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Analog Devices Inc./Maxim Integrated MAX868EUB+T
- Part No.:
- MAX868EUB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX868EUB+T.pdf
- Description:
- IC REG CHRG PUMP INV 30MA 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,718
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Product details
Overview
The MAX868EUB+T from Maxim Integrated is a regulated, adjustable -2× inverting charge pump DC-DC converter that generates a stable negative output voltage up to -2 × VIN from a 1.8V–5.5V positive input. It delivers up to 30mA output current with 30µA quiescent supply current and uses pulse-frequency modulation (PFM) control at up to 450kHz for high light-load efficiency. It targets space-constrained, battery-powered systems such as medical instruments and handheld terminals requiring compact, inductorless negative rail generation.
For engineers reviewing the MAX868EUB+T datasheet, MAX868EUB+T pinout, MAX868EUB+T application, or MAX868EUB+T equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters across -40°C to +85°C, and real-world design implications for regulated negative voltage generation without inductors.
Technical Context
The MAX868EUB+T implements a two-phase PFM-controlled charge pump using internal switches to alternately charge flying capacitors (C1, C2) in parallel and discharge them in series into the output capacitor. Its feedback loop monitors output voltage via the FB pin and dynamically gates the 450kHz oscillator to maintain regulation - enabling ultra-low 30µA quiescent current at light loads while sustaining full 30mA capability.
It supports both regulated operation (via external R1/R2 divider on FB) and unregulated -2× inversion (FB tied to IN), with open-loop output resistance of 70Ω (typ) and closed-loop output resistance of 125Ω (typ). Shutdown is logic-controlled with 0.1µA shutdown current and active pull-down of OUT to GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, NiMH, and 3.3V/5V system rails without external LDO pre-regulation. |
| Output Current | Up to 30mA - sufficient for biasing LCD VEE, op-amp dual supplies, or sensor analog front-ends. |
| Quiescent Supply Current | 30µA - enables >1-year battery life in always-on portable medical or PDA applications. |
| Oscillator Frequency | 270kHz to 630kHz (typ 450kHz) - high switching frequency permits use of 0.1µF–0.22µF ceramic flying capacitors, reducing board area. |
| Shutdown Current | 0.1µA - ensures negligible drain during system sleep modes in cordless phones or handy-terminals. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and automotive cabin-adjacent environments. |
| Output Regulation Accuracy | ±40mV FB trip point - enables precise -3.3V, -5V, or -7.5V generation with external resistor divider. |
Pinout & Package
The MAX868EUB+T is housed in a 10-pin µMAX package (3mm × 3mm × 1.11mm), offering 50% smaller footprint than standard 8-pin SO packages and optimized for ultra-compact portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Analog Ground | Reference node for FB and internal circuitry; must be short-traced to PGND for stability. |
| OUT (Pin 2) | Charge-Pump Output | Negative regulated output terminal; actively pulled to GND during shutdown. |
| C1- (Pin 3) | Negative Terminal of Flying Capacitor C1 | Connects to negative side of first flying cap; part of charge/discharge switching path. |
| PGND (Pin 4) | Power Ground | High-current return path for flying capacitor switching; tie directly to GND with minimal trace length. |
| C1+ (Pin 5) | Positive Terminal of Flying Capacitor C1 | Connects to positive side of first flying cap; forms half of parallel-charge configuration. |
| C2- (Pin 6) | Negative Terminal of Flying Capacitor C2 | Connects to negative side of second flying cap; completes series discharge path with C1+. |
| IN (Pin 7) | Supply-Voltage Input | Primary power input (1.8V–5.5V); also serves as VREF when FB is tied to IN for -2× mode. |
| C2+ (Pin 8) | Positive Terminal of Flying Capacitor C2 | Connects to positive side of second flying cap; enables dual-capacitor charge-pump topology. |
| SHDN (Pin 9) | Active-Low Shutdown Input | Logic-controlled enable: tie to GND for 0.1µA shutdown; tie to IN for normal operation. |
| FB (Pin 10) | Feedback Input | Monitors output via resistor divider; connects to IN for fixed -2× inversion or to divider for adjustable regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Regulated Negative Output | Adjustable down to -2 × VIN (e.g., -7.5V from 5V input) with ±40mV FB threshold tolerance. |
| Inductorless Architecture | Uses only four external ceramic capacitors - eliminates EMI, size, and cost penalties of magnetic components. |
| On-Demand PFM Control | Dynamically gates 450kHz oscillator to reduce switching losses at light load, preserving >80% efficiency at 1mA. |
| Ultra-Low Shutdown Current | 0.1µA shutdown current enables true "off" state in battery-backed systems without leakage concerns. |
| Compact µMAX Package | 3mm × 3mm footprint with 1.11mm height - fits within tight spacing constraints of PDAs and medical handhelds. |
Applications
| Small LCD Panel Bias | Portable Medical Instrumentation |
|---|---|
|
Use Scenario: Generating negative VEE bias for monochrome or segment LCD displays in handheld terminals and PDAs. IC Role / Device Role / Timing Role: Inverting charge pump providing regulated -3.3V or -5V rail independent of main system supply. Use Value: Eliminates need for discrete inductor-based converters, reducing BOM count and PCB area by >40% versus buck-boost alternatives. |
Use Scenario: Powering precision analog front-ends (e.g., ECG amplifiers, sensor signal conditioners) requiring clean, low-noise dual supplies. IC Role / Device Role / Timing Role: Low-quiescent-current negative rail generator supporting always-on monitoring with battery longevity. Use Value: 30µA quiescent current extends single-AA battery life beyond 18 months in intermittent-use diagnostic devices. |
| Cell Phone Peripheral Supply | Industrial Handheld Terminal |
|
Use Scenario: Providing isolated negative voltage for RF front-end ICs or audio codecs in GSM/CDMA handsets. IC Role / Device Role / Timing Role: Compact, low-EMI charge pump delivering stable -2.5V to -5V under dynamic load transients. Use Value: 450kHz PFM operation minimizes conducted noise coupling into sensitive RF sections versus fixed-frequency PWM solutions. |
Use Scenario: Enabling ruggedized data capture terminals operating in warehouses or field service environments (-40°C to +85°C). IC Role / Device Role / Timing Role: Industrial-grade inverting regulator supporting extended temperature range and reliable startup from weak batteries. Use Value: Guaranteed -40°C operation and 0.1µA shutdown ensure functional integrity during cold storage or outdoor deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Fixed -2× output (no FB pin); 100mA output; SO-8 package; higher quiescent current (120µA). | Suitable for higher-current, non-adjustable applications where board space allows SO-8. | Select MAX680ESA+ only if fixed -2× output and >30mA load are required - not pin-compatible with MAX868EUB+T. |
| TPS60403DBVR | Adjustable -2× output; 60mA output; 5-pin SOT-23; requires different capacitor configuration and lacks PGND separation. | Better suited for ultra-low-cost, lower-precision consumer electronics with less stringent EMI requirements. | Choose TPS60403DBVR for cost-sensitive designs needing smaller package but accepting reduced thermal performance and no PGND/GND isolation. |
Compared with MAX680ESA+ and TPS60403DBVR, the MAX868EUB+T uniquely combines adjustable regulation, ultra-low 30µA quiescent current, dedicated PGND for noise isolation, and µMAX packaging - making it optimal for precision, space-constrained, battery-critical applications where output flexibility and efficiency across load range are essential.
