FAN5611MPX_技术文档

November 2006

tm

FAN5611/FAN5612/FAN5613/FAN5614

Low-Dropout LED Drivers for White, Blue,

or any Color LED

Features

Description

■ LED drivers for parallel-connected LEDs (2 to 4)

The FAN5611/12/13/14 low-dropout product family is

designed to drive two to four parallel LEDs, providing

matched current source bias for all color LEDs. The LED

current is set by an external resistor, R_SET. The

FAN5611/13 supports four parallel LEDs with up to

160mA bias current (up to 40mA per output). The

FAN5612 supports three LEDs with up to 120mA bias

current (40mA per output). The FAN5614 drives two

high-current LEDs (80mA per output). Pin I1 should

always be connected to an LED to provide a matched

current for any additional LEDs.

■ Ultra-low voltage drop (< 300mV) to support direct

Li-ion applications

■ No EMI, no switching noise

■ No external components needed for current matching

■ Both analog and PWM brightness control

■ FAN5611, FAN5613 feature up to 160mA bias current

(up to 40mA for each LED)

■ FAN5612 features up to 120mA bias current

(up to 40mA for each LED)

■ FAN5614 features up to 160mA bias current

The FAN5612/13 and 14 are selected using an ENABLE

pin. When the chip is not selected (ENABLE pin is

LOW), the supply current drops to less than 1µA.

(up to 80mA for each LED)

■ Enable/Shutdown control (FAN5612, FAN5613,

FAN5614)

The FAN5611, FAN5612, and FAN5614 are available in

an SC-70 package. The FAN5611 and FAN5613 are

available in MLP packages.

■ Shutdown current < 1μA

■ Small footprint SC-70 and MLP

Applications

■ Cell Phones

■ PDA, DSC, MP3 Players

■ Handheld Computers

■ LCD Display Modules

■ Keyboard Backlight

■ LED Displays

Ordering Information

Product Number

FAN5611

Package Type

Order Code

6-Lead SC-70 / 2x2mm 6-Lead MLP

6-Lead SC-70

FAN5611S7X / FAN5611MPX

FAN5612S7X

FAN5612

FAN5613

2x2mm 8-Lead MLP

6-Lead SC-70

FAN5613MPX

FAN5614

FAN5614S7X

Table 1. Ordering Information

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FAN5611/FAN5612/FAN5613/FAN5614 Rev. 1.0.9

Typical Applications

V

IN

V

IN

V

IN

I

SET

I3

I2

I4

I3

I2

I1

I3

I2

I4

CTRL

I1

V

(3V)

I

SET

CONTROL

I

SET

V

(3V)

V

(3V)

CONTROL

R

SET

CTRL

FAN5612

FAN5611

GND

FAN5613

GND

R

SET

R

SET

ON/OFF

ENABLE

ON/OFF

ENABLE

GND

Four Diode Control With ON/OFF

Four Diode Control

Three Diode Control with ON/OFF

V

IN

I1/I2

I3/I4

I

SET

V

(3V)

CONTROL

CTRL

FAN5614

R

SET

ON/OFF

BLE

ENA

GND

Two Diode Control with ON/OFF

Figure 1. Typical Applications for FAN5611, FAN5612, FAN5613, FAN5614

Pin Assignments

I3

CTRL

I2

ON/OFF

I3

CTRL

I2

1

2

3

6

1

2

3

6

5

4

CTRL

I1/I2

N/C

1

2

3

6

5

4

ON/OFF

I3/I4

I4

5

4

GND

I1

GND

FAN5611

FAN5612

FAN5614

6-LEAD SC-70

TOP VIEW

GND

ON/OFF

NC

D2

D1

I3

I4

CTRL

I2

CTRL

D3

GND

D4

GND

I1

FAN5613

FAN5611

2x2mm 8-LEAD MLP

2x2mm 6-LEAD MPX

Figure 2. Pin Assignments for FAN5611, FAN5612, FAN5613, FAN5614

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FAN5611/FAN5612/FAN5613/FAN5614 Rev. 1.0.9

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Pin Descriptions

Name

FAN5611 FAN5612 FAN5613 FAN5614

Pin #

Description

Sets LED Current (see Operational Descripton)

Chip ON/OFF/Disable

1

CTRL

ON/OFF

I3

2

3

I2

Connect to Cathode of LED

I1/I2

I1

Connect to Cathode of LED

No Connection

I4

N/C

4

5

GND

I4

GND

I3

GND

Ground

Connect to Cathode of LED

I1

I3/I4

6

I3

ON/OFF

ON/OFF Chip ON/OFF/Disable

Connect to Cathode of LED

I2

7

8

CTRL

NC

Sets LED Current (see Operational Descripton)

No Connection

Table 2. Pin Descriptions

Notes:

1. The DAP of FAN 5611MPX can be tied to the GND pin or left floating. For better power dissipation, tie to GND.

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FAN5611/FAN5612/FAN5613/FAN5614 Rev. 1.0.9

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Absolute Maximum Ratings

The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The

device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are

not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table defines the condi-

tions for actual device operation.

