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LT3470ITS8#TRM

Description
LT3470 - Micropower Buck Regulator with Integrated Boost and Catch Diodes; Package: SOT; Pins: 8; Temperature Range: -40°C to 85°C
CategoryPower/power management    The power supply circuit   
File Size254KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LT3470ITS8#TRM Overview

LT3470 - Micropower Buck Regulator with Integrated Boost and Catch Diodes; Package: SOT; Pins: 8; Temperature Range: -40°C to 85°C

LT3470ITS8#TRM Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?incompatible
MakerLinear ( ADI )
Parts packaging codeSOT
package instructionVSSOP, TSSOP8,.1
Contacts8
Manufacturer packaging codeTS8
Reach Compliance Codenot_compliant
ECCN codeEAR99
Other featuresALSO OPERATES IN ADJUSTABLE MODE FROM 1.25 V TO 16 V
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeCURRENT-MODE
Control TechnologyHYSTERETIC CURRENT MODE
Maximum input voltage40 V
Minimum input voltage4 V
Nominal input voltage10 V
JESD-30 codeR-PDSO-G8
JESD-609 codee0
length2.9 mm
Humidity sensitivity level1
Number of functions1
Number of terminals8
Maximum operating temperature125 °C
Minimum operating temperature-40 °C
Maximum output current0.2 A
Package body materialPLASTIC/EPOXY
encapsulated codeVSSOP
Encapsulate equivalent codeTSSOP8,.1
Package shapeRECTANGULAR
Package formSMALL OUTLINE, VERY THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height1 mm
surface mountYES
Switch configurationBUCK
technologyBIPOLAR
Temperature levelAUTOMOTIVE
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch0.65 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width1.6 mm

LT3470ITS8#TRM Preview

LT3470
Micropower Buck Regulator
with Integrated Boost and
Catch Diodes
FEATURES
DESCRIPTIO
Low Quiescent Current: 26
µ
A at 12V
IN
to 3.3V
OUT
Integrated Boost and Catch Diodes
Input Range: 4V to 40V
Low Output Ripple: <10mV
< 1µA in Shutdown Mode
Output Voltage: 1.25V to 16V
200mA Output Current
Hysteretic Mode Control
– Low Ripple Burst Mode
®
Operation at Light Loads
– Continuous Operation at Higher Loads
Solution Size as Small as 50mm
2
Low Profile (0.75mm) 3mm x 2mm Thermally
Enhanced 8-Lead DD and 1mm ThinSOT Packages
The LT
®
3470 is a micropower step-down DC/DC converter
that integrates a 300mA power switch, catch diode
and boost diode into low profile 3mm x 2mm DD and
ThinSOT
TM
packages. The LT3470 combines Burst Mode
and continuous operation to allow the use of tiny inductor
and capacitors while providing a low ripple output to
loads of up to 200mA.
With its wide input range of 4V to 40V, the LT3470 can
regulate a wide variety of power sources, from 2-cell
Li-Ion batteries to unregulated wall transformers and lead-
acid batteries. Quiescent current in regulation is just 26µA
in a typical application while a zero current shutdown
mode disconnects the load from the input source, simpli-
fying power management in battery-powered systems.
