MP8619EQJ-LF-Z

MP8619 8A, 25V, 600kHz Synchronous Step-down Converter The Future of Analog IC Technology DESCRIPTION FEATURES The MP8619 is a high frequency synchronous rectified step-down switch mode converter with built in internal power MOSFETs. It offers a very compact solution to achieve 8A continuous output current over a wide input supply range with excellent load and line regulation. • • • • • • • • • Current mode operation provides fast transient response and eases loop stabilization. Full protection features include OCP and thermal shut down. Wide 4.5V to 25V Operating Input Range 8A Output Current Proprietary Switching Loss Reduction Technique Fixed 600kHz Switching Frequency Sync from 300kHz to 2MHz External Clock Internal Compensation OCP Protection and Thermal Shutdown Output Adjustable from 0.8V to 15V Available in 30-pin 5x6mm QFN30 Package APPLICATIONS The MP8619 requires a minimum number of readily available standard external components and is available in a space saving 5mm x 6mm 30-pin QFN package. • • • Networking Systems Digital Set Top Boxes Distributed Power Systems “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION Efficiency VIN =12.6V, VOUT =3.3V VIN 27-29 23 IN C3 1uF 22 VCC BST 16-19 SW R3 100k 100 L1 1.5uH 95 VOUT R1 31.6k MP8619 FB 24 BG 25 C4 1uF EN/SYNC PG GND 9-15,20,21,30 R2 10k 5-8 26 ON OFF C2 100uF 90 EFFICIENCY(%) C1 22uF 85 80 75 70 65 60 55 50 MP8619 Rev. 0.9 12/10/2013 0 1 2 3 4 5 6 7 8 OUTPUT CURRENT(A) www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 9 1 MP8619 – 8A, 25V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS ORDERING INFORMATION Part Number* Package Top Marking Free Air Temperature (TA) MP8619EQJ 5x6 QFN30 8619EQJ –20°C to +85°C * For Tape & Reel, add suffix –Z (eg. MP8619EQJ–Z); For RoHS compliant packaging, add suffix –LF (eg. MP8619EQJ–LF–Z) NC GND IN IN IN EN/SYNC PG FB PACKAGE REFERENCE 30 29 28 27 26 25 24 1 23 BST NC 2 22 Vcc NC 3 21 GND NC 4 20 GND BG 5 19 SW BG 6 18 SW BG 7 17 SW BG 8 16 SW 11 12 13 GND GND GND GND ABSOLUTE MAXIMUM RATINGS (1) Supply Voltage VIN .......................................28V VSW ......................................–0.3V to VIN + 0.3V VBS ..................................................... VSW + 6V All Other Pins................................ –0.3V to +6V (2) Continuous Power Dissipation (TA = +25°C) ………………………………..……………..3.79W Junction Temperature.............................. 150°C Lead Temperature ................................... 260°C Storage Temperature.............. –65°C to +150°C Recommended Operating Conditions (3) Supply Voltage VIN .......................... 4.5V to 25V Output Voltage VOUT........................ 0.8V to 15V Operating Junct. Temp (TJ)..... –20°C to +125°C MP8619 Rev. 0.9 12/10/2013 14 15 GND 10 GND 9 GND SW Thermal Resistance (4) θJA θJC 5x6 QFN30............................. 33 ....... 7.... °C/W 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. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 2 MP8619 – 8A, 25V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS ELECTRICAL CHARACTERISTICS VIN = 12V, TA = +25°C, unless otherwise noted. Parameters Symbol Supply Current (Shutdown) IIN Supply Current (Quiescent) (5) HS Switch On Resistance (5) LS Switch On Resistance IIN HSRDS-ON LSRDS-ON Switch Leakage SW LKG (5) Current Limit Oscillator Frequency Maximum Duty Cycle ILIMIT FSW DMAX Sync Frequency Range Feedback Voltage Feedback Current EN/SYNC Input Low Voltage EN/SYNC Input High Voltage FSYNC VFB IFB VILEN VIHEN EN Input Current IEN EN Turn Off Delay Power Good Rising Threshold Power Good Falling Threshold Power Good Delay Power Good Sink Current Capability Power Good Leakage Current VIN Under Voltage Lockout Threshold Rising VIN Under Voltage Lockout Threshold Hysteresis VCC Regulator VCC Load Regulation Thermal Shutdown Condition Min VEN = 0V VEN = 2V, VFB = 1V VEN = 0V, VSW = 0V or 12V VFB = 0.75V VFB = 700mV 9.5 450 85 0.3 788 VFB = 800mV Max Units 0 1 μA 0.7 50 8 1 mA mΩ mΩ 10 200 nA 730 A kHz % 600 90 808 10 2 828 100 0.4 2 VEN = 2V VEN = 0V ENTd-Off PGVth-Hi PGVth-Lo PGTd VPG Sink 4mA IPG_LEAK VPG = 3.3V INUVVth 3.8 INUVHYS 4.5 Icc=5mA MHz mV