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LT3757EDD#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36
LT3757/LT3757A
1
3757afd
n
Wide Input Voltage Range: 2.9V to 40V
n
Positive or Negative Output Voltage Programming
with a Single Feedback Pin
n
Current Mode Control Provides Excellent Transient
Response
n
Programmable Operating Frequency (100kHz to
1MHz) with One External Resistor
n
Synchronizable to an External Clock
n
Low Shutdown Current < 1µA
n
Internal 7.2V Low Dropout Voltage Regulator
n
Programmable Input Undervoltage Lockout with
Hysteresis
n
Programmable Soft-Start
n
Small 10-Lead DFN (3mm × 3mm) and Thermally
Enhanced 10-Pin MSOP Packages
Typical applicaTion
DescripTion
Boost, Flyback, SEPIC and
Inverting Controller
The LT
®
3757/LT3757A are wide input range, current
mode, DC/DC controllers which are capable of generating
either positive or negative output voltages. They can be
configured as either a boost, flyback, SEPIC or inverting
converter. The LT3757/LT3757A drive a low side external
N-channel power MOSFET from an internal regulated 7.2V
supply. The fixed frequency, current-mode architecture
results in stable operation over a wide range of supply
and output voltages.
The operating frequency of LT3757/LT3757A can be set
with an external resistor over a 100kHz to 1MHz range,
and can be synchronized to an external clock using the
SYNC pin. A low minimum operating supply voltage of
2.9V, and a low shutdown quiescent current of less than
1µA, make the LT3757/LT3757A ideally suited for battery-
operated systems.
The LT3757/LT3757A feature soft-start and frequency
foldback functions to limit inductor current during start-up
and output short-circuit. The LT3757A has improved load
transient performance compared to the LT3757.
High Efficiency Boost Converter
FeaTures
applicaTions
n
Automotive and Industrial Boost, Flyback, SEPIC and
Inverting Converters
n
Telecom Power Supplies
n
Portable Electronic Equipment
Efficiency
SENSE
LT3757
V
IN
V
IN
8V TO 16V
10µF
25V
X5R
V
OUT
24V
2A
0.01Ω
41.2k
300kHz
GATE
FBX
GND
INTV
CC
SHDN/UVLO
SYNC
RT
SS
V
C
200k
43.2k
0.1µF
22k
6.8nF
10µH
3757 TA01a
226k
16.2k
4.7µF
10V
X5R
10µF
25V
X5R
47µF
35V
×2
+
OUTPUT CURRENT (A)
0.001
EFFICIENCY (%)
30
50
40
60
70
80
90
100
0.01
0.1 1
3757 TA01b
10
V
IN
= 8V
V
IN
= 16V
L, LT , LT C , LT M, Linear Technology, the Linear logo and Burst Mode are registered trademarks
and No R
SENSE
and ThinSOT are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
LT3757/LT3757A
2
3757afd
pin conFiguraTion
absoluTe MaxiMuM raTings
V
IN
, SHDN/UVLO (Note 6) .........................................40V
INTV
CC
....................................................V
IN
+ 0.3V, 20V
GATE ........................................................ INTV
CC
+ 0.3V
SYNC ..........................................................................8V
V
C
, SS .........................................................................3V
RT ............................................................................1.5V
SENSE .................................................................... ±0.3V
FBX ................................................................. –6V to 6V
(Note 1)
TOP VIEW
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
10
9
6
7
8
4
5
11
3
2
1
V
IN
SHDN/UVLO
INTV
CC
GATE
SENSE
V
C
FBX
SS
RT
SYNC
T
JMAX
= 125°C, θ
JA
= 43°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
1
2
3
4
5
V
C
FBX
SS
RT
SYNC
10
9
8
7
6
V
IN
SHDN/UVLO
INTV
CC
GATE
SENSE
TOP VIEW
MSE PACKAGE
10-LEAD PLASTIC MSOP
11
T
JMAX
= 150°C, θ
JA
= 40°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3757EDD#PBF LT3757EDD#TRPBF LDYW
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LT3757IDD#PBF LT3757IDD#TRPBF LDYW
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LT3757EMSE#PBF LT3757EMSE#TRPBF LTDYX
10-Lead (3mm × 3mm) Plastic MSOP
