MPM3606AGQV-Z

MPM3606A 21V/0.6A DC/DC Module Synchronous Step-Down Converter with Integrated Inductor DESCRIPTION FEATURES The MPM3606A is a synchronous rectified, step-down module converter with built-in power MOSFETs, inductor, and two capacitors. It offers a compact solution that requires only 5 external components to achieve a 0.6A continuous output current with excellent load and line regulation over a wide input-supply range. Also, it provides fast load transient response. • • • Full protection features include over-current protection (OCP) and thermal shutdown (TSD). MPM3606A eliminates design and manufacturing risks while dramatically improving time-to-market. The MPM3606A is available in a space-saving QFN20 (3mmx5mmx1.6mm) package. 4.5V-to-21V Operating Input Range 0.6A Continuous Load Current 100mΩ/50mΩ Low RDS(ON) Internal Power MOSFETs Integrated Inductor Integrated VCC and Bootstrap Capacitors Power-Save Mode at Light Load Power Good Indicator Over-Current Protection and Hiccup Thermal Shutdown Output Adjustable from 0.8V Available in QFN20 (3x5x1.6mm) Package Total solution size 6.7mm x7.3mm • • • • • • • • • APPLICATIONS • • • • • Industrial Controls Medical and Imaging Equipment Telecom and Networking Applications LDO Replacement Space and Resource-limited Applications All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Products, Quality Assurance page. “MPS” and “The Future of Analog IC Technology” are registered trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION BST SW VIN 12V IN C1 10µF R3 100k MPM3606A C2 22µF EN EN R1 75k FB VCC PG 3.3V/0.6A VOUT OUT NC PG PGND R2 24k AGND MPM3606A Rev. 1.0 www.MonolithicPower.com 1/5/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 1 MPM3606A – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR ORDERING INFORMATION Part Number* MPM3606AGQV Package QFN-20 (3mmx5mmx1.6mm) Top Marking See Below * For Tape & Reel, add suffix –Z (e.g. MPM3606AGQV–Z); TOP MARKING MP: MPS prefix: Y: year code; W: week code: 3606A: first five digits of the part number; LLL: lot number; M: module; MPM3606A Rev. 1.0 www.MonolithicPower.com 1/5/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 2 MPM3606A – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR PACKAGE REFERENCE TOP VIEW PG EN IN NC PGND PGND 18 17 16 15 14 13 FB 1 12 PGND VCC 2 11 BST 10 NC 19 20 AGND 3 SW 4 9 OUT SW 5 8 OUT SW 6 7 OUT NC NC All “NC” pins must be left floating ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance VIN ................................................ -0.3V to 28V VSW .................................................................... -0.3V (-5V for 1V, when VFB is above 90% of VREF, PG is pulled high (after a 35µs delay time). During normal operation, PG is pulled low when the VFB drops below 83% of VREF (after a 80µs delay). When UVLO or OTP occurs, PG is pulled low immediately; when OC (over-current) occurs, PG is pulled low when VFB drops below 83% of VREF (after a 80µs delay). Since MPM3606A doesn’t implement dedicated output over-voltage protection, the PG won’t response to an output over-voltage condition. Over-Current-Protection and Hiccup The MPM3606A has a cycle-by-cycle overcurrent limiting control. When the inductor current-peak value exceeds internal peak current-limit threshold, the HS-FET turns off and the LS-FET turns on, remaining on until the inductor current falls below the internal valley