MP3221 MPS | Alldatasheet
Document overview
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Technical content
2.7A, 1.2MHz, High-Efficiency Step-Up Converter With Input Disconnect MP3221 Rev. 1.0 www.MonolithicPower.com 1 9/23/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved.
DESCRIPTION
The MP32 21 is a 1.2MHz frequency, 6-pin TSOT23 current mode step up converter intended for small, low power applications. The device can step up three -cell alkaline, NiCd, and NiMH batteries, or a single -cell Li -on battery up to 6V. It is capable of delivering 1A output current at 5V with a supply voltage of 3V. The MP3221 provides the internal soft start and compensation to minimize the external component count and help producing a compact solution . I t integrates a FAULT driver for external PMO S to disconnect the output from input when the part shuts down or in output short circuit condition. This disconnect feature allows the output to be completely discharged, thus allowing the part to draw less than 1µA off current in shutdown mode. The MP32 21 is available in a small 6pin TSOT23 package.
FEATURES
Integrated 88mΩ Power MOSFET 270µA Quiescent Current 2.5V to 6V Input Voltage 3V to 6V Output Voltage 1.2MHz Fixed Switching Frequency Internal 2.7A Switch Current Limit Integrated Input Disconnect Driver Internal Soft Start and Compensation True Output Disconnect from Input Under Voltage Lockout Short-Circuit Protection Over-Temperature Protection Available in a 6-Pin TSOT23-6 Package
APPLICATIONS
Single-Cell Lion Battery or Three-Cell Alkaline, NiCd, or NiMH Battery Based Products Portable Media Players Wireless Peripherals Tablets and Smart Phones 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
MP3221–2.7A, 1.2MHZ, HIGH-EFFICIENCY STEP UP CONVERTER WITH INPUT DISCONNECT MP3221 Rev. 1.0 www.MonolithicPower.com 2 9/23/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved.
ORDERING INFORMATION
Part Number* Package Top Marking MP3221GJ TSOT23-6 AFB * For Tape & Reel, add suffix –Z (e.g. MP3221GJ–Z); PACKAGE REFERENCE FAULT6 ENFB GND SW IN TSOT23-6 ABSOLUTE MAXIMUM RATINGS (1) –0.3V(-2V for <10nS)to +8V(9V for <10nS) Continuous Power Dissipation(TA = +25°C) (2) Recommended Operating Conditions (3) Operating Junction Temp.(TJ) .. -40°C to +125°C Thermal Resistance (4) θJA θJC TSOT23-6 ……. 220 110 °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 T J (MAX), the junction -to- ambient thermal resistance θ JA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calc ulated by P D (MAX) = (T J (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.
MP3221–2.7A, 1.2MHZ, HIGH-EFFICIENCY STEP UP CONVERTER WITH INPUT DISCONNECT MP3221 Rev. 1.0 www.MonolithicPower.com 3 9/23/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS
VIN = VEN = 3.3V, TA = 25°C, unless otherwise noted. Parameter Symbol Condition Min Typ Max Units Operating Input Voltage VIN 2.5 6 V IN Under Voltage Lockout VUVLO VIN Rising 2.0 2.2 2.4 V IN Under Voltage Lockout Hysteresis 225 mV Shutdown Current ISD VEN = 0V 0.15 µA Quiescent Current VFB = 0.85V, No Switching 270 µA Switching Frequency fSW 1 1.2 1.4 MHz Minimum On time(5) TON,MIN 80 ns Maximum Duty Cycle DMAX VFB = 0.6V 90 % EN Input High Voltage VEN_H 1.3 V EN Input Low Voltage VEN_L 0.5 V EN Input Bias Current VEN = 5V 4 µA FB Voltage VFB VEN = 5V 0.780 0.796 0.812 V FB Input Bias Current VFB = 0.82V –50 –10 nA FAULT Detection Threshold Voltage VFB-AULT Step-up Converter Fails 110 150 185 mV FAULT Pull Down Current IFAULT 85 115 145 µA FAULT Pin Output Low Voltage VFB=0.6V, I=30µA 0.3 V SW On Resistance RDS (ON) 88 mΩ SW Current Limit Duty Cycle = 40% 2.7 3.7 5.2 A SW Leakage VSW = 5V 1 µA Thermal Shutdown(5) TSHDN_TH 150 C Thermal Shutdown Hysteresis(5) TSHDN_HYS 20 C Notes: 5) Guaranteed by engineering sample characterization. not production tested.
MP3221–2.7A, 1.2MHZ, HIGH-EFFICIENCY STEP UP CONVERTER WITH INPUT DISCONNECT MP3221 Rev. 1.0 www.MonolithicPower.com 4 9/23/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. TYPICAL CHARACTERISTICS
MP3221–2.7A, 1.2MHZ, HIGH-EFFICIENCY STEP UP CONVERTER WITH INPUT DISCONNECT MP3221 Rev. 1.0 www.MonolithicPower.com 5 9/23/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS VIN = 3.3V, VOUT = 5V, L = 2.2µH, TA = 25°C, unless otherwise noted.
MP3221–2.7A, 1.2MHZ, HIGH-EFFICIENCY STEP UP CONVERTER WITH INPUT DISCONNECT MP3221 Rev. 1.0 www.MonolithicPower.com 6 9/23/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.3V, VOUT = 5V, L = 2.2µH, TA = 25°C, unless otherwise noted.
