参数资料
型号: LT3686HDD#TRPBF
厂商: Linear Technology
文件页数: 17/28页
文件大小: 0K
描述: IC REG BUCK ADJ 1.2A 10DFN
标准包装: 2,500
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 0.8 V ~ 30 V
输入电压: 3.6 V ~ 37 V
PWM 型: 电流模式
频率 - 开关: 300kHz ~ 2.5MHz
电流 - 输出: 1.2A
同步整流器:
工作温度: -40°C ~ 150°C
安装类型: 表面贴装
封装/外壳: 10-WFDFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 10-DFN(3x3)
LT3686
APPLICATIONS INFORMATION
the LT3686 is turned on with its EN/UVLO pin when the
output is already in regulation, then the boost capacitor
may not be fully charged. Because the boost capacitor is
charged with the energy stored in the inductor, the circuit
will rely on some minimum load current to get the boost
circuit running properly.
This minimum load will depend on the input and output
voltages, and on the arrangement of the boost circuit. The
minimum load generally goes to zero once the circuit has
started. Figure 9 shows plots of minimum load to start
and to run as a function of input voltage. In many cases
7
6
5
4
3
2
the discharged output capacitor will present a load to the
switcher which will allow it to start. At light loads, the
inductor current becomes discontinuous and the effective
duty cycle can be very high. This reduces the minimum
input voltage to approximately 400mV above V OUT . At
higher load currents, the inductor current is continuous
and the duty cycle is limited by the maximum duty cycle,
requiring a higher input voltage to maintain regulation.
As the LT3686 enters dropout, the boost capacitor voltage
will be limited by V OUT , which is fixed by the maximum duty
cycle. If the boost capacitor’s voltage during dropout falls
9
8
7
6
5
4
3
1
0
1
10
100
START
RUN
SUSTAIN
1000
2
1
0
1
10
100
START
RUN
SUSTAIN
1000
I LOAD (mA)
3686 F09a
Figure 9a. Typical Minimum Input Voltage, V OUT = 3.3V,
f = 1MHz, L = 15μH, Mode < 0.4V
7
6
I LOAD (mA)
3686 F09b
Figure 9b. Typical Minimum Input Voltage, V OUT = 5V,
f = 1MHz, L = 22μH, Mode < 0.4V
8
7
5
4
3
2
1
RUN
6
5
4
3
2
1
RUN
0
1
10
100
1000
0
1
10
100
1000
I LOAD (mA)
3686 F09c
Figure 9c. Typical Minimum Input Voltage, V OUT = 3.3V,
f = 1MHz, L = 15μH, Mode > 0.8V
I LOAD (mA)
3686 F09d
Figure 9d. Typical Minimum Input Voltage, V OUT = 5V,
f = 1MHz, L = 22μH, Mode > 0.8V
3686fc
17
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