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| 型号： | MAX1864TEEE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/25页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPPLY CONTROLLER 16QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 应用： | 电源控制器 |
| 输入电压： | 4.5 V ~ 28 V |
| 电流 - 电源： | 1mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 管件 |
xDSL/Cable Modem Triple/Quintuple Output
Power Supplies
INPUT
D1
MAX1864
4.5V TO 28V
C IN
C1
IN
MAX1865
BST
DH
N H
VL
LX
C BST
L
OUTPUT
1.25V TO 5V*
C2
C OUT
ILIM
DL
N L
R POK
OUT
R COMP
POK
GND
R1
C COMP
COMP
FB
R2
* FOR OUTPUT VOLTAGES > 5V, SEE "OUTPUT VOLTAGE SELECTION."
Figure 4. Adjustable Output Voltage
where f SW is 200kHz for MAX186_T and 100kHz for
MAX186_U. The exact inductor value is not critical and
can be adjusted to make trade-offs among size, cost,
valley of the inductor current occurs at I LOAD(MAX)
minus half of the ripple current:
> I LOAD ( MAX ) - ?
? LIR ?
? 2 ? LOAD ( MAX )
and efficiency. Lower inductor values minimize size
and cost, but they also increase the output ripple and
reduce the efficiency due to higher peak currents. On
V VALLEY ( LOW )
R DS ( ON )
? I
I PEAK LOAD ( MAX ) + ?
= I
? I
the other hand, higher inductor values increase effi-
ciency, but at some point resistive losses due to extra
turns of wire will exceed the benefit gained from lower
AC current levels.
Find a low-loss inductor having the lowest possible DC
resistance that fits in the allotted dimensions. Ferrite
cores are often the best choice, though powdered iron
is inexpensive and can work well at 200kHz. The cho-
sen inductor’s saturation rating must exceed the peak
inductor current:
? LIR ?
? 2 ? LOAD ( MAX )
Setting the Current Limit
The minimum current-limit threshold must be high
enough to support the maximum load current at the
minimum tolerance level of the current-limit circuit. The
where R DS(ON) is the on-resistance of the low-side
MOSFET (N L ). For the MAX1864/MAX1865, the mini-
mum current-limit threshold is 190mV (for the typical
250mV default setting). Use the worst-case maximum
value for R DS(ON ) from the MOSFET N L data sheet, and
add some margin for the rise in R DS(ON) over tempera-
ture. A good general rule is to allow 0.5% additional
resistance for each °C of the MOSFET junction temper-
ature rise.
Connect ILIM to VL for the default 250mV (typ) current-
limit threshold. For an adjustable threshold, connect a
resistive-divider from VL to ILIM to GND. The 500mV to
2.5V external adjustment range corresponds to a
106mV to 530mV current-limit threshold. When adjust-
ing the current limit, use 1% tolerance resistors and a
10μA divider current to prevent a significant increase in
the current-limit tolerance.
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1864TEEE+ | 功能描述:DC/DC 开关控制器 xDSL/Cable Modem Triple/Quint Output RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1864TEEE+T | 功能描述:电流和电力监控器、调节器 xDSL/Cable Modem Triple/Quint Output RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX1864TEEE-T | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX1864UEEE | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX1864UEEE-T | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
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