AW36515FCR

AW36515 Oct. 2019 V1.1 High Efficiency, Dual Independent 2A Flash LED Driver Features General Description  Dual Independent and Programmable 2A LED Current Source  Flash：3.91mA~2.0A，256 levels 7.83mA/level  Torch： 0.98mA~500mA，256 levels 1.96mA/level  Flash Timeout：40ms~1.6s，16 levels  Flash/Torch/IR Mode The AW36515 is a dual LED flash driver that provides a high level of adjustability within a small solution size. The AW36515 utilizes a 2MHz or 4MHz fixed-frequency synchronous boost converter to provide power to the dual 2A constant current LED sources. The dual 256 levels current sources provide the flexibility to adjust the current of LED1 and LED2 in Flash/Torch/IR modes. The AW36515 provides IVFM protection to prevent system reset or shutdown under low battery condition.  Up to 85% Flash Efficiency  Optimized Flash LED Current During Low Battery Conditions (IVFM)  Hardware Flash/Torch Enable (STROBE/TORCH) The AW36515 are controlled via an I2C compatible interface. The main features of the AW36515 include: flash/torch current, flash timeout duration, IVFM and TX interrupt. The AW36515 also provides hardware flash/torch pin (STROBE/TORCH) to control Flash/Torch events.  Synchronization Input for RF Power Amplifier Pulse Events (TX) e  400kHz I2C：AW36515 (I2C Address=0x63)  0.4mm Pitch，FCQFN-10L Package Compatible with AW3643, AW3644, AW36413 d i f n The 2MHz or 4MHz switching frequency options, overvoltage protection (OVP), and adjustable current limit allow for the use of tiny, low-profile inductors and 10-µF ceramic capacitors. The device operates over a –40°C to +85°C ambient temperature range. o Application C Smartphone Camera Flash ic in w a i t n The AW36515 is available in small 0.4mm pitch FCQFN 1.6mm×1.2mm -10L package. Typical Application Circuit A L 1μH 3A VIN CIN 10μF IN SW OUT COUT 10μF AW36515FCR LED1 STROBE/TORCH TX SDA SCL MCU Flash LED D1 LED2 GND Flash LED D2 Typical Application Circuit of AW36515 All trademarks are the property of their respective owners. www.awinic.com.cn 1 l Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Pin Configuration And Top Mark AW36515FCR Pin Configuration (Top View) A GND B SW SCL C OUT STROBE/ TORCH D LED2 TX LED1 1 2 3 IN AW36515FCR Top Mark (Top View) SDA VSDS XXX a i t n e d i f VSDS – AW36515FCR XXX – Production Tracing Code n o Pin Configuration and Top Mark Pin Definition ic in w No. C NAME TYPE GND Ground Ground IN Power Input voltage connection. Connect IN to GND with a 10µF or larger ceramic capacitor. A SDA I/O Serial data input/output of the I2C interface. SW Power Switch pin of the step-up DC-DC convertor. B3 SCL I/O C1 OUT Power Step-up DC-DC converter output. Connect a 10µF ceramic capacitor between OUT and GND. C3 STROBE/TORCH I/O Active high hardware flash/torch/IR enable. Drive STROBE/TORCH high to turn on Flash/Torch/IR pulse. Internal pull down resistor of 300kΩ between STROBE/TORCH and GND. D1 LED2 Power D2 TX I/O D3 LED1 Power A1 A2 A3 B1 www.awinic.com.cn DESCRIPTION Serial clock input of the I2C interface. High-side current source output for flash LED2. Power amplifier synchronization input. Internal pull down resistor of 300kΩ between TX and GND. High-side current source output for flash LED1. 2 l Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Ordering Information Part Number Temperature Package Marking Moisture Sensitivity Level Environmental Information Delivery Form AW36515FCR -40°C~85°C FCQFN 1.6mmX1.2mm -10L VSDS MSL1 ROHS+HF 3000 units/ Tape and Reel AWINIC Flash LED Driver Series Channels Type Description AW36515 2 Boost High Efficiency, Dual Independent 2A Flash LED Driver FCQFN-10L AW3644 2 Boost High Efficiency, Dual Independent 1.5A Flash LED Driver CSP-12B AW3643 2 Boost High Efficiency, Dual 1.5A Flash LED Driver CSP-12B AW36413 2 Boost High Efficiency, Dual 1.5A Flash LED Driver AW3648 1 Boost High Efficiency, 1.5A Flash LED Driver AW3642 1 Boost High Efficiency, 1.5A Flash LED Driver CSP-9B AW3641E 1 Charge Pump Flash Current & Flash Timer Programmable 1A Flash LED Driver DFN-10L AW36402 1 Current Sink 200mA 1-wire Configurable Front Flash LED Driver with Ultra Small Package DFN-6L AW36404 1 Current Sink 400mA 1-wire Configurable Front Flash LED Driver with Ultra Small Package DFN-8L AW36406 1 Current Sink 600mA PWM Configurable Front Flash LED Driver with Ultra Small Package DFN-8L ic in w A www.awinic.com.cn Package e n o C 3 d i f l a i t n Product CSP-12B CSP-12B Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Typical Application Circuits L 1μH 3A VIN CIN 10μF IN SW OUT COUT 10μF AW36515FCR LED1 STROBE/TORCH TX SDA SCL MCU Flash LED D1 LED2 GND Flash LED D2 l a i t n AW36515 Application Circuit Notice for Typical Application Circuits: 1: Please place CIN，COUT as close to the chip as possible. e d i f 2: Connect the inductor on the top layer close to the SW pin. 3: For the sake of driving capability, the power lines, output lines, and the connection lines of L and LED should be short and wide as possible. 4: n Traces carry high current are marked in red in the above figure. o ic in w C A www.awinic.com.cn 4 Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Absolute Maximum Ratings(NOTE1) PARAMETERS Range Unit -0.3 to 6 V SCL, SDA, STROBE/TORCH, TX −0.3 to (VIN+0.3) V Continuous power dissipation Internally limited IN, SW, OUT, LED1, LED2 Max Junction Temperature TJMAX 155 °C -65 to 150 °C Maximum lead temperature (soldering) 260 °C Junction to Ambient Thermal Resistance θJA 92 °C /W HBM ±2000 V CDM ±1500 Storage Temperature TSTG ESD, All Pins(NOTE2) -IT： -200 d i f VIN Junction temperature (TJ) ic in w Ambient temperature (TA) n o PARAMETERS C mA e Recommended Operating Conditions Range Unit 2.7 to 5.5 V -40 to 125 °C -40 to 85 °C 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. A NOTE2: The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin. Test method: ANSI/ESDA/JEDEC JS-001. CDM test method: JEDEC22-C101E. www.awinic.com.cn 5 l a i t n +IT：+200 Latch-Up (Test method: JEDEC STANDARD NO.78D) V Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Electrical Characteristics Typical values tested at TA=25°C. Minimum and maximum limits apply over the full operating ambient temperature range(-40°C≤TA≤85°C). Unless otherwise specified, VIN=3.6V. Symbol Description Test Condition Min Typ Max Unit 5.5 V 0.4 0.8 mA 3 10 A Vin Supply VIN Input operating range 2.7 IQ Quiescent supply current Device not switching, pass mode ISB Standby supply current Device disabled, 2.7V≤VIN≤5.5V,SCL=SDA=0V UVLO Under voltage lockout threshold Falling VIN 2.5 Rising VIN 2.6 ILED1/2 VOUT over-voltage protect threshold VOVP Boost Converter Specifications ic in w RPMOS RNMOS ICL A FSW VIVFM PMOS switch on-resistance n ON threshold o OFF threshold C e A 249 10% mA 4.85 5 5.15 4.75 4.9 5.05 -10% NMOS switch on-resistance 2.0 V 7% d i f Current source accuracy VOUT=4V, torch code=0x7F=249mA -7% V 90 mΩ 70 mΩ Reg 0x07, bit[0]=0 -12% 1.9 12% Reg 0x07, bit[0]=1 -12% 2.8 12% Reg 0x07, bit[1]=0 -6% 2 6% Reg 0x07, bit[1]=1 -6% 4 6% Reg 0x02, bits[5:3]=”000” -3% 2.9 3% Switch current limit A Switching frequency Input voltage flash monitor trip threshold MHz Thermal shutdown threshold 155 Thermal shutdown hysteresis 20 TSD V °C www.awinic.com.cn 6 l a i t n Current Source Specifications VOUT=4V, flash code=0xFF=2.0A V Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Electrical Characteristics(continued) Typical values tested at TA=25°C. Minimum and maximum limits apply over the full operating ambient temperature range(-40°C≤TA≤85°C). Unless otherwise specified, VIN=3.6V. Symbol Description Test Condition Min Typ Max Unit I2C-Compatible Interface Specifications(SCL,SDA) VIL Input logic low 0 0.4 V VIH Input logic high 1.2 VIN V VOL Output logic low 0.4 V 0.4 V ILOAD=3mA STROBE/TORCH, TX Voltage Specifications VIL Input logic low 0 VIH Input logic high 1.2 RPD Internal pull down resistors 300 V kΩ e n o ic in w C d i f A www.awinic.com.cn 7 l a i t n VIN Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 I2C Interface Timing Symbol Min Description FSCL Interface Clock frequency TDEGLITCH Deglitch time Typ Max Units 400 kHz SCL 200 ns SDA 250 ns THD:STA (Repeat-start) Start condition hold time 0.6 s TLOW Low level width of SCL 1.3 s THIGH High level width of SCL 0.6 s TSU:STA (Repeat-start) Start condition setup time 0.6 THD:DAT Data hold time 0 TSU:DAT Data setup time 0.1 TR Rising time of SDA and SCL TF Falling time of SDA and SCL TSU:STO Stop condition setup time TBUF Time between start and stop condition ic in w SDA tBUF tLOW tR o C tHIGH s e d i f n s 0.3 s 0.3 s 0.6 s 1.3 s VIH VIL tSP tF VIH SCL Stop A www.awinic.com.cn Start tHD:STA VIL tHD:DAT tSU:DAT tSU:STA Start tSU:STO Stop I2C INTERFACE TIMING 8 l a i t n s Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Typical Characteristics 2.2 2.2 2 2 1.8 1.8 1.6 1.6 1.4 1.4 ILED2 (A) ILED1 (A) Ambient temperature is 25°C, input voltage is 3.6 V, CIN = COUT = 2×10 µF and L=1 µH, unless otherwise noted . 1.2 1 0.8 0.6 0.6 0.4 0.4 0.2 0.2 0 0.52 0.48 0.44 0.4 0.36 0.32 0.28 0.24 0.2 0.16 0.12 0.08 0.04 0 32 64 96 128 160 224 256 0 32 64 96 128 192 224 LED2 Flash Code (dec#) LED1 Flash Current vs Brightness Code LED2 Flash Current vs Brightness Code ic in w 32 64 96 128 160 192 C 224 d i f n 256 0 32 64 96 128 160 192 224 LED1 Torch Code (dec#) LED2 Torch Code (dec#) LED1 Torch Current vs Brightness Code LED2 Torch Current vs Brightness Code A 256 e 0.52 0.48 0.44 0.4 0.36 0.32 0.28 0.24 0.2 0.16 0.12 0.08 0.04 0 2.1 BRC=0 256 BRC=127 2 BRC=31 1.9 BRC=159 BRC=47 0.7 1.8 BRC=175 BRC=63 BRC=191 0.6 BRC=79 1.7 1.6 BRC=207 0.5 BRC=111 0.8 ILED1 (A) BRC=15 0.9 BRC=95 0.4 BRC=143 BRC=223 1.5 BRC=239 1.4 BRC=255 1.3 0.3 1.2 0.2 1.1 0.1 1 0 2.5 3 3.5 4 4.5 5 5.5 0.9 2.5 3 3.5 4 4.5 5 VIN(V) VIN(V) LED1 Flash Current vs Input Voltage LED1 Flash Current vs Input Voltage www.awinic.com.cn 9 l a i t n 160 LED1 Flash Code (dec#) o 0 1 192 ILED2 (A) 0 ILED1 (A) 1 0.8 0 ILED1 (A) 1.2 5.5 Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Typical Characteristics (continued) Ambient temperature is 25°C, input voltage is 3.6 V, CIN = COUT = 2×10 µF and L=1 µH, unless otherwise noted . 1 BRC=31 1.9 BRC=159 BRC=47 0.7 1.8 BRC=175 BRC=63 BRC=191 0.6 BRC=79 1.7 1.6 BRC=207 0.5 BRC=111 ILED2 (A) 2 0.8 BRC=95 0.4 BRC=143 BRC=223 1.5 BRC=239 1.4 BRC=255 1.3 0.3 1.2 0.2 1.1 0.1 1 0 2.5 3 3.5 4 4.5 5 0.9 5.5 2.5 1.60 1.56 d i f 1.54 ILED (A) 1.70 1.50 ic in w 3 3.5 4 4.5 VIN (V) fSW=2MHz ILED=2.0A C 5 1.52 1.50 1.48 1.46 1.42 1.40 2.5 LED1 LED2 ILED (A) ILED (A) 0.79 0.77 0.75 0.73 0.71 0.69 0.67 3.5 ILED=0.747A 4 VIN (V) fSW=2MHz 4.5 5 Flash LED1 & LED2 Current vs Input Voltage www.awinic.com.cn 10 4 4.5 VIN (V) fSW=2MHz 5 5.5 Flash LED1/2 Flash Current vs Input Voltage 0.81 3 3.5 ILED=1.5A LED1/2 Flash Current vs Input Voltage 2.5 3 Flash A a i t n 1.44 5.5 5.5 1.12 1.08 1.04 1.00 0.96 0.92 0.88 0.84 0.80 0.76 0.72 0.68 0.64 0.60 LED1 LED2 2.5 3 3.5 ILED=1.006A 4 VIN (V) fSW=2MHz l 5.5 n o 1.60 2.5 5 e 1.58 1.40 4.5 LED2 Flash Current vs Input Voltage 1.80 0.83 4 LED2 Flash Current vs Input Voltage 1.90 0.85 3.5 VIN(V) 2.00 0.87 3 VIN(V) 2.10 ILED (A) BRC=127 BRC=15 0.9 ILED2 (A) 2.1 BRC=0 4.5 5 5.5 Flash LED1 & LED2 Current vs Input Voltage Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Typical Characteristics (continued) 0.55 0.55 0.54 0.54 0.53 0.53 0.52 0.52 0.51 0.51 ILED (A) ILED (A) Ambient temperature is 25°C, input voltage is 3.6 V, CIN = COUT = 2×10 µF and L=1 µH, unless otherwise noted . 