DatasheetsPDF.com

WLED Drivers. MAX17149 Datasheet

DatasheetsPDF.com

WLED Drivers. MAX17149 Datasheet







MAX17149 Drivers. Datasheet pdf. Equivalent




MAX17149 Drivers. Datasheet pdf. Equivalent





Part

MAX17149

Description

(MAX17129 / MAX17149) 6-String WLED Drivers

Manufacture

Maxim Integrated Products

Datasheet
Download MAX17149 Datasheet


Maxim Integrated Products MAX17149

MAX17149; EVALUATION KIT AVAILABLE MAX17129/MAX17 149 Low-Cost, 6-String WLED Drivers wi th Quick-PWM Step-Up Converter General Description The MAX17129/MAX17149 are high-efficiency drivers for white LEDs. They are designed for small- to medium sized LCDs that employ an array of LEDs as the light source. An internal switc h step-up controller with QuickPWM™ d rives the LED array,.


Maxim Integrated Products MAX17149

which can be configured for up to 6 str ings in parallel and either 11 LEDs (MA X17129) or 6 LEDs in series (MAX17149) per string. Each string is terminated w ith a ballast that achieves ±2% curren tregulation accuracy, ensuring even LED brightness and provides an adjustable 10mA to 45mA full-scale LED current. Th e devices have a wide input voltage ran ge of 6V to 26V. Th.


Maxim Integrated Products MAX17149

e MAX17129 integrates an LDO to simplify applications that have a single high-v oltage supply. The devices also feature a low-input-voltage mode for applicati ons that have a 3V to 5.5V supply volta ge. The devices support both PWM and hy brid dimming mode. In PWM dimming mode, the external PWM signal directly contr ols the brightness of LEDs. The dimming frequency ranges .



Part

MAX17149

Description

(MAX17129 / MAX17149) 6-String WLED Drivers

Manufacture

Maxim Integrated Products

Datasheet
Download MAX17149 Datasheet




 MAX17149
EVALUATION KIT AVAILABLE
MAX17129/MAX17149
Low-Cost, 6-String WLED Drivers with
Quick-PWM Step-Up Converter
General Description
The MAX17129/MAX17149 are high-efficiency drivers
for white LEDs. They are designed for small- to medium-
sized LCDs that employ an array of LEDs as the light
source. An internal switch step-up controller with Quick-
PWM™ drives the LED array, which can be configured for
up to 6 strings in parallel and either 11 LEDs (MAX17129)
or 6 LEDs in series (MAX17149) per string. Each string
is terminated with a ballast that achieves ±2% current-
regulation accuracy, ensuring even LED brightness and
provides an adjustable 10mA to 45mA full-scale LED
current. The devices have a wide input voltage range of
6V to 26V. The MAX17129 integrates an LDO to simplify
applications that have a single high-voltage supply. The
devices also feature a low-input-voltage mode for applica-
tions that have a 3V to 5.5V supply voltage.
The devices support both PWM and hybrid dimming
mode. In PWM dimming mode, the external PWM signal
directly controls the brightness of LEDs. The dimming fre-
quency ranges from 100Hz to 25kHz with 400ns minimum
on-time. In hybrid dimming mode, the LED current ampli-
tude can be adjusted to 25% of full-scale LED current to
improve system efficiency when brightness is low.
The devices have multiple features to protect the
controller from fault conditions. Separate voltage-
feedback loops limit the output voltage to safe operation.
The open- and short-LED detection shuts down the faulty
string while keeping other strings operating normally.
The devices feature cycle-by-cycle current limit on the
internal switch to provide consistent operation and soft-
start capability. If the devices are in current-limit condition,
the step-up converter is latched off after an internal timer
expires. A thermal-shutdown circuit provides another level
of protection and prevents ICs from damage.
The ICs’ step-up controller features an internal 0.25Ω
(typ), 48V (max) power MOSFET with lossless current
sense and accurate cycle-by-cycle current limit. The
Quick-PWM control architecture provides fast load-tran-
sient response without requiring an external loop com-
pensation component, simplifies the external circuitry, and
saves board area. The Quick-PWM control scheme has
constant off-time and adjustable pseudo-fixed frequency,
which enables a wide variety of applications that can trade
off component size for operating frequency. Low feedback
voltage at each LED string (275mV typ at 20mA LED
current) helps reduce power loss and improve efficiency.
The ICs are available in a 16-pin, thin QFN package with
0.5mm lead spacing. The package is 3mm x 3mm with a
maximum thickness of 0.8mm for ultra-thin LCD panel design.
Features
● Independently Controlled Dual Paths
● 3V to 26V Input Supply Voltage
● Up to Six Parallel Strings of Multiple Series-
Connected LEDs
● Step-Up Regulator with Quick-PWM Control Scheme
● Two-Level Selectable Switching Frequency
0.25Ω Internal HV Power MOSFET (48V max)
● Low String Feedback Voltage: 275mV at 20mA LED
Current
● Full-Scale LED Current Adjustable from 10mA to
45mA
● ±2% Current-Regulation Accuracy Between Strings
● Support PWM and Hybrid Dimming Mode
● 100:1 Dimming Ratio
● 100Hz to 25kHz Dimming Frequency for PWM
Dimming Mode
● Open- and Short-LED Protection
● Output-Overvoltage Protection
● Small 16-Pin, 3mm x 3mm Thin QFN Package
Applications
● Notebook, Subnotebook, and Tablet Computer
Displays
● Handy Terminals
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX17129ETE + -40°C to +85°C 16 Thin QFN-EP*
MAX17149ETE+ -40°C to +85°C 16 Thin QFN-EP*
+Denotes lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Simplified Operating Circuit appears at end of data sheet.
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
19-5676; Rev 2; 11/14





 MAX17149
MAX17129/MAX17149
Low-Cost, 6-String WLED Drivers with
Quick-PWM Step-Up Converter
Absolute Maximum Ratings
FSEL, IN, BRT, EN to GND ...................................-0.3V to +28V
FB_, LX, OVP to PGND..........................................-0.3V to +48V
PGND to GND.......................................................-0.3V to +0.3V
VCC to GND..............................................................-0.3V to +6V
ISET to GND................................................ -0.3V to VCC + 0.3V
LX Switch Continuous RMS Current......................................1.6A
Continuous Power Dissipation (TA = +70°C)
16-Pin Thin QFN (derate 14.7mW/°C above +70°C)..1176mW
Operating Temperature Range..............................-40°C to +85°C
Junction Temperature.......................................................+150°C
Storage Temperature Range...............................-60°C to +150°C
ESD
HBM..................................................................................±2kV
MM..................................................................................±200V
Lead Temperature (soldering, 10s)...................................+300°C
Soldering Temperature (reflow)........................................+260°C
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.
Electrical Characteristics
(Circuit of Figure 1. VIN = 12V, RISET = 100kΩ, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
CONDITIONS
IN Input Voltage Range
IN Standby Current
VCC Output Voltage
VCC Current Limit
VCC UVLO Threshold
IN UVLO Threshold
STEP-UP CONVERTER
IN not connected to VCC
IN connected to VCC
VEN = 3V, VIN = 26V, no external loads
VEN = 0V, VIN = 26V
VEN = 3V, 0 < IVCC < 10mA
VCC is forced to 3.5V; IN not connected to VCC
Rising edge, typical hysteresis = 100mV
Rising edge, typical hysteresis = 100mV;
IN not connected to VCC
LX On-Resistance
100mA from LX to PGND
LX Leakage Current
Off-Time
LX Peak Current Limit
VLX = 40V, TA = +25°C
FSEL = GND, VIN = 12V, VOVP = 22V
FSEL = VCC, VIN = 12V, VOVP = 22V
Duty cycle = 75%
Minimum On-Time
Minimum Output Regulation
Voltage
MAX17129 only
MAX17149 only
Maximum Output Regulation
Voltage
MAX17129 only
MAX17149 only
INPUT LEAKAGE/BIAS CURRENTS
EN Bias Current
BRT Bias Current
EN Input Impedance
0.3V < VEN < 3.5V, TA = +25°C
4.1V < VEN < 26V, TA = +25°C
0.3V < VBRT < 3.5V, TA = +25°C
4.1V < VBRT < 26V, TA = +25°C
OVP Input Current
FSEL Bias Current
MAX17129 only; VOVP = 40V, VFB = 0.75V
MAX17149 only; VOVP = 20V, VFB = 0.75V
0.3V < VFSEL < 3.5V, TA = +25°C
4.1V < VFSEL < 26V, TA = +25°C
MIN
6
3.0
3.6
15
2.75
5.5
TYP
3.2
0.1
3.8
30
2.8
5.75
MAX
26
5.5
4
5
4.0
45
2.85
5.9
UNITS
V
mA
µA
V
mA
V
V
450
900
2.5
15
6.8
41.5
23.9
250
0.05
500
1000
3
50
16.5
8.3
43
25.4
500
1
550
1100
3.5
18
9.8
44.5
26.9
mΩ
µA
ns
A
ns
V
V
V
V
6
110
15
2000
750 1500
15 50
7.5 25
6
2000
µA
µA
kΩ
µA
µA
µA
www.maximintegrated.com
Maxim Integrated 2





 MAX17149
MAX17129/MAX17149
Low-Cost, 6-String WLED Drivers with
Quick-PWM Step-Up Converter
Electrical Characteristics (continued)
(Circuit of Figure 1. VIN = 12V, RISET = 100kΩ, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
CONDITIONS
LED CURRENT SOURCE
ISET Resistance Range
Full-Scale FB_ Output Current
ISET Output Voltage
RISET = 44.44k
RISET = 66.66k
RISET = 100k
RISET = 133.33k
RISET = 200k
RISET = 100k, hybrid dimming mode
RISET = 250k, hybrid dimming mode
Current Regulation Between
Strings
Minimum FB_ Regulation Voltage
FB_ On-Resistance
FB_ Leakage Current
FB_ On-Time
IFB_ = 30mA
IFB_ = 20mA
IFB_ = 15mA
IFB_ = 10mA
IFB_ = 5mA, hybid dimming ode
IFB_ = 2mA, hybrid dimming mode
RISET = 66.66k, 100% duty cycle
RISET = 100k, 100% duty cycle
RISET = 133.33k, 100% duty cycle
RISET = 200k, 100% duty cycle
VFB_ = 50mV
VFB_ = 28V, TA = +25°C, EN = 0V, VOVP = 28V
VFB_ = 40V, TA = +25°C, EN = 0V, VOVP = 40V
BRT Input High Level
BRT Input Low Level
BRT Dimming Frequency
EN Input High Level
MAX17129/MAX17149 enabled, PWM dimming mode
MAX17129/MAX17149 enabled, hybrid dimming mode
EN Input Low Level
FAULT PROTECTION
OVP Overvoltage
Rising edge, hysteresis = 1.8V
FB_ Check LED Source Current
FB_ Check LED Time
Sequence for 6 channels
FB_ Open LED Threshold
FB_ Overvoltage Threshold
Thermal-Shutdown Threshold
(Note 2)
Thermal-Shutdown Hysteresis
(Note 2)
BOOST FREQUENCY SELECTION FSEL
FSEL Input High Level
FSEL Input Low Level
Select fSW = 500kHz
Select fSW = 1000kHz
MIN TYP MAX UNITS
44
43.3
29.1
19.4
14.55
9.65
4.4
1.4
1.225
-1.5
-2.0
-2.0
-2.75
-6.0
-15.0
300
2.1
0.1
2.1
1.4
45
30
20
15
10
5
2
1.250
375
275
200
125
0.05
2.5
250
47.7
30.9
20.6
15.45
10.35
5.6
2.6
1.275
+1.5
+2.0
+2.0
+2.75
+6.0
+15.0
550
365
275
200
20
1
5
0.8
25
1.8
0.8
kΩ
mA
V
%
mV
µA
ns
V
V
kHz
V
V
44.1
0.60
6.7
45.1
0.665
1
500
8.0
+160
15
46.1
0.73
700
9.6
V
mA
ms
mV
V
°C
°C
2.1 V
0.8 V
www.maximintegrated.com
Maxim Integrated 3



Recommended third-party MAX17149 Datasheet






@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)