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参数资料
| 型号： | MAX1641EEE |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | Adjustable-Output, Switch-Mode Current Sources with Synchronous Rectifier |
| 中文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 0.150 INCH, 0.025 INCH PITCH, QSOP-16 |
| 文件页数： | 8/11页 |
| 文件大小： | 116K |
| 代理商： | MAX1641EEE |
M
The voltage at SET is given by:
R1 = R2 (V
REF
/ V
SET
-1 ); 10k
< R2 < 300k
where V
REF
= 2V and V
SET
is proportional to the
desired output current level.
The MAX1640/MAX1641 are specified for V
SET
between 0V and V
REF
. For V
SET
> V
REF
, output current
increases linearly (with reduced accuracy) until it
clamps at V
SET
≈
4V.
Pulse-T ric kle Mode: S elec ting the
Pulse-T ric kle Current
Pulling D0 low and D1 high selects pulse-trickle mode.
This current equals V
SET
/ (13.3R
SENSE
) and remains
on for 12.5% of the period set by R
TOFF
. Pulse-trickle
current maintains full charge across the battery and
can slowly charge a cold battery before fast charging
commences.
Off Mode: T urning Off the Output Current
Pulling D0 and D1 low turns off the P-channel FET and
hence the output current flow. This mode also controls
end of charge and protects the battery against exces-
sive temperatures.
S etting the Maximum Output
V oltage Level
The maximum output voltage should be programmed to
a level higher than the output/battery voltage (I
LOAD
x
R
LOAD
). An external resistor-divider between the output
and ground (Figure 4) sets the voltage at TERM. Once
the voltage at TERM exceeds the reference, the internal
comparator turns off the P-channel FET, terminating
current flow. Select R4 in the 10k
to 500k
range.
R3 is given by:
R3 = R4 (V
OUT
/ V
TERM
) -1
PERIOD = 3.2 x 10 x R
(sec)
TOFF
Adjustable-Output, S witc h-Mode
Current S ourc e with S ync hronous Rec tifier
8
_______________________________________________________________________________________
D1
0
0
DO
0
1
MODE
OFF
Top-Off
OUTPUT CURRENT (A)
0
V
SET
/ (13.3R
SENSE
)
V
SET
/ (13.3R
SENSE
)
12.5% duty cycle
1
0
Pulse-Trickle
1
1
Fast Charge
V
SET
/ (13.3R
SENSE
)
Table 1. Selecting Output Current Levels
MAX1640
MAX1641
REF
SET
R1
R2
Figure 3. Adjusting the Output Current Level
MAX1640
CS+
TERM
CS-
R3
R
SENSE
BATT
L
R4
Figure 4a. Setting the Maximum Output Voltage Level
MAX1641
CS+
TERM
CS-
R3
BATT
R4
R
SENSE
L
Figure 4b. Setting the Maximum Output Voltage Level
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1641EEE+ | 功能描述:电流型 PWM 控制器 Adj-Out Switch Mode Current Source 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 |
| MAX1641EEE+T | 功能描述:电流型 PWM 控制器 Adj-Out Switch Mode Current Source 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 |
| MAX1641EEE-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 |
| MAX1642EUA | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1642EUA+ | 功能描述:直流/直流开关转换器 Integrated Circuits (ICs) RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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