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AME5259A 데이터시트(PDF) 1 Page - Analog Microelectronics

부품명 AME5259A
상세설명  1.2A, 1.5MHz Synchronous Step-Down Converter
PDF  21 Pages
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제조업체  AME [Analog Microelectronics]
홈페이지  http://www.ame.com.tw/
Logo AME - Analog Microelectronics

AME5259A 데이터시트(HTML) 1 Page - Analog Microelectronics

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AME
1
AME5259A
Rev.A.02
1.2A, 1.5MHz Synchronous
Step-Down Converter
The AME5259A is a high efficiency monolithic synchro-
nous buck regulator using a constant frequency, current
mode architecture. Capable of delivering 1.2Aoutput cur-
rent over a wide input voltage range from 2.5V to 5.5V.
Supply current with no load is 400
µAand drops to<1µA
in shutdown. The 2.5V to 5.5V input Voltage range makes
the AME5259A ideally suited for single Li-Ion battery-
powered applications. 100% duty cycle provides low
dropout operation, extending battery life in portable sys-
tems. PWM pulse skipping mode operation provides
very low output ripple voltage for noise sensitive applica-
tions. At very light load, the AME5259A will automati-
cally skip pulses in pulse skip mode operation to main-
tain output regulation.
The internal synchronous switch increases efficiency
and eliminates the need for an external Schottky diode.
Low output voltages are easily supported with the 0.6V
feedback reference voltage. The AME5259Ais available
in small DFN-6D, QFN-16C and SOT-25 packages.
Other features include soft start, lower internal refer-
ence voltage with 2% accuracy, over temperature protec-
tion, and over current protection.
n
General Description
n
Features
n
Applications
n
Typical Application
l
Cellular Telephones
l
Personal Information Applicances
l
Wireless and DSL Modems
l
MP3 Players
l
Portable Instruments
l
High Efficiency: Up to 95%
l
Shutdown Mode Draws < 1
µA Supply Current
l
2.5V to 5.5V Input Range
l
Adjustable Output From 0.6V to V
IN
l
1.0V, 1.2V. 1.5V, 1.6V, 1.8V, 2.5V and 3.3V
Fixed/Adjustable Output Voltage
l
1.2A Output Current
l
Low dropout Operation: 100% Duty Cycle
l
No Schottky Diode Required
l
1.5MHz Constant Frequency PWM Operation
l
Green Product Meet RoHS Standard
2.2
µH
COUT
10
µF
CER
VIN
VOUT
Figure 1. Fixed Output Voltage
High Efficiency Step -Down Conventer
AME5259 A
IN
SW
OUT
EN
GND
2.2
µH
CIN
4.7
µF
CER
COUT
10
µF
CER
VIN
1.8V
VOUT=VFB (R1+R2)/R2
R1
150K
VIN = 2.5V to 5.5V
VOUT
AME5259 A
IN
SW
FB
EN
GND
R2
75K
Figure 2. Adjustable Output Voltage
1.8V at 1000mA Step-Down Requlator
CFWD: 22pF~220pF
CIN
4.7
µF
CER
CFWD


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