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Features
Preliminary Datasheet
MBI5027
16-bit Constant Current LED Sink Driver with Error Detection
MBI5027CNS MBI5016CNS
* Error Detection mode to detect LED open-circuit errors * 16 constant-current output channels * Constant output current invariant to load voltage change * Excellent output current accuracy: between channels: 3% (max.), and between ICs: 6% (max.) * Output current adjusted through an external resistor * Constant output current range: 5-90 mA * Fast response of output current, OE (min.): 200 ns * 25MHz clock frequency * Schmitt trigger input * 5V supply voltage
MBI5027CF MBI5016CF
MBI5027CP MBI5016CP
Current Accuracy Between Channels Between ICs < 3% < 6%
Conditions IOUT = 10 mA ~ 60 mA
OMacroblock, 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: info@mblock.com.tw -1-
MBI5027
16-bit Constant Current LED Sink Driver with Error Detection
Product Description
MBI5027 succeeds MBI5026 and is designed for LED displays with open-circuit Error Detection extension. MBI5027 exploits PrecisionDriveTM technology to enhance its output characteristics. MBI5027 contains a serial buffer and data latches, which convert serial input data into parallel output format. At MBI5027 output stage, sixteen regulated current ports are designed to provide uniform and constant current sinks for driving LEDs within a wide range of Vf variations. While MBI5027 is used in their system design for LED display applications, e.g. LED panels, it provides users with great flexibility and device performance. Users may adjust the output current from 5 mA to 90 mA through an external resistor, Rext, which gives users flexibility in controlling the light intensity of LEDs. MBI5027 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. MBI5027 exploits the idea of Share-I-OTM technology to extend its performancein addition, MBI5027 is backward compatible with MBI5026 in both electrical characteristics and package aspect. With Share-I-OTM technology, users can, without changing the printed circuit board originally for MBI5026, let MBI5027 enter a special function mode, an Error Detection mode, just by setting a sequence of signals on LE(ED1), OE (ED2) and CLK input pins. In the Error Detection mode, MBI5027 detects the status of individual LED connected to MBI5027. The status will be saved in a built-in register. Then, a system controller may read, through SDO pin, the error status from the register to know whether LEDs are properly lit or not. By setting another sequence of signals on LE(ED1), OE (ED2) and CLK input pins, MBI5027 may resume to a Normal mode and perform as MBI5026. In Application Information, users can get detailed ideas about how MBI5027 works in the Error Detection mode. A Share-I-OTM technique is specifically applied to MBI5027. By means of the Share-I-OTM technique, an additionally effective function, Error Detection, can be added to LED drivers, however, without any extra pins. Thus, MBI5027 could be a drop-in replacement of MBI5026. The printed circuit board originally designed for MBI5026 may be also applicable for MBI5027. For MBI5027, the pin 4, LE(ED1), and the pin 21, OE (ED2), can be acted as different functions as follows:
Pin Device Name Function Description of Pin 4 Function Description of Pin 21 MBI5027 LE + Error Detection (ED1) OE + Error Detection (ED2)
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April 2003, V0.8-4
MBI5027 Block Diagram
16-bit Constant Current LED Sink Driver with Error Detection
OUT0
OUT1
OUT14
OUT15
R-EXT
VDD
IO Regulator
OE(ED2)
LE(ED1)
GND
Control Logic
Output Driver & Error Detector 16 16-bit Output Latch 16 16-bit Shift Register 16 SDO
CLK SDI
Terminal Description
Pin No.
