MAX748A, MAX763A

3.3V, Step-Down, Current-Mode PWM DC-DC Converters

We Recommend Improved Performance Devices, MAX887 for MAX763A, MAX1684/MAX1685 for MAX748A, for New Designs
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Status Explanations for product status codes

Active: In Production.

Description

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 provides 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 applications, so no magnetics design is necessary.

The MAX748A/MAX763A also feature cycle-by-cycle current 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.
 

Data Sheet

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Key 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)
  • 0.2µA 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)
 

Applications/Uses

  • 5V to 3.3V Conversion
  • Cell Phones
  • Computer Peripherals
  • Handheld Computers
  • Portable Instrumentation
   

Key Specifications:

Step-Down Switching Regulators
Part Number VIN
(V)		 VIN
(V)		 VOUT
(V)		 VOUT
(V)		 Preset VOUT
(V)		 Max. IOUT
(A)		 Output Adjust. Method DC-DC Outputs Oper. Freq.
(kHz)		 Package/Pins Smallest Available Pckg.
(mm2)		 Budgetary Price
min max min max ≤ max w/pins See Notes
MAX748A  3.3 16 3.3 3.3 3.3 0.5
Preset
Resistor
 1 212.5
CDIP(N)/8
PDIP(N)/8
SOIC(W)/16
 81.9 $2.75 @1k
MAX763A  11
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
 30.9 $2.39 @1k
See All Step-Down Switching Regulators (288)
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

MAX748A, MAX763A: Typical Operating Circuit
Typical Operating Circuit

Reliability Reports

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Software/Models

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Ordering Information

Filters: Part Number: Package: Temperature: Tape and Reel Sample
Part Number Free
Sample		 Buy Status Explanations for product status codes Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR * 		Temp RoHS/Lead-Free?
Materials Analysis
MAX748AC/D    
Active DICE SALES;NA pin;DICE;

Land Pattern: Not Applicable
Use pkgcode/variation: DICE*
See data sheet
MAX748ACPA    
Active PDIP(N);8 pin;81.9 mm²
Outline Drawing:21-0043 (PDF)
Land Pattern: Not Applicable
Use pkgcode/variation: P8-3*
0°C to +70°C RoHS/Lead-Free: No
Materials Analysis
MAX748ACPA+  
Active PDIP(N);8 pin;81.9 mm²
Outline Drawing:21-0043 (PDF)
Land Pattern: Not Applicable
Use pkgcode/variation: P8+3*
0°C to +70°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX748ACWE    
Active SOIC(W);16 pin;110.6 mm²
Outline Drawing:21-0042 (PDF)
Land Pattern: 90-0107 (PDF)
Use pkgcode/variation: W16-2*
0°C to +70°C RoHS/Lead-Free: No
Materials Analysis
MAX748ACWE+  
Active SOIC(W);16 pin;110.6 mm²
Outline Drawing:21-0042 (PDF)
Land Pattern: 90-0107 (PDF)
Use pkgcode/variation: W16+2*
0°C to +70°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX748ACWE+T    
Active W.SO;16 pin

Land Pattern: Not Available

0°C to +70°C See data sheet
MAX748ACWE-T    
Active W.SO;16 pin

Land Pattern: Not Available

0°C to +70°C See data sheet
MAX748AEPA    
Active PDIP(N);8 pin;81.9 mm²
Outline Drawing:21-0043 (PDF)
Land Pattern: Not Applicable
Use pkgcode/variation: P8-3*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis
MAX748AEPA+  
Active PDIP(N);8 pin;81.9 mm²
Outline Drawing:21-0043 (PDF)
Land Pattern: Not Applicable
Use pkgcode/variation: P8+3*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX748AEWE    
Active SOIC(W);16 pin;110.6 mm²
Outline Drawing:21-0042 (PDF)
Land Pattern: 90-0107 (PDF)
Use pkgcode/variation: W16-2*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis
Part Number Free
Sample		 Buy Status Explanations for product status codes Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR * 		Temp RoHS/Lead-Free?
Materials Analysis
MAX748AEWE+  
Active SOIC(W);16 pin;110.6 mm²
Outline Drawing:21-0042 (PDF)
Land Pattern: 90-0107 (PDF)
Use pkgcode/variation: W16+2*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX748AEWE+T    
Active SOIC(W);16 pin;110.6 mm²
Outline Drawing:21-0042 (PDF)
Land Pattern: 90-0107 (PDF)
Use pkgcode/variation: W16+2*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX748AEWE-T    
Active SOIC(W);16 pin;110.6 mm²
Outline Drawing:21-0042 (PDF)
Land Pattern: 90-0107 (PDF)
Use pkgcode/variation: W16-2*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis
MAX748AMJA    
Active CDIP(N);8 pin;82.6 mm²
Outline Drawing:21-0045 (PDF)
Land Pattern: Not Applicable
Use pkgcode/variation: J8-2*
-55°C to +125°C RoHS/Lead-Free: No
Materials Analysis
MAX763AC/D    
Active DICE SALES;NA pin;DICE;

Land Pattern: Not Applicable
Use pkgcode/variation: DICE*
See data sheet
MAX763ACPA    
Active PDIP(N);8 pin;79.7 mm²
Outline Drawing:21-0043 (PDF)
Land Pattern: Not Applicable
Use pkgcode/variation: P8-2*
0°C to +70°C RoHS/Lead-Free: No
Materials Analysis
MAX763ACSA    
Active SOIC(N);8 pin;30.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8-4*
0°C to +70°C RoHS/Lead-Free: No
Materials Analysis
MAX763ACSA+  
Active SOIC(N);8 pin;30.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8+4*
0°C to +70°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX763ACSA+T    
Active SOIC(N);8 pin;30.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8+4*
0°C to +70°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX763ACSA-T    
Active SOIC(N);8 pin;30.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8-4*
0°C to +70°C RoHS/Lead-Free: No
Materials Analysis
Part Number Free
Sample		 Buy Status Explanations for product status codes Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR * 		Temp RoHS/Lead-Free?
Materials Analysis
MAX763AEPA    
Active PDIP(N);8 pin;79.7 mm²
Outline Drawing:21-0043 (PDF)
Land Pattern: Not Applicable
Use pkgcode/variation: P8-2*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis
MAX763AESA    
Active SOIC(N);8 pin;30.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8-4*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis
MAX763AESA+  
Active SOIC(N);8 pin;30.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8+4*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX763AESA+T    
Active N.SO;8 pin

Land Pattern: Not Available

-40°C to +85°C See data sheet
MAX763AESA-T    
Active N.SO;8 pin

Land Pattern: Not Available

-40°C to +85°C See data sheet
MAX763AMJA    
Active CDIP(N);8 pin;82.6 mm²
Outline Drawing:21-0045 (PDF)
Land Pattern: Not Applicable
Use pkgcode/variation: J8-2*
-55°C to +125°C RoHS/Lead-Free: No
Materials Analysis

Notes:
  1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
  2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
  3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
  4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

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Document Ref.: 19-0190 Rev 0; 1993-09-01
This page last modified: 2007-05-30

 


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