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參數(shù)資料
| 型號： | LTC3405A-1.8 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 1.5V, 1.8V, 1.5MHz, 300mA Synchronous Step-Down Regulators in ThinSOT |
| 中文描述： | 為1.5V，1.8V的，為1.5MHz，300mA的同步降壓型穩(wěn)壓器在采用ThinSOT |
| 文件頁數(shù)： | 6/16頁 |
| 文件大小： | 235K |
| 代理商： | LTC3405A-1.8 |
6
LTC3405A-1.5/LTC3405A-1.8
sn3405a1518 3405a1518fs
FU
W
OPERATIOU
Main Control Loop
The LTC3405A Fixed output voltage series parts use a
constant frequency, current mode step-down architec-
ture. Their main (P-channel MOSFET) and synchronous
(N-channel MOSFET) switches are internal. During normal
operation, the internal top power MOSFET is turned on
each cycle when the oscillator sets the RS latch, and turned
off when the current comparator, I
COMP
, resets the RS
latch. The peak inductor current at which I
COMP
resets the
RS latch, is controlled by the output of error amplifier EA.
When the load current increases, the output voltage de-
creases which causes a slight decrease in V
FB
relative to
the 1.2V reference, which in turn, causes the EA amplifier’s
output voltage to increase until the average inductor
current matches the new load current. While the top
MOSFET is off, the bottom MOSFET is turned on until
either the inductor current starts to reverse, as indicated by
the current reversal comparator I
RCMP
, or the beginning of
the next clock cycle.
(Refer to Functional Diagram)
Comparator OVDET guards against transient overshoots
>7.8% by turning the main switch off and keeping it off
until the fault is removed.
Burst Mode Operation
The LTC3405A series parts are capable of Burst Mode
operation in which the internal power MOSFETs operate
intermittently based on load demand. To enable Burst
Mode operation, simply connect the MODE pin to GND. To
disable Burst Mode operation and enable PWM pulse
skipping mode, connect the MODE pin to V
IN
or drive it
with a logic high (V
MODE
> 1.5V). In this mode, the
efficiency is lower at light loads, but becomes comparable
to Burst Mode operation when the output load exceeds
25mA. The advantage of pulse skipping mode is lower
output ripple and less interference to audio circuitry.
+
–
+
OVDET
+
–
+
–
EA
+
–
I
RCMP
+
–
I
COMP
5
1
RUN
OSC
SLOPE
COMP
OSC
FREQ
SHIFT
1.2V
R1
LTC3405A-1.5
R1 = 110k
R2 = 440k
LTC3405A-1.8
R1 = 180k
R2 = 360k
R2
1.294V
1.2V REF
SHUTDOWN
OV
0.4V
0.65V
SLEEP
V
IN
V
OUT
6
MODE
EN
BURST
V
IN
S
R
RS LATCH
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
ANTI-
SHOOT-
THRU
Q
Q
5
4
SW
3
GND
3405A1518 BD
2
V
FB
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| LTC3405AES6 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.5MHz, 300mA Synchronous Step-Down Regulator in ThinSOT |
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