My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX629ESA+
- Part No.:
- MAX629ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX629ESA+.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:703
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX629ESA+ 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 battery-powered palmtop computers.
For engineers reviewing the MAX629ESA+ datasheet, MAX629ESA+ pinout, MAX629ESA+ application, or MAX629ESA+ equivalent, key selection considerations include its dual-polarity regulation capability, logic-controlled shutdown (1μA max), 300kHz switching frequency enabling compact magnetics, and SO-8 package compatibility with industrial temperature range (-40°C to +85°C).
Technical Context
The MAX629ESA+ employs a pulse-frequency-modulation (PFM) control scheme with peak-current limiting and fixed on-time (max 10μs) plus configurable off-time (1.0–6.0μs), enabling high efficiency across wide load ranges. Its internal switch operates with programmable current limits via ISET pin (GND = 250mA, VCC = 500mA), directly determining inductor energy transfer per cycle.
Regulation polarity is selected by POL pin (GND for positive output with 1.25V FB threshold; VCC for negative output with 0V FB threshold), while feedback accuracy is maintained by ≤50nA FB input bias current and a stable 1.25V reference (±1.5% over -40°C to +85°C) at REF pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT Range | ±28V - supports both positive LCD bias (e.g., +24V) and negative bias (e.g., -20V) without external FET. |
| VCC Supply Current | 80μA typical - enables multi-year battery life in low-duty-cycle portable devices. |
| Shutdown Current | ≤1μA - preserves battery charge during system sleep modes. |
| Switching Frequency | Up to 300kHz - allows use of small, low-profile surface-mount inductors (e.g., 47μH). |
| Current Limit Options | 250mA (ISET = GND) or 500mA (ISET = VCC) - selects inductor size and output ripple trade-off. |
| FB Set Point Accuracy | 1.218V to 1.282V over -40°C to +85°C - ensures stable output voltage regulation across industrial temp range. |
| LX On-Resistance | 0.6Ω min / 1.4Ω max (VCC = 3.3–5V) - defines conduction loss and thermal rise under full load. |
Pinout & Package
The MAX629ESA+ is housed in an 8-pin SO (Small Outline) package (Outline Number 21-0041, Package Code S8-4), with exposed pad not present and standard JEDEC SOIC footprint (Land Pattern 90-0096). Thermal resistance θJA = 132°C/W on single-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Active-low shutdown control | Pulls supply current to ≤1μA when grounded; must be tied to VCC for normal operation. |
| 2 POL | Polarity configuration input | Selects FB threshold: GND → 1.25V (positive VOUT); VCC → 0V (negative VOUT). |
| 3 REF | 1.25V precision reference output | Sources up to 100μA; requires 0.1μF bypass cap for loads ≤10μA. |
| 4 FB | Feedback input | Monitors resistive divider; ≤50nA bias current enables high-value R1/R2 for low power loss. |
| 5 ISET | Current limit select | GND = 250mA LX limit; VCC = 500mA LX limit - sets inductor peak current and ripple. |
| 6 GND | Analog/digital ground reference | Star-ground connection point for VCC bypass, output capacitor, and feedback network. |
| 7 LX | Switch drain node | Connects to inductor and diode; handles up to 30V transient; requires short, low-inductance PCB trace. |
| 8 VCC | Power supply input | Accepts 2.7V–5.5V only; powers internal circuitry - separate from VIN (0.8V–|VOUT|) applied to inductor. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 500mA N-channel DMOS switch | Eliminates external MOSFET, reducing BOM count and layout complexity in space-constrained designs. |
| Programmable current limit (250mA/500mA) | Enables optimization of inductor size, cost, and output ripple - e.g., 250mA mode permits smaller 22μH inductors for low-VIN operation. |
| Logic-compatible shutdown (SHDN) | Direct interface with microcontroller GPIO; <1μA shutdown current extends battery runtime in intermittent-use systems. |
| Dual-polarity regulation (POS/NEG) | Single IC replaces two discrete converters - simplifies design for LCD panels requiring both +VBias and -VBias. |
| High PFM efficiency (up to 95%) | Maintains >80% efficiency down to 0.1mA load - critical for standby and low-power display modes. |
Applications
| Positive LCD Bias Generator | Negative LCD Bias Generator |
|---|---|
Use Scenario: Generating +24V bias for STN or TFT LCD segment drivers in handheld medical instruments. IC Role / Device Role / Timing Role: Primary high-voltage DC-DC regulator configured in boost topology with POL = GND and FB set to 1.25V. Use Value: Delivers stable +24V at 5mA with <10mV ripple using 47μH inductor and MBR0540L Schottky diode - eliminates need for external transistor stage. | Use Scenario: Providing -20V gate bias for active-matrix OLED displays in ultra-thin tablets. IC Role / Device Role / Timing Role: Inverting DC-DC controller in flyback configuration with POL = VCC, REF used to bias feedback network. Use Value: Achieves -20V output with soft-start behavior (5μs off-time extension) and <15mV ripple - prevents display flicker during power-up. |
| Varactor Tuning Diode Bias | 2-Cell Battery-Powered Palmtop Computer |
Use Scenario: Supplying adjustable 0–28V tuning voltage to RF varactor diodes in portable spectrum analyzers. IC Role / Device Role / Timing Role: Programmable high-voltage source using external DAC coupled to FB via resistor RB (Figure 4). Use Value: Enables precise 0.1V resolution tuning across full range with <0.5% line regulation - improves frequency stability in VCO circuits. | Use Scenario: Powering LCD backlight and analog front-end in legacy palmtop PCs running on two AA cells (2.4–3.2V). IC Role / Device Role / Timing Role: Dual-output bias generator: one MAX629ESA+ for +15V (boost), another for -12V (inverting), both sharing same VCC rail. Use Value: Operates down to 0.8V effective VIN (via separate battery tap) while maintaining 85% efficiency at 3mA - extends usable battery life by 30% vs. linear solutions. |
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+ | Same SO-8 package and pinout; higher 350mA switch current limit; 100μA supply current. | Optimized for higher output current (e.g., >5mA LCD bias); less suitable for ultra-low-quiescent designs. | Select MAX630ESA+ when load current exceeds 5mA and 100μA ICC is acceptable. |
| LT1931ES5#TRPBF | 500mA switch, but fixed 1.25V FB threshold; no POL pin - supports positive output only; 100μA supply current. | Limited to boost-only (not inverting) topologies; requires external level-shifting for negative bias. | Choose LT1931ES5#TRPBF only for positive-output-only systems where board area is constrained and polarity flexibility is unnecessary. |
Compared with MAX629ESA+, MAX630ESA+ offers higher current drive but increased quiescent consumption, while LT1931ES5#TRPBF sacrifices polarity flexibility for marginally better EMI performance in fixed-boost applications - MAX629ESA+ remains optimal for dual-polarity, ultra-low-IQ systems.
Availability
The MAX629ESA+ is available at Aetrix Electronics and suitable for LCD bias generation, varactor tuning, and 2–3 cell battery-powered portable electronics requiring stable component supply across industrial temperature range.
Supply support for MAX629ESA+ 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, communications, and consumer applications.
The MAX629ESA+ belongs to Maxim's high-voltage DC-DC converter product line, designed specifically for compact, battery-efficient bias generation in portable displays and RF tuning circuits - emphasizing low IQ, dual-polarity operation, and minimal external component count.
FAQ
What is the operating temperature range of the MAX629ESA+?
The MAX629ESA+ is rated for industrial operation from -40°C to +85°C, verified across all electrical parameters in this range. This makes it suitable for deployment in outdoor portable equipment and automotive infotainment displays where ambient temperatures fluctuate widely. The junction temperature limit is +150°C, with thermal shutdown engaging at approximately 150°C to protect the die.
Can the MAX629ESA+ generate both positive and negative output voltages?
Yes, the MAX629ESA+ supports both polarities via the POL pin: connect POL to GND for positive output regulation (e.g., +24V) with 1.25V FB threshold, or to VCC for negative output (e.g., -20V) with 0V FB threshold. This dual-mode capability is intrinsic to the MAX629ESA+ architecture and does not require external component reconfiguration beyond the feedback divider.
What is the maximum output voltage achievable with the MAX629ESA+?
The MAX629ESA+ supports output voltages up to ±28V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. For positive outputs, this is achieved in boost configuration; for negative outputs, it uses inverting flyback with charge pump staging. Output voltage accuracy remains within ±1.5% over temperature when using precision feedback resistors.
How does the ISET pin affect MAX629ESA+ performance?
The ISET pin on the MAX629ESA+ selects the internal switch current limit: tying ISET to GND sets 250mA, while tying to VCC sets 500mA. This directly determines peak inductor current, allowable output current, required inductor size, and output ripple amplitude - enabling design trade-offs between board area, cost, and regulation stability.
Is an evaluation kit available for the MAX629ESA+?
Yes, an official evaluation kit is available for the MAX629ESA+, referenced in the datasheet as "EVALUATION KIT AVAILABLE". It provides a fully assembled and tested PCB implementing both positive and negative output configurations, including optimized layout, component selection (inductor, diode, capacitors), and test points for efficiency and transient measurements - accelerating prototyping of MAX629ESA+ designs.
MAX629ESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX629ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX629ESA+ 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+ reliable?
The price and inventory of MAX629ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX629ESA+ is usually 5 days.
3.What payment methods are accepted for MAX629ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX629ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX629ESA+?
MAX629ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX629ESA+ 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+?
For technical support, including MAX629ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX629ESA+ requirements.
6.How does Aetrix verify that MAX629ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX629ESA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX629ESA+?
All MAX629ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX629ESA+, 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+ part is unused and in its original packaging.
Return procedure for MAX629ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX629ESA+ Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
