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June 2013

FAN5340

PWM亮度控制并可断开负载的同步恒流升压串联LED驱动器

产品特性

说明

FAN5340 为同步恒流LED驱动器，可以向最多4个串联的LED

提供最高可达500mW的功率。优化设计更适用于小型装置，

1.2MHz的固定开关频率从而允许使用较小的芯片电感和电

容。

. 同步电流模式升压变换器

. 输出功率可达500mW

. 支持2, 3, 或 4 个 LED 串联

. 输入电压范围：2.7V－4.8V

. 1.2MHz 固定开关频率

. 1mA 最大静态电流

安全方面，器件整合了短路检测、过压和热关断保护功能。此

外，若电池电压过低将触发输入欠压闭锁保护。

亮度（调光）控制通过在EN引脚上施加 300Hz 至 1kHz 的

PWM 信号来实现。关断期间，FAN5340 将 LED节点从保持

升压稳压器电压C_OUT的升压稳压器输出端上断开，从而减少

PWM调光的音频噪声，并断开 LED 串的电源。

. 软启动

. 输入欠压锁定(UVLO)

. 输出过压保护 (OVP)

. 短路检测

GND

EN

VIN

1

2

3

4

8

7

6

5

C_IN

. 热关闭保护（）TSD

. 8-引脚, 3.00 x 3.00mm UMLP

. 8-引脚 (焊球), 1.57 x 1.57mm WLCSP

C_OUT

VOUT

SW

2 – 4

LEDs

L

P1

GND

1

VLED

FB

PGND

RSET

适用范围

. 手机，智能电话

Figure 1.

典型应用

. 便携式电脑

. WLAN DC-DC 变换器模块

. PDA、DSC、PMP 以及 MP3 播放器

订购信息

器件型号

FAN5340UCX

工作温度范围

封装

包装

卷带

8 球型，1.57 x 1.57mm 晶圆级芯片封装

（WLCSP）

-40 至 +85°C

FAN5340MPX (初级)

8-管脚，3.00 x 3.00mm 超薄模塑无铅封装(MLP)

www.fairchildsemi.com

FAN5340 • Rev. 1.0.1

框图

L1

SW

VIN

CIN

Q1

Q2

D1

GATE

DRIVE

VOUT

VLED

PGND

C_OUT

Q3

BOOST

CONTROL

2 – 4

LEDs

EN

GND

FB

15 -

RSET

133

Figure 2.

框图

Table 1. 建议使用的外部器件

组件

说明

厂商

参数

L⁽¹⁾

最小值典型值最大值单位

22

H

Murata

LQH3NPN220MGOK

L1

22H 标称

DCR (系列 R)

1100

4.7

m

F

C_OUT

C_IN

4.7F X5R 或更好

C

4.7

F

说明:

1. 最小 L (电感) 涉及容限、温度和直流偏压的影响(L随电流升高而降低)。

www.fairchildsemi.com

FAN5340 • Rev. 1.0.1

2

引脚布局

GND

A1

EN

A2

VLED

A3

B3

C3

A2

C2

A1

B1

C1

B1

C1

B3

C3

VIN

FB

C2

VOUT SW PGND

Figure 3.

WLCSP 封装，顶视图

Figure 4.

WLCSP 封装，底视图

GND

EN

1

2

3

4

8 VIN

7 VOUT

6 SW

P1

GND

VLED

FB

5 PGND

Figure 5.

