LT3470AE ............................................– 40°C to 85°C
LT3470AI ........................................... –40°C to 125°C
LT3470AH .......................................... –40°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
DDB8 PACKAGE
8-LEAD (3mm × 2mm) PLASTIC DFN
θ
JA
= 80°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT3470AEDDB#PBF
LT3470AIDDB#PBF
LT3470AHDDB#PBF
TAPE AND REEL
LT3470AEDDB#TRPBF
LT3470AIDDB#TRPBF
LT3470AHDDB#TRPBF
PART MARKING*
LDPR
LDPR
LDPR
PACKAGE DESCRIPTION
8-Lead (3mm
×
2mm) Plastic DFN
8-Lead (3mm
×
2mm) Plastic DFN
8-Lead (3mm
×
2mm) Plastic DFN
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 125°C
–40°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.
Consult LTC Marketing for information on non-standard 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/
3470afb
2
LT3470A
ELECTRICAL CHARACTERISTICS
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
H-Grade
FB Voltage Line Regulation
Minimum Switch Off-Time (Note 5)
Maximum Duty Cycle
Switch Leakage Current
Switch V
CESAT
Switch V
CESAT
Without Boost
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
Bias Pin Preload
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 LT3470AE 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 LT3470AI specifications are
I
SW
= 100mA
V
BOOST
= 10V
V
SHDN
= 2.5V
2
0.2
I
SW
= 100mA
V
BOOST
= V
SW
V
FB
= 0V
V
FB
= 0V
I
SW
= 100mA
V
SW
= 10V
I
BIAS
= 50mA
V
SW
= 10V, V
BIAS
= 0V
●
●
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
●
●
MIN
TYP
0.1
10
40
0.1
30
0.1
MAX
4
0.5
18
55
0.5
60
1.5
1.265
80
150
225
0.02
UNITS
V
μA
μA
μA
μA
μA
μA
V
nA
nA
nA
%/V
ns
%
Quiescent Current from Bias
●
●
●
●
FB Comparator Trip Voltage
FB Pin Bias Current (Note 3)
1.228
1.250
35
35
35
0.0006
500
4V < V
IN
< 40V
90
95
0.7
150
0.9
1.2
560
1.5
μA
mV
V
mA
mA
mV
320
440
280
600
0.2
690
0.2
1.7
2.3
50
1
2
775
2
2.2
5
5
μA
mV
μA
V
mA
mA
μA
V
V
guaranteed over the –40°C to 125°C temperature range. LT3470AH
specifications are guaranteed over the –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
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