MP3351DQ-LF-P

MP3351 60V, 2A Integrated Photo Flash Charger With IGBT Driver The Future of Analog IC Technology DESCRIPTION FEATURES The MP3351 is a fast, highly efficient, precision high voltage photo-flash charger with integrated IGBT driver for xenon flash applications. The programmable peak current from 300mA to 2A. A 200mΩ internal power switch minimizes the conduction loss. 60V maximum output voltage lowers the transformer turns ratio and improves switching loss associated with the primary leakage inductance. External feedback provides 3% charge accuracy. • • • • • The MP3351 is available in a 16-pin 3mm x 3mm QFN package Integrated 60V, 200mΩ Power Switch Operates from a Single or Duel-Cell Li+ Battery 2A peak current w/resistor program 3% Charge Accuracy Integrated IGBT Driver APPLICATIONS • • • • Digital Still Cameras Optical Film Cameras Mobile Phones With Camera PDAs With Camera “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION T1 VBATT 1.3V-9V Single or Dual Cell Battery VOUT + - 3-6V VIN ISET 1 3, 6 SW 12, 13 7, 8 RDYB PGND 15 2, 4 GND MP3351 IGBTIN 14 16 9 10, 11 N/C MP3351 Rev. 0.91 9/2/2008 FB IGBT CHARGE 5 IGBTOUT www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 MPS. All Rights Reserved. 1 MP3351 – 60V, 2A INTEGRATED PHOTO FLASH CHARGER WITH IGBT DRIVER ABSOLUTE MAXIMUM RATINGS (1) PACKAGE REFERENCE 16 15 14 13 1 12 2 11 3 10 4 9 5 6 7 VIN to GND ........................................ -0.3V to 6V CHARGE, ISET, IGBTIN, RDYB to GND..-0.3V to 6V FB to GND ........................................ -0.3V to 6V SW to GND ..................................... -0.3V to 60V Maximum Operating Frequency .............400kHz Operating Temperature Ranges ....-40°C to +85°C Storage Temperature ...............-55°C to +150°C Junction Temperature.............................+150°C Lead Temperature (Solder) ....................+260°C Thermal Resistance (2) θJA θJC QFN16 (3mm x 3mm) ............. 50 ...... 12... °C/W 8 Notes: 1) Exceeding these ratings may damage the device. 2) Measured on approximately 1” square of 1 oz copper. Part Number* Package Temperature MP3351DQ QFN16-3 –40°C to +85°C * For Tape & Reel, add suffix –Z (eg. MP3351DQ–Z) For RoHS compliant packaging, add suffix –LF (eg. MP3351DQ–LF–Z) ELECTRICAL CHARACTERISTICS (VIN=V (CHARGE)=3.3V, TA = +25°C, unless otherwise noted.) Parameter Photoflash Capacitor Charger VIN Voltage Range VIN UVLO VIN Quiescent Current VIN Quiescent Current Shutdown Current from VIN VSW Leakage Current SW ON resistance between SW and GND Charge Input High Voltage Charge Input Low Voltage Pull-down resistance of CHARGE pin IPEAK1 IPEAK2 Charge completion detect voltage at FB FB input bias current I(FB) DCM Comparator threshold MP3351 Rev. 0.91 9/2/2008 Conditions Rising edge, hysteresis = 200mV V(CHARGE)=High, V(SW) = 0, free run by TONMAX V(CHARGE)=High, V(FB) = 1.3V V(CHARGE)=Low, VIN =3.3V VIN=3.3V,VSW=60V, in Shutdown Min 3 2.7 Typ Max Unit 2.8 6 2.9 V V 2.5 5 mA 1 2 µA µA µA 50 Switch turn-on 0.2 Ω 2.4 0.6 V(CHARGE)=3.3V RSET=43.1kΩ RSET=100kΩ With 1.2KΩ (1%) connected to FB 100 V V kΩ 1.08 0.3 1.20 0.5 1.32 0.7 A A 1.176 1.20 1.224 V 25 0.2 35 µA mV -0.2 15 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 MPS. All Rights Reserved. 2 MP3351 – 60V, 2A INTEGRATED PHOTO FLASH CHARGER WITH IGBT DRIVER ELECTRICAL CHARACTERISTICS (continued) (VIN=V (CHARGE)=3.3V, TA = +25°C, unless otherwise noted.) Parameter Conditions RDYB Leakage Current V(RDYB)=3.3V RDYB Output Low Voltage ISINK= 2mA MAX TON Maximum TON time Thermal Shutdown IGBT Driver IGBTOUT pull-up ON resistance Rising edge, Hysteresis = 15oC Min Max Unit 1 µA 0.2 50 80 V 120 C 4 Ω 4 Ω 2.4 V IGBTIN Input Low Voltage 0.6 Propagation delay µs o 150 IGBTOUT pull-down ON resistance IGBTIN Input High Voltage Typ V IGBTIN rising/falling edge to IGBTOUT rising/falling edge, CGATE=6500pF 45 ns IGBTOUT rise time CGATE=6500pF 60 ns IGBTOUT fall time CGATE=6500pF 70 ns 100K Ω Pull down resistance of IGBTIN PIN FUNCTIONS Pin# 1 2, 4 Name ISET GND 3, 6 VIN 5 IGBTOUT PGND, Exposed Pad 7, 8 9 CHARGE 12, 13 14 SW IGBTIN 15 RDYB 16 FB MP3351 Rev. 0.91 9/2/2008 Description Peak Current Set Input. The peak current is 5 X104 the current flow out of this pin. Analog Ground. Tie it directly to local ground plane. Input Supply Pin. Connect it to system supply voltage. Bypass VIN to GND with a 0.1uF or greater ceramic capacitor. Output Drive for IGBT Gate. Connect this pin to the gate of the IGBT. Power Ground. Ground connection for the power switch. Connect Exposed Pad to PGND. Charge Enable Pin. A low to high transition on this pin puts the part into power delivery mode. Once the target voltage is reached, the part will stop charging the output. Toggle this pin will start charging again. Bring this pin low will terminate the power delivery and put the part in shutdown. Switch Pin. This is the drain of the internal power switch. Logic Input Pin for IGBT Drive. Open-Drain Power-Ready Output. RDYB becomes low when the output voltage is reached. Feedback Pin. Its trip voltage is 1.2V. www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 MPS. All Rights Reserved. 