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60V, 50mA, 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

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 60
VOUT1 (V) (min) 0.8
VOUT1 (V) (max) 54
IOUT1 (A) (max) 0.05
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 TDFN/10
UMAX/10
Budgetary
Price (See Notes)
1.19
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 60
VOUT1 (V) (min) 0.8
VOUT1 (V) (max) 54
IOUT1 (A) (max) 0.05
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=4055', '')
Package/Pins TDFN/10
UMAX/10
Budgetary
Price (See Notes)
1.19

Key Features

  • Reduces External Components and Total Cost
    • No Schottky–Synchronous
    • Internal Compensation for Any Output Voltage
    • Built-In Soft-Start
    • All-ceramic capacitors, Compact Layout
  • Reduces Number of DC-DC Regulators to Stock
    • Wide 4V to 60V Input
    • Adjustable 0.8V to 0.9 x VIN Output
    • 100kHz to 2.2MHz Adjustable Switching Frequency with External Synchronization
  • Reduces Power Dissipation
    • 22µA Quiescent Current
    • Peak Efficiency > 90%
    • PFM Enables Enhanced Light-Load Efficiency
    • 1.2µA Shutdown Current
  • Operates Reliable in Adverse Environments
    • Peak Current Limit Protection
    • Built-In Output Voltage Monitoring Active-Low RESET
    • Programmable EN/UVLO Threshold
    • Monotonic Startup in to Prebiased Load
    • Overtemperature Protection
    • Overtemperature Protection • High Industrial -40°C to +125°C Ambient Operating Temperature Range / -40°C to +150°C Junction Temperature Range

Applications/Uses

  • Battery-Powered Equipment
  • High-Voltage LDO Replacement
  • HVAC and Building Control
  • Industrial Sensors and Process Control

Description

The MAX17551 high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operates over a 4V to 60V input. The converter can deliver up to 50mA and generates output voltages from 0.8V up to 0.9 x VIN. The feedback (FB) voltage is accurate to within ±1.75% over -40°C to +125°C.

The MAX17551 uses peak-current-mode control and can be operated in pulse-width modulation (PWM) or pulse-frequency modulation (PFM) modes.

The device is available in a 10-pin (3mm x 2mm) TDFN and 10-pin (5mm x 3mm) µMAX® packages. Simulation models are available.

Simplified Block Diagram

MAX17551: Typical Application Circuit MAX17551: Typical Application Circuit Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .