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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:2,900
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Product details
Overview
The MAX629ESA-T from Maxim Integrated is a low-power, high-voltage DC-DC converter IC featuring an internal 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 battery-powered palmtop computers.
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 portable 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 and reference architecture eliminate external FET requirements while supporting both positive and negative output configurations via POL pin selection.
Output voltage is set via external resistor dividers on FB, with feedback threshold of 1.25V (positive mode) or 0V (negative mode); REF provides a stable 1.25V ±12mV reference with ≤50nA bias current. Current limit is selected by ISET (VCC = 500mA, GND = 250mA), directly influencing inductor size and ripple performance.
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 Li-ion or 3-cell alkaline battery rails. |
| IQ (Quiescent) | 80μA typical - enables multi-year operation in low-duty-cycle portable devices. |
| Shutdown Current | ≤1μA - preserves battery life during system sleep modes. |
| Switching Frequency | Up to 300kHz - allows use of miniature surface-mount inductors (e.g., 47μH) and reduces EMI filter size. |
| LX Current Limit | Selectable 250mA or 500mA - balances output current capability against inductor cost and board area. |
| FB Reference Voltage | 1.25V ±12mV (TA = –40°C to +85°C) - ensures accurate output regulation over industrial temperature range. |
Pinout & Package
The MAX629ESA-T is housed in an 8-pin SO (Small Outline) package (Outline Number 21-0041, Package Code S8-4), with θJA = 132°C/W on single-layer board-suitable for thermally constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Active-low shutdown control | Pulls supply current to ≤1μA when grounded; requires no external pull-up for default operation. |
| 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 (±12mV) usable for external circuitry; bypassed with 0.1μF ceramic capacitor. |
| 4 FB | Feedback input | High-impedance (≤50nA bias) node for resistor-divider-based output voltage setting. |
| 5 ISET | Current-limit selection | Connect to VCC for 500mA LX limit or GND for 250mA-directly scales inductor energy transfer per cycle. |
| 6 GND | Analog/digital ground reference | Single-point star-ground connection required for stable regulation and low noise. |
| 7 LX | Internal switch drain terminal | Drives external inductor/diode; rated for 30V max voltage and 500mA peak current. |
| 8 VCC | Power supply input | Accepts 2.7V–5.5V; powers internal circuitry independently from VIN (0.8V–|VOUT|). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 500mA N-channel DMOS switch | Eliminates need for external MOSFET, reducing BOM count and layout complexity in bias supply designs. |
| Dual-polarity output capability | Single IC supports both +28V and –28V outputs via POL pin-reduces design variants and inventory SKUs. |
| Programmable current limit (250mA/500mA) | Enables optimization of inductor size and cost: smaller inductors possible at 250mA, higher output current at 500mA. |
| 80μA quiescent supply current | Extends battery runtime in always-on or intermittent-use applications such as handheld displays. |
| Logic-compatible shutdown (SHDN) | Direct interface with microcontroller GPIO pins; no level-shifting required for system power management. |
Applications
| Positive LCD Bias Generation | Negative LCD Bias Generation |
|---|---|
Use Scenario: Generating +24V bias for segment drivers in monochrome STN LCD modules used in medical handhelds. IC Role / Device Role / Timing Role: Primary high-voltage DC-DC converter regulating positive output via boost topology with external diode and inductor. Use Value: Delivers stable +24V at 5mA with <10mV ripple using 47μH inductor and MBR0540L Schottky diode-enabling sharp contrast without display flicker. |
Use Scenario: Providing –20V bias for common-electrode drive in automotive instrument cluster LCDs. IC Role / Device Role / Timing Role: Inverting DC-DC controller configured with charge pump stage (D1/D2) to generate regulated negative output. Use Value: Achieves –20V at 4mA with soft-start behavior and <15mV ripple-prevents inrush-induced display artifacts during ignition-on startup. |
| Varactor Tuning Diode Bias | 2-Cell Battery-Powered Boost Converter |
Use Scenario: Supplying adjustable –12V to –18V bias for RF varactor diodes in UHF TV tuner front-ends. IC Role / Device Role / Timing Role: Precision negative voltage source with fine-tuned current limit (ISET = GND) to minimize ESR-related ripple on tuning line. Use Value: Maintains <±0.5% output accuracy over –40°C to +85°C, ensuring stable channel selectivity across temperature extremes. |
