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Analog Devices Inc./Maxim Integrated MAX1044CPA+
- Part No.:
- MAX1044CPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX1044CPA+.pdf
- Description:
- IC REG CHARGE PUMP 20MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,701
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Product details
Overview
The MAX1044CPA+ from Maxim Integrated is a monolithic CMOS switched-capacitor voltage converter that inverts +5V to -5V, delivers 10mA output with 0.5V drop, operates from 1.5V to 10V, and features a BOOST pin to raise oscillator frequency above audio band-used for generating negative supplies in op-amp and RS-232 power rails.
For engineers reviewing the MAX1044CPA+ datasheet, MAX1044CPA+ pinout, MAX1044CPA+ application, or MAX1044CPA+ equivalent, key selection criteria include its 98% typical power-conversion efficiency, no-external-diode operation over full temperature range, BOOST-enabled high-frequency mode for reduced capacitor size, and compatibility with ICL7660/LTC1044 designs.
Technical Context
The MAX1044CPA+ implements a charge-pump topology using four on-chip power MOSFET switches and an internal oscillator to synthesize negative or doubled voltages without inductors. Its BOOST pin enables ~6× oscillator frequency increase (e.g., from ~1kHz to ~6kHz), directly lowering output impedance and ripple while shifting switching noise out of audible range.
It supports multiple configurations: inverting (VOUT = –V+), doubling (VOUT = 2V+ – 2VD), dividing (VOUT = V+/2), and multiplying. The LV pin allows low-voltage operation down to 1.5V when grounded, and the OSC pin accepts external capacitors or clock sources up to 400kHz for precise frequency control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 10.0V - enables direct use from single-cell Li-ion or standard logic rails without pre-regulation. |
| Output Current | 10mA at 0.5V drop - sufficient for biasing dual op-amps or powering RS-232 transceivers. |
| Power Efficiency | 95–98% typical - minimizes heat generation and extends battery life in portable instruments. |
| Oscillator Frequency | ~1kHz (BOOST open) or ~6kHz (BOOST = V+) - higher frequency reduces required capacitor size and output ripple. |
| No-Load Supply Current | 200μA max at 5V - ultra-low quiescent draw critical for always-on sensor nodes. |
| Output Resistance | 65Ω typical at +25°C - determines load regulation; drops further with BOOST enabled or paralleled devices. |
| Operating Temp Range | 0°C to +70°C - commercial-grade thermal envelope suitable for handheld test equipment and panel meters. |
Pinout & Package
MAX1044CPA+ uses an 8-pin plastic DIP package (0.300" wide), with through-hole mounting and RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Oscillator frequency boost control | Connect to V+ to raise internal oscillator frequency ~6×; improves ripple, lowers output impedance, shifts noise above 20kHz. |
| 2 - CAP+ | Positive terminal of charge-pump capacitor C1 | Interface point for bucket capacitor; polarity must match device marking to avoid latch-up or failure. |
| 3 - GND | Ground reference and substrate connection | Primary return path; must be low-impedance and adjacent to C1/C2 ground pins to minimize EMI. |
| 4 - CAP- | Negative terminal of charge-pump capacitor C1 | Completes charge-transfer loop with CAP+; incorrect polarity causes functional failure. |
| 5 - VOUT | Negative voltage output terminal | Delivers inverted supply; must not exceed GND potential - add protection diode if risk of backfeed exists. |
| 6 - LV | Low-voltage operation enable | Ground for V+ < 3.5V to bypass internal regulator; improves startup and stability at 1.5V–2.5V inputs. |
| 7 - OSC | Oscillator control input | Accepts external capacitor (COSC) to lower frequency or TTL/CMOS clock up to 400kHz for synchronization. |
| 8 - V+ | Positive input supply (1.5V–10V) | Also serves as substrate connection; requires local 0.1μF bypass capacitor between V+ and GND. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting, doubling, dividing, multiplying capability | Single IC replaces discrete charge-pump networks for ±5V, +10V, or +2.5V rails in space-constrained designs. |
| BOOST pin for frequency scaling | Enables 6× oscillator speedup without external components - cuts C1/C2 size by ~6× and eliminates audible whine. |
| No external diode required | On-chip MOSFET switches eliminate Schottky diodes, reducing BOM count, board area, and forward-voltage loss. |
| 1.5V minimum operating voltage | Supports direct interface with low-power microcontrollers and sensors powered from single alkaline or LiFePO₄ cells. |
| Pin-compatible with ICL7660/LTC1044 | Drop-in replacement for legacy designs - same pinout, footprint, and basic functionality with enhanced BOOST capability. |
Applications
| Op-Amp Power Supplies | EIA/TIA-232E Power Supplies |
|---|---|
Use Scenario: Dual-supply op-amps in portable data-acquisition front-ends require clean ±5V rails from a single +5V source. IC Role / Device Role / Timing Role: MAX1044CPA+ acts as a compact, inductorless negative voltage generator delivering regulated -5V at ≤10mA. Use Value: Eliminates need for bulky inductive DC/DC converters or dual-output wall adapters - reduces PCB area by >40% vs. transformer-based solutions. | Use Scenario: RS-232 line drivers in handheld terminals need ±12V or ±5V from a 3.3V/5V system rail. IC Role / Device Role / Timing Role: MAX1044CPA+ provides isolated negative voltage for driver biasing, with BOOST pin suppressing audible switching noise. Use Value: Meets EIA/TIA-232E voltage compliance (±5V min) while maintaining low EMI in battery-powered communication modules. |
| Handheld Instruments | Panel Meters |
