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AL8807Q

Document number: DS36904 Rev. 1 - 2

1 of 16

www.diodes.com

March 2014

L8807Q

HIGH EFFICIENCY LOW 30V 1.3A

AUTOMOTIVE GRADE BUCK LED DRIVER

Description

The AL8807Q is a step-down DC/DC converter designed to drive

LEDs with a constant current. The device can drive up to 9 LEDs,

depending on the forward voltage of the LEDs, in series from a

voltage source of 6V to 30V. Series connection of the LEDs provides

identical LED currents resulting in uniform brightness and eliminating

the need for ballast resistors. The AL8807Q switches at frequency up

to 1MHz with controlled rise and fall times to reduce EMI. This allows

the use of small size external components, hence minimizing the PCB

area needed.

Maximum output current of AL8807Q is set via an external resistor

connected between the V

and SET input pins. Dimming is achieved

by applying either a DC voltage or a PWM signal at the CTRL input

pin. An input voltage of 0.4V or lower at CTRL switches off the output

MOSFET simplifying PWM dimming.

The AL8807Q has been qualified to AEC-Q100 Grade 1 and is

Automotive Grade supporting PPAPs

Features

 LED driving current up to 1.3A

 Better than 5% accuracy

 High efficiency up to 96%

 Optimally controlled switching speeds

 Operating input voltage from 6V to 30V

 PWM/DC input for dimming control

 Built-in output open-circuit protection

 Automotive Grade with AEC-Q100 Qualification

 MSOP-8EP: Available in “Green” Molding Compound (No Br, Sb)

 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

 Halogen and Antimony Free. “Green” Device (Note 3)

 Automotive Grade

 Qualified to AEC-Q100 Standards for High Reliability

 PPAP Capable (Note 4)

Pin Assignments

Applications

 Automotive Interior LED Lamps

 Automotive Exterior LED Lamps

Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"

and Lead-free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

4. Automotive products are AEC-Q100 qualified and are PPAP capable. Automotive, AEC-Q100 and standard products are electrically and thermally the same,

except where specified. For more information, please refer to http://www.diodes.com/quality/product_compliance_definitions/.

Typical Applications Circuit

(Top View)

MSOP-8EP

SET

GND

CTRL

N/C

文档编号:DS36904 Rev. 1 - 2

1 / 16

2014年3月

高效率低30v 1.3a

汽车级降压led驱动器

AL8807Q是一款降压DC/DC转换器，用于驱动具有恒流的led。该设备可以

驱动多达9个led，取决于led的正向电压，从6V到30V的电压源串联。串联的

LED提供相同的LED电流，导致均匀的亮度和消除镇流器电阻的需要。AL880

7Q开关频率高达1MHz，可控制上升和下降时间，以减少EMI。这允许使用

小尺寸的外部元件，从而最大限度地减少所需的PCB面积。

AL8807Q的最大输出电流通过连接在 V

和set输入引脚之间的外部电阻设定

。调光通过在CTRL输入引脚处施加直流电压或PWM信号来实现。按CTRL键

时0.4V或更低的输入电压关闭输出MOSFET，简化PWM调光。

AL8807Q已通过AEC-Q100一级认证，是汽车级配套ppap

LED驱动电流高达1.3A

精度优于5%

效率高达96%

最佳控制切换速度

工作输入电压从6V到30V

PWM/DC输入调光控制

内置输出开路保护

通过AEC-Q100汽车等级认证

MSOP-8EP:可选“绿色”成型化合物(No Br, Sb)

完全无铅和完全符合RoHS标准(注1和2)

无卤素和锑。“环保”装置(注3)

符合AEC-Q100高可靠性标准

具备PPAP能力(注4)

销作业

汽车内饰LED灯

汽车外饰LED灯

1. 没有故意添加铅。完全符合欧盟指令2002/95/EC (RoHS)和2011/65/EU (RoHS 2)。

2. 有关Diodes Incorporated对无卤素和无锑的“绿色”定义的更多信息，请参阅http://www.diodes.com/quality/lead_free.html。

和无铅。

3.无卤素和无锑的“绿色”产品定义为含有<900ppm溴、<900ppm氯(<1500ppm总Br + Cl)和<1000ppm锑化合物的产品。4. 汽车产品通过AEC-Q100认证，具备PPAP能力。

汽车，AEC-Q100和标准产品在电和热方面是相同的，除非另有规定。欲了解更多信息，请访问http://www.diodes.com/quality/product_compliance_definitions/。

典型应用电路

(前视图)

设置

GND

CTRL

西

北

偏

南

翻译仅供参考，如需更准确的信息，请参考英文版

AL8807Q

Document number: DS36904 Rev. 1 - 2

2 of 16

www.diodes.com

March 2014

L8807Q

Pin Descriptions

Pin Name Pin Number Functions

SET 1 Set Nominal Output Current Pin. Configure the output current of the device.

