ETC MBI5016CF

MBI5025
Advance Information
Macroblock
16-bit Constant Current LED Sink Driver
Features
MBI5025CN/CNS
MBI5016CNS
• 16 constant-current output channels
• Constant output current invariant to load voltage change：
Constant output current range: 3-50 mA
• Excellent output current accuracy:
between channels: ±3% (max.), and
between ICs: ±6% (max.)
CN: P-DIP24-300-2.54
CNS: SDIP24-300-1.78
MBI5016CF
MBI5025CD/CF
• Output current adjusted through an external resistor
• Fast response of output current, OE (min.): 400 ns
• 25MHz clock frequency
• Schmitt trigger input
• 3.3V / 5V supply voltage
CD: SOP24-300-1.27
CF: SOP24-300-1.00
MBI5016CP
MBI5025CP
SSOP24-P-150-0.64
Current Accuracy
Between Channels
Between ICs
< ±3%
< ±6%
Conditions
IOUT = 3 mA ~ 35 mA
Product Description
MBI5025 is designed for LED displays. As an enhancement of its predecessor, MBI5016,
MBI5025 exploits PrecisionDrive™ technology to enhance its output characteristics. MBI5025
contains a serial buffer and data latches which convert serial input data into parallel output
format. At MBI5025 output stage, sixteen regulated current ports are designed to provide
uniform and constant current sinks for driving LEDs within a large range of Vf variations.
MBI5025 provides users with great flexibility and device performance while using MBI5025 in
their system design for LED display applications, e.g. LED panels. Users may adjust the output
current from 3 mA to 35 mA through an external resistor, R ext, which gives users flexibility in
controlling the light intensity of LEDs. MBI5025 guarantees to endure maximum 17V at the
output port. The high clock frequency, 25 MHz, also satisfies the system requirements of high
volume data transmission.
Macroblock, Inc. 2003
Floor 6-4, No.18, Pu-Ting Rd., Hsinchu, Taiwan 30077, ROC.
TEL: +886-3-579-0068, FAX: +886-3-579-7534 E-mail: [email protected]
-1-
MBI5025
16-bit Constant Current LED Sink Driver
Block Diagram
OUT0
OUT1
OUT14 OUT15
IO Regulator
R-EXT
VDD
16-bit Output Driver
OE
16
16-bit Output Latch
LE
16
GND
16-bit Shift Register
SDI
SDO
CLK
Terminal Description
Pin Configuration
Pin No.
Pin Name
Function
1
GND
Ground terminal for control logic and current
sink
2
SDI
Serial-data input to the shift register
3
CLK
Clock input terminal for data shift on rising
edge
Data strobe input terminal
4
5~20
LE
Serial data is transferred to the output latch
when LE is high. The data is latched when
LE goes low.
GND 1
SDI
2
CLK 3
LE
4
OUT0 5
OUT1 6
OUT2 7
OUT3 8
OUT4 9
OUT5 10
OUT6 11
OUT7 12
24
23
22
21
20
19
18
17
16
15
14
13
VDD
R-EXT
SDO
OE
OUT15
OUT14
OUT13
OUT12
OUT11
OUT10
OUT9
OUT8
OUT0 ~ OUT15 Constant current output terminals
Output enable terminal
21
OE
22
SDO
23
R-EXT
24
VDD
When (active) low, the output drivers are
enabled; when high, all output drivers are
turned OFF (blanked).
Serial-data output to the following SDI of
next driver IC
Input terminal used to connect an external
resistor for setting up output current for all
output channels
3.5V / 5V supply voltage terminal
-2-
January 2004, V0.9
MBI5025
16-bit Constant Current LED Sink Driver
Equivalent Circuits of Inputs and Outputs
LE terminal
OE terminal
VDD
VDD
IN
IN
CLK, SDI terminal
SDO terminal
VDD
VDD
OUT
IN
-3-
January 2004, V0.9
MBI5025
16-bit Constant Current LED Sink Driver
Timing Diagram
N=0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
CLK
SDI
LE
OE
OFF
OUT0
ON
OFF
OUT1
ON
OFF
OUT2
ON
OFF
OUT3
ON
OFF
OUT15
ON
SDO
: don’t care
Truth Table
CLK
LE
OE
SDI
OUT0 … OUT 7 … OUT15
SDO
H
L
Dn
Dn ….. Dn - 7 …. Dn - 15
Dn-15
L
L
Dn+1
No Change
Dn-14
H
L
Dn+2
Dn + 2 …. Dn - 5 …. Dn - 13
Dn-13
X
L
Dn+3
Dn + 2 …. Dn - 5 …. Dn - 13
Dn-13
X
H
Dn+3
Off
Dn-13
-4-
January 2004, V0.9
MBI5025
16-bit Constant Current LED Sink Driver
Maximum Ratings
Characteristic
Symbol
Rating
Unit
Supply Voltage
VDD
0~7.0
V
Input Voltage
VIN
-0.4~VDD + 0.4
V
Output Current
IOUT
+50
mA
Output Voltage
VDS
-0.5~+20.0
V
Clock Frequency
FCLK
25
MHz
GND Terminal Current
IGND
1440
mA
Operating Temperature
Topr
-40~+85
°C
Storage Temperature
Tstg
-55~+150
°C
Thermal Resistance
(On PCB, Ta=25°C)
CN – type
53.82
CNS – type
66.74
Rth(j-a)
CD– type
49.81
CF – type
59.01
CP – type
72.43
-5-
°C/W
January 2004, V0.9
MBI5025
16-bit Constant Current LED Sink Driver
Recommended Operating Conditions
Characteristic
Symbol
Condition
Supply Voltage
VDD
-
Output Voltage
Output Current
Min.