Parameter

Min.

-0.3

Max.

6.0

Unit

V_I1, V_I2, V_I3, V_I4and ENABLE Voltage to GND

CTRL Voltage to GND

V

3.0

Power Dissipated by package at T_A= 85°C

6-Lead SC70

6, 8-Lead MLP

FAN5611/12/13

FAN5614

190

700

40

mW

mA

I1, I2, I3, I4 Steady State Current

I1/I2, I3/I4 Steady State Current

Lead Temperature (Soldering 10 seconds)

Junction Temperature

80

300

150

°C

kV

Storage Temperature

Electrostatic Discharge Protection (ESD) Level ⁽¹⁾

-55

4

HBM

CDM

1

Table 3. Absolute Maximum Ratings

Recommended Operating Conditions

Parameter

Min.

Typ.

Max.

Unit

LED Cathode Voltage

FAN5611, FAN5612, FAN5613

FAN5614

0.3

0.15

-40

0.5

1.0

V

Ambient Temperature

25

85

°C

Table 4. Recommended Operating Conditions

Notes:

2. Using Mil Std. 883E, method 3015.7 (Human Body Model) and EIA/JESD22C101-A (Charge Device Model).

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FAN5611/FAN5612/FAN5613/FAN5614 Rev. 1.0.9

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DC Electrical Characteristics

V

= 3.3V to 5.5V, ENABLE = V , T = 25°C unless otherwise noted.

IN

IN A

Parameter

Conditions

Min.

Typ.

Max.

Units

I_SET= 100µA

FAN5611/12/13

FAN5614

V_SAT= 300mV

Current Gain

140

200

260

I

_SET= 100µA

V_SAT= 150mV

V_SAT= 300mV

I_SET= 100µA

FAN5611/12/13

FAN5614

LED Current (Per Diode)

20

mA

%

V_SAT= 150mV

I_SET= 100µA

V_SAT= 300mV

FAN5611/12/13

FAN5614

I_SET= 100µA

T_A= -40°C to 85°C

LED to LED Current Matching

-3

3

V_SAT= 150mV

I_SET= 100µA

T_A= -40°C to 85°C

Peak Efficiency

V_IN= 3V

V_EN= 0V

90

%

Current in OFF Mode (I_SETand I_I)

1

µA

Minimum ENABLE “ON Voltage”⁽²⁾

(FAN5612, FAN5613, FAN5614)

Maximum ENABLE “OFF Voltage”⁽²⁾

(FAN5612, FAN5613 FAN5614)

I

_SET= 150µA

2.8

V

0.5

Table 5. DC Electrical Characteristics

Notes:

3. ENABLE “ON” is V_ENwhere I_I1>20mA @ V_I1=0.3V, while ENABLE “OFF” is V_ENwhere I_I1<1μA @ V_I1>0.3V.

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FAN5611/FAN5612/FAN5613/FAN5614 Rev. 1.0.9

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Typical Performance Characteristics

Figure 3. FAN5611/12/13

Figure 4. I_SETvs. V_CTRL

Output Current vs. Temerature

Figure 5. FAN5611/12/13

Figure 6. FAN5614

LED Current vs. LED Cathode Voltage

Figure 7. FAN5611/12/13

Figure 8. FAN5614 LED Current vs. Set Resistor

LED Current vs. Set Resistor

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FAN5611/FAN5612/FAN5613/FAN5614 Rev. 1.0.9

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Typical Performance Characteristics (Continued)

Figure 9. FAN5611/12/13/14

Figure 10. FAN5612/13/14

Control Voltage Transient Response

Enable Voltage Transient Response

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FAN5611/FAN5612/FAN5613/FAN5614 Rev. 1.0.9

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Application Information

Operational Descripton

V

The regulated current through each LED is a multiplica-

tion of the I_SETcurrent. The I_SETvalue is determined by

the R_SETvalue. The I_SETvalue can be calculated as:

