MAX1574ETB+T Maxim Integrated Products, MAX1574ETB+T Datasheet

MAX1574ETB+T

Manufacturer Part Number

MAX1574ETB+T

Description

IC LED DRVR WHITE BCKLGT 10-TDFN

Manufacturer

Maxim Integrated Products

Type

Backlight, White LEDr

Datasheet

1.MAX1574ETBT.pdf (9 pages)

Specifications of MAX1574ETB+T

Constant Current

Yes

Topology

Linear (LDO), Switched Capacitor (Charge Pump)

Number Of Outputs

Internal Driver

Yes

Type - Primary

Backlight, Flash/Torch

Type - Secondary

White LED

Frequency

1MHz

Voltage - Supply

2.7 V ~ 5.5 V

Voltage - Output

Mounting Type

Surface Mount

Package / Case

10-TDFN Exposed Pad

Operating Temperature

-40°C ~ 85°C

Current - Output / Channel

60mA

Internal Switch(s)

Yes

Efficiency

83%

Number Of Segments

Low Level Output Current

60 mA

Operating Supply Voltage

2.7 V to 5.5 V

Maximum Supply Current

2 mA

Maximum Power Dissipation

1454 mW

Maximum Operating Temperature

+ 85 C

Mounting Style

SMD/SMT

Minimum Operating Temperature

- 40 C

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Current page: 1 of 9
Download datasheet (215Kb)

The MAX1574 charge pump drives up to three white

LEDs with regulated constant current for uniform intensity.

By utilizing adaptive 1x/2x charge-pump modes and

very-low-dropout current regulators, it achieves 180mA

output drive capability and high efficiency over the 1-cell

lithium-battery input voltage range. Fixed-frequency

(1MHz) switching allows for tiny external components,

and the regulation scheme is optimized to ensure low EMI

and low input ripple.

The MAX1574 uses an external resistor to set the full-

scale 100% LED current. An enable input (EN) is used for

simple on/off control or can be pulsed repeatedly to set

lower LED current in multiple steps down to 5%. Once the

desired brightness is set, the MAX1574 maintains con-

stant LED current as long as EN is kept high. If EN is kept

low for more than 2ms, the MAX1574 enters shutdown.

The MAX1574 is available in a 10-pin 3mm x 3mm TDFN

package (0.8mm max height).

19-3117; Rev 0; 12/03

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.

LCD Backlighting

Camera Strobes/Flashes and Movie Lights

Cell Phones/Smart Phones

PDAs, Digital Cameras, and Camcorders

ON/OFF AND

DIMMING

1µF

2.7V TO 5.5V

Typical Operating Circuit

________________________________________________________________ Maxim Integrated Products

180mA, 1x/2x, White LED Charge Pump

GND

SET

General Description

MAX1574

0.22µF

LED1

LED2

LED3

OUT

Applications

UP TO 180mA

1µF

MAX1574ETB

TOP VIEW

Up to 180mA (60mA/LED) Drive Capability

83% Average Efficiency (P

Battery Discharge

0.5% (typ) LED Current Matching

Adaptive 1x/2x Mode Switchover

Low Input Ripple and EMI

5% to 100% Dimming Through Single-Wire Serial

Pulse Interface

Low 0.1µA Shutdown Current

2.7V to 5.5V Supply Voltage Range

Soft-Start Limits Inrush Current

Output Overvoltage Protection

Thermal-Shutdown Protection

10-Pin 3mm x 3mm TDFN Package

PART

in 3mm x 3mm TDFN

-40°C to +85°C

TEMP RANGE

3mm × 3mm

Ordering Information

MAX1574

TDFN

Pin Configuration

LED

4 4

PIN-

PACKAGE

10 TDFN

3mm x 3mm

/ P

BATT

Features

) Over Li+

MARK

TOP

ABB

Related parts for MAX1574ETB+T

MAX1574ETB+T Summary of contents

Page 1

... LED1 ON/OFF AND EN DIMMING LED2 SET LED3 ________________________________________________________________ Maxim Integrated Products 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. in 3mm x 3mm TDFN Up to 180mA (60mA/LED) Drive Capability 83% Average Efficiency (P Battery Discharge 0.5% (typ) LED Current Matching ...

Page 2

White LED Charge Pump in 3mm x 3mm TDFN ABSOLUTE MAXIMUM RATINGS IN, OUT GND..............................................-0.3V to +6.0V SET, LED1, LED2, LED3 GND .........-0. 0.3V GND ......................................................................-0.3V to the ...

Page 3

White LED Charge Pump ELECTRICAL CHARACTERISTICS (continued 3. GND SET (Note 1) PARAMETER EN Input Current EN Low Shutdown Delay EN t (Figure (Figure ...

Page 4

White LED Charge Pump in 3mm x 3mm TDFN (Circuit of Figure 3.6V IN, driving three white LEDs LED CURRENT MATCHING vs. INPUT SUPPLY VOLTAGE 1.0 0.8 0.6 0.4 0.2 0 ...

Page 5

White LED Charge Pump (Circuit of Figure 3.6V IN, driving three white LEDs DIMMING RESPONSE OUT V OUT PIN NAME Supply Voltage Input. Connect a 0.47µF to 1µF ...

Page 6

White LED Charge Pump in 3mm x 3mm TDFN Detailed Description The MAX1574 charge pump drives up to three white LEDs with regulated constant current for uniform inten- sity. By utilizing adaptive 1x/2x charge-pump modes and very-low-dropout current ...

Page 7

White LED Charge Pump Table 1. Recommended Components COMPONENT VALUE MANUFACTURER DESIGNATION 1µF IN OUT 0.22µF C1 0.47µF D1, D2, D3 — Required SET Applications Information Driving Fewer than Three LEDs When driving ...

Page 8

White LED Charge Pump in 3mm x 3mm TDFN 2. 1µF CONTROL AND EN DIMMING REFERENCE CONTROL AND ENABLE ON OFF CONTROLLED-CURRENT ERROR AMP2 SET R SET MAX1574 Figure 2. Functional Diagram and ...

Page 9

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9 © 2003 Maxim Integrated Products ...

Related keywords

max157
max1577
max1570ete
max1570
max1577y
max1574
MAX1574ETB+T datasheet
MAX1574ETB+T data sheet
MAX1574ETB+T pdf datasheet
MAX1574ETB+T component
MAX1574ETB+T part
MAX1574ETB+T distributor
MAX1574ETB+T RoHS
MAX1574ETB+T datasheet download