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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:2,031
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Product details
Overview
The MAX1044ESA 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 MAX1044ESA datasheet, MAX1044ESA pinout, MAX1044ESA application, or MAX1044ESA equivalent, key selection factors 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 footprints in SO-8 package.
Technical Context
The MAX1044ESA integrates four on-chip power MOSFET switches, oscillator control circuitry, and an internal regulator with LV pin bypass capability. It implements charge-pump topology using external bucket (C1) and reservoir (C2) capacitors to synthesize negative or doubled output voltages without inductors.
Oscillator frequency is internally generated (1kHz typ. at V+ = 2V; 5kHz typ. at V+ = 5V), adjustable via BOOST pin (×6 increase when tied to V+) or external capacitor on OSC pin (1pF–100nF range). Output voltage is unregulated and load-dependent, with output resistance inversely proportional to fOSC and C1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 10.0V - supports single-cell Li-ion, 3.3V/5V logic rails, and legacy +5V systems without level-shifting. |
| Output Current | 10mA - sufficient for biasing dual op-amps, RS-232 transceivers, or low-power analog front-ends. |
| Output Voltage Drop | 0.5V at 10mA - defines minimum input-to-output headroom; e.g., -4.5V out from +5V in under load. |
| Power Efficiency | 98% typical at RL = 5kΩ - minimizes thermal rise and extends battery life in portable instruments. |
| No-Load Supply Current | 200μA max at 5V - enables ultra-low-quiescent operation in always-on monitoring circuits. |
| Oscillator Frequency | 1kHz (min) to ~30kHz (with BOOST) - audio-band avoidance reduces audible noise in handheld devices. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and automotive cabin applications requiring extended thermal range. |
Pinout & Package
MAX1044ESA is housed in an 8-pin SO (Small Outline) package, 150 mil width, RoHS-compliant, with standard SOIC-8 footprint and thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Oscillator frequency boost control | Tie to V+ to increase fOSC ×6; eliminates audio-band switching noise and permits smaller C1/C2 (e.g., 1μF instead of 10μF). |
| 2 (CAP+) | Positive terminal of bucket capacitor | Connects to C1 anode during charging phase; routing must minimize loop inductance to reduce EMI. |
| 3 (GND) | Ground reference and substrate connection | Shared return for V+, VOUT, and internal switches; requires low-impedance PCB plane for stable operation. |
| 4 (CAP-) | Negative terminal of bucket capacitor | Connects to C1 cathode; polarity reversal during pump cycle mandates correct capacitor orientation. |
| 5 (VOUT) | Negative output voltage node | Delivers inverted voltage (e.g., -5V); must remain ≤ GND to avoid reverse-biasing internal protection diodes. |
| 6 (LV) | Low-voltage regulator bypass | Ground for V+ < 3.5V to enable sub-2V operation; open for V+ > 3.5V to optimize efficiency at higher rails. |
| 7 (OSC) | External oscillator/capacitor interface | Accepts 1pF–100nF capacitor to lower fOSC; also accepts external clock up to 400kHz for synchronization. |
| 8 (V+) | Positive supply input and substrate tie | Supplies all internal circuitry; also serves as IC substrate connection-must be decoupled with 0.1μF ceramic near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting/doubling/dividing/multiplying topology | Single IC replaces discrete charge-pump designs for ±5V, +10V, or +2.5V generation-reducing BOM count and board area. |
| BOOST pin for frequency scaling | Enables 30kHz operation without external clock, lowering output impedance by ~6× and ripple by >50% vs. base mode. |
| No external diode required | Eliminates Schottky diode cost and forward-drop loss across full -40°C to +85°C range-simplifies layout and improves reliability. |
| 1.5V minimum operating voltage | Supports direct connection to single alkaline or NiMH cells, enabling true single-supply analog subsystems in handheld meters. |
| Pin-compatible with ICL7660/LTC1044 | Allows drop-in replacement in existing designs using SO-8 footprint-no PCB rework needed for performance upgrade. |
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 rails from a single +5V source in portable test equipment. IC Role / Device Role / Timing Role: MAX1044ESA acts as a compact, inductorless negative rail generator-providing regulated -5V output referenced to system ground. Use Value: Enables high-precision analog signal conditioning without magnetic components, reducing EMI susceptibility and board space by >40% vs. inductive DC/DC. | Use Scenario: RS-232 line drivers need ±5V to ±15V voltage levels for compliant driver output swing in industrial PLC interfaces. IC Role / Device Role / Timing Role: MAX1044ESA generates -5V from +5V logic supply to meet EIA/TIA-232E receiver input common-mode range requirements. Use Value: Meets TIA-232E spec with <10mA load current and <100mV ripple-eliminating need for separate isolated DC/DC or transformer-based solutions. |