3 MP3351 – 60V, 2A INTEGRATED PHOTO FLASH CHARGER WITH IGBT DRIVER TYPICAL PERFORMANCE CHARACTERISTICS VOUT = 300V, ISET = 2A, TA = +25ºC, unless otherwise noted. 50 100 150 200 250 300 2 3 4 5 6 7 3 4 5 6 7 2 3 4 5 6 7 1 0 MP3351 Rev. 0.91 9/2/2008 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 MPS. All Rights Reserved. 4 MP3351 – 60V, 2A INTEGRATED PHOTO FLASH CHARGER WITH IGBT DRIVER TYPICAL PERFORMANCE CHARACTERISTICS (continued) VOUT = 300V, ISET = 2A, TA = +25ºC, unless otherwise noted. Flash MP3351 Rev. 0.91 9/2/2008 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 MPS. All Rights Reserved. 5 MP3351 – 60V, 2A INTEGRATED PHOTO FLASH CHARGER WITH IGBT DRIVER BLOCK DIAGRAM IGBT OUT Figure 1—Functional Block Diagram MP3351 Rev. 0.91 9/2/2008 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 MPS. All Rights Reserved. 6 MP3351 – 60V, 2A INTEGRATED PHOTO FLASH CHARGER WITH IGBT DRIVER APPLICATION INFORMATION MP3351 controlled flyback charger operates in critical conduction mode with peak current set by ISET pin. Output voltage is divided down through R1, R2 and R3 from the positive terminal of the transformer secondary and compares with 1.20V at FB pin. The low to high transition of CHARGE pin will enable the flyback converter to switch. A minimum TOFF of 20µS provides a minimum OFF time at the beginning of charging when DCM comparator always trips because VOUT is still near zero, Min TOFF will be reduced to 400nS after VO>16V. Charger may enter DCM mode when charge is close to full and actual OFF time is less than minimum TOFF. Circuit will stop switching and RDYB will be pulled low once the flash capacitor is charged to 300V, a value set by R1, R2 and R3. When the part is ready the internal dissipation is reduced to just the circuits for IGBT driver. Toggle CHARGE pin will start charge again. Bringing CHARGE pin low terminates the power delivery and put the part in shutdown. A maximum TON timer prevents pulling current from starved power source. If the ON time exceeds maximum TON, the switch is forced OFF regardless of IPEAK detection. Integrated IGBT driver uses VIN as its power supply. DCM Comparator DCM boundary is reached when V(FB) drops to zero. The DCM comparator compares V(FB) and a fixed offset voltage of 25mV to account for the comparator delay. Charge Speed The output capacitor determined by: TCHARGE ∝ charging ILIM 1 N + VIN VOUT speed is Setting Peak Charge Current MP3351’s peak charge current (ISET) can be set by an external resistor, RSET from the ISET pin to ground. The value of RSET can be calculated from: 50 RSET (KΩ ) = ISET (A) For example, for 2A peak charge current, RSET is 24.9kΩ. Primary Inductance The primary inductance is calculated based on the minimum off time period: LPRIMARY ≥ VOUT TMIN,OFF NIPEAK VOUT: output voltage about 300V TMIN, OFF: Minimum off time 400nsec. IPEAK: primary peak current Turns Ratio The minimum turns ratio transformer is obtained as: of the flyback VOUT VDS − VIN VDS: FET drain-source voltage VIN: Input voltage 3~5V N≥ Setting Output Voltage The output voltage is set by selecting the resistive voltage divider ratio. If we use 1.2k For the low side resistor (R3) of the voltage divider, we can determine the high side resistor (R1, R2) by the equation: 1 VOUT − VFB R3 2 VFB are R1=R2=150kΩ R1 = R2 = Typical values R3=1.2kΩ. and Output Diode Selection The reverse voltage of the output diode is determined by: VD = VOUT + NVIN MP3351 Rev. 0.91 9/2/2008 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 MPS. All Rights Reserved. 7 MP3351 – 60V, 2A INTEGRATED PHOTO FLASH CHARGER WITH IGBT DRIVER PACKAGE INFORMATION QFN16-3 (EXPOSED PAD) 2.90 3.10 1.50 1.80 0.30 0.50 PIN 1 ID MARKING 0.18 0.30 2.90 3.10 PIN 1 ID INDEX AREA 13 16 12 PIN 1 ID SEE DETAIL A 1 1.50 1.80 0.50 BSC 4 9 5 8 TOP VIEW BOTTOM VIEW PIN 1 ID OPTION A 0.30x45” TYP. PIN 1 ID OPTION B R0.20 TYP. 0.80 1.00 0.20 REF 0.00 0.05 DETAIL A SIDE VIEW 2.90 NOTE: 1.70 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-220, VARIATION VEED-4. 5) DRAWING IS NOT TO SCALE. 0.70 0.25 0.50 RECOMMENDED LAND PATTERN NOTICE: The information in this document is subject to change without notice. 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. MP3351 Rev. 0.91 9/2/2008 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 MPS. All Rights Reserved. 8