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Analog Devices Inc./Maxim Integrated MAX1044ESA+
- Part No.:
- MAX1044ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1044ESA+.pdf
- Description:
- IC REG CHARGE PUMP 20MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:338
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Product details
Overview
The MAX1044ESA+ from Maxim Integrated is a CMOS switched-capacitor voltage converter IC that inverts +5V to -5V for analog circuit power supplies, delivers 10mA output with 0.5V drop at 5V input, operates from 1.5V to 10V, and features a BOOST pin to raise oscillator frequency above audio band. It is used in EIA/TIA-232E power supplies and handheld instruments requiring compact negative rail generation.
For engineers reviewing the MAX1044ESA+ datasheet, MAX1044ESA+ pinout, MAX1044ESA+ application, or MAX1044ESA+ 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 MAX1044ESA+ integrates four on-chip power MOSFET switches, oscillator control circuitry, and internal regulation logic. Its charge-pump architecture synthesizes an equivalent output resistance inversely proportional to oscillator frequency and capacitor value (REQUIV ≈ 1/(fOSC/2 × C1)).
Operation supports inversion, doubling, division, and multiplication modes via external capacitor configuration. The BOOST pin (Pin 1) raises fOSC by ~6× when tied to V+, reducing output impedance and ripple while shifting noise out of audio band - a capability absent in the ICL7660.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 10.0V - enables direct use from single-cell Li-ion (3.0V) or dual AA (3.0V) up to industrial 10V rails. |
| Output Current | 10mA with 0.5V drop at 5V input - sufficient for op-amp biasing and RS-232 transceivers without thermal derating. |
| Power Efficiency | 95–98% typical - minimizes heat rise in sealed handheld enclosures and extends battery life in portable instruments. |
| No-Load Supply Current | 200μA max at 5V - critical for low-power sleep-mode operation in panel meters and data-acquisition systems. |
| Oscillator Frequency | 1kHz (typ, BOOST open) or ~6kHz (BOOST = V+) - higher frequency reduces required C1/C2 size and output ripple. |
| Operating Temperature | -40°C to +85°C - qualified for automotive cabin electronics and industrial field equipment. |
| Output Resistance | 65Ω typ at 25°C, 5kHz - defines load regulation: ΔVOUT = ILOAD × ROUT, e.g., -4.5V at 10mA from 5V input. |
Pinout & Package
Package: 8-pin SO (Small Outline), RoHS-compliant, surface-mount, 1.27mm pitch, JEDEC MS-012AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Oscillator frequency boost control | Connect to V+ to increase fOSC ~6×; left open for nominal operation; no effect when OSC driven externally. |
| 2 - CAP+ | Positive terminal of charge-pump capacitor C1 | Node where C1 charges from V+ during first half-cycle; requires low-ESR ceramic capacitor (e.g., 10μF X7R). |
| 3 - GND | Circuit ground reference | Substrate connection and return path for all internal switches; must be low-impedance plane for EMI control. |
| 4 - CAP- | Negative terminal of charge-pump capacitor C1 | Swings between GND and VOUT; polarity reversal enables voltage inversion; ties to C1's negative lead. |
| 5 - VOUT | Negative output voltage terminal | Delivers inverted voltage (e.g., -5V from +5V); connects to reservoir capacitor C2's negative terminal. |
| 6 - LV | Low-voltage operation enable | Ground for V+ < 3.5V to bypass internal regulator; improves startup at 1.5V but increases quiescent current above 5V. |
| 7 - OSC | External oscillator control | Accepts external clock up to 400kHz; connect 1pF–100pF capacitor to reduce fOSC; minimize stray capacitance. |
| 8 - V+ | Positive supply input | 1.5V–10V input; also substrate connection; requires 0.1μF bypass capacitor close to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Inversion/doubling/division/multiplication modes | Single IC supports multiple topologies via capacitor reconfiguration - eliminates need for separate dedicated converters. |
| BOOST pin for oscillator frequency scaling | Raises fOSC ~6× to reduce output impedance (e.g., from 130Ω to ~22Ω) and allow 10μF instead of 100μF capacitors. |
| No external diode required | Enables full-temperature-range operation without series Schottky diodes - simplifies BOM and PCB layout for RS-232 supplies. |
| 1.5V minimum operating voltage | Supports direct use from single alkaline or NiMH cells - critical for battery-powered handheld instruments and portable telephones. |
| 98% typical power-conversion efficiency | Reduces thermal load in space-constrained enclosures like panel meters and data-acquisition modules. |
Applications
| Personal Communications Equipment | Op-Amp Power Supplies |
|---|---|
Use Scenario: Generating isolated negative rail in compact GSM/GPRS modems where board space limits inductor-based solutions. IC Role / Device Role / Timing Role: Voltage inverter converting +3.3V system rail to -3.3V for RF front-end biasing and analog signal conditioning. Use Value: Eliminates need for bulky inductors and feedback components; achieves -3.3V ±5% at 5mA with 10μF/10μF capacitors. | Use Scenario: Dual-rail powering of precision instrumentation amplifiers in portable multimeters and sensor interfaces. IC Role / Device Role / Timing Role: Negative voltage generator supplying -5V to op-amp V– pin while +5V logic rail powers microcontroller and ADC. Use Value: Maintains rail symmetry under 10mA load; 0.5V dropout ensures stable -4.5V output for rail-to-rail input op-amps. |
| EIA/TIA-232E Power Supplies | Handheld Instruments |
