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Advanced Monolithic Systems AMS4154 2A OUTPUT PWM BUCK CONVERTER RoHS compliant FEATURES APPLICATIONS • Stable with low ESR Output Ceramic Capacitors • Up to 99% On time • 2A Output Current • Wide Operating Input Voltage Range 5.5V to 32V • Fixed 330 kHz Frequency • Thermal Shutdown • Cycle-by-cycle Over Current Protection • Under Voltage Lockout • 5V reference output • Adjustable output from 0.6V • Battery Chargers • Portable (Notebook) Computers • Industrial power supply • Point of regulation for high performance electronics • Consumer Electronics • Audio Power Amplifiers • Distributed Power Systems • Pre-Regulator for Linear Regulators • LCD TVs and LCD monitors • Automotive electronics GENERAL DESCRIPTION The AMS4154 is a 2A step-down converter for high voltage applications. Current mode operation provides easier compensation and fast transient response. Internal cycle-by-cycle current limiting and thermal shutdown provides the necessary protection in faults situation. A 5V reference voltage is available that can supply up to 2mA current. Available in 8-pin SOIC EDP package. www.BDTIC.com/AMS ORDERING INFORMATION OUTPUT PACKAGE TYPE VOLTAGE 8 Lead SOIC EDP Adjustable AMS4154S TYPICAL APPLICATION TEMP. RANGE -25°C to 125°C PIN CONNECTIONS 8L SOIC SO Package (S) BST 1 8 REF VIN 2 7 EN LX 3 6 COMP GND 4 5 F/B Top View Paddle is GND Advanced Monolithic Systems, Inc. http://www.BDTIC.com/AMS AMS4154 PIN DESCRIPTION AMS4154 PIN NUMBERS NAME DESCRIPTION 1 BST Bootstrap. A capacitor is needed to drive the power switch’s drive above the supply voltage. It is connected between LX and BST pins to form a floating supply across the power switch driver. 2 VIN Supply Voltage. The AMS4154 operates from a+5.5V to +32V unregulated input. C1 is needed to prevent large voltage spikes from appearing at the input. 3 LX Switch. This connects the inductor to VIN through the internal power switch. 4 GND Ground. This pin is the ground for voltage reference and for the regulated output voltage. For this reason care must be taken in its layout. 5 FB Feedback. An external resistor divider from the output to GND, tapped to the FB pin sets the output voltage. 6 COMP Compensation. This node is the output of the transconductance error amplifier and the input to the current comparator. Frequency compensation is done at this node by connecting a series R-C to ground. 7 EN Enable. A voltage greater than 2.5V enables operation. For complete low current shutdown the EN pin voltage needs to be less than 2.3V. 8 REF www.BDTIC.com/AMS 5V reference voltage capable of supplying 1mA for other external circuits. Advanced Monolithic Systems, Inc. http://www.BDTIC.com/AMS AMS4154 ABSOLUTE MAXIMUM RATINGS Input Supply Voltage SW Voltage BS Voltage All Other Pins -0.3V to +34V -1V to VIN + 0.3V V LX – 0.3V to V LX + 6V -0.3V to +6V Junction Temperature Storage Temperature Lead Temperature +150°C -65°C to +150°C 260°C ELECTRICAL CHARACTERISTICS Electrical