MP3414A 3A, 1MHz, 22μA Iq, 5.5V Synchronous Step-Up Converter with Output Disconnect DESCRIPTION FEATURES The MP3414A is a high-efficiency, synchronous current mode, step-up converter with output disconnect. The MP3414A can start up from an input voltage as low as 1.8V while providing inrush current limiting and output short-circuit protection (SCP). The integrated P-channel synchronous rectifier improves efficiency and eliminates the need for an external Schottky diode. The PMOS disconnects the output from the input when the MP3414A shuts down. The output disconnect feature allows the output to be discharged completely, allowing the MP3414A to draw a supply current of under 1μA in shutdown mode. Supports 5V/1A Output at 2.8V Input 1.8V to 5.5V Input Voltage Range Up to 5.5V Output Voltage Internal Synchronous Rectifier 1MHz Fixed Switching Frequency 22μA Quiescent Current <1μA Shutdown Current True Output Disconnect from Input Up to 97% Efficiency Internal Compensation, Inrush Current Limiting, and Internal Soft Start Tiny External Components OVP, SCP, and OTP TSOT23-8 Package APPLICATIONS The 1MHz switching frequency allows small external components while the internal compensation and soft start minimize the external component count. These features produce a compact solution for a wide current load range. The MP3414A features an integrated power MOSFET that supports an output of up to 5.5V and a peak switching current above 3A. Two-Cell and Three-Cell Alkaline, NiCd or NiMH, or Single-Cell Li Battery-Power Products Personal Medical Devices Portable Media Players Wireless Peripherals Gaming Accessories All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For MPS green status, please visit the MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are registered trademarks of Monolithic Power Systems, Inc. The MP3414A is available in a small 8-pin TSOT23 package. TYPICAL APPLICATION L1 1.5uH SW VIN IN C1 10μF MP3414A OFF ON EN PGND VOUT OUT R1 1MΩ C2 22μF FB AGND R2 137kΩ MP3414A Rev. 1.1 www.MonolithicPower.com 6/26/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 1 MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT ORDERING INFORMATION Part Number* MP3414AGJ Package TSOT23-8 Top Marking See Below * For Tape & Reel, add suffix –Z (e.g. MP3414AGJ–Z) TOP MARKING AKT: Product code of MP3414AGJ Y: Year code PACKAGE REFERENCE TOP VIEW IN 1 8 EN OUT 2 7 FB SW 3 6 AGND PGND 4 5 FTY MP3414A Rev. 1.1 www.MonolithicPower.com 6/26/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 2 MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance SW, OUT ................................... -0.3V to +6.5V SW (<5ns) .................................... -0.3V to +9V All other pins ............................... -0.3V to +6.5V Continuous power dissipation (TA = +25°C) (2) ................................................................ 1.25W Junction temperature ............................... 150C Lead temperature .................................... 260C Storage temperature ................ -65C to +150C TSOT23-8 .............................. 100 .... 55 ... °C/W Recommended Operating Conditions (3) Supply voltage (VIN) ....................... 1.8V to 5.5V VOUT ............................. VIN-MAX x 106% to 5.5V(4) Operating junction temp. (TJ). .. -40°C to +125°C (5) 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 produce an excessive die temperature, causing the regulator to 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) If VIN is close to VOUT, the boost converter may trigger minimum on-time. When VIN is higher than VOUT, the boost converter will switch between boost mode and linear charge mode. Both conditions will result in a VOUT-RIPPLE that is too high. Therefore, this is not suggested. 5) Measured on JESD51-7, 4-layer PCB. MP3414A Rev. 1.1 www.MonolithicPower.com 6/26/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 3 MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT ELECTRICAL CHARACTERISTICS VIN = VEN = 3.3V, VOUT = 5V, TJ = -40°C to 125°C, typical value is tested at TJ = 25°C, unless otherwise noted. Parameters Symbol Condition Min Typ Max Units VEN = VIN = 3.3V, VOUT = 5V, no load, VFB = 0.65V, measured on OUT, TJ = 25°C 22 30 µA VEN = VIN = 3.3V, VOUT = 5V, no load, VFB = 0.65V, measured on IN, TJ=25°C 8 12 µA VEN = VOUT = 0V, o measured on IN TJ = 25 C 0.1 1 µA VIN rising, TJ = 25°C. 1.65 1.7 V Voltage Range Quiescent current IQ Shutdown current ISD IN under-voltage lockout VIN_UVLO IN under-voltage lockout hysteresis Step-Up Converter 100 Operation frequency FSW Feedback voltage reference VFB Feedback input current NMOS on resistance IFB RNDS_ON NMOS leakage current PMOS on resistance PMOS leakage current Maximum duty cycle IN_LK RPDS_ON IP_LK DMAX Start-up current limit IST_LIMIT NMOS current limit Logic Interface ISW_LIMIT EN input high-level voltage EN input low-level voltage EN input current Protection Thermal shutdown VEN_H VEN_L IEN (6) Over-temperature hysteresis (6) TJ = 25°C TJ = -40°C to 125°C VFB = 0.63V 0.8 594 591 VSW = 6.5V, TJ = 25°C. VSW = 6.5V, VOUT = 0V, TJ = 25°C. 85 VIN = 4V, Vo = 0V VIN = 4V, Vo setting = 3.6V, pull Vo to 3.3V Duty = 40% 3 mV 1.0 600 600 1 70 1.2 606 609 50 MHz mV mV nA mΩ 0.1 80 0.1 95 0.3 1 µA mΩ µA % A 1 0.8 A 3.6 A 10 V V nA 155 °C 25 °C 1.2 0.4 Connect to VIN NOTE: 6) Guaranteed by characterization, not production tested. MP3414A Rev. 1.1 www.MonolithicPower.com 6/26/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 4 MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT TYPICAL PERFORMANCE CHARACTERISTICS VIN = 3.3V, VOUT = 5V, L = 1.5µH, TA = 25°C, unless otherwise noted. MP3414A Rev. 1.1 www.MonolithicPower.com 6/26/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 5 MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.3V, VOUT = 5V, L = 1.5µH, TA = 25°C, unless otherwise noted. MP3414A Rev. 1.1 www.MonolithicPower.com 6/26/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 6 MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.3V, VOUT = 5V, L = 1.5µH, TA = 25°C, unless otherwise noted. NOTE: 7) Tested with a 3A inductor peak current with the schematic in Figure 3. The maximum load current may decrease if the temperature rising is limited on the real application board. MP3414A Rev. 1.1 www.MonolithicPower.com 6/26/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 7 MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.3V, VOUT = 5V, L = 1.5µH, TA = 25°C, unless otherwise noted. MP3414A Rev. 1.1 www.MonolithicPower.com 6/26/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 8 MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.3V, VOUT = 5V, L = 1.5µH, TA = 25°C, unless otherwise noted. MP3414A Rev. 1.1 www.MonolithicPower.com 6/26/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 9 MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT PIN FUNCTIONS Pin # Name 1 IN 2 OUT 3 SW 4 PGND 5 FTY 6 AGND 7 FB 8 EN Pin Function Power supply input. The start-up bias is derived from IN and must be bypassed locally. Once the OUT voltage exceeds the IN voltage, the bias power comes from OUT. Output. OUT is the drain of the internal synchronous rectifier MOSFET. Bias power is derived from OUT when VOUT is higher than VIN. The PCB trace length from OUT to the output filter capacitor(s) should be as short and wide as possible. The output disconnect feature allows OUT to be disconnected completely from IN when EN is low. Power switch output. SW is the connection node of the internal low-side MOSFET and synchronous MOSFET. Connect the power inductor between SW and the input power. Keep the PCB trace length as short and wide as possible to reduce EMI and voltage spikes. Power ground. Factory use only. Leave FTY floating or connect it to ground in application. Analog ground. Feedback. Connect to the tap of an external resistive voltage divider from the output to FB to set the output voltage. Chip enable control input. Set EN higher than 1.2V to turn on the regulator. Set EN lower than 0.4V to turn off the regulator. MP3414A Rev. 1.1 www.MonolithicPower.com 6/26/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 10 MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT FUNCTION DIAGRAM VIN CIN L PGND SW IN OFF ON EN Bias and Voltage Ref Enable VIN Body Control OVP V BETTER VOUT OUT VDD HS + - Thermal Control OUT Start-Up Mode Control COUT Current Sense Driver and Control logic R1 PGND LS PGND Oscillator Slope COMP Current Limit Current Sense Amplifier + - S PGND FB + - EA A GND Clamp + + - PWM C OMP Soft Start R2 0.6V PGND Figure 1: Functional Block Diagram MP3414A Rev. 1.1 www.MonolithicPower.com 6/26/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 11 MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT OPERATION The MP3414A is a 1MHz synchronous step-up converter in a compact TSOT23 package with true output disconnect. The device features a fixed-frequency, current-mode PWM control for good line and load regulation. Internal soft start and loop compensation simplify the design process and minimize external components. The combined internal low RDS (ON) MOSFETs and frequency stretching allow the MP3414A to maintain high efficiency over a wide current load range. Start-Up When enabled, the MP3414A starts up in linear charge mode. During the linear charge, the rectified PMOS turns on until the output voltage is charged close to VIN. To avoid inrush current, the PMOS current is limited to about 0.3A (when VOUT is 0V). The PMOS linear charge current limit is increased to about 0.8A while VOUT rises to 3.3V (if VIN is higher than 3.3V). This circuit helps limit the output current under short-circuit conditions. Once the output voltage reaches VIN, the linear charging period elapses, and the device starts switching. VOUT starts to rise under the control of the internal soft start (SS). In boost switching conditions, the current limit is 3.6A, typically. When the output voltage is higher than VIN, the MP3414A powers its internal circuits from VOUT instead of VIN. This allows strong driving capabilities and high efficiency, even if VIN drops as low as 1.8V. Soft Start (SS) The MP3414A provides a soft start (SS) by charging an internal capacitor with a current source. During the linear charge period, the SS signal keeps rising, following FB. Once the linear charge elapses, the voltage on the SS capacitor is charged and ramps up the reference voltage based on the internal fixed slew-rate. The SS capacitor is discharged completely during a commanded shutdown, thermal shutdown, or short circuit at the output. Device Enable (EN) The device begins operating if EN is set higher than 1.2V. It enters shutdown mode if EN is lower than 0.4V. In shutdown mode, the regulator stops switching, all internal control circuits switch off, and the output disconnects from the input completely. Power-Save Mode (PSM) The MP3414A enters power-save mode (PSM) automatically when the load decreases. It switches back to PWM mode when the load increases. In PSM, the converter stretches the frequency down to save switching and driver losses. In addition, the switch frequency is stretched down too when the input voltage is close to the output voltage (which triggers the minimum on-time if kept at a 1MHz frequency). This helps decrease the output ripple by avoiding group-pulse mode. Under a very lightload condition, the MP3414A continues to run in group-pulse mode to regulate the output voltage and save more power. Error Amplifier (EA) The error amplifier (EA) is an internally compensated amplifier. The EA compares the internal 0.6V reference voltage against VFB to generate an EA signal, which in turn controls VOUT. The output voltage of the MP3414A is adjusted via FB by an external resistor divider. See Equation (1): VOUT 0.6V (1 R1 ) R2 (1) Setting a high value for R1 and R2 achieves a low quiescent current. However, a resistance set too high will be sensitive to noise and lead to a low loop bandwidth. Set the R1 value between 499kΩ to 1MΩ for good leakage, stability and transient balance. Current Sensing In a linear charge condition, the high-side PMOS current is sensed and compared with the current limit threshold. The compared output manages the linear charge current. In a boost switching condition, lossless current sensing converts the NMOS switch current signal to a voltage that is summed with the internal slope compensation. The summed signal is compared with the EA output to provide a peak current control command for the PWM. The peak switch current is limited to approximately 3.6A. The switch current signal is MP3414A Rev. 1.1 www.MonolithicPower.com 6/26/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 12 MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT blanked for 60ns internally to enhance noise immunity. Output Disconnect The MP3414A is designed to allow a true output disconnect by eliminating body diode conduction of the internal PMOS rectifier. This allows VOUT to reach 0V during shutdown, drawing zero current from the input source. This also allows for inrush current limiting at start-up, which minimizes the surge current seen by the input supply. To obtain the advantages of the output disconnect, there must NOT be an external Schottky diode connected between SW and VOUT. Over-Voltage Protection (OVP) If the voltage on VOUT is higher than the typical 6V threshold, the boost switching stops. After the output drops to about 5.7V, the switching recovers automatically. This protects the internal power MOSFET from over-voltage stress. Thermal Shutdown (TSD) The device has an internal temperature monitor. If the die temperature exceeds 155°C, the converter turns off. Once the temperature drops below 130°C, the converter restarts. Overload (OLP) and Short-Circuit Protection (SCP) When an overload or a short circuit occurs, the output voltage drops. If VOUT drops below VIN (0.3V), the MP3414A stops for about 50µs and then runs in a linear charge mode at start-up. If the overload or short circuit is removed, the MP3414A restarts automatically under SS control. MP3414A Rev. 1.1 www.MonolithicPower.com 6/26/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 13 MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT APPLICATION INFORMATION ΔIL = Acceptable inductor current ripple COMPONENT SELECTION Typically, the inductor current ripple is set to 30% to 50% of the maximum inductor current. Maintain a low DCR (series resistance of the inductor) to reduce resistive power loss. The saturated current (ISAT) should be large enough to support the peak current. Input Capacitor Selection Low equivalent series resistance (ESR) input capacitors reduce input switching noise and reduce the peak current drawn from the battery. Ceramic capacitors are recommended for input decoupling and should be placed as close to the device as possible. A ceramic capacitor larger than 10μF is recommended to limit the VIN ripple. Output Capacitor Selection To ensure stability over the full operating range, the output capacitor requires a minimum capacitance value of 22μF at the programmed output voltage. A higher capacitance value may be required to lower the output and transient ripple. Low ESR capacitors such as X5R or X7R type are recommended. Supposing the ESR is zero, use Equation 2 to calculate the minimum output capacitor to support the ripple in the PWM mode: CO IO (VOUT(MAX) VIN(MIN) ) fS V OUT(MAX) ΔV (2) VOUT(MAX) = Maximum output voltage VIN(MIN) = Minimum input voltage IO = Output current fS = Switching frequency ΔV = Acceptable output ripple A 1μF ceramic capacitor is recommended between VOUT and PGND with a short loop. This reduces spikes on the SW node and improves EMI performance. Inductor Selection The MP3414A utilizes small surface mounted chip inductors due to its 1MHz switching frequency. Inductor values between 1μH and 2.2μH are suitable for most applications. Larger values of inductance allow for slightly greater output current capabilities by reducing the inductor ripple current. However, larger value inductances will increase the component size. The minimum inductance value is given using Equation (3): L VIN(MIN) (VOUT(MAX) VIN(MIN) ) VOUT(MAX) IL fS PCB Layout Guidelines Efficient PCB layout is critical for highfrequency switching power supplies. Poor layout can result in reduced performance, excessive EMI, resistive loss, system instability, and even over-voltage stress. For best results, refer to Figure 2 and follow the guidelines below: 1. Place the output capacitor as close as possible to OUT with minimal distance to PGND. A small decoupling capacitor should be in parallel with the bulk output capacitor. 2. Place the small decoupling capacitor as close as possible to OUT and PGND. This is very important to reduce the spikes on SW and improve EMI performance. 3. Place the input capacitor and inductor as close as possible to IN and SW. The trace between the inductor and SW should be as wide and short as possible. 4. Place the feedback loop far away from all noise sources (such as SW). The feedback divider resistors should be as close as possible to FB and AGND. 5. Tie the ground return of the input/output capacitors as close as possible to PGND using a large copper GND area. Vias around GND are recommended to lower the die temperature. (3) MP3414A Rev. 1.1 www.MonolithicPower.com 6/26/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 14 MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT Top Layer Design Example Bottom Layer Via R1 R2 Table 1: Design Example L1 MP3414A C2A C1 C2B VIN See Table 1 below for a design example following the application guidelines for the specifications below: GND VOUT GND Figure 2: Recommended PCB Layout VIN VOUT IOUT 2.8V-4.2V 5V 0A-1A The typical application circuit for VOUT = 5V in Figure 3 shows the detailed application schematic and the basis for the typical performance waveforms. For additional detailed device applications, please refer to the related evaluation board datasheet (EVB). MP3414A Rev. 1.1 www.MonolithicPower.com 6/26/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 15 MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT TYPICAL APPLICATION CIRCUITS L1 1.5μH SW VOUT OUT R1 1MΩ VIN IN C2A 22μF GND R2 137kΩ EN GND GND FB R3 100k PGND C1 10μF U1 MP3414A C2B 1μF AGND GND GND Figure 3: Typical Boost Application Circuit, VIN = 2.8V to 4.2V, VOUT = 5V, IOUT = 0A-1A L1 1.5μH SW VOUT OUT R1 1MΩ VIN IN GND GND FB C2A 22μF GND R2 220k Ω R3 100k EN PGND C1 10μF U1 MP3414A C2B 1μF AGND GND GND Figure 4: Typical Boost Application Circuit, VIN = 1.8V to 3V, VOUT = 3.3V, IOUT = 0A-1A MP3414A Rev. 1.1 www.MonolithicPower.com 6/26/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 16 MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT PACKAGE INFORMATION TSOT23-8 See note 7 EXAMPLE TOP MARK PIN 1 ID IAAAA RECOMMENDED LAND PATTERN TOP VIEW SEATING PLANE SEE DETAIL ''A'' FRONT VIEW SIDE VIEW NOTE: DETAIL ''A'' 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) JEDEC REFERENCE IS MO-193, VARIATION BA. 6) DRAWING IS NOT TO SCALE. 7) PIN 1 IS LOWER LEFT PIN WHEN READING TOP MARK FROM LEFT TO RIGHT, (SEE EXAMPLE TOP MARK). 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. MP3414A Rev. 1.1 www.MonolithicPower.com 6/26/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2017 MPS. All Rights Reserved. 17