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参数资料
| 型号： | MAX17006BETP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/22页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHARGER 1.2MHZ 20-TQFN |
| 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： | 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
The following additional loss occurs in the low-side
The ripple current is determined by:
MOSFET due to the body diode conduction losses:
PD BDY ( LS ) = 0 . 05 × I PEAK × 0 . 4 V
? I L =
k × V IN2
4 L
The total power low-side MOSFET dissipation is:
PD TOTAL ( LS ) ≈ PD COND ( LS ) + PD BDY ( LS )
These calculations provide an estimate and are not a
substitute for breadboard evaluation, preferably including
a verification using a thermocouple mounted on the
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:
CSIN × ( V DCIN - V CSIN )
? ?
MOSFET.
Inductor Selection
The selection of the inductor has multiple trade-offs
? V
I RMS = I CHG × ?
V DCIN
?
?
? ?
between efficiency, transient response, size, and cost.
Small inductance is cheap and small, and has a better
transient response due to higher slew rate; however, the
efficiency is lower because of higher RMS current. High
inductance results in lower ripple so that the need of the
output capacitors for output-voltage ripple goes low.
The MAX17005B/MAX17006B/MAX17015B combine all
the inductor trade-offs in an optimum way by controlling
switching frequency. High-frequency operation permits
the use of a smaller and cheaper inductor, and conse-
quently results in smaller output ripple and better tran-
sient 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:
The input capacitors should be sized so that the tem-
perature rise due to ripple current in continuous conduc-
tion 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
L =
k × V IN 2
4 × I CHG × LIR MAX
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
where k = 35ns/V.
For optimum size and inductor current ripple, choose
LIR MAX = 0.4, which sets the ripple current to 40% the
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:
charge current and results in a good balance between
inductor size and efficiency. Higher inductor values
decrease the ripple current. Smaller inductor values
C OUT =
I RIPPLE
f SW × 8 × ? V CSIN
× k CAP ? BIAS
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 ( ? I L ):
I SAT = I CHG + (1/2) ? I L
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 ? 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.
18
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17006ETP+ | 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 |
| MAX17006ETP+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 |
| MAX17006EVKIT+ | 功能描述:电池管理 1.2MHz Low-Cost High-Performance Chargers 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 |
| MAX17007AGTI+ | 功能描述:电压模式 PWM 控制器 QPWM Graphics Core Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX17007AGTI+T | 功能描述:电压模式 PWM 控制器 QPWM Graphics Core Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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