IN

I_SET= I_LED/ Current Gain

I

SET

I3

I2

I4

CTRL

I1

V_CONTROL

Reference Figure 4, the I_SETvs. V_CTRLgraph, to esti-

mate V_CTRL. The value of R_SETis calculated according

to the formula:

R

FAN5613

SET

ON/OFF

ENABLE

R_SET= (V_CONTROL- V_CTRL) / I_SET

GND

For example, with V_CONTROL= 3V, a 10mA current limit

through the LED results in I_SET= 50µA. That translates

to an approximate value of 1.2V for V_CTRL, shown in Fig-

ure 4. The resulting R_SETvalue that maintains 10mA reg-

ulation is 36kΩ.

– V_DROP< 0.3V

– V_{F (at 20mA)}< 3.1V (Low V_F)

– V_{IN (at 20mA)}=V_DROP+ V_F= 3.4V

– V_{IN (at 5mA Typical)}~ 3.1V

The LED intensity can be adjusted by varying the duty

cycle of a square wave applied to the enable pin. Fre-

quency greater than 100Hz is best to avoid a "flickering"

effect. The maximum operation frequency is 10MHz.

where V_IN= Single cell Li-ion voltage.

Key advantages:

• No boost circuit is needed for the LCD or keyboard

backlight.

Efficiency Considerations

The FAN561X driver’s low-dropout architecture can sig-

nificantly improve the efficiency compared to using sim-

ple ballast resistors. The system efficiency, defined as

the ratio between the LEDs’ power and the input sup-

plied power, can be calculated as:

• Drivers are directly connected to a Li-ion battery.

• No EMI, no switching noise, no boost efficiency lost,

no capacitor, and no inductor.

Example 2: Drive high V_Fwhite or blue LEDs from

Efficiency = (V_IN– V_CATHODE) ⁄ V_IN

existing bus from 4.0V to 5.5V

High V_Fwhite or blue LEDs have forward voltage drop in

the range of 3.2V to 4.0V. Driving these LEDs with the

maximum current of 20mA for maximum brightness,

usually requires a boost circuit for a single cell Li-ion

voltage range. In some cases, there is already a voltage

bus in the system, which can be utilized. Due to the ultra-

low voltage drop of the FAN561X series of LED drivers to

drive high-V_Fwhite or blue LEDs, the V_INneeds to be

only 300mV higher than the highest V_Fin the circuit.

The lower the V_CATHODE, the higher the system effi-

ciency. Efficiency can be further improved by using a

higher V_INwith more LEDs, as shown in Example 3.

Application Notes

The ultra-low voltage drop across the FAN561X series of

LED drivers allows the devices to drive white, blue, and

other color LEDs in a wide range of input voltages. The

driver can be used in many applications. Although only

the FAN5613 is shown in all three examples, any of the

FAN561X-series LED drivers can be used in the applica-

tions presented, due to their similar operation.

– V_DROP< 0.3V

– V_{F (at 20mA)}< 3.3V to 4.0V (High V_F)

– V_{IN (at 20mA)}=V_DROP+ V_F= 3.6V to 4.3V

– V_{IN (at 5mA Typical)}~ 3.3V

Example 1: Drive low V_Fwhite or blue LEDs directly

where V_IN= existing bus = 3.3V to 4.3V.

from single cell Li-ion

When using white or blue low V_FLEDs, and utilizing the

drivers low voltage drop, only 3.4V in V_INis needed for

the full 20mA LED current. At 3.1V, there is 5mA typical

current available for the LEDs. The single cell Li-ion is

utilized in applications like cell phones or digital still cam-

eras. In most cases, the Li-ion battery voltage level only

goes down to 3.0V voltage level, not down to the full dis-

charge level (2.7V) before requesting the charger.

Key advantages:

• No boost circuit is needed for LCD or keyboard

backlight.

• Driver utilizes the existing bus.

• Ultra-low voltage drop provides the full 20mA LED

current at the lowest possible voltage level.

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FAN5611/FAN5612/FAN5613/FAN5614 Rev. 1.0.9

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Example 3: Drive white, blue, red, amber LEDs string

Assuming a boost circuit or existing voltage bus, the

FAN561X series of LED drivers can be used to drive a

whole string of LEDs with flexible brightness control via

analog and/or PWM. .

– V_DROP< 0.3V

– V_{IN_MIN}= N ¥ V_F+ V_DROP

– V_{IN _MAX}= N ¥ V_F+ 5.5V

where V_IN= existing bus, boost voltage.