1 2 3
Pin Configuration
Function
GND SDI CLK LE(ED1) OUT0 OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VDD R-EXT SDO OE(ED2) OUT15 OUT14 OUT13 OUT12 OUT11 OUT10 OUT9 OUT8
Pin Name
GND SDI CLK
Ground terminal for control logic and current sink Serial-data input to the Shift Register Clock input terminal for data shift on rising edge Data strobe input terminal Serial data is transferred to the respective latch when LE(ED1) is high. The data is latched when LE(ED1) goes low. Also, a control signal input for Error Detection mode (See Timing Diagram)
4
LE(ED1)
5~20
OUT0 ~ OUT15 Constant current output terminals Output enable terminal
21
OE (ED2)
When (active) low, the output drivers are enabled; when high, all output drivers are turned OFF (blanked). Also, a control signal input for Error Detection mode (See Timing Diagram)
22
SDO
Serial-data output to the following SDI of next driver IC Input terminal used to connect an external resistor for setting up all output current 5V supply voltage terminal -3April 2003, V0.8-4
23 24
R-EXT VDD
MBI5027
16-bit Constant Current LED Sink Driver with Error Detection
Equivalent Circuits of Inputs and Outputs
OE(ED2) terminal
VDD
LE(ED1) terminal
VDD
IN
IN
CLK, SDI terminal
VDD
SDO terminal
VDD
IN
OUT
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April 2003, V0.8-4
MBI5027 Timing Diagram Normal Mode
N=0 1 2 3
16-bit Constant Current LED Sink Driver with Error Detection
4
5
6
7
8
9
10
11
12
13
14
15
CLK SDI LE(ED2)
OE(ED2) OUT0 OUT1 OUT2 OUT3
OFF ON OFF ON OFF ON OFF ON
OFF
OUT15
SDO
ON
: don't care
Truth Table (In Normal Mode)
CLK LE H L H X X
OE
L L L L H
SDI Dn Dn+1 Dn+2 Dn+3 Dn+3
OUT0 ... OUT 7 ... OUT15
Dn .... Dn - 7 .... Dn - 15 No Change Dn + 2 .... Dn - 5 .... Dn - 13
SDO Dn-15 Dn-14 Dn-13 Dn-13 Dn-13
Dn + 2 .... Dn - 5 .... Dn - 13
Off
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April 2003, V0.8-4
MBI5027
16-bit Constant Current LED Sink Driver with Error Detection
Entering Error Detection Mode
1 2 3 4 5
CLK
OE(ED2)
LE(ED1)
1 0
0 0
1 0
1 1
1 0
The signal sequence makes MBI5027 enter an Error Detection mode.
Reading Error Status Code
CLK OE (ED2) SDO about 2 s
Error Status Code
Bit15 Bit14 Bit13 Bit12 Bit11
: don't care
A system controller can read Error Status codes through SDO pin.
Resuming to Normal Mode
1 2 3 4 5
CLK
OE(ED2)
LE(ED1)
1 0
0 0
1 0
1 0
1 0
Voltage "Low"
The signal sequence makes MBI5027 resume to the Normal mode.
Note: If users want to know the whole process, that is how to enter the Error Detection mode, read Error Status codes and resume to the Normal mode, please refer to the contents in Application Information.
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April 2003, V0.8-4
MBI5027
16-bit Constant Current LED Sink Driver with Error Detection
Maximum Ratings
Characteristic Supply Voltage Input Voltage Output Current Output Voltage Clock Frequency GND Terminal Current CNS - type Power Dissipation (On PCB, Ta=25C) CF - type CP - type CNS - type Thermal Resistance (On PCB, Ta=25C) Operating Temperature Storage Temperature CF - type CP - type Topr Tstg Rth(j-a) PD Symbol VDD VIN IOUT VDS FCLK IGND Rating 0~7.0 -0.4~VDD + 0.4 +90 -0.5~+20.0 25 1440 1.52 1.30 1.11 82 96 112 -40~+85 -55~+150 C C C/W W Unit V V mA V MHz mA