8-引脚, 3 x 3mm 顶视图MLP,

引脚说明

引脚号

名称

说明

CSP

MLP

A1

1

2

3

4

GND

EN

模拟地。所有信号均以该引脚为参照。

启用 / PWM亮度控制。该引脚上的逻辑低电平可关断芯片，将LED与 VOUT断开，并降低芯

片的功耗。该管脚上存在一只内部 300kΩ的下拉电阻。

A2

A3

B3

VLED

FB

LED串输出。连接至两个至四个LED组成的串节点。

电流反馈。升压稳压器可将该引脚的电压调至0.5V，以控制LED的串行电流。将该引脚连接

GND和LED串阴极之间的电流设置电阻（R_SET）。

C3

C2

C1

B1

5

6

7

8

PGND

SW

电源地。升压开关和栅极驱动在此引脚接地。

开关节点。电感L1连接在V_IN和该引脚之间。

升压输出电压。升压稳压器的输出。

输入电压。

VOUT

VIN

www.fairchildsemi.com

FAN5340 • Rev. 1.0.1

3

绝对最大额定值

如果应力超过绝对最大额定值，器件就会毁损。在推荐的工作条件之上，该器件可能无法正常运行或操作，且不建议让器件在这

些条件下长期工作。此外，过度暴露在高于推荐的工作条件下，会影响器件的可靠性。绝对最大额定值仅是额定应力值。

符号

参数

最小值最大值

单位

V

V_IN

VIN

–0.3

6.0

V_IN+ 0.3

24.0

V

_FB、V_ENFB、EN引脚

V

V_SW

SW 引脚

V

V_OUT

VOUT 引脚

24.0

V

人体模型满足JESD22-A114

4.0

1.5

ESD

静电放电防护等级

kV

充电器件模型满足JESD22-C101

T_J

T_STG

T_L

结温

–40

–65

+150

+260

°C

存储温度

引线焊接温度，10秒

推荐工作条件

推荐的操作条件表定义了真实器件的工作条件。指定推荐的工作条件，以确保设备的最佳性能达到数据表中的规格。飞兆半导体

建议不要超过推荐工作条件，也不能按照绝对最大额定值进行设计。

符号

V_IN

参数

最小值

2.7

典型值

最大值

4.8

单位

V

VIN 电源电压

VOUT 电压

V_OUT

I_OUT

6.2

16.0

40

V

VOUT 负载电流

5

mA

Hz

°C

f_{EN_PWM}EN 引脚 PWM 调光频率

100

–40

300

1000

+85

T_A

T_J

环境温度

结温

+125

热性能

结-环境之间热阻与具体应用和电路板布局有关。该数据由2s2p四层板测得，符合JESD51-JEDEC标准。特别注意的是，不要超

过给定环境温度T_A时的结温 T_J(max)

。

符号

参数

典型值

110

单位

°C/W

WLCSP 封装

MLP 封装

结-环境之间热阻

_JA

49

www.fairchildsemi.com

FAN5340 • Rev. 1.0.1

4

电气规格

V_IN= 2.7V 至 4.8V, T_A= -40°C至 +85°C，除非另有说明。典型值测量条件为 T_A= 25°C 且 V_IN= 3.6V。

参数

工作条件

最小值典型值最大值单位

符号

电源

I_Q

静态电流

EN = V_IN, 器件未开关

1

mA

A

V

I_SD

停机电源电流

EN = GND, V_IN= 3.6V

0.3

2.40

2.15

250

1.0

V

_IN升

_IN降

2.30

2.00

2.50

2.25

V_UVLO

欠压锁定

V

V_UVHYST欠压锁定滞环宽度

EN:启用引脚

mV

V_IH

V_IL

输入电压高电平

输入电压低电平

EN 下拉电阻

1.2

V

0.4

400

80

R_EN

200

20

300

k

ms

t_SD

EN 低电平，关断延迟

自 EN 的下降沿

反馈和参考

V_FB

反馈电压

480

500

0.1

520

1.0

mV

I_FB

反馈输入电流

V_FB= 500mV

A

电源输出

V_IN= 3.6V, V_OUT= 10V, I_SW= 100mA

V_IN= 2.7V, V_OUT= 10V, I_SW= 100mA

V_OUT= 10V, I_SW= 100mA

600

850

2.0

2.8

R_{DS(ON)_Q1}升压开关接通电阻

m

R_{DS(ON)_Q2}同步整流导通电阻

R_{DS(ON)_Q3}负载开关导通电阻



V_OUT= 10V, I_LED= 10mA

EN = 0, V_IN= V_SW= V_OUT= 5.5V,

V_LED= 0

I_SW(OFF)SW 节点漏电流⁽²⁾

0.1

1.0

A

I_LIM-PK

振荡器

f_SW

升压开关峰值电流限值

升压稳压器开关频率

PWM 占空比⁽³⁾

V_IN= 3.6V

325

1.0

400

475

mA

1.2

1.4

100

20.0

MHz

%

PWM 调光

D_PWM

PWM调光频率≤1kHz

1.0

输出和保护

V_OVP

升压输出过压保护 (OVP)

