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參數(shù)資料
| 型號(hào)： | MAX1810 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Network Interface Card Smart Regulator |
| 中文描述： | 網(wǎng)絡(luò)接口卡智能穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 263K |
| 代理商： | MAX1810 |
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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1810ESA | 功能描述:線(xiàn)性穩(wěn)壓器 - 標(biāo)準(zhǔn) RoHS:否 制造商:STMicroelectronics 輸出類(lèi)型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線(xiàn)路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
| MAX1810ESA+ | 功能描述:線(xiàn)性穩(wěn)壓器 - 標(biāo)準(zhǔn) Network Interface Card Smart Reg RoHS:否 制造商:STMicroelectronics 輸出類(lèi)型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線(xiàn)路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
| MAX1810ESA+T | 功能描述:線(xiàn)性穩(wěn)壓器 - 標(biāo)準(zhǔn) Network Interface Card Smart Reg RoHS:否 制造商:STMicroelectronics 輸出類(lèi)型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線(xiàn)路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
| MAX1810ESA-T | 功能描述:其他電源管理 RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
| MAX1811ESA | 功能描述:電池管理 USB-Powered Li+ Charger RoHS:否 制造商:Texas Instruments 電池類(lèi)型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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