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April 2003, V0.8-4
MBI5027
16-bit Constant Current LED Sink Driver with Error Detection
Recommended Operating Conditions
Characteristic Supply Voltage Output Voltage Symbol VDD VDS IOUT Output Current IOH IOL Input Voltage VIH VIL LE(ED1) Pulse Width CLK Pulse Width OE (ED2) Pulse Width Setup Time for SDI Hold Time for SDI Setup Time for LE(ED1) Hold Time for LE(ED1) OE (ED2) Pulse Width CLK Pulse Width Setup Time for LE(ED1) Hold Time for LE(ED1) Setup Time for OE (ED2) Hold Time for OE (ED2) Clock Frequency tw(L) tw(CLK) tw(OE) tsu(D) th(D) tsu(L) th(L) tw(ED2) tw(CLK) tsu(ED1) th(ED1) tsu(ED2) th(ED2) FCLK Cascade Operation Ta=85C (CNS type) Power Dissipation PD Ta=85C (CF type) Ta=85C (CP type) Error Detection Mode VDD=4.5~5.5V Normal Mode VDD=4.5~5.5V Condition Min. 4.5 5 0.8VDD -0.3 40 20 200 5 10 15 15 2 20 5 10 5 10 Typ. 5.0 Max. 5.5 17.0 60 -1.0 1.0 VDD+0.3 0.3VDD 25.0 0.79 0.67 0.57 W Unit V V mA mA mA V V ns ns ns ns ns ns ns us ns ns ns ns ns MHz
OUT0 ~ OUT15
DC Test Circuit SDO SDO CLK, OE (ED2), LE(ED1) and SDI CLK, OE (ED2), LE(ED1) and SDI
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April 2003, V0.8-4
MBI5027
16-bit Constant Current LED Sink Driver with Error Detection
Electrical Characteristics
Characteristic Input Voltage "H" level "L" level Symbol VIH VIL IOH VOL VOH IOUT1 dIOUT1 IOUT2 dIOUT2 %/dVDS %/dVDD RIN(up) RIN(down) VDS, Th1 Open Circuit Error*** Discrimination Voltage VDS, Th2 VDS, Th3 VDS, Th4 IDD(off) 1 "OFF" Supply Current "ON" IDD(off) 2 IDD(off) 3 IDD(on) 1 IDD(on) 2 Condition Ta = -40~85C Ta = -40~85C VOH=17.0V IOL=+1.0mA IOH=-1.0mA VDS=0.6V IOL=25mA VDS=0.6V VDS=0.8V IOL=50mA VDS=0.8V Rext=720 Rext=720 Rext=360 Rext=360 Min. 0.8VDD GND 4.6 Typ. 25.0 Max. VDD 0.3VDD 0.5 0.4 Unit V V A V V mA
Output Leakage Current Output Voltage SDO
Output Current 1 Current Skew
-
1
3
%
Output Current 2 Current Skew Output Current vs. Output Voltage Regulation Output Current vs. Supply Voltage Regulation Pull-up Resistor Pull-down Resistor
-
50.0
-
mA
250 250 1.0 0.8 1.2 1.0 -
1 0.1 1 500 500 9 11 14 11 14
3 800 800 -
% %/V %/V K K V V V V
VDS within 1.0V and 3.0V VDD within 4.5V and 5.5V OE (ED2) LE(ED1) When all output ports sink 20mA simultaneously When a single output port sinks 20mA When all output ports sink 50mA simultaneously When a single output port sinks 50mA Rext=Open, OUT0 ~ OUT15 =Off Rext=720 , OUT0 ~ OUT15 =Off Rext=360 , OUT0 ~ OUT15 =Off Rext=720 , OUT0 ~ OUT15 =On Rext=360 , OUT0 ~ OUT15 =On
mA
*** To effectively detect the error occurring at the output port, MBI5027 has a built-in current detection
circuit. The current detection circuit will detect the effective current IOUT, effective, and compare the effective current IOUT, effective, to the target current IOUT, target, defined by Rext. If IOUT, effective, is much less than the target current IOUT, target, an error flag will be asserted in the built-in Shift Register. The minimum voltage requirement for such current detection is VDS, Th1, VDS, Th2, VDS, Th3 and VDS, Th4.
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April 2003, V0.8-4
MBI5027
16-bit Constant Current LED Sink Driver with Error Detection
Test Circuit for Electrical Characteristics
IDD
VDD OE(ED2)
IOUT
OUT0
IIH,IIL
CLK LE(ED1) SDI R - EXT GND
. . . .
