MP1542 MPS, MP1542 Datasheet - Page 9

• Manufacturer Part Number: MP1542
• Description: Monolithic Power Systems
• Manufacturer: MPS

AMLCD Application
Figure 3 shows a power supply for active matrix
(TFT-LCD) flat-panel displays. The positive and
negative charge pump outputs are configured
with discrete components. Adjust the output
capacitance and compensation component
values
performance.
Layout Consideration
High frequency switching regulators require very
careful layout for stable operation and low
TYPICAL APPLICATION
01/05, Rev. 1.0
as
Figure 3—Multiple-Output, Low-Profile (1.2mm max) TFT LCD Power Supply
3.0V to 3.6V
necessary
OFF ON
V
IN
OFF ON
V
5V
to
IN
MPS Proprietary Information. © 2005 All Rights Reserved.
MP1542 – 700KHz/1.3MHz BOOST CONVERTER WITH A 2A SWITCH
meet
Figure 2—Typical Application Circuit
Unauthorized Photocopy and Duplication Prohibited.
C4
22nF
FSEL
EN
SS
IN
transient
MP1542
C4
10nF
GND
FSEL
EN
SS
SW
IN
COMP
MP1542
2.2nF
FB
GND
C3
D1
SW
COMP
2.2nF
FB
C3
noise. All components must be placed as close to
the IC as possible. Keep the path between the
SW pin, output diode, output capacitor and GND
pin extremely short for minimal noise and ringing.
The input capacitor must be placed close to the
IN pin for best decoupling. All feedback
components must be kept close to the FB pin to
prevent noise injection on the FB pin trace. The
ground return of the input and output capacitors
should be tied close to the GND pin. See the
MP1542 demo board layout for reference.
D1
D3
D4
D2
V
12V
MP1542_F02
OUT
INITIAL RELEASE
V
9V
150mA
V
26V
5mA
V
-9V
10mA
MP1542_F03
OUT1
OUT3
OUT2
9