| Handheld Instruments | Panel Meters |
Use Scenario: Battery-powered multimeters and data loggers use +3.3V microcontrollers but require -3.3V for LCD bias or precision ADC reference buffers. IC Role / Device Role / Timing Role: MAX1044ESA provides low-noise, low-quiescent -3.3V rail from main 3.3V supply-leveraging BOOST pin for silent operation. Use Value: Achieves <20μA total system quiescent current in sleep mode while maintaining fast wake-up response-extending AA battery life to >12 months. | Use Scenario: Industrial panel meters with 4–20mA loop-powered design need isolated negative supply for signal conditioning op-amps without violating loop compliance. IC Role / Device Role / Timing Role: MAX1044ESA generates local -5V rail from loop-derived +5V, operating within strict 3.5mA loop budget via LV pin optimization. Use Value: Delivers stable -5V at 5mA with <0.1% line regulation-enabling 16-bit ADC accuracy without external LDO post-regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICL7660ESA | No BOOST pin; fixed oscillator (~10kHz typ.); identical pinout and SO-8 package. | Lacks high-frequency mode-requires larger C1/C2 (10μF) for same ripple; less suitable for audio-sensitive handhelds. | Select ICL7660ESA only if BOOST functionality is unnecessary and cost is primary constraint. |
| MAX660ESA | Higher output current (100mA); integrated LDO post-regulator; different pinout (8-pin SO, non-pin-compatible). | Supports heavier loads (e.g., multiple op-amps, RS-232 drivers) but needs PCB redesign and adds $0.30 BOM cost. | Choose MAX660ESA when >20mA load current or regulated output is required-otherwise MAX1044ESA offers optimal size/power trade-off. |
Compared with ICL7660ESA, MAX1044ESA adds BOOST-driven frequency scaling for lower ripple and smaller capacitors; compared with MAX660ESA, it trades output current and regulation for pin compatibility, lower quiescent current (200μA vs. 160μA), and simpler external component count.
Availability
MAX1044ESA is available at Aetrix Electronics and suitable for industrial instrumentation, RS-232 interface design, and handheld test equipment requiring stable component supply across extended 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, medical, and communications applications.
The MAX1044 belongs to Maxim's switched-capacitor voltage converter product line, engineered for low-noise, inductorless DC/DC conversion in space-constrained, battery-operated systems where EMI and component count are critical.
FAQ
What is the maximum output current capability of the MAX1044ESA?
The MAX1044ESA delivers up to 10mA of continuous output current with a 0.5V drop at V+ = 5V. This is verified per Electrical Characteristics table (TA = +25°C, RL = ∞, LV open). Higher loads increase output resistance and voltage droop; for >20mA, consider the MAX660ESA instead. The MAX1044ESA's 10mA rating assumes proper capacitor sizing (e.g., 10μF C1/C2) and BOOST pin left open or configured per application needs.
Can the MAX1044ESA generate a positive doubled voltage like +10V from +5V?
Yes, the MAX1044ESA supports voltage doubling in addition to inversion. As shown in Figure 9 of the datasheet, connecting CAP+ to V+, CAP- to VOUT, and VOUT to the positive reservoir capacitor enables +2(V+) − 2VD output. Using Schottky diodes reduces VD, achieving ~+9.4V from +5V. Note that output current and regulation degrade versus inverting mode due to added diode losses and shared switch resistance.
How does the BOOST pin affect oscillator frequency and output performance of the MAX1044ESA?
Tying the BOOST pin to V+ increases the MAX1044ESA's oscillator frequency by approximately six times-e.g., from ~5kHz to ~30kHz at V+ = 5V. This reduces output impedance (~6×), cuts output ripple by >50%, allows smaller external capacitors (1μF instead of 10μF), and shifts switching noise above 20kHz to eliminate audible artifacts. The BOOST function is exclusive to MAX1044ESA and not available on ICL7660ESA.
Is the MAX1044ESA pin-compatible with the ICL7660ESA in SO-8 package?
Yes, the MAX1044ESA and ICL7660ESA share identical SO-8 pinout, footprint, and electrical specifications except for the BOOST pin (pin 1), which is N.C. on ICL7660ESA. This enables direct drop-in replacement in existing ICL7660-based designs. When substituting, leave BOOST open on MAX1044ESA to match ICL7660 behavior-or connect it to V+ to unlock higher-frequency operation without layout changes.
What is the recommended capacitor type and value for stable operation of the MAX1044ESA?
For standard inverting operation (e.g., +5V to -5V), use two 10μF ceramic or tantalum capacitors rated ≥10V for C1 (bucket) and C2 (reservoir), plus a 0.1μF ceramic bypass capacitor between V+ and GND. Ceramic X7R or X5R dielectrics are preferred for low ESR and stable capacitance over temperature. Larger values (e.g., 100μF) improve ripple and load regulation but increase start-up time and board area.
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:
- 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:
- 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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