0.5 0.49 0.5 0.49 0.48 0.48 0.47 0.47 0.46 0.46 0.45 0.45 2.5 3 3.5 ILED=0.5A 4 4.5 VIN(V) fsw=2MHz 5 2.5 5.5 3 0.3 0.29 0.28 0.28 0.27 0.27 0.26 0.26 ILED (A) ILED (A) 0.3 0.29 0.25 0.24 0.22 3 3.5 4 4.5 ic in w ILED=0.25A VIN(V) fsw=2MHz Torch C 5 5.5 a i t n d i f 0.25 0.24 0.23 0.22 0.21 0.2 2.5 3 3.5 ILED=0.25A 4 4.5 VIN(V) fsw=4MHz 5 5.5 Torch LED1/2 Torch Current vs Input Voltage LED1 LED1 0.29 LED2 LED2 0.28 0.52 0.27 0.51 0.26 ILED1 (A) ILED (A) 0.53 l Torch 0.3 A 0.54 5.5 e LED1/2 Torch Current vs Input Voltage 0.55 5 n o 0.23 2.5 4.5 LED1/2 Torch Current vs Input Voltage LED1/2 Torch Current vs Input Voltage 0.2 4 VIN(V) fsw=4MHz ILED=0.5A Torch 0.21 3.5 0.5 0.49 0.25 0.24 0.48 0.23 0.47 0.22 0.46 0.21 0.2 0.45 2.5 3 3.5 ILED=0.5A 4 VIN (V) fsw=2MHz 4.5 5 2.5 3 3.5 ILED=0.25A Torch LED1&2 Torch Current vs Input Voltage www.awinic.com.cn 5.5 11 4 VIN(V) fsw=2MHz 4.5 5 5.5 Torch LED1&2 Torch Current vs Input Voltage Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Typical Characteristics (continued) Ambient temperature is 25°C, input voltage is 3.6 V, CIN = COUT = 2×10 µF and L=1 µH, unless otherwise noted . 100 100 VLED=3.3V 95 VLED=3.5V VLED=3.6V 90 90 VLED=3.7V 85 VLED=4.1V 80 ηLED (%) ηLED (%) VLED=3.8V VLED=4.4V 70 80 75 70 65 60 60 55 50 50 2.5 3 3.5 4 4.5 5 2.5 5.5 3.0 3.5 VIN (V) ILED=2.0A fSW=2MHz Flash ILED=2.0A 100 95 95 90 90 85 85 80 75 o 70 ic in w 55 50 2.5 3.0 ILED=1.5A 3.5 4.0 4.5 VIN (V) VLED=3.5V fSW=2MHz C a i t n Flash 5.0 75 70 65 60 55 50 5.5 2.5 Flash 3.0 ILED=1.5A 3.5 4.0 4.5 VIN (V) VLED=3.5V fSW=4MHz 5.0 5.5 Flash LED Efficiency vs Input Voltage A 100 95 95 90 90 85 85 80 80 ηLED (%) ηLED (%) VIN (V) VLED=3.6V fSW=2MHz d i f 80 75 70 75 70 65 65 60 60 55 55 50 50 2.5 3.0 ILED=0.5A 3.5 4.0 4.5 5.0 VIN (V) VLED=3.1V fSW=2MHz Torch LED Efficiency vs Input Voltage www.awinic.com.cn 12 5.5 2.5 3.0 ILED=0.25A 3.5 l 5.5 e LED Efficiency vs Input Voltage 100 5.0 n ηLED (%) ηLED (%) 100 60 4.5 LED Efficiency vs Input Voltage LED Efficiency vs Input Voltage 65 4.0 4.0 4.5 5.0 VIN (V) VLED=3.0V fSW=2MHz 5.5 Torch LED Efficiency vs Input Voltage Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Typical Characteristics (continued) 2.150 4.300 2.125 4.250 2.100 4.200 2.075 4.150 2.050 4.100 fSW (Mhz) fSW (Mhz) Ambient temperature is 25°C, input voltage is 3.6 V, CIN = COUT = 2×10 µF and L=1 µH, unless otherwise noted . 2.025 2.000 4.000 1.975 3.950 1.950 3.900 1.925 3.850 1.900 2.5 2.75 3 3.25 3.5 3.75 4 4.25 4.5 4.75 3.800 5 2.5 2.75 6 d i f ISTB (μA) n o 1.0 0.5 ic in w 3 3.5 4 4.5 C 5 5 e 5 1.5 4 3 2 1 0 5.5 2.5 3 3.5 4 4.5 5 VIN (V) I2C=0V VIN (V) I2C=1.8V Standby Current vs Input Voltage Standby Current vs Input Voltage A 5 4.25 4.5 4.75 4-MHz Frequency vs Input Voltage 2.5 5.5 3.0 2.5 4 ISTB (μA) ISTB (μA) 2.0 3 2 1.5 1.0 1 0.5 0 0.0 2.5 3 3.5 4 4.5 5 5.5 2.5 3 3.5 4 4.5 5 VIN (V) I2C=3.3V VIN (V) I2C=VIN Standby Current vs Input Voltage Standby Current vs Input Voltage www.awinic.com.cn 13 l a i t n 4 2-MHz Frequency vs Input Voltage 7 2.5 3.25 3.5 3.75 VIN (V) 3.0 0.0 3 VIN (V) 2.0 ISTB (μA) 4.050 5.5 Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Typical Characteristics (continued) 2.20 2.16 2.12 2.08 2.04 2.00 1.96 1.92 1.88 1.84 1.80 1.76 1.72 1.68 1.64 1.60 ICL (A) ICL (A) Ambient temperature is 25°C, input voltage is 3.6 V, CIN = COUT = 2×10 µF and L=1 µH, unless otherwise noted . 2.5 2.7 2.9 3.1 ILED=1.5A 3.3 3.5 3.7 3.9 VIN (V) fSW=2MHz ICL=1.9A 4.1 2.20 2.16 2.12 2.08 2.04 2.00 1.96 1.92 1.88 1.84 1.80 1.76 1.72 1.68 1.64 1.60 4.3 2.5 2.7 VLED=4.5V 2.8 2.8 2.6 o 2.4 ic in w 2.8 3.1 ILED=2.0A 3.4 3.7 4 4.3 VIN (V) fSW=2MHz ICL=2.8A 4.6 C 4.9 5.2 5.5 d i f 2.6 VOUT(2V/DIV) IIN(1A/DIV) a i t n VLED=4.5V 2.0 2.5 2.8 3.1 ILED=2.0A 3.4 3.7 4 4.3 VIN (V) fSW=4MHz ICL=2.8A 4.6 4.9 5.2 5.5 VLED=4.5V Inductor Current Limit vs Input Voltage VOUT(2V/DIV) IIN(1A/DIV) ILED(500mA/DIV) ILED1/2=1.5A fSW=2MHz VLED=3.4V Ramp Down 14 l 4.3 TIME (500 μs/DIV) VLED=3.4V Ramp Up www.awinic.com.cn 4.1 2.2 TIME (500 μs/DIV) fSW=2MHz 3.9 2.4 VLED=4.5V ILED(500mA/DIV) ILED1/2=1.5A 3.7 e Inductor Current Limit vs Input Voltage A 3.5 VIN (V) fSW=4MHz ICL=1.9A n ICL (A) ICL (A) 3.0 2.5 3.3 Inductor Current Limit vs Input Voltage 3.0 2.0 3.1 ILED=1.5A Inductor Current Limit vs Input Voltage 2.2 2.9 Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Typical Characteristics (continued) Ambient temperature is 25°C, input voltage is 3.6 V, CIN = COUT = 2×10 µF and L=1 µH, unless otherwise noted . VIN (100mV/DIV) TX signal VOUT(2V/DIV) IIN (500mA/DIV) IIN(800mA/DIV) ILED (200mA/DIV) ILED(500mA/DIV) ILED1=ILED2=747mA fSW=2MHz ILED1=ILED2=747mA VLED=3.18V fSW=2MHz VLED=3.18V VIVFM=2.9V IVFM - Stop and Hold TX Interrupt e n o ic in w C d i f A www.awinic.com.cn 15 l a i t n TIME (500 μs/DIV) TIME (2 ms/DIV) Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Detailed Functional Description The AW36515 is a high-power LED flash driver capable of delivering up to 2A in either of the two parallel LEDs. The device incorporates a 2MHz or 4MHz constant frequency-synchronous current-mode PWM boost converter and dual high-side current sources to regulate the LED current over the 2.7V to 5.5V input voltage range. The AW36515 PWM DC-DC boost converter switches and boosts the output to maintain at least VHR across each of the current sources (LED1/2). This minimum headroom voltage ensures that both current sources remain in regulation. If the input voltage is above the LED voltage + current source headroom voltage, the device would not switch, but turn the PMOS on continuously (Pass mode). In Pass mode the difference between (VIN − ILED × RPMOS) and the voltage across the LED is dropped across the current source. The AW36515 has two logic inputs including a reusable hardware Flash/Torch Enable (STROBE/TORCH) and a Flash Interrupt input (TX) designed to interrupt the flash pulse during high battery-current conditions. These logic inputs have internal 300kΩ (typical) pull-down resistors to GND. e n o ic in w C d i f A www.awinic.com.cn 16 l a i t n Control is done via an I2C-compatible interface. This includes adjustment of the Flash and Torch current levels, changing the Flash Timeout Duration, and changing the switch current limit. Additionally, there are flag and status bits that indicate flash current timeout, LED over-temperature condition, LED failure (open/short), device thermal shutdown, TX interrupt, and VIN under-voltage conditions. Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Functional Block Diagram SW AW36515 OVP IN Thermal Shutdown Protection UVLO POR VOVP IVFM OSC 2/4MHz OUT Boost Controller Current Limit TX SDA SCL Control Logic /Regsiter 2 Features Description ic in w Power On Reset LED2 IC Interface LED & OUT Short Detect n o C e d i f GND When the supply voltage VIN drops below a predefined voltage VPOR (2.0V typical), the device generates a reset signal to perform a power-on reset operation, which will reset all control circuits and configuration registers. Once VIN goes above around VPOR (2.0V typical), it should stay high for at least 2ms time before any I2C command can be accepted. A Software Reset By setting bit[7](Software Reset Bit) to a ‘1’ in the Boost Configuration Register(0x07) via I2C interface will reset the AW36515 internal circuit and all configuration registers, after the soft reset command is input through I2C, it needs to wait at least 2ms before any other I2C command can be accepted. Flash Mode In Flash Mode, the LED current sources (LED1/2) provide 256 target current levels from 3.91mA to 2A. The Flash currents are adjusted via the LED1 and LED2 Flash Brightness Registers. Flash mode is activated by the Enable Register(setting M1, M0 to '11'), or by pulling the STROBE/TORCH pin HIGH when bit[5] (Strobe Enable Bit) is ‘1’ in the Enable Register(0x01). Once the Flash sequence is activated the current source (LED1/2) ramps up to the programmed Flash current by stepping through all current steps until the programmed current is reached. www.awinic.com.cn 17 l a i t n LED1 FB Select STROBE/TORCH Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 When the device is enabled in Flash Mode through the Enable Register, all mode bits in the Enable Register are cleared after a flash timeout event. Torch Mode In Torch mode, the LED current sources (LED1/2) provide 256 target current levels from 0.98mA to 500mA on AW36515. The Torch currents are adjusted via the LED1 and LED2 Torch Brightness Registers. Torch mode is activated by the Enable Register (setting M1, M0 to '10'), or by pulling the STROBE/TORCH pin HIGH when bit[5] (Torch Enable Bit) is ‘1’ in the Enable Register(0x01). Once the TORCH sequence is activated the active current sources (LED1/2) ramps up to the programmed Torch current by stepping through all current steps until the programmed current is reached. The rate at which the current ramps is determined by the value chosen in the Timing Register. AW36515 will execute flash operation when both bit[4] and bit[5] are ‘1’ in the Enable Register with pulling the STROBE/TORCH pin HIGH. Torch Mode is not affected by Flash Timeout or by a TX Interrupt event. IR Mode e BOOST VOUT PASS OFF ic in w d i f n o C STROBE ILED1 A ILED2 M1,M0=‘01’ LED1,LED2=‘11’ STROBE EN=‘1’ M1,M0=‘01’ LED1,LED2=‘10’ STROBE EN=‘1’ M1,M0=‘00’ LED1,LED2=‘10’ STROBE EN=‘1’ IR Mode with Boost www.awinic.com.cn 18 l a i t n In IR Mode, Enable register bit[3:2] should be to ‘01’ (setting M1, M0 to '01') and the STROBE/TORCH pin should be enabled(Strobe Enable Bit). The target LED current is equal to the value stored in the LED1/2 Flash Brightness Registers. When IR mode is enabled, the boost converter turns on and set the output equal to the input (pass-mode) . The STROBE/TORCH pin can only be set to be Level sensitive, meaning all timing of the IR pulse is externally controlled, but it is still protected by flash time-out if STROBE width is too long. In IR Mode, the current sources do not ramp the LED outputs to the target. LED1/2 is enabled to the full current setting without delay or slow ramp during STROBE rising edge, and they are fully turned off immediately without delay or slow ramp during STROBE falling edge Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 VOUT STROBE ILED1 ILED2 M1,M0=‘01’ LED1,LED2=‘11’ STROBE EN=‘1’ M1,M0=‘01’ LED1,LED2=‘10’ STROBE EN=‘1’ M1,M0=‘00’ LED1,LED2=‘10’ STROBE EN=‘1’ IR Mode Pass Only l a i t n VOUT STROBE e ILED1 d i f Flash Timeout Value ILED2 M1,M0=‘01’ LED1,LED2=‘11’ STROBE EN=‘1’ ic in w Timeout Start Timeout Reset n o Timeout Start C Timeout Reset Timeout Start Timeout Reached VOUT goes low， LED1 &LED2 turn off IR Mode Timeout Soft Start-up Turn on the AW36515 Torch and Flash modes can be done through the Enable Register. On start-up, when VOUT is less than VIN the internal synchronous PMOS turns on as a current source and delivers 200mA (typical) to the output capacitor. During this time the current source (LED) is off. When the voltage across the output capacitor reaches 2.2 V (typical) the current source turns on. At turn-on the current source steps through each FLASH or TORCH level until the target LED current is reached. This gives the device a controlled turn-on and limits inrush current from the VIN supply. A Pass Mode The AW36515 starts up in Pass Mode and stays there until Boost Mode is needed to maintain regulation. In Pass Mode the boost converter does not switch, and the synchronous PMOS turns fully on bringing VOUT up to VIN − ILED × RPMOS. In Pass Mode the inductor current is not limited by the peak current limit. If the voltage difference between VOUT and VLED falls below VHR, the device switches to Boost Mode. AW36515 can be forced into pass mode only state regardless the VHR, which must be set before system enter Boost mode, once system enter Boost mode, the bit2 of Boost Configuration Register (0x07) is invalid unless setting the device enter standby mode, or by setting the SW RESET bit to a '1', or by removing power to the AW36515. www.awinic.com.cn 19 Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Power Amplifier Synchronization (TX) The TX pin is a Power Amplifier Synchronization input. This is designed to reduce the flash LED current and thus limit the battery current during high battery current conditions such as PA transmit events. When the AW36515 is engaged in a