Typ.
Max.
4.5
5.0
5.5
3.0
3.3
3.6
Unit
V
VDS
OUT0 ~ OUT15
-
-
17.0
V
IOUT
DC Test Circuit
3
-
35
mA
IOH
SDO
-
-
-1.0
mA
IOL
SDO
-
-
1.0
mA
VIH
CLK, OE , LE and SDI
0.8VDD
-
VDD+0.3
V
VIL
CLK, OE , LE and SDI
-0.3
-
0.3VDD
V
Input Voltage
LE Pulse Width
tw(L)
40
-
-
ns
CLK Pulse Width
tw(CLK)
20
-
-
ns
OE Pulse Width
tw(OE)
400
-
-
ns
VDD=4.5~5.5V
Setup Time for SDI
tsu(D)
5
-
-
ns
Hold Time for SDI
th(D)
10
-
-
ns
Setup Time for LE
tsu(L)
15
-
-
ns
Hold Time for LE
th(L)
15
-
-
ns
Clock Frequency
FCLK
-
-
25.0
MHz
Cascade Operation
-6-
January 2004, V0.9
MBI5025
16-bit Constant Current LED Sink Driver
Electrical Characteristics
Symbol
Condition
Min.
Typ.
Max.
Unit
“H” level
VIH
Ta = -40~85ºC
0.8VDD
-
VDD
V
“L” level
VIL
Ta = -40~85ºC
GND
-
0.3VDD
V
Output Leakage Current
IOH
VOH=17.0V
-
-
0.5
μA
VOL
IOL=+1.0mA
-
-
0.4
V
VOH
IOH=-1.0mA
4.6
-
-
V
Characteristic
Input Voltage
Output Voltage
SDO
IOUT1
VDS=0.5V
Rext=1260 Ω
-
15.0
-
mA
Current Skew
dIOUT1
IOL=15mA
VDS=0.5V
Rext=1260 Ω
-
±1
±3
%
Output Current 2
IOUT2
VDS=0.8V
Rext=620 Ω
-
30.0
-
mA
Current Skew
dIOUT2
IOL=30mA
VDS=0.8V
Rext=620 Ω
-
±1
±3
%
Output Current 1
Output Current vs.
Output Voltage Regulation
%/dVDS
VDS within 1.0V and 3.0V
-
±0.1
-
%/V
Output Current vs.
Supply Voltage Regulation
%/dVDD
VDD within 4.5V and 5.5V
-
±1
-
%/V
RIN(up)
OE
250
500
800
KΩ
RIN(down)
LE
250
500
800
KΩ
Pull-up Resistor
Pull-down Resistor
“OFF”
Supply
Current
“ON”
IDD(off) 1
Rext=Open,
OUT0 ~ OUT15
=Off
-
9
-
IDD(off) 2
Rext=1260 Ω,
OUT0 ~ OUT15
=Off
-
10
-
IDD(off) 3
Rext=620 Ω,
OUT0 ~ OUT15
=Off
-
11
-
IDD(on) 1
Rext=1260 Ω,
OUT0 ~ OUT15
=On
-
10
-
IDD(on) 2
Rext=620 Ω,
OUT0 ~ OUT15
=On
-
11
-
mA
Test Circuit for Electrical Characteristics
IDD
VDD
IIH,IIL
IOUT
..
..
OUT0
OE
CLK
LE
OUT15
SDI
R - EXT GND
SDO
VIH, VIL
Iref
-7-
January 2004, V0.9
MBI5025
16-bit Constant Current LED Sink Driver
Switching Characteristics
Characteristic
Symbol
Condition
Min.
Typ.
Max.
