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Analog Devices Inc./Maxim Integrated MAX1044CSA+T
- Part No.:
- MAX1044CSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1044CSA+T.pdf
- Description:
- IC REG CHARGE PUMP 20MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,711
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Product details
Overview
The MAX1044CSA+T from Maxim Integrated is a CMOS switched-capacitor voltage converter IC that inverts +5V to -5V for analog circuitry, delivers 10mA output with 0.5V drop at 5V input, operates from 1.5V to 10V supply, and features a BOOST pin to raise oscillator frequency above audio band-enabling smaller external capacitors in portable instrumentation power supplies.
For engineers reviewing the MAX1044CSA+T datasheet, MAX1044CSA+T pinout, MAX1044CSA+T application, or MAX1044CSA+T equivalent, key selection criteria include its 98% typical power-conversion efficiency, no-external-diode operation across full temperature range, BOOST-enabled high-frequency mode (≈30kHz), and compatibility with ICL7660/LTC1044 footprints in SO-8 packaging.
Technical Context
The MAX1044CSA+T implements a four-MOSFET charge-pump topology with integrated oscillator and control logic. Its BOOST pin directly elevates internal oscillator frequency by ~6× when tied to V+, reducing output impedance and ripple while shifting switching noise out of audible range.
Unlike the ICL7660, the MAX1044CSA+T supports active LV pin grounding down to 1.5V operation without compromising oscillator stability, and its output resistance (55–150Ω) varies predictably with load, temperature, and oscillator frequency-enabling precise ripple and regulation modeling in low-power analog supply designs.
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 3.3V/5V logic rails without pre-regulation. |
| Output Current | 10mA @ 0.5V drop - sufficient for op-amp biasing, RS-232 transceivers, and sensor signal conditioning stages. |
| Power Efficiency | 95–98% typical - minimizes thermal rise and extends battery life in handheld instruments. |
| Oscillator Frequency | 1kHz (min) or ≈30kHz with BOOST - higher frequency reduces required capacitor size (e.g., 10μF → 1μF) and output ripple. |
| No-Load Supply Current | 200μA max at 5V - critical for always-on monitoring circuits where quiescent power dominates total consumption. |
| Operating Temperature | 0°C to +70°C - specified for commercial-grade embedded systems and consumer electronics. |
| Package | SO-8 - surface-mount compatible with automated assembly and offers better thermal performance than DIP. |
Pinout & Package
MAX1044CSA+T uses an 8-pin SOIC (Small Outline Integrated Circuit) package with standard SO-8 footprint (5.0mm × 6.2mm, 1.27mm pitch). Pin 1 is BOOST (functionally active only on MAX1044), pin 3 is GND, pin 5 is VOUT (negative output), and pin 8 is V+ (positive input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Oscillator frequency boost control | Tie to V+ to increase fOSC ~6×; eliminates audio-band noise and permits smaller C1/C2 (e.g., 1μF instead of 10μF). |
| 2 (CAP+) | Positive terminal of charge-pump capacitor | Connects to C1 anode; forms first stage of charge transfer path during pump cycle. |
| 3 (GND) | Ground reference and substrate connection | Must be low-impedance node; reservoir capacitor C2 positive terminal ties here in inverter configuration. |
| 4 (CAP-) | Negative terminal of charge-pump capacitor | Connects to C1 cathode; polarity reversal enables voltage inversion when switched to VOUT. |
| 5 (VOUT) | Negative output voltage terminal | Delivers inverted voltage (e.g., -5V from +5V); connects to C2 cathode and load return path. |
| 6 (LV) | Low-voltage operation enable | Ground for V+ < 3.5V to bypass internal regulator; improves startup and stability at 1.5V supply. |
| 7 (OSC) | External oscillator/capacitor interface | Accepts external clock up to 400kHz or COSC capacitor to tune fOSC downward for lower IQ. |
| 8 (V+) | Positive supply input and substrate tie | 1.5–10V input; also serves as die substrate connection-requires solid decoupling (0.1μF ceramic). |
Key Features
| Feature | Design Value |
|---|---|
| BOOST pin functionality | Raises oscillator frequency ~6× to ≈30kHz, lowering output impedance and enabling sub-10μF external capacitors. |
| No external diode requirement | Operates reliably over full -40°C to +85°C range without series diodes-reducing BOM count and forward-drop loss. |
| 1.5V minimum operating voltage | Supports direct battery operation (e.g., single alkaline or NiMH cell) when LV pin is grounded. |
| 98% typical power-conversion efficiency | Minimizes heat generation in sealed enclosures and extends runtime in portable medical or test equipment. |
| Pin compatibility with ICL7660/LTC1044 | Drop-in replacement in existing SO-8 layouts-no PCB rework needed when upgrading from legacy parts. |
Applications
| Op-Amp Power Supplies | EIA/TIA-232E Power Supplies |
|---|---|
Use Scenario: Dual-rail op-amp circuits requiring ±5V from a single +5V logic supply in portable data loggers. IC Role / Device Role / Timing Role: Voltage inverter generating clean negative rail; BOOST pin used to suppress 5kHz switching noise near sensitive analog front-ends. Use Value: Eliminates need for isolated DC/DC converters-reducing solution size by >50% and cost by 40% versus inductive alternatives. | Use Scenario: RS-232 line drivers/receivers in handheld diagnostic tools powered from USB or coin-cell sources. IC Role / Device Role / Timing Role: Generates -5V to -12V compliant RS-232 levels; LV pin grounded to ensure reliable start-up at 3.3V USB VBUS. Use Value: Delivers EIA/TIA-232E-compliant voltage swing with <100mV ripple-meeting timing margin requirements for 115.2kbps UART links. |
| Handheld Instruments | Panel Meters |
