MAX1522EVKIT Datasheet MAX1522EVKIT | P1-P3

General Description

The MAX1522 evaluation kit (EV kit) is a fully assembled

and tested surface-mount circuit board that contains

two separate step-up switching controller circuits. The

first circuit (left side) utilizes the MAX1524, is config-

ured for +5V output, and can deliver up to 1A of cur-

rent. The MAX1524 supply pin is bootstrapped to the

output. The second circuit (right side) utilizes the

MAX1522, is configured for +12V output, and can deliv-

er up to 200mA of current with the input voltage as low

as +2.7V.

The MAX1522 and MAX1524 feature soft-start and fault-

detect. The EV kit allows the user to set the on-time of

the N-channel MOSFETs to either 0.5µs or 3µs.

Features

♦ Input Voltage

+1.5V to +5.5V (Left Side, BOOTSTRAPPED)

+2.5V to +5.5V (Right Side, NON-

BOOTSTRAPPED)

♦ Output Voltage

+5V Output Up to 1A (Left Side)

+12V Output Up to 200mA (Right Side)

♦ No Current-Sense Resistor

♦ Fault-Detection

♦ Soft-Start Limits Inrush Current

♦ Selectable Maximum Duty Cycle (45% or 80%)

♦ Adjustable Output Voltages

♦ 1µA (max) Shutdown Current

♦ Switching Frequency Up to 1MHz

♦ Fully Assembled and Tested

Evaluates: MAX1522/MAX1523/MAX1524

MAX1522 Evaluation Kit

________________________________________________________________ Maxim Integrated Products 1

19-1974; Rev 0; 03/01

Ordering Information

Note: Please indicate that you are using the MAX1522,

MAX1523, or MAX1524 when contacting these component

suppliers.

Component Suppliers

SUPPLIER PHONE FAX

Fairchild 408-822-2000 408-822-2102

Murata 814-237-1431 814-238-0490

Nihon USA 661-867-2555 661-867-2698

Sanyo 619-661-6835 619-661-1055

Sumida 847-956-0666 847-956-0702

Taiyo Yuden 408-573-4150 408-573-4159

TDK 847-803-6100 847-803-6296

Toshiba 949-455-2000 949-859-3963

DESIGNATION QTY DESCRIPTION

C1, C2 2

100pF, 50V COG ceramic

capacitors (0603)

TDK C1608COG1H101JT or

Murata GRM39COG101J050AD

C3 1

47pF, 50V COG ceramic

capacitor (0603)

TDK C1608COG1H470JT

C4 1

330pF, 50V COG ceramic

capacitor (0603)

TDK C1608X7R1H331KT or

Murata GRM39COG331J050AD

C5 1

1µF, 16V X7R ceramic capacitor

(1206)

Taiyo Yuden EMK316BJ105KF or

TDK C3216X7R1C105KT

Component List

DESIGNATION QTY DESCRIPTION

C6, C7 2

10µF, 6.3V X5R ceramic

capacitors (1206)

TDK C3216X5R0J106KT or

Taiyo Yuden JMK316BJ106KL

C8 1

47µF ±20%, 20V aluminum

electrolytic capacitor

Sanyo 25CV47AX

C9 1

33µF, 10V Poscap capacitor (C)

Sanyo 10TPA33M

R1 1 301kΩ ±1% resistor (0805)

R2, R4 2 100kΩ ±1% resistors (0805)

R3 1 866kΩ ±1% resistor (0805)

R5 1 10Ω ±5% resistor (0805)

N1, N2 2

30V, 5.2A N-channel MOSFET

Fairchild FDC633N (6-pin

SuperSOT)

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART TEMP. RANGE IC PACKAGE

MAX1522EVKIT 0°C to +70°C 6 SOT23

Evaluates: MAX1522/MAX1523/MAX1524

MAX1522 Evaluation Kit

2 _______________________________________________________________________________________

Quick Start

The MAX1522 EV kit is fully assembled and tested.