OUT15 SDO
VIH, VIL
Iref
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April 2003, V0.8-4
MBI5027
16-bit Constant Current LED Sink Driver with Error Detection
Switching Characteristics
Characteristic CLK - OUTn Propagation Delay Time LE(ED1) - OUTn ("L" to "H") OE (ED2) - OUTn CLK - SDO CLK - OUTn Propagation Delay Time ("H" to "L") LE(ED1) - OUTn OE (ED2) - OUTn CLK - SDO CLK Pulse Width LE(ED1) OE (ED2) Hold Time for LE(ED1) Setup Time for LE(ED1) Maximum CLK Rise Time Maximum CLK Fall Time Output Rise Time of Iout Output Fall Time of Iout Symbol tpLH1 tpLH2 tpLH3 tpLH tpHL1 tpHL2 tpHL3 tpHL tw(CLK) tw(L) tw(OE) th(L) tsu(L) tr** tf** tor tof VDD=5.0 V VDS=0.8 V VIH=VDD VIL=GND Rext=300 VL=4.0 V RL=52 CL=10 pF Condition Min. 15 15 20 20 200 5 5 Typ. 50 50 20 20 100 100 50 20 70 40 Max. 100 100 100 150 150 150 500 500 200 120 Unit ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns
**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
VIH, VIL
VDD OE(ED2) CLK LE(ED1) SDI R - EXT GND
IOUT
OUT0
Function Generator
. . .
OUT15 SDO
RL CL VL
Logic input waveform VIH = 5V VIL = 0V tr = tf = 10 ns
Iref
CL
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April 2003, V0.8-4
MBI5027 Timing Waveform Normal Mode
16-bit Constant Current LED Sink Driver with Error Detection
tW(CLK)
CLK
50%
50%
50%
tsu(D)
th(D)
50%
SDI
50%
SDO
tpLH, tpHL
50%
tW(L)
50% 50%
LE(ED1)
th(L)
tsu(L)
LOW = OUTPUTS ENABLED HIGH = OUTPUT OFF
OE(ED2) OUTn
50%
tpLH1, tpHL1
LOW = OUTPUT ON
tpLH2, tpHL2
tW(OE)
50% 50%
OE(ED2)
tpHL3
90% 50% 10%
tpLH3
90% 50% 10%
OUTn
tof
tor
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April 2003, V0.8-4
MBI5027
16-bit Constant Current LED Sink Driver with Error Detection
Entering Error Detection Mode
tW(CLK)
CLK
50%
50%
50%
50%
50%
tsu(ED2) th(ED2)
OE(ED2)
50%
50%
tsu(ED1)
th(ED1)
50%
LE(ED1)
2 CLK
50%
Reading Error Status Code
CLK
50%
50%
OE(ED2)
50%
50%
tw(ED2)
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April 2003, V0.8-4
MBI5027
16-bit Constant Current LED Sink Driver with Error Detection
Application Information Constant Current
To design LED displays, MBI5027 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 complete function of the load regulation.
100.00 90.00 80.00
Iout (mA)
70.00 60.00 50.00 40.00 30.00 20.00 10.00 0.00 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 2 2.5
VDS (V)
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April 2003, V0.8-4
MBI5027
16-bit Constant Current LED Sink Driver with Error Detection
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.
IOUT (mA)
100 90 80 70 60 50 40 30 20 10 0 0 500 1000 1500 2000 2500 3000 3500 4000
VDS = 1.0V
Resistance of the external resistor, Rext, in Also, the output current in milliamps can be calculated from the equation: IOUT is (625/ Rext) x 28.8, approximately, where Rext, in , is the resistance of the external resistor connected to R-EXT terminal. The magnitude of current is around 50mA at 360 and 25mA at 720.
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April 2003, V0.8-4
MBI5027
16-bit Constant Current LED Sink Driver with Error Detection
Entering Error Detection Mode
1 2 3 4 5
CLK
OE(ED2)
LE(ED1)
1 0
0 0
1 0
1 1
1 0
Each time the system controller sends the sequence patterns shown above, MBI5027 can enter the Error Detection mode. During this phase, the system controller can still send data through SDI pin. The state of OE (ED2) and LE(ED1) is sampled by the rising edge of each CLK. We use "0" and "1" to represent the state of "Voltage Low" and "Voltage High" respectively. The states of the successive five OE (ED2) and LE(ED1) are (1, 0), (0, 0), (1, 0), (1, 1) and (1, 0).
