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| 型号： | MAX1534ETE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPPLY CONTROLLER 16TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 电源控制器 |
| 输入电压： | 4.5 V ~ 26 V |
| 电流 - 电源： | 15µA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
High-Efficiency, Triple-Output, Keep-Alive
Power Supply for Notebook Computers
ous operation, do not exceed the absolute maximum
junction temperature rating of T J = +150 ° C.
Operating Region and Power Dissipation
The MAX1534 ’ s maximum power dissipation depends
Table 4. PRESET Setting
PRESET MODE
IN Adjustable
OUT_ AND FB_
FB_ regulates to 1.0V
on the thermal resistance of the case and circuit board,
OUT1 = 3.3V, FB1 = GND,
the temperature difference between the die junction
and ambient air, and the rate of air flow. The power dis-
GND
Preset
OUT2 = 1.8V, FB2 = GND,
OUT3 = FB3 = 5.0V
sipated in the device is the sum of the buck MOSFET
switching and conduction losses and the linear regula-
tors ’ conduction losses. The maximum power dissipa-
±15mV, the output can be set using fixed resistors
instead of trim pots.
tion is:
P MAX = (T J - T A ) / ( θ JB + θ BA )
Design Procedure
where T J - T A is the temperature difference between the
MAX1534 die junction and the surrounding air, θ JB (or
θ JC ) is the thermal resistance of the package, and θ BA is
the thermal resistance through the printed circuit board,
copper traces, and other materials to the surrounding
air. The exposed backside pad of the MAX1534 pro-
vides a low thermal impedance to channel heat out of
the package. Connect the exposed backside pad to
ground using a large pad or ground plane.
Preset and Adjustable Output Voltages
( PRESET )
The MAX1534 features dual mode operation; it oper-
ates in either a preset voltage mode (see Table 4) or an
adjustable mode. In preset voltage mode, internal
trimmed feedback resistors set the MAX1534 outputs to
3.3V for V OUT1 , 1.8V for V OUT2 , and 5.0V for FB3 (buck
regulator). Select this mode by connecting PRESET to
ground. Connect PRESET to IN to operate the
Buck Converter
Inductor Selection
When selecting the inductor, consider these four para-
meters: inductance value, saturation rating, series
resistance, and size. The MAX1534 operates with a
wide range of inductance values. For most applica-
tions, values between 10μH and 50μH work best with
the controller ’ s high switching frequency. Larger induc-
tor values reduce the switching frequency and thereby
improve efficiency and EMI. The trade-off for improved
efficiency is a higher output ripple and slower transient
response. On the other hand, low-value inductors
respond faster to transients, improve output ripple, offer
smaller physical size, and minimize cost. If the inductor
value is too small, the peak inductor current exceeds
the current limit due to current-sense comparator prop-
agation delay, potentially exceeding the inductor ’ s cur-
rent rating. Calculate the minimum inductance value as
follows:
MAX1534 in the adjustable mode. Select an output volt-
age using two external resistors connected as a volt-
age-divider to FB_ (Figure 4). The output voltage is set
by the following equation:
L ( MIN ) =
( V IN(MAX ) - V OUT3 ) × t ON(MIN)
I LX ( PEAK )
V OUT _ = V FB _ ? 1 +
?
?
R TOP _ ?
R BOT _ ? ?
where t ON(MIN) = 0.5μs.
The inductor ’ s saturation current rating must be greater
than the peak switch current limit, plus the overshoot
where V FB_ = 1.0V, V OUT1 and V OUT2 can range from
1.0V to V LDOIN , and V OUT3 can range from 1.0V to V IN .
To simplify resistor selection:
due to the 150ns current-sense comparator propaga-
tion delay. Saturation occurs when the inductor ’ s mag-
netic flux density reaches the maximum level the core
can support and the inductance starts to fall. Choose
R TOP _ = R BOT _ ?
? 1 ?
? V OUT _
? V FB _
?
?
an inductor with a saturation rating greater than I PEAK
in the following equation:
I PEAK = I LX(PEAK) + (V IN - V OUT3 ) ? 150ns / L
Choose R BOT_ = 100k ? to optimize power consump-
tion, accuracy, and high-frequency power-supply rejec-
tion. The total current through the external resistive
feedback and load resistors should not be less than
10μA. Since the V FB_ tolerance is typically less than
Inductor series resistance affects both efficiency and
dropout voltage (see the Buck Dropout Performance
section).
High series resistance limits the maximum current avail-
able at lower input voltages, and increases the dropout
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1535AETJ | 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 |
| MAX1535AETJ+T | 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 |
| MAX1535AETJT | 制造商:MAXIM 功能描述:New |
| MAX1535AETJ-T | 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 |
| MAX1535BETJ | 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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