MAXIM MAX1583 User Manual

General Description

The MAX1583 evaluation kit (EV kit) is a fully assembled
and tested surface-mount circuit board for evaluating
the MAX1583 white LED flash boost converter. The EV
kit accepts a 2.6V to 5.5V input voltage and drives up
to five series white LEDs with a constant current to pro­vide camera flash/strobe in cell phones, PDAs, DSCs,
and other hand-held devices. The MAX1583 switching
frequency is 1MHz, allowing tiny external components.
Two logic inputs control four modes of operation: shut­down mode (0.5µA max), movie mode for high-efficien­cy continuous lighting (programmable up to 100mA),
precharge mode for charging a reservoir capacitor to
24V while the LEDs are off (POK output indicates a full
reservoir capacitor), and strobe mode for firing the flash
during an exposure with a regulated current program­mable up to 300mA (100mA with installed compo­nents). A pushbutton pulse generator is installed to sim­ulate a 30ms flash pulse.

The MAX1583 comes with the MAX1583X (1A current
limit) installed, but the entire MAX1583 family can be eval­uated with this EV kit with minor component changes.

Features

♦ Supports Up to 5 LEDs for Strobe/Flash

♦ Four Operational Modes

Strobe: Up to 300mA (Preset to 100mA)
Precharge: With POK Indicator
Movie: Up to 100mA (Preset to 20mA)
Shutdown: 0.01µA (typ) Quiescent Current

♦ Input Current Limiting

1A (MAX1583X)
500mA (MAX1583Y)
250mA (MAX1583Z)

♦ 24V Output Overvoltage Protection

♦ 80% Efficient (P

LED

/ PIN) Movie Mode

♦ Thermal-Shutdown Protection

♦ 10-Lead 3mm x 3mm TDFN Package

♦ Surface-Mount Components

♦ Fully Assembled and Tested

Evaluates: MAX1583

MAX1583 Evaluation Kit

________________________________________________________________ Maxim Integrated Products 1

19-3246; Rev 0; 4/04

Component List

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.

Ordering Information

PART

IC PACKAGE

MAX1583EVKIT

10 TDFN 3mm x 3mm

Note: To evaluate the MAX1583Y or MAX1583Z, request a
MAX1583YETB or MAX1583ZETB free sample with the
MAX1583 EV kit.

查询MAX1583EVKIT供应商

TEMP RANGE

0°C to +70°C

DESIGNATION QTY DESCRIPTION

22µF, 6.3V X5R ceramic capacitor

C1 1

C2 1

C3, C4 2

C5 1

D1 1

(0805)
TDK C2012X5R0J226M

10µF ±10%, 25V X5S ceramic
capacitor (1206)
Taiyo Yuden TMK316C106KL

0.01µF ±10%, 16V X7R ceramic
capacitors (0402)
TDK C1005X7R1E103K

0.1µF ±10%, 25V X7R ceramic
capacitor (0603)
TDK C1608X7R1E104K

30V, 500mA, V
diode (SOD-323)
Diodes, Inc. B0530WS

= 0.4V Schottky

F

DESIGNATION QTY DESCRIPTION

D2 1

D5 1

JU1, JU2 2 3-pin headers

JU3 1 2-pin header

L1 1

R1 1 6.04kΩ ±1% resistor (0402)

R2 1 3.01kΩ ±1% resistor (0402)

R3, R4, R5 3 100kΩ ±5% resistors (0402)

SW1 1

White LED module
Nichia NBCW011T

30V, 100mA Schottky diode (SOD

523)
Central Semiconductor CMOSH-3

4.7µH, 1.06A, 450mΩ
TOKO 984FB-4R7M

Momentary pushbutton switch
Panasonic EVQ-PHP03T

Evaluates: MAX1583

MAX1583 Evaluation Kit

2 _______________________________________________________________________________________

Recommended Equipment

•0 to +6V at 1A, variable-output power supply

• Two digital multimeters (DMMs)

Quick Start

The MAX1583 EV kit is fully assembled and tested.
Perform the following steps to verify board operation:

1) Verify that shunts are across pins 2 and 3 of
jumpers JU1 (EN2) and JU2 (EN1). This places the
MAX1583 into shutdown mode.

2) Verify that JU3 is open.

3) Preset the power supply to 2.7V and turn off. Do

not turn on the power supply until all connec­tions are completed.

4) Connect the positive lead of the power supply to the
VIN pad on the EV kit PC board. Connect the
ground lead of the power supply to the GND pad on
the EV kit PC board.

5) Connect the positive lead of one DMM to the OUT
pad on the EV kit PC board and connect the nega­tive lead of the DMM to the GND pad. This DMM
measures the voltage at OUT (V

OUT

).

6) Connect the positive lead of the other DMM to POK
on the EV kit PC board and connect the negative
lead of the DMM to the GND pad. This DMM mea­sures the voltage at POK (V

POK

).

7) Turn on the power supply.

8) Verify that the white LED module is off.

9) Remove the shunt on JU2 and place it between
pins 1 and 2 of JU2. This places the MAX1583 into
movie mode.

10) Verify that the white LED module lights up. V

OUT

should read approximately 7V.

11) Sweep the input voltage from 2.7V to 5.5V, verifying
that the LED module remains on with constant
brightness and V

OUT

does not change.

12) Set the power supply to 2.7V.

13) Remove the shunt on JU2 and place it between
pins 1 and 2 of JU3. Remove the shunt on JU1 and
place it between pins 1 and 2 of JU1. This places
the MAX1583 into precharge mode.

14) Verify that the white LED module is off. Verify that
V

OUT

is approximately 23.5V and V

POK

is approxi-

mately 2.7V.

15) Sweep the power supply to 5.5V. Verify that the LED
module remains off, V

OUT

is approximately 23.5V,

and V

POK

tracks V

VIN

.

16) Set the power supply to 3.3V.

17) Push the button on the bottom of the EV kit. This
enables a strobe/flash.

18) Verify that the LED module flashes.

Detailed Description

Jumper Selection

EN1 and EN2 on the MAX1583 provide control for shut­down mode, movie mode, precharge mode, and strobe
mode. Jumpers JU1 and JU2 connect EN2 and EN1 to
either VIN or GND (see Table 1). An external signal can
be used to drive EN1 or EN2 by removing the corre­sponding shunt completely from the jumper and con­necting the external signal to the appropriate connect­ing pad. JU3 enables the pulse generator for the strobe
mode. JU3 must be open if a jumper is installed on

JU2 or if EN1 is externally driven.

Setting LED Current

The preset LED current in movie mode is 20mA. To set
a different movie-mode LED current, change R2, where
R2 = 60 / I

LED(MOVIE)

. The MAX1583 is capable of

movie-mode currents up to 100mA.

The preset LED current in strobe mode is 100mA. To
set a different strobe-mode LED current, change R1,
where R1 = 600 / I

LED(STROBE)

. The MAX1583 can reg­ulate strobe-mode LED currents up to 300mA; however,
the LED installed on the MAX1583 EV kit has a maxi­mum pulse-current rating of 100mA. If larger currents
are desired, a new LED with a higher pulsed current
rating must be installed on the EV kit.

Evaluating Off-Board LEDs

The MAX1583 EV kit allows for easy evaluation of off­board LEDs. To evaluate off-board LEDs, first remove
the installed LED module, D2. Next, connect the pad
labeled OUT on the EV kit to the anode of the series
LED string under evaluation and connect the cathode
of the external series LED string to the EV kit pad
labeled LED.

Component List (continued)

DESIGNATION

QTY

DESCRIPTION

U1

MAX1583XETB (10-pin TDFN)

U2

MAX6422XS23 (SOT23)

None

Shunts

None

MAX1583 EV kit PC board

1

1

2

1