V

Key advantage:

IN

• No need for current matching resistors and discrete

transistor for brightness control.

'N' number of

LEDs Per Branch

I

SET

I4

I3

I2

I1

V_CONTROL

CTRL

R

FAN5613

GND

SET

ENABLE

ON/OFF

LED Brightness Control

All of the FAN561X LED drivers feature analog and

PWM controls to give designers flexible brightness con-

trol. These control methods can be applied to the circuit

in two different ways to provide more flexibility than other

solutions. To determine the value of R_SET, use the I_SET

vs. V_CTRLgraph in Figure 4.

2. FAN5612

V

IN

I3

I2

I1

I

SET

V_CONTROL

CTRL

FAN5612

R

SET

1. FAN5611

ON/OFF

V

ENABLE

IN

GND

- Analog

I4

I3

I2

I1

I

SET

Set V_CONTROLand R_SETfor LED current using:

V_CONTROL(3V

)

CTRL

FAN5611

GND

- PWM - 1

R

SET

200 × (V_CONTROL– V_CTRL

)

I_LED= -------------------------------------------------------------------------

R_SET

V_CONTROL= PWM

- Analog

Set V_CONTROLand R_SETfor LED current using:

– Amplitude sets maximum LED current.

– Pulse width controls between 0 and maximum.

200 × (V_CONTROL– V_CTRL

)

- PWM - 2

I_LED= -------------------------------------------------------------------------

R_SET

Set V

and R

for maximum LED current using:

CONTROL

SET

- PWM

I_LED∼ 200 × I_SET

V_CONTROL= PWM

ON/OFF = PWM

– Amplitude sets maximum LED current.

– Pulse width controls between 0 and maximum.

– Amplitude has no effect on current.

– Pulse width controls between 0 and maximum.

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FAN5611/FAN5612/FAN5613/FAN5614 Rev. 1.0.9

9

3. FAN5613

4. FAN5614

V

IN

V

IN

I1/I2

I3/I4

I

SET

I3

FAN5613

I2

I4

CTRL

I1

V_CONTROL

CTRL

FAN5614

R

SET

ON/OFF

ENABLE

V

SS

ENABLE

V

SS

- Analog

Set V_CONTROLand R_SETfor LED current using:

- Analog

Set V_CONTROLand R_SETfor LED current using:

200 × (V_CONTROL– V_CTRL

)

I_LED= -------------------------------------------------------------------------

200 × (V_CONTROL– V_CTRL

)

R_SET

I_LED= -------------------------------------------------------------------------

R_SET

- PWM - 1

V_CONTROL= PWM

– Amplitude sets maximum LED current.

– Pulse width controls between 0 and maximum.

- PWM - 2

Set V

- PWM - 2

Set V

and R

for maximum LED current using:

CONTROL

SET

and R

for maximum LED current using:

CONTROL

SET

I_LED∼ 200 × I_SET

200 × (V_CONTROL– V_CTRL

)

I_LED= -------------------------------------------------------------------------

R_SET

ON/OFF = PWM

– Amplitude has no effect on current.

– Pulse width controls between 0 and maximum.

ON/OFF = PWM

– Amplitude has no effect on current.

– Pulse width controls between 0 and maximum.

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FAN5611/FAN5612/FAN5613/FAN5614 Rev. 1.0.9

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Mechanical Dimensions

2x2mm 6-Lead MLP

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FAN5611/FAN5612/FAN5613/FAN5614 Rev. 1.0.9

11

Mechanical Dimensions

2x2mm 8-Lead MLP

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FAN5611/FAN5612/FAN5613/FAN5614 Rev. 1.0.9

12

Mechanical Dimensions

6-Lead SC-70 Package

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FAN5611/FAN5612/FAN5613/FAN5614 Rev. 1.0.9

13

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FAN5611/FAN5612/FAN5613/FAN5614 Rev. 1.0.9

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型号：	FAN5611MPX
厂家：	FAIRCHILD SEMICONDUCTOR
描述：	Low-Dropout LED Drivers for White, Blue, or any Color LED 低压差LED驱动器为白色，蓝色，或任何颜色的LED 显示驱动器驱动程序和接口接口集成电路
文件：	总14页 (文件大小：698K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

FAN5611MPX [FAIRCHILD]

相关型号：

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FAN5611S7X_NL

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FAN5611_06

FAN5612

FAN5612S7X

FAN5612S7X_NL

FAN5612SX

FAN5612SX_NL

FAN5613

FAN5613MPX

FAN5614