Datasheet MP1542 (Monolithic Power Systems) - 10

MP1542 – 700KHz/1.3MHz BOOST CONVERTER WITH A 2A SWITCH AMLCD Application
noise. All components must be placed as close to Figure 3 shows a power supply for active matrix the IC as possible. Keep the path between the (TFT-LCD) flat-panel displays. The positive and SW pin, output diode, output capacitor and GND negative charge pump outputs are configured pin extremely short for minimal noise and ringing. with discrete components. Adjust the output The input capacitor must be placed close to the capacitance and compensation component IN pin for best decoupling. All feedback values as necessary to meet transient components must be kept close to the FB pin to performance. prevent noise injection on the FB pin trace. The
Layout Consideration
ground return of the input and output capacitors High frequency switching regulators require very should be tied close to the GND pin. See the careful layout for stable operation and low MP1542 demo board layout for reference.
TYPICAL APPLICATION
D1 VIN VOUT 5V 12V 6 5 7
IN SW
2
FSEL FB
3 OFF ON
EN MP1542
8 1
SS COMP GND
4 C3 2.2nF C4 10nF
Figure 2—Typical Application Circuit
VOUT3 26V 5mA D2 VOUT2 D3 D4 -9V 10mA D1 VIN VOUT1 3.0V to 3.6V 9V 6 5 150mA 7
IN SW
2
FSEL FB
3 OFF ON
EN MP1542
8 1
SS COMP GND
4 C3 2.2nF C4 22nF
Figure 3—Multiple-Output, Low-Profile (1.2mm max) TFT LCD Power Supply
MP1542 Rev. 1.5 www.MonolithicPower.com
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6/22/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved.