Rainbow Electronics MAX1583 User Manual

General Description

The MAX1583 white LED boost converter drives up to
five white LEDs with a constant current to provide cam­era flash/strobe in cell phones, PDAs, DSCs, and other
hand-held devices. The MAX1583 includes a 24V boost
converter and a high-voltage LDO current regulator for
high efficiency and long battery life. 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.

The MAX1583X, MAX1583Y, and MAX1583Z offer high,
medium, and low current limits, respectively, to allow
tradeoff between reservoir capacitor size and peak
input current.

The MAX1583 is available in a 10-pin 3mm x 3mm
TDFN package (0.8mm max height).

Applications

Camera Flashes/Strobes

Cell Phones and Smart Phones

PDAs and Digital Still Cameras

Features

♦ Supports Up to Five LEDs for Strobe or Flash

♦ Four Operational Modes

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

♦ Input Current Limiting

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

♦ Small External Components

♦ 2.6V to 5.5V Input Range

♦ 24V Output Overvoltage Protection

♦ 80% Efficient (P

LED

/ PIN) Movie Mode

♦ Thermal-Shutdown Protection

♦ 10-Pin 3mm x 3mm TDFN Package

MAX1583

White LED Camera-Flash

Boost Converter

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3135; Rev 0; 1/04

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.

EVALUATION KIT

AVAILABLE

PART

TEMP RANGE

PIN-PACKAGE

MAX1583XETB

10 TDFN 3mm x 3mm

MAX1583YETB

10 TDFN 3mm x 3mm

MAX1583ZETB

10 TDFN 3mm x 3mm

8

9

10

OUT

LED

LX

3

2

1

MOV

IN

GND

7 EN2

4STB

6 EN1

5POK

TDFN

(3mm x 3mm)

MAX1583

TOP VIEW

Pin Configuration

PART

CURRENT LIMIT

TOP MARK

MAX1583XETB 1A ACJ

MAX1583YETB 500mA ACK

MAX1583ZETB 250mA ACL

Selector Guide

MAX1583

V

IN

2.6V TO 5.5V

LED

EN2

EN1

POK

GND

IN

LX

OUT

STB

MOV

I

LED

UP TO

300mA

EN1

0

0

1

1

SHUTDOWN

EN2

1

0

10PRECHARGE

MOVIE

STROBE

Typical Operating Circuit

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

MAX1583

White LED Camera-Flash
Boost Converter

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V

IN

= V

EN1

= 3.0V, V

EN2

= 0V, V

OUT

= 20V, C

OUT

= 10µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at

T

A

= +25°C. Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

IN, EN1, EN2, POK to GND ......................................-0.3V to +6V

LX, OUT to GND .....................................................-0.3V to +30V

STB, MOV to GND .......................................-0.3V to (V

IN

+ 0.3V)

LED to GND..............................................-0.3V to (V

OUT

+ 0.3V)

I

LX

...................................................................................1.2A

RMS

Continuous Power Dissipation (TA = +70°C)

10-Pin 3mm x 3mm TDFN

(derate 24.4mW/°C above +70°C).............................1951mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER CONDITIONS

MIN

TYP

MAX

UNITS

Supply Voltage 2.6 5.5 V

Undervoltage-Lockout Threshold VIN rising, hysteresis = 40mV (typ)

V

OUT Input Bias Current 41015µA

LX switching, LEDs off 2

Quiescent-Current Precharge Mode

LX not switching, LEDs off

mA

TA = +25°C

0.5

Quiescent-Current Shutdown Mode

TA = +85°C 0.1

µA

Output Overvoltage-Lockout Threshold

V

OUT

rising, precharge or movie mode,

hysteresis = 500mV (typ)

24

V

LED Regulation Voltage Threshold V

LED

rising, movie mode 0.5 0.6 0.7 V

TA = +25°C

1

LED Input Leakage Current Precharge mode

T

A

= +85°C 0.1

µA

MOV, STB Regulation Voltage 600 mV

Current-Source Multiplier in Movie Mode I

LED

/ I

MOV

, I

MOV

up to 300µA 100 A/A

Current-Source Accuracy, Movie Mode R

MOV

= 2kΩ, V

LED

= 0.5V -7 ±1 +7 %

MOV Current-Source Dropout Voltage I

LED

= 25mA, R

MOV

= 2kΩ 0.1 V

Current-Source Multiplier in Strobe Mode

I

LED

/ I

STB

, I

STB

up to 300µA

A/A

Current-Source Accuracy, Strobe Mode R

STB

= 2kΩ, V

LED

= 3.0V -10

%

STB Current-Source Dropout Voltage I

LED

= 250mA, R

STB

= 2kΩ 0.9 V

MAX1583X

MAX1583Y

500

Current Limit

MAX1583Z

250

mA

POK Low Voltage I

SINK

= 1mA

0.1 V

TA = +25°C

1

POK Leakage

T

A

= +85°C 0.1

µA

EN1 = EN2 = GND

2.10 2.38 2.55

0.32

0.01

22.5

800 1000 1200

400

200

0.01

1000

±1.5 +10

0.05

0.01

25.5

600

300

MAX1583

White LED Camera-Flash

Boost Converter

_______________________________________________________________________________________ 3

Note 1: All units are 100% production tested at TA= +25°C. Limits over the operating temperature range are guaranteed by design.

ELECTRICAL CHARACTERISTICS (continued)

(V

IN

= V

EN1

= 3.0V, V

EN2

= 0V, V

OUT

= 20V, C

OUT

= 10µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at

T

A

= +25°C. Note 1)

PARAMETER CONDITIONS

UNITS

EN1 and EN2 Input High Threshold VIN = 2.6V to 5.5V 1.6 V

EN1 and EN2 Input Low Threshold VIN = 2.6V to 5.5V 0.6 V

TA = +25°C

1

EN1 and EN2 Input Leakage EN_ = IN

T

A

= +85°C 0.1

µA

LX On-Resistance ILX = 200mA 1.3

Ω

TA = +25°C

5

LX Leakage VLX = 28V

T

A

= +85°C 0.1

µA

TA = 0°C to +85°C 0.8 1.0 1.2

Operating Frequency

T

A

= -40°C to +85°C

MHz

Maximum Duty Cycle Switching 90 94 %

Minimum Duty Cycle Pulse skipping 0 %

Typical Operating Characteristics

(V

IN

= 3.3V, C

RES

= 10µF, MAX1583Y, 4 LEDs in a 2 x 2 array, TA = +25°C, unless otherwise noted.)

EFFICIENCY vs. INPUT VOLTAGE

(MOVIE MODE)

MAX1583 toc01

INPUT VOLTAGE (V)

EFFICIENCY (%)

3.93.63.3

10

20

30

40

50

60

70

80

90

0

3.0 4.2

A: MAX1583X
B: MAX1583Y
C: MAX1583Z

I

LOAD

= 30mA

C

B

A

MAXIMUM BOOST OUTPUT CURRENT

vs. INPUT VOLTAGE (MAX1583X)

MAX1583 toc02

VIN (V)

I

OUT

(mA)

5.04.54.03.53.0

100

200

300

400

500

600

700

0

2.5 5.5

A

B

C

D

A: 1 LED
B: 2 LEDs
C: 3 LEDs
D: 4 LEDs

MAXIMUM BOOST OUTPUT CURRENT

vs. INPUT VOLTAGE

(MAX1583Y)

MAX1583 toc03

V

IN

(V)

I

OUT

(mA)

5.04.54.03.53.0

100

200

300

400

500

600

0

2.5 5.5

A

B

C

D

A: 1 LED
B: 2 LEDs
C: 3 LEDs
D: 4 LEDs

MIN TYP MAX

0.01

2.25

0.01

0.75 1.25