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Analog Devices Inc./Maxim Integrated MAX629ESA+T
- Part No.:
- MAX629ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX629ESA+T.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX629ESA+T from Maxim Integrated is a low-power, high-voltage DC-DC converter IC with an integrated 500mA N-channel DMOS switch, programmable current limiting (250mA/500mA), and support for boost, flyback, and SEPIC topologies. It generates regulated positive or negative output voltages up to ±28V from input supplies as low as 0.8V, with 80μA quiescent current - ideal for LCD bias generation in portable instrumentation.
For engineers reviewing the MAX629ESA+T datasheet, MAX629ESA+T pinout, MAX629ESA+T application, or MAX629ESA+T equivalent, key selection criteria include its dual-polarity regulation capability, logic-controlled shutdown (1μA max), 300kHz switching frequency enabling compact magnetics, and SO-8 package compatibility with space-constrained battery-powered designs.
Technical Context
The MAX629ESA+T employs a pulse-frequency-modulation (PFM) control scheme with peak-current limiting and fixed on-time (max 10μs) plus programmable off-time (1.0–6.0μs), enabling high efficiency across wide load ranges. Its internal switch operates with 0.6Ω typical on-resistance at 5V VCC and supports both positive (POL = GND) and negative (POL = VCC) output configurations via dedicated feedback threshold selection.
Shutdown is controlled by an active-low SHDN pin that disables all internal circuitry except leakage paths, reducing supply current to ≤1μA. The REF pin provides a precision 1.25V reference (±1.2% over -40°C to +85°C) with 100μA sourcing capability, while FB input bias current remains ≤50nA - enabling high-impedance voltage-divider networks for stable output programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT Range | ±28V - supports full-range LCD biasing and varactor tuning without external level-shifting. |
| VCC Supply Voltage | +2.7V to +5.5V - compatible with standard logic rails and LDO outputs, independent of inductor input (0.8V to |VOUT|). |
| Quiescent Current | 80μA typical - enables multi-year battery life in always-on sensor or display bias applications. |
| Shutdown Current | ≤1μA - ensures negligible drain during system sleep modes in portable devices. |
| Switching Frequency | Up to 300kHz - allows use of miniature surface-mount inductors (e.g., 47μH) and reduces EMI filtering burden. |
| LX Current Limit | Selectable 250mA (ISET = GND) or 500mA (ISET = VCC) - enables trade-off between inductor size, output ripple, and max load current. |
| FB Reference Voltage | 1.250V ±12mV (–40°C to +85°C) - defines output accuracy for resistor-divider-based voltage setting with <0.15% load regulation. |
Pinout & Package
The MAX629ESA+T is housed in an 8-pin SO (Small Outline) package (Package Code S8-4, Outline 21-0041), with exposed pad not present and thermal resistance θJA = 132°C/W on single-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1. SHDN | Active-low shutdown control | Pulls internal bias and reference offline; reduces supply current to ≤1μA when grounded. |
| 2. POL | Polarity configuration input | Sets FB threshold to 1.25V (POL = GND, positive VOUT) or 0V (POL = VCC, negative VOUT). |
| 3. REF | 1.25V precision reference output | Stable, low-drift reference for external circuits; sources up to 100μA with 0.1μF bypass. |
| 4. FB | Feedback input | High-impedance (≤50nA bias) node for resistor-divider voltage sensing; determines regulated output. |
| 5. ISET | Current-limit selection | Chooses LX switch limit: 250mA (GND) or 500mA (VCC); directly impacts inductor sizing and ripple. |
| 6. GND | Analog/digital ground reference | Star-ground connection point for VCC bypass, output capacitor, and feedback network to minimize noise. |
| 7. LX | Switch drain terminal | Connects to inductor and flyback diode; handles pulsed currents up to 500mA with 0.6Ω on-resistance. |
| 8. VCC | Power supply input | Accepts +2.7V to +5.5V; powers internal circuitry independently from inductor input (VIN). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 500mA N-channel DMOS switch | Eliminates need for external FET, reducing BOM count and layout complexity in compact bias supplies. |
| Dual-polarity output configuration | Single IC supports both +28V and –28V generation via POL pin, simplifying design reuse across LCD driver variants. |
| Programmable current limit (250mA/500mA) | Enables optimization of inductor size, cost, and output ripple without changing IC - critical for cost-sensitive portable designs. |
| 80μA quiescent supply current | Extends battery runtime in always-on applications such as handheld test equipment and medical displays. |
| Logic-compatible shutdown (SHDN) | Allows direct interfacing with microcontroller GPIOs for dynamic power management without level-shifting. |
Applications
| Positive LCD Bias Generation | Negative LCD Bias Generation |
|---|---|
Use Scenario: Generating +24V bias for segment drivers in monochrome or grayscale LCD modules used in industrial HMIs and portable meters. IC Role / Device Role / Timing Role: Primary high-voltage DC-DC regulator operating in boost topology with POL = GND and FB referenced to 1.25V. Use Value: Delivers stable +24V at 5mA with <10mV ripple using 47μH inductor and MBR0540L Schottky diode - meeting display contrast and lifetime requirements. | Use Scenario: Providing –20V bias for common-electrode drive in automotive instrument cluster LCDs requiring dual-rail operation. IC Role / Device Role / Timing Role: Inverting DC-DC controller in flyback configuration with POL = VCC, regulating FB to 0V and generating negative output via charge pump stage. Use Value: Achieves –20V at 3mA with soft-start behavior and <15mV ripple, supporting fast turn-on and low-noise operation in safety-critical displays. |
| Varactor Tuning Diode Bias | 2-Cell Battery-Powered Instrumentation |
