参数资料
型号: LTC3736EUF-1
厂商: Linear Technology
文件页数: 19/28页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 24-QFN
标准包装: 91
系列: PolyPhase®
PWM 型: 电流模式
输出数: 2
频率 - 最大: 825kHz
占空比: 100%
电源电压: 2.75 V ~ 9.8 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 24-WFQFN 裸露焊盘
包装: 管件
LTC3736-1
APPLICATIO S I FOR ATIO
The ramp time for V OUT2 to rise from 0V to its final value
is:
V OUT2 when using the TRACK pin. If no tracking function
is desired, then the TRACK pin may be tied to V IN . How-
R TRACKA
t SS 2 = t SS 1 ?
R 1 A
For coincident tracking,
V OUT2F
t SS 2 = t SS 1 ?
V OUT 1 F
?
R 1 A + R 1 B
R TRACKA + R TRACKB
ever, in this situation there would be no (internal nor
external) soft-start on V OUT2 .
When using tracking with spread spectrum operation
enabled, the tracking resistors R TRACKA and R TRACKB
should have value at least 10 times smaller than corre-
sponding feedback resistors R2A and R2B.
where V OUT1F and V OUT2F are the final, regulated values of
V OUT1 and V OUT2 . V OUT1 should always be greater than
Fault Condition: Short Circuit and Current Limit
To prevent excessive heating of the bottom MOSFET,
foldback current limiting can be added to reduce the
V OUT1
V OUT2
current in proportion to the severity of the fault.
R1B
LTC3736-1
R2B
Foldback current limiting is implemented by adding di-
R TRACKB
R1A
V FB1
TRACK
V FB2
R2A
odes D FB1 and D FB2 between the output and the I TH pin as
shown in Figure 9. In a hard short (V OUT = 0V), the current
will be reduced to approximately 50% of the maximum
R TRACKA
37361 F08a
output current.
Figure 8a. Using the TRACK Pin
V OUT1
Low Supply Operation
Although the LTC3736-1 can function down to below
2.4V, the maximum allowable output current is reduced as
V IN decreases below 3V. Figure 10 shows the amount of
V OUT
V OUT2
1/2 LTC3736-1
I TH
V FB
R2
R1
+
D FB1
D FB2
37361 F09
TIME
Figure 9. Foldback Current Limiting
(8b) Coincident Tracking
105
V OUT1
100
95
V REF
MAXIMUM
SENSE VOLTAGE
90
V OUT2
85
80
TIME
37361 F08b,c
75
2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0
(8c) Ratiometric Tracking
INPUT VOLTAGE (V)
37361 F10
Figures 8b and 8c. Two Different Modes of Output
Voltage Tracking
Figure 10. Line Regulation of V REF and
Maximum Sense Voltage for Low Input Supply
37361f
19
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