GND 2, 3 GND Pin

CTRL 4

Dimming and On/Off Control Input.

 Leave floating for normal operation.

CTRL

= V

REF

= 2.5V giving nominal average output current I

OUTnom

= 0.1/R

)

 Drive to voltage below 0.4V to turn off output current

 Drive with DC voltage (0.5V < V

CTRL

< 2.5V) to adjust output current from 20% to 100% of I

OUTnom

 A PWM signal (low level ≤ 0.4V and high level > 2.6; transition times less than 1us) allows the output

current to be adjusted below the level set by the resistor connected to SET input pin.

SW 5, 6 Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to reduce EMI.

N/C 7 no connection

Input Supply Pin. Must be locally decoupled to GND with >

2.2µF X7R ceramic capacitor – see applications

section for more information.

EP EP

Exposed pad/TAB connect to GND and thermal mass for enhanced thermal impedance. Should not be used as

electrical ground conduction path.

Functional Block Diagram

Absolute Maximum Ratings

(@T

= +25°C, unless otherwise specified.)

Symbol Parameter Ratings Unit

ESD HBM Human Body Model ESD Protection 4000 V

ESD MM Machine Model ESD Protection 300 V

ESD CDM Charged Device Model ESD Protection 1000 V

Continuous V

pin voltage relative to GND

-0.3 to +40 V

SW voltage relative to GND -0.3 to +40 V

CTRL

CTRL pin input voltage -0.3 to +6 V

SW-RMS

DC or RMS Switch current 1.6 A

SW-PK

Peak Switch current (<10%) 2.5 A

Junction Temperature +150 °C

LEAD

Lead Temperature Soldering +300 °C

Storage Temperature Range -65 to +150 °C

Caution: Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings only;

functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be

affected by exposure to absolute maximum rating conditions for extended periods of time.

Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling

and transporting these devices.

文档编号:DS36904 Rev. 1 - 2

2 / 16

2014年3月

销的描述

销的名字密码

设置标称输出电流引脚。配置设备的输出电流。

接地销

调光和开/关控制输入。

保持浮动状态以保证正常运行。

CTRL

REF

= 2.5V给出标称平均输出电流 I

OUTnom

=0.1/R

)

驱动到电压低于0.4V关闭输出电流

直流电压(0.5V < V

CTRL

< 2.5V)驱动，输出电流从 I

OUTnom

的20%调节到100%

PWM信号(低电平≤0.4V，高电平> 2.6;转换时间小于1us)允许将输出电流调整到低于连接到set输入引脚的电

阻设定的电平。

开关销。在这里连接电感/自由转动二极管，尽量减少这个引脚的轨道长度，以减少电磁干扰。

N / C 7 没有关系

输入电源引脚。必须与> 2.2µF X7R陶瓷电容器局部解耦到地-请参阅应用部分了解更多信息。

EP EP

暴露的pad/TAB连接到GND和热质量，以增强热阻抗。不宜用作接地电导通路。

功能框图

绝对最大收视率(@

除非另有说明，否则TA = +25°C。)

符号参数

ESD HBM 人体模型静电防护

ESD毫米机器型号ESD保护

防静电清洁发展机制充电设备型号ESD保护

相对于地的连续 V

引脚电压

-0.3到+40

相对GND的SW电压 -0.3到+40

CTRL引脚输入电压 -0.3到+6

DC或RMS开关电流

峰值开关电流(<10%)

结温

铅温焊

储存温度范围 -65到+150

大于上述“绝对最大额定值”的应力可能会对设备造成永久性损坏。这些只是压力评级;不暗示设备在这些或任何其他超出本规范中所指示的条件下的功能操作。长时

间暴露在绝对最大额定值条件下，可能会影响器件的可靠性。半导体器件是ESD敏感器件，暴露在ESD事件中可能会损坏器件。在搬运和运输这些设备时，应采取适

当的防静电措施。

AL8807Q

Document number: DS36904 Rev. 1 - 2

3 of 16

www.diodes.com

March 2014

L8807Q

Recommended Operating Conditions (@T

= +25°C, unless otherwise specified.)