MP3221–2.7A, 1.2MHZ, HIGH-EFFICIENCY STEP UP CONVERTER WITH INPUT DISCONNECT MP3221 Rev. 1.0 www.MonolithicPower.com 7 9/23/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.3V, VOUT = 5V, L = 2.2µH, TA = 25°C, unless otherwise noted.
MP3221–2.7A, 1.2MHZ, HIGH-EFFICIENCY STEP UP CONVERTER WITH INPUT DISCONNECT MP3221 Rev. 1.0 www.MonolithicPower.com 8 9/23/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. PIN FUNCTIONS Pin # Name Description 1 SW Power Switch Output. SW is the drain of the internal MOSFET switch. Connect the power inductor and output rectifier to SW. 2 GND Ground. 3 FB Feedback Input. The FB voltage is 0.796V. Connect a resistor divider to FB. 4 EN Regulator On/Off Control Input. A high input at EN turns on the converter, and a low input turns it off. When not used, connect EN to the input supply for automatic startup. 5 IN Input Supply Pin. Must be locally bypassed.
6 FAULT (6)
Fault Disconnection Switch Gate Output. When the system starts up normally, this pin smoothly turns on the external PMOS. When the MP3221 is disabled or in fault condition , the external PMOS is turned off to disconnect the input and output. Notes: 6) Fault pin only can protect circuits in SCP condition after parts startup.
MP3221–2.7A, 1.2MHZ, HIGH-EFFICIENCY STEP UP CONVERTER WITH INPUT DISCONNECT MP3221 Rev. 1.0 www.MonolithicPower.com 9 9/23/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. FUNCTION DIAGRAM Figure 1: Functional Block Diagram
9/23/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. regulate voltage at the feedback pin. Figure 1. At the start of ea ch oscillating cycle error amplifier the power MOSFET is turned off. fault condition , if t hey are all in function.
MP3221–2.7A, 1.2MHZ, HIGH-EFFICIENCY STEP UP CONVERTER WITH INPUT DISCONNECT MP3221 Rev. 1.0 www.MonolithicPower.com 11 9/23/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved.
APPLICATION INFORMATION
Low ESR input capacitors reduce input switching noise and red uce the peak current drawn from the battery. Ceramic capacitors are good choice for input decoupling and it should be located as close as possible to the IN and GND pin. Add a ceramic capacitor larger than 10μF close to the IC. Selecting the Output Capacitor The output capacitor requires a minimum capacitance value of 22μF at the programmed output voltage to ensure stability over the full operating range. A higher capacitance value may be required to lower the output ripple and also the transient response. Low ESR capacitors, such as X5R - or X7R-type ceramic capacitors, are recommended. Assuming that the ESR is zero, estimate the minimum output capacitance to support the ripple in the CCM mode as: O OUT F IN(MIN) O S OUT F I (V V V )C f (V V ) V Where: VOUT = output voltage VIN(MIN) = Minimum Input voltage VF= Diode Forward voltage IO= Output current fS = Switching frequency ΔV= Acceptable output ripple Selecting the Inductor The inductor is required to force the higher output voltage while being driven by the input voltage. A larger value inductor results in less ripple current that results in lower peak inductor current, red ucing stress on the internal N - Channel.switch. However, the larger value inductor has a larger physical size, higher series resistance, and/or lower saturation current. A 2.2μH inductor is recommended for most applications. However, a more exact inductance value can be calculated. A good rule of thumb 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 75% of the current limit at the operating duty cycle to pr event loss of regulation due to the current limit. Also make sure that the inductor does not saturate under the worst -case load transient and startup conditions. Calculate the required inductance value by the equation: IN OUT F IN OUT F SW V (V V V )L (V V ) f I OUT LOAD(MAX) IN(MAX) IN VII V IN(MAX)I (30% 50%)I Where I LOAD(MAX) is the maximum load current, ΔI is the peak -to-peak inductor ripple current, and η is efficiency. Selecting the Diode The output rectifier diode supplies current to the inductor when the internal MOSFET i s off. To reduce power loss due to diode forward voltage and recovery current, use a Schottky diode with the MP3221. The diode should be rated for a reverse voltage equal to or higher than the output voltage. The average current rating must be higher than the maximum load current, and the peak current rating must be higher than the peak inductor current. Selecting the PMOS The MP3221 is capable of driving P -Channel power MOSFETS to disconnect input and output. The critical parameter selection of a MOSFET are: 1. Maximum drain to source voltage, VDS(MAX) 2. Maximum current ID(MAX) 3. On-resistance RDS(ON) 4. Total gate charge, QG. Ideally, the off -state voltage across the MOSFET is equal to the input voltage. V DS(MAX)
MP3221–2.7A, 1.2MHZ, HIGH-EFFICIENCY STEP UP CONVERTER WITH INPUT DISCONNECT NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications. Users should warrant and guarantee that third party I ntellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MP3221 Rev. 1.0 www.MonolithicPower.com 14 9/23/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved.
PACKAGE INFORMATION
PACKAGE OUTLINE DRAWING FOR 6L TSOT23 MF-PO-D-0011 revision 4.0 FRONT VIEW NOTE: 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 AB. 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) TOP VIEW RECOMMENDED LAND PATTERN SEATING PLANE SIDE VIEW DETAIL "A" SEE DETAIL ''A'' IAAAA PIN 1 ID See note 7 EXAMPLE TOP MARK