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AME5150 Evaluation Board User Guide
1. General Descriptions
The AME5150 is a fixed off time inverting DC/DC converter with integrated N-channel Power MOS. It's
ideal for LCD panels requiring high efficiency with light load condition as well as LED application for
cellular phone back-lighting, PDAs and other hand-held devices.
2. Features
● Input voltage: 1.5V to 5.5V
● Duty ratio: Fixed 400ns T
● Current Limit and Enable Function
● Input Under Voltage Lockout
3. Applications
● Electronic Information Organizers
● Cellular and Portable Phones
● Various Multi-function Power Supplies
4. Evaluation Board Schematic
(4.1) AME5150 Typical Schematic
Vin
C1
C9
J1
IN
EN
GND
PFM Control
OFF
C2
L1
1
SW
5
IN
U1
AME5150
4
EN
NFB
GND
2
R1
Figure 1
● Output voltage: Up to -28V
● Oscillation frequency: Various Base on I/O Spec
● Thermal Shutdown Function
● Small SOT-25 Package
● Palmtops
● Portable Audio Systems
D1
R2
C4
D2
D3
C3
R7
D5
C6
3
1/5
+Vout
C5
ZD2
R8
-Vout
R6
ZD1
R4
C7
C8
R5
Rev. A /01-2010
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Summary of Contents for AME AME5150
- Page 1 AME5150 Evaluation Board User Guide 1. General Descriptions The AME5150 is a fixed off time inverting DC/DC converter with integrated N-channel Power MOS. It’s ideal for LCD panels requiring high efficiency with light load condition as well as LED application for cellular phone back-lighting, PDAs and other hand-held devices.
- Page 2 (4.2) AME5150 Typical Schematic for -25V Application Figure 2 5. Bill of Materials BOM for Item (4.2) Component Q’ty Value Description Part No. Manufacturer Package 4.7uF/ 6.3V Ceramic Capacitor 1206B475K6R3C WALSIN 1206 0.47uF/25V Ceramic Capacitor 0805B474K250C WALSIN 0805 15pF/ 50V...
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Page 3: Application Information
(6.2) Connect -Vout to the positive point of E-load and GND to supply ground or parallel an appropriate resistor to pull up the loading. (6.3) Importing a logic signal to EN pin will enable the AME5150. Logic high (V >1.5V) switches on AME5150, logic low puts it into low current shutdown mode. - Page 4 (7.4) Board Layout Considerations High frequency switching regulators require very careful layout of key components in order to get stable operation and low noise. A good PCB layout could make AME5150 working perfect to achieve the best performance. (7.5) PCB Layout Example The PCB layout example is for standard Inverting converter application with AME5150 device.
- Page 5 For this design, choice RB520S-30, with 30V reverse voltage, 0.2A forward current, and around 0.4V forward voltage drop. The freewheeling diode should be place close to the SW pin of the AME5150 to minimize noise coupling due to trace inductance.
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