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PDF MAX1916EZT Data sheet ( Hoja de datos )
| Número de pieza | MAX1916EZT | |
| Descripción | Low-Dropout / Constant-Current Triple White LED Bias Supply | |
| Fabricantes | Maxim Integrated | |
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19-2067; Rev 0; 7/01
Low-Dropout, Constant-Current
Triple White LED Bias Supply
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.
Features
o Low 200mV Dropout at 9mA
o Up to 60mA/LED Bias Current
o 0.3% LED Current Matching
o Simple LED Brightness Control
o Low 40µA Supply Current
o Low 0.05µA Shutdown Current
o 2.5V to 5.5V Supply Voltage Range
o Thermal Shutdown Protection
o Tiny 6-Pin Thin SOT23 Package (1mm High)
Applications
Next-Generation Wireless Handsets
PDAs, Palmtops, and Handy Terminals
Digital Cameras, Camcorders
Battery-Powered Equipment
PART
MAX1916EZT
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-
PACKAGE
6 Thin SOT23
TOP
MARK
AAAG
Typical Operating Circuit
VCTRL
V+
ON
OFF
SET LED1 LED2 LED3
EN MAX1916
GND
TOP VIEW
Pin Configuration
EN 1
6 LED1
MAX1916
GND 2
5 LED2
SET 3
4 LED3
THIN SOT23-6
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
Low-Dropout, Constant-Current
Triple White LED Bias Supply
Pin Description
PIN NAME
FUNCTION
Enable Input/Power Input. Drive high (> 2.5V) to enable; drive low (< 2.2V) to disable. When
1 EN disabled, SET, LED1, LED2, and LED3 are high impedance. When enabled, EN is the power input
for the MAX1916.
2
GND
Ground
3 SET Bias Current Set Input. The current flowing into SET sets the bias current into each LED by
ILED_= 230 x ISET. VSET is internally biased to 1.215V. SET is high impedance when EN is low.
4
LED3
LED 3 Cathode Connection. Current flowing into LED3 is 230 times the current flowing into SET.
LED3 is high impedance when EN is low.
5
LED2
LED 2 Cathode Connection. Current flowing into LED2 is 230 times the current flowing into SET.
LED2 is high impedance when EN is low.
6
LED1
LED 1 Cathode Connection. Current flowing into LED1 is 230 times the current flowing into SET.
LED1 is high impedance when EN is low.
ON
OFF
EN
UVLO
REF 1.215V
GND
VCTRL
RSET
V+
SET LED1
THERMAL
SHUTDOWN
1X 230X
MAX1916
LED2
230X
LED3
230X
Figure 1. MAX1916 Simplified Functional Diagram
Detailed Description
The MAX1916 provides constant-current bias supply
for white LED designs. The MAX1916 uses a single
resistor to set the bias current for up to three LEDs.
LED bias currents are matched to 0.3% by the
MAX1916’s unique current-matching architecture
(Figure 1). Supply current (IEN) is a low 40µA in normal
operation and 0.05µA when disabled.
The MAX1916 offers several advantages over using
ballast resistors, such as improved LED-to-LED bright-
ness matching, lower bias variation with supply voltage
changes, significantly lower dropout voltage, and in
some applications, significantly improved efficiency.
The MAX1916 achieves a 200mV dropout with a 9mA
load on each output.
For circuits requiring only one or two LEDs, leave
unused LED outputs unconnected.
Enable Input
EN powers the input of the MAX1916. Drive EN high
(> 2.5V) to enable the device; drive EN low (< 2.2V) to
disable the device. When driven high, EN draws 40µA
to power the IC. Driving EN low forces LED1, LED2,
LED3, and SET into a high-impedance state.
_______________________________________________________________________________________ 5
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| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet MAX1916EZT.PDF ] | |
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