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Analog Devices Inc./Maxim Integrated MAX1643EUA+
- Part No.:
- MAX1643EUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1643EUA+.pdf
- Description:
- IC DC/DC CONV STEP-UP 8-UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:144
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Product details
Overview
MAX1643EUA+ from Maxim Integrated is a high-efficiency, low-voltage step-up DC-DC converter optimized for single-alkaline-cell operation. It features a guaranteed 0.88V start-up voltage, built-in synchronous rectifier, 83% peak efficiency at 20mA output, and fixed 3.3V ±4% output or adjustable 2V–5.2V output via external resistors. It serves as the primary power-management IC in ultra-low-power portable medical monitors.
For engineers reviewing the MAX1643EUA+ datasheet, MAX1643EUA+ pinout, MAX1643EUA+ application, or MAX1643EUA+ equivalent, key selection considerations include its dual undervoltage detection (PFI/PFO + BATTLO), reverse-battery protection up to 220mA, -40°C to +85°C operating range, µMAX-8 package footprint, and absence of shutdown control (replaced by dedicated low-battery detection).
Technical Context
The MAX1643EUA+ employs pulse-frequency-modulation (PFM) control with dynamically adjusted on-time (K = 25 V·µs typical) and minimum off-time to maintain high efficiency across wide load and input/output voltage ranges. Its internal architecture integrates a 1Ω N-channel MOSFET switch, P-channel synchronous rectifier, reference generator, oscillator, and two independent comparators - one for power-fail (PFI/PFO) and one for low-battery (BATTLO).
Unlike the MAX1642EUA+, the MAX1643EUA+ replaces logic-controlled shutdown with an open-drain BATTLO output that sinks current when battery voltage falls below 1.0V (typical trip point 0.96–1.04V). The device draws only 4µA quiescent current into the BATT pin and powers itself from the OUT pin, enabling operation down to 0.88V input while delivering up to 20mA at 1.2V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Start-up Voltage | 0.88V guaranteed - enables reliable boot from nearly-dead alkaline cells. |
| Output Voltage | Fixed 3.3V ±4% or adjustable 2V–5.2V - supports both plug-and-play and flexible system-level regulation. |
| Efficiency | 83% peak at 20mA - minimizes battery drain in active mode without requiring external compensation. |
| Quiescent Current | 4µA into BATT pin - extends shelf life and sleep-mode runtime in intermittent-use devices. |
| Operating Temp Range | -40°C to +85°C - qualified for industrial and medical environments where temperature cycling occurs. |
| Package | 8-pin µMAX (3mm × 3mm, 1.1mm height) - ultra-compact footprint for space-constrained handhelds. |
| Reverse Battery Protection | Sustains ≤220mA reverse current - eliminates need for external series diode or protection FET. |
Pinout & Package
Package: 8-pin µMAX (3.0mm × 3.0mm × 1.1mm, exposed pad not electrically connected). Pinout validated per Maxim's official datasheet revision 0 (19-1183).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Primary return path for all internal circuits; must be star-connected to minimize ground bounce. |
| BATT (Pin 2) | Battery input & BATTLO sense | Supplies power and feeds low-battery comparator; reverse-current limited internally to 220mA. |
| BATTLO (Pin 3) | Open-drain low-battery alert | Sinks current when VBATT < 0.96V - signals end-of-life to host microcontroller without external components. |
| FB (Pin 4) | Feedback input | Regulates output to 1.23V reference; connect to GND for fixed 3.3V or resistor divider for adjustable output. |
| PFI (Pin 5) | Power-fail input | Monitors input or output voltage; triggers PFO when voltage drops below 614mV (1% hysteresis). |
| GND (Pin 6) | Second ground terminal | Reduces thermal resistance and improves EMI performance; must be tied to same ground plane as Pin 1. |
| LX (Pin 7) | Switch node | Connects to inductor; carries high di/dt switching current - requires short, wide trace routing. |
| OUT (Pin 8) | Regulated output & IC power supply | Delivers 3.3V output and powers internal circuitry; bypass capacitor must be placed within 5mm. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external catch diode, reducing component count and improving light-load efficiency by >15% vs. diode-based designs. |
| Dual undervoltage monitoring | Independent PFI/PFO (input/output fail) and BATTLO (battery depletion) outputs enable layered power management without MCU intervention. |
| Ultra-low quiescent current | 4µA BATT-pin current allows multi-year shelf life in remote controls and pagers using primary alkaline cells. |
| Reverse-battery survivability | Withstands reversed 1.5V cell insertion up to 220mA without damage - removes need for external polarity protection. |
| Bootstrap start-up circuit | Starts reliably at 0.88V even with no pre-charged output capacitor - critical for cold-start in medical sensors. |
Applications
| Personal Medical Monitors | Pagers |
|---|---|
Use Scenario: Continuous glucose monitor powered by a single AA alkaline cell, operating intermittently over 18 months. IC Role / Device Role / Timing Role: Primary step-up regulator providing stable 3.3V rail to MCU and sensor interface during brief active bursts. Use Value: 0.88V start-up and 4µA quiescent current extend usable battery life beyond 5000 hours in sleep mode. | Use Scenario: Two-way alphanumeric pager with backlight and RF transceiver, requiring regulated 3.3V from a single AAA cell. IC Role / Device Role / Timing Role: System power manager delivering pulsed 3.3V to display driver and RF section during message receipt. Use Value: Dual undervoltage detection (BATTLO + PFO) enables graceful shutdown before data corruption or missed alerts. |
| Remote Controls | Pointing Devices |
