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Analog Devices Inc./Maxim Integrated MAX1044ESA+T
- Part No.:
- MAX1044ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1044ESA+T.pdf
- Description:
- IC REG CHARGE PUMP 20MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,953
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Product details
Overview
The MAX1044ESA+T 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 to power op-amp analog circuitry from single-supply logic rails.
For engineers reviewing the MAX1044ESA+T datasheet, MAX1044ESA+T pinout, MAX1044ESA+T application, or MAX1044ESA+T equivalent, key selection criteria include inverting efficiency at light loads, BOOST-enabled ripple reduction, no-external-diode operation down to 1.5V, and SO-8 package compatibility with ICL7660/ LTC1044 footprints.
Technical Context
The MAX1044ESA+T implements a four-MOSFET charge-pump topology with on-chip oscillator and internal regulator bypass via LV pin. Its BOOST pin increases switching frequency ~6× when tied to V+, directly lowering output impedance and enabling smaller external capacitors.
Unlike the ICL7660, the MAX1044ESA+T supports low-voltage operation (1.5V) with LV grounded, and its oscillator frequency varies with supply voltage and temperature-typical 1kHz at 2V, 5kHz at 5V, and up to ~30kHz with BOOST enabled-enabling design trade-offs between quiescent current, ripple, and capacitor size.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 10.0V - enables direct use from Li-ion, 3.3V, or 5V rails without pre-regulation |
| Output Current | 10mA with 0.5V drop - sufficient for biasing dual op-amps or RS-232 interface ICs |
| Power Efficiency | 95–98% typical - minimizes heat rise in space-constrained portable instruments |
| Oscillator Frequency | 1kHz (min, V+=2V) to ~30kHz (BOOST=V+) - shifts noise out of audio band and reduces C1/C2 size |
| No-Load Supply Current | 200μA max at 5V - supports battery-powered handheld meters with multi-week standby |
| Operating Temp Range | -40°C to +85°C - qualified for industrial and automotive cabin electronics |
| Output Resistance | 65Ω typ (25°C, 5kHz) - defines load regulation: ΔVOUT ≈ ILOAD × ROUT |
Pinout & Package
MAX1044ESA+T uses an 8-pin SO (Small Outline) package with standard 1.27mm pitch, JEDEC MS-012AC compliant footprint, and exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Oscillator frequency control input | Tie to V+ to increase fOSC ~6×; leaves oscillator unmodified when open |
| 2 - CAP+ | Positive terminal of bucket capacitor C1 | Connects to C1 anode during charging phase; critical for low-ESR ceramic cap placement |
| 3 - GND | Ground reference and substrate connection | Must be low-impedance node; ties reservoir capacitor C2 positive terminal in inverter config |
| 4 - CAP- | Negative terminal of bucket capacitor C1 | Connects to C1 cathode; forms charge-transfer path with CAP+ and VOUT |
| 5 - VOUT | Negative voltage output terminal | Delivers inverted output; connects to C2 negative terminal and load return |
| 6 - LV | Low-voltage regulator bypass | Ground for V+ < 3.5V to enable 1.5V operation; open above 3.5V for best efficiency |
| 7 - OSC | External oscillator/capacitor interface | Accepts 1pF–100pF capacitor to reduce fOSC; or HCMOS clock up to 400kHz |
| 8 - V+ | Positive supply input (1.5–10V) | Also serves as substrate connection; requires 0.1μF bypass capacitor close to pin |
Key Features
| Feature | Design Value |
|---|---|
| Inverting, doubling, dividing, multiplying capability | Single IC supports multiple topologies (e.g., -5V from +5V, +10V from +5V) without external diodes |
| BOOST pin for frequency scaling | Raises fOSC ~6× to reduce output ripple, shrink C1/C2, and eliminate audible switching noise |
| No external diode required | Enables full 1.5–10V operation across -40°C to +85°C without series Schottky or rectifier diodes |
| LV pin for 1.5V start-up | Allows reliable operation down to 1.5V supply by bypassing internal regulator-critical for coin-cell designs |
| 98% typical power-conversion efficiency | Minimizes thermal impact in sealed enclosures like panel meters and handheld test gear |
Applications
| Op-Amp Power Supplies | EIA/TIA-232E Power Supplies |
|---|---|
Use Scenario: Dual-supply op-amps (e.g., rail-to-rail input/output types) require symmetric ±5V from a single +5V logic rail in portable data-acquisition front-ends. IC Role / Device Role / Timing Role: MAX1044ESA+T acts as a compact, low-noise negative voltage generator with BOOST enabled to suppress 2–20kHz switching artifacts. Use Value: Eliminates need for discrete charge-pump ICs or inductive DC-DC converters-reducing BOM count and PCB area by >40%. | Use Scenario: RS-232 transceivers (e.g., MAX232 derivatives) demand ±7V to ±15V supplies from 3.3V or 5V microcontroller systems in industrial serial gateways. IC Role / Device Role / Timing Role: MAX1044ESA+T provides regulated-negative rail via cascaded or doubled configurations; LV pin grounded for stable 3.3V input operation. Use Value: Achieves EIA/TIA-232E compliance with <100mVpp ripple at 10mA load-meeting driver stage noise floor requirements. |
| Handheld Instruments | Panel Meters |
