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参数资料
| 型号： | MAX181CMJL |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | ADC |
| 英文描述： | INDUCTOR 3.9NH +-.2NH 0402 SMD |
| 中文描述： | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, CDIP40 |
| 封装： | CERDIP-40 |
| 文件页数： | 6/8页 |
| 文件大小： | 263K |
| 代理商： | MAX181CMJL |
M
Network Interface Card Smart Regulator
6
_______________________________________________________________________________________
Detailed Description
The MAX1810 powers NICs, modem cards, or other
devices that utilize both the main and auxiliary power
supplies in a PCI-compliant system, or other systems
that utilize a standby or sleep-mode power bus. The
MAX1810 supplies a 3.3V, 500mA output from one of
three inputs: a +5V main, a +5V standby, and a +3.3V
auxiliary voltage.
Each input is separately monitored (Figure 1). During
normal operation, the MAIN input powers the fixed
+3.3V output (OUT) through an internal linear regulator.
When MAIN falls below +4.1V or is disconnected, STBY
input powers the output through an internal linear regu-
lator. When the STBY voltage is below +4.1V, an inter-
nal switch connects the +3.3V AUX input to OUT. The
AUX input maintains the output until AUX falls below
+2.5V. Figure 2 shows MAX1810 input transition thresh-
olds. Switchover from one input to another is fast
enough to prevent OUT from falling below +3V under
all cases unless all inputs are below their required volt-
ages. If both MAIN and STBY are above +4.475V, the
MAIN input supplies the output.
The MAX1810 prevents reverse current from flowing
from the output to any unbiased or low-voltage input.
Linear Regulators
The MAIN or STBY inputs generate the +3.3V output
through linear regulators. Each regulator uses an inter-
nal P-channel MOSFET pass transistor. The MAIN or
STBY linear regulator will operate until its input falls
below +4.1V, when it shuts off. Either remaining regula-
tor or AUX input then powers the output. MAIN takes
precedence when both MAIN and STBY are valid.
+3.3V AUX Switch
A 0.18
internal switch connects the AUX input to the
output when both MAIN and STBY are below 4.1V and
AUX is greater than 2.5V. When both MAIN and STBY
are below 4.1V or unconnected, and AUX is below 2.5V,
the internal switch does not activate and OUT follows
AUX less one diode drop.
Thermal and Overcurrent Protection
Thermal overload protection limits total power dissipa-
tion in the MAX1810. When the junction temperature
exceeds T
J
= +170
°
C, the MAX1810 turns off. The
device turns back on once its junction temperature
drops by approximately +20
°
C. A continuous short at
OUT will result in a pulsed output as the thermal over-
load circuitry cycles the device on and off.
3.3V
OUT
MAIN
5V
DET
5V
DET
MAIN
REG
STBY
REG
CONTROL
LOGIC
STBY
AUX
GND
3.3V
DET
Figure 1. Functional Diagram
MAIN OR STBY
LDO
GUARANTEED
ON
AUX SWITCH
GUARANTEED
ON
(IF AUX > 2.5V)
MAIN OR STBY
INPUT VOLTAGE
5.5V
4.475V
3.925V
0
DETECTION
THRESHOLD
RANGE
4.1V(TYP)
Figure 2. MAIN, STBY, and AUX Transition Voltages
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| MAX1820EUB-T | 功能描述:直流/直流开关调节器 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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