18.0

19.0

0.8

V

V_OVPHYSTOVP 滞环

V

_OUT降

_OUT升

V_IN– 1.5

V_IN– 1.3

V

V_THSC

V_LED短路检测阈值

V

D_MAX

D_MIN

T_SD

最大升压占空比⁽³⁾

最小升压占空比⁽³⁾

热关闭

85

%

°C

20

150

25

T_HYS

热关闭滞环宽度

说明:

2. SW 漏电流包括三个内部开关的漏电流； SW 至 GND, V_OUT至 V_LED, 以及 SW 至 V_OUT

3. 设计保证。

.

www.fairchildsemi.com

FAN5340 • Rev. 1.0.1

5

典型特性

V_IN= 3.6V, T_A= 25C, I_LED= 20mA, L = 22µH, C_OUT= 4.7µF.

Figure 6.

效率 vs. LED 电流：2 LED

Figure 7.

效率 vs. LED 电流：3 LED

Figure 8.

效率 vs. LED 电流：4 LED

Figure 9.

f_SWvs.输入电压 vs.温度

Figure 10. FB 电压 vs.输入电压 vs.温度

Figure 11. OVP vs.输入电压vs.温度

FAN5340 • Rev. 1.0.1

www.fairchildsemi.com

6

典型特性(续)

Figure 12. PWM 线性化，超过调光占空比全程，4

Figure 13. PWM 线性化，调光占空比<2.5%，4 LED

LED

Figure 14.

V_OUT上的最大输出电流

Figure 15. 电源瞬态，步进10µs 4 LED

Figure 16. 过压保护：软起动，打开LED串

FAN5340 • Rev. 1.0.1

www.fairchildsemi.com

7

典型特性(续)

Figure 17. 1ms/Div，100%占空比的冷启动波形

Figure 18. 100%占空比的冷启动波形以10ms/Div显示

启动、关断再启动。

Figure 19. FAN5340 I_LOAD从 20mA 步进至 30mA，

通过在10mA 启用 FAN5640 3 LED

Figure 20. FAN5340 I_LOAD从 30mA 步进至 20mA，

通过在10mA 禁用 FAN5640 3 LED

FAN5340 • Rev. 1.0.1

www.fairchildsemi.com

8

电路说明

概述

过压保护

FAN5340 是一款电感电流模式升压的串联 LED 驱动器，通

过保持R_SET电阻 0.5V 的电压实现LED电流的调节。LED 串的

电流（I_LED）的计算公式为：

若 LED 串采用开路，FB 保持为 0V，且输出电压在没有过压

保护（OVP）电路的情况下持续升高。当 V_OUT超过19.0V

时，FAN5340 的 OVP电路将禁用升压稳压器，并持续到V_OUT

降至18.2V以下方可启用。

0.5

I_LED



(1)

R_SET

热关闭

晶圆温度超过150°C时，发生复位并保持，直至晶圆冷却至

125°C；此时允许电路开始软起动序列。

LED上的正向电压可决定 V_OUT，FAN5340 的升压稳压器输出

也可以支持V_OUT(参见图 21) 上的其他负载，前提是不超过输

入电流限制。

适用范围

使用 VOUT 驱动附加的 LED 串

VOUT 引脚可用作简单电流源（如图22使用FAN5640所示）

或分离电流槽。为避免 EN 引脚在低电平时下拉 V_OUT，应启

用辅助串，除非 EN 引脚处于高电平。因而辅助串可使用与

EN 相同线路进行 PWM 调光，如图所示，或单独启用，但应

在 FAN5340 的导通期间。

IOUT1

GND

IOUT2

VIN

1

2

3

6

5

4

FAN5640

R1

RSET

EN

GND

VIN

1

8

C_IN

Figure 21. 最大输出电流 vs. 输入电压

C_OUT

EN

VLED

FB

VOUT

SW

2

3

4

7

6

5

FAN5340

UVLO 和软启动

PGND

若 EN 低电平超过 20ms，芯片在EN 升高时将进行“冷启动”的

软起动周期，前提是 V_IN超过 UVLO 阈值。软起动电路将参考

电压输入误差放大器，从而控制冲击电流。

R2

Figure 22. 驱动附加的 LED 串

若使用 VOUT 驱动附加负载，应注意不要超过输入电流限

PWM 调光

EN 低电平时，芯片关断一个 MOSFET (Q3 图2), 其断开

LED 负载，防止EN引脚低电平时 C_OUT放电。只要 EN 低电

平的时间不超过 20ms，稳压器的主回路将在 EN 恢复高电平

时迅速恢复控制。

制。图21 给出了典型芯片的限制。总负载(I_OUT1 + I_OUT2 + I_LED

)

