MT3410L.pdf

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1.3A 2.3V-6V Input 1.5MHz Synchronous Step-Down Converter
AEROSEMI MT3410L 13A, 1. 5MHZ Synchronous Step-Down Converter ELECTRICAL CHARACTERISTICS(Note 3) IN=VEn=3.6, VouT=1.8V, TA= 25C, unless otherwise noted. PARAL MET TER CONDITIONS MINTYPMAXUNIT Input voltage range 23 UVLO Threshold 1.7 Input DC Supply Current ( Note 4) A PWM Mode 0r=90%,l10A0=0mA 140 300 HA PFM Mode Vour=105%, LLoAD =OmA 35 70 IA Shutdown mode =0V,V=42V 0.1 A 25°0 Regulated Feedback 058806000612 A=0C≤T≤85C 0586 0.6 0.6 Voltage Vp T=-40°C≤T。≤85°0 0.585 0.600 0.615 Reference voltage Line Vu=2.5v to 6v 0.04 040% Regulation Output Voltage Line Vu=2.5v to 6v 0.04 0.40 Regulation Output Voltage Load 0.5 Requlation % Oscillation Frequency OUI 100% 15 MHz VouT=0 OUT 300 kHz On resistance of pmos 100mA 130 200 m On resistance of nmos 100mA 100 200 mo Peak current limit I VIN=3V, VouT=90% A EN Threshold 0301.0150 EN Leakage Current ±0.01 ±10 A SW Leakage Current VEn=OV,VIn=V sw=5V ±0.01 ±1.0 A Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired Note 2: T, is calculated from the ambient temperature T a and power dissipation Pp according to the following formula: T,= TA +(PD)X (250C/) lote 3: 100% production test at +25C. Specifications over the temperature range are guaranteed by design and characterization Note 4: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency MT3410L Rev 1.0 www.aeroseml.com Aerosemi Proprietary Information. Unauthorized Photocopy and Duplication Prohibited All Rights Reserved AEROSEMI MT3410L 13A, 1. 5MHZ Synchronous Step-Down Converter TYPICGL PERFORMGNCE CHARACTERISTICS Effi-1.8V Output Effi--33V Output 85.00 4.2 C.00 91.9甲98颈08750.,11第01221150 Load Vs Output Oscillator Frequency vs Temperature TCo 1600 2150一 1500 E14C0 1300 s、8y 12C0 48-32-160163248648096 061 vn=3.6 Outat, 8v VOUTFlout=50mA 05 十++++++++++ 0595 SCLTTIDNE C.]-2000020040D600E0[1000120 400s/D MT3410L Rev 1.0 www.aeroseml.com Aerosemi Proprietary Information. Unauthorized Photocopy and Duplication Prohibited All Rights Reserved AEROSEMI MT3410L 13A, 1. 5MHZ Synchronous Step-Down Converter UNCTIONGL BLOCK DIAGRAM osc Current limit Shutdown Detector Control PWM/PFM Mode Detector Compensation Senso PWM Control Logic Driver SW FB Compactor Amplifier Zero detecto GND UVlO power Good detector Figure 2. MT3410L Block Diagram UNCTIONGL DESCRIPTION MT341OL is a synchronous buck regulator IC adjustable version can be programmed with that integrates the PWM PFM control, high -side external feedback to any voltage, ranging from and low-side MOSFeTs on the same die to 0.6v to the input voltage at dropout operation, the minimize the switching transition loss and converter duty cycle increases to 100%and the conduction loSS With ultra low RDSIoN power output voltage tracks the input voltage minus the switches and proprietary PWM control, this Rosion drop of the high-side MOSFeT. The internal regulator ic can achieve the highest efficiency error amplifier and compensation provides and the highest switch frequency simultaneously excellent transient response, load and line to minimize the external inductor and capacitor regulation. Soft start function prevents input size, and thus achieving the minimum solution inrush current and output overshoot during start footprint. The MT3410L requires only three external power components(CiN, Cour and L). The MT3410L Rev 1.0 www.aeroseml.com Aerosemi Proprietary Information. Unauthorized Photocopy and Duplication Prohibited All Rights Reserved AEROSEMI MT3410L 13A, 1. 