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參數(shù)資料
| 型號： | 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)： | 12/24頁 |
| 文件大?。?/td> | 335K |
| 代理商： | LTC1553 |
12
LTC1553
Table 4. Recommended Minimum R
IMAX
Resistor (k
) vs Maximum Operating Load Current and External MOSFET Q1
MAXIMUM OPERATING
LOAD CURRENT (A)
SUD50N03-10
(TWO IN PARALLEL)
12
2.4
14
2.7
16
3.0
18
3.6
20
3.9
SUD50N03-10
MTD20N03HDL
(TWO IN PARALLEL)
2.2
2.7
3.0
3.3
3.6
MTD20N03HDL
4.3
5.1
6.2
6.8
7.5
1.2
1.3
1.5
1.8
2.0
APPLICATIO
S I
FOR
ATIO
U
W
U
U
OUTEN and Thermistor Input
The LTC1553 includes a low power shutdown mode,
controlled by the logic at the OUTEN pin. A high at OUTEN
allows the part to operate normally. A low level at OUTEN
stops all internal switching, pulls COMP and SS to ground
internally and turns Q1 and Q2 off. OT and PWRGD are
pulled low, and FAULT is left floating. In shutdown, the
LTC1553 quiescent current will drop to about 130
μ
A. The
remaining current is used to keep the thermistor sensing
circuit at OUTEN alive. Note that the leakage current of
the external MOSFETs may add to the total shutdown
current consumed by the circuit, especially at elevated
temperature.
OUTEN is designed with multiple thresholds to allow it to
also be utilized for over-temperature protection. The power
MOSFET operating temperature can be monitored with an
external negative temperature coefficient (NTC) thermistor
mounted next to the external MOSFET which is expected
to run the hottest––often the high-side device, Q1. Elec-
trically, the thermistor should form a voltage divider with
another resistor, R1, connected to V
CC
. Their midpoint
should be connected to OUTEN (see Figure 6). As the
temperature increases, the OUTEN pin voltage is reduced.
Under normal operating conditions, the OUTEN pin should
stay above 2V. All circuits will function normally, and the
OT pin will remain in a high state. If the temperature gets
abnormally high, the OUTEN pin voltage will eventually
drop below 2V. OT will switch to a logic low, providing an
over-temperature warning to the system. As OUTEN drops
below 1.7V, the LTC1553 disables both FET drivers. If
Figure 6. OUTEN Pin as a Thermistor Input
Q1
Q2
L
O
V
OUT
1553 F06
C
OUT
5.6k
V
IN
V
CC
V
CC
R1
R2
NTC THERMISTOR
MOUNT IN CLOSE
THERMAL PROXIMITY
TO Q1
LTC1553
PENTIUM II
SYSTEM
G1
G2
OT
OUTEN
+
OUTEN is less than 1.2V, the LTC1553 will enter shutdown
mode. To activate any of these three modes, the OUTEN
voltage must drop below the respective threshold for
longer than 30
μ
s.
Clock Synchronization
The internal oscillator can be synchronized to an external
clock by applying the external clocking signal to the
OUTEN pin. The synchronizing range extends from the
initial operating frequency up to 500kHz. If the external
frequency is much higher than the natural free-running
frequency, the peak-to-peak sawtooth amplitude within
the LTC1553 will decrease. Since the loop gain is inversely
proportional to the amplitude of the sawtooth, the com-
pensation network may need to be adjusted slightly. Note
that the temperature sensing circuitry does not operate
when external synchronization is used.
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