MAX774

-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


Please check latest availability status for a specific part variant.

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

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
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
IOUT1
(A)
Output Adjust. MethodDC-DC OutputsOper. Freq.
(kHz)
Switch TypePackage/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX774 316.50-100-51Resistor1300External
CDIP/8
PDIP/8
SOIC (N)/8
$2.56 @1k
MAX775 -12
CDIP/8
PDIP/8
SOIC (N)/8
$2.54 @1k
MAX776 -15
CDIP/8
PDIP/8
SOIC (N)/8
$2.49 @1k
See All Inverting Switching Regulators (22)
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.


MAX774EVKIT: Evaluation Kit for the MAX774
MAX774IRGEVKIT: ISDN, Ring-Tone, Power Supply Evaluation Kit
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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