Rainbow-electronics MAX776 Bedienungsanleitung PDF herunterladen

_______________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

- 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 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

♦ 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

______________Ordering Information

Ordering Information continued on last page.

* Contact factory for dice specifications.

MAX774/MAX775/MAX776

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

High-Efficiency, Low I

Inverting DC-DC Controllers

________________________________________________________________

Maxim Integrated Products

MAX774

MAX775

MAX776

DIP/SO

TOP VIEW

GND

EXT

V+

OUT

SHDN

REF

__________________Pin Configuration

MAX774

OUTPUT

-5V

REF

SHDN

GND

V+

EXT

OUT

ON/OFF

INPUT

3V TO 16V

__________Typical Operating Circuit

Call toll free 1-800-998-8800 for free samples or literature.

PART TEMP. RANGE PIN-PACKAGE

MAX774CPA

0°C to +70°C 8 Plastic DIP

MAX774CSA 0°C to +70°C 8 SO

MAX774C/D 0°C to +70°C Dice*

MAX774EPA -40°C to +85°C 8 Plastic DIP

MAX774ESA -40°C to +85°C 8 SO

MAX774MJA -55°C to +125°C 8 CERDIP

19-0191; Rev 1; 3/94

EVALUATION KIT

AVAILABLE

1 2 3 4 5 6 ... 15 16

Inhaltsverzeichnis

Seite 1 - Inverting DC-DC Controllers

_______________General DescriptionThe MAX774/MAX775/MAX776 inverting switching regulators deliver high efficiency over three decades ofload current.

Seite 2

MAX774/MAX775/MAX776With light loads, the MOSFET switches on for one ormore cycles and then switches off, much like in tradi-tional PFM converters. T

Seite 3

using bootstrapped or non-bootstrapped mode willdirectly affect the gate drive to the FET. EXT swingsfrom V+ to VOUT. In bootstrapped operation, OUT

Seite 4

MAX774/MAX775/MAX776Choosing an InductorPractical inductor values range from 10µH to 50µH.The maximum inductor value is not particularly critical.For

Seite 5

To choose the proper current-sense resistor, simply fol-low the two-step procedure outlined below.1) Determine:• Input voltage range, V+ • Maximum (ab

Seite 6

CapacitorsChoose the output capacitor (C4 of Figures 2, 3, and 4)to be consistent with your size, ripple, and output volt-age requirements. Place capa

Seite 7

MAX774/MAX775/MAX776-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQInverting DC-DC Controllers___________________________________________________

Seite 8

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses arei

Seite 9

MAX774/MAX775/MAX776-5V/-12V/-15V or Adjustable,High-Efficiency, Low IQInverting DC-DC Controllers2 __________________________________________________

Seite 10

MAX774/MAX775/MAX776-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQInverting DC-DC Controllers___________________________________________________

Seite 11

MAX774/MAX775/MAX776-5V/-12V/-15V or Adjustable,High-Efficiency, Low IQInverting DC-DC Controllers4 __________________________________________________

Seite 12

MAX774/MAX775/MAX776-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQInverting DC-DC Controllers___________________________________________________

Seite 13

MAX774/MAX775/MAX776-5V/-12V/-15V or Adjustable,High-Efficiency, Low IQInverting DC-DC Controllers6 __________________________________________________

Seite 14

MAX774/MAX775/MAX776-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQInverting DC-DC Controllers___________________________________________________

Seite 15

MAX774/MAX775/MAX776-5V/-12V/-15V or Adjustable,High-Efficiency, Low IQInverting DC-DC Controllers8 __________________________________________________

Seite 16

_______________Detailed DescriptionThe MAX774/MAX775/MAX776 are negative-output,inverting power controllers that can be configured to drivean external

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Rainbow-electronics MAX776 Bedienungsanleitung

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