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参数资料
| 型号： | LTC3105EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/18页 |
| 文件大小： | 0K |
| 描述： | IC CONV DC/DC 400MA HIEFF 10-DFN |
| 标准包装： | 2,500 |
| 应用： | 转换器，能量收集 |
| 输入电压： | 0.23 V ~ 5 V |
| 输出数： | 1 |
| 输出电压： | 1.5 V ~ 5.25 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 带卷 (TR) |
LTC3105
APPLICATIONS INFORMATION
V OUT = 1.004V ? ?
+ 1 ?
V LDO = 1.004V ? ?
+ 1 ?
Step-UpConverterFeedbackConfiguration
A resistor divider connected between the V OUT and FB pins
programs the step-up converter output voltage, as shown
in Figure 2. An optional 22pF feedforward capacitor, C FF1 ,
can be used to reduce output ripple and improve load
transient response. The equation for V OUT is:
? R1 ?
? R2 ?
LDO Regulator Feedback Configuration
Two methods can be used to program the LDO output
voltage, as shown in Figure 3. A resistor divider connected
between the LDO and FBLDO pins can be used to program
the LDO output voltage. The equation for the LDO output
voltage is:
? R3 ?
? R4 ?
Alternatively, the FBLDO pin can be connected directly to
GND. In this configuration, the LDO is internally set to a
nominal 2.2V output.
MPPC Threshold Configuration
The MPPC circuit controls the inductor current to main-
tain V IN at the voltage on the MPPC pin. The MPPC pin
voltage is set by connecting a resistor between the MPPC
pin and GND, as shown in Figure 4. The MPPC voltage is
determined by the equation:
V MPPC = 10μA ? R MPPC
In photovoltaic cell applications, a diode can be used to
set the MPPC threshold so that it tracks the cell voltage
over temperature, as shown in Figure 5. The diode should
be thermally coupled to the photovoltaic cell to ensure
proper tracking. A resistor placed in series with the diode
can be used to adjust the DC set point to better match
the maximum power point of a particular source if the
selected diode forward voltage is too low. If the diode is
located far from the converter inputs, a capacitor may be
required to filter noise that may couple onto the MPPC
pin, as shown in Figure 5. This method can be extended
to stacked cell sources through use of multiple series
connected diodes.
C FF1
R1
V OUT
LTC3105
FB
R MPPC
10μA
MPPC
LTC3105
R2
3105 F02
3105 F04
Figure 2. FB Configuration
Figure 4. MPPC Configuration
R3
R4
LDO
LTC3105
FBLDO
2.2V
LDO
LTC3105
FBLDO
+
V FWD
–
R MPPC
C6
10nF
10μA
MPPC
LTC3105
Figure 3. FBLDO Configuration
3105 F03
3105 F05
Figure 5. MPPC Configuration with Temperature Adjustment
3105fa
11
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