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MAX8556_09

更新时间： 2024-10-01 12:19:47
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美信 - MAXIM 稳压器
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10页 222K
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4A Ultra-Low-Input-Voltage LDO Regulators

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MAX8556_09 数据手册

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19-3257; Rev 2; 8/09  
4A Ultra-Low-Input-Voltage  
LDO Regulators  
6/MAX857  
General Description  
Features  
The MAX8556/MAX8557 low-dropout linear regulators  
operate from input voltages as low as 1.425V and are  
able to deliver up to 4A of continuous output current  
with a typical dropout voltage of only 100mV. The out-  
o 1.425V to 3.6V Input Voltage Range  
o Guaranteed 4A Output Current  
o
1% Output Accuracy Over Load/Line/  
Temperature  
o 100mV Dropout at 4A Load (typ)  
o Built-In Soft-Start  
put voltage is adjustable from 0.5V to V - 0.2V.  
IN  
Designed with an internal p-channel MOSFET pass tran-  
sistor, the MAX8556/MAX8557 maintain a low 800µA typi-  
cal supply current, independent of the load current and  
dropout voltage. Using a p-channel MOSFET eliminates  
the need for an additional external supply or a noisy inter-  
nal charge pump. Other features include a logic-con-  
trolled shutdown mode, built-in soft-start, short-circuit  
protection with foldback current limit, and thermal-over-  
load protection. The MAX8556 features a POK output that  
transitions high when the regulator output is within 10ꢀ  
of its nominal output voltage. The MAX8557 offers a  
power-on reset output that transitions high 140ms after the  
output has achieved 90ꢀ of its nominal output voltage.  
o 800µA (typ) Operating Supply Current  
o 150µA (max) Shutdown Supply Current  
o Short-Circuit Current Foldback Protection  
o Thermal-Overload Protection  
o
10% Power-OK (MAX8556)  
o 140ms Power-On Reset Output (MAX8557)  
o Fast Transient Response  
o 16-Pin Thin QFN (5mm x 5mm) Package  
The MAX8556/MAX8557 are available in a 16-pin thin  
QFN 5mm x 5mm package with exposed paddle.  
Ordering Information  
TEMP  
RANGE  
PIN-  
PACKAGE  
Applications  
PART  
FEATURE  
Servers and Storage Devices  
MAX8556ETE+  
-40°C to +85°C 16 Thin QFN-EP*  
POK  
POK  
POR  
Networking  
MAX8556ETE/V+ -40°C to +85°C 16 Thin QFN-EP*  
MAX8557ETE+ -40°C to +85°C 16 Thin QFN-EP*  
Base Stations  
Optical Modules  
Point-of-Load Supplies  
ATE  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
/V Denotes an automotive qualified part.  
*EP = Exposed pad.  
Typical Operating Circuit  
Pin Configuration  
TOP VIEW  
V
V
IN  
OUT  
0.5V TO V - 0.2V  
1.425V TO 3.6V  
IN  
12 11 10  
9
IN  
OUT  
FB 13  
8
7
6
OUT  
OUT  
IN  
MAX8556  
GND 14  
N.C. 15  
EN 16  
(MAX8557)  
MAX8556  
(MAX8557)  
EN  
FB  
5
IN  
EP  
4
+
POK  
(POR)  
1
2
3
GND  
N.C.  
THIN QFN  
5mm x 5mm  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
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