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-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-to-DC Controllers

Negative LCD Bias Supply Is Capable of Generating Very High Negative Voltages, Delivers Up to 1A

Product Details

Key Features

Parametric specs for Inverting Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 16.5
VOUT1 (V) (min) 0
VOUT1 (V) (max) -100
IOUT1 (A) (max) 1
Switch Type External
Preset VOUT (V) -15
Output Adjust. Method Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
2.64
View Less

Simplified Block Diagram

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Parameters

Parametric specs for Inverting Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 16.5
VOUT1 (V) (min) 0
VOUT1 (V) (max) -100
IOUT1 (A) (max) 1
Switch Type External
Preset VOUT (V) -15
Output Adjust. Method Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
2.64

Key Features

  • 85% Efficiency for 5mA to 1A Load Currents
  • Up to 5W Output Power
  • 100µA (max) Supply Current
  • 5µA (max) Shutdown Current
  • 3V to 16.5V Input Range
  • -5V (MAX774), -12V (MAX775), -15V (MAX776), or Adjustable Output Voltage
  • Current-Limited PFM Control Scheme
  • 300kHz Switching Frequency

Applications/Uses

  • Battery-Powered Applications
  • Data Communications
  • High-Efficiency DC-DC Converters
  • LCD Bias Generators

Description

The MAX774/MAX775/MAX776 inverting switching regulators deliver high efficiency over three decades of load current. A unique current-limited, pulse-frequency modulated (PFM) control scheme provides the benefits of pulse-width modulation (high efficiency with heavy loads), while using less than 100µA of supply current (vs. 2mA to 10mA for PWM converters). The result is high efficiency over a wide range of loads.

These ICs also use tiny external components; their high switching frequency (up to 300kHz) allows for less than 5mm diameter surface-mount magnetics.

The MAX774/MAX775/MAX776 accept input voltages from 3V to 16.5V, and have preset output voltages of -5V, -12V, and -15V, respectively. Or, the output voltage can be user-adjusted with two resistors. Maximum VIN - VOUT differential voltage is limited only by the break-down voltage of the chosen external switch transistor.

These inverters use external P-channel MOSFET switches, allowing them to power loads up to 5W. If less power is required, use the MAX764/MAX765/MAX766 inverting switching regulators with on-board MOSFETs.

Simplified Block Diagram

MAX774, MAX775, MAX776: Typical Operating Circuit MAX774, MAX775, MAX776: 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 .