current-limit threshold. The valley current-limit circuit is employed to decrease the MPM3606A Rev. 1.0 www.MonolithicPower.com 1/5/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 14 MPM3606A – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR operation frequency (after the peak current-limit threshold is triggered). Meanwhile, the output voltage drops until VFB is below the undervoltage (UV) threshold (50% below the reference, typically). Once UV is triggered, the MPM3606A enters hiccup mode to re-start the part periodically. This protection mode is useful when the output is dead-shorted to ground and greatly reduces the average short-circuit current to alleviate thermal issues and protect the converter. The MPM3606A exits hiccup mode once the over-current condition is removed. COMP voltage and the internal supply rail are then pulled down. The floating driver is not subject to this shutdown command. Thermal Shutdown (TSD) To prevent thermal damage, MPM3606A stops switching when the die temperature exceeds 150°C. As soon as the temperature drops below its lower threshold (130°C, typically), the power supply resumes operation. Where fS is the switching frequency, Cs is the snubber capacitor, and VIN is the input voltage. Floating Driver and Bootstrap Charging An internal bootstrap capacitor powers the floating power MOSFET driver. This floating driver has its own UVLO protection. This UVLO’s rising threshold is 2.2V with a hysteresis of 150mV. The bootstrap capacitor voltage is regulated internally by VIN through D1, M1, C4, L1 and C2 (see Figure 5). If (VBSTVSW) exceeds 5V, U1 regulates M1 to maintain a 5V voltage across C4. Additional RC Snubber Circuit An additional RC snubber circuit can be chosen to clamp the voltage spike and damp the ringing voltage for better EMI performance. The power dissipation of the RC snubber circuit is estimated by the formula below: PLoss =fS × CS × VIN2 For improved efficiency, the value of CS should not be set too high. Generally, a 5.6Ω RS and a 330pF CS are recommended to generate the RC snubber circuit (see Figure 6). RS 5.6 SW CS 330pF Figure 6. Additional RC Snubber Circuit Figure 5. Internal Bootstrap Charging Circuit Start-Up and Shutdown If both VIN and VEN exceed their respective thresholds, the chip starts up. The reference block starts first, generating stable reference voltage, and then the internal regulator is enabled. The regulator provides a stable supply for the remaining circuitries. Three events shut down the chip: VIN low, VEN low and thermal shutdown. During the shutdown procedure, the signaling path is blocked first to avoid any fault triggering. The MPM3606A Rev. 1.0 www.MonolithicPower.com 1/5/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 15 MPM3606A – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR APPLICATION INFORMATION Setting the Output Voltage The external resistor divider sets the output voltage (see Typical Application on page 1). Choose R1 (see Table 1); R2 is then given by: R1 R2 = VOUT −1 0.798V Figure 7. Feedback Network See Table 1 and Figure 7 for the feedback network and a list of recommended feedback network parameters for common output voltages. Table 1. Recommended Parameters for Common Output Voltages Small Solution Size(CIN=10µF/0805/25V, COUT=22µF/0805/16V) VIN (V) 21 19 16 14 VOUT VOUT Ripple R1 (kΩ) R2 (kΩ) Cf (pF) (9) (mV) (V) R1 (kΩ) R2 (kΩ) Cf (pF) VOUT