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MAX17634B

更新时间： 2023-12-20 18:44:02
品牌 Logo 应用领域
亚德诺 - ADI DC-DC转换器
页数 文件大小 规格书
22页 1195K
描述
4.5V至36V、4.25A、高效、同步降压型DC-DC转换器

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中文翻译

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MAX17634B 数据手册

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EVALUATION KIT AVAILABLE  
Click here for production status of specific part numbers.  
MAX17634A/MAX17634B/  
MAX17634C  
4.5V to 36V, 4.25A, High-Efficiency,  
Synchronous Step-Down DC-DC Converter  
General Description  
Benefits and Features  
The MAX17634x is a high-efficiency, high-voltage, synchro-  
nous step-down DC-DC converter with integrated MOSFETs  
operating over an input-voltage range of 4.5V to 36V. It can  
deliver up to 4.25A current. The MAX17634 is available in  
three variants: MAX17634A, MAX17634B, and MAX17634C.  
The MAX17634A and MAX17634B are fixed 3.3V and fixed  
5V output voltage parts, respectively. The MAX17634C is  
an adjustable output voltage (from 0.9V up to 90% of V )  
part. Built-in compensation across the output voltage range  
eliminates the need for external components.  
● Reduces External Components and Total Cost  
• No Schottky–Synchronous Operation  
• Internal Compensation Components  
• All-Ceramic Capacitors, Compact Layout  
● Reduces Number of DC-DC Regulators to Stock  
• Wide 4.5V to 36V Input  
• Adjustable Output Range from 0.9V up to 90% of V  
• 400kHz to 2.2MHz Adjustable Frequency with  
External Synchronization  
IN  
IN  
• Available in a 20-Pin, 4mm x 4mm TQFN Package  
The MAX17634x features peak-current-mode control  
architecture. The device can be operated in forced pulse-  
width modulation (PWM), pulse-frequency modulation (PFM),  
or discontinuous-conduction mode (DCM) to enable high  
efficiency under full-load and lightload conditions. The  
MAX17634x offers a low minimum on time that allows high  
switching frequencies and a smaller solution size.  
● Reduces Power Dissipation  
• Peak Efficiency of 94%  
• PFM and DCM Modes Enable Enhanced Light-  
Load Efficiency  
• Auxiliary Bootstrap Supply (EXTVCC) for Improved  
Efficiency  
• 2.8μA Shutdown Current  
The feedback voltage regulation accuracy over -40°C  
to +125°C for the MAX17634x is ±1.3%.The device is  
available in a compact 20-pin (4mm x 4mm) TQFN package.  
Simulation models are available.  
● Operates Reliably in Adverse Industrial Environments  
• Hiccup-Mode Overload Protection  
• Adjustable and Monotonic Startup with Prebiased  
Output Voltage  
• Built-in Output-Voltage Monitoring with RESET  
• Programmable EN/UVLO Threshold  
• Overtemperature Protection  
• High Industrial -40°C to +125°C Ambient Operating  
Temperature Range/-40°C to +150°C Junction  
Temperature Range  
Applications  
● Industrial Control Power Supplies  
● General-Purpose Point-of-Load  
● Distributed Supply Regulation  
● Base Station Power Supplies  
● Wall Transformer Regulation  
● High-Voltage, Single-Board Systems  
Ordering Information appears at end of data sheet.  
Typical Application Circuit  
V
IN  
6.5V–36V  
C1  
2 x 4.7µF  
EN/UVLO  
IN  
RT  
BST  
L1  
8.2µH  
C5  
0.1µF  
R5  
51.1kΩ  
MODE/SYNC  
V
OUT  
LX  
FB  
5V, 4.25A  
C4  
2 x 47µF  
INTVCC  
C3  
2.2µF  
MAX17634B  
SGND  
EXTVCC  
PGND  
C2  
5600pF  
EP  
SS  
f
400kHz  
SW :  
RESET  
L1: 8.2µH (XAL6060-822ME)  
C1: 4.7µF/50V/X7R/1206 (GRM31CR71H475KA12)  
C4: 47uF/10V/X7R/1210 (GRM32ER71A476ME15)  
19-100572; Rev 0; 6/19  
1234567...22

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