Flash event, and the TX pin is pulled high, the LED current is forced into Torch Mode at the programmed Torch current setting. If the TX pin is then pulled low before the Flash pulse terminates, the LED current returns to the previous Flash current level. At the end of the Flash time-out, whether the TX pin is high or low, the LED current turns off. The TX input can be disable by setting bit[7] (TX Enable) to a ‘0’ in the Enable Register(0x01). Input Voltage Flash Monitor (IVFM) The AW36515 has the ability to adjust the flash current based upon the voltage level present at the IN pin utilizing the Input Voltage Flash Monitor (IVFM). The adjustable threshold ranges from 2.9 V to 3.6 V in 100mV steps as well as adjustable hysteresis, with Stop-and-Hold mode. The IVFM threshold and hysteresis are controlled by bits[5:3] and bit[2] respectively, in the IVFM Register(0x02). The Flags2 Register has the IVFM flag bit set when the input voltage crosses the IVFM threshold value. Additionally, the IVFM threshold sets the input voltage boundary that forces the AW36515 to either stop ramping the flash current during startup in Stop and Hold Mode. a i t n  Stop and Hold Mode: Stops Current Ramp and holds the level for the remaining flash, If VIN falls below the IVFM threshold value. e d i f Flash Event n VIN o Stop & Hold Mode ic in w Flash Current T-Filter=4μs IVFM-Threshold C Target Flash Current Flash Current with IVFM Disable IVFM Mode A Flash Timeout The Flash Timeout period sets the maximum time of one flash event, whether a flash stop command is received or not. The AW36515 has 16 timeout levels ranging from 40ms to 1.6s (see TIMING CONFIGURATION REGISTER (0X08) for more detail). Flash Timeout applies to both Flash and IR modes, and it continues to count when the Flash mode is forced into Torch mode during a TX high event. The mode bits are cleared and bit[0] is set in the Flags1 register(0x0A) upon a Flash Timeout. This fault flag can be reset to '0' by reading back the Flags1 Register (0x0A), 'or by setting the SW RESET bit to a '1', or by removing power to the AW36515. Current Limit When the inductor current limit is reached, the AW36515 terminates the charging phase of the switching cycle until the next switching period. If the over-current condition persists, the device operates continuously in current limit. The AW36515 features two selectable inductor current limits(1.9A and 2.8A) that are programmable by bit[0] in Boost configuration Register(0x07). www.awinic.com.cn 20 l Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Since the current limit is sensed in the NMOS switch, there is no mechanism to limit the current when the device operates in Pass Mode (current does not flow through the NMOS in pass mode). The mode bits are not cleared upon a Current Limit event, but a flag bit[3] is set in the Flags1 register(0x0A). This fault flag can be reset to '0' by reading back the Flags1 Register (0x0A), or by setting the SW RESET bit to a '1', or by removing power to the AW36515. Undervoltage Lockout (UVLO) The AW36515 has an internal comparator that monitors the voltage at IN and forces the AW36515 into standby if the input voltage drops to 2.5 V. If the UVLO monitor threshold is tripped, the UVLO flag bit is set in the Flags1 Register (0x0A). If the input voltage rises above 2.5 V, the AW36515 is not available for operation until there is an I2C read of the Flags1 Register (0x0A). Upon a read, the Flags1 register is cleared, and normal operation can resume if the input voltage is greater than 2.5 V. VOUT Short Fault The Output Short Fault flag reads back a '1' if the device is active in Flash or Torch mode and the boost output experiences a short condition. VOUT short condition occurs if the voltage at OUT goes below 2.3V (typ.) while the device is in Torch or Flash mode. There is a deglitch time of 2.048ms before the VOUT Short flag is valid. The mode bits are cleared upon an the VOUT short fault. The AW36515 is not available for operation until VOUT Fault flags is cleared. The VOUT Short Fault can be reset to '0' by reading back the Flags1 Register (0x0A), or by setting the SW RESET bit to a '1', or by removing power to the AW36515. a i t n e d i f LED Short Fault The LED Short Fault flags read back a '1' if the device is active in Flash or Torch mode and either active LED output experiences a short condition. An LED short condition is determined if the voltage at LED1 or LED2 goes below 500mV (typ.) while the device is in Torch or Flash mode. There is a deglitch time of 256μs before the LED Short Fault flag is valid. The mode bits are cleared upon an LED Short Fault. The AW36515 is not available for operation until the LED Short Fault flags is cleared. The LED Short Faults can be reset to '0' by reading back the Flags1 Register (0x0A), or by setting the SW RESET bit to a '1', or by removing power to the AW36515. n o ic in w Overvoltage Protection (OVP) C The output voltage is limited to typically 5 V. In situations such as an open LED, the AW36515 raises the output voltage in order to try and keep the LED current at its target value. When VOUT reaches 5 V (typ.) the overvoltage comparator trips and turns off the internal NMOS. When VOUT falls below the “VOVP Off Threshold”, the AW36515 begins switching again. The mode bits are cleared, and the OVP Fault flag is set, when an OVP condition is present for three rising OVP edges. This prevents momentary OVP events from forcing the device to shut down. The AW36515 is not available for operation until the OVP Fault flag is cleared. The OVP Fault can be reset to '0' by reading back the Flags2 Register (0x0A), or by setting the SW RESET bit to a '1', or by removing power to the AW36515. A Thermal Shutdown (TSD) When the AW36515 die temperature reaches 155°C, the thermal shutdown detection circuit trips, forcing the AW36515 enter standby mode and writing a '1' to the Thermal Shutdown Fault flag of the Flags1 Register (0x0A) . The