AW3640 February 2018 V1.2 200mA 1-Wire Configurable Front Flash LED Driver with Ultra Small Package FEATURES GENERAL DESCRIPTION Front Flash LED Driving 200mA Maximum Flash Current 16 Steps Current 1-wire Pulse Configurable, 12.5mA/step LED Current Accuracy: 15% Low Dropout Voltage: 65mV@200mA (Typ.) AW3640 is a low voltage-drop current sink LED driver, which supports both Torch and Flash modes. The current-regulation sink integrated in the chip make the LED current capable of keeping constant when input voltage, LED forward voltage or temperature changing. The LED current can be adjusted among 16 steps by sending 1-wire pulse into the EN pin, and the maximum value is 200mA. Efficiency: 94% (VIN=3.6V, VF=3.4V) Shutdown Current: <0.1A Ultra Small 1.5x1.0x0.55mm3 DFN-6L Package AW3640 is available in an ultra small 1.5mmx 1.0mmx0.55mm DFN-6L package. And only one multi-layer ceramic capacitor is needed for the peripheral of the solution. APPLICATION In shut down mode, AW3640 turns off all internal circuit and the consumption is less than 0.1A. Front Camera Flash The device requires 2.8V~5.5V input voltage range and an operating temperature range of -40~85. LED Torch Mode TYPICAL APPLICATION CIRCUIT Battery + _ 4 1uF VIN AW3640 GPIO 1 2 6 ILED EN 2 n16 GND 1,3 Figure 1 AW3640 Application Circuit for Single LED All the trademarks mentioned in the document are the property of their owners. www.awinic.com.cn 1 Copyright (c) 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW3640 February 2018 V1.2 PIN CONFIGURATION AND TOP MARK AW3640 TOP VIEW AW3640 MARKING 1 6 EN ILED 2 5 NC GND 3 4 VIN DXX GND D ---- AW3640DNR XX ---- Manufacture trace code PIN DEFINITION No. NAME 1 GND Ground. 2 ILED Open drain current sink pin, connected to LED cathode. 3 GND Ground. 4 VIN Power Supply (2.8V-5.5V) 5 NC Not connected. 6 EN Enable pin. LED current can be adjusted by sending 1-wire pulse into this pin. www.awinic.com.cn DESCRIPTION 2 Copyright (c) 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW3640 February 2018 V1.2 ORDERING INFORMATION Part Number Package Moisture Sensitivity Level Environmental Information Marking Delivery Form 1.5mmx1.0mm DFN-6L MSL3 ROHS+HF DXX Tape and Reel 3000pcs/Reel Temperature AW3640 DNR -4085 AW3640 Shipping R: Tape & Reel Package Type DN: DFN TYPICAL APPLICATION CIRCUITS Battery + _ 4 1uF VIN AW3640 GPIO 1 6 ILED EN 2 n16 2 GND 1,3 Figure 2 AW3640 Application Circuit for Single LED Battery + _ 1uF 4 4 VIN VIN AW3640 GPIO1 1 2 6 AW3640 ILED EN GPIO2 2 n16 1 2 6 ILED EN 2 n16 GND GND 1,3 1,3 Figure 3 AW3640 Application Circuit for Dual LEDs www.awinic.com.cn 3 Copyright (c) 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW3640 February 2018 V1.2 ABSOLUTE MAXIMUM RATINGS(NOTE1) PARAMETERS Range Unit -0.3 to 6 V -0.3 to (VIN+0.3) V 125 -65 to 150 260 148.2 /W HBM 8000 V MM 300 V CDM 1000 V VIN, ILED EN Max Junction Temperature TJMAX Storage Temperature TSTG Maximum lead temperature (soldering) Junction to Ambient Thermal Resistance JA ESD, All Pins(NOTE2) +IT+450 Latch-Up JEDEC STANDARD NO.78B DECEMBER 2008 -IT-450 mA RECOMMENDED OPERATING CONDITIONS PARAMETERS Range Unit VIN 2.8 to 5.5 V Junction temperature (TJ) -40 to 125 Ambient temperature (TA) -40 to 85 NOTE1: Conditions out of those ranges listed in "absolute maximum ratings" may cause permanent damages to the device. In spite of the limits above, functional operation conditions of the device should within the ranges listed in "recommended operating conditions". Exposure to absolute-maximum-rated conditions for prolonged periods may affect device reliability. NOTE2: The human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin. Test method: MIL-STD-883G Method 3015.7 www.awinic.com.cn 4 Copyright (c) 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW3640 February 2018 V1.2 ELECTRICAL CHARACTERISTICS VBAT=3.8V, TA=25 for typical values (unless otherwise noted) Symbol Description Test Conditions Min Typ. Max Units 5.5 V 1 A Power supply VIN Input operation voltage 2.8 ISHUTDOWN Current in Shutdown mode EN=0 0.1 IQ Quiescent Current in Active mode EN=1, ILED floating 255 A Digital Logical Interface VIL Logic input low level VIH Logic input high level REN Pull down resistor inside 0.4 1.3 V V 100 k 1-Wire