AMS4154 [ADMOS]
2A OUTPUT PWM BUCK CONVERTER; 2A输出PWM降压转换器
| 型号： | AMS4154 |
| 厂家： | 
ADVANCED MONOLITHIC SYSTEMS |
| 描述： | 2A OUTPUT PWM BUCK CONVERTER |
| 文件： | 总5页 (文件大小：277K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Advanced
Monolithic
Systems
AMS4154
2A OUTPUT PWM BUCK CONVERTER
RoHS compliant
FEATURES
APPLICATIONS
• Stable with low ESR Output Ceramic Capacitors
• Battery Chargers
• Up to 99% On time
• 2A Output Current
• Portable (Notebook) Computers
• Industrial power supply
• Wide Operating Input Voltage Range 5.5V to 32V
• Fixed 330 kHz Frequency
• Point of regulation for high performance electronics
• Consumer Electronics
• Thermal Shutdown
• Audio Power Amplifiers
• Cycle-by-cycle Over Current Protection
• Under Voltage Lockout
• Distributed Power Systems
• Pre-Regulator for Linear Regulators
• LCD TVs and LCD monitors
• Automotive electronics
• 5V reference output
• Adjustable output from 0.6V
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 8 Lead SOIC
Adjustable AMS4154S
PACKAGE TYPE
TEMP. RANGE
-25°C to 125°C
TYPICAL APPLICATION
PIN CONNECTIONS
8L SOIC
SO Package (S)
BST
LX
VIN
470n
L1
2.5V/2A
ON
1
2
3
4
8
7
6
5
BST
VIN
LX
REF
OFF
EN
4.7µH
EN
COMP
31.7K
F/B
VREF
GND
COMP
22µF
3.9K
4.7n
10µF
F/B
GND
Top View
10K
B220
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723
AMS4154
PIN DESCRIPTION
AMS4154
PIN
NAME
DESCRIPTION
NUMBERS
1
BST
VIN
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
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
4
LX
Switch. This connects the inductor to VIN through the internal power switch.
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
6
FB
Feedback. An external resistor divider from the output to GND, tapped to the FB pin sets
the output voltage.
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
8
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.
REF
5V reference voltage capable of supplying 1mA for other external circuits.
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723
AMS4154
ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage
-0.3V to +34V Junction Temperature
-1V to VIN + 0.3V Storage Temperature
+150°C
-65°C to +150°C
260°C
SW Voltage
BS Voltage
V LX – 0.3V to V LX + 6V Lead Temperature
-0.3V to +6V
All Other Pins
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at TA= 25 °C and VIN=12V (unless otherwise noted).
AMS4154
PARAMETER
Feedback Voltage
TEST CONDITIONS
Units
Min.
Typ.
Max.
0.6V ≤ VIN ≤ 32V, VCOMP < 2V
0.588
0.600
0.612
V
1.0
1.2
mA
VEN = 5V, VFB = 1.4V
VEN = 0V
Supply Current
Shutdown Supply Current
Current Limit
0.5
3.6
1
4.9
µA
A
2.5
Current Sense to COMP
3.5
A/V
Transconductance
Oscillation Frequency
280
2.5
330
90
380
99
KHz
%
VFB = 1.0V
VFB = 1.5V
VEN Rising, Output ON
VEN Falling , Output OFF
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
0
%
2.6
2.2
250
1.8
160
5.0
100
30
2.8
2.3
V
V
mV
µA
ºC
VEN = 0V
IREF = 0
4.8
5.2
V
∆IREF = 0 to 1mA
IREF = 100µA, VIN = 6.5 to 32V
mV
mV
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)
0.123 (3.12)
0.137 (3.48)
8
7
6
5
8
7
6
5
0.228-0.244
0.150-0.157**
(3.810-3.988)
0.090 (2.28)
0.102 (2.59)
(5.791-6.197)
1
2
3
4
1
2
3
4
0.010-0.020
x45°
0.053-0.069
(0.254-0.508)
(1.346-1.752)
0.004-0.010
0.008-0.010
(0.101-0.254)
0°-8 ° TYP
(0.203-0.254)
0.014-0.019
(0.355-0.483)
0.050
0.016-0.050
(1.270)
TYP
(0.406-1.270)
S(SO- 8 ) AMS DRW# 042293
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
0.024(0.61)
0.063(1.60)
0.050(1.27)
**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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