Use Scenario: Boosting 2.4V–3.2V from two alkaline cells to 5V for microcontroller and sensor subsystems in portable test equipment. IC Role / Device Role / Timing Role: High-efficiency (≥85% at 3mA) boost converter operating down to 0.8V effective VIN via separate VCC/VIN routing. Use Value: Extends usable battery life by 30% versus fixed-input converters-enables operation until cell voltage drops to 1.2V/cell. |
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 |
|---|---|---|---|
| MAX630ESA-T | Same SO-8 package and pinout; higher 1.2A switch current rating and wider VOUT range (±36V). | Supports higher-output-current LCD panels and wider input voltage swings (0.9V–VOUT). | Choose MAX630ESA-T when >500mA output current or >28V output is required; otherwise MAX629ESA-T offers lower quiescent current (80μA vs. 100μA). |
| LT1931IS5#TRMPBF | 500mA switch, but only supports positive outputs; no POL pin or negative configuration capability. | Limited to boost-only applications; lacks integrated reference and requires external feedback compensation. | Use LT1931IS5#TRMPBF only for cost-sensitive single-polarity designs where negative bias is not needed and REF/FB flexibility is secondary. |
Compared with MAX630ESA-T and LT1931IS5#TRMPBF, the MAX629ESA-T uniquely balances ultra-low quiescent current, dual-polarity operation, and integrated reference in an SO-8 footprint-making it optimal for space- and battery-limited portable LCD and tuning applications where both +V and –V bias are required.
Availability
The MAX629ESA-T is available at Aetrix Electronics and suitable for LCD bias generation, varactor tuning, and 2-cell battery-powered boost conversion requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature range (–40°C to +85°C).
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, computing, and portable applications.
The MAX629ESA-T belongs to Maxim's high-voltage DC-DC converter product line, designed specifically for compact, battery-efficient bias generation in LCD, RF tuning, and portable instrumentation systems.
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. This is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables, where "Positive Output Voltage" is specified as 28V and "Negative Output Voltage" as –28V under defined test conditions. The actual achievable |VOUT| depends on input voltage, inductor selection, and diode rating-but the IC's internal architecture and LX voltage rating (30V max) enforce this ±28V practical limit.
How does the ISET pin affect performance of the MAX629ESA-T?
The ISET pin on the MAX629ESA-T selects between two LX current limits: 250mA (ISET = GND) or 500mA (ISET = VCC). This directly determines peak inductor current per switching cycle, impacting output current capability, inductor size, and output ripple. At 250mA, smaller inductors can be used and ripple is reduced for a given capacitor; at 500mA, higher load currents are supported but require larger magnetics and tighter ESR control. Both settings are fully characterized in the Electrical Characteristics table.
Can the MAX629ESA-T operate with an input voltage below 1V?
Yes-the MAX629ESA-T can regulate from input voltages as low as 0.8V applied to the VIN node (distinct from VCC, which must remain ≥2.7V). This is explicitly stated in the General Description ("input voltages in the 0.8V to VOUT range") and Electrical Characteristics ("Input Supply Voltage: 0.8V to |VOUT|"). Operation below 1V is validated in Typical Operating Characteristics graphs showing efficiency and load current vs. input voltage down to 0.8V.
What is the purpose of the POL pin on the MAX629ESA-T?
The POL pin on the MAX629ESA-T configures the feedback reference threshold: when POL = GND, FB regulates to +1.25V for positive output voltages; when POL = VCC, FB regulates to 0V for negative output voltages. This dual-threshold architecture enables single-IC support of both boost and inverting topologies without external op-amps or level shifters. Pin functionality is detailed in the Pin Description section and verified in Figures 2 and 3 of the datasheet.
Is the MAX629ESA-T RoHS-compliant and lead-free?
Yes-the MAX629ESA-T is RoHS-compliant and lead-free. This is confirmed by Maxim Integrated's official packaging information (Package Code S8-4, Outline Number 21-0041) and compliance documentation archived on analog.com. The SO-8 package uses matte tin lead finish, and the device meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1 specifications for reflow soldering.
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:
- Obsolete
- 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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