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FD9802
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

Page 2
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.

Page 3
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

Page 4
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

Page 5
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.

Page 6
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

Page 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
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
Pull-down Resistor
RIN(pull down)
-
100
200
400
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

Page 8
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

Page 9
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

Page 10
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

Page 11
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.

Page 12
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

Page 13
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

Page 14
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

Page 15
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