Dimming Pulse Timing TLO EN pulse low time 0.5 THI EN pulse high time 0.5 TSHDN Chip shutdown delay Measure from EN falling edge to the chip entering shutdown mode 0.8 ILED Current accuracy ILED=200mA 170 VDROP Dropout voltage ILED=200mA 500 s s 2.5 ms 200 230 mA 65 100 mV LED Driver www.awinic.com.cn 5 Copyright (c) 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW3640 February 2018 V1.2 FUNCTIONAL BLOCK DIAGRAM ILED VIN 4 2 CURRENT REFERENCE CURRENT SINK NC 5 EN 6 CURRENT ADC DEGLITCH 1,3 GND Figure 4 AW3640 Functional Block www.awinic.com.cn 6 Copyright (c) 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW3640 February 2018 V1.2 TYPICAL CHARACTERISTICS Figure 5 Figure 7 www.awinic.com.cn Quiescent Current vs. Input Voltage LED Current vs. Temperature Figure 6 Figure 8 7 LED Current vs. ILED pin Voltage LED Current vs. 1-Wire Dimming Step Copyright (c) 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW3640 February 2018 V1.2 DETAILED DESCRIPTION AW3640 is a low voltage-drop current sink LED driver, which supports both Torch and Flash modes. The current-regulation sink integrated in the chip make the LED current capable of keeping constant when input voltage, LED forward voltage or temperature changing. The LED current can be adjusted among 16 steps by sending 1-wire pulse into the EN pin, and the maximum value is 200mA. ENABLE CONTROL The voltage level at EN pin determines the operation state of the chip. When the EN pin is set to high, AW3640 operates in normal state. And the chip would enter shutdown mode if the EN pin is set to low for over 2.5ms, as a built-in shutdown delay circuit in AW3640. The shutdown current dissipated by AW3640 is less than 0.1A. GLITCH ELIMINATION AW3640 built in deglitch circuit. The interference between signals inside the portable device is unavoidable, thus deglitch circuit is necessary at the EN pin. The deglitch circuit inside AW3640 is capable of eliminating the glitch which is narrower than 80ns, preventing the incorrect trigger at the EN pin effectively. APPLICATION INFORMATION 1-WIRE PULSE DIMMING AW3640 adopts the 1-wire pulse dimming to avoid the switch noise. A 4-bit DAC inside AW3640 allows counting the rising edge at the EN pin to set the LED current (refer to Figure 5 and Table 1). Figure 5 shows that the first high level hold time TON should be over 20s to make sure the chip start up regularly, and meantime setting the LED current to the maximum value. Other EN pulse timing requirements include normal high level time THI should longer than 0.5s, and low level time TLO should between 0.5s and 500s. 20us<TON EN 1 16/16 0.5us<THI 0.5us<TLO <500us 2 15/16 3 14/16 5 4 2.5ms<TSHDN 6 15 16 1 16/16 13/16 12/16 3/16 ILED 2/16 1/16 Figure 9 AW3640 1-wire dimming timing diagram The LED current steps down along with the increasing EN pulse rising edge number as shown in table 1. After the current set process, the EN pin should set to high level. www.awinic.com.cn 8 Copyright (c) 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW3640 February 2018 V1.2 Table 1 LED Current vs. EN Rising Edge Number EN Rising Edge Number LED Current (mA) EN Rising Edge Number LED Current (mA) 1 200 9 100 2 187.5 10 87.5 3 175 11 75 4 162.5 12 62.5 5 150 13 50 6 137.5 14 37.5 7 125 15 25 8 112.5 16 12.5 EFFICIENCY AW3640 is a low voltage-drop current sink LED driver, its operation efficiency can be approximately calculated as below. POUT VF I OUT VF I OUT VF PIN VIN I IN VIN I OUT VIN VF in the formula represents the forward voltage of LED. If VIN is 3.6V, VF is 3.4V, the chip efficiency is about 94%. PCB LAYOUT CONSIDERATION To make fully use of the performance of AW3640, the guidelines below should be followed. 1 All the peripherals should be placed as close to the device as possible. Place the input capacitor CIN on the top layer (same layer as the AW3640) and close to VIN (pin4). 2 Route the power line (shown in Figure 2) as widely and shortly as possible to reduce parasitic impedance. 