AW36515 is only allowed to restart after the Thermal Shutdown Fault flag is cleared. The Thermal Shutdown Faults can be reset to '0' by reading back the Flags1 Register (0x0A), or by setting the SW RESET bit to a '1', or by removing power to the AW36515. Upon restart, if the die temperature is still above 155°C, the AW36515 resets the Fault flag and re-enters standby mode. www.awinic.com.cn 21 l Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Programming Control Truth Table MODE1 MODE0 STROBE EN TORCH EN STROBE/TORCH PIN ACTION 0 0 0 0 X Standby 0 0 0 1 Pos edge Ext Torch 0 0 1 0 Pos edge Ext Flash 0 0 1 1 Pos edge Ext Flash 1 0 X X X Int Torch 1 1 X X X Int Flash 0 1 0 X X IRLED Standby 0 1 1 X 0 IRLED Standby 0 1 1 X Pos edge I2C Interface e d i f Data Validation When SCL is high level, SDA level must be constant. SDA can be changed only when SCL is low level. SCL ic in w n o SDA C Data Line Stable Data Valid Change of Data Allowed Data Validation Diagram I2C Start/Stop A I2C start: SDA changes from high level to low level when SCL is high level. I2C stop: SDA changes from low level to high level when SCL is high level. SDA SCL S/Sr P S: START condition Sr: START Repeated condition P: STOP condition Start and Stop Conditions www.awinic.com.cn 22 l a i t n IRLED Enabled Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 ACK (Acknowledgement) ACK means the successful transfer of I2C bus data. After master sends an 8-bit data, SDA must be released; SDA is pulled to GND by slave device when slave acknowledges. When master reads, slave device sends 8-bit data, releases the SDA and waits for ACK from master. If ACK is sent and I2C stop is not sent by master, slave device sends the next data. If ACK is not send by master, slave device stops to send data and waits for I2C stop. Data Output by Transmiter Not Acknowledge（NACK） Data Output by Receiver Acknowledge（ACK） 2 1 SCL From Master 8 9 Clock Pulse for Acknowledgement START condition l a i t n I2C ACK Timing Write Cycle One data bit is transferred during each clock pulse. Data is sampled during the high state of the serial clock (SCL). Consequently, throughout the clock’s high period, the data should remain stable. Any changes on the SDA line during the high state of the SCL and in the middle of a transaction, aborts the current transaction. New data should be sent during the low SCL state. This protocol allows a single data line to transfer both command/control information and data using the synchronous serial clock. e d i f n Each data transaction is composed of a Start Condition, a number of byte transfers (set by the software) and a Stop Condition to terminate the transaction. Every byte written to the SDA bus must be 8 bits long and is transferred with the most significant bit first. After each byte, an Acknowledge signal must follow. o C In a write process, the following steps should be followed: ic in w a) Master device generates START condition. The “START” signal is generated by lowering the SDA signal while the SCL signal is high. b) c) A d) Master device sends slave address (7-bit) and the data direction bit (R/W = 0). Slave device sends acknowledge signal if the slave address is correct. Master sends control register address (8-bit) e) Slave sends acknowledge signal f) Master sends data byte to be written to the addressed register g) Slave sends acknowledge signal h) If master will send further data bytes the control register address will be incremented by one after acknowledge signal (repeat step f and g) i) Master generates STOP condition to indicate write cycle end SCL 0 1 2 3 4 5 6 7 8 0 1 2 3 4 5 6 7 8 0 1 2 3 4 5 6 7 8 A6 A5 A4 A3 A2 A1 A0 R/WAck A7 A6 A5 A4 A3 A2 A1 A0 Ack D7 D6 D5 D4 D3 D2 D1 D0 Ack SDA Start Device Address Register Address Write Data Stop I2C Write Timing www.awinic.com.cn 23 Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Read Cycle In a read cycle, the following steps should be followed: a) Master device generates START condition. b) Master device sends slave address (7-bit) and the data direction bit (R/W = 0). c) Slave device sends acknowledge signal if the slave address is correct. d) Master sends control register address (8-bit). e) Slave sends acknowledge signal. f) Master generates STOP condition followed with START condition or REPEAT START condition. g) Master device sends slave address (7-bit) and the data direction bit (R/W = 1). h) Slave device sends acknowledge signal if the slave address is correct. i) Slave sends data byte from addressed register. j) If the master device sends acknowledge signal, the slave device will increase the control register address by one, then send the next data from the new addressed register. k) If the master device generates STOP condition, the read cycle is ended. SCL 0 1 2 3 4 5 SDA A6 A5 A4 A3 A2 A1 start 7 8 0 1 A0 R/W Ack A7 A6 Device Address …… Using Repeat start…… 1 2 3 4 A6 A5 A4 A3 A2 ic in w …… Separated Read/write transaction …… P S 3 4 e 5 d i f n o 5 A1 C 6 7 8 0 A0 R/W Ack D7 A5 A4 A3 A2 6 7 A1 A0 0 1 2 3 4 5 A6 A5 A4 A3 A2 A1 6 1 ... 6 D6 …… D1 7 8 Ack 8 D0 Ack stop Read Data Device Address 7 8 0 A0 R/W Ack D7 Device Address A 2 Register Address 0 RS www.awinic.com.cn 6 a i t n 1 ... 