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| 型号： | MAX1904ETJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 27/33页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR PWR SPLY LN 32-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 控制器，笔记本电脑电源系统 |
| 输入电压： | 4.2 V ~ 30 V |
| 输出数： | 4 |
| 输出电压： | 2.5 V ~ 5 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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500kHz Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
performance. 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
connections (REF, SS, GND), and the inner layers for
an uninterrupted ground plane. Use the following step-
by-step guide:
1) Place the high-power components (Figure 1, C1, C3,
C4, Q1, Q2, L1, and R1) first, with their grounds
adjacent.
? Priority 1: Minimize current-sense resistor trace
lengths and ensure accurate current sensing with
Kelvin connections (Figure 9).
? Priority 2: Minimize ground trace lengths in the
high-current paths (discussed below).
? Priority 3: Minimize other trace lengths in the high
current paths.
Use >5mm-wide traces
CIN to high-side MOSFET drain: 10mm max
length
Rectifier diode cathode to low-side MOSFET:
5mm max length
LX node (MOSFETs, rectifier cathode, inductor):
15mm max length
Ideally, surface-mount power components are butted up
to one another with their ground terminals almost touch-
ing. These high-current grounds are then connected to
each other with a wide filled zone of top-layer copper so
they don ’ t go through vias. The resulting top layer “ sub-
ground-plane ” is connected to the normal inner-layer
ground plane at the output ground terminals, which
ensures that the IC ’ s analog ground is sensing at the sup-
ply ’ s output terminals without interference from IR drops
HIGH-CURRENT PATH
SENSE RESISTOR
MAX1901/MAX1902/MAX1904
Figure 9. Kelvin Connections for the Current-Sense Resistors
and ground noise. Other high-current paths should also
be minimized, but focusing primarily on short ground and
current-sense connections eliminates about 90% of all PC
board layout problems.
2) Place the IC and signal components. Keep the main
switching nodes (LX nodes) away from sensitive
analog components (current-sense traces and REF
capacitor). Place the IC and analog components on
the opposite side of the board from the power-
switching node. Important: the IC must be no more
than 10mm from the current-sense resistors. Keep
the gate-drive traces (DH_, DL_, and BST_) shorter
than 20mm and route them away from CSH_, CSL_,
and REF.
3) Use a single-point star ground where the input
ground trace, power ground (sub-ground-plane), and
normal ground plane meet at the supply ’ s output
ground terminal. Connect both IC ground pins and all
IC bypass capacitors to the normal ground plane.
______________________________________________________________________________________
27
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1906EVKIT | 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 |
| MAX1906SEEE | 功能描述:电池管理 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 |
| MAX1906SEGE | 功能描述:电池管理 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 |
| MAX1906VEEE | 功能描述:电池管理 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 |
| MAX1906VEGE | 功能描述:电池管理 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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