Characteristics at TA= 25 °C and VIN=12V (unless otherwise noted). PARAMETER TEST CONDITIONS Min. AMS4154 Typ. Max. 1.202 1.230 1.258 V Units Feedback Voltage 12V ≤ VIN ≤ 32V, VCOMP < 2V Supply Current VEN = 2.6 V, VFB = 1.4V 2.0 3.5 mA Shutdown Supply Current VEN = 0V 0.5 1 µA 3.6 3.9 A Current Limit 2.5 Current Sense to COMP Transconductance Oscillation Frequency Maximum Duty Cycle Minimum Duty Cycle EN Threshold Voltage EN Threshold Voltage EN Threshold Hysteresis Enable Current Thermal Shutdown 5V REF Voltage REF Load Regulation REF Line Regulation 5.0 280 VFB = 1.0V VFB = 1.5V VEN Rising, Output ON VEN Falling , Output OFF 330 90 0 2.6 2.2 100 1.8 160 5.0 50 30 www.BDTIC.com/AMS 2.5 VEN = 0V IREF = 0 ∆IREF = 0 to 1mA IREF = 100µA, VIN = 6.5 to 32V 4.8 A/V 380 99 2.8 2.3 5.2 KHz % % V V mV µA ºC V mV mV Advanced Monolithic Systems, Inc. http://www.BDTIC.com/AMS AMS4154 TYPICAL APPLICATION 12Input to 5v Output VIN www.BDTIC.com/AMS F/B GND L1 COMP off 3.3V VOUT C1 on 22µH LX EN VIN REF BST R2 220n 3K C3 10µ + C4 68µ R3 1K C5 + 470µ C6 C7 22n 100n C1 100n D1 B220 R1 1K 24 Input to 3.3VOutput @2A Advanced Monolithic Systems, Inc. http://www.BDTIC.com/AMS AMS4154 TYPICAL PERFORMANCE www.BDTIC.com/AMS Advanced Monolithic Systems, Inc. http://www.BDTIC.com/AMS AMS4154 TYPICAL PERFORMANCE Output Variation due to Supply (1A Load) Reference Output Load Regulation 0 Voltage Coefficient PPM 300 -0.5 200 -1 % 100 0 0 5 10 15 20 25 30 -1.5 -100 -2 -200 -300 -2.5 0 -400 Efficiency for 5V Output with 12V Input 0.001 0.002 0.003 0.004 0.005 Switching Output at 1A Efficiency Int Diode Ext Diode Ext Diode 22uH 90 88 86 % www.BDTIC.com/AMS 84 82 80 78 76 0.5 1 1.5 2 2.5 3 Load A Start Up into 1A resistive Load Output Stop into 1A resistive Load Advanced Monolithic Systems, Inc. http://www.BDTIC.com/AMS AMS4154 TYPICAL PERFORMANCE (continued) Rise Time at Switching node and 1A Load Load Transient response 0.5-2.5A 1µS Rise/Fall Time Compensation 4.7k/4.7n Fall Time at Switching node and 1A Load Load Transient 1.5-1.5A 1µS Rise/Fall Time Compensation 1.7k/4.7n www.BDTIC.com/AMS No Load Waveform Output Ripple as 3A for 5V Output 2x 10µF ceramic Output and 10µH inductor Advanced Monolithic Systems, Inc. http://www.BDTIC.com/AMS AMS4154 PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted. 8 LEAD SOIC PLASTIC PACKAGE (S) 0.189-0.197* (4.801-5.004) 8 7 6 8 5 0.228-0.244 (5.791-6. 197) 5 0. 150-0.157** (3.810-3.988) 1 2 3 0.090 (2.28) 0.102 (2.59) 1 4 2 3 4 0.010-0.020 x 45° (0.254-0.508) 0.053-0.069 (1.346-1.752) 0.004-0.010 (0.101-0.254) 0.014-0.019 (0.355-0.483) 0.024(0.61) 0.123 (3.12) 0.137 (3.48) 7 6 0.050 (1.270) TYP 0.008-0. 010 (0.203-0. 254) 0°-8 ° TYP 0.016-0.050 (0.406-1.270) S (SO- 8 ) AMS DRW# 042293 www.BDTIC.com/AMS *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE 0.050(1.27) 0.063(1.60) **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 0.105(2.67) 0.213(5.41) 0.138 (3.50) RECOMMENDED LAYOUT PATTERN Advanced Monolithic Systems, Inc. http://www.BDTIC.com/AMS