Datasheet

LT3470A
3
3470afb
ELECTRICAL CHARACTERISTICS
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.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage
●
4V
Quiescent Current from V
IN
V
SHDN
= 0.2V
V
BIAS
= 3V, Not Switching
V
BIAS
= 0V, Not Switching
●
0.1
10
40
0.5
18
55
µA
µA
µA
Quiescent Current from Bias V
SHDN
= 0.2V
V
BIAS
= 3V, Not Switching
V
BIAS
= 0V, Not Switching
●
0.1
30
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
H-Grade
●
●
35
35
35
80
150
225
nA
nA
nA
FB Voltage Line Regulation 4V < V
IN
< 40V 0.0006 0.02 %/V
Minimum Switch Off-Time (Note 5) 500 ns
Maximum Duty Cycle
●
90 95 %
Switch Leakage Current 0.7 1.5 µA
Switch V
CESAT
I
SW
= 100mA 150 mV
Switch V
CESAT
Without Boost V
BOOST
= V
SW
0.9 1.2 V
Switch Top Current Limit V
FB
= 0V 320 440 560 mA
Switch Bottom Current Limit V
FB
= 0V 280 mA
Catch Schottky Drop I
SW
= 100mA 600 mV
Catch Schottky Reverse Leakage V
SW
= 10V 0.2 2 µA
Boost Schottky Drop I
BIAS
= 50mA 690 775 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 2.3 5 mA
Bias Pin Preload V
BOOST
= 10V 50 mA
SHDN Pin Current V
SHDN
= 2.5V 1 5 µA
SHDN Input Voltage High 2V
SHDN Input Voltage Low 0.2 V
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 specifi cations
from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT3470AI specifi cations are
guaranteed over the –40°C to 125°C temperature range. LT3470AH
specifi cations are guaranteed over the –40°C to 150°C temperature range.
Note 3: Bias current fl ows 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.