Ripple (9) (mV) 5 115 22 NS 17.6 40.2 7.68 NS 9.4 3.3 102 32.4 NS 12.4 62 19.6 NS 7 2.5 102 47.5 5.6 10 62 29.4 5.6 5.2 5 115 22 NS 16.4 40.2 7.68 NS 8.8 3.3 102 32.4 NS 11.4 62 19.6 NS 6.6 2.5 102 47.5 5.6 9.8 62 29.4 5.6 5 5 115 22 NS 15.6 40.2 7.68 NS 7.8 3.3 102 32.4 NS 10.6 62 19.6 NS 6 2.5 102 47.5 5.6 9.6 62 29.4 5.6 4.8 1.8 102 82 5.6 8.6 62 49.9 5.6 4 5 115 22 NS 14.8 40.2 7.68 NS 7.4 3.3 102 32.4 NS 10.2 40.2 12.7 NS 5.6 2.5 75 34.8 5.6 9.4 40.2 18.7 5.6 4.6 1.8 102 82 5.6 8.4 62 49.9 5.6 4.2 1.5 158 180 5.6 7.2 62 69.8 5.6 3.6 5 100 19.1 NS 13.8 34 6.49 NS 6.4 3.3 75 24 NS 9.4 40.2 12.7 NS 5.2 2.5 75 34.8 5.6 9 40.2 18.7 5.6 4.4 1.8 (10) 12 Low VOUT Ripple(CIN=10µF/0805/25V, COUT=2X22µF/0805/16V) 102 82 5.6 7.8 47 37.4 5.6 4 (10) 158 180 5.6 6.6 47 53.6 5.6 3.4 (10) 158 316 5.6 6.2 75 147 5.6 3 1.5 1.2 MPM3606A Rev. 1.0 www.MonolithicPower.com 1/5/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 16 MPM3606A – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR Table 1: Recommended Parameters For Common Output Voltages (continued) Small Solution Size(CIN=10µF/0805/25V, COUT=22µF/0805/16V) VIN (V) 10 VOUT (V) R1 (kΩ) 5 100 19.1 NS 13.2 34 6.49 NS 6.2 3.3 75 24 NS 8.4 40.2 12.7 NS 4.8 2.5 75 34.8 5.6 8.2 40.2 18.7 5.6 4 1.8 75 59 5.6 7.2 47 37.4 5.6 3.6 1.5 102 115 5.6 6 47 53.6 5.6 3.2 (10) 1.2 VOUT Ripple (9) (mV) 102 205 5.6 5.4 62 124 5.6 2.8 102 402 5.6 4.8 82 324 5.6 2.6 5 100 19.1 NS 9.2 34 6.49 NS 5 3.3 75 24 NS 7.6 40.2 12.7 NS 3.8 2.5 75 34.8 5.6 7 40.2 18.7 5.6 3.4 1.8 75 59 5.6 6.4 47 37.4 5.6 3 1.5 75 84.5 5.6 5.4 47 53.6 5.6 2.8 (10) 1.2 5 R1 (kΩ) R2 (kΩ) Cf (pF) (10) 1 8 R2 (kΩ) Cf (pF) VOUT Ripple (9) (mV) Low VOUT Ripple(CIN=10µF/0805/25V, COUT=2X22µF/0805/16V) 75 147 5.6 5 47 93.1 5.6 2.6 (10) 1 75 294 5.6 4.6 56 221 5.6 2.2 3.3 75 24 NS 6 40.2 12.7 NS 3.4 2.5 75 34.8 5.6 5.8 40.2 18.7 5.6 3.2 1.8 75 59 5.6 5.2 47 37.4 5.6 2.8 1.5 62 69.8 5.6 5 47 53.6 5.6 2.4 62 124 5.6 4.6 47 93.1 5.6 2.2 62 243 5.6 4.4 47 187 5.6 2 (10) 1.2 (10) 1 Notes: 9) The output voltage ripple is tested at 0.6A output current. 10) In these specs, BST operation current will charge the output voltage higher than the setting value when completely no load due to large divider resistor value. 10µA load current is able to pull the output voltage to normal regulation level. Normally, it is recommended to set output voltage from 0.8V to 5.5V. However, it can be set higher than 5.5V. In this case, the outputvoltage ripple is larger due to a larger inductor ripple current. An additional output capacitor is needed to reduce the output-ripple voltage. If output voltage is high, heat dissipation becomes more important. Refer to PC board layout guidelines on page 18 to achieve better thermal performance. Selecting the Input Capacitor The input current to the step-down converter is discontinuous, and therefore requires a capacitor to supply the AC current while maintaining the DC input voltage. Use low ESR capacitors for improved performance. Use ceramic capacitors with X5R or X7R dielectrics for optimum results because of their low ESR and small temperature coefficients. For most applications, use a 10µF capacitor. . MPM3606A Rev. 1.0 www.MonolithicPower.com 1/5/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 17 MPM3606A – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR Since C1 absorbs the input-switching current, it requires an adequate ripple-current