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参数资料
| 型号： | MAX8731AETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 30/32页 |
| 文件大小： | 0K |
| 描述： | IC SMBUS LVL2 BATT CHRGR 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 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 ~ 26 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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SMBus Level 2 Battery Charger
with Remote Sense
Good PCB layout is required to achieve specified noise
immunity, efficiency, and stable performance. The PCB
layout artist must be given explicit instructions—prefer-
ably, a sketch showing the placement of the power-
switching components and high-current routing. Refer to
the PCB layout in the MAX8731A evaluation kit for exam-
ples. A ground plane is essential for optimum perfor-
mance. In most applications, the circuit will be located
on a multilayer board, and full use of the four or more
copper layers is recommended. Use the top layer for
high-current connections, the bottom layer for quiet con-
nections, and the inner layers for uninterrupted ground
planes.
Use the following step-by-step guide:
1) Place the high-power connections first, with their
grounds adjacent:
a) Minimize the current-sense resistor trace
lengths, and ensure accurate current sensing
with Kelvin connections.
b) Minimize ground trace lengths in the high-cur-
rent paths.
c) Minimize other trace lengths in the high-current
paths.
Use > 5mm wide traces in the high-current
paths.
d) Connect C1 and C2 to high-side MOSFET
(10mm max length). Place the input capacitor
between the input current-sense resistor and
drain of the high-side MOSFET.
e) Minimize the LX node (MOSFETs, rectifier cath-
ode, inductor (15mm max length)). Keep LX on
one side of the PCB to reduce EMI radiation.
not go through vias. The resulting top-layer sub-
ground plane is connected to the normal inner-
layer ground plane at the paddle. Other
high-current paths should also be minimized, but
focusing primarily on short ground and current-
sense connections eliminates approximately 90%
of all PCB layout problems.
2) Place the IC and signal components. Keep the
main switching node (LX node) away from sensitive
analog components (current-sense traces and REF
capacitor).
Important: The IC must be no further than 10mm
from the current-sense resistors. Quiet connections
to REF, CCS, DAC, CCV, CCI, ACIN, and VCC
should be returned to a separate ground (GND)
island. The analog ground is separately worked
from power ground in Figure 1. 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 back-
side of the package should also be connected to
this quiet ground island.
3) Keep the gate-drive traces (DHI and DLO) as short
as possible (L < 20mm), and route them away from
the current-sense lines and REF. 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.
Place the current-sense input filter capacitors under
the part, connected directly to the GND pin.
5) Use a single-point star ground placed directly
f)
Since the return path of DHI is LX, route DHI near
LX. Optimally, LX and DHI should overlap. The
same principle is applied to DLO and PGND.
below the part at the PGND pin. Connect the power
ground (ground plane) and the quiet ground island
at this location.
g) Ideally, surface-mount power components are
flush against one another with their ground termi-
nals almost touching. These high-current
grounds are then connected to each other with a
wide, filled zone of top-layer copper, so they do
Chip Information
TRANSISTOR COUNT: 10,234
PROCESS: BiCMOS
30
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAX8731ETI+ | 制造商:Maxim Integrated Products 功能描述:CHGR MULTI-CHEM 8A 0V TO 19.2V 28TQFN - Rail/Tube |
| MAX8731ETI+T | 制造商:Maxim Integrated Products 功能描述:CHGR MULTI-CHEM 8A 0V TO 19.2V 28TQFN - Tape and Reel |
| MAX8731EVKIT | 功能描述:电池管理 SMBus Level 2 Battery Charger with Remote Sense 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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