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LT3470ETS8 Datasheet

  • LT3470ETS8

  • Micropower Buck Regulator with Integrated Boost and Catch Di...

  • 16頁

  • Linear

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LT3470
ELECTRICAL CHARACTERISTICS
The
鈼?/div>
denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25擄C.
V
IN
= 10V, V
SHDN
= 10V, V
BOOST
= 15V, V
BIAS
= 3V unless otherwise specified.
PARAMETER
Catch Schottky Drop
Catch Schottky Reverse Leakage
Boost Schottky Drop
Boost Schottky Reverse Leakage
Minimum Boost Voltage (Note 4)
BOOST Pin Current
SHDN Pin Current
SHDN Input Voltage High
SHDN Input Voltage Low
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
The LT3470E is guaranteed to meet performance specifications
from 0擄C to 70擄C. Specifications over the 鈥?0擄C to 85擄C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT3470I specifications are
guaranteed over the 鈥?0擄C to 125擄C temperature range.
I
SW
= 100mA
V
SHDN
= 2.5V
2.5
0.2
CONDITIONS
I
SH
= 100mA
V
SW
= 10V
I
SH
= 30mA
V
SW
= 10V, V
BIAS
= 0V
鈼?/div>
MIN
TYP
630
0.2
650
0.2
1.7
7
1
MAX
775
2
775
2
2.2
12
5
UNITS
mV
碌A(chǔ)
mV
碌A(chǔ)
V
mA
碌A(chǔ)
V
V
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.
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency, V
OUT
= 3.3V
90
80
L = TOKO D52LC 47碌H
T
A
= 25擄C
V
IN
= 12V
V
IN
= 7V
90
80
EFFICIENCY (%)
70
V
IN
= 24V
60
50
L = TOKO D52LC 47碌H
T
A
= 25擄C
V
IN
= 12V
EFFICIENCY (%)
70
V
IN
= 24V
60
50
40
30
0.1
V
IN
= 36V
V
FB
(V)
10
1
LOAD CURRENT (mA)
U W
100
3470 G01
Efficiency, V
OUT
= 5V
1.260
V
FB
vs Temperature
1.255
V
IN
= 36V
1.250
1.245
40
30
0.1
10
1
LOAD CURRENT (mA)
100
3470 G02
1.240
鈥?0
鈥?5
75
0
25
50
TEMPERATURE (擄C)
100
125
3470 G03
3470f
3

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