3 To optimize the heat dissipation performance, the GND pins (pin1 & 3) should be connected to the PCB ground plane using as many vias as possible. www.awinic.com.cn 9 Copyright (c) 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW3640 February 2018 V1.2 TAPE AND REEL INFORMATION CARRIER TAPE PIN1 Pin 1 User Direction of Feed www.awinic.com.cn 10 Copyright (c) 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW3640 February 2018 V1.2 REEL NOTE: 1 ALL DIMS IN mm; 2 General Tolerance 0.25mm. www.awinic.com.cn 11 Copyright (c) 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW3640 February 2018 V1.2 PACKAGE INFORMATION SYMBOL A A1 A3 b b1 D E e k k1 L L1 www.awinic.com.cn 12 Dimensions in Millimeters Min. Max. 0.500 0.600 0.000 0.050 0.152REF. 0.150 0.250 0.150REF. 0.900 1.100 1.400 1.600 0.500BSC. 0.300REF. 0.250REF. 0.300 0.400 0.350 0.450 Dimensions in Inches Min. Max. 0.020 0.024 0.000 0.002 0.006REF. 0.006 0.010 0.006REF. 0.035 0.043 0.055 0.063 0.020BSC. 0.012REF. 0.010REF. 0.012 0.016 0.014 0.018 Copyright (c) 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW3640 February 2018 V1.2 LAND PATTERN EXAMPLE 0.26 1.26 0.5 0.3 0.5 NOTE: Dimensions are in millimeters. www.awinic.com.cn 13 Copyright (c) 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW3640 February 2018 V1.2 REFLOW Figure 10 Package Reflow Oven Thermal Profile Reflow Note Spec Average ramp-up rate (217c to Peak) Max. 3/sec Time of Preheat temp.(from 150 to 200) 60-120sec Time to be maintained above 217 60-150sec Peak Temperature 250-260 Time within 5 of actual peak temp 20-40sec. Ramp-down rate Max. 6/sec Time from 25 to peak temp Max. 8min. www.awinic.com.cn 14 Copyright (c) 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW3640 February 2018 V1.2 REVISION HISTORY Vision Date Change Record V0.9 July 2016 Datasheet V0.9 Released V1.0 October 2016 Datasheet V1.0 Released V1.1 January 2017 1. Added Tape and Reel information; 2. Added RoHS and MSL statements. 3. Added Land pattern example. V1.2 February 2018 1. Updated Ordering Information table; 2. Deleted Page1 Chinese content. www.awinic.com.cn 15 Copyright (c) 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW3640 February 2018 V1.2 DISCLAIMER Information in this document is believed to be accurate and reliable. However, Shanghai AWINIC Technology Co., Ltd (AWINIC Technology) does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information. AWINIC Technology reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice. Customers shall obtain the latest relevant information before placing orders and shall verify that such information is current and complete. This document supersedes and replaces all information supplied prior to the publication hereof. AWINIC Technology products are not designed, authorized or warranted to be suitable for use in medical, military, aircraft, space or life support equipment, nor in applications where failure or malfunction of an AWINIC Technology product can reasonably be expected to result in personal injury, death or severe property or environmental damage. AWINIC Technology accepts no liability for inclusion and/or use of AWINIC Technology products in such equipment or applications and therefore such inclusion and/or use is at the customer's own risk. Applications that are described herein for any of these products are for illustrative purposes only. AWINIC Technology makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. All products are sold subject to the general terms and conditions of commercial sale supplied at the time of order acknowledgement. Nothing in this document may be interpreted or construed as an offer to sell products that is open for acceptance or the grant, conveyance or implication of any license under any copyrights, patents or other industrial or intellectual property rights. Reproduction of AWINIC information in AWINIC data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. AWINIC is not responsible or liable for such altered documentation. Information of third parties may be subject to additional restrictions. Resale of AWINIC components or services with statements different from or beyond the parameters stated by AWINIC for that component or service voids all express and any implied warranties for the associated AWINIC component or service and is an unfair and deceptive business practice. AWINIC is not responsible or liable for any such statements. www.awinic.com.cn 16 Copyright (c) 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD