MP3332 Dual-Channel Flash LED Driver, 1.5A/Ch with I2C Interface DESCRIPTION The MP3332 is a dual-channel, flash LED driver for high-resolution camera phones. It comes in a very compact package and is highly efficient at improving image and video quality in low-light environments. The synchronous boost converter operates at 1/2/3/4MHz to provide higher efficiency and an optimized solution for smaller PCB spaces. The MP3332 features a standard I2C interface, dual LED channels, high-power density, and multiple protection features. The MP3332 supports flash, assist, torch, indicator, and 5V DC modes. To improve thermal performance, the cathodes of the dual flash LED are referenced to GND for a better layout. It is available in a WLCSP-16 (1.7mmx1.7mm) package. FEATURES 2.7V~5.5V Input Voltage Dual-Channel, 1.5A/Ch Flash Current with +/-7% Accuracy 1/2/3/4MHz Selectable Switching Frequency and Switching Frequency Foldback Function 400kHz I2C Compatible Interface Standby/Flash/Assist/Torch/Indicator/5V DC Modes Flash Mode: Up to 1.5A/Ch Programmable Current with +/-7% Accuracy for Each LED Assist/Torch Mode: Up to 500mA/Ch Programmable Current with +/-7% Accuracy for Each LED Indicator Mode: Works in 31.5kHz PWM Operation with 2/16, 3/16, 4/16, 5/16 Duty Cycle 128ms/256ms/512ms Selectable Blinking Time 5V DC Mode: Constant 5V DC Output External Torch/Strobe LED Forward-Voltage Balance to Improve Efficiency 1A to 4.2A Programmable Input DC Current-Limit Protection Low-Battery Voltage Protection LED Short/Open Protection VOUT-GND Short Protection Over-Voltage Protection (OVP) Over-Temperature Protection (OTP) NTC Detection and Protection Input Under-Voltage Lockout (UVLO) Protection Available in a WLCSP-16 (1.7mmx1.7mm) Package APPLICATIONS LED Flash for Smart Phones Cameras for Tablet Digital Still Camera All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For MPS green status, please visit the MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are registered trademarks of Monolithic Power Systems, Inc. MP3332 Rev. 1.0 5/1/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 1 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE TYPICAL APPLICATION L OUT IN IN C1 SW OUT C2 MP3332 STR LED1 LED2 TX TOR NTC R SDA SCL MP3332 Rev. 1.0 5/1/2018 PGND VSS www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 2 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE ORDERING INFORMATION Part Number* Package Top Marking MP3332GC WLCSP-16 (1.7mmx1.7mm) See Below * For Tape & Reel, add suffix –Z (e.g. MP3332GC–Z ) TOP MARKING DFY: Product code of MP3332GC LLL: Lot number PACKAGE REFERENCE TOP VIEW 1 2 3 4 LED1 OUT SW PGND A LED2 OUT SW PGND B TOR TX STR VSS C NTC SDA SCL IN D WLCSP-16 (1.7mmx1.7mm) MP3332 Rev. 1.0 5/1/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 3 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance (4) VIN, VSW, VOUT ..................................-0.3V to +6V NTC ....................................... -0.3V to VIN +0.3V All other pins ...................................-0.3V to +6V Junction temperature ................................150°C Lead temperature .....................................260°C Continuous power dissipation (TA = 25°C) (2) ................................................................. 1.47W WLCSP-16 (1.7mmx1.7mm) …85 ... ..0.5…°C/W Recommended Operating Conditions (3) Supply voltage (VIN) ........................ 2.7V to 5.5V Operating junction temp. (TJ). .. -40°C to +125°C MP3332 Rev. 1.0 5/1/2018 θJA θJC NOTES: 1) Exceeding these ratings may damage the device. 2) The maximum allowable power dissipation is a function of the maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by PD (MAX) = (TJ (MAX)-TA)/θJA. Exceeding the maximum allowable power dissipation produces an excessive die temperature, causing the regulator to go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. 3) The device is not guaranteed to function outside of its operating conditions. 4) Measured on JESD51-7, 4-layer PCB. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 4 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE ELECTRICAL CHARACTERISTICS VIN = 3.6V, TA = 25°C, unless otherwise noted. Parameters Symbol Condition Min Typ Max Units 5.5 V Supply Operating input voltage Input UVLO threshold VIN VIN_UVLO 2.7 Rising edge Input UVLO hysteresis Standby current Operating quiescent current IQ_STANDBY 2.5 V 100 mV 2 VIN = 2.7V to 5.5V, I C active IQ VIN = 3.6V, no switching, pass mode fs SW_FS = 11 15 1 µA mA Switching Regulator Switching frequency Minimum on time 0.9 tON_MIN 1 1.1 MHz 68 ns NMOS on resistance RDSON_N VIN = 3.6V 65 mΩ PMOS on resistance RDSON_P VIN = 3.6V 80 mΩ Constant DC output voltage VOUT_5V 5V DC mode 5 V 3.5 A 0 mA Inductor current limit(5) ILIMIT Code setting = 10, max duty cycle LED Driver Flash current setting Torch current setting Current source headroom voltage Current