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參數(shù)資料
| 型號(hào)： | LTC1553 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 5-Bit Programmable Synchronous Switching Regulator Controller for Pentium II Processor(用于奔騰II處理器的5位可編程同步開關(guān)穩(wěn)壓器) |
| 中文描述： | 5位可編程同步開關(guān)穩(wěn)壓器控制器的奔騰II處理器（用于奔騰2處理器的5位可編程同步開關(guān)穩(wěn)壓器） |
| 文件頁數(shù)： | 13/24頁 |
| 文件大小： | 335K |
| 代理商： | LTC1553 |
13
LTC1553
APPLICATIO
S I
FOR
ATIO
U
MOSFET Gate Drive
Power for the internal MOSFET drivers is supplied by
PV
CC
. This supply must be above the input supply voltage
by at least one power MOSFET V
GS(ON)
for efficient opera-
tion. This higher voltage can be supplied with a separate
supply, or it can be generated using a simple charge pump
as shown in Figure 7. The 84% typical maximum duty
cycle ensures sufficient off-time to refresh the charge
pump during each cycle. Figure 8 shows a tripling charge
pump, which provides additional V
GS
overdrive to the
external MOSFETs. This circuit can be useful for standard
threshold MOSFETs which demand a higher turn-on volt-
age. An 18V Zener diode (1N5248B) is recommended with
tripler charge pump designs to ensure that PV
CC
never
exceeds the LTC1553’s 20V absolute maximum PV
CC
voltage. This becomes more critical as V
IN
rises. With V
IN
= 12V, the doubler circuit of Figure 7 will also exceed the
20V limit. Figure 9 shows an alternate 17V charge pump
derived from both the 5V and 12V supplies.
If the OUTEN pin is low, G1 and G2 are both held low to
prevent output voltage undershoot. As V
CC
and PV
CC
power up from a 0V condition, an internal undervoltage
lockup circuit prevents G1 and G2 from going high until
V
CC
reaches about 3.5V. If V
CC
powers up while PV
CC
is at
ground potential, the SS is forced to ground potential
internally. SS clamps the COMP pin low and prevents the
drivers from turning on. On power-up or recovery from
thermal shutdown, the drivers are designed such that G2
is held low until G1 first goes high.
W
U
U
Q1
G1
20
Q2
0.1
μ
F
L
O
V
OUT
1553 F07
C
OUT
C
IN
V
IN
PV
CC
1N5248B
18V
1N5817
OPTIONAL FOR V
IN
> 5V
G2
1
LTC1553
2
+
+
Figure 7. Doubling Charge Pump
Power MOSFETs
Two N-channel power MOSFETs are required for most
LTC1553 circuits. They should be selected based prima-
rily on threshold and on-resistance considerations. The
required MOSFET threshold should be determined based
on the available power supply voltages and/or the com-
plexity of the gate driver charge pump scheme. In 5V input
designs where a 12V supply is used to power PV
CC
,
standard MOSFETs with R
DS(ON)
specified at V
GS
= 5V or
6V can be used with good results. However, logic level
devices will improve efficiency. The current drawn from
the 12V supply varies with the MOSFETs used and the
LTC1553 operating frequency, but is generally less than
50mA.
Figure 9. 17V Charge Pump for V
IN
= 12V
Q1
10
Q2
0.1
μ
F
L
O
V
OUT
1553 F09
C
OUT
V
IN
12V
C
VCC
1N5248B
18V
1N5817
V
CC
5V
LTC1553
C
IN
G1
20
PV
CC
G2
1
2
V
CC
5
+
+
Q1
Q2
0.1
μ
F
0.1
μ
F
10
μ
F
L
O
V
OUT
1553 F08
C
OUT
C
IN
V
IN
1N5248B
18V
1N5817
LTC1553
1N5817
1N5817
+
G1
20
PV
CC
G2
1
2
+
+
Figure 8. Tripling Charge Pump
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