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| 型号： | MAX8730ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 27/29页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATTERY 28-TQFN |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 多化学 |
| 电源电压： | 8 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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Low-Cost Battery Charger
REF
R7
R14
ICTL
R8
Figure 12. ICTL Foldback Current Adjustment
For typical applications, choose t Delay = 20μs
(depends on the p-MOSFET selected for the PDS
switch).
The following components can be used for a 10A sys-
tem short-current design:
R10 = 8.66k ?
C6 = 0.1μF
R15 = 7.15k ?
C13 = 2.7nF
Foldback Current
At low duty cycles, most of the charge current is con-
ducted through the Schottky diode (D1). To reduce the
requirements of the Schottky diode, the MAX8730 has a
foldback charge current feature. When the battery volt-
age falls below 5 x V RELTH , ICTL sinks 6μA. Add a
series resistor to ICTL to adjust the charge current fold-
back, as shown in Figure 12:
Good PC board layout is required to achieve specified
noise immunity, efficiency, and stable performance.
The PC board layout artist must be given explicit
instructions—preferably, a sketch showing the place-
ment of the power-switching components and high-
current routing. Refer to the PC board layout in the
MAX8730 evaluation kit for examples.
Use the following step-by-step guide:
1) Place the high-power connections first, with their
grounds adjacent:
? Minimize the current-sense resistor trace lengths,
and ensure accurate current sensing with Kelvin
connections.
? Minimize ground trace lengths in the high-current
paths.
? Minimize other trace lengths in the high-current
paths.
? Use > 5mm wide traces in the high-current
paths.
? Connect to the input capacitors directly to the
source of the high-side MOSFET (10mm max
length). Place the input capacitor between the
input current-sense resistor and the source of the
high-side MOSFET.
2) Place the IC and signal components. Quiet connec-
tions to REF, CCV, CCI, CCS, ACIN, SWREF, and
LDO SRC should be returned to a separate ground
(GND) island. There is very little current flowing in
these traces, so the ground island need not be very
large. When placed on an inner layer, a sizable
ground island can help simplify the layout because
the low current connections can be made through
vias. The ground pad on the backside of the pack-
age should be the star connection to this quiet
??
x V REF ? FOLDBACK
?? ?
?
R1 4 =
1 ? R8
6 μ A ? R7 + R8
I x R S2 x 3.6V ?
1 3 5m V
R8 x R7
R7 + R8
ground island.
3) Keep the gate drive trace (DHI) and SRC path as
short as possible (L < 20mm), and route them away
from the current-sense lines and REF. Bypass DHIV
directly to the source of the high-side MOSFET.
Layout and Bypassing
Bypass SRC, ASNS, LDO, DHIV, and REF as shown in
Figure 1.
These traces should also be relatively wide (W >
1.25mm).
4) Place ceramic bypass capacitors close to the IC.
The bulk capacitors can be placed further away.
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8730EVKIT | 制造商:Maxim Integrated Products 功能描述:LOW COST BATTERY CHARGER - Rail/Tube |
| MAX8731AETI+ | 功能描述:电池管理 SMBus Level 2 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 |
| MAX8731AETI+T | 功能描述:电池管理 SMBus Level 2 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 |
| MAX8731AEVKIT+ | 功能描述:电源管理IC开发工具 MAX8731A 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 |
| MAX8731AEVSYS | 功能描述:电池管理 Evaluation System for the MAX8731A (includes an EVKit and the Maxim SMBUSMON2 board) 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 |
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