MAX17552

60V, 100mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter with 22μA No-Load Supply Current

60V, Low IQ Synchronous Buck Regulator Enables High Efficiency


Description

The MAX17552/MAX17552A high-efficiency, high-voltage, synchronous step-down DC-DC converters with integrated MOSFETs operate over a 4V to 60V input voltage range. The converters can deliver output current up to 100mA at output voltages of 0.8V to 0.9 x VIN. The output voltage is accurate to within ±1.75% over the -40°C to +125°C temperature range.

The devices employ a peak-current-mode control architecture with a MODE pin that can be used to operate the device in 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 inductor current and additionally skips pulses at light loads for high efficiency. The converters consume only 22µA of no-load supply current in PFM mode. The low-resistance, on-chip MOSFETs ensure high efficiency at full load and simplify PCB layout.

The devices offer programmable switching frequency to optimize solution size and efficiency. Programmable soft-start allows the user to reduce the inrush currents. During overload, the MAX17552 implements a hysteretic cycle-by-cycle peak-current-limit protection scheme, while the MAX17552A implements a HICCUP-type overload protection scheme to protect the inductor and the internal FETs. An EN/UVLO pin allows the user to turn on/off the device at the desired input-voltage level. An open-drain active-low RESET pin allows output-voltage monitoring. The devices operate over the -40°C to +125°C industrial temperature range and is available in a compact 10-pin (3mm x 2mm) TDFN and 10-pin (3mm x 3mm) μMAX® packages. Simulation models are available.

MAX17552: Typical Application Circuit MAX17552: Typical Application Circuit Enlarge+

Key Features

  • Eliminates External Components and Reduces Total Cost
    • No Schottky—Synchronous Operation for High Efficiency and Reduced Cost
    • Internal Compensation
    • Fixed Internal 5.1ms or Programmable Soft-Start
    • All-Ceramic Capacitors, Ultra-Compact Layout
  • Reduces Number of DC-DC Regulators to Stock
    • Wide 4V to 60V Input Voltage Range
    • Adjustable 0.8V to 0.9 x VIN Output Voltages
    • Delivers Up to 100mA Load Current
    • 100kHz to 2.2MHz Adjustable Switching Frequency Range with External Synchronization
    • Configurable Between PFM and Forced-PWM Modes
  • Reduces Power Dissipation
    • 22µA No Load Supply Current
    • Peak Efficiency > 90%
    • PFM Feature for High Light-Load Efficiency
    • 1.2µA (typ) Shutdown Current
  • Operates Reliably in Adverse Industrial Environments
    • Peak Current-Limit Protection
    • Built-In Output-Voltage Monitoring with Open-Drain Active-Low RESET Pin
    • Programmable EN/UVLO Threshold
    • Monotonic Startup into Prebiased Output
    • Overtemperature Protection
    • -40°C to +125°C Industrial/Automotive Temperature Range

Applications/Uses

  • 4–20mA Current-Loop Powered Sensors
  • Battery-Powered Equipment
  • General-Purpose Point-of-Load
  • High-Voltage LDO Replacement
  • HVAC and Building Control
  • Industrial Sensors and Process Control
Part Number VIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Output Adjust. Method IOUT1
(A)
Switch Type Synchronous Switching Power Good Signal DC-DC Outputs Oper. Freq.
(kHz)
Design Tools Package/Pins Budgetary
Price
min max min max max See Notes
MAX17552  4 60 0.8 54 Resistor 0.1 Internal Yes Yes 1 2200 EE-Sim
µMAX/10
TDFN/10
$1.10 @1k
See All Step-Down Switching Regulators (316)
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.


MAX17552AUBEVKIT: Evaluation Kit for the MAX17552 (µMAX) in 5V Output-Voltage Application
MAX17552ATBEVKIT: Evaluation Kit for the MAX17552 (TDFN) in 5V Output Voltage Applications

Tools & Models

Design & Simulate MAX17552

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