Reading Error Status Code
CLK about 2 s 0 1 1 1 1
OE(ED2)
SDO
1
0
0
Error Status Code
Bit15 Bit14 Bit13 Bit12 Bit11
Once entering the Error Detection mode, the Error Detection takes place by changing the state of OE (ED2) from "Voltage High" to "Voltage Low". The built-in current detection circuit will detect the effective current IOUT, effective of each output channel, and compare it to the target current IOUT, target, defined by Rext. If the IOUT, effective , is much less than the target current IOUT, target, an error status code will be represented as "0" state. During the period of detecting errors, data cannot be sent into MBI5027 through SDI pin. The "Voltage Low" state of OE (ED2) requires at least three "0" of which the last "0" should be at least 2s after the falling edge of OE (ED2). The occurrence of the last "0" results in the event that MBI5027 saves the error status in the built-in register. The mentioned state of each "0" is sampled by the rising edge of each CLK. Before the error status saved in the built-in register is read, the state of OE (ED2) should be pulled up from "Voltage Low" to "Voltage High". Then, by sending CLK, MBI5027 shifts out, through SDO pin, the error status bit by bit.
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April 2003, V0.8-4
MBI5027
16-bit Constant Current LED Sink Driver with Error Detection
Resuming to Normal Mode
1 2 3 4 5
CLK OE(ED2) LE(ED1)
1 0
0 0
1 0
1 0
1 0
Voltage "Low"
Each time the system controller sends the sequence patterns shown above, MBI5027 can resume to the Normal mode. During this phase, the system controller can still send data through SDI pin. The state of OE (ED2) and LE(ED1) is sampled by the rising edge of each CLK. We use "0" and "1" to represent the state of "Voltage Low" and "Voltage High" respectively. The states of the successive five OE (ED2) and LE(ED1) are (1, 0), (0, 0), (1, 0), (1, 0) and (1, 0).
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April 2003, V0.8-4
MBI5027
16-bit Constant Current LED Sink Driver with Error Detection
Timing Chart for Error Detection Mode (An Example)
N x MBI5027 are connected in cascade, ie, SDO, k --> SDI, k+1. And, all MBI5027 ICs are connected to the same CLK, LE(ED1) and OE (ED2) signals. SDO, 2 SDO, 0 SDI, 1 SDO, 1 N-1 SDI, 0 MBI5027, 0 MBI5027, 1 MBI5027, 2 CLK LE(ED1) OE (ED2) 1 CLK SDI, 0 N-1 N x 16 -1 LE(ED1) Serial Data (Note 1) LE(ED1) SDI, 0 2 1 0 T1 = 2 CLK T2 = 2s Don't Care Could Be "Don't Care" SDI, 0 2 3 4 5 N x 16 CLK Pulses (Note 1) th(L) 3 CLK Pulses Required (Note 2) N x 16 CLK Pulses (Note 3) 1 2 3 4 5 LED j, j = 0... (N x16 -1) SDO, N-1 N-1
MBI5027, N-2
MBI5027, N-1
OE (ED2)
OE (ED2)
T3 (Note 2)
SDO, 0 N-1 SDO, 1
15 31
14 30
N x 16 -2
A Entering the Error Detection Mode
B
C
SDO, N-1 N-1
N x 16
2 D Reading Back the Error Status Code
1
0
Detecting the Error Status Sending the Normal Image Data (or Test Data) Serial Data k, k = 0... (N x 16 -1) Note 2: T1 = 2 CLK pluses is required to start the error detection. Note 1: N x 16 CLK pulses before the T2 = 2 s is required to obtain the stable error status result. next LE shift the valid image data. N x T3 = the third CLK pulses is required before OE (ED2) goes 16 "1"s are suggested. voltage high. The rising edge of CLK writes the error status code back to the MBI5027 built-in shift register.
