参数资料
型号: LT3641EUFD#PBF
厂商: Linear Technology
文件页数: 20/28页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ DL 28QFN
标准包装: 73
类型: 降压(降压)
输出类型: 可调式
输出数: 2
输出电压: 可调至 1.265V,可调至 0.6V
输入电压: 2.5 V ~ 42 V
PWM 型: 电流模式,混合
频率 - 开关: 500kHz ~ 2MHz
电流 - 输出: 1.3A,1.1A
同步整流器: 两者兼有
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 28-WFQFN 裸露焊盘
包装: 管件
供应商设备封装: 28-QFN(4x5)
LT3641
APPLICATIONS INFORMATION
The WDO is open-drain output with weak internal pull-up,
similar to the RST pins.
The delay period corresponding to 33 cycles on CWDT, the
watchdog lower boundary (4 cycles on CWDT), and the
watchdog upper boundary (64 cycles on CWDT) are all
related and set by a capacitor, C WDT , between the CWDT
pin and ground:
CWDT
CPOR
FB2
FB1
RST2
WD STARTS
WD STARTS
64 CYCLES 64 CYCLES
64 CYCLES   64 CYCLES
= t WDU ? ?
? 64 ? ?
t DLY
? 33 ?
RST1
20ms/DIV
(8a)
3641 F09a
t WDL =
t WDU
16
t WDU = C WDT ? 37 ? 10 6 ? ?
? s ?
? F ?
CWDT
CPOR
The accuracy of the watchdog timer will be limited by
the accuracy and temperature coef?cient of the capacitor
C WDT . Extra parasitic capacitance on the CWDT pin, such
as probe capacitance, can affect the watchdog timer.
WDI
WDO
Figure 8a shows the power-on reset timing. Having FB1
or FB2 high starts the CPOR oscillator. After t RST , the cor-
responding RST is released. When both RST1 and RST2
are released, the CWDT oscillator starts. Figure 8b shows
the watchdog waveform with the WDI period between t WDL
and t WDU . The WDI falling edge resets the CWDT oscillator.
The CPOR oscillator is disabled and WDO remains high.
Figure 8c shows the watchdog waveform with the WDI
period longer than t WDU . WDO is asserted for a period of
t RST when the watchdog upper boundary, t WDU , expires.
The watchdog function can be disabled by tying WDE
above its threshold. In this case, the CWDT pin can be left
CWDT
CPOR
WDI
WDO
1ms/DIV
(8b)
50ms/DIV
3641 F09b
3640 F09c
?oating. If neither the watchdog function nor the power-
on reset function is used, both the CWDT and CPOR pin
can be left ?oating.
(8c)
Figure 8. Power-On Reset and Watchdog Timing
The accuracy of the CPOR and CWDT capacitors determine
the accuracy of the power-on reset timer and watchdog
timer. The COG or NPO type of ceramic capacitors have
zero temperature coef?cient and good aging characteris-
tics. Use COG or NPO type of capacitors with ?at DC bias
characteristic up to 1.5V on the CPOR and CWDT pins.
3641fa
20
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