rating. The RMS current in the input capacitor is estimated by: IC1 = ILOAD × VOUT  VOUT  × 1− VIN  VIN  The worst case condition occurs at VIN = 2VOUT, where: IC1 = ILOAD 2 For simplification, choose an input capacitor with an RMS current rating greater than half of the maximum load current. The input capacitor can be electrolytic, tantalum or ceramic. When using electrolytic or tantalum capacitors, add a small, high-quality ceramic capacitor (e.g. 0.1μF) placed as close to the IC as possible. When using ceramic capacitors, make sure they have enough capacitance to provide sufficient charge to prevent excessive voltage ripple at input. The input-voltage ripple caused by capacitance can be estimated as: ∆V = IN ΔVOUT = VOUT  VOUT × 1− fS × L1  VIN    1   ×  RESR + 8 × f × C2   S  VOUT  V ×  1 − OUT fS × L1  VIN   × RESR  The characteristics of the output capacitor affect the stability of the regulation system. The MPM3606A internal compensation is optimized for a wide range of capacitance and ESR values. PC Board Layout (11) Efficient PCB layout is critical to achieve stable operation, particularly for input capacitor placement. For best results, refer to figure 8, and follow the guidelines below: 1. Use large ground plane to connect directly to PGND. Add vias near the PGND if the bottom layer is ground plane. 2. The high-current paths (PGND, IN and OUT) should have short, direct and wide traces. Place the ceramic input capacitor close to IN and PGND. Keep the input capacitor and IN connection as short and wide as possible. 3. Place the external feedback resistors next to FB. 4. Keep the feedback network away from the switching node.   ILOAD V V × OUT ×  1 − OUT  fS × C1 VIN  VIN  Selecting the Output Capacitor The output capacitor (C2) maintains the DC output voltage. Use ceramic, tantalum, or low ESR electrolytic capacitors. For best results, use low ESR capacitors to keep the outputvoltage ripple low. The output-voltage ripple is estimated as: ∆VOUT = For tantalum or electrolytic capacitors, the ESR dominates the impedance at the switching frequency. For simplification, the output ripple is approximated as: Notes: 11) The recommended layout is based on Typical Application Circuits section on page 20. Where L1 is the inductor value, RESR is the equivalent series resistance (ESR) value of the output capacitor, and L1=1μH. For ceramic capacitors, the capacitance dominates the impedance at the switching frequency; the capacitance causes the majority of the output-voltage ripple. For simplification, the output-voltage ripple is estimated as: = ΔVOUT  V  VOUT ×  1 − OUT  VIN  8 × fS × L1 × C2  2 MPM3606A Rev. 1.0 www.MonolithicPower.com 1/5/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 18 MPM3606A – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR VIN GND VOUT Design Example Table 2 shows a design example following the application guidelines for the specifications: Table 2. Design Example PGND PGND IN NC R3 EN PG R1 NC BST NC VCC AGND C2 NC OUT SW 12V 3.3V 0.6A The detailed application schematic is shown in Figure 10. The typical performance and circuit waveforms are shown in the Typical Characteristics section (For additional device applications, please refer to the related evaluation board datasheets). PGND NC FB R2 C3 6.7mm VIN VOUT IOUT C1 6.3mm 7.3mm Top Layer GND VOUT Bottom Layer Figure 8. Recommended PC Board Layout MPM3606A Rev. 1.0 www.MonolithicPower.com 1/5/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 19 MPM3606A – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR TYPICAL APPLICATION CIRCUITS(12)(13) BST 11 SW 4, 5, 6 12V 16 C1 10µF IN R3 100k 17 EN EN 2 R4 100k 18 5V/0.6A VOUT 7, 8, 9 OUT C2 22µF R1 100k FB 1 VCC R2 19.1k PG PGND AGND 12, 13, 14 PG MPM3606A NC 10, 15, 19, 20 3 VIN Figure 9. Vo=5V, Io=0.6A BST 11 SW 4, 5, 6 16 C1 10µF IN R3 100k 17 EN EN 2 R4 100k 18 OUT 3.3V/0.6A VOUT 7, 8, 9 C2 22µF R1 75k FB 1 VCC R2 24k PG PGND AGND 12, 13, 14 PG MPM3606A NC 10, 15, 19, 20 3 VIN 12V Figure 10. Vo=3.3V, Io=0.6A BST 11 SW 4, 5, 6 16 C1 10µF IN R3 100k 17 EN EN 2 18 OUT 2.5V/0.6A VOUT 7, 8, 9 C2 22µF R1 75k C3 5.6pF FB 1 VCC R2 34.8k PG PGND AGND 12, 13, 14 R4 100k MPM3606A NC 10, 15, 19, 20 3 VIN 12V Figure 11. Vo=2.5V, Io=0.6A MPM3606A Rev. 1.0 www.MonolithicPower.com 1/5/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 20 MPM3606A – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR TYPICAL APPLICATION CIRCUITS(continued) BST 11 SW 4, 5, 6 16 C1 10µF IN R3 100k 17 EN EN 2 18 OUT 1.8V/0.6A VOUT 7, 8, 9 C2 22µF R1 102k C3 5.6pF FB 1 VCC R2 82k PG PGND AGND 12, 13, 14 R4 100k MPM3606A NC 10, 15, 19, 20 3 VIN 12V Figure 12. Vo=1.8V, Io=0.6A BST 11 SW 4, 5, 6 16 C1 10µF IN R3 100k 17 EN EN 2 18 OUT 1.5V/0.6A VOUT 7, 8, 9 C2 22µF R1 158k C3 5.6pF FB 1 VCC R2 180k PG PGND AGND 12, 13, 14 R4 100k MPM3606A NC 10, 15, 19, 20 3 VIN 12V Figure 13. Vo=1.5V, Io=0.6A BST 11 SW 4, 5, 6 16 C1 10µF IN R3 100k 17 EN EN 2 18 OUT 1.2V/0.6A VOUT 7, 8, 9 C2 22µF R1 158k C3 5.6pF FB 1 VCC R2 316k PG PGND AGND 12, 13, 14 R4 100k MPM3606A NC 10, 15, 19, 20 3 VIN 12V Figure 14. Vo=1.2V, Io=0.6A MPM3606A Rev. 1.0 www.MonolithicPower.com 1/5/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 21 MPM3606A – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR TYPICAL APPLICATION CIRCUITS (continued) BST 11 SW 4, 5, 6 16 C1 10µF IN R3 100k 17 EN EN 2 18 OUT 1V/0.6A VOUT 7, 8, 9 C2 22µF R1 158k C3 5.6pF FB 1 VCC R2 634k PG PGND AGND 12, 13, 14 R4 100k MPM3606A NC 10, 15, 19, 20 3 VIN 12V Figure 15: Vo=1V, Io=0.6A Notes: 12) In 12VIN to 1VOUT application condition, the HS-FET’s on time is close to minimum on time, the SW may have a little jitter, even so the output voltage ripple is smaller than 15mV in PWM mode. 13) In 12VIN to 1.5/1.2/1 VOUT application condition, BST operation current will charge the output voltage higher than the setting value when completely no load due to large divider resistor value. 10µA load current is able to pull the output voltage to normal regulation level. MPM3606A Rev. 1.0 www.MonolithicPower.com 1/5/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 22 MPM3606A – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR C G OU G O 0 C Q O 0 5 e so 60 QFN-20 (3mmx5mmx1.6mm) PACKAGE INFORMATION (3 5 ) PIN 1 ID 0.125X45º TYP PIN 1 ID MARKING NOTE 2 PIN 1 ID INDEX AREA BOTTOM VIEW TOP VIEW SIDE VIEW NOTE: 0.125X45º NOTE 2 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) SHADED AREA IS THE KEEP-OUT ZONE. ANY PCB METAL TRACE AND VIA ARE NOT ALLOWED TO CONNECT TO THIS AREA ELECTRICALLY OR MECHANICALLY. 3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETERS MAX. 4) JEDEC REFERENCE IS MO-220. 5) DRAWING IS NOT TO SCALE. 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. MPM3606A Rev. 1.0 www.MonolithicPower.com 1/5/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 23