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MAX17245ETERA+

更新时间： 2024-11-21 01:07:43
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美信 - MAXIM /
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17页 1088K
描述
Eliminates External Components and Reduces

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MAX17245ETERA+ 数据手册

 浏览型号MAX17245ETERA+的Datasheet PDF文件第2页浏览型号MAX17245ETERA+的Datasheet PDF文件第3页浏览型号MAX17245ETERA+的Datasheet PDF文件第4页浏览型号MAX17245ETERA+的Datasheet PDF文件第5页浏览型号MAX17245ETERA+的Datasheet PDF文件第6页浏览型号MAX17245ETERA+的Datasheet PDF文件第7页 
EVALUATION KIT AVAILABLE  
MAX17245  
3.5V–36V, 3.5A, Synchronous Buck Converter  
With 28μA Quiescent Current and Reduced EMI  
General Description  
Benefits and Features  
The MAX17245 high-efficiency, synchronous step-down  
DC-DC converter with integrated MOSFETs operates  
over a 3.5V to 36V input voltage range with 42V input  
transient protection. The MAX17245 can operate in drop-  
out condition by running at 98% duty cycle. This converter  
delivers up to 3.5A and generates fixed output voltages of  
3.3V/5V, along with the ability to program the output voltage  
between 1V to 10V.  
●
Eliminates External Components and Reduces  
Total Cost  
• Integrated High-Side and Low-Side Switch Enables  
Synchronous Operation for High Efficiency and  
Reduced Cost  
• All-Ceramic Capacitor Solution Allows  
Ultra-Compact Solution Size  
• 220kHz to 2.2MHz Adjustable Frequency with  
External Synchronization  
The MAX17245 uses a current-mode control architecture  
and can operate in the pulse-width modulation (PWM)  
or pulse-frequency modulation (PFM) control schemes.  
PWM operation provides constant frequency operation at  
all loads and is useful in applications sensitive to switching  
frequency. PFM operation disables negative inductor  
current and additionally skips pulses at light loads for  
high efficiency. Under light-load applications, the external  
sync pin FSYNC logic input allows the device to operate  
in either PFM mode for reduced current consumption or  
fixed-frequency PWM (forced-PWM) mode to eliminate  
frequency variation to minimize EMI. Fixed-frequency  
PWM mode is extremely useful for power supplies  
designed for RF transceivers where tight emission control  
is necessary.  
• Power Good Output and High-Voltage EN Input  
Simplify Power Sequencing  
●
●
Increases Design Flexibility  
• 180° Out-of-Phase Clock Output at SYNCOUT  
Enables Cascaded Power Supplies for Increased  
Power Output  
• Fixed Output Voltage with ±2% Accuracy (5V/3.3V)  
or Externally Resistor Adjustable (1V to 10V)  
Reduces Power Dissipation  
• >90% Peak Efficiency  
• PWM and PFM Operation Optimizes Conversion  
Efficiency From Heavy to Light Loads  
• Automatic LX Slew-Rate Adjustment for Optimum  
Efficiency Across Operating Frequency Range  
• Low 5μA (typ.) Shutdown Current  
• Low 28μA (typ.) Quiescent Current  
This device is available in a compact 16-pin (5mm x 5mm)  
TQFN package with exposed pad and 16-pin TSSOP.  
-40°C to +85°C operation.  
●
Operates Reliably  
• 42V Input Voltage Transient Protection  
• Fixed 8ms Internal Software Start Reduces Input  
Inrush Current  
Typical Application Circuit  
V
BAT  
• Cycle-by-Cycle Current limit, Thermal Shutdown  
with Automatic Recovery  
C
IN2  
4.7µF  
C
4.7µF  
IN3  
C
IN1  
R
___  
0I  
• Reduced EMI Emission with Spread-Spectrum  
Control  
C
0.1µF  
BST  
SUP  
SUPSW  
BST  
L1  
2.2µH  
V
OUT  
EN  
5V AT 3.5A  
LX  
OSC SYNC PULSE  
FSYNC  
COMP  
V
D1  
C
OUT  
OUT  
22µF  
Applications  
V
BIAS  
R
SNUB*  
OUT  
FB  
C
SNUB*  
●
●
●
Distributed Supply Regulation  
Wall Transformer Regulation  
General-Purpose Point-of-Load  
C
COMP1  
1000pF  
R
MAX17245  
FOSC  
12kI  
C
COMP2  
12pF  
V
V
BIAS  
OUT  
R
COMP  
20kI  
FOSC  
BIAS  
R
R
SYNCOUT  
100I  
PGOOD  
10kI  
PGOOD  
POWER-GOOD OUTPUT  
180° OUT-OF-PHASE OUTPUT  
C
BIAS  
1µF  
SYNCOUT  
PGND AGND  
*R  
= 1Iand C = 220pF required for  
SNUB  
SNUB  
the following operating conditions:  
25V, V 5V, f  
Ordering Information/Selector Guide appears at end of data  
sheet.  
V
BAT  
R
P
R 1.8MHz,  
OUT SW  
FPWM mode enabled  
19-8527; Rev 0; 4/16  
1234567...17

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