MP3410DJ-LF-Z

MP3410 1.3A, 550kHz Synchronous Rectified Step-up Converter The Future of Analog IC Technology DESCRIPTION FEATURES The MP3410 is a highly efficient, synchronous, fixed frequency, current-mode step-up converter with output to input disconnect, inrush current limiting and internal soft-start. It includes an error amplifier, ramp generator, comparator, N-Channel switch and P-Channel synchronous rectified switch (which greatly improves efficiency). The output disconnect feature allows the output to be completely isolated from the input in shutdown mode. • • • • • • • • • • The 550kHz switching frequency allows for smaller external components producing a compact solution for a wide range of load currents. The internal compensation and soft-start minimizes the external component count and limits the inrush current during startup. The MP3410 has integrated power MOSFET which can support up to 6V output and typical 1.3A switch current. The MP3410 is offered in a thin SOT23-5 package. Over 90% Efficiency Output to Input Disconnect at Shutdown Mode Internal Synchronous Rectifier Inrush Current Limiting and Internal Soft-Start Internal Compensation 1.3A Typical Switch Current Limit 550kHz Fixed Switching Frequency Zero Current Shutdown Mode Thermal Shutdown 5-Pin TSOT-23 Package APPLICATIONS • • • • • MP3 Players Handheld Computers and PDAs Digital Still and Video Cameras External Modems Small LCD Displays 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 100 VIN 1.8V - 3.2V Efficiency vs Load Current VIN=3.6V 90 EN 5 EN OUT 3 MP3410 GND 2 FB 1 VOUT 3.3V 400mA EFFICIENCY (%) 4 SW 80 60 50 VOUT=5V 40 30 MP3410 Rev. 1.12 6/30/2011 VIN=2.4V 70 10 100 LOAD CURRENT (mA) www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 1000 1 MP3410 — 1.3A, 550kHz SYNCHRONOUS RECTIFIED STEP-UP CONVERTER ORDERING INFORMATION Part Number* MP3410DJ Package TSOT23-5 Top Marking Free Air Temperature (TA) P3 -40°C to +85°C * For Tape & Reel, add suffix –Z (e.g. MP3410DJ–Z) For RoHS compliant packaging, add suffix –LF (e.g. MP3410DJ–LF–Z) PACKAGE REFERENCE TOP VIEW FB 1 GND 2 OUT 3 5 EN 4 SW TSOT23-5 ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance All Pins .........................................-0.3V to +6.5V (2) Continuous Power Dissipation (TA = +25°C) ........................................................... 0.47W Storage Temperature............... -65°C to +150°C TSOT23-5.............................. 220 .... 110.. °C/W Recommended Operating Conditions (3) Supply Voltage VIN .............................1.8V to 6V Output Voltage VOUT ...........................2.5V to 6V Maximum Junction Temp. (TJ) .............. +125°C MP3410 Rev. 1.12 6/30/2011 (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 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 board. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 2 MP3410 — 1.3A, 550kHz SYNCHRONOUS RECTIFIED STEP-UP CONVERTER ELECTRICAL CHARACTERISTICS VEN = VOUT = 3.3V, TA = +25°C, unless otherwise noted. Parameter Symbol Condition Startup Supply Voltage VST Output Voltage Range VOUT ILOAD = 0mA Min Typ Max 1.5 1.6 1.8 RLOAD = 50Ω 1.65 2.5 Supply Current (Shutdown) VEN = VOUT =0V, VSW = 5V 0.15 Supply Current VFB = 1.3V 360 Feedback Voltage VFB Feedback Input Current 1.15 VFB = 1.19V 1.19 Units V 6.0 V 0.5 μA μA 1.23 50 V nA Switching Frequency fSW 410 550 690 KHz Maximum Duty Cycle DMAX 80 90 95 % 0.4 V EN Input Low Voltage EN Input High Voltage (see Chart EN high voltage vs Input for details) VIN =1.8V 1.05 VIN =3.3V 1.65 VIN =5V 2.15 EN Pull Down Resistor Low-Side On Resistance (5) RONLS Low-Side Current Limit High-Side On Resistance Thermal Shutdown VOUT = 3.3V ILIM (5) RONHS (5) Thermal Shutdown Hysteresis (5) VOUT = 3.3V V 1 mΩ 300 mΩ 1.3 A 530 700 mΩ 160 °C 30 °C Note: 5) Guaranteed by design, not tested. MP3410 Rev. 1.12 6/30/2011 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 3 MP3410 — 1.3A, 550kHz SYNCHRONOUS RECTIFIED STEP-UP CONVERTER TYPICAL PERFORMANCE CHARACTERISTICS Circuit on front page, VIN = 2.4V, VOUT = 3.3V, TA = +25°C, unless otherwise noted. MP3410 Rev. 1.12 6/30/2011 