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VIN
CDHC
LM3492HC
LM3492HC-Q1
VCC
EN
SW
RT
VOUT
FB
PGND
GND
COMM
DIM1/CLK
DIM2
IREF
ILIM
LGND
IOUT1
IOUT2
R
RT
L1
C
FB
R
FB1
C
OUT
R
FB2
R
IREF
C
VCC
R
COMM
C
CDHC
C
IN
Product
Folder
Sample &
Buy
Technical
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Tools &
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Support &
Community
LM3492HC-Q1,LM3492HC
SNVS797B –MARCH2012–REVISED OCTOBER 2015
LM3492HC/-Q1Two-Channel, Individual Dimmable, LEDDriver
WithBoost ConverterandFast Current Regulator
1 Features
2 Applications
1
• Boost Converter
• Ultra-High Contrast Ratio 6.5” to 10” LCD Display
Backlight up to 28 LEDs
– Automotive Grade Product, Q100 Grade-1
• Automotive or Marine GPS Display
Qualified
– Very Wide Input Voltage Range: 4.5 V to 65 V
3 Description
– Programmable Soft-Start Period
The LM3492HC/-Q1 device integrates a boost
– No Loop Compensation Required
converter and a two-channel current regulator to
– Stable with Ceramic and Other Low ESR
implement a highly efficient and cost effective LED
Capacitors with No Audible Noise
driver. This device drives two individually dimmable
LED strings with a maximum power of 15 W and an
– Nearly Constant Switching Frequency
output voltage of up to 65 V. The boost converter
Programmable from 200 kHz to 1 MHz
employs a proprietary projected-on-time control
• Current Regulator
method to give a fast transient response with no
– Programmable LED Current: 50 mA to 250 mA
compensation
required. The
nearly
constant
switching frequency can be set to a level from 200
– 10000:1 Contrast Ratio, 300-ns Minimum
kHz to 1 MHz. Ceramic capacitors stabilize the
Pulse Width
application circuit and produce no audible noise on
– Two Individual Dimmable LED Strings up to
dimming. The programmable peak current limit and
65 V, Total 15 W (Typically 28 LEDs at
soft-start features reduce current surges at start-up.
150 mA)
An integrated, 190-m
, 3.9-A, N-Channel MOSFET
switch minimizes the solution size. The fast slew rate
– Dynamic Headroom Control Maximizes
current regulator allows high frequency and narrow
Efficiency
pulse width dimming signals to achieve a very high
– Over-Power Protection
contrast ratio of 10000:1. The LED current can be set
– ±3% Current Accuracy
from 50 mA to 250 mA by a single resistor.
• Supervisory Functions
Device Information
(1)
– Precision Enable
PART NUMBER
PACKAGE
BODY SIZE (NOM)
– COMM I/O Pin for Diagnostic and Commands
LM3492HC
PWP (20)
6.50 mm × 4.40 mm
– Thermal Shutdown Protection
LM3492HC-Q1
– Thermally Enhanced PWP, 20-Pin Package
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Application
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectualpropertymattersand other important disclaimers. PRODUCTION DATA.
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LM3492HC-Q1,LM3492HC
SNVS797B–MARCH2012–REVISEDOCTOBER2015
www.ti.com
Table of Contents
8.4 Device FunctionalModes........................................17
1
Features..................................................................1
8.5 Programming ..........................................................18
2
Applications...........................................................1
9
Applicationand Implementation........................19
3
Description.............................................................1
9.1 Application Information............................................19
4
Revision History.....................................................2
9.2 TypicalApplication .................................................19
5
Description (continued).........................................3
10 Power Supply Recommendations.....................22
6
Pin Configuration and Functions.........................3
11 Layout...................................................................22
7
Specifications.........................................................4
11.1 Layout Guidelines.................................................22
7.1 Absolute Maximum Ratings......................................4
11.2 Layout Example....................................................22
7.2 ESD Ratings..............................................................4
12 Device and Documentation Support.................23
7.3 Recommended Operating Conditions.......................4
12.1 Related Links........................................................23
7.4 Thermal Information..................................................5
12.2 CommunityResources..........................................23
7.5 Electrical Characteristics...........................................5
12.3 Trademarks...........................................................23
7.6 TypicalCharacteristics..............................................7
12.4 Electrostatic Discharge Caution............................23
8
Detailed Description............................................11
12.5 Glossary................................................................23
8.1 Overview.................................................................11
13 Mechanical, Packaging, and Orderable
8.2 Functional Block Diagram.......................................11
Information...........................................................23
8.3 Feature Description.................................................12
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (May 2013) toRevision B
Page
• AddedPinConfigurationandFunctionssection,ESDRating table,FeatureDescriptionsection,DeviceFunctional
Modes, Application and Implementationsection,Power Supply Recommendationssection,Layoutsection,Device
and Documentation Supportsection,and Mechanical, Packaging, and Orderable Informationsection ..............................1
2
Submit Documentation Feedback
Copyright© 2012–2015, Texas InstrumentsIncorporated
Product Folder Links:LM3492HC-Q1 LM3492HC
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1
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5
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8
9
10
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19
18
17
16
15
14
13
12
11
EN
VIN
SW
SW
VOUT
RT
FB
GND
IOUT2
IOUT1
ILIM
VCC
PGND
PGND
DIM2
DIM1/CLK
LGND
COMM
IREF
CDHC
NC – No internal connection
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T
10
15
20
25
70
75
80
85
90
95
100
EFFICIENCY (%)
INPUT VOLTAGE (V)
125°C
25°C
-40°C
10
15
20
25
-1.00
-0.75
-0.50
-0.25
0.00
0.25
0.50
0.75
1.00
ûILED(%)
INPUT VOLTAGE (V)
125°C
-40°C
25°C
LM3492HC-Q1,LM3492HC
SNVS797B–MARCH2012–REVISEDOCTOBER2015
www.ti.com
Typical Characteristics (continued)
Unless otherwise specified the following conditions apply: T
J
=25°C, V
IN
=12 V with configuration in typical application circuit
for I
LED
=250 mA shown in this data sheet.
Figure 5. LED Current Regulation vs Temperature
Figure 6. MOSFET On-Resistance vs Temperature
I
LED
=0.25 A
I
LED
=0.25 A
Figure 7. Efficiency vs InputVoltage
Figure 8. LED CurrentRegulation vs Input Voltage
I
LED
=0.25 A
I
LED
=0.25 A
Figure 9. Power-Up Waveform
Figure 10. Enable Transient Waveform
8
Submit Documentation Feedback
Copyright© 2012–2015, Texas InstrumentsIncorporated
Product Folder Links:LM3492HC-Q1 LM3492HC
Input Voltage (V)
Switching Frequency (kHz)
6
8
10
12
14
16
18
20
22
24
26
200
250
300
350
400
450
500
550
600
650
700
750
800
D001
V
OUT
= 27V
V
OUT
= 30V
V
OUT
= 33V
V
OUT
= 36V
Input Voltage (V)
Switching Frequency (kHz)
6
8
10
12
14
16
18
20
22
24
160
180
200
220
240
260
280
300
320
D001
V
OUT
= 27V
V
OUT
= 30V
V
OUT
= 33V
V
OUT
= 36V
LM3492HC-Q1,LM3492HC
www.ti.com
SNVS797B –MARCH 2012–REVISED OCTOBER 2015
Typical Characteristics (continued)
Unless otherwise specified the following conditions apply: T
J
=25°C, V
IN
=12 V with configuration in typical application circuit
for I
LED
=250 mA shown in this data sheet.
I
LED
=0.25 A
Dimming frequency = 200 Hz
Figure 12. LED 50% Dimming Waveforms
Figure 11. Steady-State Operation
I
LED
=0.25 A
Dimming frequency = 200 Hz
I
LED
=0.25 A
Dimming frequency = 200 Hz
Figure 14. 10000:1 LED Dimming Waveforms
Figure 13. 1000:1 LED Dimming Waveforms
I
LED
=0.15 A
R
RT
=178 k
I
LED
=0.15 A
R
RT
=499 k
Figure 15. Switching Frequency vs Input Voltage
Figure 16. Switching Frequency vs Input Voltage
Copyright ©2012–2015,Texas InstrumentsIncorporated
Submit Documentation Feedback
9
Product Folder Links:LM3492HC-Q1 LM3492HC
Output Voltage (V)
Switching Frequency (kHz)
24
26
28
30
32
34
36
38
40
560
580
600
620
640
660
680
700
720
740
760
D001
V
IN
= 10V
V
IN
= 12V
V
IN
= 14V
V
IN
= 16V
Output Voltage (V)
Switching Frequency (kHz)
24
26
28
30
32
34
36
38
40
240
245
250
255
260
265
270
275
280
285
290
295
300
D001
V
IN
= 10V
V
IN
= 12V
V
IN
= 14V
V
IN
= 16V
LM3492HC-Q1,LM3492HC
SNVS797B–MARCH2012–REVISEDOCTOBER2015
www.ti.com
Typical Characteristics (continued)
Unless otherwise specified the following conditions apply: T
J
=25°C, V
IN
=12 V with configuration in typical application circuit
for I
LED
=250 mA shown in this data sheet.
I
LED
=0.15 A
R
RT
=178 k
I
LED
=0.15 A
R
RT
=499 k
Figure 17. Switching Frequency vs OutputVoltage
Figure 18. Switching Frequency vs OutputVoltage
10
Submit Documentation Feedback
Copyright© 2012–2015, Texas InstrumentsIncorporated
Product Folder Links:LM3492HC-Q1 LM3492HC
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