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参数资料
| 型号： | MAX17535ETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 26/28页 |
| 文件大小： | 0K |
| 描述： | IC SMBUS BATT CHARGER 24TQFN |
| 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（锂离子），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： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
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High-Frequency,
Low-Cost SMBus Chargers
BATT ( V DCIN - V BATT ) ?
I RMS = I CHG ?
?
?
Inductor L1 must have a saturation current rating of at
least the maximum charge current plus 1/2 the ripple
current ( D I L ):
I SAT = I CHG + (1/2) D I L
The ripple current is determined by:
D I L = V BATT O t OFF /L
where:
t OFF = 2.5 F s (V DCIN - V BATT )/
V DCIN for V BATT < 0.88 V DCIN
or:
t OFF = 0.3 F s for V BATT > 0.88 V DCIN
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 surge currents:
? V ?
? V DCIN ?
The input capacitors should be sized so that the
temperature rise due to ripple current in continuous
conduction does not exceed approximately 10 N 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 current
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 the ensure stability of the DC-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. For most
applications the output capacitance can be as low as
4.7 F F. If the output voltage is low and the input voltage is
high, the output capacitance may need to be increased.
Applications Information
Layout and Bypassing
Bypass DCIN with a 0.1 F F ceramic to ground (Figure 1).
N3 and Q1A protect the MAX17435/MAX17535 when the
DC power source input is reversed. Bypass V CC , DCIN,
LDO, and V AA , as shown in Figure 1.
Good PCB layout is required to achieve specified noise
immunity, efficiency, and stable performance. The
PCB layout artist 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 MAX17435 and MAX17535
Evaluation Kits 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 connections, 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:
U Minimize the current-sense resistor trace lengths,
and ensure accurate current sensing with Kelvin
connections.
U Minimize ground trace lengths in the high-current
paths.
U Minimize other trace lengths in the high-current
paths.
U Use > 5mm wide traces in the high-current paths.
U Connect C1 and C2 to high-side MOSFET (10mm
max length).
U Minimize the LX node (MOSFETs, rectifier cathode,
inductor (15mm max length). Keep LX on one side
of the PCB to reduce EMI radiation.
26
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相关代理商/技术参数 |
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|---|---|
| MAX17535EVKIT+ | 功能描述:电池管理 EVKIT 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 |
| MAX17552ATB+T | 制造商:Maxim Integrated Products 功能描述: |
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