MAX17244

3.5V–36V, 2.5A, Synchronous Buck Converter With 28μA Quiescent Current and Reduced EMI

Extend Battery Life with Low Quiescent Current and Synchronous Conversion


Please check latest availability status for a specific part variant.

Description

The MAX17244 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 device can operate in dropout condition by running at 98% duty cycle. This converter delivers up to 2.5A and generates fixed output voltages of 3.3V/5V, along with the ability to program the output voltage between 1V to 10V.

The MAX17244 uses a current-mode control architecture. The device 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 either in PFM mode for reduced current consumption or fixed-frequency FPWM (forced-PWM) mode to eliminate frequency variation to minimize EMI. Fixed-frequency FPWM mode is extremely useful for power supplies designed for RF transceivers where tight emission control is necessary.

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.
MAX17244: Internal Block Diagram MAX17244: Internal Block Diagram Enlarge+

Key Features

  • 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
    • 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
  • 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

Applications/Uses

  • Distributed Supply Regulation
  • General-Purpose Point-of-Load
  • Wall Transformer Regulation

See parametric specs for Step-Down Switching Regulators (404)


Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
IOUT1
(A)
Switch TypeOper. Freq.
(kHz)
FeaturesDesign ToolsPackage/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX17244 3.5421102.5Internal
200
2200
Adjustable Freq.
Avg. Current Mode Control
Current Limit
External Sync.
Fixed Freq./PWM
Output UVP
Reset Output
EE-Sim
TQFN-CU/16
$2.43 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX17244EVKIT: Evaluation Kit for the MAX17244

Tools & Models

  • EE-Sim: Design & Simulate MAX17244
  • MAX17244 SIMPLIS Schematic
  • MAXREFDES1199 SIMPLIS Schematic
  • MAXREFDES1200 SIMPLIS Schematic
  • MAX17244 SIMPLIS Schematic
  • Request Reliability Report for: MAX17244 
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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