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| 型号： | MAX8671XETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 41/44页 |
| 文件大小： | 0K |
| 描述： | IC PMIC W/CHARGER 40-TQFN-EP |
| 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： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 4.1 V ~ 6.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
THM threshold adjustment can be accommodated by
changing R TB , connecting a resistor in series and/or in
parallel with the thermistor, or using a thermistor with dif-
ferent material constant ( β ). For example, a +45°C hot
threshold and 0°C cold threshold can be realized by
using a 10k Ω thermistor with a β of 4250K and connect-
ing 120k Ω in parallel. Since the thermistor resistance
near 0°C is much higher than it is near +50°C, a large
parallel resistance lowers the cold threshold, while only
slightly lowering the hot threshold. Conversely, a small
series resistance raises the cold threshold, while only
slightly raising the hot threshold. Raising R TB lowers
both the hot and cold thresholds, while lowering R TB
raises both thresholds.
PCB Layout and Routing
Good printed circuit board (PCB) layout is necessary to
achieve optimal performance. Refer to the MAX8671
evaluation kit for Maxim’s recommended layout.
Use the following guidelines for the best results:
? Use short and wide traces for high-current and dis-
continuous current paths.
? The step-down regulator power inputs are critical
discontinuous current paths that require careful
bypassing. Place the step-down regulator input
bypass capacitors as close as possible to each
switching regulator power input pair (PV_ to PG_).
? Minimize the area of the loops formed by the step-
down converters’ dynamic switching currents.
? The exposed paddle (EP) is the main path for heat
to exit the IC. Connect EP to the ground plane with
thermal vias to allow heat to dissipate from the
device.
? The MAX8671X regulator feedback nodes are sensi-
tive high-impedance nodes. Keep these nodes as
short as possible and away from the inductors.
? The thermistor node is high impedance and should
be routed with care.
? Make power ground connections to a power ground
plane. Make analog ground connections to an ana-
log ground plane. Connect the ground planes at a
single point.
TOP VIEW
8671XE
TLyww
+ aaaa
THIN QFN
5mm x 5mm x 0.8mm
Figure 15. Package Marking Example
? The REG4 LDO is a high-performance LDO with
high PSRR and low noise and care should be used
in the layout to obtain the high performance.
Generally, the REG4 LDO is powered from a step-
down regulator output, and therefore, its input
capacitor should be bypassed to the power ground
plane. However, its output capacitor should be
bypassed to the analog ground plane.
? BP is a high impedance node and leakage current
into or out of BP can affect the LDO output accuracy.
Package Marking
The top of the MAX8671X package is laser etched as
shown in Figure 15:
? “8671XETL” is the product identification code. The
full part number is MAX8671XETL; however, in this
case, the “MAX ” prefix is omitted due to space
limitations.
? “yww” is a date code. “y” is the last number in the
Gregorian calendar year. “ww” is the week number
in the Gregorian calendar. For example:
“801 ” is the first week of 2008; the week of
January 1st, 2008
“052 ” is the fifty-second week of 2010; the
week of December 27th, 2010.
“aaaa” is an assembly code and lot code.
“+ ” denotes lead-free packaging and marks
the pin 1 location.
Chip Information
PROCESS: BiCMOS
______________________________________________________________________________________
41
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相关代理商/技术参数 |
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|---|---|
| MAX8672ETD+T | 功能描述:电池管理 Backup Management IC for NiMH Batteries 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 |
| MAX8672EVKIT+ | 制造商:Maxim Integrated Products 功能描述:MAX8672 EVAL KIT - Rail/Tube |
| MAX8674EVKIT+ | 制造商:Maxim Integrated Products 功能描述:STANDARD PRODUCTS - Boxed Product (Development Kits) |
| MAX8676ELB+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX8676EWJ+T | 制造商:Maxim from Components Direct 功能描述:THE MAXIM MAX8676EWJ+T IS A USB HOT SWAP CONTROLLER. - Tape and Reel 制造商:Maxim 功能描述:The Maxim MAX8676EWJ+T is a USB Hot Swap Controller. |
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