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 4 MP3410 — 1.3A, 550kHz SYNCHRONOUS RECTIFIED STEP-UP CONVERTER TYPICAL PERFORMANCE CHARACTERISTICS (continued) Circuit on front page, VIN = 2.4V, VOUT = 3.3V, TA = +25°C, unless otherwise noted. PIN FUNCTIONS Pin # Name Description 1 FB 2 3 GND OUT 4 SW 5 EN MP3410 Rev. 1.12 6/30/2011 Regulation Feedback Input. Connect to an external resistive voltage divider from the output to FB to set the output voltage. Ground. Supply Input for the MP3410. Connect to the output of the converter. Output Switching Node. SW is the drain of the internal low-side N-Channel MOSFET and high-side P-Channel MOSFET. Connect the inductor to SW to complete the step-up converter. Regulator On/Off Control Input. A logic high input turns on the regulator. A logic low input (VEN < 0.4V) puts the MP3410 into low current shutdown mode. EN Input High Voltage will shift upward for a higher VIN. For a given VIN, as long as the voltage applied at EN pin is equal to or higher than correspondent EN-High-min value specified in the EC table , the part can turn on normally. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 5 MP3410 — 1.3A, 550kHz SYNCHRONOUS RECTIFIED STEP-UP CONVERTER OPERATION UVLO REFERENCE VOLTAGE BIAS CURRENT THERMAL SHUTDOWN EN OUT OSC 500KHz CONTROL LOGIC SW RAMP + RS PWM COMPARATOR CURRENT SENSE AMPLIFIER GND FB ERROR AMPLIFIER 1.2V Figure 1—Functional Block Diagram The MP3410 uses a 550kHz fixed-frequency, current-mode regulation architecture to regulate the output voltage. The MP3410 measures the output voltage through an external resistive voltage divider and compares that to the internal 1.2V reference to generate the error voltage. The current-mode regulator compares the error voltage to the inductor current to regulate the output voltage. The use of current-mode regulation improves transient response and control loop stability. When the MP3410 is disabled (EN = Low), both power switches are off. The body of the P-Channel MOSFET connects to SW and there is no current path from SW to OUT. Therefore, the output voltage discharges to ground. When the MP3410 is enabled (EN = High), the body of the P-Channel MOSFET connects to OUT and forms a forward diode from SW to OUT. Thus the output voltage rises up toward the input voltage. When output voltage crosses 1.6V the MP3410 starts the controller and regulates the output voltage to the target value. MP3410 Rev. 1.12 6/30/2011 At the beginning of each cycle, the N-Channel MOSFET switch is turned on, forcing the inductor current to rise. The current at the source of the switch is internally measured and converted to a voltage by the current sense amplifier. That voltage is compared to the error voltage. When the inductor current rises sufficiently, the PWM comparator turns off the switch, forcing the inductor current to the output capacitor through the internal P-Channel MOSFET rectifier, which forces the inductor current to decrease. The peak inductor current is controlled by the error voltage, which in turn is controlled by the output voltage. Thus the output voltage controls the inductor current to satisfy the load. Soft-Start The MP3410 includes a soft-start timer that limits the voltage at the error amplifier output during startup to prevent excessive current at the input. This prevents premature termination of the source voltage at startup due to inrush current. This also limits the inductor current at startup, forcing the input current to rise slowly to the amount required to regulate the output voltage during soft-start. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 6 MP3410 — 1.3A, 550kHz SYNCHRONOUS RECTIFIED STEP-UP CONVERTER APPLICATION INFORMATION COMPONENT SELECTION Selecting the Inductor Setting the Output Voltage The inductor is required to force the output voltage higher while being driven by the lower input voltage. A good rule for determining the inductance is to allow the peak-to-peak ripple current to be approximately 30%-50% of the maximum input current. Make sure that the peak inductor current is below the minimum current limit at the duty cycle used (to prevent loss of regulation due to the current limit variations). Set the output voltage by selecting the resistive voltage divider ratio. The voltage divider drops the output voltage to the 1.19V feedback voltage. Use a 100kΩ resistor for R2 of the voltage divider. Determine the high-side resistor R1 by the equation: R1 = VOUT − VFB ⎛ VFB ⎞ ⎜⎜ ⎟⎟ ⎝ R2 ⎠ Where VOUT is the output voltage, VFB is the 1.19V feedback voltage and R2=100kΩ. 