MAX6765EVKIT+ Datasheet MAX6765EVKIT+ | P1-P3

General Description

The MAX6765 evaluation kit (EV kit) provides a proven

printed-circuit board (PCB) layout that facilitates evalu-

ation of the MAX6765 low-quiescent-current, high-volt-

age linear regulator. This EV kit is a fully assembled

and tested surface-mount board.

With a few simple changes detailed in a later section,

this EV kit can also evaluate the MAX6766–MAX6774.

The MAX6765 EV kit includes connections to the regu-

lator, the enable signal, the watchdog timer, and the

microprocessor (µP) reset line. An LED indicates the

status of the voltage regulator and jumpers provide

control over all major features of the MAX6765. The

MAX6765 EV kit withstands temperatures ranging from

-40°C to +105°C and the MAX6765 IC withstands tem-

peratures ranging from -40°C to +125°C.

The EV kit comes with the MAX6765TTLD2+ installed. To

evaluate the pin-compatible MAX6766 or the MAX6767–

MAX6774, contact the factory for free samples.

Features

♦ Wide Supply Voltage Range: 4V to 72V

♦ 100mA Regulator Output Current

♦ Can Also Evaluate MAX6766–MAX6774

Evaluates: MAX6765–MAX6774

MAX6765 Evaluation Kit

________________________________________________________________

Maxim Integrated Products

19-0979; Rev 0; 9/07

Component List

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Component Suppliers

Note: Indicate that you are using the MAX6765–MAX6774 when contacting these component suppliers.

DESIGNATION

QTY

DESCRIPTION

C1, C5 0 Not installed, capacitors

C2 1

1µF ±20%, 100V X7R ceramic

capacitor

TDK C3225X7R2A105M

AVX 1210C105KAT9A

C3 1

10µF ±20%, 10V X7R ceramic

capacitor

TDK C3225X7R1C106M

C4 1

0.022µF ±10%, 16V X7R ceramic

capacitor (0603)

TDK C1608X7R1H223K

LED1 1 Green LED (1206)

DESIGNATION

QTY

DESCRIPTION

J1, J4, J6 3 2-pin headers

J2, J3, J5 0 Not installed, headers

R1, R7 2 100kΩ ±1% resistors (0805)

R2, R3, R5, R6

0 Not installed, resistors (0805)

R4 1 150Ω ±1% resistor (0805)

U1 1

MAX6765TTLD2+ (6-pin TDFN-EP) or

MAX6766 (optional)

U1a 0

Not installed (optional),

M AX6767–M AX6774 ( 8-p i n TD FN- E P )

—3

Shunts, 2-position

(see Table 1 for jumper functions)

— 1 PCB: MAX6765 Evaluation Kit+

SUPPLIER PHONE FAX WEBSITE

AVX Corp. 602-678-0384 602-678-0385 www.avx.com

TDK Corp. 847-390-4373 847-390-4428 www.component.tdk.com

Ordering Information

Denotes lead-free and RoHS-compliant.

PART TYPE

MAX6765EVKIT+ EV Kit

Evaluates: MAX6765–MAX6774

Quick Start

Recommended Equipment

Before beginning, the following equipment is needed:

• An adjustable output power supply capable of sup-

plying at least 12V at 100mA

Procedure

The MAX6765 EV kit is fully assembled and tested.

Follow the steps below to verify board operation:

1) Ensure that jumpers J1, J4, and J6 are shorted.

2) Connect the power supply to the IN and GND

connections.

3) Set the power supply output to 12V and observe LED1.

Detailed Description

The MAX6765 operates from 4V to 72V and provides a

fixed or adjustable regulator output. The regulator can

source 100mA, subject to thermal dissipation limits.

Table 1 lists the function of each jumper on the EV kit.

Voltage Regulator Output

OUT provides a regulated voltage at 5V.

Reset Timeout

The reset output remains asserted for a certain minimum

period, which is controlled by jumper J6. If J6 is shorted,

the reset period is the default of 12.5ms. If J6 is open,

capacitor C4 sets the timeout period to 26.8ms, but this

can easily be changed using the following equation:

where t

is in seconds and C4 is in farads. Refer to the

MAX6765-MAX6774 IC data sheet for more information

on capacitor selection.

tC x

⎛

⎝

⎜

⎞

⎠

⎟

122 10.

MAX6765 Evaluation Kit

2 _______________________________________________________________________________________

JUMPER POSITION FUNCTION

Open Regulator disabled

Closed* Regulator enabled

Open Hold mode disabled

J2 (MAX6767/

MAX6768 only)

Closed Hold mode enabled

Open ENABLE2 low

J3 (MAX6771/

MAX6772 only)

Closed ENABLE2 high

Open LED1 disabled

Closed* LED1 enabled

1-2

Regulator voltage set by

R5 and R6

J5 (MAX6767–

MAX6774 only)

2-3 Regulator voltage fixed

Open

Reset timeout set by C4

to 26.8ms

Closed* Reset timeout fixed at 12.5ms

Table 1. Jumper Functions (J1–J6)

Default position.

Evaluates: MAX6765–MAX6774

MAX6765 Evaluation Kit

_______________________________________________________________________________________ 3

PARTS CHANGED

PARTS DESCRIPTION

R2 R3 J2 J3 J5, R5, R6

MAX6765/MAX6766 Unmodified EV kit Open

MAX6767/MAX6768 Pin 4 is the

HOLD input Open

Add jumper to

control HOLD

Open

MAX6769/MAX6770

Pin 4 is the

RESETIN comparator

Add resistive divider to set

the comparator threshold

Open

MAX6771/MAX6772

Pin 4 is the second

enable

Open

Add jumper

to second

enable

MAX6773/MAX6774

Pin 4 is the watchdog

timer input

Add 100kΩ

pulldown

resistor

Open

See Adjustable

Output section

Table 2. EV Kit Modifications

Evaluating the

MAX6766–MAX6774

This EV kit can also be used to evaluate the MAX6766–

MAX6774. The MAX6766 uses the 6-pin TDFN footprint

(U1) on the EV kit and the MAX6767–MAX6774 use the

8-pin TDFN footprint (U1a). Each of these parts shares

the same pin connections except for pin 4. R2, R3, J2,

and J3 work differently depending on the part. See Table

2 for the modifications needed for a particular part.

RESETIN Comparator

The MAX6769/MAX6770 have a RESETIN comparator

that asserts RESET if the voltage falls below the com-

parator threshold. The threshold voltage on IN can be

set using the following formula:

where V

is either 1.085V (M/S/Y/V suffixes) or 1.147V

(L/T/Z/W suffixes) and R3 and R2 are ≤ 200kΩ. Do not

exceed the 12V absolute maximum rating for RESETIN.

Adjustable Output

With the MAX6767–MAX6774, OUT provides regulated

DC at a voltage set by jumper J5, which selects either

the fixed output voltage or the output voltage set by

resistive dividers R5 and R6. This can easily be

changed according to the following equation:

where V

SET

= 1.233V and R5 and R6 are ≤ 200kΩ.

OUT SET

⎛

⎝

⎜

⎞

⎠

⎟

IN TH TH_

⎛

⎝

⎜

⎞

⎠

⎟

P1-P3 P4-P5

MAX6765EVKIT+

Mfr. #:

Buy MAX6765EVKIT+

Manufacturer:

Maxim Integrated

Description:

Power Management IC Development Tools MAX6765 Eval Kit

Lifecycle:

New from this manufacturer.

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MAX6765EVKIT+