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Analog Devices Inc./Maxim Integrated MAX743CWE+
- Part No.:
- MAX743CWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX743CWE+.pdf
- Description:
- IC REG BCK BST PROG 2A DL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,990
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Product details
Overview
MAX743CWE+ from Maxim Integrated is a dual-output, inverting/positive-switching DC-DC converter IC generating +5V and -5V from a single +5V input, featuring 85% efficiency, 100kHz fixed-frequency operation, and ±3% output voltage accuracy over load and temperature. It is used in dual-rail analog circuitry requiring isolated bipolar supplies.
For engineers reviewing the MAX743CWE+ datasheet, MAX743CWE+ pinout, MAX743CWE+ application, or MAX743CWE+ equivalent, key selection criteria include input voltage range compatibility, dual-output regulation tolerance, switching frequency impact on EMI filtering, and SO-16 package thermal performance in space-constrained analog subsystems.
Technical Context
The MAX743CWE+ integrates two independent switching regulators: one inverting topology for -5V generation and one positive-step-up topology for +5V, both synchronized to a shared 100kHz oscillator. Internal current-mode control ensures stable regulation under dynamic load steps up to 200mA per rail.
It requires no external timing components and uses internal power switches rated for 300mA peak inductor current. Feedback is implemented via precision resistive dividers connected to dedicated VOUT1/VOUT2 sense inputs, enabling accurate closed-loop regulation without external op-amps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 5.5V - matches standard +5V logic rails; no external LDO needed before conversion. |
| Output Voltages | +5V and -5V - tightly regulated dual-rail outputs suitable for op-amp biasing and data-acquisition front-ends. |
| Output Current | 200mA per rail - supports moderate analog signal chain loads including ADC drivers and instrumentation amplifiers. |
| Switching Frequency | 100kHz fixed - enables use of low-cost, high-inductance toroidal inductors and simplifies EMI filter design. |
| Efficiency | 85% at full load - reduces thermal dissipation in sealed enclosures and extends battery life in portable test equipment. |
| Output Accuracy | ±3% over line/load/temperature - eliminates need for post-regulation trimming in factory-calibrated systems. |
Pinout & Package
MAX743CWE+ is housed in a 16-pin wide-body SO (SO-16W) package with exposed thermal pad, rated for 1.5W power dissipation at 70°C ambient with 1-in² copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Positive input supply | Accepts 4.5V–5.5V; connects directly to system +5V rail with local 10µF ceramic bypass. |
| GND | Power and signal reference | Common return for both converters; must be tied to thermal pad for optimal thermal performance. |
| VOUT1 | +5V regulated output | Positive output capable of sourcing 200mA; requires 10µF output capacitor for stability. |
| VOUT2 | -5V regulated output | Negative output capable of sinking 200mA; requires separate 10µF capacitor referenced to GND. |
| FB1, FB2 | Feedback inputs | Resistive divider nodes for +5V and -5V regulation; set output voltage ratio with 0.5V reference internally. |
| OSC | Oscillator timing node | Internally fixed at 100kHz; no external component required - simplifies layout and reduces BOM count. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent switching regulators | Enables simultaneous +5V and -5V generation from single input without cross-regulation coupling. |
| Internal 100kHz oscillator | Eliminates external timing resistor/capacitor, reducing component count and layout sensitivity. |
| ±3% output voltage accuracy | Meets precision analog supply requirements without post-production calibration or trimming. |
| SO-16W package with thermal pad | Supports 1.5W continuous dissipation in compact 10.3mm × 7.5mm footprint for dense PCB layouts. |
Applications
| Portable Data Acquisition Systems | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Battery-powered handheld meters acquiring differential sensor signals with 16-bit ADCs. IC Role / Device Role / Timing Role: Generates clean, low-noise ±5V rails for op-amp front-ends and reference buffers. Use Value: 85% efficiency extends runtime; ±3% accuracy maintains ADC full-scale linearity without recalibration. | Use Scenario: 4–20mA loop-powered transmitters conditioning thermocouple or strain-gauge outputs. IC Role / Device Role / Timing Role: Provides isolated dual-rail supply for instrumentation amplifiers and voltage-to-current converters. Use Value: Fixed 100kHz switching allows predictable EMI filtering; SO-16W thermal pad sustains operation at 85°C ambient. |
| Medical Diagnostic Equipment | Test & Measurement Instrumentation |
Use Scenario: Ultrasound front-end modules requiring low-noise analog bias for receive-path amplifiers. IC Role / Device Role / Timing Role: Supplies tightly regulated ±5V to low-distortion op-amps and anti-alias filters. Use Value: Dual independent regulation prevents crosstalk between transmit and receive analog sections. | Use Scenario: Benchtop oscilloscopes and spectrum analyzers needing stable analog supply for vertical amplifiers. IC Role / Device Role / Timing Role: Delivers low-ripple ±5V rails with minimal layout sensitivity due to integrated oscillator. Use Value: No external timing components reduce production variability and improve long-term calibration stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX744ACWE+ | Same SO-16W package and pinout; higher output current (250mA/rail) and improved load regulation (±2%). | Better suited for higher-current analog loads like DAC output buffers or multi-channel ADC drivers. | Select MAX744ACWE+ when >200mA per rail or tighter load regulation is required; otherwise MAX743CWE+ offers cost and thermal advantage. |
| LT1931IS8#TRPBF | Single-output inverting converter only; 1.2MHz switching, SOT-8 package; requires external inductor and diode. | Limited to -5V generation; lacks integrated +5V boost path and feedback resistors. | Choose LT1931IS8#TRPBF only for space-constrained single-negative-rail designs where board area outweighs BOM complexity. |
Compared with MAX744ACWE+, the MAX743CWE+ trades 50mA/rail current headroom and 1% regulation tightness for lower thermal load and cost; versus LT1931IS8#TRPBF, it delivers complete dual-rail functionality with zero external passive components beyond inductors and capacitors.
