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Analog Devices Inc./Maxim Integrated MAX828EUK
- Part No.:
- MAX828EUK
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX828EUK.pdf
- Description:
- IC REG CHARG PUMP INV 25MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,841
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Product details
Overview
MAX828EUK 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 supports +1.5V to +5.5V input range - ideal for generating -5V from +5V logic rails to power analog circuitry in space-constrained portable systems.
For engineers reviewing the MAX828EUK datasheet, MAX828EUK pinout, MAX828EUK application, or MAX828EUK equivalent, this page provides verified technical context, real-world design meaning of key specs, validated SOT23-5 pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and parametric distinctions.
Technical Context
The MAX828EUK implements a two-phase charge-pump topology using on-chip power MOSFET switches (S1–S4) to invert VIN without inductors. Its oscillator frequency is fixed at 12kHz (typical), enabling predictable ripple and EMI behavior across temperature (-40°C to +85°C).
It is not a regulator: output voltage droop follows VOUT = –(VIN – IOUT × RS–), where RS– ≈ 20Ω at +25°C and VIN = +5V. Efficiency exceeds 94% at 5mA load and remains >90% across most of the 0–25mA range due to low 60µA quiescent current and optimized switch resistance.
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 regulation. |
| Oscillator Frequency | 12kHz (typ) - enables use of low-cost ceramic capacitors (10µF) and simplifies EMI filtering vs. higher-frequency pumps. |
| Output Current | 25mA - sufficient to power op-amps, ADC reference buffers, or small LCD bias supplies without thermal derating in SOT23-5. |
| Quiescent Current | 60µA - extends battery life in always-on sensor nodes or standby subsystems. |
| Voltage Conversion Efficiency | ≥94% at 5mA - minimizes heat generation and input power draw in thermally isolated modules. |
| Output Resistance | ≈20Ω at +25°C, VIN = +5V - defines load-induced droop: e.g., 10mA load causes ~200mV drop from ideal -5V. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and automotive cabin applications without derating. |
Pinout & Package
MAX828EUK is housed in a 5-pin SOT23-5 package (top mark AABI), with exposed pad not connected internally. The package supports reflow soldering per JEDEC J-STD-020 and has a thermal resistance θJA of ~270°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Inverting charge-pump output | Delivers negative voltage; connects to reservoir capacitor C2 and load; requires local bypassing for low-noise operation. |
| 2 - IN | Positive power-supply input | Accepts +1.5V to +5.5V; must be bypassed with ≥0.1µF ceramic capacitor near the pin to suppress switching transients. |
| 3 - C1- | Flying capacitor negative terminal | Completes charge-transfer path during phase 2; connects directly to negative lead of flying capacitor C1 (10µF). |
| 4 - C1+ | Flying capacitor positive terminal | Completes charge-transfer path during phase 1; connects directly to positive lead of flying capacitor C1 (10µF). |
| 5 - GND | Analog/digital ground reference | Common return for IN, OUT, and C1; must tie to low-impedance ground plane to minimize noise coupling into output. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 60µA enables >1-year battery life in coin-cell-powered instrumentation with intermittent analog sensing. |
| Fixed 12kHz oscillator | Eliminates external timing components and ensures consistent ripple frequency for predictable filter design. |
| Two-capacitor operation | Only C1 (flying) and C2 (reservoir) required - reduces BOM count and PCB area vs. inductor-based inverters. |
| High conversion efficiency | ≥94% at light loads reduces thermal stress in sealed enclosures and improves system-level power budget accuracy. |
| SOT23-5 footprint | Compatible with standard pick-and-place equipment and allows placement adjacent to load ICs to minimize trace inductance. |
Applications
| Portable Medical Sensors | Small LCD Bias Supply |
|---|---|
|
Use Scenario: Powering rail-to-rail op-amps and precision ADC front-ends in handheld glucose meters and pulse oximeters. IC Role / Device Role / Timing Role: Negative voltage generator providing clean -3.3V or -5V bias for analog signal conditioning stages. Use Value: 60µA quiescent current extends disposable battery life; 25mA output supports multi-channel analog acquisition without external regulators. |
Use Scenario: Generating negative gate drive voltage for STN/TFT LCD panels in PDAs and industrial HMIs. IC Role / Device Role / Timing Role: Compact inverting charge pump delivering stable -10V to -15V (via cascading) from 3.3V/5V main rail. Use Value: SOT23-5 size fits tight bezel layouts; 12kHz switching avoids audible noise while enabling low-ESR ceramic capacitor use. |
| Battery-Powered Data Loggers | Industrial Sensor Signal Conditioning |
|
Use Scenario: Providing dual ±5V supplies for low-power instrumentation amplifiers in remote environmental monitoring nodes. IC Role / Device Role / Timing Role: Primary negative rail generator paired with linear regulator or LDO for symmetric analog supply. Use Value: -40°C to +85°C rating ensures reliable startup in outdoor enclosures; high efficiency preserves capacity over multi-year deployments. |
Use Scenario: Biasing precision current sources and programmable gain amplifiers in 4–20mA loop-powered transmitters. IC Role / Device Role / Timing Role: Local negative supply source decoupled from noisy field-side power rails. Use Value: Low 20Ω output resistance maintains voltage stability under dynamic load steps; minimal external components reduce failure points. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX829EUK | 35kHz oscillator frequency; uses 3.3µF flying capacitor; higher supply current (115µA typ); same SOT23-5 package and pinout. | Better suited for applications requiring lower output ripple or smaller capacitors; less optimal for ultra-low-power standby modes. | Select MAX829EUK when minimizing capacitor size or ripple is prioritized over quiescent current. |
| MAX860ESA+ | Higher 50mA output capability; 600mV dropout at full load; µMAX-8 package; requires different layout and capacitor values. | Targeted at higher-current analog subsystems (e.g., multi-channel DACs); not drop-in compatible due to different pin count and package. | Choose MAX860ESA+ only when >25mA output is required and board redesign for µMAX-8 is acceptable. |
Compared with MAX828EUK, MAX829EUK offers faster switching and smaller external caps but trades off 1.9× higher quiescent current, while MAX860ESA+ delivers double the current in a larger 8-pin package - making MAX828EUK the optimal choice for ultra-low-power, space-constrained inverter needs.
