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Analog Devices Inc./Maxim Integrated MAX1044EPA
- Part No.:
- MAX1044EPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX1044EPA.pdf
- Description:
- IC REG CHARGE PUMP 20MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,731
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Product details
Overview
The MAX1044EPA from Maxim Integrated is a CMOS switched-capacitor voltage converter IC that inverts, doubles, divides, or multiplies input voltages without external diodes. It operates from 1.5V to 10V, delivers up to 10mA with ≤0.5V output drop, and features a BOOST pin to raise oscillator frequency above the audio band-enabling smaller external capacitors. It is commonly used to generate -5V from +5V logic supplies for op-amp power rails in portable instrumentation.
For engineers reviewing the MAX1044EPA datasheet, MAX1044EPA pinout, MAX1044EPA application, or MAX1044EPA equivalent, key selection considerations include its -40°C to +85°C industrial temperature range, BOOST-enabled high-frequency operation (up to ~6× nominal), no-external-diode architecture, and compatibility with ICL7660/LTC1044 designs requiring negative or doubled supply rails.
Technical Context
The MAX1044EPA implements a charge-pump topology using on-chip MOSFET switches, internal oscillator, and control logic to synthesize voltage conversion functions. Its BOOST pin directly modulates oscillator frequency-raising it by ~6× when tied to V+, reducing output impedance and ripple while shifting noise out of the audio band.
It supports multiple configurations (inverter, doubler, divider, multiplier) via external capacitor routing, and includes LV pin control for low-voltage operation down to 1.5V. Output voltage is unregulated and load-dependent, with typical output resistance of 65Ω at +25°C (100Ω max over full temperature range).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 10.0V - enables direct use with single-cell Li-ion, 3.3V, and 5V logic rails |
| Output Current | 10mA - sufficient for biasing low-power op-amps, RS-232 transceivers, and sensor signal chains |
| Output Drop | ≤0.5V at 10mA - defines worst-case deviation from ideal -V+ or +2V+ output under load |
| Quiescent Current | 200μA max at 5V - ensures ultra-low standby power in battery-powered handheld instruments |
| Oscillator Frequency | 1kHz (min, MAX1044) - base switching frequency; BOOST raises it ~6× for reduced capacitor size and EMI |
| Power Efficiency | 95–98% typical - minimizes heat generation and extends battery life in portable systems |
| Operating Temp | -40°C to +85°C - qualified for industrial and automotive cabin-ambient environments |
Pinout & Package
MAX1044EPA uses an 8-pin plastic DIP package (0.300" wide), with through-hole mounting and industry-standard footprint compatible with ICL7660CPA/EPA and LTC1044.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Oscillator frequency control input (MAX1044 only) | Tying to V+ raises internal oscillator frequency ~6×, lowering output impedance and enabling smaller external capacitors |
| 2 - CAP+ | Positive terminal connection for charge-pump capacitor C1 | Connects to +V side of flying capacitor; polarity must match device marking to avoid latch-up |
| 3 - GND | Circuit ground reference and substrate connection | Serves as return path for all internal switches; requires low-impedance PCB ground plane for EMI control |
| 4 - CAP- | Negative terminal connection for charge-pump capacitor C1 | Completes flying capacitor loop; incorrect polarity causes failure or excessive ripple |
| 5 - VOUT | Negative or multiplied output voltage terminal | Delivers inverted (-V+), doubled (+2V+), or divided output depending on external capacitor configuration |
| 6 - LV | Low-voltage operation enable | Grounding improves performance below 3.5V; open above 3.5V; MAX1044 allows grounding across full range |
| 7 - OSC | Internal oscillator control or external clock input | Accepts external HCMOS clock up to 400kHz; external capacitor lowers frequency; stray capacitance must be minimized |
| 8 - V+ | Positive power supply input (1.5V–10V) | Also serves as substrate connection; bypass capacitor (0.1μF) required between V+ and GND for stability |
Key Features
| Feature | Design Value |
|---|---|
| BOOST pin functionality | Enables 6× oscillator frequency boost to reduce output impedance, ripple, and required capacitor size |
| No external diode requirement | Eliminates discrete diode count and forward-voltage loss-simplifying BOM and improving efficiency at low V+ |
| Wide supply range (1.5V–10V) | Supports direct integration with modern low-voltage microcontrollers and legacy 5V logic without level-shifting |
| 98% typical power-conversion efficiency | Minimizes thermal rise in enclosed handheld instruments and extends battery runtime in portable telephones |
| LV pin for sub-3.5V operation | Allows reliable startup and regulation down to 1.5V-critical for single-cell alkaline or LiFePO₄ battery systems |
Applications
| Op-Amp Power Supplies | EIA/TIA-232E Power Supplies |
|---|---|
Use Scenario: Providing dual-rail ±5V supplies for precision op-amps in battery-powered data-acquisition front-ends. IC Role / Device Role / Timing Role: Voltage inverter generating clean -5V rail from existing +5V logic supply. Use Value: Eliminates need for separate negative supply IC or inductor-based DC/DC, reducing board area and EMI in compact analog signal chains. | Use Scenario: Generating ±12V RS-232 driver/receiver supplies from a single 5V system rail in portable terminals. IC Role / Device Role / Timing Role: Dual-output charge-pump configured as inverter + doubler to produce both negative and boosted positive rails. Use Value: Meets EIA/TIA-232E voltage compliance with minimal external components-no inductors or transformers required. |
