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SD16729
16-BIT CONSTANT CURRENT LED DRIVER
DESCRIPTION
SD16729 is a constant current LED driver with advanced Bi-CMOS technology, the constant current is determined by external resistor. It includes a 16-bit shift register, latches, the constant current driver and etc. In the output stage, there are 16 current sources which provide a 1-45mA constant current drive for LED through bipolar device.
SSOP-24-225-0.635
FEATURES
* Output current adjustable through external resistor * Data serial-in/serial-out * 16-channel constant current output * Output current: 1~45mA * 30MHz clock frequency * Fast output current response, ENABLE min. width:30ns * Current Precision (all output are ON) Precision Between bits <2% Between ICs <3% Output current:1~15mA Test Condition
SSOP-24-300-1.0
APPLICATIONS
* LED screen
ORDERING INFORMATION
Device SD16729P SD16729S Package SSOP-24-300-1.0 SSOP-24-225-0.635 Marking SD16729P SD16729S
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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SD16729
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATING (Tamb=25C)
Characteristics Supply Voltage Input Voltage Output Current Output Voltage Power Dissipation Power Dissipation Thermal Resistance Thermal Resistance SD16729S SD16729P SD16729S SD16729P Symbol VDD VIN IOUT VOUT PD1 PD2 Rth(j-a)1 Rth(j-a)2 Tstg Topr Ratings 6 -0.2~VDD+0.2 50 -0.2~ 17 1.04 1.32 120 94 -55~+150 -40 ~ 85 Unit V V mA/ch V W W C/W C/W C C
Storage Temperature Operating Temperature
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SD16729
OPERATING CONDITION RECOMMENDED
Characteristics Supply Voltage Output Voltage Output Current Symbol VDD VOUT IOUT IOH IOL Input Voltage Input Voltage CLOCK Frequency LATCH Setup Time LATCH Hold Time CLOCK Pulse Width ENABLE Pulse Width CLOCK Setup Time CLOCK Hold Time VIH VIL Fclk tSU(L) th(L) tCLK tENA tsu(C) th(C) IOUT = 20 mA, conntected to LED for test SERIAL-OUT SERIAL-OUT Cascaded Test conditions Min. 3.0 0.5 1 0.76VDD -0.15 5 30 20 30 10 10 Typ. 1 Max. 5.5 17 45 1 -1 VDD+ 0.15 0.26VDD 30 Unit V V mA/ch mA mA V V MHz nS nS nS nS nS nS
ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Tamb=25C, VDD=3.0V-5.5V)
Characteristics Supply Voltage Symbol VDD IOUT1 IOUT2 IOUT3 Output Current IOUT4 IOUT5 IOUT6 Output Leakage Current Output Current Precision (Bit To Bit) Iok IOUT1 IOUT2 VDD=3.3V VOUT=1V VDD=5.0V VOUT=1V VDD=3.3V VOUT=1V VDD=5.0V VOUT=1V VDD=3.3V VOUT=1V VDD=5.0V VOUT=1V VOUT=15.0V VOUT>0.7V VOUT>0.7V REXT=1.2k REXT=12k REXT = 12k 1.5 1.55 1 1.6 1 2 mA uA % REXT=1.2k 14.81 1.5 15.25 1.55 15.69 1.6 mA mA REXT=470 38.53 14.81 39.55 15.25 40.61 15.69 mA mA Test conditions Min. 3.0 38.53 Typ. 39.55 Max. 5.5 40.61 Unit V mA
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SD16729
Characteristics Output Voltage (SOUT) Output Voltage (SOUT) Output Current Regulation Pull-Down Resistance Pull-Up Resistance Supply Current OFF Symbol VOH VOL %/VDD RIN(up) IOFF Test conditions IOH=-1.0 mA, VDD=3.3 V IOH=-1.0 mA, VDD=5.0 V IOL=1.0 mA, VDD=3.3 V IOL=1.0 mA, VDD=5.0 V VDD: 3.0V5.0V VOUT=15.0V, REXT =470 VOUT=15.0V, REXT =1.2k VOUT=15.0V, REXT=12k VOUT=1V, REXT=470 ION VOUT=1V, REXT=1.2k VOUT=1V, REXT=12k VOUT=1V, Tamb=-40C, Supply Current ON ION REXT=470 VOUT=1V, Tamb= -40C, REXT=1.2k VOUT=1V, Tamb= -40C, REXT=12k tpLH1 Propagation Delay ("L" To "H") tpLH2 tpLH3 tpLH4 tpHL1 Propagation Delay ("H" To "L") tpHL2 tpHL3 tpHL4 Max. CLOCK Rise Time Max. CLOCK Fall Time tr tf CLK- OUTn , LATCH = "H" ENABLE ="L"
LATCH - OUTn , ENABLE ="L"
Min. 3 4.7 115 115 11.5 4.5 0.57 18 6.5 0.83 3 4 -
Typ. 1 250 250 13.14 5.2 0.72 20 7.95 1.04 50 50 50 10 20 20 20 10 -
Max. 0.3 0.3 2 460 460 15 6 0.86 23 9.5 1.24 30 13 1.5 70 70 70 15 50 50 50 15 500 500
Unit V V V V % k k mA mA mA mA mA mA mA mA mA ns ns ns ns ns ns ns ns ns ns
RIN(down) -
ENABLE - OUTn , LATCH ="H" CLKSERIAL OUT CLK- OUTn , LATCH = "H" ENABLE ="L"
LATCH - OUTn , ENABLE ="L"
ENABLE - OUTn , LATCH ="H" CLKSERIAL OUT -
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SD16729
PIN CONFIGURATION
GND SERIAL-IN CLOCK LATCH 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 SERIAL-OUT ENABLE OUT15 OUT14 OUT13 OUT12 OUT11 OUT10 OUT9 OUT8
SD16729P/SD16729S
PIN DESCRIPTION
Pin No. 1 2 3 4 5 ~ 20 21 22 23 24 Pin Name GND SERIAL-IN CLOCK I/O -I I I I/O I O I/O -Ground Shift register input pin Clock input pin for shift register Data strobe pin for the latch Output pins Output enable pin (active low) Shift register output pin External resistor connecting pin Power supply Pin Function
LATCH
OUT0 ~ OUT15
ENABLE
SERIAL-OUT R-EXT VDD
FUNCTION DESCROPTION
In the LED display applications, SD16729 can maintain almost no change in different channels or between the different chips. In the different channels, the current changes less than 2%, while between the different chips, the current changes less than 3%. There is only one pin connected to ground which is shared as analog ground, digital ground and power ground. It is recommended to route with min. inductance against switching noise and output current noise-induced IC faults. In order to obtain a good current output, the chip needs an appropriate output voltage. According to the electrical characteristics table, users can get minimum output voltage and other related information. Even in the same output current conditions, the minimum output voltage of every part is different. . In order to avoid noise interference, the resistance should be placed close to the pin R-EXT.
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SD16729
TIME SEQUENCE
NOTE: When LATCH is low, latch the data; When LATCH high, data is is transmitted from input to output of register; When ENABLE is low, normal response output; When ENABLE is high, output is not available.
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SD16729
SEQUENCE WAVEFORM
1. Clock, serial-in, serial-out
2. Clock, serial-in, LATCH, ENABLE , OUTn
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SD16729
3. OUTn
TEST CIRCUIT
For this test circuit, Topr=25C, VDD=VIH=3.3V/5V, VOUT=0.7V, VIL=0V, REXT=490, VL=3.0V, RL=60, CL=10.5pF.
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SD16729
TYPICAL APPLICATION CIRCUIT
VLED=3~4(V) + SCAN 21 3 4 2 ENABLE CLOCK LATCH OUT0 5 Vo +
Vds
-
SD16729P/SD16729S
OUT15 GND 1 SERIAL-OUT 22 20
Vf -
SERIAL-IN R-EXT 23
CPU
21 3 4 2
ENABLE CLOCK LATCH
OUT0
5
SD16729P/SD16729S
OUT15 GND 1 SERIAL-OUT 22 20
SERIAL-IN R-EXT 23
Note: this circuit and corresponding parameters are just for reference, please set the parameter according to practical circuit.
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SD16729
ELECTRICAL CHARACTERISTIC CURVE
IOUT is given by: IOUT= (VR-EXT /REXT)x15.2; VR-EXT=1.202V Where, VR-EXT is voltage of R-EXT, and REXT is the resistance of resistor connected to R-EXT.
Power dissipation (PD) Max. power dissipation is given by: PD(max)=(Tj-Ta)/Rth(j-a) and actual power dissipation when 16 channel are all ON is expressed as: PD(act)=(IDDx VDD)+(IOUT x Duty x VCE x16). Hence, to make PD(act) PD(max), output current and duty cycle should be: IOUT={[(Tj-Ta)/ Rth(j-a)]-(IDD x VDD) }/VCE/Duty/16, where Tj=150C.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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SD16729
All the parameters are just for reference, please test for your design.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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SD16729
PACKAGE OUTLINE
SSOP-24-225-0.635
0.25
UNIT: mm
0.250.05 0.30 0.635
8.650.20
SSOP-24-300-1.0
13.00.2
UNIT: mm
6.00.2
7.90.3
1.0
1.0
0.4
+0.1 0.2 -0.05
13.5MAX 0.1+0.1 1.80.2 -0.05 2.2MAX
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7.62
0.5250.2
2009.03.10 Page 12 of 14
SD16729
MOS DEVICES OPERATE NOTES:
Electrostatic charges may exist in many things. Please take following preventive measures to prevent effectively the MOS electric circuit as a result of the damage which is caused by discharge: * The operator must put on wrist strap which should be earthed to against electrostatic. * Equipment cases should be earthed. * All tools used during assembly, including soldering tools and solder baths, must be earthed. * MOS devices should be packed in antistatic/conductive containers for transportation.
Disclaimer: * Silan reserves the right to make changes to the information herein for the improvement of the design and performance without further notice! * All semiconductor products malfunction or fail with some probability under special conditions. When using Silan products in system design or complete machine manufacturing, it is the responsibility of the buyer to comply with the safety standards strictly and take essential measures to avoid situations in which a malfunction or failure of such Silan products could cause loss of body injury or damage to property. * Silan will supply the best possible product for customers!
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