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Analog Devices Inc./Maxim Integrated MAX686EEE+
- Part No.:
- MAX686EEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX686EEE+.pdf
- Description:
- IC REG BOOST ADJ 600MA 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:622
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Product details
Overview
The MAX686EEE+ from Maxim Integrated is a DAC-controlled boost/inverter IC designed to generate programmable positive or negative LCD bias voltages up to +27.5V or −27.5V from input sources as low as +0.8V. It integrates a 500mA/28V N-channel MOSFET switch, 6-bit DAC, current-limited PFM control, and LCDON power-control output - enabling compact, high-efficiency bias generation in portable LCD systems.
For engineers reviewing the MAX686EEE+ datasheet, MAX686EEE+ pinout, MAX686EEE+ application, or MAX686EEE+ equivalent, this device supports digital voltage tuning of LCD bias rails, automatic display power sequencing via LCDON, and robust operation across −40°C to +85°C with <65µA quiescent current - critical for battery-powered handheld instrumentation and embedded displays.
Technical Context
The MAX686EEE+ employs a current-limited pulse-frequency-modulation (PFM) architecture with selectable 250mA or 500mA peak inductor current limits (via ISET), enabling high efficiency (>90%) across wide load ranges. Its dual-mode regulation - FB setpoint at 1.25V for positive outputs or 0V for negative outputs - is controlled by the POL pin, while internal DAC output (0–1.25V, 6-bit resolution) directly adjusts feedback network gain to scale VOUT magnitude.
Switching frequency reaches up to 300kHz, supporting small external components (e.g., 22µH inductor); soft-start behavior is implemented via extended minimum off-time (5µs) during initial power-up. The device features integrated reference (1.25V ±2%), power-OK comparator (1.125V threshold), and shutdown mode reducing supply current to 1.5µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | +27.5V or −27.5V - digitally adjustable via 6-bit DAC for precise LCD bias tuning |
| Input Voltage Range (VCC/VDD) | +2.7V to +5.5V - compatible with standard logic-supply rails |
| Inductor Input Range (VIN) | +0.8V to +27.5V - enables direct battery connection without pre-regulation |
| Internal Switch Rating | 500mA/28V N-channel MOSFET - eliminates need for external FET in most LCD bias designs |
| Quiescent Current | 65µA - extends battery life in always-on portable displays |
| Shutdown Current | 1.5µA - ensures minimal leakage during display sleep modes |
| Switching Frequency | Up to 300kHz - allows use of miniature 22µH inductors and low-ESR ceramic capacitors |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive-grade portable equipment |
Pinout & Package
MAX686EEE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm), pin-compatible with industry-standard 16-pin SOIC footprints but with reduced height for space-constrained LCD modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 1) | Power Ground | Low-impedance return path for LX switch current; must be connected to system GND |
| LX (Pin 16) | Switch Drain Node | Drain of internal 500mA N-MOSFET; connects to inductor and output rectifier |
| UP / DN (Pins 2, 3) | DAC Control Inputs | Rising-edge-triggered up/down counter increments/decrements DAC code to adjust |VOUT| magnitude |
| ISET (Pin 5) | Current Limit Select | Connect to VCC for 500mA limit or GND for 250mA limit - sets energy per switching cycle |
| SHDN (Pin 6) | Shutdown Enable | Logic-low disables all circuitry except DAC state retention; draws only 1.5µA |
| DACOUT (Pin 7) | DAC Output Voltage | 0–1.25V, 6-bit resolution; drives external resistor network to scale VOUT |
| POL (Pin 8) | Polarity Control | GND = positive output mode (FB regulated to 1.25V); VCC = negative output mode (FB regulated to 0V) |
| LCDON (Pin 14) | Open-Drain Power Control | Sinks up to 6mA to drive external PNP/P-ch MOSFET for LCD on/off sequencing |
| FB (Pin 9) | Feedback Input | High-impedance node (±50nA bias) sensing divider output; regulates VOUT via DAC-adjusted gain |
