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參數(shù)資料
| 型號： | LTC3416EFE |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3.3-V CMOS 18-Bit Universal Bus Driver with 3-State Outputs 56-SSOP -40 to 85 |
| 中文描述： | 8 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 4.4 MM, PLASTIC, TSSOP-20 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 238K |
| 代理商： | LTC3416EFE |
LTC3416
12
3416f
APPLICATIOU
W
U
U
in dropout, the heat dissipated may exceed the maximum
junction temperature of the part. If the junction tempera-
ture reaches approximately 150
°
C, both power switches
will be turned off and the SW node will become high
impedance.
To avoid the LTC3416 from exceeding the maximum
junction temperature, the user will need to do some
thermal analysis. The goal of the thermal analysis is to
determine whether the power dissipated exceeds the
maximum junction temperature of the part. The tempera-
ture rise is given by:
T
R
= (P
D
)(
θ
JA
)
where P
D
is the power dissipated by the regulator and
θ
JA
is the thermal resistance from the junction of the die to the
ambient temperature. For the 20-lead exposed TSSOP
package, the
θ
JA
is 38
°
C/W.
The junction temperature, T
J
, is given by:
T
J
= T
A
+ T
R
where T
A
is the ambient temperature.
Note that at higher supply voltages, the junction tempera-
ture is lower due to reduced switch resistance (R
DS(ON)
).
To maximize the thermal performance of the LTC3416, the
Exposed Pad should be soldered to a ground plane.
Checking Transient Response
The regulator loop response can be checked by looking at
the load transient response. Switching regulators take
several cycles to respond to a step in load current.
When a load step occurs, V
OUT
immediately shifts by an
amount equal to
I
LOAD
(ESR), where ESR is the effective
series resistance of C
OUT
.
I
LOAD
also begins to charge or
discharge C
OUT
generating a feedback error signal used by
the regulator to return V
OUT
to its steady-state value.
During this recovery time, V
OUT
can be monitored for
overshoot or ringing that would indicate a stability prob-
lem. The I
TH
pin external components and output capaci-
tor shown in figure 1a will provide adequate compensation
for most applications.
Design Example
As a design example, consider using the LTC3416 in an
application with the following specifications: V
IN
= 3.3V,
V
OUT1
= 1.8V, V
OUT2
= 2.5V, I
OUT1(MAX)
= I
OUT2(MAX)
= 4A,
f = 1MHz. V
OUT1
and V
OUT2
must track when powering up
and powering down.
First, calculate the timing resistor:
R
k
k
OSC
=
=
3 08 10
1 10
10
298
11
6
.
–
Use a standard value of 294k
. Next, calculate the induc-
tor values for about 40% ripple current:
L
V
1 6
.
1 6
MHz
1
A
V
V
V
V
H
L
V
MHz
1
A
H
1
1 8
.
1
1 8
3 3
2 5
3 3
.
0 51
.
2
2 5
1
0 38
.
=
=
=
μ
=
μ
–
.
.
–
.
Using a 0.47
μ
H inductor for both results in maximum
ripple currents of:
=
μ
=
=
V
=
μ
I
V
MHz
1
H
V
V
V
A
I
V
MHz
1
H
A
L
L
1
2
1 8
.
0 47
.
0 47
2 5
1
1 8
3 3
2 5
3 3
.
1 74
.
1
1 29
.
–
.
.
–
.
C
OUT1
and C
OUT2
will be selected based on the ESR that is
required to satisfy the output voltage ripple requirement
and the bulk capacitance needed for loop stability. For this
design, two 100
μ
F ceramic capacitors will be used at each
output.
C
IN1
and C
IN2
should be sized for a maximum current
rating of:
I
A
V
V
V
V
V
V
V
V
A
I
A
A
RMS
RMS
RMS
RMS
1
2
4
1 8
3 3
2 5
3 3
.
3 3
1 8
3 3
2 5
.
1
1 99
.
4
1
1 71
.
=
=
=
=
.
.
.
.
–
.
.
–
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