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LT3791IFE#PBF

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LT3791
1
3791fb
For more information www.linear.com/LT3791
Typical applicaTion
FeaTures DescripTion
60V 4-Switch Synchronous
Buck-Boost LED Driver
Controller
The LT
®
3791 is a synchronous 4-switch buck-boost LED
driver controller. The controller can regulate LED current
up to 52V of LED string with input voltages above, below,
or equal to the output voltage. The constant-frequency,
forced-continuous current mode architecture allows its
frequency to be adjusted or synchronized from 200kHz to
700kHz. No top MOSFET refresh switching cycle is needed
in buck or boost operation. With 60V input, 60V output
capability and seamless transitions between operating
regions, the LT3791 is ideal for LED driver applications in
automotive, industrial, and even battery-powered systems.
The LT3791 provides input current monitor, LED current
monitor, and open or shorted LED fault condition, during
which the LT3791 either restarts or latches off.
L, LT , LT C , LT M , Linear Technology and the Linear logo are registered and True Color PWM
is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
98.5% Efficient 100W (33.3V 3A) Buck-Boost LED Driver
applicaTions
n
4-Switch Single Inductor Architecture Allows V
IN
Above, Below or Equal to V
OUT
n
Synchronous Switching: Up to 98.5% Efficiency
n
Wide V
IN
Range: 4.7V to 60V
n
Wide V
OUT
Range: 0V to 60V (52V LED)
n
±6% LED Current Accuracy: 0V ≤ V
LED
< 52V
n
True Color PWM™ and Analog Dimming
n
LED and Input Current Regulation with Current
Monitor Outputs
n
No Top MOSFET Refresh in Buck or Boost
n
V
OUT
Disconnected From V
IN
During Shutdown
n
Open or Shorted LED Fault Protection
n
Capable of 100W or Greater per IC
n
38-Lead TSSOP with Exposed Pad
Efficiency vs V
IN
n
Automotive Head Lamps/Running Lamps
n
General Purpose Lighting
50Ω
0.003Ω
470nF
V
IN
15V TO 58V
INTV
CC
TG1
BG1
SNSP
SNSN
PGND
BST1
BST2
BG2
SW2
TG2
RT
LT3791
SWI
SHORTLED
OPENLED
IVINN
IVINP
INTV
CC
1µF
V
IN
PWM
IVINMON
ISMON
CLKOUT
EN/UVLO
OVLO
200k
V
REF
CTRL
86.6k
300kHz
V
C
SYNCSS SGND
PWMOUT
15.8k
28k
200k
499k
0.1µF
10nF
22nF
3791 TA01a
2.2µF
100V
×5
4.7µF
50V
×5
0.004Ω
ISP
ISN
FB
0.033Ω
0.1µF
0.1µF
10µH
4.7µF
3A, 100W
LED POWER
1M
34.2k
INPUT VOLTAGE (V)
10
EFFICIENCY (%)
96
98
100
50
3791 TA01b
94
92
90
20
30
40
60
BUCK
BOOST
BUCK-BOOST
LT3791
2
3791fb
For more information www.linear.com/LT3791
pin conFiguraTionabsoluTe MaxiMuM raTings
Supply Voltages
Input Supply (V
IN
) ..................................................... 60V
SW1, SW2 ...................................................... –1V to 60V
OPENLED, SHORTLED ...............................................15V
EN/UVLO, IVINP, IVINN, ISP, ISN ..............................60V
INTV
CC
, (BST1-SW1), (BST2-SW2) .............................6V
TEST2, SYNC, RT, CTRL, OVLO, PWM .......................6V
IVINMON, ISMON, FB, SS, V
C
, V
REF
............................ 6V
IVINP-IVINN, ISP-ISN, SNSP-SNSN .......................±0.5V
SNSP, SNSN ........................................................... ±0.3V
Operating Junction Temperature (Notes 2, 3)
LT3791E
/LT3791I ............................... –40°C to 125°C
LT3791H
............................................ –40°C to 150°C
LT3791MP ......................................... –55°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................... 300°C
(Note 1)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
TOP VIEW
FE PACKAGE
38-LEAD PLASTIC TSSOP
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
CTRL
SS
PWM
OPENLED
SHORTLED
V
REF
ISMON
IVINMON
EN/UVLO
IVINP
IVINN
V
IN
INTV
CC
TG1
BST1
SW1
PGND
BG1
BG2
OVLO
FB
V
C
RT
SYNC
CLKOUT
TEST2
PWMOUT
SGND
TEST1
SNSN
SNSP
ISN
ISP
TG2
NC
BST2
SW2
PGND
39
SGND
T
JMAX
= 150°C, θ
JA
= 28°C/W
EXPOSED PAD (PIN 39) IS SGND, MUST BE SOLDERED TO PCB
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 12V, V
EN/UVLO
= 12V unless otherwise noted.
