Boost/SEPIC/Inverting Converter. LT8335 Datasheet

LT8335 Converter. Datasheet pdf. Equivalent

LT8335 Datasheet
Recommendation LT8335 Datasheet
Part LT8335
Description Boost/SEPIC/Inverting Converter
Feature LT8335; FEATURES nn 3V to 25V Input Voltage Range nn Ultralow Quiescent Current and Low Ripple Burst Mode® O.
Manufacture Linear
Datasheet
Download LT8335 Datasheet




Linear LT8335
FEATURES
nn 3V to 25V Input Voltage Range
nn Ultralow Quiescent Current and Low Ripple Burst
Mode® Operation: IQ = 6µA
nn 2A, 28V Power Switch
nn Positive or Negative Output Voltage Programming
with a Single Feedback Pin
nn Fixed 2MHz Switching Frequency
nn Programmable Undervoltage Lockout (UVLO)
nn Internal Compensation and Soft-Start
nn Low Profile (0.75mm) 8-Lead (3mm × 2mm) DFN
Package
APPLICATIONS
nn Industrial and Automotive
nn Telecom
nn Medical Diagnostic Equipment
nn Portable Electronics
LT8335
Low IQ Boost/SEPIC/
Inverting Converter
with 2A, 28V Switch
DESCRIPTION
The LT®8335 is a current mode DC/DC converter capable
of generating either positive or negative output voltages
using a single feedback pin. It can be configured as a
boost, SEPIC or inverting converter consuming as low as
6µA of quiescent current. Low ripple Burst Mode opera-
tion maintains high efficiency down to very low output
currents while keeping the output ripple below 15mV in
a typical application. The internally compensated current
mode architecture results in stable operation over a wide
range of input and output voltages. Integrated soft-start
and frequency foldback functions are included to control
inductor current during start-up. The 2MHz operation
combined with the small 8-lead DFN package, enables
low cost, area efficient solutions.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
TYPICAL APPLICATION
3V to 6V Input, 12V Boost Converter
VIN
3V TO 6V
1.2µH
4.7µF
VIN
EN/UVLO
SW
GND
LT8335
INTVCC
1µF
FBX
22µF
1M
V12OVUT
275mA
440mA
520mA
AT
AT
AT
VVVIIINNN
=
=
=
3V
5V
6V
4.7pF
154k
8335 TA01
Efficiency and Power Loss
100 1000
90
80 EFFICIENCY
70
800
60 600
50
POWER LOSS
40
400
30
20 VIN = 3V 200
10
0
VIN = 5V
VIN = 6V
0
0 100 200 300 400 500 600
LOAD CURRENT (mA)
8335 TA01b
For more information www.linear.com/LT8335
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Linear LT8335
LT8335
ABSOLUTE MAXIMUM RATINGS
(Note 1)
SW.............................................................................28V
VIN, EN/UVLO.............................................................25V
EN/UVLO Pin Above VIN Pin.........................................6V
INTVCC (Note 2)...........................................................4V
FBX............................................................................±4V
Operating Junction Temperature (Note 3)
LT8335E, LT8335I.............................. –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
FBX 1
8 EN/UVLO
NC 2 9 7 INTVCC
SW 3 GND 6 VIN
SW 4
5 GND
DDB PACKAGE
8-LEAD (3mm × 2mm) PLASTIC DFN
θJA = 80.5°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION http://www.linear.com/product/LT8335#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT8335EDDB#PBF
LT8335EDDB#TRPBF
LGVM
8-Lead (3mm × 2mm) Plastic DFN
–40°C to 125°C
LT8335IDDB#PBF
LT8335IDDB#TRPBF
LGVM
8-Lead (3mm × 2mm) Plastic DFN
–40°C to 125°C
Consult LTC Marketing for information on 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/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
8335f
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Linear LT8335
LT8335
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, EN/UVLO = 12V unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX
VIN Operating Voltage Range
VIN Quiescent Current at Shutdown
VEN/UVLO = 0.2V
l3
25
0.9 2
l 25
VEN/UVLO = 1.5V
25
l 3.6 9.5
VIN Quiescent Current
Sleep Mode, Not Switching
5.5 10
l 8.5 15
Active Mode, Not Switching
780 1100
l 840 1200
FBX Regulation
FBX Regulation Voltage
FBX > 0V
FBX < 0V
l 1.568
1.6
l –0.820 –0.80
1.632
–0.780
FBX Line Regulation
FBX Pin Current
FBX > 0V, 3V < VIN < 25V
FBX < 0V, 3V < VIN < 25V
FBX = 1.6V, –0.8V
l –10
0.005
0.005
0.015
0.015
10
Oscillator
Switching Frequency (fOSC)
Minimum On-Time
l 1.80
2.0
74
2.20
115
Minimum Off-Time
47 65
Switch
Maximum Switch Current Limit Threshold
l 2.0
2.5
3.0
Switch RDS(ON)
Switch Leakage Current
EN/UVLO Logic
ISW = 0.5A
VSW = 28V
170
0.1 1
EN/UVLO Pin Threshold (Rising)
Start Switching
l 1.620 1.68 1.745
EN/UVLO Pin Threshold (Falling)
Stop Switching
l 1.556 1.60 1.644
EN/UVLO Pin Current
Soft-Start
VEN/UVLO = 1.6V
l –40
40
Soft-Start Time
1.2
UNITS
V
µA
µA
µA
µA
µA
µA
µA
µA
V
V
%/V
%/V
nA
MHz
ns
ns
A
µA
V
V
nA
ms
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: INTVCC cannot be externally driven. No additional components or
loading is allowed on this pin.
Note 3: The LT8335E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT8335I is guaranteed over the full –40°C to 125°C operating junction
temperature range. High junction temperatures degrade operating
lifetimes. Operating lifetime is derated at junction temperatures greater
than 125°C.
Note 4: The IC includes overtemperature protection that is intended to
protect the device during overload conditions. Junction temperature will
exceed 150°C when overtemperature protection is active. Continuous
operation above the specified maximum operating junction temperature
will reduce lifetime.
For more information www.linear.com/LT8335
8335f
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