MAX782CSLASHD datasheet(25/32 Pages) MAXIM

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Triple-Output Power-Supply

Controller for Notebook Computers

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________Evaluation Kit Information

The MAX782 evaluation kit (EV kit) is an assembled,

surface-mount demonstration board. The kit embodies

the standard application circuit and uses dip switches

to control the 3V, 5V, and VPP outputs. The board

accepts battery input voltages between 6.5V and 30V,

and provides up to 30W of output power. All functions

are controlled by standard CMOS/TTL logic levels.

___________Ev Kit Quick Reference

To set up the EV kit, use the following procedure:

1. Connect a power supply to the BATT IN terminals.

The supply voltage should be between 6.5V and 30V.

Input current may be several amps, depending on the

input voltage and the output power demanded.

2. Turn on the +5V output by setting the ON5 dip

switch to ON.

The 5V OUT edge pad now supplies

+5V at up to 3A, and +15V is now available at the

+15V OUT edge pad.

3. Turn on the +3.3V output by setting the ON3 dip

switch to ON.

The 3.3V OUT edge pad now sup-

plies +3.3V at up to 3A. The two regulators may be

operated independently.

4. To use the VPPA/VPPB programmable voltage out-

puts, ON5 must be enabled. Set the four-circuit dip

switch to the desired code and measure the output at

the VPPA and VPPB edge pads. DA0 and DA1 con-

trol VPPA’s state; DB0 and DB1 control VPPB’s state.

_______Ev Kit Detailed Description

Battery Input

BATT IN – Battery input, 6.5V to 30V

GND – Ground

The battery input voltage should be between 6.5V and

30V. The input voltage upper limit is set by the voltage

rating of the input bypass capacitors, C1 and C13, and

may not exceed the MAX782’s 30V maximum rating.

Higher input voltages generally require physically larg-

er input capacitors.

Low-Battery Detection Comparators

To demonstrate the level shifters / high-side drivers,

ON5 must be enabled so the +15V (VDD) is available

to pull up the Q1-Q3 outputs. Measure the high-side

driver supply at the VH edge pad. Logic-level edge

pads D1-D3 control the outputs Q1-Q3. Q1-Q3 pull up

to VH whenever the corresponding input D1-D3 is at a

logic-high level.

When active, outputs Q1-Q3 pull up to VH. Resistor

R16, located on the back of the board, pulls the high-

side driver voltage VH up to +15V. By removing R16

and installing a resistor at the empty R15 site, VH may

be tied to the +3.3V output. Alternately, both R15 and

R16 may be omitted and the user may supply an arbi-

trary voltage between 3V and 20V at the VH edge pad.

Note that Q1-Q3 are not meant to drive high-current

loads directly.

The D1-D3 comparators can be used as precision volt-

age detectors by installing resistor dividers at each

input (R11/R12, R10/R13, R9/R14).

Power-Supply Controls

ON3 – Enable 3.3V power supply

ON5 – Enable 5.0V power supply

SYNC – Switch-mode power-supply frequency input

(optional)

VPP Voltage Outputs

The PCMCIA-compatible programmable voltage out-

puts are controlled by the DA0, DA1, DB0, and DB1

logic-level inputs.

The MAX782 provides industry-

standard Intel 82365-comptaible VPPA/VPPB PCMCIA

controls (see

Pin Description). The four-circuit dip

switch connects the same way as the edge pads.

From left to right, switch 1 controls DA1, switch 2 con-

trols DA0, switch 3 controls DB1, and switch 4 controls

DB0. VPPA and VPPB are capable of supplying 60mA

each.

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