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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:1,393
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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 supply, and features a BOOST pin to raise oscillator frequency above audio band-used in op-amp power supplies and EIA/TIA-232E systems.
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 across full temperature range, BOOST-enabled high-frequency mode for reduced capacitor size, and compatibility with ICL7660/LTC1044 footprints in DIP-8 packaging.
Technical Context
The MAX1044CPA implements a charge-pump architecture using on-chip 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 topologies-including inverting, doubling, dividing, and multiplying-via external capacitor configuration. The LV pin allows low-voltage operation down to 1.5V when grounded, and the OSC pin accepts external clocking up to 400kHz for precise frequency control and synchronization.
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 RS-232 interface ICs without thermal derating in DIP-8. |
| Power Efficiency | 98% typical - minimizes heat generation and extends battery life in portable instruments. |
| Oscillator Frequency | 1kHz (typical, BOOST open) or ~6kHz (BOOST = V+) - higher frequency reduces required capacitor values and output ripple. |
| No-Load Supply Current | 200μA max at 5V - ensures ultra-low quiescent draw in always-on analog monitoring circuits. |
| Operating Temperature | 0°C to +70°C - validated for commercial-grade embedded systems and test equipment environments. |
| Package Type | 8-pin Plastic DIP - provides through-hole mounting, manual prototyping compatibility, and thermal performance up to 727mW at +70°C. |
Pinout & Package
MAX1044CPA uses an 8-pin plastic DIP package (0.300" wide) with standard through-hole footprint and 0.1" pin spacing. Thermal dissipation is rated at 727mW at +70°C with 9.09mW/°C derating above that temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Oscillator frequency boost control | Connecting to V+ raises internal oscillator frequency ~6×, reducing output impedance and enabling smaller external capacitors. |
| 2 - CAP+ | Positive terminal of charge-pump capacitor C1 | Connects to + side of bucket capacitor; polarity must match device marking to avoid latch-up or failure. |
| 3 - GND | Circuit ground reference | Serves as substrate connection and return path for all internal switches; requires low-impedance PCB plane for EMI control. |
| 4 - CAP- | Negative terminal of charge-pump capacitor C1 | Connects to – side of bucket capacitor; forms half of charge-transfer loop with CAP+ and internal switches. |
| 5 - VOUT | Negative voltage output node | Delivers inverted output (e.g., –5V from +5V); must not exceed GND potential-diode clamping recommended if risk of positive excursion exists. |
| 6 - LV | Low-voltage operation enable | Grounding enables operation down to 1.5V supply and improves oscillator stability below 3.5V; open above 3.5V for optimal efficiency. |
| 7 - OSC | External oscillator input / frequency control | Accepts external clock up to 400kHz; also accepts external capacitor to lower frequency-stray capacitance must be minimized. |
| 8 - V+ | Positive supply input | Supplies power and serves as substrate connection; absolute max rating is 10.5V; must be bypassed with 0.1μF ceramic near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting, doubling, dividing, multiplying capability | Single IC supports four voltage conversion modes via external capacitor reconfiguration-eliminates need for multiple dedicated converters. |
| BOOST pin for frequency scaling | Raising oscillator frequency ~6× lowers output resistance and ripple, enabling use of 10μF instead of 100μF capacitors in many designs. |
| No external diode required | On-chip MOSFET switches eliminate need for external Schottky diodes-even at 10V supply and full temperature range-reducing BOM count and layout area. |
| 1.5V minimum operating voltage | LV pin grounding enables reliable startup and regulation from single alkaline or NiMH cells, extending usability in ultra-low-power handheld instruments. |
| 98% typical power-conversion efficiency | Minimizes thermal load in enclosed enclosures and preserves battery runtime in portable data-acquisition systems. |
Applications
| Op-Amp Power Supplies | EIA/TIA-232E Power Supplies |
|---|---|
Use Scenario: Providing dual-rail ±5V supply for precision instrumentation amplifiers in handheld multimeters. IC Role / Device Role / Timing Role: Voltage inverter generating clean –5V rail from existing +5V logic supply, eliminating need for separate negative supply. Use Value: Enables rail-to-rail analog signal conditioning with <10mA load, leveraging 0.5V output drop and 98% efficiency to maintain accuracy over battery discharge. | Use Scenario: Generating compliant ±7.5V RS-232 driver voltages from a single 5V microcontroller supply in industrial serial gateways. IC Role / Device Role / Timing Role: Inverting converter delivering regulated negative voltage for line driver ICs such as MAX232-compatible transceivers. Use Value: Meets EIA/TIA-232E voltage swing requirements with no external diodes or inductors-reducing cost and board space by >30% vs. inductive solutions. |
| Portable Telephones | Panel Meters |