6 7 D6 …… D1 D0 Read Data 8 Ack stop I2C Read Timing 24 l Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Register Configuration Register List Register name Address(HEX) Read/Write Default Value Chip ID Register 0x00 Read 0x30 Enable Register 0x01 Read/Write 0x80 IVFM Register 0x02 Read/Write 0x01 LED1 Flash Brightness Register 0x03 Read/Write 0x7F LED2 Flash Brightness Register 0x04 Read/Write 0x7F LED1 Torch Brightness Register 0x05 Read/Write 0x7F LED2 Torch Brightness Register 0x06 Read/Write 0x7F Boost Configuration Register 0x07 Read/Write Timing Configuration Register 0x08 Read/Write Flags1 Register 0x0A Read Flags2 Register 0x0B Read Device ID Register 0x0C Read Last Flash Register 0x0D Read  ic in w 0x00 e d i f 0x00 0x02 0x00 Chip ID Register (0x00) Bit 7 A Chip ID:  C a i t n 0x1A n o Register Detailed Description l 0x09 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 LED2 Enable 0=OFF (Default) 1=ON LED1 Enable 0=OFF (Default) 1=ON “00110000” Enable Register (0x01) Bit 7 TX Pin Enable 0=Disabled 1=Enabled (Default) Bit 6 Strobe Type 0=Level Triggered (Default) 1=Edge Triggered Strobe Enable 0=Disabled (Default) 1=Enabled Torch Enable 0=Disabled (Default) 1=Enabled Mode Bits: M1, M0 00=Standby (Default) 01=IR Drive 10=Torch 11=Flash Note: In Edge or Level Strobe Mode, it is recommended that the trigger pulse width be set greater than 1ms to ensure proper turn-on of the device. www.awinic.com.cn 25 Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1  IVFM Register (0x02) Bit 7 RFU Bit 6  UVLO Circuitry 0=Disabled (Default) 1=Enabled Bit 5 Bit 4 Bit 3 IVFM Levels 000=2.9 V (Default) 001=3.0 V 010=3.1 V 011=3.2 V 100=3.3 V 101=3.4 V 110=3.5 V 111=3.6 V Bit 2 RFU Bit 1 RFU Bit 0 IVFM Enable 0=Disabled (Default) 1=Enabled LED1 Flash Brightness Register (0x03) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 LED1 Flash Brightness Levels IFLASH(mA)≈(Brightness Code*7.83mA)+3.91mA 00000000=3.91 mA …………… 01111111=998.32 mA …………… 11111111=2.0 A  l Bit 6 Bit 5 Bit 4 00000000=3.91 mA …………… 01111111=998.32 mA …………… 11111111=2.0 A ic in w C Bit 2 Bit 1 Bit 0 n o (Default) d i f Bit 3 LED2 Flash Brightness Levels IFLASH(mA)≈(Brightness Code*7.83mA)+3.91mA  e LED2 Flash Brightness Register (0x04) Bit 7 a i t n (Default) LED1 Torch Brightness Register (0x05) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Bit 3 Bit 2 Bit 1 Bit 0 LED1 Torch Brightness Levels ITORCH(mA)≈(Brightness Code*1.96mA)+0.98mA A 00000000=0.98 mA …………… 01111111=249.9 mA …………… 11111111=500 mA  (Default) LED2 Torch Brightness Register (0x06) Bit 7 Bit 6 Bit 5 Bit 4 LED2 Torch Brightness Levels ITORCH(mA)≈(Brightness Code*1.96mA)+0.98mA 00000000=0.98 mA …………… 01111111=249.9 mA …………… 11111111=500 mA (Default) www.awinic.com.cn 26 Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1  Boost Configuration Register (0x07) Bit 7 Bit 6 Software Reset Bit 0=Not Reset (Default) 1=Reset  RFU Bit 6 RFU RFU Bit 3 Bit 5 Bit 4 Bit 6 VOUT Short Fault LED1 Short Fault Bit 2 Flash Time-out Duration 0000=40 ms 0001=80 ms 0010=120 ms 0011=160 ms 0100=200 ms 0101=240 ms 0110=280 ms 0111=320 ms 1000=360 ms 1001=400 ms 1010=600 ms (Default) 1011=800 ms 1100=1000 ms 1101=1200 ms 1110=1400 ms 1111=1600 ms Bit 5 ic in w RFU Boost Current Limit 0=1.9A 1=2.8A (Default) C LED2 Short Fault Bit 3 Current Limit Flag Bit 1 Bit 2 Thermal Shutdown (TSD) Fault Bit 0 l a i t n e d i f n o Bit 4 Bit 6 RFU Bit 5 RFU Bit 4 RFU Bit 3 RFU Bit 2 IVFM Trip Flag A Bit 1 UVLO Fault Bit 0 Flash Time-Out Flag Bit 1 OVP Fault Bit 0 RFU Device ID Register (0x0C) Bit 7 RFU Bit 6 RFU Bit 5 RFU Bit 4 Bit 3 Device ID “00” Bit 2 Bit 1 Bit 0 Silicon Revision Bits “010” Last Flash Register (0x0D) Bit 7 RFU Boost Frequency Select 0=2 MHz (Default) 1=4 MHz Bit 0 Flags2 Register (0x0B) Bit 7  Bit 1 Boost Mode 0=Normal (Default) 1=Pass Mode Only Bit 3 Flags1 Register (0x0A) TX Flag  Bit 2 LED Pin Short Fault Detect 0=Disabled 1=Enabled (Default) Torch Current Ramp time 000=No Ramp 001=1 ms (Default) 010=32 ms 011=64 ms 100=128 ms 101=256 ms 110=512 ms 111=1024 ms Bit 7  RFU Bit 4 Timing Configuration Register (0x08) Bit 7  Bit 5 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 The value stored is always the last current value the IVFM detection block set ILED=IFLASH-TARGET*((code+1)/256) www.awinic.com.cn 27 Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Application Information The AW36515 can drive two flash LEDs at currents up to 2 A per LED. The 2MHz/4MHz DC-DC boost regulator allows for the use of small value discrete external components. Below are some peripheral selection guidelines. Output Capacitor Selection The AW36515 is designed to operate with a 10µF ceramic output capacitor. When the boost converter is running, the output capacitor supplies the load current during the boost converter on-time. When the NMOS switch turns off, the inductor energy is discharged through the internal PMOS switch, supplying power to the load and restoring charge to the output capacitor. This causes a sag in the output voltage during the on-time and a rise in the output voltage during the off-time. The output capacitor is therefore chosen to limit the output ripple to an acceptable level depending on load current and input/output voltage differentials and also to ensure the converter remains stable. e For continuous conduction mode, the output voltage ripple due to the capacitor discharge is: VQ  d i f (VOUT  VIN )  I LED VOUT  f  COUT n The output voltage ripple due to the output capacitors ESR is found by: V  I I  VESR  RESR   OUT LED  L  VIN 2   o I L  C Where VIN  (VOUT  VIN ) VOUT  f  L In ceramic capacitors the ESR is very low so the assumption is that 80% of the output voltage ripple is due to capacitor discharge and 20% from ESR. Table 1 lists different manufacturers for various output capacitors and their case sizes suitable for use with the AW36515. ic in w Input Capacitor Selection Choosing the correct size and type of input capacitor helps minimize the voltage ripple caused by the switching of the AW36515 boost converter and reduce noise on the boost converter's input pin that can feed through and disrupt internal analog signals. In the typical application circuit a 10-µF ceramic input capacitor works well. It is important to place the input capacitor as close as possible to the AW36515 input (IN) pin. This reduces the series resistance and inductance that can inject noise into the device due to the input switching currents. Table 1 lists various input capacitors recommended for use with the AW36515. A Table 1 Recommended Input/ Output Capacitors (X5R/X7R Dielectric) MANUFACTURER PART NUMBER VALUE CASE VOLTAGE RATING TDK C1608JB0J106M 10μF 0603 6.3V TDK C2012JB1A106M 10μF 