Use Scenario: Providing ±12V RS-232 driver voltages from a single +5V USB-derived supply in embedded serial adapters. IC Role / Device Role / Timing Role: Inverting +5V to -5V stage feeding a charge-pump doubler (e.g., MAX660) to reach -12V. Use Value: Enables compliant ±12V outputs with <100mV ripple at 10mA; BOOST pin suppresses audible switching noise in office environments. | Use Scenario: Powering LCD bias and analog front-end in battery-operated oscilloscope probes and thermal imagers. IC Role / Device Role / Timing Role: Low-quiescent-current (-40°C to +85°C rated) inverter generating -3V from 3.6V Li-ion for display contrast control. Use Value: 200μA max no-load current extends battery runtime; SO package allows 0.65mm-pitch automated assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICL7660ESA | No BOOST pin; fixed ~10kHz oscillator; identical pinout and SO-8 package. | Lacks high-frequency mode - requires larger capacitors (e.g., 100μF vs. 10μF) for same ripple performance. | Select ICL7660ESA only if audio-band noise is acceptable and board space permits larger caps. |
| MAX660CSA+ | Inductorless 100mA inverter; integrated oscillator; 0.65V dropout at 100mA; SO-8 package. | Higher current capability but 3× higher quiescent current (240μA vs. 200μA) and no BOOST control. | Choose MAX660CSA+ when >20mA load current is required; not suitable for ultra-low-power sleep modes. |
Compared with ICL7660ESA and MAX660CSA+, the MAX1044ESA+ uniquely balances 10mA output, ultra-low quiescent current, and BOOST-enabled frequency scaling - making it optimal for space-constrained, battery-sensitive applications needing clean, adjustable negative rails.
Availability
MAX1044ESA+ is available at Aetrix Electronics and suitable for EIA/TIA-232E power supplies, handheld instruments, and op-amp power supplies requiring stable component supply across industrial temperature ranges.
Supply support for MAX1044ESA+ 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 MAX1044ESA+ belongs to Maxim's switched-capacitor voltage converter product line, engineered for compact, inductor-free DC-DC conversion in portable and space-constrained systems.
FAQ
What is the function of the BOOST pin on the MAX1044ESA+?
The BOOST pin (Pin 1) on the MAX1044ESA+ raises the internal oscillator frequency by approximately six times when connected to V+. This reduces output impedance, lowers output ripple, shrinks required external capacitor values (e.g., 10μF instead of 100μF), and shifts switching noise above the audio band. When left open, the MAX1044ESA+ operates at its nominal ~1kHz frequency. The BOOST feature is exclusive to the MAX1044ESA+ and not present in the pin-compatible ICL7660ESA.
Can the MAX1044ESA+ generate a +10V output from a +5V input?
Yes, the MAX1044ESA+ can double the input voltage to generate +10V from +5V using the voltage-doubler configuration shown in Figure 9 of the datasheet. This requires two external capacitors and Schottky diodes to minimize forward voltage drop. However, output voltage is unregulated and drops under load due to output resistance; at 10mA, expect ~9.3V output. For regulated +10V, pair the MAX1044ESA+ with a low-dropout linear regulator.
What is the maximum continuous output current of the MAX1044ESA+?
The MAX1044ESA+ delivers 10mA continuous output current with a 0.5V output drop when supplied from 5V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. At lower input voltages (e.g., 3.0V), output current capability decreases due to higher relative losses; at 10V input, it remains ~10mA but with improved efficiency. Exceeding 10mA risks thermal overload in the SO-8 package without heatsinking.
How does the LV pin affect operation of the MAX1044ESA+?
The LV (Low-Voltage) pin (Pin 6) on the MAX1044ESA+ bypasses an internal voltage regulator to enable operation down to 1.5V. Grounding LV improves low-voltage startup and increases oscillator frequency but raises quiescent current at higher supply voltages. For V+ < 3.5V, LV must be grounded; for V+ > 3.5V, it may be left open. Unlike the ICL7660ESA, the MAX1044ESA+ allows LV grounding across the full 1.5V–10V range without damage.
Is the MAX1044ESA+ pin-compatible with the ICL7660ESA?
Yes, the MAX1044ESA+ is fully pin-compatible with the ICL7660ESA in the 8-pin SO package, sharing identical pin functions for CAP+, GND, CAP-, VOUT, LV, OSC, and V+. The only difference is Pin 1: labeled BOOST on the MAX1044ESA+ and N.C. (No Connection) on the ICL7660ESA. This allows drop-in replacement in existing ICL7660ESA designs, with optional BOOST functionality added if needed - no PCB changes required.
MAX1044ESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX1044ESA+ FAQ
1.How can I place an order for MAX1044ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1044ESA+ 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 MAX1044ESA+ reliable?
The price and inventory of MAX1044ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1044ESA+ is usually 5 days.
3.What payment methods are accepted for MAX1044ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1044ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1044ESA+?
MAX1044ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1044ESA+ 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 MAX1044ESA+?
For technical support, including MAX1044ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1044ESA+ requirements.
6.How does Aetrix verify that MAX1044ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX1044ESA+ 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 MAX1044ESA+ meets industry standards.
7.What is the process for return or replacement of MAX1044ESA+?
All MAX1044ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1044ESA+, 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 MAX1044ESA+ part is unused and in its original packaging.
Return procedure for MAX1044ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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