MP3302DJ

MP3302 MPS | Alldatasheet

Document overview

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Technical content

MP3302 40V, 1.3A, Single-cell Step-up White LED Driver with Single Wire Dimming Control MP3302 Rev. 0.98 www.MonolithicPower.com 1 5/5/2010 MPS Proprietary Information. Unaut horized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. The Future of Analog IC Technology

DESCRIPTION

The MP3302 is a step-up converter designed for driving arrays of WLEDS from a single cell Lithium Ion battery. The MP3302 uses 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 MP3302 is turned off if an over-voltage condition is present due to an open circuit condition. The MP3302 includes under-voltage lockout, current limiting and thermal overload protection preventing damage in the event of an output overload. The MP3302 is available in small 5-pin TSOT23 and 8-pin QFN (2mm x 3mm) packages.

FEATURES

• Internal Power MOSFET
• Drives up to 10 Series White LEDs
• Up to 87% Efficiency
• Single Wire Dimming Control
• 1.3MHz Fixed Switching Frequency
• Open Load Shutdown
• Low 200mV Feedback Voltage
• UVLO, Thermal Shutdown
• Internal 1.3A Current Limit
• Available in TSOT23-5 and 2mm x 3mm QFN8 Packages

APPLICATIONS

• 5” ~ 7” LCD Panels
• Handheld Computers and PDAs
• Digital Still Cameras
• Small LCD Displays “Monolithic Power Systems”, “MPS”, and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION MP3302 VIN 3.3V - 6V Enable/ Dimming Control LED1 LED2 LED3 LED25 LED26 LED27 IN EN GND FB SW String 1 String 9... EFFICIENCY (%) 4 56 INPUT VOLTAGE(V)

3 WLEDs,9 Strings

MP3302 –40V, 1.3A, SINGLE-CELL STEP-UP WHITE LED DRIVER WITH SINGLE WIRE DIMMING CONTROL MP3302 Rev. 0.98 www.MonolithicPower.com 2 5/5/2010 MPS Proprietary Information. Unaut horized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved.

ORDERING INFORMATION

Part Number Package Top Marking Free Air Temperature (TA) MP3302DJ* TSOT23-5 N6 –40°C to +85°C MP3302DD** QFN8 (2mm x 3mm) N7 –40°C to +85°C * For Tape & Reel, add suffix –Z (e.g. MP3302DJ–Z); For RoHS Compliant Packaging, add suffix –LF (e.g. MP3302DJ–LF–Z). ** For Tape & Reel, add suffix –Z (e.g. MP3302DD–Z); For RoHS Compliant Packaging, add suffix –LF (e.g. MP3302DD–LF–Z) PACKAGE REFERENCE TOP VIEW GND IN NC EN SW NC FB GND Exposed Pad Connect to GND TSOT23-5 QFN8 (2mm x 3mm) ABSOLUTE MAXIMUM RATINGS (1) Continuous Power Dissipation…(T A = +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 θJA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by P D (MAX) = (T J (MAX)-TA)/θJA. Exceeding the maximum allowable powe r dissipation will cause excessive die temperature, and the regulator will 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 approximately 1” square of 1 oz copper. SW GND FB IN EN TOP VIEW

MP3302 –40V, 1.3A, SINGLE-CELL STEP-UP WHITE LED DRIVER WITH SINGLE WIRE DIMMING CONTROL MP3302 Rev. 0.98 www.MonolithicPower.com 3 5/5/2010 MPS Proprietary Information. Unaut horized Photocopy and Duplication Prohibited. © 2010 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 V IN 2.5 6 V Supply Current (Shutdown) V EN = 0V 4 8 µA Supply Current (Quiescent) V FB = 0.15V 690 850 µA Switching Frequency f SW 1.0 1.3 1.5 MHz Maximum Duty Cycle V FB = 0V 92 % Under Voltage Lockout IN Under Voltage Lockout UVLO V IN Rising 2.25 2.45 V Under Voltage Lockout Hysteresis 92 mV Open Lamp Shutdown Threshold VOV V OV Rising 40 42 44 V Enable EN OFF Threshold V EN Falling 0.4 V EN ON Threshold V EN Rising 0.6 V Minimum EN Dimming Threshold V FB = 0V 0.655 0.7 0.845 V Maximum EN Dimming Threshold V FB = 0.2V 1.275 1.4 1.425 V Feedback FB Voltage V EN = 1.5V 185 200 215 mV FB Input Bias Current V FB = 0.1V -600 -300 nA Output Switch SW On-Resistance (5) R ON 0.5 Ω SW Current Limit (5) Duty Cycle = 60% 1.33 A Thermal Shutdown (5) 150 °C Notes: 5) Guaranteed by design.

MP3302 –40V, 1.3A, SINGLE-CELL STEP-UP WHITE LED DRIVER WITH SINGLE WIRE DIMMING CONTROL MP3302 Rev. 0.98 www.MonolithicPower.com 4 5/5/2010 MPS Proprietary Information. Unaut horized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. PIN FUNCTIONS TSOT23-5 Pin # QFN8 Pin # Name Pin Function 1 8 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 1, 5 GND, Exposed Pad Ground. Connect exposed pad to GND plane for proper thermal performance. 3 6 FB Feedback Input. The MP3302 regulates the voltage across the current sense resistor 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 4 EN ON/OFF Control and Dimming Command Input. A voltage greater than 0.6V will turn the part on and less than 0.4V will turn the part off. If the EN pin voltage is between 0.7V and 1.4V, VFB is regulated between 0V and 200mV. To use PWM dimming, apply a 200Hz to 1KHz square wave signal with amplitude greater than 1.5V to this pin. 5 2 IN Input Supply Pin. Must be locally bypassed. 3 NC No Connect.