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. Multi-layer ceramic capacitors are the best choice as they have extremely low ESR and are available in small footprints. Use an input capacitor value of 4.7μF or greater. This capacitor must be placed physically close to the device. Selecting the Output Capacitor A single 4.7µF to 10µF ceramic capacitor usually provides sufficient output capacitance for most applications. Larger values up to 22µF may be used to obtain extremely low output voltage ripple and improve transient response. The impedance of the ceramic 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 VRIPPLE is calculated as: VRIPPLE = Calculate the required inductance value L using the equations: L= VIN × (VOUT - VIN ) VOUT × f SW × ΔI IIN(MAX ) = VOUT × ILOAD (MAX ) VIN × η ΔI = (30% − 50%)IIN(MAX) Where ILOAD(MAX) is the maximum load current, ΔI is the peak-to-peak inductor ripple current and η is efficiency. For the MP3410, typically, 4.7µH is recommended for most applications. Choose an inductor that does not saturate at the peak switch current as calculated above with additional margin to cover heavy load transients and extreme startup conditions. ILOAD (VO UT − VIN ) VO UT × C2 × f SW Where VIN is the input voltage, ILOAD is the load current, C2 is the capacitance of the output capacitor and fSW is the 550kHz switching frequency. MP3410 Rev. 1.12 6/30/2011 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 7 MP3410 — 1.3A, 550kHz SYNCHRONOUS RECTIFIED STEP-UP CONVERTER Selecting the Feed-Forward Capacitor LAYOUT CONSIDERATIONS A feed-forward capacitor C3 in parallel with the high-side resistor R1 can be added to improve the output ripple at discontinuous conduction mode and the load transient response (see Figure 2). Up to 220pF for this capacitor is recommended for 3.3V output applications. 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. All feedback components must be kept close to the FB pin to prevent noise injection on the FB pin trace. The ground return of C1 and C2 should be tied close to the GND pin. See the MP3410 demo board layout for reference. Selecting the Schottky Diode A Schottky diode D1 in parallel with the highside P-Channel MOSFET is necessary to clamp the SW node to a safe level for outputs of 4V or above. A 0.5A, 20V Schottky diode can be used for this purpose. See Figure 3. VIN 1.8V - 3.2V 4 SW OUT EN 5 3 C3 Up to 220pF OPTIONAL MP3410 EN FB GND VOUT 3.3V 400mA 1 2 Figure 2—3.3V Typical Application Circuit with Feed-Forward Capacitor 4 SW OUT 5 EN 3 MP3410 GND FB 1 2 Figure 3—5V Typical Application Circuit with External Schottky Diode and Output Disconnect Not Required MP3410 Rev. 1.12 6/30/2011 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 8 MP3410 — 1.3A, 550kHz SYNCHRONOUS RECTIFIED STEP-UP CONVERTER D1 VIN 2.5V - 4.2V P1 4 3 SW OUT 5 EN VOUT 5V 400mA MP3410 EN 1 FB GND 2 Figure 4—5V Typical Application Circuit with External Schottky Diode and Output Disconnect Required L1 C3 470pF VIN 2.5V-4.2V 4 SW 3 OUT EN 5 VOUT 5V 400mA MP3410 EN 1 FB GND 2 Figure 5—5V Typical Application Circuit L1 4.7 B130 Vin 3V 4 C1 10 SW OUT 3 MP3410 EN 5 EN FB GND 2 Vout 3.8V 750mA R1 220k 1 R2 100 k C2 10 Figure 6—3V-3.8V/750mA Application MP3410 Rev. 1.12 6/30/2011 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 9 MP3410 — 1.3A, 550kHz SYNCHRONOUS RECTIFIED STEP-UP CONVERTER PACKAGE INFORMATION TSOT23-5 0.95 BSC 0.60 TYP 2.80 3.00 5 4 1.20 TYP 1.50 1.70 1 2.60 TYP 2.60 3.00 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 A 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. MP3410 Rev. 1.12 www.MonolithicPower.com 6/30/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 10