Fast current limiting and hysteretic control protects the
LT3470 and external components against shorted out-
puts, even at 40V input.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation. ThinSOT is a
trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
APPLICATIO S
Automotive Battery Regulation
Power for Portable Products
Distributed Supply Regulation
Industrial Supplies
Wall Transformer Regulation
TYPICAL APPLICATIO
V
IN
7V TO 40V
V
IN
OFF ON
SHDN
BOOST
Efficiency and Power Loss vs Load Current
90
V
IN
= 12V
1000
0.22µF
LT3470
SW
BIAS
22pF
2.2µF
FB
GND
200k
1%
604k
1%
22µF
33µH
V
OUT
5V
200mA
80
70
100
EFFICIENCY (%)
60
50
40
30
20
10
0.1
0.1
1
10
LOAD CURRENT (mA)
100
3470 TA02
U
POWER LOSS (mW)
10
1
3470fc
U
U
1
LT3470
ABSOLUTE
AXI U
RATI GS
V
IN
, SHDN Voltage .................................................. 40V
BOOST Pin Voltage ................................................. 47V
BOOST Pin Above SW Pin ...................................... 25V
FB Voltage ................................................................ 5V
BIAS Voltage ............................................................ 25V
SW Voltage ................................................................V
IN
Maximum Junction Temperature
LT3470E, LT3470I ............................................ 125°C
PI CO FIGURATIO
TOP VIEW
FB 1
BIAS 2
BOOST 3
SW 4
9
8
7
6
5
SHDN
NC
V
IN
GND
DDB8 PACKAGE
8-LEAD (3mm
×
2mm) PLASTIC DFN
θ
JA
= 80°C/ W
EXPOSED PAD (PIN 9) IS GROUND (MUST BE SOLDERED TO PCB)
ORDER I FOR ATIO
LEAD FREE FINISH
LT3470EDDB#PBF
LT3470IDDB#PBF
LT3470HDDB#PBF
LT3470ETS8#PBF
LT3470ITS8#PBF
LT3470HTS8#PBF
LEAD BASED FINISH
LT3470EDDB
LT3470IDDB
LT3470HDDB
LT3470ETS8
LT3470ITS8
LT3470HTS8
TAPE AND REEL
LT3470EDDB#TRPBF
LT3470IDDB#TRPBF
LT3470HDDB#TRPBF
LT3470ETS8#TRPBF
LT3470ITS8#TRPBF
LT3470HTS8#TRPBF
TAPE AND REEL
LT3470EDDB#TR
LT3470EDDB#TR
LT3470EDDB#TR
LT3470ETS8#TR
LT3470ITS8#TR
LT3470HTS8#TR
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
3470fc
2
U
U
W W
U
W
W
(Note 1)
LT3470H .......................................................... 150°C
Operating Temperature Range (Note 2)
LT3470E ............................................. – 40°C to 85°C
LT3470I ............................................ – 40°C to 125°C
LT3470H .......................................... – 40°C to 150°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
U
U
U
TOP VIEW
SHDN 1
NC 2
V
IN
3
GND 4
8 FB
7 BIAS
6 BOOST
5 SW
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
θ
JA
= 140°C/ W
PART MARKING
LBPN
LBPP
LCNR
LTBDM
LTBPW
LTCNQ
PART MARKING
LBPN
LBPP
LCNR
LTBDM
LTBPW
LTCNQ
PACKAGE DESCRIPTION
8-Lead (3mm
×
2mm) Plastic DFN
8-Lead (3mm
×
2mm) Plastic DFN
8-Lead (3mm
×
2mm) Plastic DFN
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
PACKAGE DESCRIPTION
8-Lead (3mm
×
2mm) Plastic DFN
8-Lead (3mm
×
2mm) Plastic DFN
8-Lead (3mm
×
2mm) Plastic DFN
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 125°C
–40°C to 150°C
–40°C to 85°C
–40°C to 125°C
–40°C to 150°C
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 125°C
–40°C to 150°C
–40°C to 85°C
–40°C to 125°C
–40°C to 150°C
LT3470
ELECTRICAL CHARACTERISTICS
The
denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C.
V
IN
= 10V, V
SHDN
= 10V, V
BOOST
= 15V, V
BIAS
= 3V unless otherwise specified.
PARAMETER
Minimum Input Voltage
Quiescent Current from V
IN
V
SHDN
= 0.2V
V
BIAS
= 3V, Not Switching
V
BIAS
= 0V, Not Switching
V
SHDN
= 0.2V
V
BIAS
= 3V, Not Switching
V
BIAS
= 0V, Not Switching
V
FB
Falling
V
FB
= 1V, E and I-Grade
H-Grade
FB Voltage Line Regulation
Minimum Switch Off-Time (Note 5)
Switch Leakage Current
Switch V
CESAT
Switch Top Current Limit
Switch Bottom Current Limit
Catch Schottky Drop
Catch Schottky Reverse Leakage
Boost Schottky Drop
Boost Schottky Reverse Leakage
Minimum Boost Voltage (Note 4)
BOOST Pin Current
SHDN Pin Current
SHDN Input Voltage High
SHDN Input Voltage Low
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 LT3470E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
I
SW
= 100mA
V
SHDN
= 2.5V
2.5
0.2
I
SW
= 100mA (TS8 Package)
I
SW
= 100mA (DD8 Package)
V
FB
= 0V
V
FB
= 0V
I
SH
= 100mA (TS8 Package)
I
SH
= 100mA (DD8 Package)
V
SW
= 10V
I
SH
= 30mA
V
SW
= 10V, V
BIAS
= 0V
CONDITIONS
MIN
TYP
0.1
10
35
0.1
25
0.1
MAX
4
0.5
18
50
0.5
60
1.5
1.265
80
150
225
0.01
1.5
300
435
775
2
775
2
2.2
12
5
UNITS
V
µA
µA
µA
µA
µA
µA
V
nA
nA
nA
%/V
ns
µA
mV
mV
mA
mA
mV
mV
µA
mV
µA
V
mA
µA
V
V
Quiescent Current from Bias
FB Comparator Trip Voltage
FB Pin Bias Current (Note 3)
1.228
1.250
35
35
35
0.0006
500
0.7
215
215
4V < V
IN
< 40V
250
325
225
630
630
0.2
650
0.2
1.7
7
1
with statistical process controls. The LT3470I specifications are
guaranteed over the –40°C to 125°C temperature range. LT3470H
specifications are guaranteed over –40°C to 150°C temperature range.
Note 3:
Bias current flows out of the FB pin.
Note 4:
This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
Note 5:
This parameter is assured by design and correlation with statistical
process controls.
3470fc
3
LT3470
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency, V
OUT
= 3.3V
90
80
L = TOKO D52LC 47µH
T
A
= 25°C
V
IN
= 12V
V
IN
= 7V
90
80
L = TOKO D52LC 47µH
T
A
= 25°C
V
IN
= 12V
EFFICIENCY (%)
EFFICIENCY (%)
70
V
IN
= 24V
60
50
40
30
0.1
V
IN
= 36V
V
FB
(V)
10
1
LOAD CURRENT (mA)
Top and Bottom Switch Current
Limits (V
FB
= 0V) vs Temperature
400
350
CURRENT LIMIT (mA)
BIAS CURRENT (µA)
300
V
IN
CURRENT (µA)
250
200
150
100
50
0
– 50 – 25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3470 G04
SHDN Bias Current
vs Temperature
9
8
7
V
SHDN
= 36V
SHDN CURRENT (µA)
FB CURRENT (nA)
6
5
4
3
2
V
SHDN
= 2.5V
1
0
–50
–25
0
25
50
75 100 125 150
TEMPERATURE (°C)
3470 G07
4
U W
100
3470 G01
Efficiency, V
OUT
= 5V
1.260
V
FB
vs Temperature
1.255
70
V
IN
= 24V
60
50
V
IN
= 36V
1.250
1.245
40
30
0.1
10
1
LOAD CURRENT (mA)
100
3470 G02
1.240
–50
–25
75
0
25
50
TEMPERATURE (°C)
100
125
3470 G03
V
IN
Quiescent Current
vs Temperature
50
30
25
BIAS Quiescent Current
(Bias > 3V) vs Temperature
40
BIAS < 3V
30
20
15
10
5
0
–50
–25
20
BIAS > 3V
10
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3470 G05
0
25
50
75
100 125 150
TEMPERATURE (°C)
3470 G06
FB Bias Current (V
FB
= 1V)
vs Temperature
60
50
40
30
20
10
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3470 G08
3470fc
LT3470
TYPICAL PERFOR A CE CHARACTERISTICS
FB Bias Current (V
FB
= 0V)
vs Temperature
120
100
SWITCH V
CESAT
(mV)
FB CURRENT (µA)
80
60
40
20
0
–50 –25
200
150
100
50
0
–50 –25
SCHOTTKY V
F
(V)
0
25 50 75 100 125 150
TEMPERATURE (°C)
3470 G10
0
25 50 75 100 125 150
TEMPERATURE (°C)
3470 G09
Catch Diode V
F
(I
F
= 100mA)
vs Temperature
0.7
SCHOTTKY DIODE LEAKAGE (µA)
0.6
0.5
0.4
40
35
30
25
20
15
10
5
0
–50 –25
SWITCH V
CESAT
(mV)
SCHOTTKY V
F
(V)
0.3
0.2
0.1
0
–50
–25
0
25
50
75
100 125 150
TEMPERATURE (°C)
3470 G12
BOOST Pin Current
14
12
BOOST PIN CURRENT (mA)
SCHOTTKY V
F
(V)
10
8
6
4
2
0
0
100
300
SWITCH CURRENT (mA)
200
400
3470 G15
U W
Switch V
CESAT
(I
SW
= 100mA)
vs Temperature
300
250
Boost Diode V
F
(I
F
= 50mA)
vs Temperature
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
– 50 – 25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3470 G11
Diode Leakage (V
R
= 36V)
vs Temperature
60
55
50
45
CATCH
BOOST
700
600
500
400
300
200
100
0
Switch V
CESAT
0
25 50 75 100 125 150
TEMPERATURE (°C)
3470 G13
0
100
300
SWITCH CURRENT (mA)
200
400
3470 G14
Catch Diode Forward Voltage
1.0
0.8
0.6
0.4
0.2
0
0
200
300
100
CATCH DIODE CURRENT (mA)
400
3470 G16
3470fc
5

LT3470ITS8#TRM Related Products

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Description LT3470 - Micropower Buck Regulator with Integrated Boost and Catch Diodes; Package: SOT; Pins: 8; Temperature Range: -40°C to 85°C LT3470 - Micropower Buck Regulator with Integrated Boost and Catch Diodes; Package: DFN; Pins: 8; Temperature Range: -40°C to 85°C LT3470 - Micropower Buck Regulator with Integrated Boost and Catch Diodes; Package: DFN; Pins: 8; Temperature Range: -40°C to 85°C LT3470 - Micropower Buck Regulator with Integrated Boost and Catch Diodes; Package: SOT; Pins: 8; Temperature Range: -40°C to 85°C LT3470A - Micropower Buck Regulator with Integrated Boost and Catch Diodes; Package: DFN; Pins: 8; Temperature Range: -40°C to 85°C LT3470 - Micropower Buck Regulator with Integrated Boost and Catch Diodes; Package: DFN; Pins: 8; Temperature Range: -40°C to 85°C LT3470 - Micropower Buck Regulator with Integrated Boost and Catch Diodes; Package: SOT; Pins: 8; Temperature Range: -40°C to 85°C LT3470 - Micropower Buck Regulator with Integrated Boost and Catch Diodes; Package: SOT; Pins: 8; Temperature Range: -40°C to 85°C LT3470 - Micropower Buck Regulator with Integrated Boost and Catch Diodes; Package: DFN; Pins: 8; Temperature Range: -40°C to 85°C
Brand Name Linear Technology Linear Technology Linear Technology Linear Technology Linear Technology Linear Technology Linear Technology Linear Technology Linear Technology
Is it Rohs certified? incompatible incompatible incompatible incompatible conform to incompatible incompatible incompatible incompatible
Maker Linear ( ADI ) Linear ( ADI ) Linear ( ADI ) Linear ( ADI ) Linear ( ADI ) Linear ( ADI ) Linear ( ADI ) Linear ( ADI ) Linear ( ADI )
Parts packaging code SOT DFN DFN SOT DFN DFN SOT SOT DFN
package instruction VSSOP, TSSOP8,.1 HVSON, SOLCC8,.08,20 HVSON, SOLCC8,.08,20 VSSOP, TSSOP8,.1 HVSON, SOLCC8,.08,20 HVSON, SOLCC8,.08,20 VSSOP, TSSOP8,.1 VSSOP, TSSOP8,.1 HVSON, SOLCC8,.08,20
Contacts 8 8 8 8 8 8 8 8 8
Manufacturer packaging code TS8 DDB DDB TS8 DDB DDB TS8 TS8 DDB
Reach Compliance Code not_compliant not_compliant not_compliant not_compliant compliant not_compliant not_compliant not_compliant not_compliant
ECCN code EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99