Unit
CLK - OUTn
tpLH1
-
50
100
ns
LE - OUTn
tpLH2
-
50
100
ns
OE - OUTn
tpLH3
-
20
100
ns
CLK - SDO
tpLH
15
20
-
ns
CLK - OUTn
tpHL1
-
100
150
ns
LE - OUTn
tpHL2
-
100
150
ns
OE - OUTn
tpHL3
-
50
150
ns
CLK - SDO
tpHL
15
20
-
ns
CLK
tw(CLK)
20
-
-
ns
LE
tw(L)
20
-
-
ns
OE
tw(OE)
400
-
-
ns
Hold Time for LE
th(L)
5
-
-
ns
Setup Time for LE
tsu(L)
5
-
-
ns
Maximum CLK Rise Time
tr**
-
-
500
ns
Maximum CLK Fall Time
tf**
-
-
500
ns
Output Rise Time of Iout
tor
-
70
200
ns
Output Fall Time of Iout
tof
-
40
120
ns
Propagation Delay Time
(“L” to “H”)
Propagation Delay Time
(“H” to “L”)
Pulse Width
VDD=5.0 V
VDS=0.8 V
VIH=VDD
VIL=GND
Rext=300 Ω
VL=4.0 V
RL=52 Ω
CL=10 pF
※If the devices are connected in cascade and tr or tf is large, it may be critical to achieve the timing required for
data transfer between two cascaded devices.
Test Circuit for Switching Characteristics
IDD
IOUT
VDD
VIH, VIL
Function
Generator
..
.
OUT0
OE
CLK
LE
OUT15
RL
SDI
R - EXT GND
SDO
CL
Logic input
waveform
VIH = 5V
VL
CL
Iref
VIL = 0V
tr = tf = 10 ns
-8-
January 2004, V0.9
MBI5025
16-bit Constant Current LED Sink Driver
Timing Waveform
tW(CLK)
CLK
tsu(D)
SDI
50%
50%
50%
50%
th(D)
50%
SDO
50%
tW(L)
tpLH, tpHL
LE
50%
50%
th(L)
OE
tsu(L)
LOW = OUTPUTS ENABLED
HIGH = OUTPUT OFF
50%
OUTn
LOW = OUTPUT ON
tpLH1, tpHL1
tpLH2, tpHL2
tW(OE)
OE
50%
50%
tpLH3
tpHL3
90%
50%
10%
OUTn
tof
-9-
90%
50%
10%
tor
January 2004, V0.9
MBI5025
16-bit Constant Current LED Sink Driver
Application Information
Constant Current
To design LED displays, MBI5025 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 ±6%.
2) In addition, the current characteristic of output stage is flat and users can refer to the figure
as shown below. The output current can be kept constant regardless of the variations of LED
forward voltages (Vf). This performs as a perfection of load regulation.
Adjusting Output Current
The output current of each channel (IOUT) is set by an external resistor, Rext. The relationship
between Iout and Rext is shown in the following figure.
60
Iout (mA)
50
40
30
VDS = 1.0V
20
10
0
0
500
1000
1500
2000
2500
Rext (Ω)
Resistance of the external resistor, Rext, in Ω
Also, the output current can be calculated from the equation:
VR-EXT = 1.26V；IOUT = (VR-EXT / Rext ) x 15
where Rext is the resistance of the external resistor connected to R-EXT terminal and VR-EXT is
the voltage of R-EXT terminal. The magnitude of current (as a function of Rext) is around 30mA
at 620Ω and 15mA at 1260Ω.
- 10 -
January 2004, V0.9
MBI5025
16-bit Constant Current LED Sink Driver
Package Power Dissipation (PD)
The maximum allowable package power dissipation is determined as P D(max) = (Tj – Ta) / Rth(j-a).
When 16 output channels are turned on simultaneously, the actual package power dissipation is
PD(act) = (IDD x VDD) + (IOUT x Duty x VDS x 16). Therefore, to keep P D(act) ≤ PD(max), the
allowable maximum output current as a function of duty cycle is:
IOUT = { [ (Tj – Ta) / Rth(j-a) ] – (IDD x VDD) } / VDS / Duty / 16, where Tj = 150°C.
Load Supply Voltage (VLED)
MBI5025 are designed to operate with VDS ranging from 0.4V to 0.8V (IOUT=5~35mA)
considering the package power dissipating limits. VDS may be higher enough to make PD(act) >
PD(max) when VLED = 5V and VDS = VLED – Vf, in which VLED is the load supply voltage. In this
case, it is recommended to use the lowest possible supply voltage or to set an external voltage
reducer, VDROP.
A voltage reducer lets VDS = (VLED – Vf) – VDROP.
Resistors or Zener diode can be used in the applications as shown in the following figures.
VLED
VLED
VDROP
VDROP
Vf
Vf
VDS
VDS
MBI5025
MBI5025
- 11 -
January 2004, V0.9
MBI5025
16-bit Constant Current LED Sink Driver
Package Outline
MBI5025CNS Outline Drawing
MBI5025CD Outline Drawing
- 12 -
January 2004, V0.9
MBI5025
16-bit Constant Current LED Sink Driver
MBI5025CF Outline Drawing
MBI5025CP Outline Drawing
- 13 -
January 2004, V0.9