| Handheld Instruments | Panel Meters |
Use Scenario: Powering LCD bias circuitry and analog front-end sensors in handheld multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Low-noise negative voltage generator supporting high-impedance measurement inputs and display drivers. Use Value: BOOST pin operation shifts switching noise above audible range, preventing interference with sensitive analog measurements. | Use Scenario: Supplying isolated analog rails for 4–20mA transmitter conditioning circuits and LED segment drivers in industrial panel meters. IC Role / Device Role / Timing Role: Inverting +5V system supply to create dedicated -5V reference for current-loop sensing and DAC biasing. Use Value: Industrial-grade -40°C to +85°C rating ensures stable operation in factory-floor enclosures with wide ambient swings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICL7660EPA | No BOOST pin; fixed oscillator (~10kHz typ); identical pinout and temp range (-40°C to +85°C) | Lacks high-frequency mode for ripple/noise reduction; lower output current capability at same V+ | Select when BOOST functionality is unnecessary and cost sensitivity outweighs ripple/noise optimization needs. |
| MAX660ESA | Higher output current (100mA); integrated feedback for regulated output; different pinout and package (8-SO) | Supports regulated -5V or +5V outputs; requires feedback resistor network; not pin-compatible | Select when >10mA load current or output regulation is required-accepting layout change and higher BOM cost. |
Compared with ICL7660EPA, MAX1044EPA offers superior noise performance and lower output impedance via BOOST; compared with MAX660ESA, it trades regulation and current capability for simplicity, cost, and pin compatibility with legacy ICL7660 designs.
Availability
MAX1044EPA is available at Aetrix Electronics and suitable for portable telephones, handheld instruments, and panel meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1044EPA 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, communications, and consumer applications.
The MAX1044 belongs to Maxim's switched-capacitor voltage converter product line, engineered for low-noise, inductorless DC/DC conversion in space-constrained portable and industrial systems.
FAQ
What is the maximum output current of the MAX1044EPA?
The MAX1044EPA delivers up to 10mA of continuous output current with ≤0.5V output voltage drop at +25°C. Performance degrades at temperature extremes and higher loads due to increased output resistance-verified in Electrical Characteristics tables across -40°C to +85°C. For >10mA requirements, the MAX660ESA is a documented alternative.
Does the MAX1044EPA require external diodes?
No, the MAX1044EPA does not require external diodes for operation across its full 1.5V–10V supply range and -40°C to +85°C temperature range. Its on-chip MOSFET switches eliminate forward-voltage losses and simplify design-unlike older charge-pump ICs that mandate external Schottky diodes for reliable inversion.
How does the BOOST pin affect MAX1044EPA performance?
Tying the BOOST pin to V+ raises the MAX1044EPA's internal oscillator frequency by approximately 6×, which reduces output impedance, output ripple, and required external capacitor values. This shift also moves switching noise above the audio band-critical for noise-sensitive analog circuits powered by the MAX1044EPA.
Can the MAX1044EPA operate from a 1.5V supply?
Yes, the MAX1044EPA is fully specified to operate from 1.5V to 10V. For reliable startup and regulation at 1.5V–3.5V, the LV pin must be grounded per datasheet guidance. At 1.5V, output current capability decreases, and oscillator frequency drops-verified in Typical Operating Characteristics curves for quiescent current vs. supply voltage.
Is the MAX1044EPA pin-compatible with the ICL7660EPA?
Yes, the MAX1044EPA is pin-compatible with the ICL7660EPA in the 8-pin DIP package, sharing identical pin assignments except that pin 1 (BOOST on MAX1044EPA) is N.C. on ICL7660EPA. No PCB changes are required when upgrading-though BOOST functionality must be left unconnected or tied to V+ only if leveraging the enhanced performance.
MAX1044EPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX1044EPA FAQ
1.How can I place an order for MAX1044EPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1044EPA 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 MAX1044EPA reliable?
The price and inventory of MAX1044EPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1044EPA is usually 5 days.
3.What payment methods are accepted for MAX1044EPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1044EPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1044EPA?
MAX1044EPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1044EPA 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 MAX1044EPA?
For technical support, including MAX1044EPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1044EPA requirements.
6.How does Aetrix verify that MAX1044EPA is sourced from the original manufacturer or authorized distributors?
All MAX1044EPA 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 MAX1044EPA meets industry standards.
7.What is the process for return or replacement of MAX1044EPA?
All MAX1044EPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX1044EPA, 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 MAX1044EPA part is unused and in its original packaging.
Return procedure for MAX1044EPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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