Analog Devices / Maxim Integrated MAX17242 & MAX17243 Step-Down DC-DC Converters
Analog Devices MAX17242 and MAX17243 Synchronous Step-Down DC-DC Converters come with integrated MOSFETs and operate over a 3.5V to 36.0V input voltage range. They can also operate in drop-out conditions at a 99% duty cycle. The converters deliver up to 2A (MAX17242) or 3A (MAX17243) output current, generating fixed output voltages of 3.3V and 5.0V. They also can program the output voltage between 1V to 10V. The devices use a current-mode-control architecture and can be operated in the Pulse-Width Modulation (PWM) or Pulse Frequency Modulation (PFM) control schemes.
The PWM operation provides constant frequency operation at all loads and is helpful in applications sensitive to switching frequency. PFM operation disables negative inductor current, and skips pulse at light loads for high-efficiency operation. The low-resistance, on-chip MOSFETs ensure high efficiency at full load and simplify the layout.
The Analog Devices MAX17242 and MAX17243 Step-Down DC-DC Converters are available in a compact 20-pin (5mm x 5mm) TQFN package with an exposed pad for improved thermal performance.
Features
- Eliminates external components and reduces total cost
- No Schottky-synchronous operation for high efficiency and reduced cost
- Simple external RC compensation for stable operation at any output voltage
- All-ceramic capacitor solution for an ultra-compact layout with as few as eight external components
- PGOOD output and high-voltage EN input simplify power sequencing
- Reduces the number of DC-DC converters to stock pin compatibility for 2A/3A options
- Fixed output voltage with ±2% accuracy (5.0V/3.3V) or externally resistor adjustable (1V to 10V) with ±1% FB accuracy
- 220kHz to 2.2MHz adjustable frequency with external synchronization
- Reduces power dissipation
- 93% peak efficiency
- Shutdown feature blocks current flow from input to output or vice-versa
- Less than 5µA (typical) in shutdown
- Low 15µA (typical) quiescent current in standby mode
- Operates reliably
- 42V input voltage transient protection
- Fixed 8ms internal software start reduces input inrush current
- Cycle-by-cycle current limit, thermal shutdown with automatic recovery
- Reduced EMI emission with spread-spectrum control
- Package
- -40°C to +85°C operating temperature range
- 5mm x 5mm TQFN-20
- Pb-free and RoHS compliant
Applications
- Distributed Supply Regulation
- Wall Transformer Regulation
- General-Purpose Point-of-Load
Resources
Videos
Development Tools
Analog Devices / Maxim Integrated MAX17242EVKIT & MAX14243EVKIT Evaluation Kits
Demonstrates the MAX17242 and MAX17243 high-voltage, current mode step-down converters.
Analog Devices Inc. MAXESSENTIAL02EP Essential Power Toolkit
Provides products on ready-to-use boards for immediate testing and prototyping.
Typical Application Circuit
Block Diagram
