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Analog Devices Inc./Maxim Integrated MAX828EUK+T
- Part No.:
- MAX828EUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX828EUK+T.pdf
- Description:
- IC REG CHARGE PUMP 25MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:336
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Product details
Overview
MAX828EUK+T 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 12kHz, delivers up to 25mA output current with ≤500mV voltage drop at full load, and achieves >95% voltage conversion efficiency across light-to-moderate loads. It is used to generate -5V from +5V logic supplies for analog circuitry in space-constrained portable systems.
For engineers reviewing the MAX828EUK+T datasheet, MAX828EUK+T pinout, MAX828EUK+T application, or MAX828EUK+T equivalent, key selection criteria include its 60µA quiescent current, SOT23-5 package footprint, 1.5V–5.5V input range, and requirement for only two external capacitors - critical for battery-powered instrumentation and LCD biasing.
Technical Context
The MAX828EUK+T implements a two-phase charge-pump topology using four on-chip power MOSFET switches and an integrated oscillator. Its fixed 12kHz switching frequency balances low EMI against capacitor size trade-offs, and its output impedance (~20Ω at VIN = 5V, TA = +25°C) directly determines load regulation performance.
Unlike regulated DC/DC converters, it provides unregulated inverted output: VOUT ≈ –(VIN – IOUT × RS–), where RS– is dominated by internal switch resistance and external capacitor ESR. Efficiency exceeds 94% at 5mA and remains >90% up to 20mA, making it suitable for low-noise analog rails where precision regulation is secondary to ultra-low IQ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +1.5V to +5.5V - supports single-cell Li-ion, 3.3V logic, and 5V legacy rails without external LDO pre-regulation. |
| Output Current | 25mA - sufficient to power op-amp bias networks, small LCD segment drivers, or sensor signal conditioning stages. |
| Quiescent Current | 60µA - enables multi-year operation from coin cells in medical handhelds or remote sensors. |
| Voltage Conversion Efficiency | ≥95% at light loads - minimizes heat generation and extends battery life in always-on portable devices. |
| Oscillator Frequency | 12kHz (typ) - reduces EMI sensitivity and allows use of low-cost, high-capacitance ceramic or tantalum flying capacitors. |
| Output Resistance | ~20Ω at VIN = 5V - defines worst-case voltage droop: e.g., 500mV drop at 25mA load, enabling predictable rail design. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive cabin-temperature environments. |
Pinout & Package
SOT23-5 surface-mount package (5-pin, 1.6mm × 2.9mm footprint), moisture-sensitive level 1, RoHS-compliant, top-mark "AABI".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Inverting charge-pump output | Delivers negative voltage rail; connects to reservoir capacitor C2 and load; requires local bypassing for ripple suppression. |
| 2 - IN | Positive power-supply input | Accepts 1.5V–5.5V input; must be bypassed with ≥0.1µF capacitor to suppress switching transients and stabilize pump operation. |
| 3 - C1– | Flying capacitor negative terminal | Completes charge-transfer path during phase 2; connects directly to negative plate of flying capacitor C1. |
| 4 - C1+ | Flying capacitor positive terminal | Connects to positive plate of flying capacitor C1; forms pumping node with C1– and internal switches S1–S4. |
| 5 - GND | Analog/digital ground reference | Common return for IN, OUT, and flying capacitor; must be tied to low-impedance ground plane to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 60µA enables >10-year battery life in intermittent-sampling medical instruments using CR2032 cells. |
| Two-capacitor operation | Only C1 (flying) and C2 (reservoir) required - eliminates inductors and simplifies layout for PCB area-constrained PDAs. |
| High-efficiency inversion | 95% conversion efficiency at 5mA reduces thermal stress in sealed enclosures like handheld terminals. |
| Wide input voltage support | 1.5V minimum start-up allows direct connection to single alkaline or NiMH cells without boost pre-regulator. |
| SOT23-5 compact packaging | 1.6mm × 2.9mm footprint saves >60% board area vs. SO-8 alternatives - critical for wearable sensor modules. |
Applications
| Medical Handheld Instruments | Small LCD Panel Biasing |
|---|---|
|
Use Scenario: Portable blood glucose meters and pulse oximeters requiring isolated negative analog supply for ADC reference and op-amp biasing. IC Role / Device Role / Timing Role: Voltage inverter generating stable –2.5V rail from 3.3V MCU supply to power precision analog front-end. Use Value: 60µA IQ extends single-CR2032 battery life beyond 3 years in standby mode while maintaining <500mV output droop at 15mA peak load. |
Use Scenario: Monochrome STN or segment LCD displays in industrial HMIs and barcode scanners needing –15V to –20V bias voltage. IC Role / Device Role / Timing Role: Cascaded MAX828EUK+T units generate doubled negative voltage (e.g., –2 × VIN) for LCD common-electrode drive. Use Value: Fixed 12kHz frequency ensures predictable capacitor sizing and low EMI in proximity to touch-sensitive overlay layers. |
| Cell Phone Peripheral Modules | Battery-Operated Test Equipment |
|
Use Scenario: RF front-end calibration circuits and audio codec biasing in feature-phone add-on modules powered by shared 3.6V battery rail. IC Role / Device Role / Timing Role: Inverter supplying –3.3V to RF switch control logic and microphone bias circuitry. Use Value: SOT23-5 package integrates seamlessly into 0.4mm-pitch flex PCB assemblies without requiring additional keep-out zones. |