Symbol Parameter Min Max Unit

Operating Input Voltage relative to GND 6.0 30 V

CTRLH

Voltage High for PWM dimming relative to GND 2.6 5.5 V

CTRLDC

Voltage range for 20% to 100% DC dimming relative to GND 0.5 2.5 V

CTRLL

Voltage Low for PWM dimming relative to GND 0 0.4 V

Maximum switching frequency — 1 MHz

Continuous switch current — 1.3 A

Junction Temperature Range -40 125 °C

Electrical Characteristics (@ V

= 12V, T

= +25°C, unless otherwise specified.)

Symbol Parameter Conditions Min Typ Max Unit

INSU

Internal regulator start up threshold

rising

— — 5.9 V

INSH

Internal regulator hysteresis threshold

falling

100 — 300 mV

Quiescent current Output not switching (Note 5) — — 350 µA

Input supply Current CTRL pin floating f = 250kHz — 1.8 5 mA

Set current Threshold Voltage — 95 100 105 mV

TH-H

Set threshold hysteresis — — ±20 — mV

SET

SET pin input current

SET

= V

-0.1

— 16 22 µA

CTRL

CTRL pin input resistance Referred to internal reference — 50 — kΩ

REF

Internal Reference Voltage — — 2.5 — V

DS(on)

On Resistance of SW MOSFET

= 1A

— 0.25 0.4 Ω

SW rise time

SENSE

= 100±20mV, f

= 250kHz

= 0.1V~12V~0.1V C

= 15pF

— 12 — ns

SW fall time — 20 — ns

SW_Leakage

Switch leakage current

=30V

— — 0.5 μA



Thermal Resistance Junction-to-

Ambient (Note 6)

(Note 7) — 69 — C/W



Thermal Resistance Junction-to-case

(Note 8)

(Note 7) — 4.3 — —

Notes: 5. AL8807Q does not have a low power standby mode but current consumption is reduced when output switch is inhibited: V

SENSE

= 0V. Parameter is

tested with V

CTRL

≤ 2.5V

6. Refer to figure 35 for the device derating curve.

7. Test condition for MSOP-8EP: Device mounted on FR-4 PCB (51mm x 51mm 2oz copper, minimum recommended pad layout on top layer and

thermal vias to bottom layer with maximum area ground plane. For better thermal performance, larger copper pad for heat-sink is needed

8. Dominant conduction path via exposed pad.

文档编号:DS36904 Rev. 1 - 2

3 / 16

2014年3月

推荐运行条件(@T

A = +25°C，除非另有说明。)

相对于地的输入电压

相对于GND, PWM调光的电压高

电压范围为20%至100%直流调光相对于地

相对于GND, PWM调光电压低

最大开关频率

连续开关电流

结温范围

电气特性(@ V

IN = 12V, TA = +25℃，除非另有说明。)

符号参数

内部调节器启动阈值

内部调节器迟滞阈值

静态电流输出不切换(注5)

输入电源 CTRL引脚浮动f = 250kHz

设置电流阈值电压

设置阈值迟滞

SET引脚输入电流

CTRL引脚输入电阻参考内部参考

内部基准电压

SW MOSFET的电阻研究

西南上升时间

SENSE

= 100±20mV， f

= 250kHz

= 0.1V~12V~0.1V C

= 15pF

西南降时

开关漏电流

热阻连接-环境(注6)

(注7)

热阻接线盒(注8)

(注7)

5. AL8807Q没有低功耗待机模式，但当输出开关被抑制时，电流消耗降低: V

SENSE

= 0V。参数测试用 V

CTRL

≤2.5V 6。设备降额曲线见图35。7. MSOP-8EP的测试

条件:器件安装在FR-4 PCB (51mm x 51mm 2oz铜)上，建议在顶层配置最小的焊盘布局，并在底层通过热通孔，最大面积地平面。为了获得更好的散热性能，

需要更大的铜衬垫作为散热片。主要的传导路径通过暴露的衬垫。

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