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3791EFE#PBF LT3791EFE#TRPBF LT3791FE 38-Lead Plastic TSSOP –40°C to 125°C
LT3791IFE#PBF LT3791IFE#TRPBF LT3791FE 38-Lead Plastic TSSOP –40°C to 125°C
LT3791HFE#PBF LT3791HFE#TRPBF LT3791FE 38-Lead Plastic TSSOP –40°C to 150°C
LT3791MPFE#PBF LT3791MPFE#TRPBF LT3791FE 38-Lead Plastic TSSOP –55°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input
V
IN
Operating Voltage 4.7 60 V
V
IN
Shutdown I
Q
V
EN/UVLO
= 0V 0.1 1 µA
V
IN
Operating I
Q
(Not Switching) FB = 1.3V, R
T
= 59.0k 3.0 4 mA
LT3791
3
3791fb
For more information www.linear.com/LT3791
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 12V, V
EN/UVLO
= 12V unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Logic Inputs
EN/UVLO Falling Threshold
l
1.16 1.2 1.24 V
EN/UVLO Rising Hysteresis 15 mV
EN/UVLO Input Low Voltage I
VIN
Drops Below 1µA 0.3 V
EN/UVLO Pin Bias Current Low V
EN/UVLO
= 1V 2 3 4 µA
EN/UVLO Pin Bias Current High V
EN/UVLO
= 1.6V 10 100 nA
CTRL Input Bias Current V
CTRL
= 1V 20 50 nA
CTRL Latch-Off Threshold 175 mV
OVLO Rising Shutdown Voltage
l
2.85 3 3.15 V
OVLO Falling Hysteresis 75 mV
Regulation
V
REF
Voltage
l
1.96 2.00 2.04 V
V
REF
Line Regulation 4.7V < V
IN
< 60V 0.002 0.04 %/V
V
(ISP-ISN)
Threshold V
CTRL
= 2V
l
97.5
94
100
100
102.5
106
mV
mV
V
CTRL
= 1100mV
l
87
84
90
90
93
96
mV
mV
V
CTRL
= 700mV
l
47.5
46
50
50
52.5
54
mV
mV
V
CTRL
= 300mV
l
6.5
5
10
10
13.5
15
mV
mV
ISP Bias Current 110 µA
ISN Bias Current 20 µA
LED Current Sense Common Mode Range 0 60 V
LED Current Sense Amplifier g
m
890 µS
ISMON Monitor Voltage V
(ISP-ISN)
= 100mV
l
0.96 1 1.04 V
Input Current Sense Threshold V
(IVINP-IVINN)
3V ≤ V
IVINP
≤ 60V
l
46.5 50 54 mV
IVINP Bias Current 90 µA
IVINN Bias Current 20 µA
Input Current Sense Common Mode Range 3 60 V
Input Current Sense Amplifier g
m
2.12 mS
IVINMON Monitor Voltage V
(IVINP-IVINN)
= 50mV
l
0.96 1 1.04 V
FB Regulation Voltage
l
1.194
1.176
1.2
1.2
1.206
1.220
V
V
FB Line Regulation 4.7V < V
IN
< 60V 0.002 0.025 %/V
FB Amplifier g
m
565 µS
FB Pin Input Bias Current FB in Regulation 100 150 nA
V
C
Standby Input Bias Current PWM = 0V –20 20 nA
V
SENSE(MAX)
(V
SNSP-SNSN
) Boost
Buck
l
l
42
–56
51
–47.5
60
–39
mV
mV
Fault
SS Pull-Up Current V
SS
= 0V 14 µA
SS Discharge Current 1.4 µA
FB Overvoltage Rising Threshold 1.22 1.25 V
Open LED Rising Threshold (V
FB
) V
(ISP-ISN)
= 0V
l
1.127 1.15 1.173 V
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LT3791IFE#PBF

Mfr. #:
Buy LT3791IFE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LED Lighting Drivers 60V 4-Switch Sync Buck-Boost LED Drvr Cn
Lifecycle:
New from this manufacturer.
Delivery:
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