900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Maxim Integrated Semiconductor Electronic Components Datasheet

MAX16840 Datasheet

LED Driver

No Preview Available !

MAX16840
EVALUATION KIT AVAILABLE
LED Driver with Integrated MOSFET
for MR16 and Other 12V AC Input Lamps
General Description
The MAX16840 is an LED driver IC for lighting applica-
tions. It includes all the necessary features to design low-
component-count LED drivers for 12V AC and 24V AC
input (e.g., MR16) light bulbs. A proprietary input-current
control scheme allows LED lamps based on this device
to be compatible with electronic transformers, and dim-
mable with standard trailing-edge dimmers (where elec-
tronic transformers are present).
The IC can be used in buck, boost, and buck-boost
topologies and features. It has an integrated 0.2I (max),
48V switching MOSFET.
The IC uses constant-frequency average current-mode
control. It senses the input current through the voltage
at the FB pin, and regulates its average. An input pin
(REFI) allows the setting of the input-current level. When
the voltage at this pin is set below a certain threshold, the
input current is proportional to this voltage, while when
that voltage is beyond the threshold, the input current is
set at a fixed, predefined level. This nonlinear behavior of
REFI allows its use to achieve thermal foldback, by con-
necting it to an NTC resistor.
The IC also features an internal overvoltage protection on
the IN pin to protect the internal switching MOSFET from
damage if the LED string is open or if the voltage on the
LED string is too high.
The IC has a separate EXT pin that can be used to guar-
antee that there is a kick-start of current at turn-on for low-
input voltages for proper operation with electronic trans-
formers. EXT drives an external npn transistor. Once the
UVLO threshold of 5.5V is crossed on IN, EXT is pulled
to ground and the external npn transistor is turned off.
The IC is available in a 3mm x 3mm, 10-pin TDFN power
package, and is rated over the -40NC to +125NC operat-
ing temperature range.
Applications
MR16 and Other 12V AC or DC Input LED
Lighting Applications
Benefits and Features
● Cost-Effective Solution for MR16 and Other SSL
Applications
• Proprietary Input Current-Control Scheme to
Achieve Electronic Transformer Compatibility
and Dimmability
• Buck, Boost, SEPIC, and Buck-Boost
Topologies
• Analog Dimming
● Minimal Component Count Saves Cost and Space
• Integrated 0.2Ω (max) 48V Switching MOSFET
Protection Features and Wide Operating Temperature
Range Improves Reliability
• Thermal-Foldback Protection
• Output Overvoltage Protection
• Internal Overtemperature Protection
• Available in a 10-Pin Thermally Enhanced TDFN
Package
• Operation Over -40°C to +125°C Temperature
Range
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX16840ATB+ -40NC to +125NC
10 TDFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Operating Circuit
L1
12V AC
BD1
L2 D1
R3
C1
DRAIN
REFI
EXT MAX16840
IN
COMP
C4
SOURCE
FB
GND
R2
LED-
C2 LED+
R1
19-5671; Rev 4; 1/15


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX16840 Datasheet

LED Driver

No Preview Available !

MAX16840
LED Driver with Integrated MOSFET
for MR16 and Other 12V AC Input Lamps
Absolute Maximum Ratings
IN, DRAIN to GND..................................................... -0.3V, +52V
EXT, COMP, REFI to GND........................................ -0.3V, +6.0V
FB, SOURCE to GND............................................... -0.3V, +1.5V
Maximum RMS Current, FB, SOURCE to GND.....................0.8A
Maximum RMS Current Through DRAIN and SOURCE....... Q2A
Continuous Power Dissipation (TA = +70NC)
TDFN (derate 24.4mW/NC above +70NC)...................1951mW
Any Pin to Any Pin ESD Rating................................ ±2kV (HBM)
Operating Temperature Range......................... -40NC to +125NC
Maximum Junction Temperature......................................+150NC
Storage Temperature Range............................. -65NC to +150NC
Lead Temperature (soldering, 10s).................................+300NC
Soldering Temperature (reflow).......................................+260NC
Package Thermal Characteristics (Note 1)
TDFN
Junction-to-Ambient Thermal Resistance (BJA).......... 41NC/W
Junction-to-Case Thermal Resistance (BJC)................. 9NC/W
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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
(VIN = 12V; VEXT = VSOURCE = VFB = VGND = 0V; COMP, REFI, and DRAIN = open; TA = TJ = -40NC to +125NC, unless otherwise
noted. Typical values are at TA = +25NC.) (Note 2)
PARAMETER
Operating Voltage Range
IN Supply Current
Undervoltage Lockout
UVLO Hysteresis
Overvoltage Protection on IN
OVP Hysteresis
Switching Frequency
Ramp P-P Voltage
FB Average Voltage
Transconductance
No-Load Gain
COMP Sink Current
COMP Source Current
Power Switch On-Resistance
Switch Leakage Current
DRAIN Rise Time
DRAIN Fall Time
SOURCE Limit Threshold
SYMBOL
VIN
IIN
UVLOIN
VOVP
CONDITIONS
 
When MOSFET fully on
When MOSFET switching, VCOMP = 2V,
drain to 5V through 50I 
IN rising
 
IN rising
 
TA = +25NC
-40°C P TA P +125NC
gm  
ISINK
VCOMP = 2V, VFB = 0.65V
ISOURCE VCOMP = 2V, VFB = 0V
RDSON IDS = 1A
ILEAK
VDRAIN = 48V, VCOMP = 0V
tRDRAIN IDS = 1A
tFDRAIN IDS = 1A
VSOURCETH SOURCE connected to FB
MIN
6.5
5
43.6
270
196
190
150
70
0.66
TYP
1
1.5
5.6
200
46
1.2
300
2
200
550
75
250
115
0.1
10
10
0.72
MAX
48
2
3
6.1
48
330
204
210
350
160
0.2
25
0.78
UNITS
V
mA
V
mV
V
V
kHz
V
mV
FS
dB
FA
FA
I
FA
ns
ns
V
www.maximintegrated.com
Maxim Integrated │2


Part Number MAX16840
Description LED Driver
Maker Maxim Integrated Products
PDF Download

MAX16840 Datasheet PDF






Similar Datasheet

1 MAX1684 Low-Noise / 14V Input / 1A / PWM Step-Down Converters
Maxim
2 MAX16840 LED Driver
Maxim Integrated Products
3 MAX16841 Controller IC
Maxim Integrated Products





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy