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参数资料
| 型号： | MAX17015AETP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/23页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHARGER 1.2MHZ 20TQFN |
| 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： | 20-WFQFN 裸露焊盘 |
| 供应商设备封装： | 20-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
1.2MHz, Low-Cost,
High-Performance Chargers
k × V IN2
Δ I L =
For optimum size and inductor current ripple, choose
LIR MAX = 0.4, which sets the ripple current to 40% 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 L1 must have a saturation current rating of at
least the maximum charge current plus 1/2 the ripple
current ( Δ I L ):
I SAT = I CHG + (1/2) Δ I L
The ripple current is determined by:
4 L
Input Capacitor Selection
The input capacitor must meet the ripple current
requirement (I RMS ) imposed by the switching currents.
Nontantalum chemistries (ceramic, aluminum, or
OS-CON) are preferred due to their resilience to power-
up and surge currents:
Choose k CAP-BIAS is a derating factor of 2 for typical 25V-
rated ceramic capacitors.
For f SW = 800kHz, I RIPPLE = 1A, and to get Δ V BATT =
70mV, choose C OUT as 4.7μF.
If the internal resistance of battery is close to the ESR of
the output capacitor, the voltage ripple is shared with
the battery and is less than calculated.
Applications Information
Setting Input Current Limit
The input current limit should be set based on the cur-
rent capability of the AC adapter and the tolerance of
the input current limit. The upper limit of the input cur-
rent threshold should never exceed the adapter’s mini-
mum available output current. For example, if the
adapter’s output current rating is 5A ± 10%, the input
current limit should be selected so that its upper limit is
less than 5A × 0.9 = 4.5A. Since the input current-limit
accuracy of the MAX17005A/MAX17006A/MAX17015A
is ± 3%, the typical value of the input current limit should
be set at 4.5A/1.03 ≈ 4.36A. The lower limit for input cur-
rent must also be considered. For chargers at the low
BATT × ( V DCIN BATT )
? ?
? V - V
I RMS = I CHG × ?
V DCIN
?
?
? ?
end of the specification, the input current limit for this
example could be 4.36A × 0.95 or approximately 4.14A.
Layout and Bypassing
The input capacitors should be sized so that the tem-
perature rise due to ripple current in continuous con-
duction does not exceed approximately 10 ° C. The
maximum ripple current occurs at 50% duty factor or
V DCIN = 2 x V BATT , which equates to 0.5 x I CHG . If the
application of interest does not achieve the maximum
value, size the input capacitors according to the worst-
case conditions.
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
and to ensure the stability of the DC-to-DC converter
(see the Compensation section.) 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:
Bypass DCIN with a 0.1μF ceramic capacitor to ground
(Figure 1). N1 and N2 protect the MAX17005A/
MAX17006A/MAX17015A when the DC power source
input is reversed. Bypass V AA , CSSP, and LDO as shown
in Figure 1.
Good PCB layout is required to achieve specified noise
immunity, efficiency, and stable performance. The PCB
layout designer must be given explicit instructions—
preferably, a sketch showing the placement of the
power switching components and high current routing.
Refer to the PCB layout in the MAX17005A/MAX17006A/
MAX17015A evaluation kit for examples. A ground
plane is essential for optimum performance. In most
applications, the circuit is located on a multilayer
board, and full use of the four or more copper layers is
recommended. Use the top layer for high-current con-
nections, the bottom layer for quiet connections, and
the inner layers for an uninterrupted ground plane.
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,
C OUT =
I RIPPLE
f SW × 8 × Δ V BATT
× k CAP ? BIAS
and ensure accurate current sensing with Kelvin
connections.
20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17015BETP+ | 功能描述:电池管理 1.2MHz High-Perf 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 |
| MAX17015BETP+T | 功能描述:电池管理 1.2MHz High-Perf 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 |
| MAX17015ETP+ | 功能描述:电池管理 1.2MHz High-Perf 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 |
| MAX17015ETP+T | 功能描述:电池管理 1.2MHz High-Perf 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 |
| MAX17015ETP+TG51 | 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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