MP3216 36V, 1.3MHz, 0.75A Step-up Converter With Output Disconnect The Future of Analog IC Technology DESCRIPTION FEATURES The MP3216 is a monolithic step up converter integrating a 0.75A, 0.6Ω internal switch. The MP3216 uses current mode, fixed frequency architecture to regulate the output voltage, providing fast transient response and cycle by cycle current limit. • • • • • • • • • The MP3216 includes under-voltage lockout, over voltage protection and thermal overload protection preventing damage in the event of an output overload. In addition, the MP3216 can disconnect all loads from input DC power supply. The output short circuit protection prevents the Schottky diode and IC from damage. The MP3216 is available in small 6-pin TSOT23 package. Internal 0.6Ω Power MOSFET Up to 36V Output Voltage 1.3MHz Fixed Switching Frequency 42V Over Voltage Shutdown Cycle-by-Cycle Over Current Protection UVLO, Thermal Shutdown Output Disconnection Output Short Protection Available in TSOT23-6 Packages APPLICATIONS • • • Portable Applications Handheld Computers and PDAs Digital Still Cameras 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 90 Efficiency vs. Output Current EFFICIENCY (%) 80 70 60 50 40 30 20 MP3216 Rev. 0.92 12/25/2013 0 2 4 6 8 10 12 14 16 18 20 OUTPUT CURRENT (mA) www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 1 MP3216 –36V, 1.3MHz STEP-UP CONVERTER WITH A 0.75A SWITCH ORDERING INFORMATION Part Number* Package Top Marking Free Air Temperature (TA) MP3216DJ TSOT23-6 6H -40°C to +85°C * For Tape & Reel, add suffix –Z (e.g. MP3216DJ–Z); For RoHS Compliant Packaging, add suffix –LF (e.g. MP3216DJ–LF–Z) PACKAGE REFERENCE TOP VIEW SW 1 6 L GND 2 5 IN FB 3 4 EN ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance SW Pin..........................................-0.5V to +40V All Other Pins ...............................-0.3V to +6.5V (2) Continuous Power Dissipation (TA = +25°C) .......................................................... 0.56 W Junction Temperature ...............................150°C Lead Temperature ....................................260°C Storage Temperature............... -55°C to +150°C TSOT23-6 ..............................220 .... 110 .. °C/W Recommended Operating Conditions (3) IN Supply Voltage ..............................2.5V to 6V SW Pin ................................................VIN to 36V Maximum Junction Temp. (TJ) ................+125°C MP3216 Rev. 0.92 12/25/2013 (4) θJA θ JC 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. © 2013 MPS. All Rights Reserved. 2 MP3216 –36V, 1.3MHz STEP-UP CONVERTER WITH A 0.75A SWITCH ELECTRICAL CHARACTERISTICS VIN = VEN = 5V, TA = +25°C, unless otherwise noted. Parameters Symbol Operating Input Voltage Supply Current (Shutdown) Supply Current (Quiescent) Switching Frequency Maximum Duty Cycle Under Voltage Lockout IN Under Voltage Lockout Under Voltage Lockout Hysteresis Over Voltage Shutdown Threshold Enable EN OFF Threshold EN ON Threshold Feedback FB Voltage FB Input Bias Current Output Switch SW On-Resistance SW Current Limit Condition VIN Min fSW VFB = 0V VOV Max Units 550 1.3 6 10 650 1.5 V µA µA MHz % 2.25 2.45 V 2.5 VEN = 0V VFB = 0.15V UVLO Typ 1.0 92 VIN Rising VOV Rising VEN Falling VEN Rising mV 42 V 0.8 2 1.20 VFB = 1.2V Duty Cycle = 60% 600 0.75 mΩ A Thermal Shutdown 150 °C Output Disconnect Switch N-CH On-Resistance Inrush Current Limit 300 0.21 mΩ A RON VL<(VIN-0.3V) www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 1.28 V V 1.24 70 MP3216 Rev. 0.92 12/25/2013 VFB 92 V nA 3 MP3216 –36V, 1.3MHz STEP-UP CONVERTER WITH A 0.75A SWITCH PIN FUNCTIONS Pin # Name 1 SW 2 GND 3 FB Feedback Input. Reference voltage is 1.24V, Connect a resistor divider from the output to this pin. 4 EN ON/OFF Control Input. A voltage greater than 2V will turn the part on and less than 0.8V will turn the part off. When not used, tie EN to the input source for automatic startup. 5 IN Input Supply Pin. IN is the drain of the internal disconnecting N-channel MOSFET. Must be locally bypassed. 6 L Inductor Output Pin. L is the source/body of the internal disconnecting N-channel MOSFET. Connect the inductor to this pin. MP3216 Rev. 0.92 12/25/2013 Pin Function Power Switch Output. SW is the drain of the internal MOSFET switch. Connect the power inductor and output rectifier to SW. Ground. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 4 MP3216 –36V, 1.3MHz STEP-UP CONVERTER WITH A 0.75A SWITCH TYPICAL PERFORMANCE CHARACTERISTICS Circuit on page 9, VIN=5V, VOUT=33V, TA=+25˚C, unless otherwise noted. MP3216 Rev. 0.92 12/25/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 5 MP3216 –36V, 1.3MHz STEP-UP CONVERTER WITH A 0.75A SWITCH TYPICAL PERFORMANCE CHARACTERISTICS (continued) Circuit on page 9, VIN=5V, VOUT=33V, TA=+25˚C, unless otherwise noted. MP3216 Rev. 0.92 12/25/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 6 MP3216 –36V, 1.3MHz STEP-UP CONVERTER WITH A 0.75A SWITCH OPERATION The MP3216 uses a constant frequency, peak current mode boost regulator architecture to regulate the output voltage. The operation of the MP3216 can be understood by referring to the block diagram of Figure 1. 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. 