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Analog Devices Inc./Maxim Integrated MAX1044CSA+
- Part No.:
- MAX1044CSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1044CSA+.pdf
- Description:
- IC REG CHARGE PUMP 20MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,448
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Product details
Overview
MAX1044CSA+ from Maxim Integrated is a monolithic CMOS switched-capacitor voltage converter that inverts +5V to -5V for analog circuitry power, delivers 10mA output with 0.5V drop at 5V input, operates from 1.5V to 10V supply, and features a BOOST pin enabling oscillator frequency increase by ~6× to reduce capacitor size and shift noise out of audio band.
For engineers reviewing the MAX1044CSA+ datasheet, MAX1044CSA+ pinout, MAX1044CSA+ application, or MAX1044CSA+ equivalent, this page provides verified pin functions, confirmed inverting/doubling/dividing/multiplying capability, BOOST-enabled high-frequency operation, no-external-diode operation across full temperature range, and real-world efficiency (98% typical) and quiescent current (200μA max at 5V).
Technical Context
The MAX1044CSA+ integrates four on-chip power MOSFET switches, oscillator control circuitry, and internal regulator bypass logic via the LV pin. Its charge-pump architecture synthesizes an equivalent output resistance inversely proportional to oscillator frequency and capacitor value (REQ ≈ 1/(fOSC/2 × C1)).
BOOST pin connection to V+ raises fOSC from ~1kHz to ~6kHz, directly lowering output impedance, ripple, and required external capacitor values. LV pin grounding enables stable 1.5V operation and improves low-voltage performance but increases quiescent current above 5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 10.0V - supports battery-powered and logic-supply-derived operation without external diodes. |
| Output Current Capability | 10mA with 0.5V drop at 5V input - sufficient for op-amp biasing and RS-232 transceivers. |
| Oscillator Frequency | ~1kHz (BOOST open), ~6kHz (BOOST = V+) - adjustable to optimize ripple, efficiency, and capacitor size. |
| Power Conversion Efficiency | 98% typical at 5V/5mA - minimizes thermal load and extends battery life in portable systems. |
| No-Load Supply Current | 200μA maximum at 5V - enables ultra-low-power standby in handheld instruments. |
| Output Resistance | 65Ω typical at 25°C, 5kHz - determines load regulation; reduced by BOOST or paralleling devices. |
| Operating Temperature | 0°C to +70°C - commercial-grade rating suitable for consumer and industrial embedded applications. |
Pinout & Package
MAX1044CSA+ uses an 8-pin SO (Small Outline) package with 150mil width, RoHS-compliant, surface-mount compatible footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Oscillator frequency control | Connect to V+ to raise fOSC ~6×; left open for nominal operation; no effect when OSC driven externally. |
| 2 - CAP+ | Bucket capacitor positive terminal | Connects to positive side of charge-pump capacitor C1; critical path for charge transfer timing and EMI control. |
| 3 - GND | Ground reference and substrate connection | Common return for V+, VOUT, and internal circuitry; must be low-impedance for stable regulation. |
| 4 - CAP- | Bucket capacitor negative terminal | Connects to negative side of C1; forms switching node with CAP+ during charge/discharge cycles. |
| 5 - VOUT | Negative voltage output | Delivers inverted output (e.g., -5V from +5V); connects to reservoir capacitor C2 negative terminal. |
| 6 - LV | Low-voltage regulator bypass | Ground for operation down to 1.5V; improves startup and stability below 3.5V; optional above 5V. |
| 7 - OSC | Oscillator control input | Accepts external capacitor to lower fOSC or external clock up to 400kHz; sensitive to stray capacitance. |
| 8 - V+ | Positive supply input and substrate tie | 1.5V–10V input; also serves as IC substrate connection - must be decoupled with 0.1μF bypass capacitor. |
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 or inductors. |
| BOOST pin for frequency scaling | Enables 6× oscillator boost to reduce output ripple, shrink 10μF capacitors, and eliminate audible switching noise. |
| No external diode required | Full 1.5V–10V operation over -40°C to +85°C without series diode - simplifies BOM and improves reliability. |
| 1.5V minimum operating voltage | LV pin grounding allows functional operation from single-cell Li-ion or alkaline batteries (1.5V fresh). |
| 98% typical power-conversion efficiency | Minimizes heat generation and extends runtime in space-constrained portable instrumentation. |
Applications
| EIA/TIA-232E Power Supply | Op-Amp Biasing |
|---|---|
Use Scenario: Generating ±5V rails from a single +5V logic supply in RS-232 line drivers/receivers. IC Role / Device Role / Timing Role: Voltage inverter providing clean -5V output for RS-232 driver stage biasing. Use Value: Eliminates need for dual-output DC/DC converters; achieves <10mVp-p ripple at 10mA with BOOST-enabled 6kHz operation. | Use Scenario: Powering rail-to-rail op-amps in handheld test equipment requiring bipolar analog supplies. IC Role / Device Role / Timing Role: Negative rail generator delivering stable -5V at ≤200μA quiescent current for low-power signal conditioning. Use Value: Enables true bipolar operation with <0.5V output drop at 10mA, preserving dynamic range in precision amplifiers. |
| Portable Telephone Audio Stage | Panel Meter Reference Supply |
Use Scenario: Providing isolated negative bias for microphone preamplifier stages in battery-operated telephony modules. IC Role / Device Role / Timing Role: Low-noise inverter supplying -3V to -5V for analog front-end biasing. Use Value: BOOST pin shifts switching frequency above 20kHz, preventing audible artifacts in audio signal paths. | Use Scenario: Generating stable negative reference voltage for 3½-digit LCD panel meters powered from +5V USB or wall adapter. IC Role / Device Role / Timing Role: Precision inverter delivering regulated -5V output with <1% load regulation over 0–10mA. Use Value: Maintains ADC reference integrity under varying display backlight loads due to low 65Ω output resistance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICL7660CSA | No BOOST pin; fixed ~10kHz oscillator; identical pinout and 1.5V–10V range. | Lacks BOOST-driven ripple/noise reduction; less suitable for audio-sensitive or space-constrained designs. | Select ICL7660CSA only if BOOST functionality is unnecessary and cost sensitivity outweighs ripple/size advantages. |
| MAX660ESA+ | Higher output current (100mA), <0.65V drop, integrated oscillator; different pinout and package (8-SO). | Designed for higher-power analog rails; not pin-compatible; requires layout change and larger capacitors. | Choose MAX660ESA+ when >10mA load current or tighter regulation is required - not a drop-in replacement. |
Compared with ICL7660CSA, MAX1044CSA+ offers superior ripple suppression and capacitor size reduction via BOOST; compared with MAX660ESA+, it provides lower quiescent current and smaller solution footprint at the expense of output current capability.
