MP3301

MP3301 MPS | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 11

Technical content

MP3301 1.3MHz, 700mA, Fixed-Frequency Step-Up Driver for up to 10 White LEDS MP3301 Rev. 1.01 www.MonolithicPower.com 1 10/28/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved.

DESCRIPTION

The MP3301 is a step-up converter designed to drive WLEDS arrays from a single-cell, lithium-ion battery. The MP3301 uses a current-mode, fixed- frequency architecture to regulate the LED current, which is measured through an external current sense resistor. Its low 200mV feedback voltage reduces power loss and improves efficiency. The MP3301 turns off in the presence of an open-circuit over-voltage condition. The MP3301 includes under -voltage lockout, current limiting, and thermal-overload protection to prevent damage in the event of an output overload. The MP3301 is available in a small 5-pin TSOT23 package.

FEATURES

 Internal Power MOSFET  Drives up to 10 White LEDs in Series  Up to 89% Efficiency  PWM and Analog Dimming  1.3MHz Fixed Switching Frequency  Low 200mV Feedback Voltage  Internal 700mA Current Limit  Open-Load Shutdown  UVLO, Thermal Shutdown  Available in TSOT23-5 Packages

APPLICATIONS

 Smart Phones  Digital Still Cameras  Small LCDs All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Quality Assurance. “Monolithic Power Systems”, “MPS”, and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION VIN MP3301 En/Dim L D Cin Cout Rsense IN SW FB GND EN LED

MP3301—1.3MHZ, 700MA, FIXED-FREQUENCY, STEP-UP DRIVER FOR WHITE LEDS MP3301 Rev. 1.01 www.MonolithicPower.com 2 10/28/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved.

ORDERING INFORMATION

MP3301GJ* TSOT23-5 * For Tape & Reel, add suffix –Z (e.g. MP3301GJ–Z); PACKAGE REFERENCE TSOT23-5 ABSOLUTE MAXIMUM RATINGS (1) Continuous Power Dissipation .. (TA = +25°C) (2) Recommended Operating Conditions (3) Thermal Resistance (4) 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 T J (MAX), the junction -to- ambient thermal resistance θ JA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calc ulated by P D (MAX) = (T J (MAX)-TA)/θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Inter nal 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 approximately 1” square of 1 oz copper.

MP3301—1.3MHZ, 700MA, FIXED-FREQUENCY, STEP-UP DRIVER FOR WHITE LEDS MP3301 Rev. 1.01 www.MonolithicPower.com 3 10/28/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved.

ELECTRICAL CHARACTERISTICS

VIN = VEN = 5V, TA = +25°C, unless otherwise noted. Parameters Symbol Condition Min Typ Max Units Operating Input Voltage VIN 2.5 6 V Supply Current (Shutdown) VEN = 0V 10 µA Supply Current (Quiescent) VFB = 0.15V 900 µA Switching Frequency fSW 1.0 1.3 1.5 MHz Maximum Duty Cycle VFB = 0V 92 % Under Voltage Lockout IN Under-Voltage Lockout UVLO VIN Rising 2.25 2.45 V Under-Voltage Lockout Hysteresis 92 mV Open-Lamp Shutdown Threshold VOV VOV Rising 40 42 44 V Enable EN OFF Threshold VEN Falling 0.4 V EN ON Threshold VEN Rising 0.6 V Minimum EN Dimming Threshold VFB = 0V 0.655 0.7 0.845 V Maximum EN Dimming Threshold VFB = 0.2V 1.275 1.4 1.425 V Feedback FB Voltage VEN = 1.5V 200 mV FB Input Bias Current VFB = 0.1V -600 nA Output Switch SW On-Resistance (5) RON 0.5 Ω SW Current Limit (5) Duty Cycle = 60% 1.0 A Thermal Shutdown (5) 150 °C Notes: 5) Guaranteed by design.

