MP3214DQ-LF-Z

MP3214 500mA LED Camera Flash Charge Pump The Future of Analog IC Technology DESCRIPTION FEATURES The MP3214 is a low noise, high current charge pump designed to drive LEDs at up to 500mA with an input supply of 2.7 to 5.5 volts. The high efficiency and low external parts count (two small bypass caps, two small charge pump caps, and one programming resistor) make the MP3214 ideally suited for portable applications where small size and high efficiency are critical. • • • • • • • • • • The MP3214 controls the inrush current via a soft start algorithm. High frequency switching of the charge pump capacitors allows for very small capacitance values. The output current is set by an external resistor, RSET. The brightness of the LED can be modulated by a PWM on the enable pin. The MP3214 automatically adjusts the switching mode of the charge pump for optimal efficiency. The MP3214 is available in a 16 pin 3x3mm QFN package. High Efficiency Up to 500mA Output Current Wide Supply Range of 2.7V to 5.5 V Small Solution Size Soft Start Low Shutdown Current Open/Short Led Protection No Inductors Programmable Output Current PWM Brightness Control APPLICATIONS • • • • LED Backlight LED Flash LED Torch/Flashlight Cell Phones, Cameras, PDA, and Handheld Equipment 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 MP3214 Rev. 1.01 6/24/2011 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 1 MP3214 – 500mA LED CAMERA FLASH CHARGE PUMP ORDERING INFORMATION Part Number* MP3214DQ Package QFN16 (3 x 3mm) Top Marking Free Air Temperature (TA) 2F -40°C to +85°C * For Tape & Reel, add suffix –Z (g. MP3214DQ–Z). For RoHS compliant packaging, add suffix –LF (e.g. MP3214DQ–LF–Z) PACKAGE REFERENCE TOP VIEW PIN 1 ID NC 16 IOUT IOUT 15 14 NC 13 CP 1 12 NC C2B 2 11 ISET C1B 3 10 TOE C1A 4 9 GND 5 6 7 8 GND C2A VIN EN EXPOSED PAD CONNECT TO PIN 5, 9 ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance All Other Pins ...............................-0.3V to +6.5V (2) Continuous Power Dissipation (TA = +25°C) ………………………………………………....2.1W Junction Temperature ...............................150°C Lead Temperature ....................................260°C Storage Temperature............... -65°C to +150°C Supply Voltage VIN............................2.5V to 6V QFN16 (3 x 3mm) ...................60 ...... 12 ... °C/W Recommended Operating Conditions (2) Supply Voltage VIN ..........................2.7V to 5.5V Maximum Junction Temp. (TJ) ................+125°C MP3214 Rev. 1.01 6/24/2011 (3) 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 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 JESD51-7, 4-layer PCB. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 2 MP3214 – 500mA LED CAMERA FLASH CHARGE PUMP ELECTRICAL CHARACTERISTICS VBATT = 3.6V, C1=C2=2.2μF, COUT=4.7μF, CBYPASS=1μF, TA = +25°C, unless otherwise noted. Parameter Input Supply Voltage Supply Current Shutdown Current ILED Drop Out Voltage LED Current Turn On Delay Clock Frequency En Threshold High En Threshold Low IOUT Gain Accuracy Gain Coefficient Thermal Shutdown Symbol VIN IIN ISHUTDOWN Condition IOUT Measured with RSET=17.8k IOUT =Gain/RSET Min 2.7 186 -8% Typ 3 0.1 0.3 4 1.35 0.81 0.75 202 3600 150 Max 5.5 218 +8% Units V mA µA V µs MHz V V mA V °C Note: 5) Current matching definition: (Max – Min)/(Max + Min) 6) Guaranteed by design. MP3214 Rev. 1.01 6/24/2011 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 3 MP3214 – 500mA LED CAMERA FLASH CHARGE PUMP PIN FUNCTIONS Pin # Name Description 1 CP 2 C2B 3 C1B 4 C1A 5,9 Charge pump bypass for common anode version. Connect a 2.2µF bypass capacitor to GND. GND Battery Power Ground. Connect the exposed pad to this pin. 6 C2A 7 VIN 8 EN 10 TOE 11 ISET 12,13,16 NC 14,15 Charge Pump Capacitor #2 Negative Node. Connect the negative side of the #2 charge pump capacitor to C2B. Charge Pump Capacitor #1 Negative Node. Connect the negative side of the #1 charge pump capacitor to C1B. Charge Pump Capacitor #1 Positive Node. Connect the positive side of the #1 charge pump capacitor to C1A. Typical applications require C1 to be 1µF. Charge Pump Capacitor #2 Positive Node. Connect the positive side of the #2 charge pump capacitor to C2A. Typical applications require C2 to be 1µF. Battery Power Input. Connect the 2.5V to 5.5V input source between BATT and GND. Bypass BATT to GND with a 2.2µF or greater capacitor. Enable input. Time Out Enable. With TOE=1 the time out is enabled. The device will keep operating for a period of time after the EN pin goes low. Current Control Input. Connect a resistor between ISET and GND to set the LED current up to 500mA. No connection. Driver for Flashlight. Connect the flashlight LED between this pin and BATT, with the anode IOUT at BATT. BLOCK DIAGRAM Figure 1—Functional Block Diagram MP3214 Rev. 1.01 6/24/2011 