Availability
MAX868EUB+T is available at Aetrix Electronics and suitable for small LCD panels, portable medical instrumentation, and industrial handheld terminals requiring stable component supply with guaranteed -40°C to +85°C operation and long-term lifecycle support.
Supply support for MAX868EUB+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 MAX868EUB+T belongs to Maxim's charge pump DC-DC converter product line, designed specifically for compact, inductorless generation of regulated negative voltages in battery-powered portable equipment.
FAQ
What is the maximum output current supported by the MAX868EUB+T?
The MAX868EUB+T delivers up to 30mA of continuous output current under typical conditions (VIN = 3.3V, VOUT = -5V, TA = +25°C), with absolute maximum rating of 35mA. At full load, it maintains regulation with ≤±40mV error and operates within its 444mW power dissipation limit at +70°C ambient. The MAX868EUB+T achieves this without inductors, relying on optimized flying capacitor sizing and PFM control.
Can the MAX868EUB+T generate a regulated -3.3V output from a 3.3V input?
Yes - the MAX868EUB+T can generate a regulated -3.3V output from a 3.3V input using an external resistor divider connected to the FB pin. With VIN = 3.3V, connecting R1 = 330kΩ and R2 = 500kΩ between OUT, FB, and GND sets VOUT ≈ -3.3V. The MAX868EUB+T's ±40mV FB trip point ensures accuracy within ±1% over temperature, and its PFM control preserves >75% efficiency at 10mA load.
What is the purpose of the separate PGND and GND pins on the MAX868EUB+T?
The MAX868EUB+T features separate PGND (Pin 4) and GND (Pin 1) pins to isolate high-current switching return paths from sensitive analog reference nodes. PGND carries pulsed currents from flying capacitor switching, while GND serves as the quiet reference for the FB comparator and internal bias circuits. This separation reduces ground bounce and improves regulation accuracy - especially critical in low-noise applications like medical instrumentation where the MAX868EUB+T is commonly deployed.
Does the MAX868EUB+T require external compensation components for stability?
The MAX868EUB+T is internally compensated for standard configurations and does not require external compensation under typical operating conditions. However, when using large feedback resistors (>1MΩ) or driving high-ESR output capacitors, a feed-forward capacitor (CC up to 47pF) may be added across R1 to ensure phase margin. This requirement is explicitly documented in the MAX868EUB+T datasheet's Design Procedure section and verified in Figure 4 and associated text.
How does the MAX868EUB+T achieve high efficiency at light loads?
The MAX868EUB+T achieves high light-load efficiency through pulse-frequency modulation (PFM): the internal 450kHz oscillator is gated on only as needed to maintain output regulation, reducing switching losses dramatically below 1mA. This results in just 30µA quiescent supply current and >80% efficiency at 1mA load - far superior to fixed-frequency charge pumps. The MAX868EUB+T's PFM architecture is intrinsic to its design and confirmed across all electrical characteristics tables and typical operating curves.
MAX868EUB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Ratiometric
- Output Configuration:
- Negative
- Topology:
- Charge Pump
- Output Type:
- Adjustable (Programmable)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, -2Vin
- Voltage - Output (Max):
- -2Vin
- Current - Output:
- 30mA
- Frequency - Switching:
- 270kHz ~ 630kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-uMAX/uSOP
MAX868EUB+T FAQ
1.How can I place an order for MAX868EUB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX868EUB+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 MAX868EUB+T reliable?
The price and inventory of MAX868EUB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX868EUB+T is usually 5 days.
3.What payment methods are accepted for MAX868EUB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX868EUB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX868EUB+T?
MAX868EUB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX868EUB+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 MAX868EUB+T?
For technical support, including MAX868EUB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX868EUB+T requirements.
6.How does Aetrix verify that MAX868EUB+T is sourced from the original manufacturer or authorized distributors?
All MAX868EUB+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 MAX868EUB+T meets industry standards.
7.What is the process for return or replacement of MAX868EUB+T?
All MAX868EUB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX868EUB+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 MAX868EUB+T part is unused and in its original packaging.
Return procedure for MAX868EUB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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