应保持低于图21值的 70%。

短路检测

V_OUT降至 V_IN– 1.5V 以下时，Q3 关断直至 V_OUT至少恢复至

V_IN– 1.3V 方可导通。

www.fairchildsemi.com

FAN5340 • Rev. 1.0.1

9

物理尺寸

BALL A1

INDEX AREA

(Ø0.25)

Cu PAD

2X

(Ø0.35)

SOLDER MASK

OPENING

D

2X

RECOMMENDED LAND PATTERN (NSMD)

TOP VIEW

E

D

SIDE VIEWS

NOTES:

A. NO JEDEC REGISTRATION APPLIES.

B. DIMENSIONS ARE IN MILLIMETERS.

(X)+/-.018

C, DIMENSIONS AND TOLERANCES PER

ASME Y14.5M, 1994

8 X Ø0.315 +/- .025

D. DATUM C, THE SEATING PLANE, IS DEFINED

BY THE SPHERICAL CROWNS OF THE BALLS.

C

(Y)+/-.018

B

A

E. PACKAGE TYPICAL HEIGHT IS 582 MICRONS

± 43 MICRONS (539-625 MICRONS).

1

2

3

F. FOR DIMENSIONS D, E, X, AND Y SEE

PRODUCT DATASHEET.

BOTTOM VIEW

G. BALL COMPOSITION: Sn95.5-Ag3.9-Cu0.6

I. DRAWING FILENAME: MKT-UC008ABrev2.

产品规格尺寸

D

E

X

Y

产品

FAN5340UC

1.570

0.285

Figure 23. 8 球型，1.57 x 1.57mm 晶圆级芯片封装（WLCSP）

封装图纸是作为一项服务，提供给考虑飞兆半导体产品的客户。具体参数可进行改动，且无需做出相应通知。请注意图纸上的版本和/或日期，

并联系飞兆半导体代表核实或获得最新版本。封装规格并不超出飞兆公司全球范围内的条款与条件，尤其指保修，保修涉及飞兆半导体的全部产

品。

随时访问飞兆半导体在线封装网页，可以获得最新的封装图:

http://www.fairchildsemi.com/packaging/。

www.fairchildsemi.com

FAN5340 • Rev. 1.0.1

10

物理尺寸(续)

2X

0.8 MAX

2X

RECOMMENDED LAND PATTERN

0.05

0.00

SEATING

PLANE

A. CONFORMS TO JEDEC REGISTRATION MO-229,

VARIATION VEEC, DATED 11/2001

B. DIMENSIONS ARE IN MILLIMETERS.

C. DIMENSIONS AND TOLERANCES PER

ASME Y14.5M, 1994

D. FILENAME: MKT-MLP08Drev2

Figure 24. 8-管脚，3 x 3mm 超薄模塑无铅封装(MLP)

封装图纸是作为一项服务，提供给考虑飞兆半导体产品的客户。具体参数可进行改动，且无需做出相应通知。请注意图纸上的版本和/或日期，

并联系飞兆半导体代表核实或获得最新版本。封装规格并不超出飞兆公司全球范围内的条款与条件，尤其指保修，保修涉及飞兆半导体的全部产

品。

随时访问飞兆半导体在线封装网页，可以获得最新的封装图:

http://www.fairchildsemi.com/packaging/。

www.fairchildsemi.com

FAN5340 • Rev. 1.0.1

11

www.fairchildsemi.com

FAN5340 • Rev. 1.0.1

12

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1


型号：	FAN5340UCX
厂家：	ONSEMI
描述：	LED 驱动器，同步升压，带 PWM 调光接口驱动驱动器
文件：	总14页 (文件大小：1812K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

FAN5340UCX [ONSEMI]

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