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 4 MP3214 – 500mA LED CAMERA FLASH CHARGE PUMP TYPICAL PERFORMANCE CHARACTERISTICS Flash Current Regulation vs. Battery Voltage: 100 IFlash=100mA IFlash=200mA EFFICIENCY(%) 90 IFlash=300mA IFlash=500mA 80 70 60 50 40 30 2.0 4.0 5.0 3.0 V_BATTERY(V) FLASH CURRENT VARIATION(%) Efficiency 6.0 0.0 -0.05 -0.10 -0.15 -0.20 -0.25 2.5 2.9 3.3 3.7 4.1 4.5 4.9 5.3 5.7 V_BATTERY(V) 230 210 190 170 150 130 110 90 70 50 V_Battery=2.7V 30 V_Battery=3.5V 10 10 20 30 40 50 60 70 80 90 100 DUTY CYCLE(%) MP3214 Rev. 1.01 6/24/2011 Measurement 550 500 450 I_FLASH(MA) AVERAGE FLASH CURRENT(MA) Average Flash Current vs. Dimming Duty Cycle 400 350 300 250 200 150 100 0.02 0.04 0.06 0.08 0.1 0.12 0.14 1/RSET(1/KOHM) www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 5 MP3214 – 500mA LED CAMERA FLASH CHARGE PUMP TYPICAL PERFORMANCE CHARACTERISTICS Charge Pump Charge Pump Start up and Shut down Vin=3.5V, I_LED =500mA, 1.5X mode Vin=2.7V, I_LED =500mA, 2.0X mode Start up at 1X Mode, V_BAT=4.2V V_C1A 2V/div V_C1B 2V/div V_C2A 2V/div V_C2B 2V/div V_C1A 2V/div EN 2V/div V_C1B 2V/div V_CP 1V/div V_C2A 2V/div V_C2B 2V/div I_Flash 200mA/div Start up and Shut down Start up and Shut down Start up and Shut down Shut down at 1X Mode, V_BAT=4.2V Start up at 1.5X Mode, V_BAT=3.5V Shut down at 1.5X Mode, V_BAT=3.5V EN 2V/div EN 2V/div EN 2V/div V_CP 1V/div V_CP 1V/div V_CP 1V/div I_Flash 200mA/div I_Flash 200mA/div I_Flash 200mA/div Start up and Shut down Start up and Shut down Start up at 2X Mode, V_BAT=2.7V Shut down at 2X Mode, V_BAT=2.7V EN 2V/div EN 2V/div V_CP 1V/div V_CP 1V/div Mode 1.5X to 1X retry V_CP 1V/div V_C1A 2V/div I_BAT 500mA/div I_Flash 200mA/div MP3214 Rev. 1.01 6/24/2011 I_Flash 200mA/div V_C1B 2V/div www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 6 MP3214 – 500mA LED CAMERA FLASH CHARGE PUMP TYPICAL PERFORMANCE CHARACTERISTICS Mode change from 1X to 1.5 V_CP 2V/div V_CP 2V/div V_C1A 2V/div V_C1A 2V/div I_BAT 500mA/div I_BAT 500mA/div V_C1B 2V/div V_C1B 2V/div MP3214 Rev. 1.01 6/24/2011 Mode change from 1.5X to 2X www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 7 MP3214 – 500mA LED CAMERA FLASH CHARGE PUMP OPERATION Using the Enable Pin to PWM the LED Current The Enable (En) pin can enable (logic 1) or disable (logic 0) the part. When disabled, the part enters a low current sleep mode. There is an internal one shot on the enable pin. The enable pin must go low for more than 30mS in order to completely disable the part and enter the low current shutdown mode. Although the part internally does not immediately shut off, the output drive to the LED does immediately turn off. A low frequency PWM on the enable pin (50Hz to 2kHz) can be used to change the LED brightness. For example, if a 20% duty cycle PWM signal is applied to the enable pin, the average output current is 20% the full current. Setting the Output Current The output current is set by the resistor RSET. RSET is connected from the ISET pin to ground. The output current follows the equation: IOUT = 3570 RSET or for a desired IOUT, RSET is calculated by: RSET = 3570 IOUT For example: RSET 7140Ω 8925Ω 11900Ω 17850Ω 35700Ω MP3214 Rev. 1.01 6/24/2011 IOUT 500mA 400mA 300mA 200mA 100mA Charge Pump Operation Normal battery operation will supply a voltage that is initially high (roughly 4.2volts when fully charge) falling to a mid voltage for much of it’s life ( roughly 3 to 3.6 volts) and finally dropping to a low voltage (roughly 2.7 to 3.0 volts) when fully discharged. At the high end of the battery voltage, the LED can be driven directly from the battery to ground. As the battery discharges, the voltage must be boosted to allow enough forward voltage to turn on the LED. On the MP3214, the boost voltage pushes the charge pump output (CP) below ground to gain the required headroom. The charge pump gain can be changed on the fly to optimize the charge pump voltage for maximum efficiency. The gain can be configured to be 1, 1.5 or 2. The charge pump gain control is accomplished automatically by an internal feedback network. Time Out Enable The TOE function acts to extend the device operation, for a period of time, after the enabled pin goes low. With TOE=1 the time out is enabled. When the enable pin goes high, the part turns on as in normal operation. When the enable pin goes low, the part and the output, remain on for an extra 1.55 seconds. When TOE=0, the enabled pin functions directly bases on the logic level of the input. The part turns on when enable is high, and off when enable is low. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 8 MP3214 – 500mA LED CAMERA FLASH CHARGE PUMP PACKAGE INFORMATION QFN16 (3 x 3mm) 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. MP3214 Rev. 1.01 6/24/2011 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 9