Datasheet

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