ramp-up step time(5) Current ramp-down step time(5) LED1/2 load balance voltage hysteresis Digital Input ILED_FLASH ILED_TORCH Flash mode, value setting = 00000000 Flash mode, value setting = 00110011 Assist light/torch mode, value setting = 00000000 Assist light /torch mode, value setting = 00110011 Current = 1250mA(5) 279 300 0 279 300 mA mA 321 mA 350 mV 190 mV TUP_I = 111 1 µs TUP_I = 000 8 µs tRAMP_DOWN 1 µs VLED_HYS 125 mV VHD tRAMP_UP Current = 200mA Input logic low voltage Input logic high voltage STR/TOR/TX pull-down resistor 321 0.4 1.2 V V 250 kΩ NOTE: 5) Guaranteed by design. MP3332 Rev. 1.0 5/1/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 5 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE ELECTRICAL CHARACTERISTICS (continued) VIN = 3.6V, TA = 25°C, unless otherwise noted. Parameters Symbol Condition Min Typ Max Units Time-out time tTIMEOUT Time setting code = 0011 190 200 210 ms Input DC current limit(5) ILIMIT_IN Current setting code = 0010 boost mode Protection Over-voltage threshold LED1/2 short detection voltage PMOS charge current LED1/2 open detection voltage Thermal shutdown threshold VOVP 1.5 5.335 VLED_ST 5.5 A 5.665 V 1 V 230 mA VLED_OP 100 mV Tj_SD 150 °C 130 °C 0.6 1.02 3 3.6 V V V V VOUT < 2.3V Adaptive thermal threshold NTC detection voltage VNTC Low battery threshold VBAT_LOW Code setting = 001 Code setting = 111 Code setting = 000 Code setting = 110 I2C Interface Input logic low VIL Input logic high VIH Output logic low VOL SCL clock frequency FSCL SCL high time tHIGH 0.6 µs SCL low time tLOW 1.3 µs Data setup time tSU,DAT 100 ns Data hold time tHD,DAT 0 Setup time for repeated start tSU,STA 0.6 µs Hold time for start Bus free time between a start and stop condition Setup time for stop condition tHD,STA 0.6 µs tBUF 1.3 µs tSU,STO 0.6 20+0.1 *CB 20+0.1 *CB µs 300 ns 300 ns 0 50 ns 400 pF Rise time of SCL and SDA tR Fall time of SCL and SDA tF Pulse width of suppressed spike Capacitance bus for each bus line tSP 0.4 1.3 ILOAD = 3mA CB V V 0.4 V 400 kHz 0.9 µs NOTE: 5) Guaranteed by design. MP3332 Rev. 1.0 5/1/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 6 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE I2C Compatible Interface Timing Diagram MP3332 Rev. 1.0 5/1/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 7 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE TYPICAL PERFORMANCE CHARACTERISTICS VIN = 3.6V, 2-Channel, L = 1.2µH, TA = 25°C, unless otherwise noted. MP3332 Rev. 1.0 5/1/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 8 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.6V, 2-Channel, L = 1.2µH, TA = 25°C, unless otherwise noted. MP3332 Rev. 1.0 5/1/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 9 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE PIN FUNCTIONS Pin # Name Description A1 LED1 Current source for LED1. Connect the anode of an LED to LED1. A2/B2 OUT Boost converter output. A3/B3 A4/B4 B1 C1 SW PGND LED2 TOR C2 C3 C4 TX STR Strobe signal input. STR synchronizes the flash pulse. Pull STR low internally to float. VSS Analog GND. D1 NTC LED temperature detection. Connect NTC to GND with an NTC resistor when the NTC function is used. Float NTC when not in use. D2 SDA I2C interface data input. D3 SCL D4 IN I2C interface clock input. Input supply. IN provides the power for the internal power and logic circuit. Bypass IN locally. MP3332 Rev. 1.0 5/1/2018 Boost converter switching node. Power GND. Current source for LED2. Connect the anode of an LED to LED2. Torch mode input signal. Synchronization input signal for RF transmission signal. Pull TX low internally to float. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 10 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE SW SW IN OVP Regulator OUT Input Current Limit OSC OUT RAMP LED1 PWM Control SCL SDA STR TX TOR Current Control LED2 EA 2 IC Control LED1&2 Feedback Protection Control VSS NTC DEC PGND NTC PGND Figure 1: Functional Block Diagram MP3332 Rev. 1.0 5/1/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 11 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE OPERATION The MP3332 is a dual-channel, flash LED driver with an I2C interface for phone and tablet cameras. It works in standby mode, flash mode, assist mode, torch mode, indicator mode, and fixed 5V DC output mode. works in a selectable 1M/2M/3M/4MHz switching frequency with a synchronous rectifier PMOS. When enabled, the synchronous PMOS works as a 230mA current source to charge the output capacitor until VOUT rises to 2.3V. If the voltage across the current source (VOUT-VLED) is less than the target reference (set by VTH_PAS1/2 bits, 05H register), the IC works in boost switching mode; otherwise, it works in pass mode. In pass mode, the synchronous PMOS is turned on completely. During the current start-up, the current ramps up step-bystep to the target current. Table 1 shows how to set the operation