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. Over voltage protection shuts off the MP3216 if the output voltage goes too high. In some cases, loose high side resistor or improper divided resistor; this results in the feedback voltage is always below reference. The part runs at maximum duty cycle boosting the output voltage higher and higher. If the output ever exceeds 42V, the part shuts down. And It does not switch again until the power is recycled. The voltage at the output of the error amplifier is an amplified version of the difference between the 1.24V reference voltage and the feedback voltage. In this way the peak current level keeps the output in regulation. The MP3216 also has output short protection function. When short condition occurs, switching stops and internal disconnecting NMOSFET limits the inductor current to 210mA, which prevents the freewheel diode and IC from damaging. Once short condition is released, the system returns to normal operation. IN L M2 INTERNAL REGULATOR CP ENABLE& REFERENCE CONTROL Figure 1—Functional Block Diagram MP3216 Rev. 0.92 12/25/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 7 MP3216 –36V, 1.3MHz STEP-UP CONVERTER WITH A 0.75A SWITCH APPLICATION INFORMATION Components referenced below apply to Typical Application Circuit on page 9. − ) B VF × T U 1 R B F = V OV ( 2 R Setting the Output Voltage Set the output voltage by selecting the resistive voltage divider ratio. Use 5.1kΩ for the low-side resistor R2 of the voltage divider. Determine the high-side resistor R1 by the equation: Where, VOUT is the output voltage, VFB = 1.24V. For R2 = 5.1kΩ and VOUT = 33V, then R1 = 130.6kΩ. There choose a 133kΩ standard 1% value. Selecting the Input Capacitor An input capacitor is required to supply the AC ripple current to the inductor, while limiting noise at the input source. This capacitor must have low ESR, so ceramic is the best choice. Use an input capacitor value of 4.7µF or greater. This capacitor must be placed physically close to the IN pin. Since it reduces the voltage ripple seen at IN, it also reduces the amount of EMI passed back along that line to the other circuitry. To minimize the ripple to the inductor, use a smaller ceramic capacitor value of 0.1µF placed physically close to the L pin. ⎞ ⎟× ⎠ D A O E L P P I VR MP3216 Rev. 0.92 12/25/2013 ⎛ ⎜ ≈⎝ IL W fS T N U 2 V IV OC 1 Selecting the Output Capacitor The output capacitor is required to maintain the DC output voltage. Low ESR capacitors are preferred to keep the output voltage ripple to a minimum. The characteristic of the output capacitor also affects the stability of the regulation control system. Ceramic, tantalum, or low ESR electrolytic capacitors are recommended. In the case of ceramic capacitors, the impedance of the capacitor at the switching frequency is dominated by the capacitance, and so the output voltage ripple is mostly independent of the ESR. The output voltage ripple is estimated to be: Where VRIPPLE is the output ripple voltage, VIN and VOUT are the DC input and output voltages respectively, ILOAD is the load current, fSW is the switching frequency, and C2 is the capacitance of the output capacitor. Selecting the Inductor The inductor is required to force the higher output voltage while being driven by the lower input voltage. A larger value inductor results in less ripple current that results in lower peak inductor current, reducing stress on the internal power switch. However, the larger value inductor has a larger physical size, higher series resistance, and/or lower saturation current. Inductance from 2.2µH to 33µH is a good choice for high efficiency and small size. To prevent saturation, use an inductor with a saturation current rating that is higher than the device current limit. Selecting the Diode The output rectifier diode supplies current to the inductor when the internal power MOSFET is off. To reduce losses due to diode forward voltage and recovery time, use a Schottky diode with the MP3216. The diode should be rated for a reverse voltage equal to or greater than the output voltage used. The average current rating must be greater than the maximum load current expected, and the peak current rating must be greater than the peak inductor current. Layout Consideration High frequency switching regulators require very careful layout for stable operation and low noise. All components must be placed as close to the IC as possible. Keep the path between the SW pin, output diode, output capacitor and GND pin extremely short for minimal noise and ringing. The input capacitor must be placed close to the IN pin for best decoupling. All feedback components must be kept close to the FB pin to prevent noise injection on the FB pin trace. The ground return of the input and output capacitors should be tied close to the GND pin. See the MP3216 demo board layout for reference. × www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 8 MP3216 –36V, 1.3MHz STEP-UP CONVERTER WITH A 0.75A SWITCH TYPICAL APPLICATION CIRCUIT VIN 5V c5 NC c1 4.7uF/16V c3 0.1uF 5 IN GND R5 NC EN R6 51k D1 B0540 c2 L 6 1 SW MP3216 4 EN GND 2 R4 NC FB R1 133k 3 R3 30k 0.47uF/50V c6 NC c4 NC Vout 33V/10mA GND R2 5.1k Figure 2—VIN=5V VOUT=33V IOUT=10mA Boost Circuit MP3216 Rev. 0.92 12/25/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 9 MP3216 –36V, 1.3MHz STEP-UP CONVERTER WITH A 0.75A SWITCH PACKAGE INFORMATION TSOT23-6 0.95 BSC 0.60 TYP 2.80 3.00 6 4 1.20 TYP 1.50 1.70 1 2.60 3.00 2.60 TYP 3 TOP VIEW RECOMMENDED LAND PATTERN 0.84 0.90 1.00 MAX 0.09 0.20 SEATING PLANE 0.30 0.50 0.95 BSC 0.00 0.10 SEE DETAIL "A" FRONT VIEW SIDE VIEW NOTE: GAUGE PLANE 0.25 BSC 0o-8o DETAIL 揂 0.30 0.50 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. 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. MP3216 Rev. 0.92 12/25/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 10