MP3301—1.3MHZ, 700MA, FIXED-FREQUENCY, STEP-UP DRIVER FOR WHITE LEDS MP3301 Rev. 1.01 www.MonolithicPower.com 4 10/28/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. PIN FUNCTIONS Pin # Name Pin Function 1 SW Power Switch Output. SW is the drain of the internal MOSFET switch. Connect the power inductor and output rectifier to SW. SW can swing between GND and 36V. 2 GND Ground. Connect exposed pad to GND plane for improved thermal performance. 3 FB Feedback Input. Used to regulate the voltage across the current -sense r esistor between FB and GND. Connect a current -sense resistor from the bottom of the LED string to GND. Connect the bottom of the LED string to FB. The regulation voltage is 200mV. 4 EN ON/OFF Control and Dimming Command Input. A > 0.6V turns the part on, and < 0.4V turns the part off. If the EN pin voltage is between 0.7V and 1.4V, V FB is regulated between 0V and 200mV. To use PWM dimming, apply a 200Hz-to-1kHz square wave signal with an amplitude >1.5V. 5 IN Input Supply Pin. Requires local bypassing.

MP3301—1.3MHZ, 700MA, FIXED-FREQUENCY, STEP-UP DRIVER FOR WHITE LEDS MP3301 Rev. 1.01 www.MonolithicPower.com 5 10/28/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS VIN = 3.8V, VEN=3.3V, 8 WLEDs in series, 20mA, unless otherwise noted.

MP3301—1.3MHZ, 700MA, FIXED-FREQUENCY, STEP-UP DRIVER FOR WHITE LEDS MP3301 Rev. 1.01 www.MonolithicPower.com 6 10/28/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. OPERATION The MP3301 uses a constant -frequency, peak- current–mode, boost-regulator architecture to regulate up to 10 white LEDs in series. Figure 1 shows how the MP3301 operates. The MP3301 regulates the SW voltage through the feedback voltage and the 1.3MHz oscillator. At the start of each oscillator cycle , the control circuitry turns the FET on. A stabilizing ramp added to the output of the current sense amplifier prevents sub-harmonic oscillations at duty cycles >50%: The ramp output goes to the positive input of the PWM comparator : When this voltage equals the error amplifier output (the amplified difference betwe en the 200mV reference voltage and the feedback voltage ), the power FET turns off. When the feedback voltage starts to drop, the output of the error amplifier increases , thus increasing the current flowing through the power FET. The increased FET power results in increased power delivered to the output. Figure 1: Functional Block Diagram

MP3301—1.3MHZ, 700MA, FIXED-FREQUENCY, STEP-UP DRIVER FOR WHITE LEDS MP3301 Rev. 1.01 www.MonolithicPower.com 10 10/28/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. Figure 7: Circuit to Drive 10 WLEDs in Series with <3V Input Voltage Use the additional bias circuit to improve the MOSFET ON-resistance at low input voltage.

MP3301—1.3MHZ, 700MA, FIXED-FREQUENCY, STEP-UP DRIVER FOR WHITE LEDS NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third party I ntellectual Property r ights are not infringe d upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MP3301 Rev. 1.01 www.MonolithicPower.com 11 10/28/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved.

PACKAGE INFORMATION

0.30 0.50 SEATING PLANE

0.95 BSC

0.84 0.90 1.00 MAX 0.00 0.10 TOP VIEW FRONT VIEW SIDE VIEW RECOMMENDED LAND PATTERN 2.80 3.00 1.50 1.70 2.60 3.00 1 3 0.09 0.20 NOTE: 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH, PROTRUSION OR GATE BURR. 3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. 4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.10 MILLIMETERS MAX. 5) DRAWING CONFORMS TO JEDEC MO-193, VARIATION AA. 6) DRAWING IS NOT TO SCALE. 0.30 0.500o-8o

0.25 BSC

2.60 TYP 1.20 TYP 0.95 BSC 0.60 TYP SEE DETAIL "A" DETAIL “A”