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MP3306 30V, 700kHz Synchronous Step-Up White LED Driver

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  • 日期: 2018-11-28
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标签: MP3306驱动器LED

The MP3306 is a step-up converter designed for driving white LEDs from 3V to 12V power supply. The MP3306 uses current mode, fixed frequency architecture to regulate the LED current, which is measured through an external high-side current sense resistor. The low 202mV feedback voltage and synchronous rectification reduces power loss and improves efficiency. 

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6DAKJKHABC16ADCO DESCRIPTION The MP3306 is a stepup converter designed for driving white LEDs from 3V to 12V power supply The MP3306 uses current mode fixed frequency architecture to regulate the LED current which is measured through an external highside current sense resistor The low 202mV feedback voltage and synchronous rectification reduces power loss and improves efficiency The MP3306 is turned off if an overvoltage condition is present due to an open circuit condition The ou......

6DA.KJKHAB)=C1+6A?DCO DESCRIPTION The MP3306 is a step-up converter designed for driving white LEDs from 3V to 12V power supply. The MP3306 uses current mode, fixed frequency architecture to regulate the LED current, which is measured through an external high-side current sense resistor. The low 202mV feedback voltage and synchronous rectification reduces power loss and improves efficiency. The MP3306 is turned off if an over-voltage condition is present due to an open circuit condition. The output disconnect feature allows the output to be completely discharged. The MP3306 includes under-voltage lockout, current limiting, output short protection and thermal overload protection. The MP3306 is available in small 12-pin QFN (2mm x 2mm) package. MP3306 30V, 700kHz Synchronous Step-Up White LED Driver FEATURES • 3V~12V Input Voltage • Analog Dimming and PWM Dimming • Output-to-Input Disconnect in Shutdown Mode • Programmable Open Load Shutdown • Output Short Protection • Low 202mV Feedback Voltage with +/-3% accuracy • UVLO, Thermal Shutdown • Available in 2mm x 2mm QFN12 Package APPLICATIONS • Smart Phone, MID, PDA • Digital Still Cameras • Small LCD Displays All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION L1 C 3 VIN G N D EN PM WI L IN C 1 M P3306 EN PW MI VC C SW B ST O U T FB G N D C 4 PW MO O VP C 5 R 1 LED 1 LED 6 C 2 R 2 R 3 MP3306 Rev.1.0 3/6/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. www.MonolithicPower.com 1 MP3306----30V 700kHz SYNCHRONOUS STEP-UP WHITE LED DRIVER ORDERING INFORMATION Part Number* Package Top Marking MP3306EG QFN12 (2x2mm) 3Y * For Tape & Reel, add suffix –Z (e.g. MP3306EG–Z). For RoHS Compliant packaging, add suffix –LF (e.g. MP3306EG–LF–Z) PACKAGE REFERENCE L 12 BS T 11 IN V C C E N 1 2 3 P W M I 4 5 6 10 O U T 9 8 7 S W G N D FB P W M O O V P ABSOLUTE MAXIMUM RATINGS (1) VSW, VOUT, VFB....................................-0.5V to 35V VBST................................. ..................... VSW +6V VIN, VL, ............................................ -0.5V to 14V VEN, VOVP, VPWMI, VPWMO, VCC ........... -0.3V to 6.5V Continuous Power Dissipation (TA = +25°C) ………………………………………………....1.6W Storage Temperature ............... -55°C to +150°C (2) Recommended Operating Conditions IN Supply Voltage VIN ........................ 3V to 12V Vsw ................................................ -0.5V to 30V Operating Junct. Temp (TJ) ...... -40°C to +125°C (3) Thermal Resistance QFN12 (2 x 2mm) ................... 80 ...... 16 ... °C/W θJC θJA (4) 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-to- ambient 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 will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects from permanent damage. the device 3) The device is not guaranteed to function outside of its operating conditions. 