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Switching Regulator - Switching Regulators 
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MAX17543
4.5V-42V, 2.5A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation
Wide Input Voltage, 2.5A Internal FET Synchronous Buck Converter Ideal for Industrial Applications
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Key Features
Applications/Uses
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 4.5 |
| VIN (V) (max) | 42 |
| VOUT1 (V) (min) | 0.9 |
| VOUT1 (V) (max) | 36 |
| IOUT1 (A) (max) | 2.5 |
| Switch Type | Internal |
| Output Adjust. Method | Resistor |
| Synchronous Switching? | Yes |
| Power Good Signal | Yes |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 2200 |
| Design Tools | EE-Sim |
| Package/Pins | TQFN-CU/20 |
| Budgetary Price (See Notes) | 1.95 |
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Parameters
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 4.5 |
| VIN (V) (max) | 42 |
| VOUT1 (V) (min) | 0.9 |
| VOUT1 (V) (max) | 36 |
| IOUT1 (A) (max) | 2.5 |
| Switch Type | Internal |
| Output Adjust. Method | Resistor |
| Synchronous Switching? | Yes |
| Power Good Signal | Yes |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 2200 |
| Design Tools | generateDesignEESIMUrl('http://maxim.transim.com/pwm2/designreq/Index?partId=3119', '') |
| Package/Pins | TQFN-CU/20 |
| Budgetary Price (See Notes) | 1.95 |
Key Features
- Reduces External Components and Total Cost
- No Schottky—Synchronous Operation
- Internal Compensation for Any Output Voltage
- Built-In Soft-Start
- All-Ceramic Capacitors, Compact Layout
- Reduces Number of DC-DC Regulators to Stock
- Wide 4.5V to 42V Input
- Adjustable 0.9V to 0.9 x VIN Output
- 100kHz to 2.2MHz Adjustable Switching Frequency with External Synchronization
- Reduces Power Dissipation
- Peak Efficiency >90%
- PFM/DCM Enables Enhanced Light-Load Efficiency
- 2.8µA Shutdown Current
- Operates Reliably in Adverse Industrial Environments
- Peak Current-Limit Protection
- Built-In Output Voltage Monitoring with Active-Low RESET
- Programmable EN/UVLO Threshold
- Monotonic Startup into Prebiased Load
- Overtemperature Protection
- High Industrial -40°C to +125°C Ambient Operating Temperature Range/-40°C to +150°C Junction Temperature Range
Applications/Uses
- Base Station Power Supply
- Distributed Supply Regulation
- General-Purpose Point-of-Load
- High-Voltage Single-Board Systems
- Industrial Power Supplies
Description
The MAX17543 high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operates over a 4.5V to 42V input. The converter can deliver up to 2.5A and generates output voltages from 0.9V up to 0.9 x VIN. The feedback (FB) voltage is accurate to within ±1.1% over -40°C to +125°C.
The MAX17543 uses peak current-mode control. The device can be operated in the pulse-width modulation (PWM), pulse-frequency modulation (PFM), or discontinuous conduction mode (DCM) control schemes.
The device is available in a 20-pin (4mm × 4mm) TQFN package. Simulation models are available.
The MAX17543 uses peak current-mode control. The device can be operated in the pulse-width modulation (PWM), pulse-frequency modulation (PFM), or discontinuous conduction mode (DCM) control schemes.
The device is available in a 20-pin (4mm × 4mm) TQFN package. Simulation models are available.
Technical Docs
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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