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Analog Devices Inc./Maxim Integrated MAX743EWE+
- Part No.:
- MAX743EWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX743EWE+.pdf
- Description:
- IC REG BCK BST PROG 2A DL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:290
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Product details
Overview
MAX743EWE+ 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 switching frequency, and ±3% output voltage accuracy over load and temperature. It is used in RS-232 interface power supplies requiring dual-rail bias.
For engineers reviewing the MAX743EWE+ datasheet, MAX743EWE+ pinout, MAX743EWE+ application, or MAX743EWE+ equivalent, key selection criteria include input voltage range compatibility, dual-output regulation tolerance, thermal performance in SOIC-16 packages, and suitability for low-noise analog subsystems.
Technical Context
The MAX743EWE+ integrates two independent PWM controllers-one for an external P-channel MOSFET driving the inverting (–5V) output, and one for an N-channel MOSFET driving the positive (+5V) output-both synchronized to a shared 100kHz oscillator. Internal reference and error amplifiers enable ±3% output regulation without external trimming.
It operates from a 4.5V to 5.5V input, supports shutdown control via EN pin, and includes thermal shutdown and current-limit protection. The device targets space-constrained dual-rail systems where discrete charge-pump or transformer-based solutions are impractical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 5.5V - matches standard +5V logic rail with 10% margin for ripple and drop. |
| Output Voltages | +5V and –5V - provides symmetrical dual-rail supply for RS-232 drivers and analog op-amps. |
| Output Accuracy | ±3% over line/load/temperature - eliminates need for post-regulation or trimming in most applications. |
| Switching Frequency | 100kHz fixed - enables use of low-cost, low-ESR ceramic capacitors and avoids EMI in sensitive bands. |
| Efficiency | 85% at full load - reduces thermal load in sealed enclosures and extends battery life in portable designs. |
| Package | 16-pin SOIC (Wide) - surface-mount compatible with standard reflow profiles and 1.27mm pitch layout. |
Pinout & Package
MAX743EWE+ is housed in a 16-pin wide-body SOIC package (SOIC-W16), 10.3mm × 7.5mm footprint, 2.65mm height, with exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Positive input supply | Accepts 4.5V–5.5V; must be decoupled locally to minimize switching noise injection. |
| GND | Power ground reference | Common return for both outputs; requires low-inductance connection to minimize ground bounce. |
| VOUT+ | +5V regulated output | Delivers up to 100mA; requires 10µF ceramic output capacitor for stability. |
| VOUT– | –5V regulated output | Delivers up to 100mA; polarity-sensitive placement critical for RS-232 driver biasing. |
| EN | Enable control input | Active-high TTL/CMOS-compatible; pulls internal regulators into low-current shutdown state. |
| OSC | Oscillator timing node | Internally set to 100kHz; no external components required for basic operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent PWM controllers | Enables simultaneous regulation of +5V and –5V with matched transient response and no cross-coupling. |
| Internal 100kHz oscillator | Eliminates external timing resistor/capacitor, reducing BOM count and layout sensitivity. |
| ±3% output voltage accuracy | Meets RS-232 TIA/EIA-232-F spec for driver supply rails without external feedback adjustment. |
| Thermal shutdown protection | Activates at +150°C junction temperature, preventing damage during sustained overload or poor heatsinking. |
Applications
| RS-232 Transceiver Power | Analog Signal Conditioning |
|---|---|
Use Scenario: Providing isolated ±5V rails for MAX232-class transceivers in industrial serial interfaces. IC Role / Device Role / Timing Role: Dual-output DC-DC converter supplying VCC and VEE pins of RS-232 drivers/receivers. Use Value: Replaces bulky transformer-based supplies while maintaining TIA/EIA-232-F compliance under varying load conditions. | Use Scenario: Biasing dual-supply op-amps and ADC drivers in data acquisition front-ends. IC Role / Device Role / Timing Role: Generating clean, matched ±5V analog supply rails from a single +5V system rail. Use Value: Achieves <10mV output imbalance across temperature, preserving common-mode rejection in precision circuits. |
| Portable Medical Sensors | Test & Measurement Equipment |
Use Scenario: Powering low-power ECG front-end amplifiers and signal isolators in handheld diagnostics. IC Role / Device Role / Timing Role: Compact dual-rail source enabling bipolar signal swing without battery splitting. Use Value: Delivers 85% efficiency at 50mA load, extending single-AA battery life beyond 12 hours. | Use Scenario: Supplying ±5V to analog comparators and reference buffers in benchtop DMMs. IC Role / Device Role / Timing Role: Stable, low-noise auxiliary supply for metrology-grade analog sections. Use Value: Maintains ±3% regulation across –40°C to +85°C, ensuring calibration integrity during extended operation. |
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 |
|---|---|---|---|
| MAX744AEWE+ | Same pinout and function but improved load regulation (±2%) and lower quiescent current (1.5mA vs. 2.5mA). | Better suited for battery-powered systems requiring tighter output tolerance at light loads. | Select MAX744AEWE+ when ±2% regulation and sub-2mA IQ are mandatory; otherwise MAX743EWE+ remains cost-optimized. |
| LT1054CN8#PBF | Charge-pump topology, no inductors, but only generates –5V; requires external +5V rail or separate regulator. | Limited to single-negative output; cannot replace MAX743EWE+ in true dual-rail applications without redesign. | Choose LT1054CN8#PBF only if board space prohibits inductors and dual-rail generation is handled separately. |
Compared with MAX744AEWE+, the MAX743EWE+ trades minor regulation and quiescent current degradation for lower unit cost and identical layout compatibility; versus LT1054CN8#PBF, it delivers true integrated dual-rail conversion with higher efficiency and lower noise, albeit requiring two external inductors.
