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Advanced Monolithic Systems
FEATURES
* 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
AMS4154
2A OUTPUT PWM BUCK CONVERTER
RoHS compliant
APPLICATIONS
* 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 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.
ORDERING INFORMATION
OUTPUT VOLTAGE Adjustable PACKAGE TYPE 8 Lead SOIC AMS4154S -25C to 125C TEMP. RANGE
TYPICAL APPLICATION
PIN CONNECTIONS
8L SOIC SO Package (S)
VIN
ON OFF
BST
470n L1 2.5V/2A
EN
LX
4.7H 31.7K
BST VIN LX GND
1 2 3 4
8 REF 7 EN 6 COMP 5 F/B
COMP
10F 3.9K
VREF
22F
GND
F/B
B220
10K
Top View
4.7n
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS4154
PIN DESCRIPTION
AMS4154 PIN NUMBERS 1 NAME BST DESCRIPTION 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. 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. Switch. This connects the inductor to VIN through the internal power switch. 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. Feedback. An external resistor divider from the output to GND, tapped to the FB pin sets the output voltage. 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. 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. 5V reference voltage capable of supplying 1mA for other external circuits.
2 3 4 5 6
VIN LX GND FB COMP
7 8
EN REF
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
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 +150C -65C to +150C 260C
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at TA= 25 C and VIN=12V (unless otherwise noted). PARAMETER Feedback Voltage Supply Current Shutdown Supply Current Current Limit 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 280 VFB = 1.0V VFB = 1.5V VEN Rising, Output ON VEN Falling , Output OFF VEN = 0V IREF = 0 IREF = 0 to 1mA IREF = 100A, VIN = 6.5 to 32V 4.8 TEST CONDITIONS 0.6V VIN 32V, VCOMP < 2V VEN = 5V, VFB = 1.4V VEN = 0V 2.5 Min. 0.588 AMS4154 Typ. 0.600 1.0 0.5 3.6 3.5 330 90 0 2.6 2.2 250 1.8 160 5.0 100 30 380 99 2.8 2.3 Max. 0.612 1.2 1 4.9 Units V mA A A A/V KHz % % V V mV A C V mV mV
2.5
5.2
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS4154
TYPICAL WAVEFORM
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
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 5 8
0.123 (3.12) 0.137 (3.48) 7 6
5
0.228-0.244 (5.791-6.197)
0. 150-0.157** (3.810-3.988)
0.090 (2.28) 0.102 (2.59)
1
2
3
4
1
2
3
4
0.053-0.069 (1.346-1.752)
0.010-0.020 x 45 (0.254-0.508) 0.004-0.010 (0.101-0.254) 0.008-0. 010 (0.203-0.254) 0-8 TYP
0.014-0.019 (0.355-0.483)
0.050 (1.270) TYP
0.016-0.050 (0.406-1.270)
S (SO- 8 ) AMS DRW# 042293
0.024(0.61) 0.063(1.60)
0.050(1.27)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **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. www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723

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