Use Scenario: Handheld multimeters and insulation testers requiring dual-rail analog circuitry (±5V) from single 9V alkaline battery. IC Role / Device Role / Timing Role: Negative rail generator feeding op-amp comparators and precision voltage references. Use Value: 1.5V minimum input enables operation down to 6.5V battery voltage, extending usable battery range by 20% vs. higher-VIN alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX829EUK+T | 35kHz oscillator frequency; lower output impedance (~15Ω); requires smaller flying capacitor (3.3µF vs. 10µF). | Better suited for higher-current loads (>20mA) and tighter ripple budgets; higher frequency increases EMI risk in noise-sensitive analog sections. | Select MAX829EUK+T when load current exceeds 20mA or when board space limits capacitor size; otherwise MAX828EUK+T offers superior EMI profile. |
| MAX860ESA+T | Higher output current (50mA); µMAX-8 package; 600mV dropout at full load; requires three external capacitors. | Supports heavier analog loads (e.g., multiple op-amps) but consumes more board area and adds complexity with third capacitor. | Choose MAX860ESA+T only when >25mA output is mandatory; MAX828EUK+T remains optimal for IQ-critical, space-constrained designs. |
Compared with MAX829EUK+T and MAX860ESA+T, the MAX828EUK+T prioritizes ultra-low quiescent current and minimal external component count - making it the preferred choice for long-life, low-power portable instrumentation where 25mA output suffices and EMI must be minimized.
Availability
MAX828EUK+T is available at Aetrix Electronics and suitable for medical handheld instruments, small LCD panel biasing, and battery-operated test equipment requiring stable component supply with guaranteed long-term availability.
Supply support for MAX828EUK+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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications markets.
The MAX828/MAX829 product line was designed specifically for ultra-low-power, space-constrained voltage inversion in portable electronics - emphasizing minimal external components, sub-100µA IQ, and robust operation across wide input voltage ranges.
FAQ
What is the maximum output current capability of the MAX828EUK+T?
The MAX828EUK+T delivers up to 25mA output current with a typical voltage drop of 500mV at full load when VIN = +5V. This rating assumes proper capacitor selection (10µF flying cap, low-ESR), ambient temperature ≤+85°C, and adequate PCB thermal relief. Exceeding 25mA causes significant output droop and efficiency degradation due to its ~20Ω output impedance.
Does the MAX828EUK+T include built-in shutdown control?
No, the MAX828EUK+T does not integrate logic-controlled shutdown. It operates continuously when powered. For shutdown functionality, external circuitry (e.g., buffer-driven IN pin control per Figure 8 of the datasheet) or alternative parts like the MAX1719/MAX1720/MAX1721 must be used. The MAX828EUK+T's design focuses on minimizing quiescent current rather than adding control features.
Which external capacitors are required for basic operation of the MAX828EUK+T?
The MAX828EUK+T requires exactly two external capacitors for core operation: a flying capacitor (C1, typically 10µF ceramic or tantalum) connected between C1+ and C1– pins, and a reservoir/output capacitor (C2, same value) connected between OUT and GND. An optional 0.1µF bypass capacitor on the IN pin is strongly recommended to suppress switching noise and ensure stable startup.
Can the MAX828EUK+T generate regulated output voltage?
No, the MAX828EUK+T is an unregulated charge-pump inverter. Its output voltage follows VOUT ≈ –(VIN – IOUT × RS–), where RS– is output resistance (~20Ω). Output voltage droops linearly with load current and varies with input voltage. For regulated negative rails, a post-regulator (e.g., low-dropout linear regulator) or a different topology (e.g., inverting buck-boost) is required.
What is the operating temperature range specified for the MAX828EUK+T?
The MAX828EUK+T is rated for continuous operation from –40°C to +85°C. All electrical specifications in the datasheet - including 60µA quiescent current, 25mA output capability, and 95% efficiency - are guaranteed across this full industrial temperature range. Derating is not required within these limits, and the device uses standard SOT23-5 packaging qualified for extended thermal cycling.
MAX828EUK+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Ratiometric
- Output Configuration:
- 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
- Voltage - Output (Max):
- -
- Current - Output:
- 25mA
- Frequency - Switching:
- 12kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX828EUK+T FAQ
1.How can I place an order for MAX828EUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX828EUK+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 MAX828EUK+T reliable?
The price and inventory of MAX828EUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX828EUK+T is usually 5 days.
3.What payment methods are accepted for MAX828EUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX828EUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX828EUK+T?
MAX828EUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX828EUK+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 MAX828EUK+T?
For technical support, including MAX828EUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX828EUK+T requirements.
6.How does Aetrix verify that MAX828EUK+T is sourced from the original manufacturer or authorized distributors?
All MAX828EUK+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 MAX828EUK+T meets industry standards.
7.What is the process for return or replacement of MAX828EUK+T?
All MAX828EUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX828EUK+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 MAX828EUK+T part is unused and in its original packaging.
Return procedure for MAX828EUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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