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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

Product Details

The Himalaya series of voltage regulator ICs, power modules, and chargers enable cooler, smaller, and simpler power-supply solutions. The MAX17552/ MAX17552A/MAX17552B high-efficiency, high-voltage, Himalaya 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 softstart allows the user to reduce the inrush currents. During overload, the MAX17552/MAX17552B 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-drainactive-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) TTDFN/TDFN-CU and 10-pin (3mm x 3mm) µMAX® packages. Simulation models are available.

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 Clock 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
    • High Industrial -40°C to +125°C Ambient Operating Temperature Range / -40°C to +150°C Junction 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
Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4
VIN (V) (max) 60
VOUT1 (V) (min) 0.8
VOUT1 (V) (max) 54
IOUT1 (A) (max) 0.1
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
ICC (mA) (typ) -
# DC-DC Outputs 1
Switching Frequency (kHz) 2200
Design Tools EE-Sim
Package/Pins TDFN/10
UMAX/10
Budgetary
Price (See Notes)
$1.16 @1k
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Simplified Block Diagram

MAX17552: Typical Application Circuit MAX17552: Typical Application Circuit Zoom icon

Design & Development

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Description

The MAX17552 5V evaluation kit (EV kit) (µMAX®) is a fully assembled and tested circuit board that demonstrates the performance of the MAX17552 60V, 100mA ultra-small, high-efficiency, synchronous step-down DC-DC converter in a 10-pin µMAX package. The EV kit operates over a wide input voltage range of 6V to 60V and provides up to 100mA load current at 5V output. It draws only 26µA supply current under no-load conditions (EN/UVLO connected to VIN). The EV kit is programmed to switch at a frequency of 220kHz and delivers a peak efficiency of 93% with the supplied components. The device is simple to use and easily configurable with minimal external components. It features cycle-by-cycle peak current-limit protection, undervoltage lockout and thermal shutdown.

The EV kit comes installed with the MAX17552AUB+ in an 10-pin (3mm x 3mm), lead(Pb)-free/RoHS-compliant µMAX package.

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Features

  • 6V to 60V Input Voltage Range
  • 5V Output, 100mA Continuous Current
  • 93% Peak Efficiency
  • 26µA No-Load Supply Current
  • EN/UVLO for On/Off Control and Programmable Input Undervoltage Lockout
  • Programmable Switching Frequency
  • Internal or Programmable Soft-Start
  • PFM or Forced-PWM Mode of Operation
  • Active-Low RESET Output
  • Peak Current-Limit Protection
  • Thermal Shutdown
  • Proven PCB Layout
  • Fully Assembled and Tested

Description

The MAX17552 5V evaluation kit (EV kit) (TDFN) is a fully assembled and tested circuit board that demonstrates the performance of the MAX17552 60V, 100mA ultra-small, high-efficiency, synchronous step-down DC-DC converter in a 10-pin TDFN package. The EV kit operates over a wide input-voltage range of 6V to 60V and provides up to 100mA load current at 5V output. It draws only 26µA supply current under no-load conditions (EN/UVLO connected to VIN). The EV kit is programmed to switch at a frequency of 220kHz and delivers a peak efficiency of 93% with the supplied components. The device is simple to use and easily configurable with minimal external components. It features cycle-by-cycle peak current limit protection, undervoltage lockout, and thermal shutdown.

The EV kit comes installed with the MAX17552ATB+ in an 10-pin (3mm x 2mm) lead(Pb)-free/RoHS-compliant TDFN package.

View Details

Features

  • 6V to 60V Input Voltage Range
  • 5V Output, 100mA Continuous Current
  • 93% Peak Efficiency
  • 26µA No Load Supply Current
  • EN/UVLO for On/Off Control and Programmable Input Undervoltage Lockout
  • Programmable Switching Frequency
  • Internal or Programmable Soft-Start
  • PFM or Forced-PWM Mode of Operation
  • Open-Drain Active-Low RESET Output
  • Peak Current Limit Protection
  • Thermal Shutdown
  • Proven PCB Layout
  • Fully Assembled and Tested

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Tools & Models

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Support & Training

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4
VIN (V) (max) 60
VOUT1 (V) (min) 0.8
VOUT1 (V) (max) 54
IOUT1 (A) (max) 0.1
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
ICC (mA) (typ) -
# DC-DC Outputs 1
Switching Frequency (kHz) 2200
Design Tools EE-Sim
Package/Pins TDFN/10
UMAX/10
Budgetary
Price (See Notes)
$1.16 @1k

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 Clock 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
    • High Industrial -40°C to +125°C Ambient Operating Temperature Range / -40°C to +150°C Junction 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

Description

The Himalaya series of voltage regulator ICs, power modules, and chargers enable cooler, smaller, and simpler power-supply solutions. The MAX17552/ MAX17552A/MAX17552B high-efficiency, high-voltage, Himalaya 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 softstart allows the user to reduce the inrush currents. During overload, the MAX17552/MAX17552B 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-drainactive-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) TTDFN/TDFN-CU and 10-pin (3mm x 3mm) µMAX® packages. Simulation models are available.

Simplified Block Diagram

MAX17552: Typical Application Circuit MAX17552: 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