20mA

Can be set up to each 10~25mA

24kΩ

Figure 2. Typical Application Circuit

(Power control PWM application)

○Product

structure：Silicon monolithic integrated circuit

www.rohm.com

TSZ22111½14½001

○This

product is not designed protection against radioactive rays

1/20

TSZ02201-0G3G0C400190-1-2

10.Dec.2012 Rev.001

BD6586MUV

Datasheet

●Description

of Functions - continued

3) External SBD open detect and over voltage protection

BD6586MUV has over boost protection by external SBD open and over voltage protection. It detects VDET voltage and is

stopped output Tr in abnormal condition. Details are as shown below.

▪

External SBD open detect

In the case of external SBD is not connected to IC, the coil or internal Tr may be destructed. Therefore, at such an error

as VOUT becoming 0.1V or below, the Under Detector shown in the figure works, and turns off the output Tr, and

prevents the coil and the IC from being destructed.

And the IC changes from activation into non-activation, and current does not flow to the coil (0mA).

▪

Over voltage protection

At such an error of output open as the output DC/DC and the LED is not connected to IC, the DC/DC will boost too much

and the VDET terminal exceed the absolute maximum ratings, and may destruct the IC. Therefore, when VDET becomes

sensing voltage or higher, the over voltage limit works, and turns off the output Tr, and the pressure up made stop.

At this moment, the IC changes from activation into non-activation, and the output voltage goes down slowly. And,

when the output voltage becomes the hysteresis of the over voltage limit or below, the output voltage pressure up to

sensing voltage once again and unless the application error is recovered, this operation is repeated.

4) Thermal shut down

BD6586MUV has thermal shut down function.

The thermal shut down works at 175°C or higher, and while holding the setting of EN1, EN2 control from the outside,

turns into non operation condition from operation condition. And at 175°C or below, the IC gets back to its normal

operation.

5) Over Current Limit

Over current flows the current detection resistor between switching transistor source and PGND, then the voltage of that

resistor turns more than detection voltage. Over current protection is operating and it is prevented from flowing more than

detection current by reducing ON duty of switching Tr without stopping boost.

As over current detector of BD6586MUV is detected peak current, current more than over current setting value does not

flow.

6) Under Voltage Lock Out(UVLO)

When VBAT declines in 2.35V (Typ.) from the condition of the power-on, DC/DC and a current driver are changed from a

state of movement to the condition at the time of the non-movement. And, it is returned in a state of movement when

VBAT is raised beyond 2.55V (Typ.).

●Operating

of the Application Deficiency

1) When 1 LED or 1parallel OPEN during the operating the LED parallel which became OPEN isn't lighting, but other LED

parallel is lighting.

Then, Output boosts up to the over voltage protection voltage 25.5V because LED terminal can be 0V.

After the over voltage protection is detected, LED terminal of 0V isn’t cut from feedback loop.

Then, Output voltage will become normal voltage automatically.

2) When LED short-circuited in the plural

All LED continue to be turned on, unless LED terminal voltage become more than “LED terminal over voltage protection (11.5V)”.

When it was more than 11.5V, the line which short-circuited is only turned on, and LED current of other lines decrease or turn

off.

3) When Schottky diode came off

All LED aren't turned on.

Also, IC isn't destroyed because boost operating stops by the Schottky diode coming off protected function.

4) When an output capacitor short.

All LED aren't turned on.

And, an IC isn't destroyed because boost stops by the SBD open protection function.

But, big electric current occurs, and a coil or SBD is likely to destroy it because the route of the GND short circuit of the

power supply

→

coil

→

output capacitor occurs.

5) When the resistance to connect it to the ISET terminal short,

All LED aren't turned on.

Because LED current limit works, all current drivers stop, and DC/DC maintains boost under the state without load.

And, it is returned in a state of normality by canceling a state of short.

www.rohm.com

TSZ22111½15½001

5/20

TSZ02201-0G3G0C400190-1-2

10.Dec.2012 Rev.001

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