參數(shù)資料
型號： LTC1174-5
廠商： Linear Technology Corporation
英文描述： High Efficiency Step-Down and Inverting DC/DC Converter(高效率,步降DC/DC變換器)
中文描述： 高效率降壓和倒轉(zhuǎn)DC / DC轉(zhuǎn)換器（高效率，步降直流/直流變換器）
文件頁數(shù)： 10/20頁
文件大?。?/td> 246K
代理商： LTC1174-5
10
LTC1174
LTC1174-3.3/LTC1174-5
Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
LTC1174. These items are also illustrated graphically in
the layout diagram in Figure 7. Check the following in your
layout:
1. Is the Schottky catch diode closelyconnected between
ground (Pin 4) and switch (Pin 5)
2. Is the “+” plate of C
IN
closelyconnected to V
IN
(Pin 6)
This capacitor provides the AC current to the internal
P-channel MOSFET.
3. Is the 0.1
μ
F V
IN
decoupling capacitor closelyconected
between V
IN
(Pin 6) and ground (Pin 4) This capacitor
carries the high frequency peak currents.
4. Is the SHUTDOWN (Pin 8) actively pulled to V
IN
during
normal operation The SHUTDOWN pin is high imped-
ance and must not be allowed to float.
5. Is the I
PGM
(Pin 7) pulled either to V
IN
or ground The
I
PGM
pin is high impedance and must not be allowed
to float.
Figure 7. LTC1174 Layout Diagram (See Board Layout Checklist)
Figure 6. Preventing Absolute Maximum
Ratings from Being Exceeded
APPLICATIOU
Prevention against latchup can be accomplished by sim-
ply connecting a Schottky diode across the SW and V
IN
pins as shown in Figure 6. The diode will normally be
reverse biased unless V
IN
is pulled below V
OUT
at which
time the diode will clamp the (V
OUT
– V
IN
) potential to less
than the 0.6V required for latchup. Note that a low leakage
Schottky should be used to minimize the effect on no-load
supply current. Schottky diodes such as MBR0530, BAS85
and BAT84 work well. Another more serious effect of the
protection diode leakage is that at no load with nothing to
provide a sink for this leakage current, the output voltage
can potentially float above the maximum allowable toler-
ance. To prevent this from occuring, a resistor must be
connected between V
OUT
and ground with a value low
enough to sink the maximum possible leakage current.
W
U
U
1174 F06
V
IN
V
OUT
LATCHUP
PROTECTION
SCHOTTKY
SW
LTC1174
LTC1174-3.3
LTC1174-5
+
3
LTC1174
2
SW
R1
8
7
6
1
5
4
L
V
OUT
D
1174 F07
OUTPUT DIVIDER
REQUIRED WITH
ADJUSTABLE
VERSION ONLY
0.1
μ
F
LB
OUT
LB
IN
GND
SHUTDOWN
I
PGM
V
IN
R2
BOLD LINES INDICATE
HIGH CURRENT PATH
V
IN
C
IN
C
OUT
V
OUT
(V
FB
)
+
+
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