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MAX1916EZTMAXIMN/a1500avaiLow-Dropout / Constant-Current Triple White LED Bias Supply


MAX1916EZT ,Low-Dropout / Constant-Current Triple White LED Bias SupplyApplications Ordering InformationNext-Generation Wireless HandsetsPIN- TOPPART TEMP. RANGEPACKAGE M ..
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MAX1916EZT+T ,Low-Dropout, Constant-Current Triple White LED Bias SupplyFeaturesThe MAX1916 low-dropout bias supply for white LEDs♦ Low 200mV Dropout at 9mAis a high-perfo ..
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MAX1917EEE+ ,Tracking, Sinking and Sourcing, Synchronous Buck Controller for DDR Memory and Termination SuppliesApplicationsDDR Memory Power Notebook ComputersOrdering InformationSupplyDesktop ComputersPART TEMP ..
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MAX1916EZT
Low-Dropout / Constant-Current Triple White LED Bias Supply
MAX1916
Low-Dropout, Constant-Current riple White LED Bias Supply

19-2067; Rev 0; 7/01
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 9mAUp to 60mA/LED Bias Current0.3% LED Current MatchingSimple LED Brightness ControlLow 40µA Supply CurrentLow 0.05µA Shutdown Current2.5V to 5.5V Supply Voltage RangeThermal Shutdown ProtectionTiny 6-Pin Thin SOT23 Package (1mm High)
Pin Configuration
Typical Operating Circuit
Ordering Information
MAX1916
Low-Dropout, Constant-Current riple White LED Bias Supply
ABSOLUTE MAXIMUM RATINGS

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.
correlation using statistical quality control (SQC) methods.
Note 2:
Dropout Voltage is defined as the LED_ to GND voltage at which current sink into LED_ drops 20% from the value at
VLED= 1V.
Note 3:
Dropout Voltage is defined as the LED_ to GND voltage at which current sink into LED_ drops 10% from the value at
VLED= 1V.
EN, SET, LED1, LED2, LED3 to GND .....................-0.3V to +6V
Continuous Power Dissipation (TA= +70°C)
6-Pin Thin SOT23 (derate 9.1mW/°C above +70°C) ...727mW
Operating Temperature Range .........................-40°C to +85°C
Storage Temperature Range ...........................-65°C to +150°C
Lead Temperature (soldering, 10s)...................................300°C
ELECTRICAL CHARACTERISTICS
MAX1916
Low-Dropout, Constant-Current riple White LED Bias Supply

LED CURRENT vs.
V+ BIAS VOLTAGE

MAX1916 toc01
V+ BIAS VOLTAGE (V)
LED CURRENT (mA)356
OUTPUT CURRENT
vs. VEN SUPPLY VOLTAGE
MAX1916 toc02
VEN SUPPLY VOLTAGE (V)
OUTPUT CURRENT (mA)
LED CURRENT vs.
TEMPERATURE
MAX1916 toc03
TEMPERATURE (°C)
LED CURRENT (mA)
LED CURRENT
vs. RSET
MAX1916 toc04
RSET (kΩ)
LED CURRENT (mA)
LED CURRENT (ILED)
vs. VCTRL
MAX1916 toc05
VCTRL (V)
LED CURRENT (mA)
A: RSET = 10kΩ
B: RSET = 15kΩ
C: RSET = 22kΩ
D: RSET = 33kΩ
E: RSET = 47kΩ
F: RSET = 68kΩ
G: RSET = 100kΩ
LED DROPOUT VOLTAGE
vs. CURRENT
MAX1916 toc06
LED CURRENT (mA)
LED DROPOUT VOLTAGE (mV)
Typical Operating Characteristics

(VEN= 3.3V, VCTRL= 3.3V, RSET= 24.9kΩ, V+ = 5V, TA= +25°C, unless otherwise noted.) (Circuit of Figure 1)
MAX1916
Low-Dropout, Constant-Current riple White LED Bias Supply
ENABLE AND SHUTDOWN RESPONSE

MAX1916 toc08
20mA
ILED
20mA/div
VEN
2V/div
40µs/div
IEN SUPPLY CURRENT
vs. VEN SUPPLY VOLTAGE
MAX1916 toc07
VEN SUPPLY VOLTAGE (V)
IEN
SUPPLY CURRENT (
VCTRL TRANSIENT RESPONSE

MAX1916 toc09
20mA
10mA
ILED
10mA/div
VCTRL
1V/div
10µs/div
V+ TRANSIENT RESPONSE

MAX1916 toc10
20mA
10mA
ILED
10mA/div
1V/div
20µs/div
Typical Operating Characteristics (continued)

(VEN= 3.3V, VCTRL= 3.3V, RSET= 24.9kΩ, V+ = 5V, TA= +25°C, unless otherwise noted.) (Circuit of Figure 1)
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.
MAX1916
Low-Dropout, Constant-Current riple White LED Bias Supply
MAX1916
Setting the Output Current

SET controls the LED bias current. Current flowing into
LED1, LED2, and LED3 is 230 times greater than the
current flowing into SET. Set the output current as fol-
lows:
where VSET= 1.215V, VCTRLis an external voltage
between 1.8V and 5.5V, and RSETis the resistor con-
nected between VCTRLand SET (Figure 1).
Applications Information
Very Low-Cost, High-Efficiency Solution (Figure 2).
A battery (single Li+ or three NiMH cells) powers
the LEDs directly. This is the least expensive and
most efficient architecture. Due to the high forward
voltage of white LEDs (3.3V), the LED brightness
may dim slightly at the end of battery life. The
MAX1916’s current-regulating architecture and low
dropout greatly minimize this effect compared to
using simple ballast resistors. The enable function
of the MAX1916 turns on and off the LEDs. An exist-
ing low-dropout regulator is used as VCTRL.Brightness Adjustment Using a DAC (Figure 3). A
DAC is used as VCTRLsuch that the LED brightness
may be dynamically adjusted to eliminate factory
calibration. A battery (single Li+ or three NiMH
cells) or a regulated power source drives the LEDs.Existing 5V Supply (Figure 4). Use an existing sys-
tem regulator, such as the MAX684, to provide the
required LED voltage and provide power to other
circuits. Due to the high forward voltage of white
LEDs (3.3V), use a 3.6V to 5.5V regulated supply to
provide enough voltage headroom such that the
LEDs will maintain constant brightness for any bat-
tery voltage. Use the existing regulated supply as
VCTRL.
Chip Information

TRANSISTOR COUNT: 220
PROCESS: BiCMOS
Low-Dropout, Constant-Current riple White LED Bias Supply
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