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MAX742
Switch-Mode Regulator with 5V to ±12 or ±15V Dual-Output
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Status
| Part Number |
Status |
Explanation |
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MAX742
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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.
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Data Sheet
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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
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Applications/Uses
- Computer Peripherals
- DC-DC Converter Module Replacement
- Distributed Power Systems
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Key Specifications:
| Inverting Switching Regulators |
| Part Number |
VIN
(V) |
VIN
(V) |
VOUT
(V) |
VOUT
(V) |
Preset VOUT
(V) |
Max. IOUT
(A) |
Max. IOUT
(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 |
10 |
12 |
15 |
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1 |
1 |
Preset |
2 |
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200 |
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137.3 |
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See All Inverting Switching Regulators (25)
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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.
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| Step-Up Switching Regulators |
| Part Number |
VIN
(V) |
VIN
(V) |
VOUT
(V) |
VOUT
(V) |
Preset VOUT
(V) |
Max. IOUT
(A) |
Max. IOUT
(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 |
10 |
12 |
15 |
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1 |
1 |
Preset |
2 |
200 |
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137.3 |
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See All Step-Up Switching Regulators (95)
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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.
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Diagram
Simplified Block Diagram
Notes and Comments
Delivers load currents up to ±2A
Switches from ±15V to ±12V under logic controls
Drives external MOSFETs
Subharmonic noise eliminated
Didn't Find What You Need?
Information Index
Document Ref.: 19-3105
Rev 2;
1996-08-01
This page last modified: 2009-08-17
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