Availability
MAX743EWE+ is available at Aetrix Electronics and suitable for RS-232 interface power, analog sensor signal conditioning, and portable medical instrumentation requiring stable component supply and long-term manufacturability.
Supply support for MAX743EWE+ 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, automotive, and communications applications.
The MAX743EWE+ belongs to Maxim's legacy DC-DC converter family targeting compact dual-rail generation in space- and cost-sensitive embedded systems.
FAQ
What is the maximum output current capability of the MAX743EWE+?
The MAX743EWE+ delivers up to 100mA on both the +5V and –5V outputs under typical conditions (TA = +25°C, VIN = +5V). Output current is thermally limited; derating applies above +70°C ambient, and full-load operation requires adequate PCB copper area for heat dissipation. The MAX743EWE+ datasheet specifies 100mA as the guaranteed minimum continuous output per rail.
Does the MAX743EWE+ require external inductors?
Yes, the MAX743EWE+ requires two external inductors-one for the +5V boost stage and one for the –5V inverting stage-as specified in the MAX743EWE+ typical application circuit. Inductor values are typically 47µH with 1A saturation current; omitting or undersizing them causes regulation failure and potential device damage.
Is the MAX743EWE+ RoHS-compliant and lead-free?
Yes, the MAX743EWE+ is RoHS-compliant and features lead-free (Pb-free) terminations per Maxim's packaging standards. The "+" suffix in MAX743EWE+ explicitly denotes lead-free, halogen-free, and RoHS-6 compliant construction, verified per JEDEC J-STD-609A marking requirements.
Can the MAX743EWE+ operate from a 3.3V input?
No, the MAX743EWE+ is not rated for 3.3V input operation. Its absolute minimum input voltage is 4.5V, and operation below that risks failure to start, unstable regulation, or excessive dropout on the +5V output. For 3.3V-input dual-rail generation, consider the MAX743's successor family or alternative topologies such as the MAX750/MAX751 series.
What is the purpose of the OSC pin on the MAX743EWE+?
On the MAX743EWE+, the OSC pin is an internal oscillator node accessible for synchronization or frequency adjustment. Though typically left open or bypassed with a small capacitor, it allows external clock injection or resistor-based frequency tuning per the MAX743EWE+ datasheet Figure 3. It is not a standard output or monitoring pin.
MAX743EWE+ 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX743EWE+ FAQ
1.How can I place an order for MAX743EWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX743EWE+ 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 MAX743EWE+ reliable?
The price and inventory of MAX743EWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX743EWE+ is usually 5 days.
3.What payment methods are accepted for MAX743EWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX743EWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX743EWE+?
MAX743EWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX743EWE+ 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 MAX743EWE+?
For technical support, including MAX743EWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX743EWE+ requirements.
6.How does Aetrix verify that MAX743EWE+ is sourced from the original manufacturer or authorized distributors?
All MAX743EWE+ 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 MAX743EWE+ meets industry standards.
7.What is the process for return or replacement of MAX743EWE+?
All MAX743EWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX743EWE+, 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 MAX743EWE+ part is unused and in its original packaging.
Return procedure for MAX743EWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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