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EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E

Data Sheet

Mar. 2011 Rev. 1. 5 BCD Semiconductor Manufacturing Limited

General Description

The AP3608E is an eight-channel constant current sink

with current match used for LED driver. It uses an

external resistor to set the current for eight LED strings

with an accuracy of ±1.5%. The full scale LED current

can be adjusted from 10mA to 100mA for each chan-

nel. The LED light can be adjusted by PWM dimming

function.

The device can keep working when LED opens with-

out damage. It features under voltage lockout protec-

tion and over temperature protection.

The AP3608E has four interface terminals (FB, SDB,

FBX and SDBX pins). The first two terminals allow

the device to work with a DC/DC converter to drive

LED arrays for good performance. And the other two

enable the device to be connected in parallel.

The AP3608E is available in QFN-4

×4-24, TSSOP-

20(EDP) and SOIC-20 packages.

Features

· Input Voltage Range: 4.2V to 5.5V

· Typical Output Current: 480mA (60mA/1V per

Channel)

· Maximum Output Current: 800mA (100mA/1.5V

per Channel)

· Current Match Accuracy: ±1.5%

· PWM Dimming Control

· Open LED Self-check and Protection

· Under Voltage Lockout Protection

· Over Temperature Protection

· FBX and SDBX Pins Enable Parallel Application

Applications

· Notebook

· LCD Display Modules

· LCD Monitor

· LCD TV

Figure 1. Package Types of AP3608E

QFN-4×4-24 TSSOP-20(EDP) SOIC-20

Summary of content (15 pages)

PAGE 1
Data Sheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH General Description Features The AP3608E is an eight-channel constant current sink with current match used for LED driver. It uses an external resistor to set the current for eight LED strings with an accuracy of ±1.5%. The full scale LED current can be adjusted from 10mA to 100mA for each channel. The LED light can be adjusted by PWM dimming function. · · · · · · · · · The device can keep working when LED opens without damage.
PAGE 2
Data Sheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E Pin Configuration FN Package (QFN-4×4-24) Pin 1 Dot by Marking CH2 CH3 CH4 PGND CH5 CH6 24 23 22 21 20 19 CH1 1 18 CH7 NC 2 17 CH8 NC 3 16 EN NC 4 15 VCC PWM 5 14 AGND NC 6 13 NC Exposed Pad 7 8 9 10 11 12 NC FBX ISET FB SDB SDBX G/M Package (TSSOP-20(EDP)/SOIC-20) CH1 1 20 EN CH2 2 19 VCC CH3 3 18 AGND CH4 4 17 SDBX PGND 5 16 SDB PGND 6 15 FB CH5 7 14 ISET CH6 8 13
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Data Sheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E Pin Description Pin Number QFN-4×4-24 TSSOP-20(EDP)/ SOIC-20 1, 24, 23, 22, 1, 2, 3, 4, 7, 8, 9, 10 20, 19, 18, 17 Pin Name Function CH1to CH8 White LED cathode connection pin. These pins should be connected to GND if not used 2 ,3 ,4, 6, 7, 13 12 NC No connection 5 11 PWM PWM dimming control pin. Adding a PWM signal to this pin to control LED dimming (see Figure 10 for detail dimming control mode).
PAGE 4
Data Sheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E Functional Block Diagram VCC GND 15 (19) EN 16 (20) 14, 21 (5, 6, 18) EN Logic Bandgap OTP UVLO Time Out EN STG (Short To GND) VREF 8 CH1...CH8 3V 8 (13) 100mV CH1...CH8 FBX 8 SDB 11 (16) EN COMP Max.(CH1...CH8) Min.(CH1...
PAGE 5
Data Sheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E Ordering Information AP3608E - Circuit Type G1: Green Package TR: Tape and Reel Blank: Tube FN: QFN-4×4-24 G: TSSOP-20(EDP) M: SOIC-20 Package Temperature Range Part Number Marking ID Packing Type QFN-4×4-24 AP3608EFNTR-G1 B3B Tape & Reel TSSOP-20(EDP) AP3608EGTR-G1 AP3608EG-G1 Tape & Reel AP3608EM-G1 AP3608EM-G1 Tube AP3608EMTR-G1 AP3608EM-G1 Tape & Reel -40 to 85oC SOIC-20 BCD Semiconductor's Pb-free pro
PAGE 6
Data Sheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E Recommended Operating Conditions Parameter Symbol Min Max Unit Input Voltage VCC 4.2 5.5 V Recommended PWM Dimming Frequency fPWM 0.1 25 kHz 10 25 10 65 10 110 -40 85 Full Scale Setting Current per Channel VCHX≥0.5V ICHX VCHX≥1V VCHX≥1.
PAGE 7
Data Sheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E Electrical Characteristics (Continued) Limits in standard typeface are guaranteed for VIN=VEN=5V, RISET=8kΩ,, TA=25oC, unless otherwise specified. Parameter Symbol Conditions Min Typ Max Unit Enable Section EN Pin High Level Threshold Voltage VIH_EN EN Pin Low Level Threshold Voltage VIL_EN 1.8 V 0.8 V PWM Dimming Section PWM High Level Threshold Voltage VIH_PWM PWM Low Level Threshold Voltage VIL_PWM 1.8 V 0.
PAGE 8
Data Sheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E Typical Performance Characteristics (Continued) VIN=VEN=5V, RISET=8kΩ,, TA=25oC, unless otherwise specified. 61.0 Current per Channel (mA) Current per Channel (mA) 61.0 60.5 60.0 59.5 59.0 4.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4 60.5 60.0 59.5 59.0 0.5 5.6 1.0 1.5 Input Voltage (V) 2.5 3.0 3.5 Figure 7. Current per Channel vs. Voltage per Channel Figure 6. Current per Channel vs. Input Voltage 0.
PAGE 9
Data Sheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E Function Description I CHX_MAX = K ⋅ ISET The AP3608E is designed for LED display application which contains eight well-matched current sinks to provide constant current through LED. The full scale LED current can be adjusted from 10mA to 100mA per channel with an external resistor. If there is some channel unused, the channel pin should be connected to ground. The LED bright dimming can be achieved through PWM dimming.
PAGE 10
Data Sheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E Function Description (Continued) 3. Open LED Self-Check and Protection The AP3608E can work with a DC/DC converter to achieve good performance, such as self-check and protection against open LED. The SDB pin and FB pin are the interface terminals for working with the DC/ DC converter. FB pin samples voltage of each channel, and outputs the lowest voltage of all strings to DC/DC converter.
PAGE 11
Data Sheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E Typical Application VLED VLED C LED CLED 10 * 4 10* 8 CH1 CH2 AP3608E VCC SDBX FBX FB FBX EN GND AP3608E EN VCC C IN2 0.1µF PWM ISET CH2 CH3 CH4 SDB SDBX FB CIN2 0.1µF CH1 CH8 SDB PWM ISET GND AP3608E Vcc 5.0V External AP3608E Vcc 5.
PAGE 12
Data Sheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E Mechanical Dimensions Unit: mm(inch) QFN-4x4-24 0.300(0.012) 0.200(0.008) 0.500(0.020) MIN BSC 3.900(0.154) 4.100(0.161) 0.500(0.020) N24 N19 N1 Pin 1 Dot by Marking 2.600(0.102) 2.800(0.110) 3.900(0.154) 4.100(0.161) N13 N7 0.700(0.028) 0.800(0.031) 0.000(0.000) 0.050(0.002) 0.180(0.007) 2.600(0.102) 0.300(0.012) 2.800(0.110) 0.153(0.006) 0.253(0.010) Mar. 2011 Rev. 1.
PAGE 13
Data Sheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E Mechanical Dimensions (Continued) TSSOP-20(EDP) Unit: mm(inch) 6.400(0.252) 6.600(0.260) 4.100(0.161) 4.300(0.169) 2.900(0.114) 3.100(0.122) 6.200(0.244) 6.600(0.260) EXPOSED PAD 4.300(0.169) 4.500(0.177) #1 PIN INDEX0.750(0.030)Dp0.000(0.000) 0.850(0.033) 0.100(0.004) 0.100(0.004) 0.190(0.007) 0.650(0.026)TYP 0.900(0.035) 1.050(0.041) 0.340(0.013) 0.540(0.021) 1.200(0.047) MAX 0.050(0.002) 0.150(0.
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Data Sheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E Mechanical Dimensions (Continued) SOIC-20 Unit: mm(inch) Note: Eject hole, oriented hole and mold mark is optional. Mar. 2011 Rev. 1.
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BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE IMPORTANT NOTICE BCD Semiconductor BCD Semiconductor Manufacturing Manufacturing Limited Limited reserves reserves the the right right to to make make changes changes without without further further notice notice to to any any products products or or specifispecifications herein. cations herein.