BUCK CONVERTER. AMS4155 Datasheet

AMS4155 CONVERTER. Datasheet pdf. Equivalent

Part AMS4155
Description 2A OUTPUT PWM BUCK CONVERTER
Feature www.DataSheet4U.com Advanced Monolithic Systems AMS4155 2A OUTPUT PWM BUCK CONVERTER RoHS complia.
Manufacture Advanced Monolithic Systems
Datasheet
Download AMS4155 Datasheet



AMS4155
www.DataSheet4U.com
Advanced
Monolithic
Systems
FEATURES
Stable with low ESR Output Ceramic Capacitors
Up to 95% Efficiency
2A Continuous Output Current
Wide 4.75V to 20V Operating Input Range
Fixed 480kHz Frequency
Thermal Shutdown
Cycle-by-cycle + hiccup Over Current Protection
Under Voltage Lockout
Frequency Synchronization Input
Operating Temperature: -40°C to 125°C
Available in an 8-Pin SO Package
AMS4155
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
GENERAL DESCRIPTION
The AMS4155 is a monolithic step down switch mode converter with a built in internal power Switch Transistor. It achieves 2A
continuous output current over a wide input supply range with excellent load and line regulation.
Current mode operation provides fast transient response and eases loop stabilization. Fault condition protection includes cycle-
by-cycle current limiting and thermal shutdown. In shutdown mode the regulator draws 17µA of supply current.
ORDERING INFORMATION
OUTPUT PACKAGE TYPE TEMP. RANGE
VOLTAGE 8 Lead SOIC
Adjustable AMS4155S
-25°C to 125°C
TYPICAL APPLICATION
PIN CONNECTIONS
INPUT
470µF/
10µF CER
ON EN
OFF
VIN BST
32
8
AMS4155
1µF
LX
4
SYNC 1
5
GND
7
COMP
6 F/B
10nF
10 µH
B230A
5k
OUTPUT
5V/3A
30k
10k
40µF
ceramic
8L SOIC
SO Package (S)
SYNC 1
BST 2
VIN 3
LX 4
8 EN
7 COMP
6 FB
5 GND
Top View
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723



AMS4155
www.DataSheet4U.com
PIN DESCRIPTION
Pin Number
NAME
1 SYNC
2 BST
3 VIN
4 LX
5 GND
6 FB
7 COMP
8 ENABLE
AMS4155
DESCRIPTION
Synchronization Input. This pin is used to synchronize the internal oscillator frequency to
an external source. Leave SYNC unconnected or connect to GND if unused.
Bootstrap. This capacitor is needed to drive the power switch above the supply voltage. It
is connected between LX and BST pins to form a floating supply across the power switch
driver. The voltage across Cbst is about 5V and is supplied by the internal Vcc supply
when LX pin voltage is low.
Supply Voltage. The AMS4155 operates from a+4.75V to +23V unregulated input. Cin is
needed to prevent large voltage spikes from appearing at the input power supply.
This connects the inductor to the internal Switch
Ground Pin connected to PCB ground plane. This pin is also the ground for internal voltage
reference.
Feedback. A resistor network of two resistors is used to set-up the output voltage connected
between Output to GND. The node between the two resistors is connected to Feedback pin.
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 2.495V at this pin enables device operation.
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723





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