Use Scenario: Digital multimeters and oscilloscope probes require stable bipolar supplies for analog front-end amplifiers and ADC references. IC Role / Device Role / Timing Role: MAX1044CPA+ generates precision -5V from main +5V rail, with LV pin enabling reliable startup at cold temperatures. Use Value: Achieves <10mV output ripple under 5mA load (with 10μF caps), supporting 16-bit ADC accuracy without additional LDO post-regulation. | Use Scenario: Industrial panel meters with LCD displays and analog inputs operate from 24V DC but need ±15V for signal conditioning. IC Role / Device Role / Timing Role: MAX1044CPA+ used in cascaded configuration (two devices) to generate -15V from intermediate +15V rail. Use Value: Enables cost-effective bipolar supply generation without custom magnetics - avoids $2–$4 per-unit cost of isolated flyback modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor voltage conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICL7660CPA | No BOOST pin; nominal oscillator ~10kHz (vs. MAX1044's ~1kHz base); identical pinout and 1.5V–10V range. | Lacks frequency-scaling capability - unsuitable where audio-band noise or small capacitor size is critical. | Select ICL7660CPA only for legacy drop-in replacements where BOOST functionality is unused and existing layout cannot be modified. |
| MAX660CPA+ | Higher output current (100mA vs. 10mA); <0.65V dropout; integrated oscillator; no BOOST or LV pins. | Designed for higher-power analog rails - requires larger external capacitors and lacks low-voltage (<2V) support. | Choose MAX660CPA+ when load exceeds 20mA or when tighter output regulation under varying loads is required. |
Compared with ICL7660CPA, MAX1044CPA+ adds design flexibility via BOOST and LV pins for noise-sensitive or ultra-low-voltage applications; compared with MAX660CPA+, it trades output current for smaller solution size, lower quiescent current, and broader input voltage adaptability.
Availability
MAX1044CPA+ is available at Aetrix Electronics and suitable for handheld instruments, panel meters, and RS-232 interface circuits requiring stable component supply across commercial temperature ranges.
Supply support for MAX1044CPA+ 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 high-performance analog and mixed-signal ICs for power management, sensing, and interface applications.
The MAX1044CPA+ belongs to Maxim's switched-capacitor voltage converter product line, engineered for compact, inductorless DC/DC conversion in portable and space-constrained systems.
FAQ
What is the primary function of the BOOST pin on the MAX1044CPA+?
The BOOST pin on the MAX1044CPA+ raises the internal oscillator frequency by approximately six times when tied to V+. This increases switching frequency from ~1kHz to ~6kHz, which reduces output impedance, decreases output voltage ripple, allows smaller external capacitors (C1/C2), and shifts switching noise above the audible range - critical for noise-sensitive analog applications.
Can the MAX1044CPA+ operate from a 1.8V supply?
Yes, the MAX1044CPA+ supports operation from 1.5V to 10V. For reliable startup and stable performance at 1.8V, the LV pin must be connected to GND to bypass the internal voltage regulator. This configuration ensures proper oscillator and switch gate drive at low input voltages, as confirmed in the Electrical Characteristics table for V+ ≥ 1.5V.
How does the MAX1044CPA+ differ from the ICL7660CPA in terms of pin compatibility and functionality?
The MAX1044CPA+ is fully pin-compatible with the ICL7660CPA in 8-pin DIP packaging, sharing identical pin assignments and basic charge-pump functionality. However, pin 1 is BOOST (functional) on MAX1044CPA+, whereas it is N.C. on ICL7660CPA. This makes MAX1044CPA+ a functional superset - it operates identically when BOOST is left open, but adds frequency-scaling capability when utilized.
What is the maximum continuous output current specification for the MAX1044CPA+?
The MAX1044CPA+ delivers up to 10mA of continuous output current with a 0.5V output voltage drop at room temperature, as specified in the General Description and confirmed in the Electrical Characteristics table under "Output Resistance" and load-line graphs. Output current capability decreases at elevated temperatures or lower input voltages due to increased internal losses.
Does the MAX1044CPA+ require external diodes for operation?
No, the MAX1044CPA+ does not require external diodes. Its on-chip power MOSFET switches replace traditional diodes, enabling efficient charge transfer without forward-voltage drop or reverse-recovery losses. This is explicitly stated in the General Description and Absolute Maximum Ratings note, and verified across all operating conditions including full temperature and voltage ranges.
MAX1044CPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Ratiometric
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- -Vin, nVin, Vin/2
- Voltage - Output (Max):
- -
- Current - Output:
- 20mA
- Frequency - Switching:
- 10kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX1044CPA+ FAQ
1.How can I place an order for MAX1044CPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1044CPA+ 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 MAX1044CPA+ reliable?
The price and inventory of MAX1044CPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1044CPA+ is usually 5 days.
3.What payment methods are accepted for MAX1044CPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1044CPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1044CPA+?
MAX1044CPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1044CPA+ 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 MAX1044CPA+?
For technical support, including MAX1044CPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1044CPA+ requirements.
6.How does Aetrix verify that MAX1044CPA+ is sourced from the original manufacturer or authorized distributors?
All MAX1044CPA+ 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 MAX1044CPA+ meets industry standards.
7.What is the process for return or replacement of MAX1044CPA+?
All MAX1044CPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1044CPA+, 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 MAX1044CPA+ part is unused and in its original packaging.
Return procedure for MAX1044CPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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