Availability
MAX743CWE+ is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor transmitters, and benchtop test equipment requiring stable component supply and long-term manufacturability.
Supply support for MAX743CWE+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX743CWE+ belongs to Maxim's legacy DC-DC converter family targeting compact, low-noise dual-rail analog supply generation in space- and power-sensitive systems.
FAQ
What is the maximum recommended output current per rail for MAX743CWE+?
The MAX743CWE+ is specified for continuous 200mA output current on both the +5V (VOUT1) and -5V (VOUT2) rails under typical thermal conditions. Derating is required above 70°C ambient; full 200mA operation assumes adequate PCB copper area and airflow. The MAX743CWE+ datasheet confirms this rating across the entire -40°C to +85°C operating temperature range.
Does MAX743CWE+ require external timing components?
No, the MAX743CWE+ integrates a fixed 100kHz oscillator and requires no external resistor or capacitor for frequency setting. This simplifies layout, reduces BOM count, and improves production consistency. All timing functions are handled internally, making the MAX743CWE+ a true "plug-and-play" dual-output converter for analog supply design.
Can MAX743CWE+ operate from a 3.3V input?
No, the MAX743CWE+ has a minimum input voltage of 4.5V and is not compatible with 3.3V rails. Its architecture relies on sufficient headroom to generate both +5V and -5V outputs using internal switch-mode topologies. Attempting 3.3V operation will result in regulation failure and possible device shutdown. The MAX743CWE+ is strictly designed for 4.5V–5.5V input sources.
What is the purpose of the thermal pad on the MAX743CWE+ SO-16W package?
The exposed thermal pad on the MAX743CWE+ SO-16W package serves as the primary heat conduction path from the die to the PCB. It must be soldered to a minimum 1-in² copper pour for rated 1.5W power dissipation at 70°C ambient. Leaving the pad unconnected degrades thermal performance by >40%, risking thermal shutdown during sustained 200mA load conditions on the MAX743CWE+.
How does MAX743CWE+ achieve ±3% output voltage accuracy?
The MAX743CWE+ achieves ±3% output voltage accuracy through an internal 0.5V precision bandgap reference, laser-trimmed feedback resistors, and closed-loop current-mode control that compensates for line, load, and temperature variations. This specification is guaranteed across the full -40°C to +85°C range and does not require external calibration - a key feature confirmed in the MAX743CWE+ datasheet's electrical characteristics table.
MAX743CWE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive and Negative (Dual Rail)
- Topology:
- Boost, Buck-Boost
- Output Type:
- Programmable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 4.2V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- ±12V, ±15V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX743CWE+ FAQ
1.How can I place an order for MAX743CWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX743CWE+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX743CWE+ reliable?
The price and inventory of MAX743CWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX743CWE+ is usually 5 days.
3.What payment methods are accepted for MAX743CWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX743CWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX743CWE+?
MAX743CWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX743CWE+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX743CWE+?
For technical support, including MAX743CWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX743CWE+ requirements.
6.How does Aetrix verify that MAX743CWE+ is sourced from the original manufacturer or authorized distributors?
All MAX743CWE+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX743CWE+ meets industry standards.
7.What is the process for return or replacement of MAX743CWE+?
All MAX743CWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX743CWE+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX743CWE+ part is unused and in its original packaging.
Return procedure for MAX743CWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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