Page 1

FD9802

©Shanghai Fengxin Microelectronics Co., Ltd. Tel：86-21-37529331 Fax：86-21-37529332

Shenzhen Office Tel: 86-755-33075201 Fax: 86-755-83938491

Version: Apr., 2011 www.shfengxin.net

16 Bit Constant Current LED Driver

Product Description

FD9802 is a 16-bit constant current driver for LED displays. This product is designed by Shanghai

Fengxin Microelectronics Co., Ltd. The constant current can be set between 5mA to 90mA by an external

resistor.

FD9802C has the same function with MBI5026GF and FD9802D has the same function with

MBI5026GP. FD9802 can be directly used on the existing PCB, no need to design new PCB. FD9802’s

performance price ratio is higher; the manufacturers of LED display can save cost by using FD9802.

Model

FD9802C (Package SSOP24-1.0)

FD9802D (Package SSOP24-0.635)

FD9802C:SSOP24-300-1.0

FD9802D:SSOP24-150-0.635

Features

16 constant-current output channels

Constant output current invariant to load voltage change

Output current adjusted through an external resistor

Constant output current range: 5-90mA

Excellent output current accuracy:

Between channels：<±3%

Between ICs：<±4%

25MHZ clock frequency

Input compatible 5V CMOS

5V supply voltage

FD9802

©Shanghai Fengxin Microelectronics Co., Ltd. Tel：86-21-37529331 Fax：86-21-37529332

Shenzhen Office Tel: 86-755-33075201 Fax: 86-755-83938491

Version: Apr., 2011 www.shfengxin.net

“Bb-free & Green” Package

Compatible with TI’s TLC5926/7, TOSHIBA’s TB62726 and Macroblock’s MBI5026/4/0.

Pin Assignment

Pin Description

Pin Number Pin Name

Function

1

GND

Ground terminal.

2

SERIAL-IN Terminal of serial-data input to the shift register.

3

CLOCK

Clock input terminal for data shift on rising edge.

4

LATCH

Data strobe input terminal.

Serial data is transferred to the output latch when LATCH is

high. The data is latched when LATCH goes low.

5~20

OUT 0~15 Constant current output terminals.

21

ENABLE

Output enable terminal.

All the output terminals are turned off when ENABLE is high;

all the output terminals are turned on when ENABLE is low.

FD9802

©Shanghai Fengxin Microelectronics Co., Ltd. Tel：86-21-37529331 Fax：86-21-37529332

Shenzhen Office Tel: 86-755-33075201 Fax: 86-755-83938491

Version: Apr., 2011 www.shfengxin.net

22

SERIAL-OUT Serial-data output terminal, to the next SERIAL-IN.

23

R-EXT

Current setting terminal.

Connected with an external resistor to adjust output current.

24

VDD

Supply voltage terminal.

Block Diagram

Equivalent Circuit of Inputs and Outputs

FD9802

©Shanghai Fengxin Microelectronics Co., Ltd. Tel：86-21-37529331 Fax：86-21-37529332

Shenzhen Office Tel: 86-755-33075201 Fax: 86-755-83938491

Version: Apr., 2011 www.shfengxin.net

Timing Diagram

FD9802

©Shanghai Fengxin Microelectronics Co., Ltd. Tel：86-21-37529331 Fax：86-21-37529332

Shenzhen Office Tel: 86-755-33075201 Fax: 86-755-83938491

Version: Apr., 2011 www.shfengxin.net

Note: The latches circuit holds data when the LATCH terminal is Low. When the LATCH

terminal is at High level, latch circuit doesn’t hold the data, it passes from the input to the output.

When the ENABLE terminal is at Low level, output terminals OUT0 to OUT15 respond to the

data, either ON or OFF. When the ENABLE terminal is at High level, it switches off all the data

on the output terminal.

Truth Table

Note: OUT0 to OUT15 = ON when Dn = H; OUT0 to OUT15 = OFF when Dn = L.

