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PDF MAX16818ETI Data sheet ( Hoja de datos )
| Número de pieza | MAX16818ETI | |
| Descripción | LED Driver | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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MAX16818
EVALUATION KIT AVAILABLE
1.5MHz, 30A High-Efficiency, LED Driver
with Rapid LED Current Pulsing
General Description
The MAX16818 pulse-width modulation (PWM)
LED driver controller provides high-output-current
capability in a compact package with a minimum number
of external components. The MAX16818 is suitable for
use in synchronous and nonsynchronous step-down
(buck) topologies, as well as in boost, buck-boost, SEPIC,
and Cuk LED drivers. The MAX16818 is the first LED
driver controller that enables Maxim’s technology for
fast LED current transients of up to 20A/µs and 30kHz
dimming frequency.
This device utilizes average-current-mode control that
enables optimal use of MOSFETs with optimal charge and
on-resistance characteristics. This results in the minimized
need for external heatsinking even when delivering up
to 30A of LED current. True differential sensing enables
accurate control of the LED current. A wide dimming range
is easily implemented to accommodate an external PWM
signal. An internal regulator enables operation over a wide
input voltage range: 4.75V to 5.5V or 7V to 28V and above
with a simple external biasing device. The wide switching
frequency range, up to 1.5MHz, allows for the use of small
inductors and capacitors.
The MAX16818 features a clock output with 180° phase
delay to control a second out-of-phase LED driver to
reduce input and output filter capacitors size or to mini-
mize ripple currents. The MAX16818 offers programmable
hiccup, overvoltage, and overtemperature protection.
The MAX16818ETI+ is rated for the extended tempera-
ture range (-40°C to +85°C) and the MAX16818ATI+ is
rated for the automotive temperature range (-40°C to
+125°C). This LED driver controller is available in a lead-
free, 0.8mm high, 5mm x 5mm 28-pin TQFN package with
an exposed pad.
Applications
●● Front Projectors/Rear Projection TVs
●● Portable and Pocket Projectors
●● LCD TVs and Display Backlight
Package Information appears at end of data sheet.
Benefits and Features
●● Flexible Architecture Supports a Range of LED
LIghting Applications with Minimal Component Count
• Up to 30A Output Current
• 4.75V to 5.5V or 7V to 28V Input Voltage Range
• Average-Current-Mode Control
• True-Differential Remote-Sense Input
●● Frequency Management Reduces EMI and
Interference with Other System Clocks
• Programmable Switching Frequency or External
Synchronization from 125kHz to 1.5MHz
• Clock Output for 180° Out-of-Phase Operation
●● Integrated Protection Features and Thermally
Enhanced Package Improve System Reliability
• Output Overvoltage and Hiccup-Mode Overcurrent
Protection
• Thermal Shutdown
• Thermally Enhanced 28-Pin TQFN Package
Ordering Information
PART
MAX16818ATI+
TEMP RANGE
-40°C to +125°C
PIN-PACKAGE
28 TQFN-EP*
MAX16818ETI+
-40°C to +85°C
28 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Simplified Diagram
7V TO 28V
IN
EN
ILIM
Q1
DH
MAX16818
Q2
DL
OVI CSP
CLP PGND
C1
VLED
L1
C2
Q3
R1
HIGH-FREQUENCY
PULSE TRAIN
NOTE: MAXIM TOPOLOGY
19-0666; Rev 4; 5/15
1 page  
MAX16818
1.5MHz, 30A High-Efficiency, LED Driver
with Rapid LED Current Pulsing
Typical Operating Characteristics
(TA = +25°C, using Figure 5, unless otherwise noted.)
SUPPLY CURRENT (IQ) vs. FREQUENCY
60
EXTERNAL CLOCK
NO DRIVER LOAD
50
VIN = 24V
40
30 VIN = 12V
20
VIN = 5V
10
0
100 300 500 700 900 1100 1300 1500
FREQUENCY (kHz)
HICCUP CURRENT LIMIT vs. REXT
26.0
25.5
25.0
24.5
24.0
VIN = 12V
23.5 fSW = 250kHz
R1 = 1mΩ
VOUT = 1.5V
23.0
04
8
12 16 20
REXT (MΩ)
DRIVER FALL TIME
vs. DRIVER LOAD CAPACITANCE
100
VIN = 12V
fSW = 250kHz
80
60
DL
40
DH
20
0
1 6 11 16 21
CAPACITANCE (nF)
SUPPLY CURRENT vs. TEMPERATURE
70
68
66
64
62 VIN = 12V
fSW = 250kHz
CDL/CDH = 22nF
60
-40 -15 10
35
TEMPERATURE (°C)
60
85
VCC LOAD REGULATION
vs. INPUT VOLTAGE
5.25
5.15
VIN = 24V
5.05 VIN = 12V
4.95
VIN = 5V
4.85
4.75
0
25 50 75 100 125 150
VCC LOAD CURRENT (mA)
HIGH-SIDE DRIVER (DH) SINK
AND SOURCE CURRENT
MAX16818 toc08
CLOAD = 22nF
VIN = 12V
CURRENT-SENSE THRESHOLD
vs. OUTPUT VOLTAGE
29.0
28.5
28.0
27.5
27.0
26.5
VIN = 12V
fSW = 250kHz
26.0
012345
VOUT (V)
DRIVER RISE TIME
vs. DRIVER LOAD CAPACITANCE
100
VIN = 12V
fSW = 250kHz
80
60
DL
40
DH
20
0
1 6 11 16 21
CAPACITANCE (nF)
LOW-SIDE DRIVER (DL) SINK
AND SOURCE CURRENT
MAX16818 toc09
CLOAD = 22nF
VIN = 12V
2A/div
3A/div
100ns/div
100ns/div
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX16818
1.5MHz, 30A High-Efficiency, LED Driver
with Rapid LED Current Pulsing
Typical Application Circuits (continued)
VLED
R3
R4
C4
R5
ON/OFF
R6
VCC
C11
C10 R12
R11
C9
C8
R10
14
LIM
15 OVI
13 12 11
V_IOUT RT/SYNC EN
10 9
PGOOD CLKOUT
8
SGND
N.C. 7
16 CLP
DH 6
17 EAOUT
LX 5
18 EAN
MAX16818
BST 4
19 DIFF
DL 3
20 CSN
N.C. 2
21 CSP
SGND
22
SENSE- SENSE+ SGND
23 24 25
IN
26
VCC
27
VCC
PGND
VDD
28
1
VIN
7V TO 28V
C3
L1
C1 D1
Q1
VLED
L2
C2
LED
STRING
R7
R1
R2
VIN
C7 C6
R8
C5
Figure 3. Typical Application Circuit for a SEPIC LED Driver
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
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| PDF Descargar | [ Datasheet MAX16818ETI.PDF ] | |
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