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LT3470ETS8#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LT3470
1
3470fd
Typical applicaTion
FeaTures
applicaTions
DescripTion
Micropower Buck Regulator
with Integrated Boost and
Catch Diodes
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.
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.
Efficiency and Power Loss vs Load Current
n
Low Quiescent Current: 26µA at 12V
IN
to 3.3V
OUT
n
Integrated Boost and Catch Diodes
n
Input Range: 4V to 40V
n
Low Output Ripple: <10mV
n
<1µA in Shutdown Mode
n
Output Voltage: 1.25V to 16V
n
200mA Output Current
n
Hysteretic Mode Control
– Low Ripple Burst Mode
®
Operation at Light Loads
– Continuous Operation at Higher Loads
n
Solution Size as Small as 50mm
2
n
Low Profile (0.75mm) 3mm × 2mm Thermally
Enhanced 8-Lead DD and 1mm ThinSOT Packages
n
Automotive Battery Regulation
n
Power for Portable Products
n
Distributed Supply Regulation
n
Industrial Supplies
n
Wall Transformer Regulation
LOAD CURRENT (mA)
30
EFFICIENCY (%)
POWER LOSS (mW)
40
60
80
90
0.1 10 100
3470 TA02
20
1
70
50
10
1
1000
100
10
0.1
V
IN
= 12V
V
IN
BOOST
LT3470
SWSHDN
0.22µF
22pF
22µF
2.2µF
3470 TA01a
V
IN
7V TO 40V
V
OUT
5V
200mA
604k
1%
200k
1%
33µH
BIAS
FB
GND
OFF ON
LT3470
2
3470fd
absoluTe MaxiMuM raTings
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
(Note 1)
orDer inForMaTion
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
TOP VIEW
9
DDB8 PACKAGE
8-LEAD (3mm × 2mm) PLASTIC DFN
5
6
7
8
4
3
2
1FB
BIAS
BOOST
SW
SHDN
NC
V
IN
GND
θ
JA
= 180°C/W
EXPOSED PAD (PIN 9) IS GROUND (MUST BE SOLDERED TO PCB)
SHDN 1
NC 2
V
IN
3
GND 4
8 FB
7 BIAS
6 BOOST
5 SW
TOP VIEW
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
θ
JA
= 140°C/W
pin conFiguraTion
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3470EDDB#PBF LT3470EDDB#TRPBF LBPN
8-Lead (3mm × 2mm) Plastic DFN
–40°C to 85°C
LT3470IDDB#PBF LT3470IDDB#TRPBF LBPP
8-Lead (3mm × 2mm) Plastic DFN
–40°C to 125°C
LT3470HDDB#PBF LT3470HDDB#TRPBF LCNR
8-Lead (3mm × 2mm) Plastic DFN
–40°C to 150°C
LT3470ETS8#PBF LT3470ETS8#TRPBF LTBDM 8-Lead Plastic TSOT-23 –40°C to 85°C
LT3470ITS8#PBF LT3470ITS8#TRPBF LTBPW 8-Lead Plastic TSOT-23 –40°C to 125°C
LT3470HTS8#PBF LT3470HTS8#TRPBF LTCNQ 8-Lead Plastic TSOT-23 –40°C to 150°C
LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3470EDDB LT3470EDDB#TR LBPN
8-Lead (3mm × 2mm) Plastic DFN
–40°C to 85°C
LT3470IDDB LT3470IDDB#TR LBPP
8-Lead (3mm × 2mm) Plastic DFN
–40°C to 125°C
LT3470HDDB LT3470HDDB#TR LCNR
8-Lead (3mm × 2mm) Plastic DFN
–40°C to 150°C
LT3470ETS8 LT3470ETS8#TR LTBDM 8-Lead Plastic TSOT-23
–40°C to 85°C
LT3470ITS8 LT3470ITS8#TR LTBPW 8-Lead Plastic TSOT-23
–40°C to 125°C
LT3470HTS8 LT3470HTS8#TR LTCNQ 8-Lead Plastic TSOT-23
–40°C to 150°C
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/
LT3470
3
3470fd
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.
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.
elecTrical characTerisTics
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage
●
4 V
Quiescent Current from V
IN
V
SHDN
= 0.2V
V
BIAS
= 3V, Not Switching
V
BIAS
= 0V, Not Switching
●
0.1
10
35
0.5
18
50
µA
µA
µA
Quiescent Current from Bias V
SHDN
= 0.2V
V
BIAS
= 3V, Not Switching
V
BIAS
= 0V, Not Switching
●
0.1
25
0.1
0.5
60
1.5
µA
µA
µA
FB Comparator Trip Voltage V
FB
Falling
●
1.228 1.250 1.265 V
FB Pin Bias Current (Note 3) V
FB
= 1V, E- and I-Grade
●
35
35
80
150
nA
nA
H-Grade
●
35 225 nA
FB Voltage Line Regulation 4V < V
IN
< 40V 0.0006 0.01 %/V
Minimum Switch Off-Time (Note 5) 500 ns
Switch Leakage Current 0.7 1.5 µA
Switch V
CESAT
I
SW
= 100mA (TS8 Package)
I
SW
= 100mA (DD8 Package)
215
215
300 mV
mV
Switch Top Current Limit V
FB
= 0V 250 325 435 mA
Switch Bottom Current Limit V
FB
= 0V 225 mA
Catch Schottky Drop I
SH
= 100mA (TS8 Package)
I
SH
= 100mA (DD8 Package)
630
630
775 mV
mV
Catch Schottky Reverse Leakage V
SW
= 10V 0.2 2 µA
Boost Schottky Drop I
SH
= 30mA 650 775 mV
Boost Schottky Reverse Leakage V
SW
= 10V, V
BIAS
= 0V 0.2 2 µA
Minimum Boost Voltage (Note 4)
●
1.7 2.2 V
BOOST Pin Current I
SW
= 100mA 7 12 mA
SHDN Pin Current V
SHDN
= 2.5V 1 5 µA
SHDN Input Voltage High 2.5 V
SHDN Input Voltage Low 0.2 V
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LT3470ETS8#TRMPBF

Mfr. #:
Buy LT3470ETS8#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 300mA, 40V Micropower Step-Down Reg in ThinSOT
Lifecycle:
New from this manufacturer.
Delivery:
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