FD9802

©Shanghai Fengxin Microelectronics Co., Ltd. Tel：86-21-37529331 Fax：86-21-37529332

Shenzhen Office Tel: 86-755-33075201 Fax: 86-755-83938491

Version: Apr., 2011 www.shfengxin.net

Maximum Rating

Parameter

Symbol

Value

Unit

Supply voltage

VDD

0~7.0

V

Input voltage

VIN

-0.4~VDD+0.4

V

Output voltage on OUTn

VOUT

-0.5~+17.0

V

Output current on OUTn

IOUT

+90

mA

Clock frequency

fCLK

25

MHz

GND terminal current

IGND

1440

mA

Power Dissipation

PD

1.00(ON PCB, Ta=25℃)

W

Thermal Resistance

Rth(j-a)

120(ON PCB)

℃/W

Storage temperature range

Tstg

-55~+150

℃

Operating temperature

range

Topr

-40~+85

℃

Recommended Operating Conditions

Parameter

Symbol

Test conditions

Min.

Typ.

Max.

Unit

Supply voltage

VDD

-

4.5

5.0

5.5

V

Input voltage

VIH

-

0.7VDD

-

VDD+0.3

V

VIL

-

-0.3

-

0.3VDD

Output voltage on OUTn

VOUT

-

-

-

15.0

V

Output current

IOUT

OUTn

5

-

45

mA

IOH

SERLAL-OUT

-

-3.7

-

IOL

SERLAL-OUT

-

-4.0

-

LATCH pulse width

Tw LAT

VDD=4.5~5V

100

-

-

ns

CLOCK pulse width

Tw CLK

50

-

-

ns

Setup time for DATA

Tsetup(D)

60

-

-

ns

Holdtime for DATA

Thold(D)

20

-

-

ns

Hold time for LATCH

Tsetup(L)

100

-

-

ns

Clock frequency

fCLK

Cascade Operation

-

15

20

MHz

Power Dissipation

PD

Ta=85 oC

-

-

0.5

W

FD9802

©Shanghai Fengxin Microelectronics Co., Ltd. Tel：86-21-37529331 Fax：86-21-37529332

Shenzhen Office Tel: 86-755-33075201 Fax: 86-755-83938491

Version: Apr., 2011 www.shfengxin.net

Electrical Characteristics

Parameter

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

High level input voltage

VIH

-

0.7VDD

-

VDD

V

Low level input voltage

VIL

-

GND

-

0.3VDD

Output leakage current IOH

VOH=9.5V

-

-

1.0

uA

Output Voltage (S-OUT)

VOL

IOL=1.0mA

-

-

0.4

V

VOH

IOH= -1.0mA

4.6

-

-

Output Current

(Between channels)

IOL1

VOUT=0.7±0.25V

REXT=910Ω

-

-

±3

%

IOL2

VOUT=0.7±0.25V

REXT=360Ω

-

-

±3

Output Current

(Between Ics)

IOL3

VOUT=0.7V

REXT=910Ω

-

-

±4

IOL4

VOUT=0.7V

REXT=360Ω

-

-

±4

Output Current vs. Output

Voltage Regulation

%/VDD

REXT=360Ω,

Ta=-40~85 oC

-

1.5

5.0

%/V

Pull-up Resistor

RIN(pull up)

-

150

300

600

kΩ

Pull-down Resistor

RIN(pull down)

-

100

200

400

kΩ

Supply Current (OFF)

IDD(off)1

REXT=OPEN,OUT0~7=off

-

0.3

0.6

mA

IDD(off)2

REXT=470Ω,OUT0~7=off

3.9

5.5

7.7

IDD(off)3

REXT=250Ω,OUT0~7=off

7.2

10.1

14.1

IDD(on)1

REXT=470Ω,OUT0~7=on

3.9

5.5

7.7

FD9802

©Shanghai Fengxin Microelectronics Co., Ltd. Tel：86-21-37529331 Fax：86-21-37529332

Shenzhen Office Tel: 86-755-33075201 Fax: 86-755-83938491

Version: Apr., 2011 www.shfengxin.net

Supply Current (ON)

IDD(on)2

REXT=250Ω,OUT0~7=on

7.2

10.1

14.1

Test Circuit for Electrical Characteristics

Switching Characteristics

Parameter

Symbol

Test

Condition

Min.