mode and flash trigger mode when the STR_POL bit is set to 1. If STR_POL is set to 0, STR switches to low. LED Driver Operation The MP3332 uses PWM mode with peak current control to regulate the LED current. It Table 1: Operation Mode Setting and Flash Trigger Mode Configuration TX Pin TOR Pin X High X X X 0 1 X X X X X X X Mode STR STR_MOD Float High Float High X High High X X X 1 X 1 X 1 1 0 X LED1/2_EN 5V_MOD LED_MOD 1 X 00 1 X 10 1 1 1 1 X X X X X 1 01 11 11 11 X Standby Mode In default, if VIN is higher than UVLO, the device switches to standby mode; the I2C is active and is ready to communicate with the host. Torch Mode If TOR goes high in standby mode, the device switches to torch mode, and the current ramps up step-by-step after setting LED1/2_EN to 1. The LED1 and LED2 currents can be set by registers I1_TOR and I2_TOR respectively. The ramp-up slew rate can be set by register TUP_I. The current can be disabled by pulling TOR low or by setting LED1/2_EN to 0. LED1_EN and LED2_EN control LED1 and LED2’s current sources respectively. After pulling TOR low, the LED1/2_EN and LED_MOD bits are reset to the default value automatically if LED_SD is 0. If LED_SD is 1, LED1/2_EN does not reset (see Figure 2). MP3332 Rev. 1.0 5/1/2018 Torch Torch to flash Assist light Assist to flash Indicator Flash Flash Flash 5V MP3332 Torch Mode: ILED1 ILED2 TOR I2C REG 0x0C/D I1_TOR=XXXX I2_TOR=XXXX REG 0x01, LED_MOD=00 REG 0x01, LED1_EN=1 LED2_EN=1 Reset, LED1_EN to 0 LED2_EN to 0 Figure 2: Torch Mode www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 12 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE Assist Mode The device enters assist mode by setting LED_MOD to 10 and the LED1/2_EN bits to 1 (see Figure 3). The LED1 and LED2 current sources are controlled by the LED1_EN and LED2_EN bits respectively. The ramp-up slew rate can be set by register TUP_I. The currents can be disabled by switching to standby mode or by setting the LED1_EN and LED2_EN bits to 0. If blinking function is enabled, LED1/2 turn on for the blinking time and then turn off for the same blinking time period. The cycle repeats continuously in indicator mode (see Figure 5). The blinking time is set by the TBK0/1 bits in register 0FH. TBlink TBlink LED1/2 Figure 5: Blinking Function MP3332 Assist Mode: Flash Mode The device can work in flash mode in the following ways: ILED1 ILED2 I2C REG 0x0C/0D, I1_TOR=XXXX 2I_TOR=XXXX REG 0x01, LED_MOD=10 REG 0x01, LED1_EN=1 LED2_EN=1 Set REG 0x01, LED1_EN to 0 LED2_EN to 0 Or Set LED_MOD=00 Figure 3: Assist Mode Indicator Mode The device enters indicator mode for a lower current output when LED_MOD is set to 01, and LED1/2 is set to 1 (see Figure 4). In indicator mode, the driver outputs a current in 31.5kHz PWM dimming mode. The current amplitude is set by I1_TOR and I2_TOR, and the duty cycle is set by the INDI_PWM register. Set the LED1/2_EN bits to 0, or switch to standby mode to disable indicator mode. The LED1 and LED2 current sources are controlled by the LED1_EN and LED2_EN bits respectively. 1. Hardware and Level Trigger Mode In this mode, STR_MOD = 1, STR_LV = 1, LED1/2_EN = 1, and LED_MOD = 11. The flash current starts ramping up after STR goes high. The currents are set by I_FL_1 and I_FL_2, and the ramp-up time is set by TUP_I. The flash current ends when STR is pulled low. After the flash, LED_MOD is reset to standby mode, and LED1/2_EN is reset to 0 if LED_SD = 0. If LED_SD = 1, LED_MOD and LED1/2_EN are not reset. The LED1 and LED2 current sources are controlled by the LED1_EN and LED2_EN bits respectively. If the flash timer set by the register bit FL_TIM ends before STR goes low, the flash current terminates immediately. LED_MOD and LED1/2_EN are reset to the default value if LED_SD is 0 and the time-out fault bit FT_TO is set to 1 and is not cleared until it is read back, or the input power is reset (see Figure 6 and Figure 7). MP3332 Hardware and Level Sensitive Flash Mode w/o Timer-Out: ILED1 MP3332 Indicator Mode: ILED2 ILED1 FL_TIMER ILED2 STR I2C I2C REG 0x0C/D, I1_TOR=XXXX I2_TOR=XXXX REG 0x01, LED_MOD=01 REG 0x05, INDI_PWM=xx REG 0x01, LED1_EN=1 LED2_EN=1 Set REG 0x01, LED1_EN to 0 LED2_EN to 0 Or Set LED_MOD=00 Figure 4: Indicator Mode MP3332 Rev. 1.0 5/1/2018 REG 0x01, STR_MOD=1 STR_LV=1 LED_MOD=11 REG 0x06/7, I1_FL=XXXX I2_FL=XXXX Setting Time REG 0x03, FL_TIM=XXXX REG 0x01, LED1_EN=1 LED2_EN=1 Reset, LED1_EN to 0 LED2_EN to 0 LED_MOD=00 Figure 6: Hardware and Level Trigger Flash Mode without Timer-Out www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 13 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE MP3332 Hardware and Level Sensitive Flash Mode w/ Timer-Out: ILED1 ILED2 FL_TIMER STR I2C REG 0x01, STR_MOD=1 STR_LV=1 LED_MOD=11 REG 0x06/7, I1_FL=XXXX I2_FL=XXXX REG 0x03, FL_TIM=XXXX REG 0x01, LED1_EN=1 LED2_EN=1 Reset, LED1_EN to 0 LED2_EN to 0 LED_MOD to 00 Set REG 0x0D, FT_TO=1 