Use Scenario: Supplying adjustable –15V to –25V bias for RF varactor diodes in handheld spectrum analyzers and tunable filter modules. IC Role / Device Role / Timing Role: Precision negative voltage source with REF pin used to generate stable tuning voltage; ISET set to 250mA for low-ripple performance. Use Value: Enables 0.1% tuning linearity over temperature by maintaining <25mV total output variation - critical for frequency stability in RF front-ends. | Use Scenario: Powering analog front-end and display bias in portable multimeters powered by two alkaline cells (2.0V–3.2V nominal). IC Role / Device Role / Timing Role: High-efficiency boost converter accepting 0.8V–3.2V VIN while delivering regulated +28V to LCD and –15V to op-amp rails. Use Value: Maintains >75% efficiency down to 1mA load at 2.2V input - extending usable battery life beyond 200 hours per set. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Dual-output (±5V) charge-pump IC; no inductor required; fixed output; 100kHz operation; 100μA quiescent current. | Limited to ±5V outputs; unsuitable for >±10V biasing; lower efficiency above 10mA due to charge-pump architecture. | Choose MAX680ESA+ only for low-current, fixed ±5V applications where inductor elimination outweighs voltage range limitation. |
| LT3467ES6#TRPBF | Boost converter with 600mA switch; 1.2MHz switching; requires external compensation; 1.25V FB reference; wider VIN (2.7V–16V). | Higher frequency enables smaller LC components but increases EMI sensitivity; no native negative-output mode without additional circuitry. | Choose LT3467ES6#TRPBF when higher switching frequency and >500mA output are required, and negative output is implemented externally. |
Compared with MAX629ESA+T, MAX680ESA+ offers simpler layout but sacrifices voltage flexibility and load capability, while LT3467ES6#TRPBF delivers higher power density at the cost of added design complexity and no integrated polarity selection - making MAX629ESA+T optimal for dual-polarity, ±28V, low-quiescent applications in space-constrained portable systems.
Availability
MAX629ESA+T is available at Aetrix Electronics and suitable for LCD bias generation, varactor tuning, and 2-cell battery-powered instrumentation requiring stable component supply and long-term manufacturability.
Supply support for MAX629ESA+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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX629ESA+T belongs to Maxim's high-voltage DC-DC converter product line, designed specifically for low-power, battery-operated systems needing compact, efficient, and polarity-flexible bias generation - especially in portable instrumentation and display electronics.
FAQ
What is the maximum output voltage achievable with the MAX629ESA+T?
The MAX629ESA+T supports regulated output voltages up to +28V in positive configurations and down to –28V in negative configurations, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This capability is enabled by its internal 28V-rated N-channel DMOS switch and robust LX pin rating (–0.3V to +30V). Output voltage is set externally via resistor dividers on the FB pin, with accuracy maintained by the 1.25V reference and low FB bias current (≤50nA).
How does the ISET pin affect MAX629ESA+T performance?
The ISET pin on the MAX629ESA+T selects the internal switch current limit: connecting ISET to GND sets a 250mA limit, while connecting it to VCC sets 500mA. This directly determines peak inductor current, influencing maximum load capability, required inductor size, and output ripple amplitude. For example, at ISET = GND, a smaller 22μH inductor may suffice for low-current LCD bias, whereas ISET = VCC enables higher output current for varactor tuning at the cost of increased ripple unless compensated with larger output capacitance.
Can the MAX629ESA+T operate from a single 1.5V battery?
Yes - the MAX629ESA+T can operate with an inductor input voltage (VIN) as low as 0.8V, making it compatible with single 1.5V alkaline or NiMH cells under load. However, its VCC supply must be separately regulated to +2.7V to +5.5V (e.g., from a low-dropout regulator), as the IC's internal circuitry requires this rail. This split-supply architecture allows the inductor to draw from the raw battery while keeping VCC clean and stable, improving efficiency and noise immunity in ultra-low-voltage portable designs.
What is the purpose of the POL pin on the MAX629ESA+T?
The POL pin on the MAX629ESA+T configures the feedback reference threshold to enable regulation of either positive or negative output voltages. When POL = GND, the FB pin regulates to +1.25V, supporting boost-mode positive outputs. When POL = VCC, FB regulates to 0V, enabling inverting topologies for negative outputs. This dual-mode capability eliminates the need for separate positive/negative bias ICs in display systems, reducing BOM count and PCB area while maintaining identical layout footprints for both polarities.
Does the MAX629ESA+T include thermal protection?
Yes - the MAX629ESA+T incorporates thermal shutdown with a junction temperature threshold of +150°C, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. When die temperature exceeds this limit, the device halts switching and enters a safe state until temperature decreases. This protection is fully integrated and requires no external components. The SO-8 package has a junction-to-ambient thermal resistance (θJA) of 132°C/W on a single-layer board, meaning continuous power dissipation must remain below 471mW at +70°C ambient to avoid triggering shutdown under steady-state conditions.
MAX629ESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Boost, Flyback, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- ±0.8V
- Voltage - Output (Max):
- ±28V
- Current - Output:
- 500mA
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX629ESA+T FAQ
1.How can I place an order for MAX629ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX629ESA+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 MAX629ESA+T reliable?
The price and inventory of MAX629ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX629ESA+T is usually 5 days.
3.What payment methods are accepted for MAX629ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX629ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX629ESA+T?
MAX629ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX629ESA+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 MAX629ESA+T?
For technical support, including MAX629ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX629ESA+T requirements.
6.How does Aetrix verify that MAX629ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX629ESA+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 MAX629ESA+T meets industry standards.
7.What is the process for return or replacement of MAX629ESA+T?
All MAX629ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX629ESA+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 MAX629ESA+T part is unused and in its original packaging.
Return procedure for MAX629ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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