Typ.

Max.

Unit

propagation

delay time （“L” to

“H”）

tpLH

VDD=5.0V

VCE=0.4V

VIH= VDD

VIL=GND

REXT=470Ω

VL=3.0V

RL=1.0K

CL=10.5pF

-

120

150

ns

-

120

150

-

120

150

CLK-S-OUT

-

30

70

propagation

delay time （“H”

to “L”）

tpHL

-

70

100

ns

-

70

100

-

70

100

CLK-S-OUT

-

30

70

FD9802

©Shanghai Fengxin Microelectronics Co., Ltd. Tel：86-21-37529331 Fax：86-21-37529332

Shenzhen Office Tel: 86-755-33075201 Fax: 86-755-83938491

Version: Apr., 2011 www.shfengxin.net

Output current rise time

tor

-

100

200

ns

Output current fall time

tof

-

60

120

ns

Test Circuit for Switching Characteristics

Timing Waveform

1. CLOCK; OUTn ; SERIAL-IN; SERIAL-OUT

FD9802

©Shanghai Fengxin Microelectronics Co., Ltd. Tel：86-21-37529331 Fax：86-21-37529332

Shenzhen Office Tel: 86-755-33075201 Fax: 86-755-83938491

Version: Apr., 2011 www.shfengxin.net

2. CLOCK; SERIAL-IN; LATCH

3. ENABLE;OUTn

FD9802

©Shanghai Fengxin Microelectronics Co., Ltd. Tel：86-21-37529331 Fax：86-21-37529332

Shenzhen Office Tel: 86-755-33075201 Fax: 86-755-83938491

Version: Apr., 2011 www.shfengxin.net

Constant Current

In LED display application, FD9802 Provides nearly no variations in current from channel to

channel and from IC to IC. This can be achieved by:

1) The maximum current variation between channels is less than ±3%,and that between Ics is

less than ±4%.

2) The output current can be kept constant regardless of the variations of LED forward

voltages(Vf). This performs as a perfection of load regulation.

FD9802

©Shanghai Fengxin Microelectronics Co., Ltd. Tel：86-21-37529331 Fax：86-21-37529332

Shenzhen Office Tel: 86-755-33075201 Fax: 86-755-83938491

Version: Apr., 2011 www.shfengxin.net

Output Current Setting（IOUT-R-EXT ）

The output current is set by the external resistor RSET. The output current is:

Iout = (1.23/Rext)×15.3

Application circuitry

FD9802

©Shanghai Fengxin Microelectronics Co., Ltd. Tel：86-21-37529331 Fax：86-21-37529332

Shenzhen Office Tel: 86-755-33075201 Fax: 86-755-83938491

Version: Apr., 2011 www.shfengxin.net

Package Information

FD9802

©Shanghai Fengxin Microelectronics Co., Ltd. Tel：86-21-37529331 Fax：86-21-37529332

Shenzhen Office Tel: 86-755-33075201 Fax: 86-755-83938491

Version: Apr., 2011 www.shfengxin.net

Part Number

Package Type

FD9802C

SSOP24-300-1.00

FD9802D

SSOP24-150-0.635

FD9802C （SSOP24-300-1.00）

Unit: mm

FD9802

©Shanghai Fengxin Microelectronics Co., Ltd. Tel：86-21-37529331 Fax：86-21-37529332

Shenzhen Office Tel: 86-755-33075201 Fax: 86-755-83938491

Version: Apr., 2011 www.shfengxin.net

FD9802D （SSOP24-150-0.635）

Unit: mm