Figure 7: Hardware and Level Trigger Flash Mode with Timer-Out 2. Hardware and Edge Trigger Mode In this mode, STR_MOD = 1, STR_LV = 0, LED1/2_EN = 1, and LED_MOD = 11 (see Figure 8). The flash current begins ramping up after STR goes high. The LED1 and LED2 currents are set by I_FL_1 and I_FL_2 respectively, and the ramp-up time is set by TUP_I. The flash current ends when the flash timer set by FL_TIM ends. After the flash, the LED_MOD is reset to standby mode, and LED1/2_EN is reset to 0 if LED_SD = 0. If LED_SD = 1, the mode, LED_MOD, and LED1/2_EN are not reset. The LED1 and LED2 current sources are controlled by the LED1_EN and LED2_EN bits respectively. MP3332 Hardware and Edge Sensitive Flash Mode: 3. Software and Edge Trigger Mode In this mode, STR_MOD = 0, LED1/2_EN = 1, and LED_MOD = 11 (see Figure 9). The LED1 and LED2 currents are set by I_FL_1 and I_FL_2 respectively, and the ramp-up time is set by TUP_I. The flash current ends when the flash timer set by FL_TIM ends. After the flash, LED_MOD is reset to standby mode, and LED1/2_EN is reset to 0 if LED_SD = 0. If LED_SD = 1, LED_MOD and LED1/2_EN are not reset. The LED1 and LED2 current sources are controlled by the LED1_EN and LED2_EN bits respectively. MP3332 Software and Edge Sensitive Flash Mode: ILED1 ILED2 FL_TIMER I2C REG 0x01, STR_MOD=0 LED_MOD=11 REG 0x06/7, I1_FL=XXXX I2_FL=XXXX REG 0x03, FL_TIM=XXXX REG 0x01, LED1_EN=1 LED2_EN=1 Reset, LED1_EN to 0 LED2_EN to 0 LED_MOD to 00 Figure 9: Software and Edge Trigger Flash Mode Torch Mode to Flash Mode The MP3332 can switch to flash mode from torch mode directly when STR goes high if STR_MOD=1 (see Figure 10). After the flash, the part operates in flash mode. MP3332 Torch Mode to Flash Mode: ILED1 ILED1 ILED2 ILED2 STR TOR STR FL_TIMER FL_TIMER Setting Time I2C I2C REG 0x01, STR_MOD=1 STR_LV=0 LED_MOD=11 REG 0x06/7, I1_FL=XXXX I2_FL=XXXX REG 0x03, FL_TIM=XXXX REG 0x01, LED1_EN=1 LED2_EN=1 Reset, LED1_EN to 0 LED2_EN to 0 LED_MOD to 00 Figure 8: Hardware and Edge Trigger Flash Mode MP3332 Rev. 1.0 5/1/2018 REG 0x0C/D, I1_TOR=XXXX I2_TOR=XXXX REG 0x06/7, I1_FL=XXXX I2_FL=XXXX REG 0x01, LED_MOD=00 STR_MOD=1 STR_LV=1 REG 0x01, LED1_EN=1 LED2_EN=1 REG 0x03, FL_TIM=XXXX Reset, LED1_EN to 0 LED2_EN to 0 LED_MOD=00 REG 0x01, LED1_EN=1 LED2_EN=1 STR_MOD=1 STR_LV=0 REG 0x03, FL_TIM=XXXX Reset, LED1_EN to 0 LED2_EN to 0 LED_MOD=00 Figure 10: Torch Mode to Flash Mode www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 14 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE Assist Mode to Flash Mode During assist light mode, the device can switch to flash mode from assist light mode directly when STR goes high if STR_MOD = 1 (see Figure 11). After the flash, the part operates in flash mode. MP3332 Assist Light Mode to Flash Mode: ILED1 ILED2 STR FL_TIMER Setting Time I2C REG 0x0C/D, I1_TOR=XXXX I2_TOR=XXXX REG 0x06/7, I1_FL=XXXX I2_FL=XXXX REG 0x01, LED_MOD=10 STR_MOD=1 STR_LV=1 REG 0x01, LED1_EN=1 LED2_EN=1 REG 0x03, FL_TIM=XXXX Reset, LED1_EN to 0 LED2_EN to 0 LED_MOD=00 REG 0x01, LED1_EN=1 LED2_EN=1 LED_MOD=10 STR_MOD=1 STR_LV=0 REG 0x03, FL_TIM=XXXX Reset, LED1_EN to 0 LED2_EN to 0 LED_MOD=00 Figure 11: Assist Mode to Flash Mode 5V DC Output Mode If 5V_MOD is set to 1, the device works in fixed 5V output mode, and the control loop is taken over by the voltage loop (see Figure 12). Note that the LED current source can still output a current if the mode conditions described above are met. Since the 5V DC directly powers the LED, care must be taken to ensure thermal conditions are normal. It is recommended to set the LED1/2_EN bit to 0 during 5V mode. MP3332 5V DC Mode: VOUT Switching Frequency Setting The maximum switching frequency can be selected by the SW_FS bits when operating in boost mode. 1M/2M/3M/4MHz can be selected to optimize efficiency. Switching Frequency Foldback In 4/3/2MHz switching mode, if the voltage across the current source is larger than the value set by the register bit VTH_PAS, the IC switches to 1MHz to improve efficiency and EMI. When FS_SD = 0, if the voltage across the current source is still larger than the value set by the register bits VTH_PAS in 1MHz mode, the switching frequency can be stretched down to 100kHz. If the input voltage continues rising or the load becomes lighter, the IC switches to pass mode from 100kHz. When FS_SD = 1, the IC switches directly to pass mode from 1MHz. Load Balancing To improve efficiency, the device provides a load balancing function to reduce unbalanced forward voltage drops between dual LEDs (see Figure 13). To enable this function, set the bit BAL_ON to 1. If VLED1 > VLED2 + VLED_HYS, the LED1 current drops step-by-step while the LED2 current rises step-by-step, and |VLED1VLED2| < VLED_HYS or ILED1 < 90% ILED2. The maximum adjustment range of each LED current is limited to 10%. Because of the limitation, if there is a large difference between VLED1 and VLED2, the load balance function cannot ensure |VLED1-VLED2| < VLED_HYS. It is recommended to further reduce the voltage difference. If VLED2 > VLED1 + VLED_HYS, the operation is the same. Without Load Balancing ILED1 With Load Balancing 4.35V, 2A ILED2 4.25V, 2A 1A 0.55V 1A 0.25V 3.8V 4.1V TOR +/-10% Max. Change 1.1A 0.35V 3.9V 0.9A 0.25V 4V I2C REG 0x01, 5V_MOD=1 REG 0x0C/D I1_TOR=XXXX I2_TOR=XXXX REG 0x01, LED_MOD=00 REG 0x01, LED1_EN=1 LED2_EN=1 Reset, LED1_EN to 0 LED2_EN to 0 REG 0x01, 5V_MOD=1 Figure 13: Load Balancing Figure 12: 5V DC Output Mode MP3332 Rev. 1.0 5/1/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 15 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE Current Reduction When the MP3332 works in flash mode, the output current may drop due to the following conditions: 3. Low Battery Voltage Threshold is Triggered The device provides low battery voltage protection in flash mode in the following ways: 1. TX is High TX is used to synchronize the RF transmission signal (see Figure 14). If TX goes high during flash mode, the flash current drops to the current set by I_TX in less than 5µs and sets the FT_TX bit to 1. If TX goes low, the current ramps up to the flash current again. 1. Before the flash, if VBL_SD = 1 and the input voltage is lower than the threshold set by VBL_RUN, the device remains disabled and sets the fault bit FT_VBATL to 1 (see Figure 15). Conversely, if VBL_SD = 0, the device ramps up to the current set by I_TX and sets the fault bit FT_VBATL to 1. The fault bit is cleared after it is read back or the input power is reset. MP3332 Software and Edge Sensitive Flash Mode w/ TX is Active: TX ILED1 ILED2 FL_TIMER I2C REG 0x01, STR_MOD=0 LED_MOD=11 REG 0x06/7, I1_FL=XXXX I2_FL=XXXX REG 0x08/9, I1_TX=XXXX I2_TX=XXXX REG 0x03, FL_TIM=XXXX REG 0x01, LED1_EN=1 LED2_EN=1 Reset, LED1_EN to 0 LED2_EN to 0 LED_MOD to 00 Figure 14: TX High 2. Input DC Current Limit is Triggered The MP3332 uses the input DC current limit protection to avoid drawing excessive current from the battery. Since the input current limit is sensed in the NMOS switch, it is effective only in boost mode. This current can be programmed by the IL_DC register from 1A to 4.2A. If the input current hits the input current limit threshold, the LED output current holds until the input current limit drops below the current limit threshold. The fault bit FT_IDC is set to 1 if the input current limit is triggered. The fault bit remains until it is read back, or the input power is reset. 2. During the flash pulse, if the battery voltage drops below the threshold set by VBL_RUN, the current reduces step-bystep until the battery voltage reaches the low battery voltage threshold. The minimum current caused by current reduction in the IFL_MIN register can be read back after the flash. The IFL_MIN value holds until the next flash occurs, or the power resets. At this condition, IFL_MIN can be read and used by system to set the flash current to ensure a stable flash current for next flash operation, which is MP3332 pre-flash function at low battery voltage. MP3332 Software and Edge Sensitive Flash Mode w/ TX is Active: Voltage drop due to ESR and Flash Voltage drop due to additional load VBAT VIN_L_RUN Pre-Flash Main-Flash IFLASH Setting value IFLASH Report min. IFLASH Adjust IFLASH Figure 15: Pre-Flash Operation MP3332 Rev. 1.0 5/1/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 16 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE NTC Detection If the register NTC_WD is set to enable NTC detection, the NTC sources a constant 35µA current. Connect the negative temperature coefficient (NTC) resistor between NTC and GND (see Figure 16). If the voltage across the NTC resistor (35µA*RNTC) drops below the threshold set by NTC_WD, the internal fault bit FT_LEDHOT is set to 1, and the modes are reset to standby mode if LEDT_SD = 1. If LEDT_SD = 0, the mode setting is not reset after the fault bit is set. The fault bit remains until it is read back, or the power is reset. Float NTC when the protection mode is not needed. NTC DEC RNTC Figure 16: NTC Detection VOUT-GND Short Protection If VOUT < 1V, the device stops switching and disconnects the synchronous PMOS to avoid drawing excessive current from the battery. Set the FT_VOSC bit to 1 and reset the mode setting. The fault bit remains until it is read back, or the power is reset. LED1/2-GND Short Protection If VLED1 < 1V and ILED1 > 5mA, or VLED2 < 1V and ILED2 > 5mA, the IC marks off the current source and sets the fault bit FT_LEDSC to 1, but continues switching. If both current sources are marked off, the device stops switching, and the mode setting is reset. The fault bit FT_LEDSC is 1 until it is read back, or the power is reset. If LED_EN1/2 is set to 0, the feedback of the current source 1/2 is not involved in the loop control, and the fault detection on this channel is disabled. LED1/2 Open Protection If VOUT-VLED1/2 < 100mV and VOUT > 5.5V, the fault current source is marked off, and the fault bit FT_OVP is set to 1, but continues switching. If both current sources are marked off, the device stops switching, and the mode setting is reset. The fault bit FT_OVP is 1 until it is read back, or the power is reset. If LED_EN1/2 is set to 0, the feedback of the current source 1/2 is not involved in the loop control, and the fault detection on this channel is disabled. Output Over-Voltage Protection (OVP) If VOUT > 5.5V, the device stops switching and resumes normal operation when VOUT drops below 5.2V. The fault bit FT_OVP is 1 until it is read back, or the power is reset. Junction Over-Temperature Protection (OTP) If Tj > 130°C, the flash current drops to the current set by I_TX if LED_OTAD = 1, and the fault bit FT_OTP is set. If Tj > 1°C, the device stops switching and resets the mode setting. The fault bit FT_OTP must be cleared to 0 by a read-back or power reset before restarting. Time-Out Protection If the device works in flash mode with hardware and level trigger enabled, the time-out protection is triggered when the STR pulse is longer than the time set by FL_TIM. The device stops switching and resets the mode setting bits when LED_SD = 0, and the fault bit FT_TO is 1 until it is read back, or the power is reset. Under-Voltage Lockout (UVLO) Protection If VIN drops below the UVLO threshold, the device stops and all of the registers are reset to default. I2C Interface Register Description I2C Chip Address After the start condition, the I2C compatible master sends a seven-bit address followed by an eighth read (Read: 1) or write (Write: 0) bit. The following bit indicates the register address to or from which the data is read or written. 0 MP3332 Rev. 1.0 5/1/2018 1 1 0 1 1 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. 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All Rights Reserved. 1 R/W 17 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE Register Map Add REG D7 D6 D5 D4 D3 D2 D1 D0 00H Chip ID DEV_ID4 DEV_ID3 DEV_ID2 DEV_ID1 DEV_ID0 REV_ID2 REV_ID1 REV_ID0 01H Mode STR_LV STR_MOD STR_POL LED1_EN LED2_EN LED_MOD1 LED_MOD0 5V_MOD 02H Peak Current NTC_WD2 NTC_WD1 NTC_WD0 IL_PEAK1 IL_PEAK0 FS_SD BAL_ON NA 03H Flash Timer FL_TIM3 FL_TIM2 FL_TIM1 FL_TIM0 LED_SD LEDT_SD SW_FS1 SW_FS0 04H Low Battery Voltage VBL_RUN2 VBL_RUN1 VBL_RUN0 VBL_SD IL_DC3 IL_DC2 IL_DC1 IL_DC0 05H Indicator LED_OTA D TUP_I2 TUP_I1 TUP_I0 VTH_PAS 1 VTH_PAS2 INDI_PWM1 INDI_PWM0 06H LED1 Flash Current I1_FL7 I1_FL6 I1_FL5 I1_FL4 I1_FL3 I1_FL2 I1_FL1 I1_FL0 07H LED2 Flash Current I2_FL7 I2_FL6 I2_FL5 I2_FL4 I2_FL3 I2_FL2 I2_FL1 I2_FL0 08H TX1 Current I1_TX7 I1_TX6 I1_TX5 I1_TX4 I1_TX3 I1_TX2 I1_TX1 I1_TX0 09H TX2 Current I2_TX7 I2_TX6 I2_TX5 I2_TX4 I2_TX3 I2_TX2 I2_TX1 I2_TX0 0AH Actual Flash IFL_ACT7 IFL_ACT6 IFL_ACT5 IFL_ACT4 IFL_ACT3 IFL_ACT2 IFL_ACT1 IFL_ACT0 0BH Minimum Flash IFL_MIN7 IFL_MIN6 IFL_MIN5 IFL_MIN4 IFL_MIN3 IFL_MIN2 IFL_MIN1 IFL_MIN0 0CH LED1 Torch I1_TOR7 I1_TOR6 I1_TOR5 I1_TOR4 I1_TOR3 I1_TOR2 I1_TOR1 I1_TOR0 0DH LED2 Torch I2_TOR7 I2_TOR6 I2_TOR5 I2_TOR4 I2_TOR3 I2_TOR2 I2_TOR1 I2_TOR0 0EH Fault Indication FT_VBATL FT_OVP FT_VOSC FT_LEDSC FT_OTP FT_TO FT_TX FT_IDC 0FH Fault Indication TBK1 TBK0 NA NA BAL_1AB2 BAL_2AB1 FT_LEDHOT FT_LEDOP MP3332 Rev. 1.0 5/1/2018 www.MonolithicPower.com MPS Proprietary Information. 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All Rights Reserved. 18 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE Table 2: Chip ID Register Addr: 0x00 Bit Bit Name Access Default Description 2:0 REV_ID R 001 Revision ID 7:3 DEV_ID R 00011 Device ID Table 3: Mode Setting Register Addr: 0x01 Bit Bit Name Access Default Description Flash mode trigger mode with strobe signal. 7 STR_LV RW 1 0 = edge trigger 1 = level trigger Strobe enable bit. 6 STR_MOD RW 1 0 = software enable 1 = hardware enable Strobe signal input active polarity. 5 STR_POL RW 1 0 = active low 1 = active high LED1 current source enable bit. 4 LED1_EN RW 0 0 = LED current source disable bit 1 = enable LED2 current source enable bit. 3 LED2_EN RW 0 0 = LED current source disable bit 1 = enable Device mode setting bits. 00 = torch mode 2:1 LED_MOD RW 00 01 = indicator mode 10 = assist light mode 11 = flash mode 5V DC output enable bit. 0 5V_MOD RW 0 0 = disable 1 = enable MP3332 Rev. 1.0 5/1/2018 www.MonolithicPower.com MPS Proprietary Information. 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All Rights Reserved. 19 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE Table 4: Peak Current Setting Register Addr: 0x02 Bit Bit Name Access Default Description NTC detection window. 