Availability
MAX1044CSA+ is available at Aetrix Electronics and suitable for EIA/TIA-232E power supplies, op-amp biasing circuits, and portable telephone audio stages requiring stable component supply, RoHS compliance, and commercial-temperature-grade reliability.
Supply support for MAX1044CSA+ 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 compact, inductorless DC/DC conversion in space- and cost-sensitive portable and embedded systems.
FAQ
What is the function of the BOOST pin on the MAX1044CSA+?
The BOOST pin on the MAX1044CSA+ raises the internal oscillator frequency by approximately six times when connected to V+. This reduces output ripple, lowers effective output resistance, shrinks required external capacitor values (e.g., from 10μF to ~1.5μF), and shifts switching noise above the audible band. When left open, the MAX1044CSA+ operates at its nominal ~1kHz oscillator frequency. The BOOST pin has no effect when the OSC pin is driven by an external clock.
Can the MAX1044CSA+ generate voltages other than inverted outputs?
Yes, the MAX1044CSA+ supports multiple configurations beyond inversion: it can double (+10V from +5V), divide (e.g., +2.5V from +5V), or multiply input voltage using appropriate external capacitor arrangements. These modes rely on the same internal charge-pump architecture and require no additional components beyond standard pump/reservoir capacitors. The MAX1044CSA+ datasheet provides verified schematics for each topology, all operating within the 1.5V–10V input range without external diodes.
What is the minimum supply voltage for reliable operation of the MAX1044CSA+?
The MAX1044CSA+ operates reliably down to 1.5V when the LV pin is grounded - a feature confirmed in the datasheet's Electrical Characteristics table and Operating Temperature Ranges section. At 1.5V input, the device delivers usable inverted output with reduced current capability and higher output resistance. Leaving LV open restricts operation to ≥3.5V per the ICL7660 compatibility specification. For single-cell battery applications, grounding LV is mandatory to achieve full 1.5V functionality in the MAX1044CSA+.
How does the MAX1044CSA+ compare to the ICL7660CSA in terms of efficiency and quiescent current?
The MAX1044CSA+ and ICL7660CSA deliver nearly identical efficiency (95–98% typical) and no-load supply current (200μA max at 5V). However, the MAX1044CSA+ achieves lower output resistance and ripple under load due to BOOST-enabled higher oscillator frequency, improving effective efficiency at 5–10mA output. Both parts share the same 1.5V–10V range and pinout, but only the MAX1044CSA+ offers the BOOST feature for dynamic optimization of size, noise, and regulation.
Is the MAX1044CSA+ pin-compatible with the LTC1044?
Yes, the MAX1044CSA+ is explicitly stated in its General Description to be pin compatible with the LTC1044 and ICL7660. All three devices use identical 8-pin SO, DIP, and μMAX footprints, with matching pin assignments for V+, GND, CAP+, CAP-, VOUT, OSC, LV, and BOOST/N.C. This allows direct substitution in existing designs targeting the LTC1044, provided the BOOST pin is left unconnected or tied appropriately - no PCB changes are required for replacement.
MAX1044CSA+ 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX1044CSA+ FAQ
1.How can I place an order for MAX1044CSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1044CSA+ 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 MAX1044CSA+ reliable?
The price and inventory of MAX1044CSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1044CSA+ is usually 5 days.
3.What payment methods are accepted for MAX1044CSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1044CSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1044CSA+?
MAX1044CSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1044CSA+ 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 MAX1044CSA+?
For technical support, including MAX1044CSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1044CSA+ requirements.
6.How does Aetrix verify that MAX1044CSA+ is sourced from the original manufacturer or authorized distributors?
All MAX1044CSA+ 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 MAX1044CSA+ meets industry standards.
7.What is the process for return or replacement of MAX1044CSA+?
All MAX1044CSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1044CSA+, 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 MAX1044CSA+ part is unused and in its original packaging.
Return procedure for MAX1044CSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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