收藏本站
MAX17710
Energy-Harvesting Charger and Protector
The C1 1nF capacitor acts as a voltage-level feed for-
ward to increase the responsiveness of the divider circuit
as the harvest source capacitor is discharged. The mini-
mum voltage is defined as:
CHG
V HARVEST-OFF ~= V HARVEST-ON - (FB ON - FB OFF )
V HARVEST-OFF ~= V HARVEST-ON - 0.5V (typ)
0.1μF
ZLLS410TA
MAX17710
where V HARVEST-OFF is the lowest voltage of the harvest
source capacitor during boost.
Because of the divider on the FB pin, the voltage seen by
the LX pin inductor is higher than the typical circuit. The
1.0V TO 2.0V
CHARGE
SOURCE
47μF
C1
1nF
R2
L1
LX
inductor must be resized so that the LX pin current limits
are not exceeded:
LX Inductor = V HARVEST-ON x t BOOST-ON /LX IMAX =
V HARVEST-ON x (8.5 x 10 -7 )
All other components are selected as normal.
Energy-Harvesting Design Approaches
When designing an optimal energy harvest system,
there are three types of design approaches: linear har-
vest, boost harvest, and maximum-power-point tracking
(MPPT). In harvesting applications, it is very critical to
not discharge the cell when charging is failing. When
the harvesting power is low enough, eventually the sys-
tem discharges the cell rather than charges. This is the
break-even point of the harvester. For linear harvesting,
this break-even point is lower because the required
quiescent current is less. However, for boost harvesting,
the breakeven threshold is 1 F A. While an MPPT system
can utilize the harvesting source more intelligently in
high-power situations, it inevitably results in higher qui-
escent current and a poorer break-even threshold. MPPT
systems must measure the current and voltage, multiply
to determine power, and make decisions to improve the
power. These required measurements automatically
significantly increase the quiescent current budget
by tens of μA . Figure 4 shows energy-harvesting modes
of operation vs. charge efficiency.
LDO Output Operation
The device regulates voltage from the cell to a load
circuit on the REG pin through an LDO regulator. The
regulator can be configured for 3.3V, 2.3V, or 1.8V opera-
tion. The LDO supports loads up to 75mA (high-current
mode). For lighter load applications, a low-power mode
of operation reduces the quiescent current drain on the
cell. A UVLO circuit prevents the regulator from start-
ing up or disabling the regulator when active if the cell
becomes overdischarged.
Maxim Integrated
FB
R1
500k I
Figure 3. FB Divider Circuit to Improve Boost Efficiency for
Charge Sources Between 1.0V and 2.0V
MPPT
(MAX POWER
TRACKING)
BOOST HARVEST
LINEAR
HARVEST
BREAK-EVEN
THRESHOLDS
POWER FROM HARVEST SOURCE
Figure 4. Energy-Harvesting Modes of Operation vs. Charge
Efficiency
12
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
MAX19000EVKIT+ EVAL KIT MAX19000
MAX19710EVKIT+ EVAL KIT FOR MAX19710
MAX1978EVKIT EVAL KIT MAX1978
MAX3100EVKIT+ KIT EVAL FOR MAX3100
MAX3160EEVKIT+ EVAL KIT FOR MAX3160E
MAX3161EEVKIT+ EVAL KIT FOR MAX3161E
MAX31855EVKIT# KIT EVAL FOR MAX31855
MAX3223EEVKIT+ EVALUATION KIT MAX3223
相关代理商/技术参数
MAX17710EVKIT+ 功能描述:电源管理IC开发工具 MAX17710 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
MAX17710G+T 功能描述:电池管理 uPower Battery Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel
MAX17710G+U 功能描述:电源管理IC开发工具 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
MAX17710GB+ 功能描述:电源管理IC开发工具 uPower Battery Charger/Protector RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
MAX17710GB+T 功能描述:电源管理IC开发工具 uPower Battery Charger/Protector RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
MAX17710GB20EVKIT# 功能描述:电源管理IC开发工具 MAX17710 EVAL KIT W/ MEC201 CELL RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
MAX17710GBEVKIT# 功能描述:电源管理IC开发工具 MAX17710 EVAL KIT RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
MAX17711EVKIT+ 制造商:Maxim Integrated Products 功能描述:AMD SVI1 CPU CONTROLLER 3PHASE - Boxed Product (Development Kits)