nA V V 2 0.1 μA 15 0.71 0.53 25 μsec V V μs 0.4 V 1 100 nA 4.0 4.2 V 880 VCC TSD Typ mV 5.5 5 150 % °C Note: 5) Guaranteed by design. MP8619 Rev. 0.9 12/10/2013 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 3 MP8619 – 8A, 25V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS PIN FUNCTIONS Pin # Name 1—4 5—8 NC BG 9—15, 20,21, 30 GND 16—19 Exposed Pad SW 22 VCC 23 24 25 26 27—29 MP8619 Rev. 0.9 12/10/2013 Description No Connect. Low Side Gate Drive System Ground. This pin is the reference ground of the regulated output voltage. For this reason care must be taken in PCB layout. Connect exposed pad to GND plane for optimal thermal performance. Switch Output. Use wide PCB traces and multiple vias to make the connection. Bias Supply. Decouple with 1µF capacitor. Bootstrap. A capacitor connected between SW and BS pins is required to form a BST floating supply across the high-side switch driver. Feedback. An external resistor divider from the output to GND, tapped to the FB FB pin, sets the output voltage. Power Good Output, the output of this pin is open drain. Power good threshold is PG 90% low to high and 70% high to low of regulation value. There is a 20μs delay to pull PG if the output voltage is lower than 10% of regulation value. EN=1 to enable the MP8619. External clock can be applied to EN pin for changing EN/SYNC switching frequency. For automatic start-up, connect EN pin to VIN with 100KΩ resistor. Supply Voltage. The MP8619 operates from a +4.5V to +25V input rail. C1 is IN needed to decouple the input rail. Use wide PCB traces and multiple vias to make the connection. www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 4 MP8619 – 8A, 25V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS TYPICAL PERFORMANCE CHARACTERISTICS VIN = 12.6V, VOUT = 3.3V, L = 1.5µH, TA = +25ºC, unless otherwise noted. Peak Current vs. Duty Cycle 5.6 16 PEAK CURRENT (A) 5.2 VCC (V) 4.8 4.4 4 3.6 3.2 14 12 10 8 2.8 0 5 10 15 20 25 INPUT VOLTAGE (V) 6 30 0.2 0.4 0.6 0.8 1 95 35 90 EFFICIENCY(%) 40 30 25 20 15 10 0 VIN =12.6V -0.1 -0.2 -0.3 0 6 8 10 Thermal Derating 12 85 80 75 70 65 50 10 4 IC TEMP. Rise 65% VIN In these cases, an external BST diode is recommended from the output of the voltage regulator to BST pin, as shown in Fig.3 External BST Diode IN4148 BST MP8619 SW CBST L + COUT 5V or 3.3V Figure 3—Add Optional External Bootstrap Diode to Enhance Efficiency The recommended external BST diode is IN4148, and the BST cap is 0.1~1µF. ⎞ ⎞ ⎛ 1 ⎟ ⎟⎟ × ⎜ R ESR + ⎜ 8 × f S × C2 ⎟⎠ ⎠ ⎝ Where L is the inductor value and RESR is the equivalent series resistance (ESR) value of the output capacitor. In the case of ceramic capacitors, the impedance at the switching frequency is dominated by the capacitance. The output voltage ripple is mainly caused by the capacitance. For simplification, the output voltage ripple can be estimated by: ΔVOUT = ⎞ ⎛ V × ⎜⎜1 − OUT ⎟⎟ VIN ⎠ × L × C2 ⎝ VOUT 8 × fS 2 In the case of tantalum or electrolytic capacitors, the ESR dominates the impedance at the switching frequency. For simplification, the output ripple can be approximated to: ΔVOUT = MP8619 Rev. 0.9 12/10/2013 VOUT ⎛ V × ⎜⎜ 1 − OUT fS × L ⎝ VIN ⎞ ⎟⎟ × R ESR ⎠ www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 10 MP8619 – 8A, 25V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS PCB Layout PCB layout is very important to achieve stable operation. Please follow these guidelines and take Figure 4 for references. The high current paths (GND, IN and SW) should be placed very close to the device with short, direct and wide traces. The input capacitor needs to be as close as possible to the IN and GND pins. The external feedback resistors should be placed next to the FB pin. Keep the switching node SW short and away from the feedback network. Inner 1 Top Layer Inner 2 Bottom Layer Figure –4 PCB Layout MP8619 Rev. 0.9 12/10/2013 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 11 MP8619 – 8A, 25V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS PACKAGE INFORMATION 5mm x 6mm QFN30 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. MP8619 Rev. 0.9 12/10/2013 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 12