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参数资料
| 型号： | MAX1534ETE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/16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
V OUT3
50mV/div
V OUT1
R TOP1
OUT1
PRESET
IN
V IN = +7V TO +24V
AC-COUPLED
FB1
10V
0
1A
V LX
10V/div
I LX
V OUT2
R BOT1
OUT2
MAX1534
LX
FB3
R TOP3
V OUT3
0
500mA/div
R TOP2
R BOT3
FB2
4 μ s/div
V IN = 12V, I OUT3 = 300mA
R BOT2
GND
Figure 3. Normal Buck Operation
Figure 4. Adjustable Output Voltages
voltage. For optimum performance, select an inductor
with the lowest possible DC resistance that fits in the
allotted dimensions. Some recommended component
manufacturers are listed in Table 2.
V RIPPLE ( C ) =
L × ( I PEAK ? I OUT 3 ) 2 ? V IN ?
? ?
2 C OUT 3 × V OUT 3 ? V IN ? V OUT 3 ?
Maximum Buck Output Current
The MAX1534 ’ s buck converter ’ s maximum output cur-
rent is limited by the peak inductor current. For the typi-
cal application, the maximum output current is
approximately:
I OUT3(MAX) = 1/2 I LX (PEAK)(MIN)
For low-input voltages, the maximum on-time can be
reached and the load current is limited by:
I OUT3 = 1/2 (V IN - V OUT3 ) ? 10μs / L
Note that any current provided by the linear regulators
comes from the buck regulator and subtracts from the
maximum current that the buck provides for other loads.
Buck Output Capacitor Selection
Choose the output capacitor to service the maximum
load current with acceptable voltage ripple. The output
ripple has two components: variations in the charge
stored in the output capacitor with each LX pulse, and
the voltage drop across the capacitor ’ s equivalent
series resistance (ESR) caused by the current into and
where I PEAK is the peak inductor current (see Inductor
Selection ). The worst-case ripple occurs at no load.
These equations are suitable for initial capacitor selec-
tion, but final values should be set by testing a proto-
type or evaluation circuit. As a general rule, a smaller
amount of charge delivered in each pulse results in
less output ripple. Since the amount of charge deliv-
ered in each oscillator pulse is determined by the
inductor value and input voltage, the voltage ripple
increases with larger inductance, and as the input volt-
age decreases. See Table 1 for recommended capaci-
tor values and Table 2 for recommended component
manufacturers.
Buck Input Capacitor Selection
The input filter capacitor reduces peak currents drawn
from the power source and reduces noise and voltage
ripple on the input caused by the circuit ’ s switching.
The input capacitor must meet the ripple-current
requirement (I RMS ) imposed by the switching current
defined by the following equation:
I RMS = OUT 3
? ? × ? 1
out of the capacitor:
V RIPPLE ? V RIPPLE(ESR) + V RIPPLE(C)
The output voltage ripple as a consequence of the ESR
I
× V OUT 3 ? 4 ? V IN
V IN ? 3 ? V OUT 3
and output capacitance is:
V RIPPLE(ESR) = ESR ? I PEAK
For most applications, nontantalum chemistries (ceram-
ic, aluminum, polymer, or OSCON) are preferred due to
their robustness to high inrush currents typical of sys-
tems with low-impedance battery inputs. Choose an
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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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