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MAX8560|MAX8561|MAX8562 PDF预览

MAX8560|MAX8561|MAX8562

更新时间： 2024-11-25 23:51:59
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美信 - MAXIM 转换器
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12页 514K
描述
4MHz. 500mA Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN

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19-2954; Rev 1; 1/04  
4MHz, 500mA Synchronous Step-Down  
DC-DC Converters in Thin SOT and TDFN  
General Description  
Features  
The MAX8560/MAX8561/MAX8562 step-down DC-DC  
converters are optimized for applications that prioritize  
small size and high efficiency. They utilize a proprietary  
hysteretic-PWM control scheme that switches with fixed  
frequency and is adjustable up to 4MHz, allowing cus-  
tomers to trade efficiency for smaller external compo-  
nents. Output current is guaranteed up to 500mA, while  
quiescent current is only 40µA (typ).  
♦ Up to 4MHz PWM Switching Frequency  
♦ 500mA Guaranteed Output Current  
♦ 40µA (typ) Quiescent Current  
♦ Adjustable Output Voltage from 0.6V to 2.5V  
♦ Logic-Controlled Output Voltage (MAX8561)  
♦ Drives External Bypass FET (MAX8562)  
Internal synchronous rectification greatly improves effi-  
ciency and eliminates the external Schottky diode  
required in conventional step-down converters. Built-in  
soft-start eliminates inrush current to reduce input  
capacitor requirements. The MAX8561 features logic-  
controlled output voltage, while the MAX8562 drives an  
external bypass FET.  
♦
1.5ꢀ ꢁnitial Accuracy  
♦ Soft-Start Eliminates ꢁnrush Current  
♦ Fast Voltage-Positioning Transient Response  
♦ ꢁnternal Synchronous Rectifier  
♦ 2.7V to 5.5V ꢁnput  
The MAX8560 is available in a 5-pin Thin SOT23 pack-  
age. The MAX8561/MAX8562 are available in space-  
saving 8-pin 3mm x 3mm Thin DFN packages.  
♦ 0.1µA Logic-Controlled Shutdown  
♦ Thermal Shutdown  
♦ Thin SOT23 or Space-Saving 3mm x 3mm x  
0.8mm TDFN Packages  
Applications  
Ordering Information  
Microprocessor/DSP Core Supplies  
TOP  
PART  
TEMP RANGE  
PꢁN-PACKAGE  
MARK  
ADRX  
AHD  
Cellular and Smart Phones  
MAX8560EZK-T -40°C to +85°C 5 Thin SOT23-5  
CDMA/RF Power-Amplifier Supplies  
PDAs, DSC, and MP3 Players  
MAX8561ETA  
MAX8562ETA  
-40°C to +85°C 8 TDFN  
-40°C to +85°C 8 TDFN  
AHE  
Typical Operating Circuit  
Pin Configurations  
TOP VIEW  
OUTPUT  
L
1µH  
8
7
6
5
INPUT  
0.6V TO 2.5V  
UP TO 500mA  
2.7V TO 5.5V  
IN  
GND  
1
2
3
5
4
LX  
LX  
FB  
IN  
C
C
OUT  
2.2µF  
IN  
2.2µF  
MAX8560  
MAX8560  
R1  
R2  
GND  
MAX8561/  
MAX8562  
C
FF  
SHDN  
FB  
2
3
1
4
ON/OFF  
SHDN  
Thin SOT23-5  
TDFN  
3mm × 3mm × 0.8mm  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
1234567...12

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MAX8561ETA-T MAXIM

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 		Switching Regulator, Voltage-mode, 1.27A, 4000kHz Switching Freq-Max, BICMOS, 3 X 3 MM, 0.
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 		PLASTIC ENCAPSULATED DEVICES
MAX8562ETA MAXIM

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