MAX763ACPA Maxim Integrated Products, MAX763ACPA Datasheet

MAX763ACPA

Manufacturer Part Number

MAX763ACPA

Description

Step-down, current-mode PWM DC-DC controller. Input voltage range 3.3V to 11V

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX763ACPA.pdf (12 pages)

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The MAX748A/MAX763A are 3.3V-output CMOS, step-

down switching regulators. The MAX748A accepts

inputs from 3.3V to 16V and delivers up to 500mA. The

MAX763A accepts inputs between 3.3V and 11V and

delivers up to 500mA. Typical efficiencies are 85% to

90%. Quiescent supply current is 1.4mA (MAX763A),

and only 0.2µA in shutdown.

Pulse-width-modulation (PWM) current-mode control pro-

vides precise output regulation and excellent transient

responses. Output voltage accuracy is guaranteed to be

±5% over line, load, and temperature variations.

Fixed-frequency switching allows easy filtering of output

ripple and noise, as well as the use of small external

components. A 22µH inductor works in most applica-

tions, so no magnetics design is necessary.

The MAX748A/MAX763A also feature cycle-by-cycle cur-

rent limiting, overcurrent limiting, undervoltage lockout,

and programmable soft-start protection. The MAX748A

is available in 8-pin DIP and 16-pin wide SO packages;

the MAX763A comes in 8-pin DIP and SO packages.

19-0190; Rev 0; 9/93

____________Typical Operating Circuit

__________________General Description

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

___________________________Applications

3.3V TO 16V

INPUT

ON/OFF

5V-to-3.3V Converters

Cellular Phones

Portable Instruments

Hand-Held Computers

Computer Peripherals

SHDN

REF

MAX748A

_______________________________________________________________________ Maxim Integrated Products

V+

GND

Current-Mode PWM DC-DC Converters

OUT

22 H

100 F

OUTPUT

3.3V

Ordering Information continued on last page.

* Contact factory for dice specifications.

_________________Ordering Information

________________________________Features

____________________Pin Configurations

MAX748ACPA

MAX748ACWE

MAX748AC/D

MAX748AEPA

MAX748AEWE

MAX748AMJA

Up to 500mA Load Currents

Guaranteed 159kHz to 219.5kHz Current-Mode

PWM

85% to 90% Efficiencies

1.7mA Quiescent Current (MAX748A)

1.4mA Quiescent Current (MAX763A)

0.2µA Shutdown Supply Current

22µH Preselected Inductor Value;

No Component Design Required

Overcurrent, Soft-Start, and Undervoltage

Lockout Protection

Cycle-by-Cycle Current Limiting

8-Pin DIP/SO Packages (MAX763A)

Pin Configurations continued on last page.

TOP VIEW

PART

3.3V, Step-Down,

SHDN

REF

-40°C to +85°C

-55°C to +125°C

TEMP. RANGE

0°C to +70°C

MAX748A

MAX763A

DIP

PIN-PACKAGE

8 Plastic DIP

16 Wide SO

Dice*

8 Plastic DIP

16 Wide SO

8 CERDIP

V+

GND

OUT

Related parts for MAX763ACPA

MAX763ACPA Summary of contents

Page 1

... V+ LX MAX748A ON/OFF SHDN OUT REF CC SS GND _______________________________________________________________________ Maxim Integrated Products Call toll free 1-800-998-8800 for free samples or literature. 3.3V, Step-Down, ________________________________Features Up to 500mA Load Currents Guaranteed 159kHz to 219.5kHz Current-Mode PWM 85% to 90% Efficiencies 1.7mA Quiescent Current (MAX748A) 1.4mA Quiescent Current (MAX763A) 0.2µ ...

Page 2

Step-Down, Current-Mode PWM DC-DC Converters ABSOLUTE MAXIMUM RATINGS Pin Voltages: V+ (MAX748A) ......................................................+17V, -0.3V V+ (MAX763A) ......................................................+12V, -0.3V LX (MAX748A) .................................(V+ - 21V) to (V+ + 0.3V) LX (MAX763A) .................................(V+ - 12V) to (V+ + 0.3V) OUT .................................................................................±25V SS, ...

Page 3

Current-Mode PWM DC-DC Converters ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 5V 0mA, T LOAD PARAMETER CONDITIONS I LOAD Efficiency LOAD Supply Current Includes switch current SHDN = 0V (Note 1) Shutdown ...

Page 4

Step-Down, Current-Mode PWM DC-DC Converters ____________________________Typical Operating Characteristics (continued) (Circuit of Figure +25° 3.3V, unless otherwise noted.) A OUT MAX763A QUIESCENT SUPPLY CURRENT vs. SUPPLY VOLTAGE 4.5 4.0 I OUT = 0mA 3.5 T ...

Page 5

Current-Mode PWM DC-DC Converters _________________________________Typical Operating Characteristics (continued) (Circuit of Figure +25° 3.3V, unless otherwise noted.) A OUT SWITCHING WAVEFORMS, CONTINUOUS CONDUCTION 2 s/div A: SWITCH VOLTAGE (LX PIN), 5V/div +6V B: INDUCTOR ...

Page 6

Step-Down, Current-Mode PWM DC-DC Converters _______________________________________________________________________Pin Description PIN # 16-PIN WIDE SO NAME 8-PIN DIP/SO (MAX748A) SHDN REF OUT 6 10, 11 GND 7 12, 13, 14 ...

Page 7

Current-Mode PWM DC-DC Converters SHDN BIAS GEN OUT ERROR AMP C5 330pF CC 1.23V BANDGAP REF C6 1000pF 1M ±35 0.047 F GND Figure 1. Detailed Block Diagram with External Components FROM SHDN SS CLAMP SS 1M ±35% ...

Page 8

Step-Down, Current-Mode PWM DC-DC Converters Table 3. External Component Suppliers Production Method Surface Mount High Performance/ Miniature Through-Hole Through-Hole Phone and FAX Numbers: Coilcraft USA: (708) 639-6400, FAX: (708) 639-1469 Coiltronics USA: (305) 781-8900, FAX: (305) 782-4163 Matsuo USA: ...

Page 9

Current-Mode PWM DC-DC Converters INPUT MAX748A 3.3V TO 16. MAX763A 3.3V TO 11. SHDN MAX748A MAX763A 0.047 F GND REF 6 2 Figure 3. Standard 3.3V Step-Down Application Circuit Using Through-Hole Components ...

Page 10

Step-Down, Current-Mode PWM DC-DC Converters INPUT MAX748A 3.3V TO 16. MAX763A 3.3V TO 11. SHDN LX MAX748A MAX763A 5 OUT 0.047 F GND REF 1000pF ...

Page 11

Current-Mode PWM DC-DC Converters Figure 6. DIP PC Layout, Through-Hole Component Placement Diagram (1X Scale) Figure 8. DIP PC Layout, Solder Side (1X Scale) ______________________________________________________________________________________ 3.3V, Step-Down, Figure 7. DIP PC Layout, Component Side (1X Scale) Figure 9. DIP PC ...

Page 12

... N. Wide SO _Ordering Information (continued) PART TEMP. RANGE PIN-PACKAGE MAX763ACPA 0°C to +70°C 8 Plastic DIP MAX763ACSA 0°C to +70° MAX763AC/D 0°C to +70°C Dice* MAX763AEPA -40°C to +85°C 8 Plastic DIP MAX763AESA -40°C to +85° MAX763AMJA -55° ...

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