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参数资料
| 型号： | MAX17710G+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/18页 |
| 文件大小： | 0K |
| 描述： | IC ENERGY HARVEST MNGR 12UTDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 应用： | 能量收集 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-UFDFN 裸露焊盘 |
| 供应商设备封装： | 12-UTDFN-EP（3x3） |
| 包装： | 标准包装 |
| 其它名称： | MAX17710G+TDKR |
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
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