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参数资料
| 型号： | MAX1804EUB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/11页 |
| 文件大小： | 0K |
| 描述： | IC FEEDBACK INTERGRATOR 10UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 反馈发生器 |
| 电流 - 电源： | 25µA |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-µMAX |
| 包装： | 带卷 (TR) |
External Four-Input Feedback Integrator for
Power Supplies
Pin Description
NAME
IN1
IN2
IN3
IN4
ADJ
GND
COMP
OUT
SHDN
V+
PIN
1
2
3
4
5
6
7
8
9
10
FUNCTION
Sense Input 1. Connect to one of up to four inputs to be monitored. If IN_ is the lowest active input,
IN_ will be regulated at 4 x V ADJ . If IN_ is less than 90% of the regulation set point (4 x VADJ), it is
automatically disabled.
Sense Input 2
Sense Input 3
Sense Input 4
Regulation Adjustment Input. The voltage at this input adjusts the regulation set point of
IN1 – IN4.There is a 4x scale factor between V ADJ and the regulation set point.
Ground
Integrator Capacitor Connection. Connect a capacitor (>100pF) to GND to set the integrator time
constant. See Integrator Gain-Bandwidth Product and Regulator Stability section.
Open-Drain Output. Can sink at least 10 μ A if any of the inputs remain below the regulation set point.
Connect OUT to the feedback point of the regulator-divider resistors. If OUT is connected through a
resistor, its value relative to the regulator ’ s feedback-divider values sets the maximum positive
adjustment range. See Setting the Maximum Regulator Output Adjustment Increase section.
Shutdown Control Input. When SHDN is low, the device is off and the supply current is reduced to
about 10nA. All inputs are in high-impedance state. When SHDN is high, the device is on.
Power-Supply Input. Bypass with 0.1 μ F capacitor to GND.
Detailed Description
The MAX1804 is a precision external feedback integra-
tor used for tight point-of-load regulation in power-man-
agement systems. The dynamic regulation of the output
is still controlled by the power-supply regulator. The
MAX1804 is used only to fine tune the output voltage,
removing load- and line-regulation errors and voltage
1k
1%
1k
1%
+10V
MAX400
-10V
drops across switches and connectors that occur in the
power-supply distribution line.
The MAX1804 includes four remote-sense inputs and
an output that connects to a voltage regulator ’ s feed-
3.3V
1M
1%
75k
1%
25k
1%
back divider. It can be used with any regulator or con-
troller with a high-impedance feedback input. Its OUT
pin sinks current to increase the regulator ’ s set point so
that the four IN_ inputs are at or above MAX1804 ’ s reg-
ulation set point, which is four times the voltage applied
to the ADJ pin. The MAX1804 monitors the input signals
3.3V
SHDN
OUT
ADJ
V+
MAX1804
IN1
IN2
IN3
IN4
and compares the lowest to the voltage set point. The
COMP
error between the input signal and the set point is inte-
grated. The MAX1804 output stage generates a current
EXTERNAL
REF
0.1 μ F
470pF
based on the integrator output to adjust the regulator ’ s
output voltage to meet the set point.
Figure 1. Test Circuit for MAX1804 IN_ Regulation Set Point
6
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