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Analog Devices Inc./Maxim Integrated MAX829EUK
- Part No.:
- MAX829EUK
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX829EUK.pdf
- Description:
- IC REG CHARG PUMP INV 25MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,769
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Product details
Overview
MAX829EUK from Maxim Integrated is a monolithic CMOS switched-capacitor voltage inverter IC that generates a regulated negative output from a positive input supply. It operates at 35kHz, supports +1.5V to +5.5V input, delivers up to 25mA output current with ≤500mV voltage drop at full load, and achieves ≥94% conversion efficiency across its operating range - ideal for generating -5V from +5V logic rails in portable analog signal chains.
For engineers reviewing the MAX829EUK datasheet, MAX829EUK pinout, MAX829EUK application, or MAX829EUK equivalent, this device is selected for low-quiescent-current, space-constrained DC-DC inversion where SOT23-5 footprint, capacitor-only external components, and guaranteed -40°C to +85°C operation are critical.
Technical Context
The MAX829EUK implements a two-phase charge-pump topology using on-chip power MOSFET switches (S1–S4) to invert VIN without inductors. Its fixed 35kHz oscillator frequency enables predictable ripple and output impedance behavior across temperature and load.
Unlike regulated converters, it functions as an unregulated inverting source with output resistance (~20Ω at +25°C, VIN = +5V) dominating droop under load; VOUT = –(VIN – IOUT × RS–), where RS– includes switch RDS(on), capacitor ESR, and pump frequency-dependent impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 35kHz typical - sets switching period (28.6µs), directly determines output ripple frequency and minimum effective flying capacitance. |
| Input Voltage Range | +1.5V to +5.5V - supports single-cell Li-ion, 3.3V logic, and 5V legacy systems without external regulation. |
| Output Current | 25mA maximum - sufficient for op-amp biasing, sensor interfaces, and small LCD bias supplies. |
| Voltage Drop at 25mA | ≤500mV - defines worst-case output deviation: e.g., -4.5V output when inverting +5V at full load. |
| Conversion Efficiency | ≥94% at TA = -40°C to +85°C - ensures minimal power loss and thermal rise in battery-powered devices. |
| Quiescent Supply Current | 115µA typical at +25°C - enables >10-year battery life in always-on instrumentation with µA-level standby draw. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and automotive cabin applications without derating. |
Pinout & Package
MAX829EUK is housed in a 5-pin SOT23-5 package (top mark AABJ), with exposed pad not connected internally. Package dimensions: 2.9mm × 1.6mm × 1.1mm, compatible with standard SMT reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Inverting charge-pump output | Delivers negative voltage; connects to reservoir capacitor C2 and load; output impedance dominates load regulation. |
| 2 - IN | Positive power-supply input | Accepts +1.5V to +5.5V; also serves as substrate connection; requires local 0.1µF bypass if loaded from IN-to-OUT. |
| 3 - C1- | Flying capacitor negative terminal | AC-coupled node; alternately charged/discharged by internal switches; must use low-ESR ceramic capacitor (3.3µF typical). |
| 4 - C1+ | Flying capacitor positive terminal | AC-coupled node; phase-complementary to C1-; forms charge-transfer path with internal S1–S4 switch matrix. |
| 5 - GND | Analog ground reference | Return path for all internal switches and external capacitors; must be low-impedance plane to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-only design | Requires only two external capacitors (C1 flying, C2 reservoir) - eliminates inductors, simplifies layout, reduces EMI. |
| High-frequency operation | 35kHz oscillator enables smaller flying capacitors (3.3µF vs. 10µF for MAX828) and lower output impedance at same load. |
| Low-noise inverted output | Typical output ripple <100mVp-p at 5mA with 3.3µF/low-ESR caps - suitable for precision analog front-ends without post-regulation. |
| Wide input compatibility | +1.5V min input enables direct use with single alkaline or LiFePO₄ cells - no pre-regulator needed for low-voltage systems. |
| Thermally robust SOT23-5 | 571mW power dissipation at +70°C ambient - supports 25mA loads at full temperature range without heatsinking. |
Applications
| Small LCD Panels | Medical Instruments |
|---|---|
Use Scenario: Providing negative bias voltage for STN or segment LCD contrast control in handheld diagnostic tools. IC Role / Device Role / Timing Role: Inverting charge-pump voltage converter generating stable -3V to -5V from main 3.3V system rail. Use Value: Eliminates need for discrete inductor-based inverters; 25mA output supports multi-segment displays with <500mV droop at full brightness. |
Use Scenario: Powering rail-to-rail op-amps and ADC reference buffers in portable ECG or pulse oximeter front-ends. IC Role / Device Role / Timing Role: Low-noise negative supply generator ensuring analog signal integrity in battery-operated medical sensors. Use Value: 115µA quiescent current extends single-AA battery life beyond 5 years in sleep mode; 94% efficiency minimizes self-heating near patient contact zones. |
| Cell Phones | Battery-Operated Equipment |
Use Scenario: Generating -2.5V for RF front-end LNA bias in legacy 2G/3G handset designs. IC Role / Device Role / Timing Role: Compact inverting DC-DC converter placed adjacent to RF module to minimize trace length and noise coupling. Use Value: SOT23-5 footprint saves PCB area; 35kHz switching avoids interference with GSM receive bands; low ESR cap support reduces conducted emissions. |
