EV0055 (MP1530) TRIPLE OUTPUT STEP-UP PLUS CHARGE PUMP FOR TFT BIAS

EVALUATION BOARD

NOTICE:

The information in this document is subject to change without notice. Please contact MPS for current specifications.

Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS

products into any application. MPS will not assume any legal responsibility for any said applications.

EV0055 Rev. 1.3

www.MonolithicPower.com

5

8/22/2005

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2005 MPS. All Rights Reserved.

TM

QUICK START GUIDE

The three output voltages of this board are set to +13V, +27V, and –8.5V. The board layout

accommodates most commonly used inductors and output capacitors.

1. Attach the positive end of loads to the VMAIN, VGH and GND (for the negative output) pins,

respectively. Attach negative ends of the loads to GND and VGL (for the negative output) pins.

2. Attach an input voltage 2.7V

respectively.

disable the MP1530 connect the EN pin to ground.

pulled LOW if all regulators exceed 80% of their specified voltages. After all regulators are

fault persists for more than approximately 6ms (for CT=10nF), the entire chip will shut down.

5. To adjust the output voltages:

Use a 10kΩ to 50kΩ for the low-side resistor of each voltage divider (i.e. R7, R9 and R5).

For the step-up converter, determine the high-side resistor R6 using the equation:

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

−

=

7

R

V

V

V

6

R

1

FB

1

FB

MAIN

For the positive charge-pump, determine the high-side resistor R8 by the equation:

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

−

=

9

R

V

V

V

8

R

3

FB

3

FB

GH

D

MAIN

MAIN

DROPOUT

GH

POS

V

2

V

V

V

V

N

−

−

+

=

For the negative charge-pump, determine the high-side resistor R4 by the equation:

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

−

=

5

R

V

V

4

R

REF

GL

D

MAIN

DROPOUT

GL

NEG

V

2

V

V

V

N

−

+

−

=