7:5 NTC_WD RW 000 = disabled 000 001 = 0.6V; 010 = 0.67V; 011 = 0.74V; 111 = 1.02V; 0.07V/step 4:3 IL_PEAK RW Inductor current limit setting bits. 01 00 = 2A, 01 = 2.5A, 10 = 3.5A, 11 = 4.5A Disable the switching frequency stretching down from 1MHz if VIN is close to VOUT. 2 FS_SD RW 0 0 = enable Fsw stretch-down function 1 = disable Fsw stretch-down function LED load balance enable bit. 1 BAL_ON RW 0 0 = LED voltage mismatch auto-balance disabled 1 = LED voltage mismatch auto-balance enabled 0 NA RW NA Reserved Table 5: Flash Timer Setting Register Addr: 0x03 Bit Bit Name Access Default 7:4 FL_TIM RW 0001 Description Flash timer setting bits. 50ms to 800ms, 50ms/step. 0000 = 50ms; 0001 = 100ms; 1111 = 800ms LED_MOD and LED1/2_EN resetting control bit. 3 LED_SD RW 0 0 = reset LED_MOD and LED1/2_EN to default value after flash or torch 1 = no reset LED_MOD and LED1/2_EN resetting control bit when an NTC fault occurs. 2 LEDT_SD RW 0 0 = no reset and device continues 1 = reset and device stops 1:0 MP3332 Rev. 1.0 5/1/2018 SW_FS RW 00 Switching frequency setting bits. 00 = 4MHz; 01 = 3MHz; 10 = 2MHz; 11 = 1MHz www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 20 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE Table 6: Low Battery Voltage Setting Register Addr: 0x04 Bit 7:5 Bit Name VBL_RUN Access RW Default Description Low battery voltage setting bits. If VIN drops below this voltage during start-up, the current ramping stops. If the current is decreased during the flash current pulse until VIN is higher than its threshold, it works only in flash mode. 111 000 = 3V; 001 = 3.1V; 110 = 3.6V; 111 = disabled; 0.1V per step Action in low battery protection and flash mode. 4 VBL_SD RW 1 = device disabled when VIN is less than the threshold set by VBL_RUN before flash 1 0 = enable and current ramps up to current set by I_TX Input DC current limit setting bits. 1A to 4.2A. 3:0 IL_DC RW 0100 1A to 3A: 250mA/step, 0000 = 1A; 1000 = 3A; >3A: 300mA/step, 1001 = 3.3A, 1100 = 4.2A Table 7: Indicator Register Addr: 0x05 Bit Bit Name Access Default Description Adaptive thermal flash current control bit. 7 LED_OTAD RW 0 1 = current reduces to the current set by I_TX when Tj > 130°C 0 = disable 6:4 TUP_I 3:2 VTH_PAS RW RW 001 01 Current ramps up time per step. 000 = 8µs; 001 = 7µs, 111 = 1µs/step These two bits define the threshold when Fsw drops to 1MHz or switches to pass mode from boost mode. 00 = 300mV, 01 = 450mV, 10 = 600mV, 11 = 750mV 1:0 INDI_PWM MP3332 Rev. 1.0 5/1/2018 RW 00 PWM duty cycle of 31.5kHz in indicator mode. 00 = 2/16; 01 = 3/16; 10 = 4/16; 11 = 5/16 www.MonolithicPower.com MPS Proprietary Information. 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All Rights Reserved. 21 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE Table 8: LED1 Flash Current Setting Register Addr: 0x06 Bit Bit Name Access Default Description LED1 flash current setting bits. 0 to 1500mA, 5.88mA/step. 7:0 I1_FL RW 00110011 00000000 = 0mA, 11111111 = 1500mA (default 00110011 = 300mA) Table 9: LED2 Flash Current Setting Register Addr: 0x07 Bit Bit Name Access Default Description LED2 flash current setting bits. 0 to 1500mA, 5.88mA/step. 7:0 I2_FL RW 00110011 00000000 = 0mA, 11111111 = 1500mA (default 00110011 = 300mA) Table 10: LED1 TX Current Setting Register Addr: 0x08 Bit Bit Name Access Default Description Defines the flash current in flash mode if TX is high. 0 to 1500mA, 5.88mA/step. 7:0 I1_TX RW 00110011 00000000 = 0mA, 11111111 = 1500mA (default 00110011 = 300mA) Table 11: LED2 TXM Current Setting Register Addr: 0x09 Bit Bit Name Access Default Description Defines the flash current in flash mode if TX is high. 0 to 1500mA, 5.88mA/step. 7:0 I2_TX RW 00110011 00000000 = 0mA, 11111111 = 1500mA (default 00110011 = 300mA) MP3332 Rev. 1.0 5/1/2018 www.MonolithicPower.com MPS Proprietary Information. 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All Rights Reserved. 22 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE Table 12: Actual Flash LED Current Register Addr: 0x0A Bit Bit Name Access Default 7:0 IFL_ACT R 00000000 Description The actual flash current in flash mode. 0 to 1500mA, 5.88mA/step. 00000000 = 0mA, 11111111 = 1500mA Table 13: Minimum Flash LED Current Register Addr: 0x0B Bit 7:0 Bit Name IFL_MIN Access R Default 00000000 Description The minimum flash current caused by a low battery voltage current reduction in flash mode. 0 to 1500mA, 5.88mA/step. 00000000 = 0mA, 11111111 = 1500mA Table 14: LED1 Torch Current Setting Register Addr: 0x0C Bit Bit Name Access Default Description LED1 torch current setting bits. 0 to 1500mA, 5.88mA/step. 7:0 I1_TOR RW 00010101 00000000 = 0mA, 11111111 = 1500mA (default 00010101 = 123mA) Table 15: LED2 Torch Current Setting Register Addr: 0x0D Bit Bit Name Access Default Description LED2 torch current setting bits. 0 to 1500mA, 5.88mA/step. 7:0 I2_TOR RW 00010101 00000000 = 0mA, 11111111 = 1500mA (default 00010101 = 123mA) MP3332 Rev. 1.0 5/1/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 23 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE Table 16: Fault Indication Register Addr: 0x0E Bit Bit Name Access Default Description 7 FT_VBATL R 0 Low battery voltage fault bit. 0 = no fault. 