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MAX774, MAX775, MAX776

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

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

Overview

Design Resources

Ordering Info

Status

Active: In Production.

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 V_IN - V_OUT 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.

Data Sheet

Download	Rev 2	(PDF, 328kB)
Email

An evaluation kit is available: MAX774EVKIT MAX774IRGEVKIT

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

Key Specifications:

Inverting Switching Regulators

Part Number

V_IN
(V)

V_OUT
(V)

Preset V_OUT
(V)

Max. I_OUT
(A)

Output Adjust. Method

DC-DC Outputs

Oper. Freq.
(kHz)

Budgetary
Price

min

max

min

max

≥

≤

See Notes

MAX774

16.5

-100

-5.0

Resistor

300

$2.42 @1k

MAX775

-12

$2.42 @1k

MAX776

-15

$2.37 @1k

See All Inverting Switching Regulators (25)

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 prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Typical Operating Circuit

Notes and Comments

Output Voltages Limited by External Components

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Information Index

Overview		Design Resources		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Technical Documents Evaluation Kits Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 19-0191 Rev 2; 2003-04-28
This page last modified: 2008-03-12

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