LTM8005
38V
IN
Boost µModule Regulator for
LED Drive with 10A Switch
FEATURES
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DESCRIPTION
The
LTM
®
8005
is a 38V
IN
, 38V
OUT
boost µModule (power
micromodule) LED driver designed to regulate current or
voltage and is ideal for driving LEDs. The fixed frequency
and current mode architecture result in stable operation
over a wide range of supply and output voltages. Spread
spectrum frequency modulation (SSFM) can be activated
for improved electromagnetic compatibility (EMC) perfor-
mance. The ground-referred voltage FB pin serves as the
input for several LED protection features, and also allows the
converter to operate as a constant voltage source. The PWM
input provides LED dimming ratios of up to 3000:1, and the
CTRL inputs provide additional analog dimming capability.
The low profile package enables utilization of unused
space on the bottom of PC boards. The LTM8005 is pack-
aged in thermally enhanced, compact over-molded Ball
Grid Array (BGA) package suitable for automated assem-
bly by standard surface mount equipment. The LTM8005
is RoHS compliant.
All registered trademarks and trademarks are the property of their respective owners.
Wide Input Voltage Range: 5V to 38V
Supports Boost or SEPIC Power Topologies
Adjustable LED Current Up to 1.6A
40V 10A Internal Power Switch
Wide Temperature Range: –40°C to 150°C
Input and Output Current Reporting
Internal Switch for PWM and Output Disconnect
Internal Spread Spectrum Frequency Modulation
3000:1 True Color PWM™ Dimming
Open LED Protection with OPENLED Flag
Short-Circuit Protection and SHORTLED Flag
Soft-Start with Programmable Fault Restart Timer
9mm × 11.25mm × 2.22mm BGA
APPLICATIONS
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High Power LED, High Voltage LED
Accurate Current-Limited Voltage Regulators
TYPICAL APPLICATION
350mA at 30.5V to 35.5V LED String from 6V to 27V V
IN
(Boost) with Spread Spectrum
V
IN
6V TO 27V
1M
C
IN
2×
4.7µF
50V
EN/UVLO
93.1k
OVLO
19.1k
LTM8005
PWM
V
REF
CTRL1
100k
CTRL2
18.7k
L: COILCRAFT XAL7030-822ME
C
IN
, C
OUT
: MURATA GRM31CR71H475KA12
PIN NOT USED IN THIS CIRCUIT: IVINCOMP
SS
0.1µF
VC
4.7k
10nF
RT
GND
23.2k
f = 350kHz
FB
ISMON
OPENLED SHORTLED RAMP
6.8nF
0.1µF
12.4k
ISN
LED
AUX
374k
LED
STRING
V
OUT
C
OUT
2×
4.7µF
50V
V
IN
IVINP IVINN
L
8.2µH
SW
DA
8005 TA01a
Document Feedback
For more information
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1
Rev A
LTM8005
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
OPENLED
SHORTLED
RAMP
TOP VIEW
V
IN
, EN/UVLO, IVINN, IVINP .....................................50V
ISN Above LED..........................................................40V
SW, ISN, LED, V
OUT
, VOUT-DA ..................................40V
SW, ISN, LED, V
OUT
, V
OUT
– D
A
................. 45V Transient
CTRL1, CTRL2 ………………. ..................................15V
PWM, SHORTLED, OPENLED ...................................12V
FB, OVLO ....................................................................8V
Maximum Junction Temperature
(E-Grade, I-Grade, MP-Grade) .......................... 125°C
Maximum Junction Temperature (H-Grade) .......... 150°C
Storage Temperature............................................. 150°C
Peak Solder Reflow Body Temperature ................. 260°C
8
BANK 4 V
OUT
7
ISN
6
BANK 3 DA
5
BANK 1
4
BANK 2
3
SW
2
1
A
B
C
D
E
V
IN
EN/UVLO
F
ISMON
IVINN IVINP
AUX
GND
LED
V
REF
BANK 5 BANK 6
PWM
GND
CTRL2
CTRL1
RT
SS
VC
FB
GND
H
J
IVINCOMP
K
G
OVLO
BGA PACKAGE
80-Pad (11.25mm
×
9mm
×
2.22mm)
θ
JA
= 19.3°C/W,
θ
JCBOTTOM
= 3.0°C/W,
θ
JCTOP
= 16.3°C/W,
θ
JB
= 7.2°C/W, WEIGHT = 0.4g
θ
VALUES DETERMINED PER JEDEC 15-9, 51-12
ORDER INFORMATION
Part Number
LTM8005EY#PBF
LTM8005IY#PBF
LTM8005HY#PBF
Terminal Finish
SAC305 (RoHS)
SAC305 (RoHS)
SAC305 (RoHS)
Part Marking*
Device
LTM8005
LTM8005
LTM8005
Finish Code
e1
e1
e1
Package Type
BGA
BGA
BGA
MSL Rating
3
3
3
Temperature Range
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
Contact the factory for parts specified with wider operating temperature
ranges. *Device temperature grade is identified by a label on the shipping
container. Pad or ball finish code is per IPC/JEDEC J-STD-609.
