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LT3470IDDB#TR

Conv DC-DC 4V to 40V Step Down Single-Out 1.25V to 16V 0.2A Automotive 8-Pin DFN EP T/R

厂商名称：ADI(亚德诺半导体)

厂商官网：https://www.analog.com

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参数 参考设计 预览
器件参数
参数名称
属性值
欧盟限制某些有害物质的使用
Not Compliant
ECCN (US)
EAR99
Part Status
Unconfirmed
HTS
8542.39.00.01
SVHC
Yes
SVHC Exceeds Threshold
Yes
类型
Type
Step Down
输出类型
Output Type
Adjustable
Switching Regulator
Yes
Number of Outputs
1
Output Voltage (V)
1.25 to 16
Maximum Output Current (A)
0.2
Minimum Input Voltage (V)
4
Maximum Input Voltage (V)
40
Operating Supply Voltage (V)
4 to 40
Typical Switch Current (A)
0.325
Typical Quiescent Current (uA)
35
Minimum Operating Temperature (°C)
-40
Maximum Operating Temperature (°C)
125
Supplier Temperature Grade
Industrial
系列
Packaging
Tape and Reel
Pin Count
8
Standard Package Name
DFN
Supplier Package
DFN EP
Mounting
Surface Mount
Package Height
0.75(Max)
Package Length
3
Package Width
2
PCB changed
8
Lead Shape
No Lead
参考设计
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文档预览
FEATURES
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LT3470
Micropower Buck Regulator
with Integrated Boost and
Catch Diodes
DESCRIPTION
The
LT
®
3470
is a micropower step-down DC/DC con-
verter that integrates a 300mA power switch, catch diode
and boost diode into low profile 3mm
×
2mm DD and
ThinSOT™ packages. The LT3470 combines Burst Mode
and continuous operation to allow the use of tiny induc-
tor 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, simplifying
power management in battery-powered systems. Fast
current limiting and hysteretic control protects the LT3470
and external components against shorted outputs, even
at 40V input.
All registered trademarks and trademarks are the property of their respective owners.
n
n
n
Low Quiescent Current: 26µA 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
×
2mm Thermally
Enhanced 8-Lead DD and 1mm ThinSOT Packages
AEC-Q100 Qualified for Automotive Applications
APPLICATIONS
n
n
n
n
n
Automotive Battery Regulation
Power for Portable Products
Distributed Supply Regulation
Industrial Supplies
Wall Transformer Regulation
TYPICAL APPLICATION
Efficiency and Power Loss vs Load Current
V
IN
7V TO 40V
V
IN
OFF ON
SHDN
BOOST
LT3470
SW
BIAS
22pF
2.2µF
GND
FB
604k
1%
200k
1%
3470 TA01a
90
0.22µF
33µH
V
OUT
5V
200mA
22µF
80
70
EFFICIENCY (%)
60
50
40
30
20
V
IN
= 12V
1000
100
POWER LOSS (mW)
10
1
10
0.1
1
10
LOAD CURRENT (mA)
100
3470 TA02
0.1
Rev. E
Document Feedback
For more information
www.analog.com
1
LT3470
ABSOLUTE MAXIMUM RATINGS
(Note 1)
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
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
PIN CONFIGURATION
TOP VIEW
FB 1
BIAS 2
BOOST 3
SW 4
9
8
7
6
5
SHDN
NC
V
IN
GND
TOP VIEW
SHDN
1
NC 2
V
IN
3
GND 4
8 FB
7 BIAS
6 BOOST
5 SW
DDB8 PACKAGE
8-LEAD (3mm
×
2mm) PLASTIC DFN
θ
JA
= 180°C/W
EXPOSED PAD (PIN 9) IS GROUND (MUST BE SOLDERED TO PCB)
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
θ
JA
= 140°C/W
ORDER INFORMATION
LEAD FREE FINISH
LT3470EDDB#TRMPBF
LT3470IDDB#TRMPBF
LT3470HDDB#TRMPBF
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
LT3470IDDB#TR
LT3470HDDB#TR
LT3470ETS8#TR
LT3470ITS8#TR
LT3470HTS8#TR
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
Rev. E
2
For more information
www.analog.com
LT3470
ORDER INFORMATION
AUTOMOTIVE PRODUCTS**
LT3470EDDB#WTRMPBF
LT3470IDDB#WTRMPBF
LT3470HDDB#WTRMPBF
LT3470EDDB#WTRPBF
LT3470IDDB#WTRPBF
LT3470HDDB#WTRPBF
LBPN
LBPP
LCNR
8-Lead (3mm
×
2mm) Plastic DFN
8-Lead (3mm
×
2mm) Plastic DFN
8-Lead (3mm
×
2mm) Plastic DFN
–40°C to 85°C
–40°C to 125°C
–40°C to 150°C
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications.
Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
**Versions
of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These
models are designated with a #W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your
local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for
these models.
ELECTRICAL CHARACTERISTICS
PARAMETER
Minimum Input Voltage
Quiescent Current from V
IN
Quiescent Current from Bias
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 10V, V
SHDN
= 10V, V
BOOST
= 15V, V
BIAS
= 3V unless otherwise specified.
CONDITIONS
l
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
0.2
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
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
l
l
l
l
FB Comparator Trip Voltage
FB Pin Bias Current (Note 3)
1.228
1.250
35
35
35
0.0006
500
0.7
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
I
SW
= 100mA
V
SHDN
= 2.5V
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
4V < V
IN
< 40V
l
215
215
250
325
225
630
630
0.2
650
0.2
l
1.7
7
1
2.5
Rev. E
For more information
www.analog.com
3
LT3470
ELECTRICAL CHARACTERISTICS
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 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.
TYPICAL PERFORMANCE CHARACTERISTICS
90
80
EFFICIENCY (%)
70
60
50
40
30
0.1
V
IN
= 24V
V
IN
= 36V
Efficiency, V
OUT
= 3.3V
L = TOKO D52LC 47µH
T
A
= 25°C
V
IN
= 12V
V
IN
= 7V
90
80
EFFICIENCY (%)
70
Efficiency, V
OUT
= 5V
L = TOKO D52LC 47µH
T
A
= 25°C
V
IN
= 12V
V
IN
= 36V
V
FB
(V)
1.250
1.260
V
FB
vs Temperature
1.255
V
IN
= 24V
60
50
1.245
40
30
0.1
1.240
–50
1
10
LOAD CURRENT (mA)
100
3470 G01
1
10
LOAD CURRENT (mA)
100
3470 G02
–25
0
25
50
75
TEMPERATURE (°C)
100
125
3470 G03
400
350
CURRENT LIMIT (mA)
Top and Bottom Switch Current
Limits (V
FB
= 0V) vs Temperature
V
IN
Quiescent Current
vs Temperature
50
30
25
BIAS CURRENT (µA)
BIAS < 3V
30
20
15
10
5
BIAS Quiescent Current
(Bias > 3V) vs Temperature
300
250
200
150
100
50
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3470 G04
40
V
IN
CURRENT (µA)
20
BIAS > 3V
10
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3470 G05
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3470 G06
Rev. E
4
For more information
www.analog.com
LT3470
TYPICAL PERFORMANCE CHARACTERISTICS
SHDN
Bias Current
vs Temperature
9
8
7
SHDN
CURRENT (µA)
6
5
4
3
2
1
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3470 G07
FB Bias Current (V
FB
= 1V)
vs Temperature
60
50
FB CURRENT (nA)
FB CURRENT (µA)
40
30
20
10
0
–50 –25
120
100
80
60
40
20
FB Bias Current (V
FB
= 0V)
vs Temperature
V
SHDN
= 36V
V
SHDN
= 2.5V
0
25 50 75 100 125 150
TEMPERATURE (°C)
3470 G08
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3470 G09
Switch V
CESAT
(I
SW
= 100mA)
vs Temperature
300
250
SWITCH V
CESAT
(mV)
SCHOTTKY V
F
(V)
200
150
100
50
0
–50 –25
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
25 50 75 100 125 150
TEMPERATURE (°C)
3470 G10
Boost Diode V
F
(I
F
= 50mA)
vs Temperature
0.7
0.6
0.5
0.4
0.3
0.2
0.1
Catch Diode V
F
(I
F
= 100mA)
vs Temperature
SCHOTTKY V
F
(V)
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3470 G11
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3470 G12
Diode Leakage (V
R
= 36V)
vs Temperature
60
55
SCHOTTKY DIODE LEAKAGE (µA)
50
45
40
35
30
25
20
15
10
5
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3470 G13
Switch V
CESAT
700
600
BOOST PIN CURRENT (mA)
SWITCH V
CESAT
(mV)
500
400
300
200
100
0
0
100
300
SWITCH CURRENT (mA)
200
400
3470 G14
BOOST Pin Current
14
12
10
8
6
4
2
0
0
100
200
300
SWITCH CURRENT (mA)
400
3470 G15
CATCH
BOOST
Rev. E
For more information
www.analog.com
5
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