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| 型号： | MAX17085GTL+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 32/38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
Common Design Procedure
100
600kHz
800kHz
400kHz
200kHz
The input capacitor and MOSFET selection criteria share
common considerations for the charger and the main
SMPS. For the following sections, V IN is V DCIN for the
charger and V SYS for the main SMPS, V OUT is V BATT for
the charger and V OUT5 or V OUT3 for the main SMPS, and
I OUT is I CHG for the charger and I LOAD for the main SMPS.
( D I LOAD(MAX) )
L
? V OUT ( V IN -V OUT )
I RMS = I LOAD ? ?
? ?
? I LOAD(MAX) LIR ?
I LIM(VAL) LOAD(MAX) - ? ?
? ?
? ?
PD COND (HS) = × I OUT 2 × R DS(ON)
10
1
0.5 0.6 0.7 0.8 0.9 1.0
DUTY CYCLE
Figure 6. Scale Factor vs. Duty Cycle
where K is a function of maximum duty cycle (lowest
input voltage) and switching frequency as shown in
Figure 6.
The amount of overshoot during a full-load to no-load tran-
sient due to stored inductor energy can be calculated as:
2
V SOAR ≈
2C OUT V OUT
Setting the Current Limit
The minimum current-limit threshold must be great
enough to support the maximum load current when the
current limit is at the minimum tolerance value. The valley
of the inductor current occurs at I LOAD(MAX) minus half
the ripple current; therefore:
> I
2
where I LIM(VAL) equals the minimum valley current-limit
threshold voltage divided by the current-sense element
Input Capacitor Selection
The input capacitor must meet the ripple-current require-
ment (I RMS ) imposed by the switching currents:
?
? V IN ?
For most applications, nontantalum chemistries (ceramic,
aluminum, or OS-CON) are preferred due to their resis-
tance to power-up surge currents typical of systems with
a mechanical switch or connector in series with the input.
In either configuration, choose a capacitor that has less
than 10 N C temperature rise at the RMS input current for
optimal reliability and lifetime.
Power-MOSFET Selection
High-Side MOSFET Power Dissipation
The conduction loss in the high-side MOSFET (N H ) is
a function of the duty factor, with the worst-case power
dissipation occurring at the minimum input voltage, and
maximum output voltage in the case of the charger:
V OUT
V IN
Calculating the switching losses in high-side MOSFET
(N H ) is difficult since it must allow for difficult quantify-
ing factors that influence the turn-on and turn-off times.
These factors include the internal gate resistance, gate
charge, threshold voltage, source inductance, and PCB
layout characteristics. The following switching-loss cal-
culation provides only a very rough estimate and is no
substitute for breadboard evaluation, preferably includ-
ing verification using a thermocouple mounted on N H :
C OSS V IN 2 f SW
? Q G(SW) ?
Connect a resistor-divider from REF to ILIM to analog = V IN I OUT f SW ? ? +
? I GATE ?
ground (AGND) to set the adjustable current-limit thresh-
(low-side R DSON ).
2
old. The valley current-limit threshold is approximately
1/10 the ILIM voltage over a 0.2V to 2.1V range. The where C OSS is the N H MOSFET’s output capacitance,
adjustment range corresponds to a 20mV to 210mV val- Q G(SW) is the charge needed to turn on the N H MOSFET,
ley current-limit threshold. When adjusting the current and I GATE is the peak gate-drive source/sink current (2A typ).
limit, use 1% tolerance resistors to prevent significant The following high-side MOSFET’s loss is due to the reverse-
inaccuracy in the valley current-limit tolerance. recovery charge of the low-side MOSFET’s body diode:
32
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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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