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-5V/-12V/-15V or Adjustable, High-Efficiency, Low-IQ DC-DC Inverters

Internal Power MOSFET Reduces Component Count and Saves Space

Product Details

The MAX764/MAX765/MAX766 inverting switching regulators are highly efficient over a wide range of load currents, delivering up to 1.5W. A unique, current-limited, pulse-frequency-modulated (PFM) control scheme combines the benefits of traditional PFM converters with the benefits of pulse-width-modulated (PWM) converters. Like PWM converters, the MAX764/MAX765/MAX766 are highly efficient at heavy loads. Yet because they are PFM devices, they use less than 120µA of supply current (vs. 2mA to 10mA for a PWM device).

The input voltage range is 3V to 16V. The output voltage is preset at -5V (MAX764), -12V (MAX765), or -15V (MAX766); it can also be adjusted from -1V to -16V using two external resistors (Dual Mode™). The maximum operating VIN - VOUT differential is 20V.

These devices use miniature external components; their high switching frequencies (up to 300kHz) allow for less than 5mm diameter surface-mount magnetics. A standard 47µH inductor is ideal for most applications, so no magnetics design is necessary.

An internal power MOSFET makes the MAX764/MAX765/ MAX766 ideal for minimum component count, low- and medium-power applications. For increased output drive capability or higher output voltages, use the MAX774/MAX775/MAX776 or MAX1774, which drive an external power P-channel MOSFET for loads up to 5W.

Key Features

  • High Efficiency for a Wide Range of Load Currents
  • 250mA Output Current
  • 120µA Max Supply Current
  • 5µA Max Shutdown Current
  • 3V to 16V Input Voltage Range
  • -5V (MAX764), -12V (MAX765), -15V (MAX766), or Adjustable Output from -1V to -16V
  • Current-Limited PFM Control Scheme
  • 300kHz Switching Frequency
  • Internal, P-Channel Power MOSFET

Applications/Uses

  • Battery-Powered Applications
  • LAN Adapters
  • LCD Bias Generators
  • Portable Instrumentation
  • Remote Data-Acquisition Systems
Parametric specs for Inverting Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 16.5
VOUT1 (V) (min) -1
VOUT1 (V) (max) -16
IOUT1 (A) (max) 0.12
Switch Type Internal
Preset VOUT (V) -12
Output Adjust. Method Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
$2.80 @1k
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Simplified Block Diagram

MAX764, MAX765, MAX766: Typical Operating Circuit MAX764, MAX765, MAX766: Typical Operating Circuit Zoom icon

Technical Docs

Design & Development

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Description

The MAX764 evaluation kit (EV kit) is a fully assembled and tested surface-mount printed circuit board that provides a regulated -5.0V output voltage from a 3V to 16V input voltage source. It drives loads up to 250mA with conversion efficiency greater than 82%.

The MAX764 EV kit can also be used to evaluate the MAX765CSA (-12V output) or MAX766 (-15V output). Additional pads are provided on the board's solder side to accommodate external feedback resistors for setting different output voltages.

View Details

Features

  • -5V or Adjustable Output Voltage
  • Up to 250mA Output Current
  • 120µA Max Supply Current
  • 5µA Max Shutdown Current
  • 300kHz Switching Frequency
  • Internal Power MOSFET
  • 8-Pin SO Package
  • Surface-Mount Construction
  • Fully-Assembled and Tested

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Support & Training

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Parameters

Parametric specs for Inverting Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 16.5
VOUT1 (V) (min) -1
VOUT1 (V) (max) -16
IOUT1 (A) (max) 0.12
Switch Type Internal
Preset VOUT (V) -12
Output Adjust. Method Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
$2.80 @1k

Key Features

  • High Efficiency for a Wide Range of Load Currents
  • 250mA Output Current
  • 120µA Max Supply Current
  • 5µA Max Shutdown Current
  • 3V to 16V Input Voltage Range
  • -5V (MAX764), -12V (MAX765), -15V (MAX766), or Adjustable Output from -1V to -16V
  • Current-Limited PFM Control Scheme
  • 300kHz Switching Frequency
  • Internal, P-Channel Power MOSFET

Applications/Uses

  • Battery-Powered Applications
  • LAN Adapters
  • LCD Bias Generators
  • Portable Instrumentation
  • Remote Data-Acquisition Systems

Description

The MAX764/MAX765/MAX766 inverting switching regulators are highly efficient over a wide range of load currents, delivering up to 1.5W. A unique, current-limited, pulse-frequency-modulated (PFM) control scheme combines the benefits of traditional PFM converters with the benefits of pulse-width-modulated (PWM) converters. Like PWM converters, the MAX764/MAX765/MAX766 are highly efficient at heavy loads. Yet because they are PFM devices, they use less than 120µA of supply current (vs. 2mA to 10mA for a PWM device).

The input voltage range is 3V to 16V. The output voltage is preset at -5V (MAX764), -12V (MAX765), or -15V (MAX766); it can also be adjusted from -1V to -16V using two external resistors (Dual Mode™). The maximum operating VIN - VOUT differential is 20V.

These devices use miniature external components; their high switching frequencies (up to 300kHz) allow for less than 5mm diameter surface-mount magnetics. A standard 47µH inductor is ideal for most applications, so no magnetics design is necessary.

An internal power MOSFET makes the MAX764/MAX765/ MAX766 ideal for minimum component count, low- and medium-power applications. For increased output drive capability or higher output voltages, use the MAX774/MAX775/MAX776 or MAX1774, which drive an external power P-channel MOSFET for loads up to 5W.

Simplified Block Diagram

MAX764, MAX765, MAX766: Typical Operating Circuit MAX764, MAX765, MAX766: Typical Operating Circuit Zoom icon

Technical Docs

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