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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： | 8/27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
8
_______________________________________________________________________________________
400μs/div
V
1V/div
I
2A/div
STARTUP WAVEFORM
(4A COMPONENTS, SKIP = GND, V
OUT2
= 2.5V)
100
μ
s/div
V
OUT2
1V/div
I
OUT2
5A/div
SHUTDOWN WAVEFORM
(4A COMPONENTS, SKIP = GND, V
OUT2
= 2.5V)
Typical Operating Characteristics (continued)
(Circuit of Figure 1, components from Table 1, V
IN
= 15V,
SKIP
= GND, TON = unconnected, T
A
= +25
°
C, unless otherwise noted.)
PIN
QSOP
QFN
NAME
FUNCTION
1
32
OUT1
Output Voltage Connection for the OUT1 PWM. Connect directly to the junction of the external
inductor and output filter capacitors. OUT1 senses the output voltage to determine the on-time
and also serves as the feedback input in fixed-output modes.
2
33
FB1
Feed b ack Inp ut for O U T1. C onnect to G N D for 1.8V fi xed outp ut or to V
C C
for 1.5V fi xed outp ut, or
connect to a r esi stor d vi d er netw or k fr om O U T1 for an ad ustab e outp ut b etw een 1V and 5.5V
3
34
ILIM1
Current-Limit Threshold Adjustment for OUT1. The current-limit threshold at CS1 is 0.1 times the
voltage at ILIM1. Connect a resistor-divider network from REF to set the current-limit threshold
between 25mV and 250mV (with 0.25V to 2.5V at ILIM). Connect to V
CC
to assert 50mV default
current-limit threshold.
4
35
V+
Battery Voltage-Sense Connection. Connect to input power source. V+ is only used to adjust the
DH_ on-time for pseudofixed-frequency operation.
On-Time Selection Control Input. This four-level input pin sets the DH_ on-time to determine the
operating frequency.
TON
FREQUENCY (OUT1) (kHz)
FREQUENCY (OUT2) (kHz)
AGND
620
460
REF
485
355
Open
345
255
5
1
TON
V
CC
235
170
6
2
SKIP
Pulse-Skipping Control Input. Connect to V
CC
for low-noise forced-PWM mode. Connect to AGND
to enable pulse-skipping operation.
Pin Description
I
OUT1
5A/div
20
μ
s/div
V
100mV/div
LOAD-TRANSIENT RESPONSE
(8A COMPONENTS, PWM MODE, V
OUT1
= 1.8V)
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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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