MP3302 –40V, 1.3A, SINGLE-CELL STEP-UP WHITE LED DRIVER WITH SINGLE WIRE DIMMING CONTROL MP3302 Rev. 0.98 www.MonolithicPower.com 5 5/5/2010 MPS Proprietary Information. Unaut horized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS VIN = 5V, 3WLEDs 9Strings, unless otherwise noted. VSW 10V/div. VEN 2V/div. VOUT 5V/div. VEN 2V/div. VEN 5V/div. VOUT 5V/div. ILED 100mA/div. Enable Startup VSW 10V/div. ILED 100mA/div. VEN 5V/div. VOUT 5V/div. VSW 10V/div. ILED 100mA/div. Enable Shutdown PWM Dimming VSW 20V/div. VOUT 20V/div. Start Up into Openload VSW 10V/div. VFB 50mV/div. VOUT AC Coupled 100mV/div. Iinductor 500mA/div. 400ns/div. Steady State Operation VIN = 5V, 3 WLEDs,9 Strings VIN = 5V, 3 WLEDs,9 StringsVIN = 5V, 3 WLEDs,9 Strings V IN = 5V VIN = 5V, 3 WLEDs,9 Strings f=1kHzVIN=5V, 3 WLEDs, 9 Strings VIN=5V, 3 WLEDs, 9 Strings 0 0.2 0.4 0.8 1 PWM DIMMING DUTY Output Current vs PWM Dimming Duty 200 180 160 140 120 100 OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 0.60 200 180 160 140 120 100 EN PIN VOLTAGE (V) Output Current vs Analog Dimming Voltage EFFICIENCY (%) 4 56 INPUT VOLTAGE(V)

6 WLEDs

8 WLEDs

MP3302 –40V, 1.3A, SINGLE-CELL STEP-UP WHITE LED DRIVER WITH SINGLE WIRE DIMMING CONTROL MP3302 Rev. 0.98 www.MonolithicPower.com 6 5/5/2010 MPS Proprietary Information. Unaut horized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. OPERATION The MP3302 uses a constant frequency, peak current mode boost regulator architecture to regulate the series string of white LEDs. The operation of the MP3302 can be understood by referring to the block diagram of Figure 1. At the start of each oscillator cycle the FET is turned on through the control circuitry. To prevent sub-harmonic oscillations at duty cycles greater than 50 percent, a stabilizing ramp is added to the output of the current sense amplifier and the result is fed into the positive input of the PWM comparator. When this voltage equals the output voltage of the error amplifier the power FET is turned off. The voltage at the output of the error amplifier is an amplified version of the difference between the 200mV reference voltage and the feedback voltage. In this way the peak current level keeps the output in regulation. If the feedback voltage starts to drop, the output of the error amplifier increases. This results in more current flowing through the power FET, thus increasing the power delivered to the output. PWM COMPARATOR AMPLIFIER 200mV for Full Brightness Enable CONTROL LOGIC CURRENT SENSE AMPLIFIER SWM1 GND- FB EN 1.3MHz OSC ENABLE & DIMMING CONTROL Figure 1—Functional Block Diagram

MP3302 –40V, 1.3A, SINGLE-CELL STEP-UP WHITE LED DRIVER WITH SINGLE WIRE DIMMING CONTROL MP3302 Rev. 0.98 www.MonolithicPower.com 11 5/5/2010 MPS Proprietary Information. Unaut horized Photocopy and Duplication Prohibited. © 2010 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 0.50 0o-8o

0.25 BSC

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

MP3302 –40V, 1.3A, SINGLE-CELL STEP-UP WHITE LED DRIVER WITH SINGLE WIRE DIMMING CONTROL NOTICE: The information in this document is subject to change wi thout notice. Users should warra nt and guarantee that third party Intellectual Property rights are not infringed upon w hen integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MP3302 Rev. 0.98 www.MonolithicPower.com 12 5/5/2010 MPS Proprietary Information. Unaut horized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. QFN8 (2mm x 3mm) SIDE VIEW TOP VIEW BOTTOM VIEW 2.90 3.10 1.90 2.10 0.00 0.05 PIN 1 ID MARKING 1.70 0.50 0.25 RECOMMENDED LAND PATTERN

2.90 NOTE:

1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH. 3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETER MAX. 4) DRAWING CONFORMS TO JEDEC MO-229, VARIATION VCED-2. 5) DRAWING IS NOT TO SCALE. 1.60 0.70 PIN 1 ID OPTION B R0.20 TYP. DETAIL A PIN 1 ID INDEX AREA 1.65 1.85 1.50 1.70 0.50 BSC 0.18 0.30 PIN 1 ID SEE DETAIL A 0.30 0.50 0.80 1.00

0.20 REF

0.30x45” TYP.