1 = fault. 6 FT_OVP R 0 Output over-voltage fault bit. 0 = no fault. 1 = fault. 5 FT_VOSC R 0 VOUT-GND short fault bit. 0 = no fault. 1 = fault. 4 FT_LEDSC R 0 LED short fault bit. 0 = no fault. 1 = fault. 3 FT_OTP R 0 Junction over-temperature fault bit. 0 = no fault. 1 = fault. 2 FT_TO R 0 Flash time-out flag bit. 0 = no fault. 1 = flash timer is triggered with hardware and level-trigger modes. 1 FT_TX R 0 TX flag bit. 0 = no fault. 1 = TX is pulled high. 0 FT_IDC R 0 Input DC current limit fault bit. 0 = no fault. 1 = fault. Table 17: Fault Indication Register Addr: 0x0F Bit Bit Name Access Default Description Blinking time setting bits in indicator mode. TBK [0-1] = 00, no blinking, LED constant on TBK [0-1] = 01, Tblink = 128ms (default) TBK [0-1] = 10, Tblink = 256ms TBK [0-1] = 11, Tblink = 512ms 7:6 TBK0-1 R/W 01 5:4 NA R NA 3 BAL_1AB2 R 0 2 BAL_2AB1 R 0 1 FT_LEDHOT R 0 NTC fault bit. 0 = no fault. 1 = fault. 0 FT_LEDOP R 0 LED open fault bit. 0 = no fault. 1 = fault. MP3332 Rev. 1.0 5/1/2018 Reserved. 1 = VLED1> = VLED2 + 125mV 0 = VLED1 < VLED2 + 125mV 1 = VLED2> = VLED1 + 125mV 0 = VLED2 < VLED1 + 125mV www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 24 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE APPLICATION INFORMATION Selecting the Input Capacitor The input capacitor reduces the surge current drawn from the input supply and the switching noise from the device. The input capacitor impedance at the switching frequency should be less than the input source impedance to prevent the high-frequency switching current from passing through to the input. Ceramic capacitors with X5R or X7R dielectrics are recommended because of their low ESR and small temperature coefficients. A capacitor with a higher value is recommended to reduce input voltage ripple and noise. For most applications, a 10μF ceramic capacitor is sufficient. Selecting the Inductor The converter requires an inductor to supply a higher output voltage while being driven by the input voltage. A larger value inductor generates less ripple current, resulting in a lower peak inductor current and less stress on the internal Nchannel MOSFET. However, the larger value inductor has a larger physical size, a higher series resistance, and a lower saturation current. Choose an inductor that does not saturate under the worst-case load conditions. Select the minimum inductor value to ensure that the boost converter works in continuous conduction mode (CCM) with high efficiency and good EMI performance. Selecting the Output Capacitor The output capacitor keeps the output voltage ripple small and ensures feedback loop stability. The output capacitor impedance must be low at the switching frequency. Ceramic capacitors with X7R dielectrics are recommended because of their low ESR characteristics. Care must be taken to ensure that the ceramic capacitance is dependent on the voltage rating since the DC bias voltage and the value can lose as much as 50% of its capacitance at its rated voltage rating. Please leave enough of a voltage rating margin when selecting the component, as a capacitance that is too low causes loop instability. For most applications, a 10μF ceramic capacitor is sufficient. PCB Layout Guidelines Efficient PCB layout is critical for stable operation. For best results, refer to Figure 17 and follow the guidelines below. 1. Place the input capacitor as close to VIN as possible. 2. Use wider copper traces for the input, output, and GND connecting wire to improve thermal performance. 3. Place the GND via as close to the output and input capacitor as possible to improve thermal performance. The required inductance value can be calculated with Equation (1) and Equation (2): L η VOUT D (1 D)2 2 fSW ILOAD D 1 VIN VOUT (1) (2) Where VIN and VOUT are the input and output voltages, fSW is the switching frequency, ILOAD is the LED load current, and η is the efficiency. The switching current is used for the peak current mode control. To avoid hitting the current limit, the worst-case inductor peak current should be less than 80% of the current limit (ILIM). For most applications, a 0.47µH~2µH inductor is sufficient. OUT LED1 LED1 OUT SW PGND LED2 LED2 OUT SW PNGD TOR TX STR VSS NTC SDA SCL VIN GND IN Figure 17: Recommended Layout MP3332 Rev. 1.0 5/1/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 25 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE TYPICAL APPLICATION CIRCUITS Figure 18: Dual Channel Application Circuit Figure 19: Single LED Application Circuit MP3332 Rev. 1.0 5/1/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 26 MP3332 – DUAL-CHANNEL FLASH LED DRIVER WITH I2C INTERFACE PACKAGE INFORMATION WLCSP-16 (1.7mmx1.7mm) NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MP3332 Rev. 1.0 5/1/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 27