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| 型号： | MAX17085GTL+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 29/38页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER/CTLR/LDO REG 40-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 功能： | 充电管理 |
| 电池化学： | 多化学 |
| 电源电压： | 4.5 V ~ 24 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： | 托盘 |
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Integrated Charger, Dual Main Step-Down
Controllers, and Dual LDO Regulators
Table 5. Main SMPS Fault Protection and Shutdown Operation
MODE
Shutdown (ON_ = High
to Low)
Output UVP (Latched
with 4 Autorestarts)
Output OVP (Latched
with 4 Autorestarts)
Thermal Fault (Latched
with 4 Autorestarts)
V CC UVLO Falling
Edge
V CC UVLO Rising
Edge
V CC POR
CONTROLLER STATE
Internal error amplifier target immediately resets to GND.
Internal error amplifier target immediately resets to GND.
After ~ 7ms timeout, the controller restarts if ON_ is still high.
Controller shuts down and the internal error amplifier target
resets to GND.
After ~ 7ms timeout, the controller restarts if ON_ is still high.
SMPS controller disabled (assuming ON_ pulled high). Internal
error amplifier target immediately resets to GND.
After the die temperature falls by ~ 50 N C, the controller restarts
if ON_ is still high.
SMPS controller disabled (assuming ON_ pulled high), internal
error amplifier target immediately resets to GND.
SMPS controller enabled (assuming ON_ pulled high),
controller ramps up the output to the preset voltage.
SMPS inactive.
DRIVER STATE
DL and DH immediately pulled low;
20 I output discharge active.
DL and DH immediately pulled low;
20 I output discharge active.
DL immediately driven high;
DH pulled low;
20 I output discharge active.
DL and DH pulled low;
20 I output discharge active.
DL and DH pulled low;
20 I output discharge active.
DL and DH held low and 20 I output
discharge active until V CC passes
the UVLO threshold.
DL and DH pulled low;
20 I output discharge active.
kV ADP 2
L CHG =
? IL CHG
= I CHG +
kV ADP 2
? IL CHG =
Charger Design Procedure
Inductor Selection
The selection criteria for the inductor trades off efficien-
cy, transient response, size, and cost. The MAX17085B's
charger combines all the inductor trade-offs in an opti-
mum way using the high-frequency current-mode archi-
tecture. High-frequency operation permits the use of a
smaller and cheaper inductor, and consequently results
in smaller output ripple and better transient response.
The charge current, ripple, and operating frequency
(off-time) determine the inductor characteristics. For
optimum efficiency, choose the inductance according to
the following equation:
4 × LIR MAX × I CHG
where k = 35ns/V.
For optimum size and inductor current ripple, choose
LIR MAX = 0.4, which sets the ripple current to 40% of the
charge current and results in a good balance between
inductor size and efficiency. Higher inductor values
decrease the ripple current. Smaller inductor values
save cost but require higher saturation current capabili-
ties and degrade efficiency.
Inductor L CHG must have a saturation current rating of at
least the maximum charge current plus 1/2 of the ripple
current ( D IL):
2
The ripple current is determined by:
4 ? L CHG
Output Capacitor Selection
The output capacitor absorbs the inductor ripple cur-
rent and must tolerate the surge current delivered from
the battery when it is initially plugged into the charger.
As such, both capacitance and ESR are important
parameters in specifying the output capacitor as a filter.
Beyond the stability requirements, it is often sufficient
to make sure that the output capacitor’s ESR is much
lower than the battery’s ESR. Either tantalum or ceramic
capacitors can be used on the output. Ceramic devices
are preferable because of their good voltage ratings and
resilience to surge currents. Choose the output capacitor
based on:
______________________________________________________________________________________
29
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17085GTL+ | 功能描述:电池管理 Dual Main Step-Down Controller 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 |
| MAX17086GTL+ | 功能描述:电池管理 Dual Main Step-Down Controller 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 |
| MAX17088ETX+ | 功能描述:显示驱动器和控制器 Boost & Level Shift for Notebook RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX17088ETX+T | 功能描述:显示驱动器和控制器 Boost & Level Shift for Notebook RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX17088EVKIT+ | 功能描述:电源管理IC开发工具 MAX17088 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 |
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