參數(shù)資料
型號(hào): LT3430IFE-1
廠商: LINEAR TECHNOLOGY CORP
元件分類(lèi): 穩(wěn)壓器
英文描述: 6.5 A SWITCHING REGULATOR, 120 kHz SWITCHING FREQ-MAX, PDSO16
封裝: 4.40 MM, PLASTIC, TSSOP-16
文件頁(yè)數(shù): 19/28頁(yè)
文件大小: 321K
代理商: LT3430IFE-1
LT3430/LT3430-1
26
34301fa
APPLICATIONS INFORMATION
value equal to the peak-to-peak triangular waveform of the
inductor. The low output ripple design in Figure 15 places
the input capacitor between VIN and the regulated negative
output. This placement of the input capacitor signicantly
reduces the size required for the output capacitor (versus
placing the input capacitor between VIN and ground).
The peak-to-peak ripple current in both the inductor and
output capacitor (assuming continuous mode) is:
IP-P
P-P
=
==
+
++
=
DC V
fL
DC
Duty Cycle
VV
V
I
RMS
I
IN
OUT
F
OUT
IN
F
COUT
()
12
The output ripple voltage for this conguration is as low
as the typical buck regulator based predominantly on the
inductor’s triangular peak-to-peak ripple current and the
ESR of the chosen capacitor (see Output Ripple Voltage
in Applications Information).
Diode Current
Average diode current is equal to load current. Peak diode
current will be considerably higher.
Peak diode current:
Continuous Mode
I
VV
V
VV
Lf V
V
Discontinuous Mode
IV
Lf
OUT
IN
OUT
IN
OUT
IN
OUT
=
+
=
()
(
)(
)
()( )(
)
()(
)
()( )
2
Keep in mind that during start-up and output overloads,
average diode current may be much higher than with nor-
mal loads. Care should be used if diodes rated less than
1A are used, especially if continuous overload conditions
must be tolerated.
BOOST
VIN
6
2, 5
10
12
30BQ060
20.5k
VOUT
3.3V
2A
3, 4
15
14
11
220pF
0.022
F
*FOR INPUT VOLTAGES BELOW 7.5V, SOME RESTRICTIONS MAY APPLY
1, 8, 9, 16
LT3430-1
SHDN
SYNC
SW
BIAS
FB
VC
GND
1.5
F
100
F 10V
SOLID
TANTALUM
2 IN PARALLEL
68
H
MMSD914TI
12.1k
3430 F16
4.7
F
100V
ON
OFF
VIN
5.5V*
TO 60V
+
3.3k
3.3V, 2A Buck Converter
TYPICAL APPLICATION
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