Use Scenario: Creating dual-rail ±5V supplies for portable data loggers using single 9V alkaline battery. IC Role / Device Role / Timing Role: Primary negative rail generator cascaded with linear regulator to clean output for microcontroller ADC reference. Use Value: +1.5V minimum input allows operation down to 6V battery voltage; guaranteed -40°C to +85°C rating ensures field reliability in outdoor deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX828EUK | 12kHz oscillator, 60µA IQ, requires 10µF flying capacitor | Lower switching noise but higher output impedance and larger external caps | Select for ultra-low-noise analog systems where ripple <50mVp-p is mandatory and board space permits larger caps. |
| MAX860ESA+ | Higher 50mA output, 600mV drop, µMAX-8 package | Supports heavier loads but occupies larger footprint and draws more quiescent current (250µA) | Select when >25mA load current is required and SOT23-5 size constraint is relaxed for improved thermal performance. |
Compared with MAX828EUK and MAX860ESA+, the MAX829EUK offers optimal balance of high-frequency response, compact SOT23-5 size, and low-IQ operation - making it preferred for space-limited, battery-sensitive applications needing 20–25mA inverted rails.
Availability
MAX829EUK is available at Aetrix Electronics and suitable for small LCD panels, medical instruments, cell phones, and battery-operated equipment requiring stable component supply across industrial temperature ranges.
Supply support for MAX829EUK 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 systems.
The MAX828/MAX829 product line delivers ultra-small, capacitor-based voltage inverters optimized for low-power, space-constrained portable electronics requiring clean negative rails without inductors.
FAQ
What is the guaranteed oscillator frequency tolerance for MAX829EUK over temperature?
The MAX829EUK oscillator frequency is specified as 19kHz to 54.3kHz over the full -40°C to +85°C range, with 35kHz typical at +25°C. This variation is inherent to the RC-based oscillator design and must be accounted for in ripple filtering and EMI compliance testing. The MAX829EUK datasheet guarantees these bounds via design simulation and characterization - no binning or test screening is applied.
Can MAX829EUK generate a regulated -5V output from a +5V input?
No - the MAX829EUK is an unregulated charge-pump inverter. With +5V input and 25mA load, its output typically drops to -4.5V due to internal switch resistance and capacitor ESR. To achieve stable -5V, a low-dropout linear regulator (e.g., MAX1725) must follow the MAX829EUK output. The MAX829EUK itself provides only the inverted rail; regulation is external.
What is the recommended flying capacitor value and type for MAX829EUK?
The MAX829EUK datasheet specifies 3.3µF for the flying capacitor (C1), using low-ESR ceramic types such as X7R or X5R in 0805 or 0603 packages. AVX, Murata, and TDK offer compliant parts. Larger values reduce output resistance but yield diminishing returns beyond 10µF; smaller values increase ripple and droop. Electrolytic or tantalum capacitors are not recommended due to high ESR.
Does MAX829EUK include thermal shutdown or overcurrent protection?
No - the MAX829EUK has no internal thermal shutdown or output current limiting. Its absolute maximum output current is 50mA, but continuous operation above 25mA risks exceeding the 571mW power dissipation limit in SOT23-5 at elevated ambient temperatures. System-level protection (e.g., series resistor or external current limiter) is required for sustained >25mA loads.
Is MAX829EUK pin-compatible with MAX828EUK?
Yes - MAX829EUK and MAX828EUK share identical SOT23-5 pinout, package dimensions, and terminal functions. They are functionally interchangeable at the board level; substitution only requires verifying that the higher 35kHz switching frequency of MAX829EUK does not conflict with system EMI requirements or capacitor selection (3.3µF vs. 10µF).
MAX829EUK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Bulk
- 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):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 25mA
- Frequency - Switching:
- 35kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-TSOP
MAX829EUK FAQ
1.How can I place an order for MAX829EUK through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX829EUK 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 MAX829EUK reliable?
The price and inventory of MAX829EUK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX829EUK is usually 5 days.
3.What payment methods are accepted for MAX829EUK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX829EUK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX829EUK?
MAX829EUK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX829EUK 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 MAX829EUK?
For technical support, including MAX829EUK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX829EUK requirements.
6.How does Aetrix verify that MAX829EUK is sourced from the original manufacturer or authorized distributors?
All MAX829EUK 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 MAX829EUK meets industry standards.
7.What is the process for return or replacement of MAX829EUK?
All MAX829EUK units undergo pre-shipment inspection (PSI). If there is an issue with MAX829EUK, 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 MAX829EUK part is unused and in its original packaging.
Return procedure for MAX829EUK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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