Analog Integrated Circuits - Other Types SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR
control mode CURRENT-MODE CURRENT-MODE CURRENT-MODE VOLTAGE-MODE CURRENT-MODE CURRENT-MODE CURRENT-MODE CURRENT-MODE CURRENT-MODE
Maximum input voltage 40 V 40 V 40 V 40 V 40 V 40 V 40 V 40 V 40 V
Minimum input voltage 4 V 4 V 4 V 4 V 4 V 4 V 4 V 4 V 4 V
Nominal input voltage 10 V 10 V 10 V 10 V 10 V 10 V 10 V 10 V 10 V
JESD-30 code R-PDSO-G8 R-PDSO-N8 R-PDSO-N8 R-PDSO-G8 R-PDSO-N8 R-PDSO-N8 R-PDSO-G8 R-PDSO-G8 R-PDSO-N8
JESD-609 code e0 e0 e0 e0 e3 e0 e0 e0 e0
length 2.9 mm 3 mm 3 mm 2.9 mm 3 mm 3 mm 2.9 mm 2.9 mm 3 mm
Humidity sensitivity level 1 1 1 1 1 1 1 1 1
Number of functions 1 1 1 1 1 1 1 1 1
Number of terminals 8 8 8 8 8 8 8 8 8
Maximum operating temperature 125 °C 85 °C 125 °C 125 °C 85 °C 85 °C 70 °C 70 °C 125 °C
Maximum output current 0.2 A 0.2 A 0.2 A 0.2 A 0.56 A 0.2 A 0.2 A 0.2 A 0.2 A
Package body material PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code VSSOP HVSON HVSON VSSOP HVSON HVSON VSSOP VSSOP HVSON
Encapsulate equivalent code TSSOP8,.1 SOLCC8,.08,20 SOLCC8,.08,20 TSSOP8,.1 SOLCC8,.08,20 SOLCC8,.08,20 TSSOP8,.1 TSSOP8,.1 SOLCC8,.08,20
Package shape RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE, VERY THIN PROFILE, SHRINK PITCH SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE SMALL OUTLINE, VERY THIN PROFILE, SHRINK PITCH SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE SMALL OUTLINE, VERY THIN PROFILE, SHRINK PITCH SMALL OUTLINE, VERY THIN PROFILE, SHRINK PITCH SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius) 235 235 235 235 250 235 235 235 235
Certification status Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified
Maximum seat height 1 mm 0.8 mm 0.8 mm 1 mm 0.8 mm 0.8 mm 1 mm 1 mm 0.8 mm
surface mount YES YES YES YES YES YES YES YES YES
Switch configuration BUCK BUCK BUCK BUCK BUCK BUCK BUCK BUCK BUCK
technology BIPOLAR BIPOLAR BIPOLAR BIPOLAR BIPOLAR BIPOLAR BIPOLAR BIPOLAR BIPOLAR
Temperature level AUTOMOTIVE OTHER AUTOMOTIVE AUTOMOTIVE OTHER OTHER COMMERCIAL COMMERCIAL AUTOMOTIVE
Terminal surface Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Matte Tin (Sn) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
Terminal form GULL WING NO LEAD NO LEAD GULL WING NO LEAD NO LEAD GULL WING GULL WING NO LEAD
Terminal pitch 0.65 mm 0.5 mm 0.5 mm 0.65 mm 0.5 mm 0.5 mm 0.65 mm 0.65 mm 0.5 mm
Terminal location DUAL DUAL DUAL DUAL DUAL DUAL DUAL DUAL DUAL
Maximum time at peak reflow temperature 20 20 20 20 NOT SPECIFIED 20 20 20 20
width 1.6 mm 2 mm 2 mm 1.6 mm 2 mm 2 mm 1.6 mm 1.6 mm 2 mm
Other features ALSO OPERATES IN ADJUSTABLE MODE FROM 1.25 V TO 16 V ALSO OPERATES IN ADJUSTABLE MODE FROM 1.25 V TO 16 V ALSO OPERATES IN ADJUSTABLE MODE FROM 1.25 V TO 16 V - ALSO OPERATES IN ADJUSTABLE MODE FROM 1.25 V TO 16 V ALSO OPERATES IN ADJUSTABLE MODE FROM 1.25 V TO 16 V ALSO OPERATES IN ADJUSTABLE MODE FROM 1.25 V TO 16 V ALSO OPERATES IN ADJUSTABLE MODE FROM 1.25 V TO 16 V ALSO OPERATES IN ADJUSTABLE MODE FROM 1.25 V TO 16 V
Control Technology HYSTERETIC CURRENT MODE HYSTERETIC CURRENT MODE HYSTERETIC CURRENT MODE - HYSTERETIC CURRENT MODE HYSTERETIC CURRENT MODE HYSTERETIC CURRENT MODE HYSTERETIC CURRENT MODE HYSTERETIC CURRENT MODE
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