AME
AME5268
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General Description
The AME5268 is a fixed frequency monolithic synchro-
nous buck regulator that accepts input voltage from 4.75V
to 28V. Two NMOS switches with low on-resistance are
integrated on the die. Current mode topology is used for
fast transient response and good loop stability.
Shutdown mode reduces the input supply current to less
than 1µA. An adjustable soft-start prevents inrush current
at turn-on.
This device is available in SOP-8/PP package with ex-
posed pad for low thermal resistance.
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
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Features
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3A Output Current
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Wide 4.75V to 28V Operating Input Range
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Integrated Power MOSFET Switches
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Output Adjustable from 0.925V to 25V
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Up to 95% Efficiency
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Programmable Soft Start
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Stable with Low ESR Ceramic Output
Capacitors
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Cycle-by Cycle Over Current Protection
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Fixed 340KHz Frequency
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Input Under Voltage Lockout
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System Protected by Over-current Limiting,
Over-voltage Protection and Thermal Shut-
down
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Thermally Enhanced SOP-8/PP Package
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All AME’ s Lead Free Products Meet RoHS
Standards
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Applications
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Distributed Power System
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Networking System
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FPGA, DSP, ASIC Power Supplies
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Notebook Computers
C
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Typical Application
V
IN
12V
C1
10µF/35V
x2
R4
100KΩ
IN
EN
BS
SW
ie
C5
10nF
V
OUT
5V
3A
L1
15µH/3.4A
AME5268
SS
GND
FB
COMP
S
C4
0.1µF
C3
3.3nF
R3
6.98KΩ1%
R1
44.2K
Ω1%
R2
10KΩ1%
C2
22µF/10V
x2
Rev.B.01
1
AME [ ANALOG MICROELECTRONICS ]