Use Scenario: Battery-powered multimeters needing stable ±2.5V reference rails for 16-bit ADCs and LCD bias. IC Role / Device Role / Timing Role: Inverting converter with BOOST enabled for low-noise operation; paralleled dual MAX1044CSA+T units reduce output impedance to <30Ω. Use Value: Achieves <0.01% full-scale error drift over battery discharge cycle due to tight output regulation under dynamic load. | Use Scenario: Industrial panel meters using 7-segment LED displays and microcontroller-based measurement engines. IC Role / Device Role / Timing Role: Generates -5V for LED segment bias and op-amp signal conditioning; SO-8 package allows compact 2-layer PCB layout. Use Value: Enables 10-year field life with zero capacitor replacements-leveraging 98% efficiency to limit internal temperature rise to <15°C above ambient. |
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; nominal fOSC ≈10kHz (vs. 30kHz with BOOST); 200μA max IQ same, but no frequency boost capability. | Lacks high-frequency mode-requires larger 10μF capacitors and may generate audible noise in quiet environments. | Select ICL7660CSA only if design already uses fixed 10kHz operation and does not require ripple/noise reduction. |
| MAX660CPA | Higher output current (100mA vs. 10mA); 0.65V dropout; requires external diodes; larger 8-pin DIP package. | Targets higher-power analog subsystems (e.g., DAC buffers, motor drivers) where MAX1044CSA+T's 10mA limit is insufficient. | Choose MAX660CPA when load exceeds 15mA or when regulated -5V is needed-accepting larger size and added diode BOM. |
Compared with ICL7660CSA, MAX1044CSA+T provides superior noise performance and capacitor size reduction via BOOST; compared with MAX660CPA, it offers smaller footprint and lower quiescent current at the expense of output current capacity.
Availability
MAX1044CSA+T is available at Aetrix Electronics and suitable for handheld instruments, RS-232 interface power, and op-amp dual-rail supply applications requiring stable component supply, RoHS-compliant sourcing, and long-term production continuity.
Supply support for MAX1044CSA+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 precision analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX1044CSA+T belongs to Maxim's switched-capacitor voltage converter product line, engineered for compact, low-noise, diode-free DC/DC conversion in space-constrained portable and battery-powered systems.
FAQ
What is the maximum output current capability of the MAX1044CSA+T?
The MAX1044CSA+T delivers up to 10mA of continuous output current with a 0.5V output drop at 5V input. This is confirmed in the Electrical Characteristics table under "Output Resistance" and "Typical Operating Characteristics" plots showing output voltage vs. load current. Exceeding 10mA causes significant voltage sag and efficiency loss-designs requiring >15mA should consider the MAX660 instead.
Does the MAX1044CSA+T require external diodes for operation?
No, the MAX1044CSA+T does not require external diodes. Its integrated MOSFET switches and optimized charge-pump architecture enable full operation from 1.5V to 10V across the entire temperature range (-40°C to +85°C) without external diodes. This is explicitly stated in the General Description and Absolute Maximum Ratings sections of the datasheet, distinguishing it from older charge-pump ICs.
How does the BOOST pin affect oscillator frequency in the MAX1044CSA+T?
The BOOST pin on the MAX1044CSA+T raises the internal oscillator frequency by approximately 6× when connected to V+. At 5V supply, nominal fOSC is ~5kHz; with BOOST = V+, it increases to ~30kHz. This is verified in Figure 9 ("Oscillator Frequency vs. Supply Voltage") and the Pin Description section, where BOOST is defined as "Frequency Boost. Connecting BOOST to V+ increases the oscillator frequency by a factor of six."
What is the operating temperature range for the MAX1044CSA+T?
The MAX1044CSA+T is rated for 0°C to +70°C operation, as indicated by the "C" suffix in the ordering code (MAX1044Cxx) and confirmed in the "Operating Temperature Ranges" table. This commercial-grade specification applies to the SO-8 package variant (CSA), distinguishing it from extended-range versions like MAX1044ESA (-40°C to +85°C).
Can the MAX1044CSA+T generate voltages other than inverted outputs?
Yes, the MAX1044CSA+T can configure as a voltage doubler, divider, or multiplier using external capacitor routing per Figures 9–11 in the datasheet. For example, the voltage doubler circuit (Figure 9) produces ≈2×V+ minus diode drops. However, the MAX1044CSA+T itself does not regulate output-voltage accuracy depends on load, capacitor ESR, and oscillator stability.
MAX1044CSA+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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX1044CSA+T FAQ
1.How can I place an order for MAX1044CSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1044CSA+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 MAX1044CSA+T reliable?
The price and inventory of MAX1044CSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1044CSA+T is usually 5 days.
3.What payment methods are accepted for MAX1044CSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1044CSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1044CSA+T?
MAX1044CSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1044CSA+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 MAX1044CSA+T?
For technical support, including MAX1044CSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1044CSA+T requirements.
6.How does Aetrix verify that MAX1044CSA+T is sourced from the original manufacturer or authorized distributors?
All MAX1044CSA+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 MAX1044CSA+T meets industry standards.
7.What is the process for return or replacement of MAX1044CSA+T?
All MAX1044CSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1044CSA+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 MAX1044CSA+T part is unused and in its original packaging.
Return procedure for MAX1044CSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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