–40°C to 125°C
LT3757IMSE#PBF LT3757IMSE#TRPBF LTDYX
10-Lead (3mm × 3mm) Plastic MSOP
–40°C to 125°C
LT3757HMSE#PBF LT3757HMSE#TRPBF LTDYX
10-Lead (3mm × 3mm) Plastic MSOP
–40°C to 150°C
LT3757MPMSE#PBF LT3757MPMSE#TRPBF LTDYX
10-Lead (3mm × 3mm) Plastic MSOP
–55°C to 150°C
LT3757AEDD#PBF LT3757AEDD#TRPBF LGGR
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LT3757AIDD#PBF LT3757AIDD#TRPBF LGGR
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LT3757AEMSE#PBF LT3757AEMSE#TRPBF LTGGM
10-Lead (3mm × 3mm) Plastic MSOP
–40°C to 125°C
LT3757AIMSE#PBF LT3757AIMSE#TRPBF LTGGM
10-Lead (3mm × 3mm) Plastic MSOP
–40°C to 125°C
LT3757AHMSE#PBF LT3757AHMSE#TRPBF LTGGM
10-Lead (3mm × 3mm) Plastic MSOP
–40°C to 150°C
LT3757AMPMSE#PBF LT3757AMPMSE#TRPBF LTGGM
10-Lead (3mm × 3mm) Plastic MSOP
–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/
Operating Temperature Range (Notes 2, 8)
LT3757E/LT3757AE............................ –40°C to 125°C
LT3757I/LT3757AI ............................. –40°C to 125°C
LT3757H/LT3757AH ........................... –40°C to 150°C
LT3757MP/LT3757AMP ..................... –55°C to 150°C
Storage Temperature Range
DFN .................................................... –65°C to 125°C
MSOP ................................................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSOP ............................................................... 300°C
LT3757/LT3757A
3
3757afd
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating temp-
erature range, otherwise specifications are at T
A
= 25°C. V
IN
= 24V, SHDN/UVLO = 24V, SENSE = 0V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Range 2.9 40 V
V
IN
Shutdown I
Q
SHDN/UVLO = 0V
SHDN/UVLO = 1.15V
0.1 1
6
µA
µA
V
IN
Operating I
Q
V
C
= 0.3V, R
T
= 41.2k 1.6 2.2 mA
V
IN
Operating I
Q
with Internal LDO Disabled V
C
= 0.3V, R
T
= 41.2k, INTV
CC
= 7.5V 280 400 µA
SENSE Current Limit Threshold
l
100 110 120 mV
SENSE Input Bias Current Current Out of Pin –65 µA
Error Amplifier
FBX Regulation Voltage (V
FBX(REG)
) V
FBX
> 0V (Note 3)
V
FBX
< 0V (Note 3)
l
l
1.569
–0.816
1.6
–0.80
1.631
–0.784
V
V
FBX Overvoltage Lockout V
FBX
> 0V (Note 4)
V
FBX
< 0V (Note 4)
6
7
8
11
10
14
%
%
FBX Pin Input Current V
FBX
= 1.6V (Note 3)
V
FBX
= –0.8V (Note 3)
–10
70 100
10
nA
nA
Transconductance g
m
(∆I
VC
/∆V
FBX
) (Note 3) 230 µS
V
C
Output Impedance (Note 3) 5 MΩ
V
FBX
Line Regulation [∆V
FBX
/(∆V
IN
• V
FBX(REG)
)] V
FBX
> 0V, 2.9V < V
IN
< 40V (Notes 3, 7)
V
FBX
< 0V, 2.9V < V
IN
< 40V (Notes 3, 7)
0.002
0.0025
0.056
0.05
%/V
%/V
V
C
Current Mode Gain (∆V
VC
/∆V
SENSE
) 5.5 V/V
V
C
Source Current V
FBX
= 0V, V
C
= 1.5V –15 µA
V
C
Sink Current V
FBX
= 1.7V
V
FBX
= –0.85V
12
11
µA
µA
Oscillator
Switching Frequency R
T
= 41.2k to GND, V
FBX
= 1.6V
R
T
= 140k to GND, V
FBX
= 1.6V
R
T
= 10.5k to GND, V
FBX
= 1.6V
270 300
100
1000
330 kHz
kHz
kHz
RT Voltage V
FBX
= 1.6V 1.2 V
Minimum Off-Time 220 ns
Minimum On-Time 220 ns
SYNC Input Low 0.4 V
SYNC Input High 1.5 V
SS Pull-Up Current SS = 0V, Current Out of Pin –10 µA
Low Dropout Regulator
INTV
CC
Regulation Voltage
l
7 7.2 7.4 V
INTV
CC
Undervoltage Lockout Threshold Falling INTV
CC
UVLO Hysteresis
2.6 2.7
0.1
2.8 V
V
INTV
CC
Overvoltage Lockout Threshold 16 17.5 V
INTV
CC
Current Limit V
IN
= 40V
V
IN
= 15V
30 40
95
55 mA
mA
INTV
CC
Load Regulation (∆V
INTVCC
/ V
INTVCC
) 0 < I
INTVCC
< 20mA, V
IN
= 8V –0.9 –0.5 %
INTV
CC
Line Regulation ∆V
INTVCC
/(V
INTVCC
• ∆V
IN
) 8V < V
IN
< 40V 0.008 0.03 %/V
Dropout Voltage (V
IN
– V
INTVCC
) V
IN
= 6V, I
INTVCC
= 20mA 400 mV
INTV
CC
Current in Shutdown SHDN/UVLO = 0V, INTV
CC
= 8V 16 µA
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LT3757EDD#PBF

Mfr. #:
Buy LT3757EDD#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Boost, Fly, SEPIC & Inv Cntr
Lifecycle:
New from this manufacturer.
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