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MAX17103EVKIT

MAX17103 Evaluation Kit

Maxim Integrated 

MAX17103 Evaluation Kit

Quick Start

Recommended Equipment

• 2.3V to 5.5V, 2A DC power supply

• Voltmeters

Procedure

The MAX17103 EV kit is fully assembled and tested.

Follow the steps below to verify board operation.

Caution: Do not turn on the power supply until all

connections are completed.

1) Verify that a shunt is installed across pins 1-2 of

jumper JU1.

2) Verify that SW1 4-position DIP switches are in the

on position.

3) Connect the positive terminal of the power supply

to the VIN pad. Connect the negative terminal of

the power supply to the PGND pad. Set VIN to +3V.

4) Turn on the power supply and verify that the step-

up switching regulator output (VMAIN) is +8.5V.

5) Verify that the gate-on supply (GHON) is approxi-

mately +23V.

6) Verify that the gate-off supply (VGL) is approxi-

mately -6V.

7) Verify that the output of the high-speed op amp

(VOUT) is approximately +4.25V.

8) Verify that the outputs of the high-voltage level-

shifting buffers are approximately +23V (= GHON).

Detailed Description of Hardware

The MAX17103 EV kit contains a step-up switching reg-

ulator, a positive two-stage charge pump, a negative

single-stage charge pump with a negative linear regu-

lator controller, a high-speed op amp, and three high-

voltage level-shifting buffers for scan-driver applica-

tions. The EV kit operates from a DC power supply

between +2.3V and +5.5V.

As configured, the step-up switching regulator (VMAIN)

generates a +8.5V output and provides at least 250mA

from a +2.7V input. The step-up switching-regulator

output voltage can be adjusted up to +15V with differ-

ent feedback resistors (see the Output-Voltage

Selection section).

The GHON consists of two positive charge-pump

stages to generate approximately +23V and provides

up to 20mA. The VGL consists of a single negative

charge-pump stage regulated with the negative linear

controller to generate approximately -6V and provides

up to 20mA. Loading GHON and VGL reduces the

available VMAIN current proportionally.

The op-amp output (VOUT) is set to +4.25V and sources

or sinks current up to 200mA (typ). The output can be

reconfigured to other voltages with voltage-divider resis-

tors (see the Output-Voltage Selection section).

The three logic-level to high-voltage level and shifting

buffers can buffer three logic inputs (CK, XCK, and ST)

and shift them to the desired output levels (CKH,

XCKH, and STH) to drive TFT-LCD row logic. The driver

outputs swing between their power-supply rails (GHON

and VGL) according to the input logic levels on the

block’s inputs (CK, XCK, CS, and ST), and by internal

logic used during power-up and power-down. For fur-

ther details, refer to the High-Voltage Level-Shifting

Scan Driver section in the MAX17103 IC data sheet.

The four switches within SW1 are used to select logic

levels on CK, CS, XCK, and ST for testing purposes.

Set each switch open when driving CK, CS, XCK, and

ST with external logic.

Jumper Selection (JU1)

The MAX17103 EV kit incorporates jumper JU1 to con-

trol the chip enable control. See Table 1 for jumper JU1

functions.

Output-Voltage Selection

Step-Up Switching-Regulator

Output Voltage (VMAIN)

The MAX17103 EV kit’s step-up switching-regulator out-

put (VMAIN) is set to +8.5V by feedback resistors R1

and R2. To generate output voltages other than +8.5V

(up to +15V), select different external voltage-divider

resistors R1 and R2. For instructions on selecting the

step-up switching regulator feedback divider resistors

for other output voltages, refer to the Output-Voltage

Selection section in the MAX17103 IC data sheet.

Table 1. Jumper JU1 Functions

SHUNT

POSITION

ENA PIN

EV KIT

OUTPUTS

1-2*

ENA connected to LDOO Outputs enabled

through R8

(VMAIN = +8.5V)

2-3

ENA connected to GND Outputs disabled

through R8

(VMAIN ~ VIN)

*Default position.

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