MAX25530 datasheet(4/16 Pages) MAXIM

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Evaluates: MAX25530

MAX25530 Evaluation Kit

Detailed Description of Hardware

(or Software)

The EV kit consists of two sections with separate power

supply inputs.

The TFT Power Section operates from a DC supply volt-

age of 2.8V up to 5.5V.

The HB LED Driver Section operates from a DC supply

voltage of 4.5V up to the HB LED forward-string voltage

and can handle load-dump conditions up to 52V.

TFT Power Section

The EV kit TFT power section feature two source-driver

power supplies (VPOS and VNEG accessible through

the POS and NEG PCB pads on the EV kit) and the

two gate-driver power supplies (DGVDD and DGVEE

accessible through the DGVDD and DGVEE PCB pads

on the EV kit).

The source-driver power supplies consist of a syn-

chronous boost converter and an inverting buck-boost

converter that switch at 2.2MHz (or 430kHz) and can

generate voltages up to +18V and down to -7V. The

positive source driver can deliver up to 120mA, while the

negative source driver is capable of 100mA.

The gate-driver power supplies consist of regulated

charge pumps that generate up to +28V and down to

-21.5V and can deliver up to 10mA each.

Select the value of the boost inductor using Table 1:

Figure 1. MAX25530 Evaluation Kit Software (GUI)

Table 1. Boost Converter Inductor

Selection

*Default value.

fSW

VPOS < 10V

VPOS > 10V

430kHz

4.7μH

10μH

2.2MHz

1μH*

2.2μH

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