5MHZ Synchronous Step-Down Converter APPLICATIONS INFORMATION Setting the Output Voltage Output Capacitor Selection he internal reference voltage VREF iS 0.6V The output capacitor is required to keep the (typical), the output voltage is set by a output voltage ripple small and to ensure resistive divider according to the following regulation loop stability. The output capacitor formula must have low impedance at the switching R1 frequency. Ceramic capacitors with X5R or X7R OUT 0.6×1 dielectrics are recommended due to their low R2 ESR and high ripple current ratings. The output The external resistive divider is connected to the ripple A vour is determined by output, allowing remote voltage sensing as shown in Figure 1 ESR V× fcA x l 8×fsc×C OUT Inductor Selection A 10uF ceramic can satisfy most applications For most designs, the MT3410L operates with nductors of 1uh to 4.7HH. Low inductance PCB Layout Recommendations values are physically smaller but require faster When laying out the printed circuit board, the switching, which results in some efficiency loss following checking should be used to ensure The inductor value can be derived from the proper operation of the Mt341OL Check the following equation following in your layout The power traces, consisting of the gND OUT trace. the sw trace and the vin trace should △L×t OSC be kept short, direct and wide Where A I is inductor ripple Current. Large Does the(+)plates of cn connect to Vin as value inductors result in lower ripple current and closely as possible This capacitor provides small value inductors result in high ripple current the ac current to the internal power For optimum voltage-positioning load transients MOSFETS choose an inductor with dc series resistance in Keep the switching node, SW, away from the50mΩt150 mQ range the sensitive Vour node Keep the(-) plates of CIn and c our as close nput Capacitor Selection as possible With the maximum load current at 1. 3A. the IA TO vor maximum ripple current through input capacitor is about 0.6Arms a typical X7R or better grade VIA TO VIN ceramic capacitor with 6v rating and greater than 10uF capacitance can handle this ripple current MI3410L well. To minimize the potential noise problem, place this ceramic capacitor really close to VIN and gnd pins. Care should be taken to Vcr minimize the loop aera formed by Cr, and VIN/GND pins Figure 3. MT3410L Suggested Layout MT3410L Rev 1.0 www.aeroseml.com Aerosemi Proprietary Information. Unauthorized Photocopy and Duplication Prohibited All Rights Reserved AEROSEMI MT3410L 13A, 1. 5MHZ Synchronous Step-Down Converter PACHAGE DESCRIPTION SOT23-5 5LD SOT-23 PACKAGE OUTLINE DIMENSIONS Dimension Min Max EXAMPLE A1 004 0.15 TOP MARK 009 0.2 AAAA 2.5 1.5 1.7 1.90 REF IN 1 035 TOP VIEW ,+m Al SIDEⅦI TE. NOT 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3 DIMENSIONS ARE INCLUSIVE OF PLATING 4 DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR MT3410L Rev 1.0 www.aeroseml.com Aerosemi Proprietary Information. Unauthorized Photocopy and Duplication Prohibited All Rights Reserved AEROSEMI MT3410L 13A, 1. 5MHZ Synchronous Step-Down Converter IMPORTANT NOTICE Xi an Aerosemi T echnology co . Ltd reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services Xi an Aerosemi Technology co, Ltd is not responsible or liable for such altered documentation Information ot third parties may be subject to additional restrictions Xi an Aerosemi Technology co Ltd does not assume any responsibility for use of any its products for any particular purpose, nor does Xi an Aerosemi Technology co, Ltd assume any liability arising out of the application or use of any its products or circuits Copyright o 2011, Xi'an Aerosemi Technology co, Ltd Te!:0755-8287961602150871055029-88868021 Http://www.aerosemi.com E-Mail: salesaaerosemi com MT3410L Rev 1.0 www.aeroseml.com Aerosemi Proprietary Information. Unauthorized Photocopy and Duplication Prohibited All Rights Reserved

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