參數(shù)資料
型號(hào)： LTC3442EDE
廠商： Linear Integrated Systems
英文描述： Micropower Synchronous Buck-Boost DC/DC Converter with Automatic Burst Mode Operation
中文描述： 微功率同步降壓升壓與自動(dòng)突發(fā)模式的DC / DC轉(zhuǎn)換器操作
文件頁(yè)數(shù)： 10/20頁(yè)
文件大?。?/td> 332K
代理商： LTC3442EDE
LTC3442
10
3442f
Boost Region (V
IN
< V
OUT
)
Switch A is always on and switch B is always off during this
mode. When the internal control voltage, V
CI
, is above
voltage V3, switch pair CD will alternately switch to pro-
vide a boosted output voltage. This operation is typical to
a synchronous boost regulator. The maximum duty cycle
of the converter is limited to 88% typical and is reached
when V
CI
is above V4.
BURST MODE OPERATION
Burst Mode operation occurs when the IC delivers energy
to the output until it is regulated and then goes into a sleep
mode where the outputs are off and the IC is consuming
only 35
μ
A of quiescent current from V
IN
. In this mode the
output ripple has a variable frequency component that
depends upon load current, and will typically be about 2%
peak-to-peak. Burst Mode operation ripple can be reduced
slightly by using more output capacitance (47
μ
F or greater).
Another method of reducing Burst Mode operation ripple
is to place a small feed-forward capacitor across the upper
resistor in the V
OUT
feedback divider network (as in Type
III compensation).
During the period where the device is delivering energy to
the output, the peak switch current will be equal to 900mA
typical and the inductor current will terminate at zero
current for each cycle. In this mode the typical maximum
average output current is given by:
I
V
V
V
A
OUT MAX BURST
(
IN
OUT
IN
)
0.
≈
+
Note that the peak efficiency during Burst Mode operation
is less than the peak efficiency during fixed frequency
V
IN
8
because the part enters full-time 4-switch mode (when
servicing the output) with discontinuous inductor current
as illustrated in Figures 3 and 4. During Burst Mode
operation, the control loop is nonlinear and cannot utilize
the control voltage from the error amp to determine the
control mode, therefore full-time 4-switch mode is re-
quired to maintain the Buck/Boost function. The efficiency
below 1mA becomes dominated primarily by the quies-
cent current. The Burst Mode operation efficiency is given
by:
EFFICIENCY
n I
μ +
35
LOAD
LOAD
where n is typically 82% during Burst Mode operation.
Automatic Burst Mode Operation Control
Burst Mode operation can be automatic or manually
controlled with a single pin. In automatic mode, the IC will
enter Burst Mode operation at light load and return to fixed
frequency operation at heavier loads. The load current at
which the mode transition occurs is programmed using a
single external resistor from the BURST pin to ground,
according to the following equations:
Enter Burst Mode: I
17.6
R
22.4
R
BURST
Leave Burst Mode: I
BURST
=
=
where R
BURST
is in k
and I
BURST
is the load transition
Figure 3. Inductor Charge Cycle During Burst Mode Operation
Figure 4. Inductor Discharge Cycle During Burst Mode Operation
9
V
IN
A
4
SW1
5
GND
6
SW2
L
–
+
8
V
OUT
D
C
900mA
I
I
0mA
3442 F04
T2
B
dI
dt
V
OUT
L
≈
–
9
A
4
SW1
5
GND
6
SW2
L
+
–
V
OUT
D
C
900mA
I
I
0mA
3442 F03
T1
B
dI
dt
V
IN
L
≈
OPERATIOU
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