Follow these steps to verify board operation. Do not

turn on the power supply until all connections are

completed.

+5.0V Output Circuit

(BOOTSTRAPPED)

1) Verify that shunts are across pins 2 and 3 of jumper

JU1 (SET, 0.5µs) and pins 1 and 2 of jumper JU2

(SHDN).

2) Connect a +2.5V to +5.5V DC power supply to the

VIN1 pad. Connect the supply ground to the GND1

pad.

3) Turn on the power supply.

4) With a voltmeter, verify that the output voltage

VOUT1 is +5.0V.

For instructions on selecting the feedback resistors for

other output voltages, refer to Evaluating Other Output

Voltages in this document.

+12.0V Output Circuit

(NONBOOTSTRAPPED)

1) Verify that shunts are across pins 1 and 2 of

jumpers JU3 (SET, 3µs) and JU4 (SHDN).

2) Connect a +2.5V to +5.5V DC power supply to the

VIN2 pad. Connect the supply ground to the GND2

pad.

3) Turn on the power supply.

4) With a voltmeter, verify that the output voltage

VOUT2 is +12V.

For instructions on selecting the feedback resistors for

other output voltages, refer to Evaluating Other Output

Voltages in this document.

Detailed Description

The MAX1522 EV kit is a fully assembled and tested

surface-mount circuit board that contains two separate

step-up switching controller circuits.

The first circuit (left side), labeled BOOTSTRAPPED, uti-

lizes the MAX1524, is configured for +5.0V output, and

can deliver up to 1A of current with 3.3V input voltage.

The circuit requires a +1.5V to +5.5V input DC source.

The MAX1524 V

supply is bootstrapped to the output

to provide +5V gate drive with low input voltages. The

device features a fault-detect that reinitiates soft-start

whenever the output drops to half of its nominal voltage

regulation level.

The second circuit (right side), labeled NON-BOOT-

STRAPPED, utilizes the MAX1522, is configured for

+12V output, and can deliver up to 200mA of current

with 2.7V input voltage. The circuit requires a +2.5V to

+5.5V input DC source. The MAX1522 is not boot-

strapped to the output because during regulation the

+12.0V exceeds the maximum supply voltage rating of

the controller. The MAX1522 features a latched fault-

detect that can be reset by toggling the SHDN pin with

the jumper provided on the EV kit.

Each circuit requires an input DC source that can sup-

ply 2A of current. Both ICs implement soft-start to pre-

vent excessive input currents during startup. The

MAX1522 EV kit also provides jumpers to set the fixed

on-time of the N-channel MOSFETs. See Setting the

On-Time section.

Jumper Selection

Shutdown Mode

The MAX1522 EV kit features 3-pin jumpers (JU2 and

JU4) to shut down or power up the BOOTSTRAPPED or

NON-BOOTSTRAPPED circuits. Table 1 lists the selec-

table jumper options for jumpers JU2 and JU4.

DESIGNATION QTY DESCRIPTION

D1 1

2.2A, 30V Schottky diode (SMD)

Nihon EC31QS03L

D2 1

1A, 30V Schottky diode (SOT123)

Toshiba CRS02 or

Nihon EP10QY03

L1 1

3.3µH, 1.44A inductor

Sumida CR43-3R3

L2 1

33µH, 0.88A Inductor

Sumida CDR74B-330

U1 1

MAX1524EUT (6-pin SOT23)

(Top mark – AAOZ)

U2 1

MAX1522EUT (6-pin SOT23)

(Top mark – AAOX)

JU1–JU4 4 3-pin headers

None 4 Shunts (JU1–JU4)

None 1 MAX1522 PC board

None 1 MAX1522 data sheet

None 1 MAX1522 EV kit data sheet

Component List (continued)

Evaluates: MAX1522/MAX1523/MAX1524

MAX1522 Evaluation Kit

_______________________________________________________________________________________ 3

Setting the On-Time

The MAX1522 EV kit features 3-pin jumpers (JU1 and

JU3) to set the fixed on-time of the N-channel power

MOSFET in each circuit. Table 2 lists the selectable

jumper options for jumpers JU1 and JU3. Setting the

on-time to 3µs ensures an 80% maximum duty factor

and a maximum switching frequency of 285kHz.

Setting the on-time to 0.5µs ensures a 45% maximum

duty factor and a maximum switching frequency of

1MHz.

On the left circuit (BOOTSTRAPPED) of the

MAX1522EVKIT, the inductor has been selected for

0.5µs on-time. Before switching the shunt on jumper

JU1 from pins 2 and 3 (0.5µs on-time) to pins 1 and 2

(3.0µs on-time), it is necessary to change inductor L1

to a higher value and a higher saturation current rating

to prevent inductor saturation. Refer to the Design

Procedure section of the MAX1522 data sheet for

details.

On the right circuit (NON-BOOTSTRAPPED) of the

MAX1522EVKIT, the inductor and the output voltage

setting have been selected for 3.0µs on-time. Switching

the shunt on jumper JU3 from pins 1 and 2 (3.0µs on-

time) to pins 2 and 3 (0.5µs on-time) will prevent the

output voltage from reaching 12V under load. Refer to

the Design Procedure section of the MAX1522 data

sheet for details.

Evaluating Other Output Voltages

Left Circuit (+5V)

The EV kit contains a MAX1524 step-up controller on

the left side of the board (BOOTSTRAPPED) that is set

for +5V (VOUT1) output by two feedback resistors. To

generate output voltages other than +5V (+2.5V to

+5.5V), replace resistors R1 and R2. Refer to the

Component List to verify that the circuit’s components

will function properly if the output voltage is reconfig-

ured. The output voltages are determined by the follow-

ing equation:

VOUT1 = V

((R1 / R2) + 1)

where V

= 1.25V.

Right Circuit (+12V)

The MAX1522 EV kit contains a MAX1522 step-up con-

troller on the right side of the board (NONBOOT-

STRAPPED) that is set for +12V (VOUT2) output by two

feedback resistors. To generate output voltages other

than +12.0V, replace resistors R3 and R4. Refer to the

Component List to verify that the circuit’s components

will function properly if the output voltage is reconfig-

ured. The output voltages are determined by the follow-

ing equation:

VOUT2 = V

((R3 / R4) + 1)

where V

= 1.25V.

Evaluating the MAX1523

The MAX1522 EV kit can also evaluate the MAX1523

step-up controller. The MAX1523 is different from the

MAX1522 in that it doesn’t latch a fault-detect. To eval-

uate the MAX1523, replace the MAX1522, located on

the right circuit (NON-BOOTSTRAPPED), with the

MAX1523. To request MAX1523 samples, call the

phone number listed at the bottom of page 1 of this

data sheet and ask for MAX1523EUT samples.

SHUNT LOCATION JUMPER SHDN PIN FUNCTION

JU2 MAX1524 Enable

1 and 2

JU4

Connected to VIN

MAX1522* Enable

JU2 MAX1524 Disable

2 and 3

JU4

Connected to GND

MAX1522* Disable

Table 1. Jumper JU2 and JU4 Functions

SHUNT

LOCATION

SET PIN FUNCTION

1 and 2 C onnected to V CC 3.0µs On-Time

2 and 3 Connected to GND 0.5µs On-Time

Table 2. Jumper JU1 and JU3 Functions

*To reset a latched fault-detect condition, the respective IC must be disabled first and then enabled.

P1-P3 P4-P5

MAX1522EVKIT

Mfr. #:

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Manufacturer:

Maxim Integrated

Description:

Power Management IC Development Tools Eval Kit for MAX1522

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MAX1522EVKIT