•
Recommended LGA and BGA PCB Assembly and Manufacturing
Procedures
•
LGA and BGA Package and Tray Drawings
2
Rev A
For more information
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LTM8005
The
l
denotes the specifications which apply over the specified operating
temperature range, otherwise specifications are at T
A
= 25°C. CTRL1 = CTRL2 = PWM = 5V, unless otherwise noted (Note 2).
PARAMETER
Minimum Input Voltage
LED DC Current
CTRL1 = 1.5V
CTRL1 = 0.6V
CTRL1 = 0.2V
10
I
LED
= 1.5A
EN/UVLO = 0V (Disabled), PWM = 0V
EN/UVLO = 1.15V, PWM = 0V
RT = 82.5K to GND, FB = 1.5V (Not Switching)
I
REF
= –100µA
5V < V
IN
< 48V
–100µA < I
REF
< 0µA
Sourcing, SS = 0V
Sinking, I
LED
Overcurrent
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
l
MIN
TYP
1.65
0.8
0.16
12
19
MAX
5
UNITS
V
A
A
A
SW Current Limit
SW R
DS(ON)
ISMON Voltage
Quiescent Current into V
IN
V
REF
Voltage
V
REF
Line Regulation
V
REF
Load Regulation
SS Current
I
LED
Overcurrent Threshold
ISN-LED R
DS(ON)
VC Output Impedance
VC Standby Input Bias Current
VC Pin Current
Voltage at FB pin
FB Amplifier g
m
FB Pin Input Bias Current
FB OPENLED Threshold
FB Overvoltage Threshold
FB SHORTLED Threshold
LED Current C/10 Threshold
Input Current Limit Threshold
IVINCOMP Voltage
Switching Frequency
IVINP – IVINN
IVINP – IVINN = 60mV
RT = 82.5k
RT = 26.1k
RT = 6.65k
RAMP = 2V
SHORTLED Falling
Current Out of Pin, FB = V
FB
OPENLED Falling
PWM = 0V
VC = 1.2V, Sourcing
VC = 1.2V, Sinking
l
14
0.96
35
40
3.5
A
mΩ
V
µA
µA
mA
V
%
%
µA
µA
A
mΩ
kΩ
0.88
1.95
2.00
0.1
1
28
2.8
2.4
53
2000
2.08
–20
10
30
1.23
1.25
500
20
nA
µA
µA
1.27
200
V
µS
nA
V
V
mV
A
mV
V
kHz
kHz
kHz
%
V
V
µA
µA
1.176
1.26
300
0.16
53
1.2
85
240
800
105
300
1000
70
1
2
1.222
1.34
350
67
125
360
1200
Switching Frequency Modulation
RAMP Input Low Threshold
RAMP Input High Threshold
RAMP Pin Source Current
RAMP Pin Sink Current
CTRL1, CTRL2 Pin Current
PWM Input Threshold Rising
PWM Pin Bias Current
RAMP = 0.4V
RAMP = 1.6V
CTRL1, CTRL2 = 1V
12
12
200
1
10
nA
V
µA
For more information
www.analog.com
3
Rev A
LTM8005
The
l
denotes the specifications which apply over the specified operating
temperature range, otherwise specifications are at T
A
= 25°C. CTRL1 = CTRL2 = PWM = 5V, unless otherwise noted (Note 2).
PARAMETER
EN/UVLO Threshold Voltage Falling
EN/UVLO Threshold Voltage Rising
EN/UVLO Pin Bias Current
OPENLED Output Low
SHORTLED Output Low
OVLO Threshold Voltage
EN/UVLO = 1.15V, V
IN
= 12V
I
OPENLED
= 0.5mA
I
SHORTLED
= 0.5mA
Rising
Falling
1.21
1.17
CONDITIONS
MIN
TYP
1.22
1.24
19
0.3
0.3
1.30
1.26
MAX
UNITS
V
V
µA
V
V
V
V
ELECTRICAL CHARACTERISTICS
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LTM8005E is guaranteed to meet performance specifications
from 0°C to 125°C internal. Specifications over the full –40°C to
125°C internal operating temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTM8005I is guaranteed to meet specifications over the full –40°C
to 125°C internal operating temperature range. The LTM8005MP is
guaranteed to meet specifications over the full –55°C to 125°C internal
operating temperature range. The LTM8005H is guaranteed to meet
specifications over the full –40°C to 150°C internal operating temperature
range. Note that the maximum internal temperature is determined by
specific operating conditions in conjunction with board layout, the rated
package thermal resistance and other environmental factors.
Note 3:
The LTM8005 contains over-temperature protection that is
intended to protect the device during momentary overload conditions. The
internal temperature exceeds the maximum operating junction temperature
when the over-temperature protection is active. Continuous operation
above the specified maximum operating junction temperature may impair
device reliability.
4
Rev A
For more information
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LTM8005
TYPICAL PERFORMANCE CHARACTERISTICS
LED Current vs CTRL1
2.0
2.0
T
A
= 25°C, unless otherwise noted.
LED Current vs FB
(CTRL1 = CTRL2 = V
REF
)
LED Current vs CTRL2
2.0
1.6
LED CURRENT (A)
LED CURRENT (A)
1.6
LED CURRENT (A)
0
0.25
0.50 0.75
1
CTRL2 VOLTAGE (V)
1.25
1.50
8005 G02
1.5
1.2
1.2
1.0
0.8
0.8
0.4
0.4
0.5
0
0
0.25
0.50 0.75
1
CTRL1 VOLTAGE (V)
1.25
1.50
8005 G01
0
0
0
0.3
0.6
0.9
V
FB
(V)
1.2
1.5
8005 G03
2.5
V
REF
vs Load
VREF vs Load Current
Switching Frequency
vs SS Voltage
350
R
T
= 23.2k
2.0
FREQUENCY (kHz)
0
45
90
135
LOAD CURRENT (µA)
180
8005 G04
280
V
REF
(V)
1.5
210
1.0
140
0.5
70
0
0
0
0.3
0.6
0.9
V
SS
(V)
1.2
1.5
8005 G05
Demonstration Circuit DC2257A
Output Current Ripple 34V at 1.2A
LED, 12V
IN
100
DC2257A Conducted EMI with and
without Spread Spectrum Enabled
SPREAD SPECTRUM DISABLED
SPREAD SPECTRUM ENABLED
C
RAMP
= 22nF
80
CURRENT RIPPLE
50mA/DIV
EMISSIONS (dBµV)
1µs/DIV
8005 G06
60
41
21
1
0.1
1.1
2.1
3.0
FREQUENCY (MHz)
4.0
5.0
8005 G07
For more information
www.analog.com
5
Rev A
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