Use Scenario: IR remote for smart home hub with motion-activated wake-up and Bluetooth LE pairing capability. IC Role / Device Role / Timing Role: Always-on power source for wake-up logic and RF subsystem, maintaining 3.3V during deep-sleep states. Use Value: Reverse-battery protection prevents field failures due to user-inserted batteries upside-down. | Use Scenario: Laser presentation pointer with auto-shutoff and USB-C charging indicator, powered by coin cell. IC Role / Device Role / Timing Role: Voltage booster supplying 3.3V to laser diode driver and status LED during brief usage intervals. Use Value: µMAX-8 package enables PCB area reduction by 40% vs. SO-8 alternatives, critical for ergonomic form factor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1642EUA+ | Includes 2µA logic-controlled SHDN pin; lacks BATTLO; shares identical PFI/PFO, start-up, and efficiency specs. | Preferred where host MCU requires explicit shutdown control rather than autonomous low-battery signaling. | Select MAX1642EUA+ only if system design mandates active shutdown - otherwise MAX1643EUA+ provides superior battery-state awareness. |
| TPS61200DRCR | Higher 0.3V start-up (vs. 0.88V), 90% peak efficiency, but requires external diode and has no integrated BATTLO or PFI/PFO. | Suitable for lithium-based systems with higher minimum input voltage; not viable for alkaline start-up below 0.9V. | Choose TPS61200DRCR only when input voltage stays ≥0.9V and external BOM cost is prioritized over integrated monitoring. |
Compared with MAX1642EUA+, the MAX1643EUA+ trades shutdown control for autonomous battery health reporting; compared with TPS61200DRCR, it delivers alkaline-specific start-up robustness and integrated dual-monitoring at the cost of slightly lower peak efficiency.
Availability
MAX1643EUA+ is available at Aetrix Electronics and suitable for personal medical monitors, remote controls, pagers, and pointing devices requiring stable component supply across extended production lifecycles.
Supply support for MAX1643EUA+ 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 demanding industrial, medical, and consumer applications.
The MAX1643EUA+ belongs to Maxim's ultra-low-power DC-DC converter product line, engineered specifically for single-primary-cell systems where start-up voltage, quiescent current, and integrated monitoring are critical.
FAQ
What is the guaranteed minimum start-up voltage for the MAX1643EUA+?
The MAX1643EUA+ guarantees start-up at 0.88V under all conditions, verified by correlation to internal switch on-resistance, timing parameters, and output voltage trip points. This enables reliable operation from nearly depleted alkaline cells. The MAX1643EUA+ achieves this via an integrated bootstrap oscillator that pumps the output to ~1.7V before main regulation begins.
Does the MAX1643EUA+ include a shutdown pin like the MAX1642EUA+?
No, the MAX1643EUA+ does not include a shutdown pin. Instead, it substitutes the SHDN function with a dedicated open-drain BATTLO output (Pin 3) that sinks current when battery voltage drops below 0.96V. This design choice prioritizes autonomous low-battery signaling over active control - a key differentiator from the MAX1642EUA+.
Can the MAX1643EUA+ operate with input voltages above 1.65V?
No, the MAX1643EUA+ has an absolute maximum BATT-to-GND rating of 6.0V, but its specified operating input voltage range is strictly 0.88V to 1.65V. Operation above 1.65V violates the recommended conditions in the datasheet and may cause premature wear or regulation instability. For higher-input applications, consider the MAX1644 or similar higher-VIN boost converters.
What is the purpose of the dual ground pins (Pins 1 and 6) on the MAX1643EUA+?
The MAX1643EUA+ features two separate GND pins (Pin 1 and Pin 6) to reduce thermal resistance and improve EMI performance. Pin 1 serves as the primary signal ground reference, while Pin 6 provides a dedicated low-impedance return path for high-frequency switching currents from the LX node. Both must be connected to the same solid ground plane using short, wide traces in a star configuration.
How does reverse-battery protection work in the MAX1643EUA+?
The MAX1643EUA+ incorporates internal reverse-battery protection via a 5Ω resistor in series with a diode, limiting reverse current to ≤220mA when the battery is inserted backward. This prevents latch-up or permanent damage without requiring external components. Prolonged exposure (>10 minutes) to 220mA reverse current may degrade performance, so system-level mechanical keying remains recommended.
MAX1643EUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX1643EUA+ FAQ
1.How can I place an order for MAX1643EUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1643EUA+ 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 MAX1643EUA+ reliable?
The price and inventory of MAX1643EUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1643EUA+ is usually 5 days.
3.What payment methods are accepted for MAX1643EUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1643EUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1643EUA+?
MAX1643EUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1643EUA+ 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 MAX1643EUA+?
For technical support, including MAX1643EUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1643EUA+ requirements.
6.How does Aetrix verify that MAX1643EUA+ is sourced from the original manufacturer or authorized distributors?
All MAX1643EUA+ 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 MAX1643EUA+ meets industry standards.
7.What is the process for return or replacement of MAX1643EUA+?
All MAX1643EUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1643EUA+, 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 MAX1643EUA+ part is unused and in its original packaging.
Return procedure for MAX1643EUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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