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MAX15462AATA

更新时间： 2024-09-17 02:52:07
品牌 Logo 应用领域
美信 - MAXIM /
页数 文件大小 规格书
23页 2478K
描述
42V, 300mA, Ultra-Small, High-Efficiency Synchronous Step-Down DC-DC Converters

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MAX15462AATA 数据手册

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EVALUATION KIT AVAILABLE  
MAX15462  
42V, 300mA, Ultra-Small, High-Efficiency,  
Synchronous Step-Down DC-DC Converters  
General Description  
Benefits and Features  
● Eliminates External Components and Reduces  
The MAX15462 high-efficiency, high-voltage, synchronous  
step-down DC-DC converter with integrated MOSFETs  
operates over a 4.5V to 42V input voltage range. The  
converter delivers output current up to 300mA at 3.3V  
(MAX15462A), 5V (MAX15462B), and adjustable output  
voltages (MAX15462C). The device operates over the  
-40°C to +125°C temperature range and is available in a  
compact 8-pin (2mm x 2mm) TDFN package. Simulation  
models are available.  
Total Cost  
• No Schottky—Synchronous Operation for High  
Efficiency and Reduced Cost  
• Internal Compensation  
• Internal Feedback Divider for Fixed 3.3V, 5V  
Output Voltages  
• Internal Soft-Start  
• All-Ceramic Capacitors, Ultra-Compact Layout  
● Reduces Number of DC-DC Regulators to Stock  
• Wide 4.5V to 42V Input Voltage Range  
• Fixed 3.3V and 5V Output Voltage Options  
The device employs a peak-current-mode control  
architecture with a MODE pin that can be used to  
operate the device 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 variable  
switching frequency. PFM operation disables negative induc-  
tor current and additionally skips pulses at light loads for high  
efficiency. The low-resistance on-chip MOSFETs ensure high  
efficiency at full load and simplify the PCB layout.  
• Adjustable 0.9V to 0.89 x V Output Voltage Option  
IN  
• Delivers Up to 300mA Load Current  
• Configurable Between PFM and Forced-PWM  
Modes  
● Reduces Power Dissipation  
• Peak Efficiency = 92%  
• PFM Feature for High Light-Load Efficiency  
• Shutdown Current = 2.2µA (typ)  
● Operates Reliably in Adverse Industrial Environments  
• Hiccup-Mode Current Limit and Autoretry Startup  
• Built-In Output Voltage Monitoring with Open-Drain  
RESET Pin  
To reduce input inrush current, the device offers an  
internal soft-start. The device also incorporates an EN/  
UVLO pin that allows the user to turn on the part at the  
desired input-voltage level. An open-drain RESET pin can  
be used for output-voltage monitoring.  
• Programmable EN/UVLO Threshold  
• Monotonic Startup into Prebiased Output  
• Overtemperature Protection  
Applications  
● Process Control  
● Industrial Sensors  
● 4–20mA Current Loops  
● HVAC and Building Control  
● High-Voltage LDO Replacement  
● General-Purpose Point of Load  
• High Industrial -40°C to +125°C Ambient Operating  
Temperature Range/-40°C to +150°C Junction  
Temperature Range  
Ordering Information appears at end of data sheet.  
Typical Operating Circuit  
L1  
V
OUT  
33µH  
V
IN  
3.3V,  
300mA  
4.5V TO  
42V  
V
LX  
IN  
C
1µF  
IN  
C
10µF  
OUT  
EN/UVLO  
GND  
MAX15462A  
V
CC  
RESET  
C
VCC  
1µF  
V
MODE  
OUT  
19-7552; Rev 1; 2/17  
1234567...23

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