MAX738ACWE+ Maxim Integrated Products, MAX738ACWE+ Datasheet

MAX738ACWE+

Manufacturer Part Number

MAX738ACWE+

Description

IC DCDC CONV PWM STPDN 5V 16SOIC

Manufacturer

Maxim Integrated Products

Type

Step-Down (Buck)r

Datasheet

1.MAX738ACWE.pdf (16 pages)

Specifications of MAX738ACWE+

Internal Switch(s)

Yes

Synchronous Rectifier

Number Of Outputs

Voltage - Output

Current - Output

750mA

Frequency - Switching

190kHz

Voltage - Input

6 ~ 16 V

Operating Temperature

0°C ~ 70°C

Mounting Type

Surface Mount

Package / Case

16-SOIC (0.300", 7.5mm Width)

Power - Output

762mW

Output Voltage

5 V

Input Voltage

6 V to 16 V

Supply Current

1.7 mA

Switching Frequency

160 KHz

Maximum Operating Temperature

+ 70 C

Minimum Operating Temperature

0 C

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Current page: 1 of 16
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The MAX730A/MAX738A/MAX744A are 5V-output

CMOS, step-down switching regulators. The MAX738A/

MAX744A accept inputs from 6V to 16V and deliver

750mA. The MAX744A guarantees 500mA load capa-

bility for inputs above 6V and has tighter oscillator fre-

quency limits for low-noise (radio) applications. The

MAX730A accepts inputs between 5.2V and 11V and

delivers 450mA for inputs above 6V. Typical efficien-

cies are 85% to 96%. Quiescent supply current is

1.7mA and only 6µA in shutdown.

Pulse-width modulation (PWM) current-mode control

provides precise output regulation and excellent tran-

sient responses. Output voltage accuracy is guaran-

teed to be ±5% over line, load, and temperature varia-

tions. Fixed-frequency switching allows easy filtering of

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

external components. These regulators require only a

single inductor value to work in most applications, so

no inductor design is necessary.

The MAX730A/MAX738A/MAX744A also feature cycle-

by-cycle current limiting, overcurrent limiting, undervolt-

age lockout, and programmable soft-start protection.

19-0165; Rev 2; 1/96

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

__________________General Description

__________Typical Operating Circuit

___________________________Applications

6V TO 16V

ON/OFF

INPUT

68 F

Portable Instruments

Cellular Phones and Radios

Personal Communicators

Distributed Power Systems

Computer Peripherals

SHDN

REF

________________________________________________________________ Maxim Integrated Products

MAX738A

MAX744A

V+

GND

Current-Mode PWM DC-DC Converters

OUT

33 H

OUTPUT

100 F

Ordering Information continued at end of data sheet.

*Contact factory for dice specifications.

_________________Ordering Information

________________________________Features

_________________Pin Configurations

MAX730ACPA

MAX730ACSA

MAX730AC/D

MAX730AEPA

MAX730AESA

MAX730AMJA

TOP VIEW

750mA Load Currents (MAX738A/MAX744A)

High-Frequency, Current-Mode PWM

159kHz to 212.5kHz Guaranteed Oscillator

Frequency Limits (MAX744A)

85% to 96% Efficiencies

1.7mA Quiescent Current

6µA Shutdown Supply Current

Single Preselected Inductor Value,

No Component Design Required

Overcurrent, Soft-Start, and Undervoltage

Lockout Protection

Cycle-by-Cycle Current Limiting

8-Pin DIP/SO Packages (MAX730A)

Pin Configurations continued on last page.

PART

SHDN

REF

-40°C to +85°C

-55°C to +125°C

5V, Step-Down,

TEMP. RANGE

0°C to +70°C

MAX730A

MAX738A

MAX744A

DIP

8 Plastic DIP

8 SO

Dice*

8 Plastic DIP

8 SO

8 CERDIP

V+

GND

OUT

PIN-PACKAGE

Related parts for MAX738ACWE+

MAX738ACWE+ Summary of contents

Page 1

... MAX744A ON/OFF SHDN OUT REF CC SS GND ________________________________________________________________ Maxim Integrated Products For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 ________________________________Features 750mA Load Currents (MAX738A/MAX744A) High-Frequency, Current-Mode PWM 159kHz to 212.5kHz Guaranteed Oscillator Frequency Limits (MAX744A) 85% to 96% Efficiencies 1.7mA Quiescent Current 6µ ...

Page 2

Step-Down, Current-Mode PWM DC-DC Converters ABSOLUTE MAXIMUM RATINGS Pin Voltages V+ (MAX730A) ......................................................+12V, -0.3V V+ (MAX738A/MAX744A) .....................................+18V, -0.3V LX (MAX730A) .................................(V+ - 12V) to (V+ + 0.3V) LX (MAX738A/MAX744A) ................(V+ - 21V) to (V+ + 0.3V) OUT .................................................................................±25V SS, ...

Page 3

Current-Mode PWM DC-DC Converters ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure for the MAX730A 12V for the MAX738A/MAX744A, I unless otherwise noted.) PARAMETER CONDITIONS I = 0mA to 300mA LOAD Load Regulation I = 0mA ...

Page 4

Step-Down, Current-Mode PWM DC-DC Converters __________________________________________Typical Operating Characteristics (Circuit of Figure +25°C, unless otherwise noted.) A MAX730A EFFICIENCY vs. OUTPUT CURRENT 100 (NOTES 5. ...

Page 5

Current-Mode PWM DC-DC Converters ____________________________Typical Operating Characteristics (continued) (Circuit of Figure +25°C, unless otherwise noted.) A OSCILLATOR FREQUENCY vs. SUPPLY VOLTAGE 220 210 MAX730A 200 190 180 170 160 MAX738A 150 SUPPLY VOLTAGE ...

Page 6

Step-Down, Current-Mode PWM DC-DC Converters ____________________________Typical Operating Characteristics (continued) (Circuit of Figure +25°C, unless otherwise noted.) A MAX738A/MAX744A SWITCHING WAVEFORMS, CONTINUOUS CONDITION 2 s/div A: SWITCH VOLTAGE (LX PIN), 5V/div +12V B: INDUCTOR CURRENT, ...

Page 7

Current-Mode PWM DC-DC Converters ____________________________Typical Operating Characteristics (continued) (Circuit of Figure +25°C, unless otherwise noted.) A MAX730A LOAD-TRANSIENT RESPONSE 50ms/div A: V OUT , 50mV/div, DC-COUPLED B: I OUT , 200mA/div, 20mA TO 300mA ...

Page 8

Step-Down, Current-Mode PWM DC-DC Converters _________________Detailed Description The MAX730A/MAX738A/MAX744A switch-mode regu- lators use a current-mode pulse-width-modulation (PWM) control system coupled with a simple step-down (buck) regulator topography. They convert an unregu- lated DC voltage from 5.2V to 11V for ...

Page 9

Current-Mode PWM DC-DC Converters Table 1. Typical Soft-Start Times MAX730A CIRCUIT CONDITIONS R1 (kΩ) V+ (V) I OUT 510 6 510 9 510 11 510 9 150 510 9 300 510 9 150 510 9 150 None 6 None 9 ...

Page 10

Step-Down, Current-Mode PWM DC-DC Converters SHDN BIAS GEN OUT C5 ERROR AMP 330pF CC 1.23V R1 BANDGAP 510k REF C6 0. ±35 0.1 F GND *SEE TABLE 2 FOR COMPONENT VALUES AND SUPPLIERS Figure 1. ...

Page 11

Current-Mode PWM DC-DC Converters Table 2. Component Values and Suppliers MAX730AC/MAX738AC/MAX744AC Production Commercial Temp. Range Method Inductors L1 = 33µH to 100µH Sumida (708) 956-0666 CD54-101KC (MAX730AC) Surface CD105-101KC Mount (MAX738AC/MAX744AC) Coiltronics (407) 241-7876 CTX100 series L1 = 33µH to ...

Page 12

Step-Down, Current-Mode PWM DC-DC Converters FROM SHDN R1 SS CLAMP 510k SS 1M ±35% C1 1.23V MAX730A MAX738A MAX744A Figure 2. Block Diagram of Soft-Start Circuitry MAX730A +5.2V TO +11.0V MAX738A/MAX744A +6.0V TO +16. ...

Page 13

Current-Mode PWM DC-DC Converters MAX730 EVALUATION KIT Figure 4. DIP PC Layout, Through-Hole Component Placement Diagram (1x scale) Figure 6. DIP PC Layout, Solder Side (1x scale) ______________________________________________________________________________________ 5V, Step-Down, Figure 5. DIP PC Layout, Component Side (1x scale) Figure ...

Page 14

Step-Down, Current-Mode PWM DC-DC Converters ____Pin Configurations (continued) TOP VIEW SHDN 1 8 REF 2 7 MAX730A SHDN 15 REF 3 14 N.C. MAX738A 4 13 MAX744A N.C. ...

Page 15

Current-Mode PWM DC-DC Converters ________________________________________________________Package Information ______________________________________________________________________________________ 45˚ 0.127mm 0.004in 5V, Step-Down, ...

Page 16

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 16 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1996 Maxim Integrated Products ...

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