| REF (Pin 10) | Internal Reference | 1.25V ±2% precision reference; requires ≥0.1µF ceramic bypass to GND |
| POK (Pin 11) | Power-OK Sense Input | Monitors VIN or VOUT via resistive divider; triggers LCDON when >1.125V |
| VCC / VDD (Pins 11, 13) | Supply Inputs | VCC powers logic/bias circuits; VDD supplies gate driver - both require +2.7V to +5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 500mA/28V N-MOSFET | Eliminates external switch, reduces BOM count and PCB area in LCD bias supplies |
| 6-bit DAC with mid-scale power-up | Ensures known VOUT(MID) at startup (e.g., +18.65V or −18.85V), preventing display overvoltage |
| Programmable current limiting (250/500mA) | Optimizes inductor size and output ripple for specific load requirements |
| Automatic LCD power sequencing | LCDON output disables bias rail when POK falls below 1.125V - protects display from undervoltage stress |
| High-efficiency PFM control | Maintains >85% efficiency at 1–10mA loads across input voltages from 3V to 12V |
| Wide input voltage support (0.8V–27.5V) | Accepts direct connection to primary batteries (e.g., Li-ion, alkaline) without pre-regulator |
Applications
| Positive LCD Bias Generation | Negative LCD Bias Generation |
|---|---|
Use Scenario: Generating stable +15V to +25V bias for STN/TN LCD panels in handheld medical instruments. IC Role / Device Role / Timing Role: Primary DC-DC converter providing regulated positive high-voltage rail; DAC enables field calibration of contrast voltage. Use Value: 65µA quiescent current extends battery runtime; integrated switch reduces component count by 3–4 parts versus discrete solutions. |
Use Scenario: Producing −12V to −20V bias for reflective LCDs in ruggedized data terminals operating in −25°C environments. IC Role / Device Role / Timing Role: Inverting DC-DC controller with polarity-selectable regulation; POL pin configures FB threshold for negative output stability. Use Value: −40°C to +85°C rating ensures reliability in cold-storage logistics devices; 300kHz switching minimizes EMI in dense PCB layouts. |
| Varactor Tuning Diode Bias | Portable Display Power Management |
Use Scenario: Supplying adjustable reverse-bias voltage (0–25V) to varactor diodes in handheld RF tuners for antenna impedance matching. IC Role / Device Role / Timing Role: Precision programmable HV source; UP/DN pins enable real-time tuning via microcontroller GPIOs. Use Value: 6-bit DAC resolution (19.8mV/LSB) provides fine-grained capacitance control; 1.5µA shutdown current preserves battery charge during standby. |
Use Scenario: Managing dual-polarity LCD bias and backlight enable in palmtop computers with single-cell Li-ion input. IC Role / Device Role / Timing Role: Central bias generator coordinating with system MCU via DAC control and LCDON handshake signal. Use Value: LCDON open-drain output synchronizes display power-off with logic rail removal - prevents ghosting and panel damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LCD bias supply applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX629EEE+ | No integrated DAC; requires external resistor network for fixed VOUT; same 16-QSOP package and −40°C to +85°C rating | Suitable only for static bias voltage designs; lacks digital adjustment capability | Select when cost-sensitive designs require fixed output and no field calibration is needed |
| TPS65131RGTR | TI part with integrated positive/negative charge pumps (not inductive); 3.3V–5.5V input only; no internal switch for inductive topologies | Lower noise, smaller footprint, but limited to ≤±15V and <10mA loads; unsuitable for high-current or wide-input applications | Choose for ultra-low-noise, low-power segment LCDs where inductor-free design is prioritized |
Compared with MAX686EEE+, MAX629EEE+ removes DAC functionality but retains identical thermal and package specs, while TPS65131RGTR offers charge-pump simplicity at the expense of output voltage range and load capability - making MAX686EEE+ optimal for programmable, high-voltage, inductor-based LCD bias where flexibility and efficiency are critical.
Availability
MAX686EEE+ is available at Aetrix Electronics and suitable for portable medical monitors, industrial handheld terminals, and ruggedized data-collection devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX686EEE+ 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, communications, and consumer applications.
The MAX686EEE+ belongs to Maxim's LCD bias supply product line, engineered specifically for space-constrained, battery-powered portable displays requiring digitally adjustable dual-polarity high-voltage rails with minimal external components.
FAQ
What is the maximum output voltage achievable with the MAX686EEE+?
The MAX686EEE+ supports a maximum output voltage of +27.5V in boost configuration and −27.5V in inverting configuration. These limits are defined by internal switch voltage rating and process constraints - exceeding them risks permanent damage. Output voltage is digitally adjusted via the 6-bit DAC and external resistor network (R1–R3), with full-scale accuracy guaranteed within ±3% mid-scale error.
How does the MAX686EEE+ handle power sequencing for LCD displays?
The MAX686EEE+ uses its LCDON open-drain output and POK input to manage LCD power sequencing. When POK voltage drops below 1.125V (indicating input or output undervoltage), LCDON goes high-impedance, turning off an external PNP transistor or P-channel MOSFET that supplies power to the LCD. This prevents display damage during brown-out conditions - a key protection feature confirmed in the MAX686EEE+ functional diagram and typical operating characteristics.
Can the MAX686EEE+ operate from a single-cell lithium-ion battery?
Yes - the MAX686EEE+ accepts an inductor input voltage (VIN) from +0.8V to +27.5V, fully covering the discharge range of a single Li-ion cell (≈4.2V down to ≈2.8V). Its VCC/VDD supply requirement (+2.7V to +5.5V) is met by tapping the same battery through a simple LDO or directly if voltage remains above 2.7V. Efficiency curves show >85% at 3V input and 5mA load, confirming suitability for Li-ion-powered portable displays.
What is the role of the ISET pin on the MAX686EEE+?
The ISET pin on the MAX686EEE+ selects the peak inductor current limit: connecting ISET to VCC sets 500mA, while grounding it sets 250mA. This directly controls energy transfer per switching cycle - higher current enables greater output current capability and faster transient response, whereas lower current reduces inductor size, output ripple, and EMI. Both settings are validated across the full −40°C to +85°C range per the MAX686EEE+ electrical characteristics table.
Does the MAX686EEE+ retain DAC settings during shutdown?
Yes - the MAX686EEE+ retains its DAC setting during shutdown as long as VCC remains above the DAC reset threshold of 2.1V (min). This is explicitly stated in the datasheet notes: "The DAC setting is guaranteed to remain valid as long as VCC is greater than the VCC DAC Reset Threshold." Upon wake-up, the output resumes at the previously programmed voltage level, eliminating re-calibration delays in portable systems.
MAX686EEE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive or Negative
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.8V
- Voltage - Input (Max):
- 27.5V
- Voltage - Output (Min/Fixed):
- ±1.25V
- Voltage - Output (Max):
- ±27.5V
- Current - Output:
- 600mA (Switch)
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
MAX686EEE+ FAQ
1.How can I place an order for MAX686EEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX686EEE+ 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 MAX686EEE+ reliable?
The price and inventory of MAX686EEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX686EEE+ is usually 5 days.
3.What payment methods are accepted for MAX686EEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX686EEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX686EEE+?
MAX686EEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX686EEE+ 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 MAX686EEE+?
For technical support, including MAX686EEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX686EEE+ requirements.
6.How does Aetrix verify that MAX686EEE+ is sourced from the original manufacturer or authorized distributors?
All MAX686EEE+ 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 MAX686EEE+ meets industry standards.
7.What is the process for return or replacement of MAX686EEE+?
All MAX686EEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX686EEE+, 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 MAX686EEE+ part is unused and in its original packaging.
Return procedure for MAX686EEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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