lt3470a Linear Technology Corporation, lt3470a Datasheet - Page 3

• Manufacturer Part Number: lt3470a
• Description: Micropower Buck Regulator With Integrated Boost And Catch Diodes
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
The
V
PARAMETER
Minimum Input Voltage
Quiescent Current from V
Quiescent Current from Bias
FB Comparator Trip Voltage
FB Pin Bias Current (Note 3)
FB Voltage Line Regulation
Minimum Switch Off-Time (Note 5)
Maximum Duty Cycle
Switch Leakage Current
Switch V
Switch V
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 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
IN
= 10V, V
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at T
CESAT
CESAT
SHDN
Without Boost
= 10V, V
IN
BOOST
= 15V, V
BIAS
CONDITIONS
V
V
V
V
V
V
V
V
4V < V
I
V
V
V
I
V
I
V
I
V
V
SW
SH
SH
SW
SHDN
BIAS
BIAS
SHDN
BIAS
BIAS
FB
FB
BOOST
FB
FB
SW
SW
BOOST
SHDN
= 3V unless otherwise specifi ed.
= 100mA
= 50mA
Falling
= 1V
= 0V
= 0V
= 100mA
= 100mA
= 10V
= 10V, V
= 3V, Not Switching
= 0V, Not Switching
= 3V, Not Switching
= 0V, Not Switching
IN
= 0.2V
= 0.2V
= 2.5V
= V
= 10V
< 40V
SW
BIAS
= 0V
with statistical process controls. The LT3470AI specifi cations are
guaranteed over the –40°C to 125°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.
●
●
●
●
●
●
●
1.228
MIN
320
2.5
90
0.0006
1.250
TYP
500
150
440
280
600
690
0.1
0.1
0.1
0.7
0.9
0.2
0.2
1.7
2.3
10
40
30
35
35
95
50
1
LT3470A
1.265
MAX
0.02
150
560
775
0.5
0.5
1.5
1.5
1.2
2.2
0.2
18
55
60
80
4
2
2
5
5
A
= 25°C.
UNITS
3470af
3
%/V
mV
mA
mA
mV
mV
mA
mA
μA
μA
μA
μA
μA
μA
nA
nA
μA
μA
μA
μA
ns
%
V
V
V
V
V
V