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LT3759HMSE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P32
LT3759
1
3759fc
For more information www.linear.com/3759
TYPICAL APPLICATION
FEATURES DESCRIPTION
Wide Input Voltage Range
Boost/SEPIC/Inverting
Controller
2.5V to 36V Input, 12V Output SEPIC Converter
Excellent for Automotive 12V Post Regulator
APPLICATIONS
n
Wide V
IN
Range: 1.6V to 42V
n
Positive or Negative Output Voltage Programming
with a Single Feedback Pin
n
PGOOD Output Voltage Status Report
n
Accurate 50mV SENSE Threshold Voltage
n
Programmable Soft-Start
n
Programmable Operating Frequency (100kHz to 1MHz)
with One External Resistor
n
Synchronizable to an External Clock
n
Low Shutdown Current < 1µA
n
INTV
CC
Regulator Supplied from V
IN
or DRIVE
n
Programmable Input Undervoltage Lockout with
Hysteresis
n
Datacom and Industrial Boost, SEPIC and Inverting
Converters
n
Distributed Power Supplies
n
Portable Electronic Equipment
n
Automotive
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT and No R
SENSE
are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners. Protected by U.S. Patents including 7825665.
The LT
®
3759 is a wide input range, current mode, DC/DC
controller which is capable of regulating either positive or
negative output voltages from a single feedback pin. It can
be configured as a boost, SEPIC or inverting converter.
The LT3759 drives a low side external N-channel power
MOSFET. An internal LDO regulator draws power from
V
IN
or DRIVE to provide up to a 4.75V supply for the gate
driver. The fixed frequency, current-mode architecture
results in stable operation over a wide range of supply
and output voltages. The operating frequency of LT3759
can be set over a 100kHz to 1MHz range with an external
resistor, or can be synchronized to an external clock using
the SYNC pin.
The LT3759 features soft-start and frequency foldback
functions to limit inductor current during start-up and
output short-circuit. A window comparator on the FBX pin
reports via the PGOOD pin, providing output voltage status
indication. The device is available in a 12-Lead exposed
pad MSOP package.
Efficiency vs Output Current
OUTPUT CURRENT (A)
0
EFFICIENCY (%)
90
95
100
1.5 2.5
3759 TA01b
85
0.5 1
2
80
75
V
IN
= 12V
LT3759
V
IN
V
IN
2.5V TO
36V
C
IN
4.7µF
×4
41.2k
200kHz
4.7µF ×2
GATE
SENSE
DRIVE
FBX
GND
INTV
CC
EN/UVLO
PGOOD
SYNC
TIE TO GND
IF NOT USED
RT
SS
VC
L1A
L1B
105k
118k
0.1µF
7.5k
22nF
105K
5mΩ
100k
4.7µF
V
OUT
12V
0.5A, 2.5V ≤ V
IN
≤ 8V
2A, 8V < V
IN
≤ 36V
3759 TA01a
C
OUT2
47µF
×4
M1
15.8K
+
C
OUT1
10µF
LT3759
2
3759fc
For more information www.linear.com/3759
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
V
IN
............................................................................42V
EN/UVLO (Note 2)
..................................................... 42V
DRIVE
.......................................................................42V
PGOOD
...................................................................... 42V
INTV
CC
........................................................................8V
GATE
..................................................................(Note 3)
SYNC
..........................................................................8V
VC, SS
......................................................................... 3V
(Note 1)
1
2
3
4
5
6
VC
FBX
SS
RT
SYNC
PGOOD
12
11
10
9
8
7
EN/UVLO
V
IN
DRIVE
INTV
CC
GATE
SENSE
TOP VIEW
MSE PACKAGE
12-LEAD PLASTIC MSOP
13
GND
θ
JA
= 35°C/W TO 40°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3759EMSE#PBF LT3759EMSE#TRPBF 3759 12-Lead Plastic MSOP –40°C to 125°C
LT3759IMSE#PBF LT3759IMSE#TRPBF 3759 12-Lead Plastic MSOP –40°C to 125°C
LT3759HMSE#PBF LT3759HMSE#TRPBF 3759 12-Lead Plastic MSOP –40°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. Consult LTC Marketing for information on non-standard lead based finish parts.
