Myalarm V-LED1 Uživatelský manuál stáhnout pdf

MAX1916

Low-Dropout, Constant-Current

Triple White LED Bias Supply

________________________________________________________________ Maxim Integrated Products 1

19-2067; Rev 0; 7/01

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.

General Description

The MAX1916 low-dropout bias supply for white LEDs

is a high-performance alternative to the simple ballast

resistors used in conventional white LED designs. The

MAX1916 uses a single resistor to set the bias current

for three LEDs, which are matched to 0.3%. The

MAX1916 consumes only 40µA of supply current when

enabled and 0.05µA when disabled.

The MAX1916’s advantages over ballast resistors

include significantly better LED-to-LED bias matching,

much lower bias variation with supply voltage variation,

significantly lower dropout voltage, and in some appli-

cations, significantly improved efficiency. The MAX1916

requires a 200mV dropout at a 9mA load on each out-

put to match the LED brightness.

The MAX1916 is available in a space-saving 6-pin Thin

SOT23 package.

Applications

Next-Generation Wireless Handsets

PDAs, Palmtops, and Handy Terminals

Digital Cameras, Camcorders

Battery-Powered Equipment

Features

♦ Low 200mV Dropout at 9mA

♦ Up to 60mA/LED Bias Current

♦ 0.3% LED Current Matching

♦ Simple LED Brightness Control

♦ Low 40µA Supply Current

♦ Low 0.05µA Shutdown Current

♦ 2.5V to 5.5V Supply Voltage Range

♦ Thermal Shutdown Protection

♦ Tiny 6-Pin Thin SOT23 Package (1mm High)

GND

LED3SET

16LED1

5 LED2

MAX1916

THIN SOT23-6

TOP VIEW

Pin Configuration

MAX1916

OFF

GND

SET

LED1 LED2 LED3

CTRL

V+

Typical Operating Circuit

Ordering Information

PART TEMP. RANGE

PIN-

PACKAGE

TOP

MARK

MAX1916EZT

-40°C to +85°C

6 Thin SOT23

AAAG

1 2 3 4 5 6 7

Triple White LED Bias Supply 1

Shrnutí obsahu

Strany 1 - Triple White LED Bias Supply

MAX1916Low-Dropout, Constant-Current Triple White LED Bias Supply________________________________________________________________ Maxim Integrated Pro

Strany 2

MAX1916Low-Dropout, Constant-Current Triple White LED Bias Supply2 ___________________________________________________________________________________

Strany 3

MAX1916Low-Dropout, Constant-Current Triple White LED Bias Supply_____________________________________________________________________________________

Strany 4

MAX1916Low-Dropout, Constant-Current Triple White LED Bias Supply4 ___________________________________________________________________________________

Strany 5

Detailed DescriptionThe MAX1916 provides constant-current bias supplyfor white LED designs. The MAX1916 uses a singleresistor to set the bias current

Strany 6

MAX1916Setting the Output CurrentSET controls the LED bias current. Current flowing intoLED1, LED2, and LED3 is 230 times greater than thecurrent flow

Strany 7

MAX1916Low-Dropout, Constant-Current Triple White LED Bias SupplyMaxim cannot assume responsibility for use of any circuitry other than circuitry enti