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参数资料
| 型号： | MAX1845EEI |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | Dual, High-Efficiency, Step-Down Controller with Accurate Current Limit |
| 中文描述： | DUAL SWITCHING CONTROLLER, 620 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | 0.150 INCH, 0.025 INCH PITCH, MO-137AD, QSOP-28 |
| 文件页数： | 13/27页 |
| 文件大小： | 543K |
| 代理商： | MAX1845EEI |
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M
Dual, High-Efficiency, Step-Down
Controller with Accurate Current Limit
______________________________________________________________________________________
13
where K is the on-time scale factor (Table 4). The load-
current level at which PFM/PWM crossover occurs,
I
LOAD(SKIP)
, is equal to 1/2 the peak-to-peak ripple cur-
rent, which is a function of the inductor value (Figure
4). For example, in the standard application circuit with
V
OUT1
= 2.5V, V
IN
= 15V, and K = 2.96μs (Table 4),
switchover to pulse-skipping operation occurs at I
LOAD
= 0.7A or about 1/6 full load. The crossover point
occurs at an even lower value if a swinging (soft-satu-
ration) inductor is used.
The switching waveforms may appear noisy and asyn-
chronous when light loading causes pulse-skipping
operation, but this is a normal operating condition that
results in high light-load efficiency. Trade-offs in PFM
noise vs. light-load efficiency are made by varying the
inductor value. Generally, low inductor values produce
a broader efficiency vs. load curve, while higher values
result in higher full-load efficiency (assuming that the
coil resistance remains fixed) and less output voltage
ripple. Penalties for using higher inductor values
FB2
V
CC
OUT 2
PWM
CONTROLLER
(FIGURE 3)
V+
V+
2V
REF
AGND*
* IN THE MAX1845EEI, AGND AND PGND ARE INTERNALLY CONNECTED AND CALLED GND.
FAULT1
FAULT2
REF
20
V
DD
OUT1
UVP
OVP
TON
FB1
SKIP
PGOOD
ON1
ON2
5V INPUT
DL1
V
DD
LX1
CS1
DH1
BST1
V
DD
V
DD
V
DD
V+
PWM
CONTROLLER
(FIGURE 3)
PGND*
MAX1845
V
CC
- 1V
0.5V
I
LIM1
I
LIM2
DL2
V
DD
LX2
CS2
DH2
BST2
V
DD
V+
V
CC
- 1V
0.5V
2V TO 28V
Figure 2. Functional Diagram
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1845EEI+ | 功能描述:电流型 PWM 控制器 Step-Down Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1845EEI+T | 功能描述:电流型 PWM 控制器 Step-Down Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1845EEI-T | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1845EEI-TG05 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1845EEI-TG068 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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