Use Scenario: Biasing RF front-end components and LCD contrast circuitry in legacy cordless phone handsets. IC Role / Device Role / Timing Role: Low-quiescent-current (200μA max) inverter supplying –3V from 3.3V system rail during standby and active modes. Use Value: Extends talk time by minimizing idle current draw while maintaining fast wake-up response due to integrated oscillator and no external timing components. | Use Scenario: Powering analog front-end and display drivers in DIN-rail-mounted digital panel meters with isolated 24V DC input. IC Role / Device Role / Timing Role: Compact inverting converter generating –5V for op-amp signal conditioning and ADC reference buffers from local 5V regulator output. Use Value: Fits within tight enclosure height constraints using DIP-8 package; achieves stable output under varying load (0–8mA) via BOOST-enabled 6kHz operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICL7660CPA | No BOOST pin; nominal oscillator frequency ~10kHz (vs. 1kHz base / ~6kHz boosted for MAX1044CPA); identical pinout and DIP-8 package. | Lacks frequency-scaling capability-requires larger capacitors for equivalent ripple performance at same load. | Select ICL7660CPA only when BOOST functionality is unnecessary and legacy design compatibility is prioritized over capacitor size reduction. |
| MAX660CPA | Higher output current (100mA vs. 10mA); lower voltage drop (<0.65V); uses different pinout and SO-8 package-not pin-compatible. | Supports higher-power analog subsystems (e.g., multi-channel data acquisition), but requires PCB redesign and layout changes. | Choose MAX660CPA when >10mA load current or tighter regulation is required-accepting non-drop-in replacement and SO-8 footprint. |
Compared with ICL7660CPA, MAX1044CPA adds BOOST-driven frequency scaling for lower output impedance and smaller capacitors; compared with MAX660CPA, it offers pin compatibility with legacy ICL7660 designs but trades off current capability for footprint continuity and cost efficiency in low-power applications.
Availability
MAX1044CPA is available at Aetrix Electronics and suitable for op-amp power supplies, EIA/TIA-232E interfaces, and portable telephony applications requiring stable component supply, long-term obsolescence management, and commercial-temperature-grade reliability.
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 precision analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX1044CPA belongs to Maxim's switched-capacitor voltage converter product line, engineered for compact, inductor-free DC-DC conversion in space-constrained and low-noise analog systems.
FAQ
What is the maximum output current capability of the MAX1044CPA?
The MAX1044CPA delivers up to 10mA of continuous output current with a 0.5V output voltage drop at 5V input. This specification is guaranteed over the full 0°C to +70°C operating temperature range and applies to inverting configurations. Exceeding 10mA may cause excessive output voltage sag or thermal stress in the 8-pin DIP package, which has a 727mW power dissipation limit at +70°C. For higher current needs, the MAX660CPA is recommended.
Does the MAX1044CPA require external diodes for operation?
No, the MAX1044CPA does not require external diodes. Its on-chip CMOS power MOSFET switches replace discrete diodes, enabling full operation from 1.5V to 10V supply across the entire temperature range without external rectification. This eliminates forward-voltage losses and simplifies layout-unlike older charge-pump designs that mandated Schottky diodes. The MAX1044CPA maintains this advantage even at elevated temperatures where diode leakage would degrade performance.
How does the BOOST pin affect the oscillator frequency of the MAX1044CPA?
Connecting the BOOST pin (Pin 1) to V+ increases the internal oscillator frequency by approximately six times-for example, from ~1kHz (BOOST open) to ~6kHz. This higher frequency reduces output impedance, output ripple, and required external capacitor values. When driven by an external clock, the BOOST pin has no effect and must be left open. The frequency shift is confirmed in Figure 9 of the MAX1044 datasheet and is independent of supply voltage or temperature variation.
Can the MAX1044CPA operate from a 1.5V supply?
Yes, the MAX1044CPA can operate from a 1.5V supply when the LV pin (Pin 6) is connected to GND. This bypasses the internal voltage regulator and enables reliable startup and regulation down to the absolute minimum supply voltage. At 1.5V, output current capability is reduced, and oscillator frequency drops-but the device remains functional for ultra-low-power applications like battery-backed sensors. Performance at 1.5V is fully characterized and guaranteed per the Electrical Characteristics table.
Is the MAX1044CPA pin-compatible with the ICL7660CPA?
Yes, the MAX1044CPA is fully pin-compatible with the ICL7660CPA in the 8-pin DIP package. Pin functions match exactly, including GND (Pin 3), VOUT (Pin 5), and V+ (Pin 8). The only functional difference is that Pin 1 is labeled BOOST on the MAX1044CPA and N.C. on the ICL7660CPA-leaving it unconnected in ICL7660 designs has no adverse effect. This allows direct substitution in existing layouts without PCB modification.
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:
- 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:
- 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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