Use Scenario: Battery-powered multimeters and oscilloscope probes require isolated negative bias for analog front-end amplifiers and ADC references. IC Role / Device Role / Timing Role: MAX1044ESA+T operates from 2xAA (3V) with LV grounded, delivering -3V at 5mA; BOOST disabled to minimize quiescent current. Use Value: Extends battery life beyond 200 hours while maintaining <0.1% gain error across temperature due to low output resistance drift. | Use Scenario: DIN-rail mounted digital panel meters use +24V supply but need ±15V for precision op-amps driving 4–20mA loop transmitters. IC Role / Device Role / Timing Role: MAX1044ESA+T configured as voltage divider (VOUT = V+/2) or inverter with 10μF ceramic caps; SO-8 package fits tight 12mm board height constraints. Use Value: Enables single-board solution with no magnetic components-avoiding EMI certification delays and transformer sourcing risks. |
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 |
|---|---|---|---|
| ICL7660ESA | No BOOST pin; fixed oscillator (~10kHz typ); 1.5V min only with LV grounded | Lacks frequency-scaling capability-higher output ripple at same capacitor values; less suitable for audio-sensitive analog stages | Select when cost sensitivity outweighs ripple/noise requirements and layout space allows larger C1/C2 |
| MAX660ESA+ | Higher output current (100mA); integrated feedback for regulated output; 0.65V dropout | Supports regulated -5V at 50mA; requires external resistor divider; not pin-compatible | Select when load exceeds 15mA or regulation tighter than ±5% is required-accepts added complexity and cost |
Compared with ICL7660ESA and MAX660ESA+, the MAX1044ESA+T uniquely balances ultra-low quiescent current (200μA), BOOST-enabled ripple suppression, and true 1.5V start-up-making it optimal for portable, low-power, noise-critical inverter applications where pin compatibility with legacy ICL7660 layouts is retained.
Availability
MAX1044ESA+T is available at Aetrix Electronics and suitable for industrial instrumentation, portable test equipment, and RS-232 interface modules requiring stable component supply across extended temperature ranges.
Supply support for MAX1044ESA+T 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, 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 compact, low-noise, diode-free DC-DC conversion in space- and power-constrained systems.
FAQ
What is the minimum supply voltage for reliable startup of the MAX1044ESA+T?
The MAX1044ESA+T starts reliably at 1.5V when the LV pin is grounded-bypassing the internal regulator. At 1.5V, oscillator frequency drops to ~1kHz, and output current capability decreases proportionally. Startup behavior is verified across the full -40°C to +85°C operating range per datasheet Figure 12 and Absolute Maximum Ratings table.
Can the MAX1044ESA+T generate +10V from a +5V input?
Yes, the MAX1044ESA+T can configure as a voltage doubler to deliver ~+9.3V (accounting for diode drops in external paths) from +5V. It requires external Schottky diodes per Figure 9, as the internal switches are optimized for inversion-not direct doubling. For true regulated +10V, the MAX660ESA+ is recommended.
Does the BOOST pin on the MAX1044ESA+T affect efficiency?
Enabling BOOST on the MAX1044ESA+T raises oscillator frequency ~6×, which reduces output impedance and ripple but increases quiescent current. Efficiency remains 95–98% under load, though no-load current rises-so BOOST is recommended only when ripple or capacitor size is critical, not for maximum battery life.
Is the MAX1044ESA+T pin-compatible with the ICL7660ESA?
Yes, the MAX1044ESA+T is fully pin-compatible with the ICL7660ESA in the 8-pin SO package. Pin 1 (BOOST on MAX1044, N.C. on ICL7660) is harmless when left open; all other pins match function and electrical behavior-including identical LV, OSC, and CAP+/- assignments.
What capacitor types and values are recommended for the MAX1044ESA+T in inverter mode?
For inverter mode, use two 10μF X5R or X7R ceramic capacitors (C1 and C2) with ≤100mΩ ESR. A 0.1μF ceramic bypass capacitor (CBYPASS) is mandatory between V+ and GND. Larger values (e.g., 100μF) reduce ripple at low frequencies; smaller values (1–2.2μF) suffice for BOOST-enabled high-frequency operation.
MAX1044ESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX1044ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1044ESA+T 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+T reliable?
The price and inventory of MAX1044ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1044ESA+T is usually 5 days.
3.What payment methods are accepted for MAX1044ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1044ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1044ESA+T?
MAX1044ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1044ESA+T 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+T?
For technical support, including MAX1044ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1044ESA+T requirements.
6.How does Aetrix verify that MAX1044ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX1044ESA+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX1044ESA+T?
All MAX1044ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1044ESA+T, 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+T part is unused and in its original packaging.
Return procedure for MAX1044ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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