MAX774-MAX776 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

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MAX774-MAX776

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

Maxim Integrated 

19-0191; Rev 1; 3/94

EVAALVUAAILTAIOBNLEKIT

-5V/-12V/-15V or Adjustable,

High-Efficiency, Low IQ Inverting DC-DC Controllers

_______________General 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 sup-

ply 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 switch-

es, 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.

________________________Applications

LCD-Bias Generators

High-Efficiency DC-DC Converters

Battery-Powered Applications

Data Communicators

____________________________Features

o 85% Efficiency for 5mA to 1A Load Currents

o Up to 5W Output Power

o 100µA Max Supply Current

o 5µA Max Shutdown Current

o 3V to 16.5V Input Range

o -5V (MAX774), -12V (MAX775), -15V (MAX776),

or Adjustable Output Voltage

o Current-Limited PFM Control Scheme

o 300kHz Switching Frequency

______________Ordering Information

PART

MAX774CPA

MAX774CSA

MAX774C/D

MAX774EPA

MAX774ESA

MAX774MJA

TEMP. RANGE

0°C to +70°C

0°C to +70°C

0°C to +70°C

-40°C to +85°C

-40°C to +85°C

-55°C to +125°C

PIN-PACKAGE

8 Plastic DIP

8 SO

Dice*

8 Plastic DIP

8 SO

8 CERDIP

Ordering Information continued on last page.

* Contact factory for dice specifications.

__________Typical Operating Circuit

INPUT

3V TO 16V

V+

ON/OFF

MAX774 CS

SHDN

EXT

P

FB

REF

OUT

GND

OUTPUT

-5V

__________________Pin Configuration

TOP VIEW

OUT 1

FB 2

SHDN 3

REF 4

MAX774

MAX775

MAX776

DIP/SO

8 GND

7 EXT

6 CS

5 V+

________________________________________________________________ Maxim Integrated Products 1

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