0805 10V Murata GRM188R60J106M 10μF 0603 6.3V Murata GRM21BR61A106KE19 10μF 0805 10V www.awinic.com.cn 28 l a i t n Larger capacitors such as a 22µF or capacitors in parallel can be used if lower output voltage ripple is desired. To estimate the output voltage ripple considering the ripple due to capacitor discharge (ΔVQ) and the ripple due to the capacitors ESR (ΔVESR) use the following equations: Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Inductor Selection The AW36515 is designed to use a 0.47µH or 1µH inductor. When the device is boosting (VOUT > VIN) the inductor is typically the largest area of efficiency loss in the circuit. Therefore, choosing an inductor with the lowest possible series resistance is important. Additionally, the saturation rating of the inductor should be greater than the maximum operating peak current of the AW36515. This prevents excess efficiency loss that can occur with inductors that operate in saturation. For proper inductor operation and circuit performance, ensure that the inductor saturation and the peak current limit setting of the AW36515 are greater than IPEAK in the following calculation: I PEAK  I LED  VOUT  I L   VIN I L  where VIN  VOUT  VIN  2  f SW  L  VOUT And f SW =2 or 4MHz. l Table 2 lists various inductors and their manufacturers that work well with the AW36515. a i t n Table 2 Recommended Inductors MANUFACTURER L PART NO. SIZE TOKO 1μH DFE201610P-1R0M 2.0 mm x 1.6 mm x 1.0 mm TOKO 0.47μH DFE201610P-R470M 2.0 mm x 1.6 mm x 1.0 mm Sunlord 1μH WPN252012H1R0MT 2.5mm × 2.0mm ×1.2mm e ic in w RDC 3.7A 58mΩ 4.1A 32mΩ 3.4A 48mΩ n o C d i f ISAT A www.awinic.com.cn 29 Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 PCB Layout Consideration Layout Guidelines The high switching frequency and large switching currents of the AW36515 make the choice of layout important. The following steps should be used as a reference to ensure the device is stable and maintains proper LED current regulation across its intended operating voltage and current range. 1. Place CIN on the top layer (same layer as the AW36515) and as close to the device as possible. The input capacitor conducts the driver currents during the low-side MOSFET turn-on and turn-off and can detect current spikes over 2 A in amplitude. Connecting the input capacitor through short, wide traces to both the IN and GND pins reduces the inductive voltage spikes that occur during switching which can corrupt the VIN line. 2. Place COUT on the top layer (same layer as the AW36515) and as close as possible to the OUT and GND pin. The returns for both CIN and COUT should come together at one point, as close to the GND pin as possible. Connecting COUT through short, wide traces reduce the series inductance on the OUT and GND pins that can corrupt the VOUT and GND lines and cause excessive noise in the device and surrounding circuitry. a i t n 3. Connect the inductor on the top layer close to the SW pin. There should be a low-impedance connection from the inductor to SW due to the large DC inductor current, and at the same time the area occupied by the SW node should be small so as to reduce the capacitive coupling of the high dV/dT present at SW that can couple into nearby traces. e d i f 4. Avoid routing logic traces near the SW node so as to avoid any capacitive coupling from SW onto any high-impedance logic lines such as TX, STROBE/TORCH, SDA, and SCL. A good approach is to insert an inner layer GND plane underneath the SW node and between any nearby routed traces. This creates a shield from the electric field generated at SW. n o C 5. Terminate the Flash LED cathodes directly to the GND pin of the AW36515. If possible, route the LED returns with a dedicated path so as to keep the high amplitude LED currents out of the GND plane. For Flash LEDs that are routed relatively far away from the AW36515, a good approach is to sandwich the forward and return current paths over the top of each other on two layers. This helps reduce the inductance of the LED current paths. ic in w A www.awinic.com.cn 30 l Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Package Description Pin1 Corner l a i t n TOP VIEW e ic in w n o C SIDE VIEW d i f 0.40 TYP D A C SYMM ℄ B A 1 2 SYMM ℄ 3 BOTTOM VIEW Unit: mm www.awinic.com.cn 31 Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Land Pattern Data 0.40 TYP A 0.40 TYP B SYMM ℄ C D l 3 2 1 a i t n SYMM ℄ 0.05 MAX All AROUND 0.05 MIN All AROUND METAL d i f n o NO N SOLDER MASK DEFINED ic in w e SOLDER MASK OPENING SOLDER MASK OPENING METAL UNDER SOLDER MASK SOLDER MASK DEFINED C Unit: mm A www.awinic.com.cn 32 Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Tape and Reel Information TAPE DIMENSIONS REEL DIMENSIONS P1 P2 P0 K0 W B0 D1 A0 Cavity A0：Dimension designed to accommodate the component width B0：Dimension designed to accommodate the component length K0：Dimension designed to accommodate the component thickness W：Overall width of the carrier tape P0：Pitch between successive cavity centers and sprocket hole P1：Pitch between successive cavity centers P2：Pitch between sprocket hole D1：Reel Diameter D0：Reel Width D0 QUADRANT ASSIGNMENTS FOR PIN 1 ORIENTATION IN TAPE Sprocket Holes n Q2 Q1 Q2 Q1 Q2 Q1 Q2 Q3 Q4 Q3 Q4 Q3 Q4 Q3 Q4 o C Pocket Quadrants ic in w e d i f Pin 1 Q1 a i t n User Direction of Feed DIMENSIONS AND PIN1 ORIENTATION A D1 (mm) D0 (mm) A0 (mm) B0 (mm) K0 (mm) P0 (mm) P1 (mm) P2 (mm) W (mm) Pin1 Quadrant 180 9.5 1.4 1.85 0.75 2 4 4 8 Q1 All dimensions are nominal www.awinic.com.cn 33 l Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 Revision History Version Date Change Record V1.0 Oct. 2018 Product Datasheet V1.0 Released V1.1 Oct. 2019 I2C address is modified l a i t n e n o ic in w C d i f A www.awinic.com.cn 34 Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD AW36515 Oct. 2019 V1.1 DISCLAIMER Information in this document is believed to be accurate and reliable. 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