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/
RT ............................................................................1.5V
SENSE
.................................................................... ±0.3V
FBX
................................................................. –3V to 3V
Operating Junction Temperature Range (Note 4)
LT3759E/LT3759I .............................. –40°C to 125°C
LT3759H ............................................ –40°C to 150°C
Storage Temperature Range
.................. –65°C to 150°C
LT3759
3
3759fc
For more information www.linear.com/3759
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Voltage
l
1.6 42 V
V
IN
Shutdown I
Q
EN/UVLO < 0.4V
EN/UVLO = 1.15V
0.1 1
6
µA
µA
V
IN
Operating I
Q
350 450 µA
DRIVE Shutdown Quiescent Current EN/UVLO < 0.4V
EN/UVLO = 1.15V
0.1
0.1
1
2
µA
µA
DRIVE Quiescent Current (Not Switching) R
T
= 27.4kΩ, DRIVE = 6V 2.0 2.5 mA
SENSE Current Limit Threshold
l
46 50 54 mV
SENSE Input Bias Current Current Out of Pin –55 µA
Error Amplifier
FBX Regulation Voltage (V
FBX(REG)
) FBX > 0V
FBX < 0V
l
l
1.580
–0.815
1.6
–0.80
1.620
–0.785
V
V
FBX Pin Input Current FBX = 1.6V
FBX = –0.8V
–10
60 120
10
nA
nA
Transconductance g
m
(ΔI
2
/ΔV
FBX
) FBX = V
FBX(REG)
240 µs
VC Output Impedance 5 MΩ
FBX Line Regulation [ΔV
FBX(REG)
/(ΔV
IN
• V
FBX(REG)
)] 1.6V < V
IN
< 42V, FBX >0
1.6V < V
IN
< 42V, FBX <0
0.02
0.02
0.05
0.05
%/V
%/V
VC Current Mode Gain (ΔV
VC
/ΔV
SENSE
) 5 V/V
VC Source Current FBX = 0V, VC = 1.3V –13 µA
VC Sink Current FBX = 1.7V, VC = 1.3V
FBX = –0.85V, VC = 1.3V
13
10
µA
µA
Oscillator
Switching Frequency R
T
= 27.4k to GND, V
FBX
= 1.6V
R
T
= 86.6k to GND, V
FBX
= 1.6V
R
T
= 6.81k to GND, V
FBX
= 1.6V
270 300
100
1000
330 kHz
kHz
kHz
R
T
Voltage FBX = 1.6V, –0.8V 1.2 V
GATE Minimum Off-Time 170 200 ns
GATE Minimum On-Time 170 200 ns
SYNC Input Low
l
0.4 V
SYNC Input High
l
1.5 V
SS Pull-Up Current SS = 0V, Current Out of Pin
l
–14 –10.5 –7 µA
Low Dropout Regulators (DRIVE LDO and V
IN
LDO)
DRIVE LDO Regulation Voltage DRIVE = 6V
l
4.6 4.75 4.9 V
V
IN
LDO Regulation Voltage DRIVE = 0V
l
3.6 3.75 3.9 V
DRIVE LDO Current Limit INTV
CC
= 4V 60 mA
V
IN
LDO Current Limit DRIVE = 0V, INTV
CC
= 3V 60 mA
DRIVE LDO Load Regulation (ΔV
INTVCC
/V
INTVCC
) 0 < I
INTVCC
< 20mA, DRIVE = 6V –1 –0.6 %
V
IN
LDO Load Regulation (ΔV
INTVCC
/V
INTVCC
) DRIVE = 0V, 0 < I
INTVCC
< 20mA –1 –0.6 %
DRIVE LDO Line Regulation [ΔV
INTVCC
/(V
INTVCC
• ΔV
IN
)] 1.6V < V
IN
< 42V, DRIVE = 6V 0.03 0.07 %/V
V
IN
LDO Line Regulation [ΔV
INTVCC
/(V
INTVCC
• ΔV
IN
)] DRIVE = 0V, 5V < V
IN
< 42V 0.03 0.07 %/V
DRIVE LDO Dropout Voltage (V
DRIVE
– V
INTVcc
) DRIVE = 4V, I
INTVCC
= 20mA
l
190 400 mV
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 12V, EN/UVLO = 12V, INTV
CC
= 4.75V, unless otherwise noted.
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LT3759HMSE#PBF

Mfr. #:
Buy LT3759HMSE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Boost, Flyback, SEPIC, and Inverting Controller
Lifecycle:
New from this manufacturer.
Delivery:
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