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MAX742

Switch-Mode Regulator with 5V to ±12 or ±15V Dual-Output

Overview

Technical Documents

Ordering Info

Status

Part Number	Status	Explanation
MAX742	This product is No Longer Available. See Ordering Information for recommended replacements.	See application note 3943 for a complete replacement solution using the MAX668 and MAX1846.

Description

The MAX742 DC-DC converter is a controller for dual-output power supplies in the 3W to 60W range. Relying on simple two-terminal inductors rather than transformers, the MAX742 regulates both outputs independently to within ±4% over all conditions of line voltage, temperature, and load current.

The MAX742 has high efficiency (up to 92%) over a wide range of output loading. Two independent PWM current-mode feedback loops provide tight regulation and operation free from subharmonic noise. The MAX742 can operate at 100kHz or 200kHz, so it can be used with small and lightweight external components. Also ripple and noise are easy to filter. The MAX742 provides a regulated output for inputs ranging from 4.2V to 10V (and higher with additional components).

External power MOSFETs driven directly from the MAX742 are protected by cycle-by-cycle overcurrent sensing. The MAX742 also features undervoltage lockout, thermal shutdown, and programmable soft-start.

If 3W of load power or less is needed, refer to the MAX743 data sheet for a device with internal power MOSFETs.

Data Sheet

Download	Rev 2	(PDF, 152kB)
E-Mail

Key Features

Specs Guaranteed for In-Circuit Performance
Load Currents to ±2A
4.2V to 10V Input-Voltage Range
Switches From ±15V to ±12V Under Logic Control
±4% Output Tolerance Max Over Temp, Line, and Load
90% Typ Efficiency
Low-Noise, Current-Mode Feedback
Cycle-by-Cycle Current Limiting
Undervoltage Lockout and Soft-Start
100kHz or 200kHz Operation

Applications/Uses

Computer Peripherals
DC-DC Converter Module Replacement
Distributed Power Systems

Key Specifications:

Inverting Switching Regulators

Part Number

V_IN
(V)

V_OUT
(V)

Preset V_OUT
(V)

Max. I_OUT
(A)

Output Adjust. Method

DC-DC Outputs

Alternate Topology

Oper. Freq.
(kHz)

Package/Pins

Smallest Available Pckg.
(mm²)

min

max

min

max

≥

≤

max w/pins

MAX742

4.2

-15

-12

Preset

Inverting

Step-Up

200

CDIP(N)/20

PDIP(N)/20

SOIC(W)/20

137.3

See All Inverting Switching Regulators (25)

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.

Step-Up Switching Regulators

Part Number

V_IN
(V)

V_OUT
(V)

Preset V_OUT
(V)

Max. I_OUT
(A)

Output Adjust. Method

DC-DC Outputs

Oper. Freq.
(kHz)

Package/Pins

Smallest Available Pckg.
(mm²)

min

max

min

max

≥

≤

max w/pins

MAX742

4.2

-15

-12

Preset

200

CDIP(N)/20

PDIP(N)/20

SOIC(W)/20

137.3

See All Step-Up Switching Regulators (95)

Diagram

Simplified Block Diagram

Product Guides

Wireless (PDF)

Reliability Reports

Show FIT data for:
Request Reliability Report for:

Software/Models

none

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Notes	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX742C/D	See app note 3943 for complete solution		N/A	No Longer Available	MAX668 MAX1846	DICE SALES;NA pin;DICE; Land Pattern: Not Applicable Use pkgcode/variation: DICE*		See data sheet
MAX742CPP	See app note 3943 for complete solution		N/A	No Longer Available	MAX668 MAX1846	PDIP(N);20 pin;217.1 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P20-3*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX742CWP	See app note 3943 for complete solution		N/A	No Longer Available	MAX668 MAX1846	SOIC(W);20 pin;137.3 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0108 (PDF) Use pkgcode/variation: W20-3*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX742CWP+	See app note 3943 for complete solution		N/A	No Longer Available	MAX668 MAX1846	SOIC(W);20 pin;137.3 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0108 (PDF) Use pkgcode/variation: W20+3*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX742CWP+T	See app note 3943 for complete solution		N/A	No Longer Available	MAX668 MAX1846	SOIC(W);20 pin;137.3 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0108 (PDF) Use pkgcode/variation: W20+3*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX742CWP-T	See app note 3943 for complete solution		N/A	No Longer Available	MAX668 MAX1846	SOIC(W);20 pin;137.3 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0108 (PDF) Use pkgcode/variation: W20-3*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX742EPP	See app note 3943 for complete solution		N/A	No Longer Available	MAX668 MAX1846	PDIP(N);20 pin;217.1 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P20-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX742EPP+	See app note 3943 for complete solution		N/A	No Longer Available	MAX668 MAX1846	PDIP(N);20 pin;217.1 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P20+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX742EWP	See app note 3943 for complete solution		N/A	No Longer Available	MAX668 MAX1846	SOIC(W);20 pin;137.3 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0108 (PDF) Use pkgcode/variation: W20-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX742EWP+	See app note 3943 for complete solution		N/A	No Longer Available	MAX668 MAX1846	SOIC(W);20 pin;137.3 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0108 (PDF) Use pkgcode/variation: W20+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
Part Number	Notes	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX742EWP+T	See app note 3943 for complete solution		N/A	No Longer Available	MAX668 MAX1846	SOIC(W);20 pin;137.3 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0108 (PDF) Use pkgcode/variation: W20+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX742EWP-T	See app note 3943 for complete solution		N/A	No Longer Available	MAX668 MAX1846	W.SO;20 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX742EWP/GH9	See app note 3943 for complete solution		N/A	No Longer Available		SOIC(W);20 pin;137.3 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0108 (PDF) Use pkgcode/variation: W20-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX742EWP/GH9-T			N/A	No Longer Available		W.SO; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX742MJP	See app note 3943 for complete solution		N/A	No Longer Available	MAX668 MAX1846	CDIP(N);20 pin;218.9 mm² Outline Drawing:21-0045 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: J20-2*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
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.
* 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.

Notes and Comments

Delivers load currents up to ±2A
Switches from ±15V to ±12V under logic controls
Drives external MOSFETs
Subharmonic noise eliminated

Similar Products by Function

MAX743	Dual-Output, PWM Switch-Mode Regulator (5V to ±15V or ±12V)
See All Inverting Switching Regulators (25 Products) See All Step-Up Switching Regulators (104 Products)

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 19-3105 Rev 2; 1996-08-01
This page last modified: 2009-08-17