Availability
MAX828EUK is available at Aetrix Electronics and suitable for portable medical sensors, small LCD bias supplies, battery-powered data loggers, industrial sensor signal conditioning, and handheld terminals requiring stable component supply with guaranteed -40°C to +85°C performance.
Supply support for MAX828EUK 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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX828/MAX829 product line was designed specifically for compact, high-efficiency DC-DC voltage inversion in battery-operated and board-level systems where inductors are undesirable - emphasizing low IQ, minimal external components, and robust SOT23-5 integration.
FAQ
What is the maximum output current specification for MAX828EUK?
The MAX828EUK is specified to deliver up to 25mA output current with a maximum voltage drop of 500mV under full-load conditions at +25°C. This value is guaranteed across the full -40°C to +85°C operating range when using recommended 10µF flying and reservoir capacitors and maintaining proper PCB layout and thermal conditions. Exceeding 25mA may cause excessive droop or thermal shutdown in sustained operation.
Does MAX828EUK include an internal voltage regulator?
No, the MAX828EUK is not a regulated inverter - it is a switched-capacitor voltage inverter with no feedback control loop. Its output voltage follows VOUT ≈ –(VIN – IOUT × RS–), where RS– is the effective output resistance (~20Ω at +25°C). Output regulation depends entirely on input stability, capacitor selection, and load constancy; external LDOs or post-regulation are required for precise voltage tolerance.
What capacitor values are required for stable operation of MAX828EUK?
The MAX828EUK requires two external capacitors: a 10µF low-ESR ceramic flying capacitor (C1) between pins C1+ and C1–, and a 10µF low-ESR ceramic reservoir capacitor (C2) between OUT and GND. A 0.1µF ceramic bypass capacitor is also mandatory between IN and GND. Using smaller values increases output resistance and ripple; larger values yield diminishing returns beyond 10µF due to internal switch resistance dominance.
Can MAX828EUK operate from a 1.8V input supply?
Yes, the MAX828EUK supports input voltages as low as +1.5V, so it operates fully within specification at +1.8V. At this voltage, typical output is approximately –1.7V (accounting for ~100mV droop at light load), with efficiency remaining above 90%. However, output current capability decreases proportionally - e.g., maximum usable load drops to ~12mA at 1.8V input due to reduced charge transfer per cycle.
Is MAX828EUK pin-compatible with MAX829EUK?
Yes, MAX828EUK and MAX829EUK share identical pinout, package (SOT23-5), and footprint - both use top mark AABI (MAX828EUK) and AABJ (MAX829EUK). They are functionally interchangeable at the board level, though their oscillator frequencies (12kHz vs. 35kHz), capacitor requirements (10µF vs. 3.3µF), and quiescent currents (60µA vs. 115µA) differ significantly and must be accounted for in final design validation.
MAX828EUK 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:
- 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:
- 12kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-TSOP
MAX828EUK FAQ
1.How can I place an order for MAX828EUK through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX828EUK 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 reliable?
The price and inventory of MAX828EUK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX828EUK is usually 5 days.
3.What payment methods are accepted for MAX828EUK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX828EUK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX828EUK?
MAX828EUK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX828EUK 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?
For technical support, including MAX828EUK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX828EUK requirements.
6.How does Aetrix verify that MAX828EUK is sourced from the original manufacturer or authorized distributors?
All MAX828EUK 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 meets industry standards.
7.What is the process for return or replacement of MAX828EUK?
All MAX828EUK units undergo pre-shipment inspection (PSI). If there is an issue with MAX828EUK, 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 part is unused and in its original packaging.
Return procedure for MAX828EUK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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