|
|
PDF AME5258 Data sheet ( Hoja de datos )
| Número de pieza | AME5258 | |
| Descripción | 600mA Synchronous Buck Converter | |
| Fabricantes | AME | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de AME5258 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
|
No Preview Available !
www.datasheet4u.com
AME
AME5258
1.5MHz, 600mA
Synchronous Buck Converter
n General Description
The AME5258 is a high efficiency monolithic synchro-
nous buck regulator using a constant frequency, current
mode architecture. The device is available in an adjustable
version and fixed output voltages of 1.2V, 1.8V, 2.5V and
3.3V. Supply current with no load is 300µA and drops to
<1µA in shutdown. The 2.5V to 5.5V input voltage range
makes the AME5258 ideally suited for single Li-Ion bat-
tery-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 applications.
At very light load, the AME5258 will automatically skip
pulses in pulse skip mode operation to maintain output
regulation.
The AME5258 is simple to use. As with standard
LDO's,Input and output capacitor are required. The only
other element is a small, low cost, 2.2µH inductor.Low
output voltages are easily supported with the 0.6V feed-
back reference voltage. And 100% duty cycle when Vin
approaches Vout.
n Features
l High Efficiency: Up to 96%
l 600mA Output Current at VIN=3V
l 2.5V to 5.5V Input Voltage Range
l 1.5MHz Constant Frequency Operation
l No Schottky Diode Required
l Low Dropout Operation: 100% Duty Cycle
l 0.6V Reference Allows Low Output
Voltages
l Shutdown Mode Draws<1µA Supply
Current
l Current Mode Operation for Excellent
Line and Load Transient Response
l Overtemperature Protection
l Internal Soft Start
l Space Saving 5-Pin SOT-25 Package
l Meet RoHS Standards
n Applications
l Cellular Phones
l Digital Cameras
l Portable Electronics
l USB Devices
l MP3 Players
l LDO Replacement
n Typical Application
VIN
CIN
4.7µF
CER
Fixed Output Voltage
2.2µH
IN SW
AME5258
EN OUT
GND
VOUT
COUT
10µF
CER
Figure 1: High Efficiency Step-Down Conventer
Adjustable Output Voltage
VIN = 2.5V to 5.5V
VIN IN
2.2µH
SW
CIN
4.7µF
CER
AME5258
22pF
EN FB
GND
VOUT
1.8V
600mA
R1
887K COUT
10µF
CER
R2
442K
VOUT=VFB (R1+R2)/R2
Figure 2: 1.8V at 600mA Step-Down Requlator
Rev.A.05
1
1 page  
www.datasheet4u.com
AME
AME5258
1.5MHz, 600mA
Synchronous Buck Converter
n Available Options
Part Number
AME5258-BEVADJ
Marking*
BWMMXX
Output Voltage Package
ADJ SOT-25
Operating Ambient
Temperature Range
-40OC to +85OC
AME5258-AEV120
BYRMXX
1.2V
SOT-25
-40OC to +85OC
AME5258-AEV180
BYJMXX
1.8V
SOT-25
-40OC to +85OC
AME5258-AEV250
BYNMXX
2.5V
SOT-25
-40OC to +85OC
AME5258-AEV330
BYFMXX
3.3V
SOT-25
-40OC to +85OC
Note:
1. The first 3 places represent product code. It is assigned by AME such as BWM.
2. A bar on top of first letter represents Green Part such as BWM.
3. The last 3 places MXX represent Marking Code. It contains M as date code in "month", XX as LN code and
that is for AME internal use only. Please refer to date code rule section for detail information.
4. Please consult AME sales office or authorized Rep./Distributor for the availability of output voltage and package
type.
n Absolute Maximum Ratings
Parameter
Input Supply Voltage
EN, FB Voltages
SW Voltage
P-Channel Switch Source Current (DC)
N-Channel Switch Sink Current (DC)
ESD Classification
Symbol
VIN
VEN ,VF B
VSW
ISW
ISW
Maximum
6
VIN
-0.3 to (VIN+0.3)
900
900
C*
Unit
V
V
V
mA
mA
Caution: Stress above the listed in absolute maximum ratings may cause permanent damage to the device.
* HBM C: 4000V ~ 6000V
Rev.A.05
5
5 Page 
www.datasheet4u.com
AME
AME5258
VIN
3.3V to 5.5V
IN
SW
COUT
4.7µF
CER
AME5258
EN FB
GND
2.2µH
22pF
960K
240K
VOUT
3V
COUT
10µF
CER
1.5MHz, 600mA
Synchronous Buck Converter
VIN
3.6V to 5.5V
IN
SW
COUT
4.7µF
CER
AME5258
EN FB
GND
2.2µH
22pF
887K
196K
VOUT
3.3V
COUT
10µ F
CER
Figure 8: 3V Step-Down Regulator
Figure 9: 3.3V Step-Down Regulator
PC Board Layout Checklist
When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the
AME5258. These items are also illustrated graphically in Figures 10 and Figures 11 . Check the following in your layout:
1. The power traces, consisting of the GND trace, the SW trace and the VIN trace should be kept short, direct and wide.
2. Does the VFB pin connect directly to the feedback resistors? The resistive divider R1/R2 must be connected between
the (+) plate of COUT and ground.
3. Does the (+) plate of CIN connect to VIN as closely as possible? This capacitor provides the AC current to the internal
power MOSFETs.
4. Keep the switching node, SW, away from the sensitive VFB node.
5. Keep the (-) plates of CIN and COUT as close as possible.
VIN
IN
SW
AME5258
EN FB
+
CIN
GND
-
L1
CFWD
R2
R1
VOUT
+
COUT
-
VIN
IN
SW
AME5258
EN VOUT
+
CIN
GND
-
L1
VOUT
+
COUT
-
Figure 10: AME5258 Adjustable Voltage
Regulator Layout Diagram
Rev.A.05
Figure 11: AME5258 Fixed Voltage
Regulator Layout Diagram
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AME5258.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AME5258 | 600mA Synchronous Buck Converter | AME |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |