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AME5258 Datasheet(PDF) 1 Page - AMETHERM Circuit Protection Thermistors

No. de pieza AME5258
Descripción Electrónicos  1.5MHz, 600mA Synchronous Buck Converter
Download  17 Pages
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Fabricante Electrónico  AMETHERM [AMETHERM Circuit Protection Thermistors]
Página de inicio  http://www.ametherm.com
Logo AMETHERM - AMETHERM Circuit Protection Thermistors

AME5258 Datasheet(HTML) 1 Page - AMETHERM Circuit Protection Thermistors

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AME
1
AME5258
1.5MHz, 600mA
Synchronous Buck Converter
Rev.A.05
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 300
µA and drops to
<1
µA 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, 2.2
µH inductor.Low
output voltages are easily supported with the 0.6V feed-
back reference voltage. And 100% duty cycle when Vin
approaches Vout.
n General Description
n Typical Application
Figure 1: High Efficiency Step-Down Conventer
n Features
l High Efficiency: Up to 96%
l 600mA Output Current at V
IN=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<1
µA 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
Figure 2: 1.8V at 600mA Step-Down Requlator
Fixed Output Voltage
2.2
µH
CIN
4.7
µF
CER
AME5258
IN
SW
OUT
EN
GND
COUT
10
µF
CER
VIN
VOUT
Adjustable Output Voltage
2.2
µH
CIN
4.7
µF
CER
AME5258
IN
SW
FB
EN
GND
COUT
10
µF
CER
VIN
1.8V
600mA
VOUT=VFB (R1+R2)/R2
22pF
R1
R2
VIN = 2.5V to 5.5V
887K
442K
VOUT


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