4) Measured on JESD51-7, 4-layer PCB. MP3306 Rev.1.0 3/6/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. www.MonolithicPower.com 2 MP3306----30V 700kHz SYNCHRONOUS STEP-UP WHITE LED DRIVER ELECTRICAL CHARACTERISTICS VIN = VEN = 5V, TA = +25°°°°C, all voltages with respect to GND, unless otherwise noted. Parameters Symbol Condition Min Typ Max Units Operating Input Voltage VCC Voltage Supply Current (Shutdown) Supply Current (Quiescent) Switching Frequency Maximum Duty Cycle Under Voltage Lockout VIN VVCC ISD IQS fSW DMAX VIN > 5.5V, VEN = 3V VEN = 0V VEN = 5V, VOUT - VFB = 0.5V VFB = VOUT IN Under Voltage Lockout UVLO VIN Rising Under Voltage Lockout Hysteresis Protection OVP Threshold SW Current Limit (5) Thermal Shutdown (5) Enable EN OFF Threshold EN ON Threshold Dimming PWMI Low Threshold PWMI High Threshold PWMI Input Frequency Minimum PWMO Dimming Threshold Maximum PWMO Dimming Threshold Feedback FB Voltage FB Input Bias Current Disconnect Switch On-Resistance (5) Output Switch High-Side NMOS On-Resistance (5) Low-Side NMOS On-Resistance(5) Notes: 5) Guaranteed by design VOVP-TH Duty Cycle = 60% VENLO VENHI VEN Falling VEN Rising VPWMI-LO VPMWI Falling VPWMI-HI VPMWI Rising FPWMI VPWMO-MIN VFB = VOUT VPWMO-MAX VOUT-VFB = 0.2V VFB IFB VEN = 3V VEN = 3V RND-ON RNH-ON RNL-ON 3 3.7 300 550 2.5 3.9 0.1 380 690 93 2.7 130 12 4.1 1 460 830 2.9 1.18 1.22 1.26 1.8 150 0.6 0.8 0.1 25 850 1.1 1.2 50 V V µA µA kHz % V mV V A °C V V V V kHz mV mV 196 202 208 mV 3 7 0.5 0.6 0.6 11 µA Ω Ω Ω MP3306 Rev.1.0 3/6/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. www.MonolithicPower.com 3 MP3306----30V 700kHz SYNCHRONOUS STEP-UP WHITE LED DRIVER PIN FUNCTIONS Pin # Name Pin Function 1 2 3 IN Input Supply Pin. It provides the power for internal driver and logic circuit. Must be locally bypassed. VCC The Internal Linear Regulator Output. VCC provides power supply for the internal MOSFET switch gate driver and the internal control circuitry .Bypass VCC to GND with a ceramic capacitor. EN EN Control Input. A voltage greater than 1.1V turns the part on and less than 0.6V turns the part off. 4 PWMI Apply a PWM signal on this pin for brightness control. This signal is uniformed and filtered at PWMO pin with an internal 100kΩ resistance. With a capacitor at PWMO pin, the duty cycle from 0% to 100% at PWMI pin is converted to 0V to 1.2V DC voltage at PWMO pin. 5 PWMO PWM Filter Output. Connect a capacitor from PWMO to GND. The voltage on this pin range 0V to 1.2V linearly controls the feedback voltage from 0V to 0.2V. To use PWM dimming, connect the PWM input signal to PWMI pin. To use analog dimming, connect the analog input voltage to PWMO pin. 6 OVP Over Voltage Protection Pin. Use one external resistor voltage divider to program OVP threshold. When the OVP pin voltage reaches the shutdown threshold 1.22V, the IC will be turned off and latch up until EN is toggled again. 7 8 9 FB Feedback Input. The MP3306 regulates the voltage across the current sense resistor between FB and VOUT. Connect a current sense resistor from VOUT to the LED string. Connect the anode of the LED string to FB. The regulation voltage is 202mV. GND Ground. OUT The OUTPUT terminal. Connect the output cap on this pin, the output capacitor must be ceramic type and be placed as short as possible between OUT pin and GND pin. 10 SW Power Switch Node. SW is the drain of the internal low side MOSFET switch. Connect the power inductor to SW. 11 BST Bootstrap. A capacitor is connected between SW and BST pins to form a floating supply to drive the high side MOSFET. 12 L Power input pin. L is the source of internal disconnection MOSFET. Connect the inductor to this pin. MP3306 Rev.1.0 3/6/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. www.MonolithicPower.com 4 MP3306----30V 700kHz SYNCHRONOUS STEP-UP WHITE LED DRIVER TYPICAL PERFORMANCE CHARACTERISTICS VIN=5V, VEN=5V, 8 LEDs in series, 20mA, unless otherwise noted. Efficiency Steady State VIN = 3V EN Startup 94 92 90 88 86 84 82 80 78 2 4 6 8 10 12 14 V IN (V) EN Shutdown VSW 10V/div. VEN 5V/div. IL 100mA/div. ILED 20mA/div. VSW 10V/div. VOU T 10V/div. VOV P 500mV/div. ILED 20mA/div. VSW 10V/div. VOU T 10V/div. IINDUC TOR 200mA/div. VSW 10V/div. VOUT 10V/div. VPWM 5V/div. ILED 20mA/div. VSW 10V/div. VOU T 10V/div. IL 500mA/div. IOU T 200mA/div. VSW 10V/div. VEN 5V/div. IL 100mA/div. ILED 20mA/div. VSW 10V/div. ILED 10mA/div. VOUT 5V/div. VPWM 5V/div. VSW 10V/div. VOU T 10V/div. IL 100mA/div. ILED 20mA/div. MP3306 Rev.1.0 3/6/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. www.MonolithicPower.com 5
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