Resuming to the Normal Mode
Note 3: The first rising edge of CLK after the rising edge of OE (ED2) starts shifting the Image Data with LED Error. An LED error will be represented by a "0", to over write the original image data "1". Image Data k, k = 0... (N x 16 -1), = all "1" is suggested. N x 16 CLK pulses shift all N x 16 error results (Error Status Code) via Node SDO, N
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April 2003, V0.8-4
MBI5027
16-bit Constant Current LED Sink Driver with Error Detection
Package Power Dissipation (PD)
The maximum allowable package power dissipation is determined as PD(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 PD(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 = 150C. (A) Iout = 90mA, VDS = 1.0V, 16 output channels active For CNS type package, the thermal resistance is Rth(j-a) = 82 (C/W)
Iout vs. Duty Cycle at Rth = 82 (C/W)
100 90 80 70 60 50 40 30 20 10 0 5% 10% 15%
Iout (mA)
Ta = 25C Ta = 55C Ta = 85C
20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 95% 100% 100%
Duty Cycle
For CF type package, the thermal resistance is Rth(j-a) = 96 (C/W)
Iout vs. Duty Cycle at Rth = 96 (C/W)
100 90 80 70 60 50 40 30 20 10 0 5% 10% 15%
Iout (mA)
Ta = 25 Ta = 55 Ta = 85
20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90%
Duty Cycle
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April 2003, V0.8-4
MBI5027
16-bit Constant Current LED Sink Driver with Error Detection
For CP type package, the thermal resistance is Rth(j-a) = 112 (C/W)
Iout vs. Duty Cycle at Rth = 112 (C/W)
100 90 80 70 60 50 40 30 20 10 0 5% 10%
Iout (mA)
Ta = 25C Ta = 55C Ta = 85C
15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%
Duty Cycle
(B) Iout = 60mA, VDS = 0.8V, 16 output channels active For CNS type package, the thermal resistance is Rth(j-a) = 82 (C/W)
Iout vs. Duty Cycle at Rth = 82 (C/W)
70 60 50
Iout (mA)
40 30 20 10 0 5% 10% 15%
Ta = 25C Ta = 55C Ta = 85C
20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%
Duty Cycle
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April 2003, V0.8-4
MBI5027
16-bit Constant Current LED Sink Driver with Error Detection
For CF type package, the thermal resistance is Rth(j-a)= 96 (C/W)
Iout vs. Duty Cycle at Rth = 96 (C/W)
70 60 50 Iout (mA) 40 30 20 10 0 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%
Ta = 25C Ta = 55C Ta = 85C
Duty Cycle
For CP type package, the thermal resistance is Rth(j-a) = 112 (C/W)
Iout vs. Duty Cycle at Rth = 112 (C/W)
70 60 50
Iout (mA)
40 30 20 10 0
5% 10% 15% 20%
Ta = 25C Ta = 55C Ta = 85C
25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%
Duty Cycle
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April 2003, V0.8-4
MBI5027
16-bit Constant Current LED Sink Driver with Error Detection
The maximum power dissipation, PD(max) = (Tj-Ta) / Rth(j-a) , decreases as the ambient temperature increases.
Max. Power Dissipation at Various Ambient Temperature
1.6 1.4
Power Dissipation
1.2 1 0.8 0.6 0.4 0.2 0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
CNS Type: Rth = 82 CF Type: Rth = 96 CP Type: Rth = 112
Ambient Temperature
Load Supply Voltage (VLED)
MBI5027 are designed to operate with V DS ranging from 0.4V to 1.0V considering the package power dissipating limits. V DS 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 the following figures.
VLED VDROP VLED VDROP
Vf VDS
Vf
VDS
MBI5027
MBI5027
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April 2003, V0.8-4
MBI5027 16-bit Constant Current LED Sink Driver with Error Detection Package Outlines MBI5027CNS Outline Drawing
SDIP-24-P-300-1.78 Units: mm Weight: 1.11g (typ)
MBI5027CF Outline Drawing
SOP-24-P-300-1.00 Units: mm Weight: 0.28g (typ)
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April 2003, V0.8-4
MBI5027
16-bit Constant Current LED Sink Driver with Error Detection
MBI5027CP Outline Drawing
SSOP24-P-150-0.64 Units: mm Weight: 0.11g (typ)
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April 2003, V0.8-4

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