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Analog Devices Inc./Maxim Integrated MAX1748EUE+
- Part No.:
- MAX1748EUE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX1748EUE+.pdf
- Description:
- IC REG CONV TFT LCD 3OUT 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,555
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Product details
Overview
MAX1748EUE+ from Maxim Integrated is a triple-output DC-DC converter IC designed for active-matrix TFT-LCD bias power supplies, integrating one 1MHz current-mode PWM boost regulator (VMAIN up to +13V, ±1% accuracy, 93% efficiency) and two independent charge pumps (VPOS up to +40V, VNEG down to −40V) in a 16-pin TSSOP package. It delivers regulated voltages for LCD gate/source drivers in portable displays.
For engineers reviewing the MAX1748EUE+ datasheet, MAX1748EUE+ pinout, MAX1748EUE+ application, or MAX1748EUE+ equivalent, this page provides verified technical context, real-world sequencing behavior, confirmed soft-start phases, validated charge-pump regulation thresholds, and precise pin-functional mapping - all extracted from the official Maxim datasheet Rev 0 (10/04).
Technical Context
The MAX1748EUE+ implements a fixed-frequency (1MHz) current-mode PWM boost architecture with internal 0.35Ω n-channel MOSFET, enabling high-efficiency step-up conversion from +2.7V to +5.5V input to VMAIN up to +13V. Its feedback loop uses a 1.248V nominal reference at FB with <±50nA bias current and supports integrator-based DC load regulation via INTG.
It integrates dual independent charge pumps: a positive doubler (DRVP/SUPP, 500kHz switching, FBP-regulated to 1.25V) and a negative inverter (DRVN/SUPN, 500kHz, FBN-regulated to 0V), each using internal p-channel/n-channel MOSFETs and proprietary ripple-minimizing control. Power-up sequencing is strictly VMAIN → VNEG → VPOS with soft-start per stage and fault-dependent shutdown propagation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +2.7V to +5.5V - supports single-cell Li-ion or 3.3V/5V system rails without external LDO pre-regulation. |
| Main Output (VMAIN) | Up to +13V at 200mA - programmable via FB resistive divider; ±1% regulation accuracy ensures stable gate-on voltage for TFT pixel switching. |
| Charge-Pump Outputs | VPOS up to +40V, VNEG down to −40V - configurable via external diode/capacitor stages; enables full-range biasing of LCD source/gate drivers. |
| Switching Frequency | 1MHz (boost), 500kHz (charge pumps) - allows use of ultra-small ceramic capacitors and <10µH inductors, minimizing board area. |
| Efficiency | Up to 93% (boost only, VIN=3.3V, VMAIN=10V, IMAIN=100mA) - reduces thermal load in space-constrained handheld displays. |
| Shutdown Current | 0.1µA - extends battery life in PDAs and digital cameras during display-off states. |
| Soft-Start | Four-phase current-limit ramp (0.38A → 0.75A → 1.12A → 1.5A) - prevents input surge and output overshoot during cold start. |
Pinout & Package
MAX1748EUE+ is housed in a 16-pin thin-shrink TSSOP package (4.4mm × 5.0mm, max height 1.1mm), optimized for low-profile portable LCD modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RDY | Active-low open-drain ready indicator | Pulls low (125Ω typ) only after full VMAIN→VNEG→VPOS sequencing completes; used for system power-good signaling. |
| 2 FB | Main boost feedback input | Regulates VMAIN to 1.248V nominal; connects to resistor divider from VMAIN to GND - sets output voltage precisely. |
| 3 INTG | Integrator output | Enables improved DC load regulation when bypassed with 470pF to GND; disable by tying to REF for lower transient overshoot. |
| 4 IN | Main input supply | +2.7V to +5.5V input; requires local 0.1µF ceramic bypass to GND for stable operation and noise suppression. |
| 5 GND | Analog ground reference | Must be connected to PGND under IC; separates analog sensing from power return paths to minimize noise coupling. |
| 6 REF | Internal 1.25V reference output | Sources up to 50µA; bypassed with 0.22µF capacitor to GND - used as precision reference for all three regulators. |
| 7 FBP | Positive charge-pump feedback | Regulates VPOS to 1.25V nominal; connects to resistive divider from VPOS to GND - determines final positive bias voltage. |
| 8 FBN | Negative charge-pump feedback | Regulates VNEG to 0V nominal; connects to resistive divider from VNEG to GND - enables accurate negative bias generation. |
| 9 SHDN | Active-low shutdown control | Logic low disables all converters and reference; must not float - tie to IN if unused to ensure default enable. |
| 10 DRVN | Negative charge-pump driver output | Drives external flying capacitor; swings between VSUPN and PGND - controls inversion cycle timing and charge transfer. |
| 11 SUPN | Negative pump supply input | +2.7V to +13V input for negative pump; bypassed with 0.1µF capacitor to PGND - powers DRVN stage. |
| 12 DRVP | Positive charge-pump driver output | Drives external flying capacitor; swings between VSUPP and PGND - controls doubling cycle and output voltage buildup. |
| 13 SUPP | Positive pump supply input | +2.7V to +13V input for positive pump; bypassed with 0.1µF capacitor to PGND - powers DRVP stage. |
| 14 PGND | Power ground return | High-current return path for LX, SUPP, SUPN, DRVN, DRVP; must be tied to GND under IC for thermal and EMI performance. |
| 15 LX | Main boost switch node | Drain of internal n-MOSFET; connects to external diode and output capacitor - critical for EMI layout and efficiency. |
| 16 TGND | Thermal ground pad | Must be connected to PCB ground plane; improves thermal dissipation and stabilizes internal bias references. |
Key Features
| Feature | Design Value |
|---|---|
| Triple integrated regulation | Single-chip solution replaces three discrete DC-DC stages - eliminates inter-stage timing mismatches and reduces BOM count by ≥12 components. |
| Internal MOSFETs | 0.35Ω n-channel LX switch + p/n-channel charge-pump drivers - removes need for external high-voltage switches and simplifies layout. |
| Proprietary charge-pump control | Minimizes output ripple and capacitor size for both VPOS/VNEG - enables use of smaller, cheaper ceramics instead of large tantalums. |
| Programmable sequencing | VMAIN→VNEG→VPOS startup order with fault-dependent shutdown - prevents latch-up in LCD driver ICs requiring strict voltage ramp order. |
| Ultra-thin TSSOP package | 1.1mm max height - meets mechanical constraints of slim PDAs, digital cameras, and camcorders. |
Applications
| TFT Active-Matrix LCD Displays | Portable Digital Assistants (PDAs) |
|---|---|
Use Scenario: Driving gate-on/gate-off and source bias voltages for high-resolution color LCD panels in handheld medical monitors and industrial HMIs. IC Role / Device Role / Timing Role: Provides synchronized, sequenced VMAIN (+10V), VNEG (−5V), and VPOS (+15V) with RDY confirmation - ensuring safe panel initialization before data loading. Use Value: Eliminates external sequencing logic and discrete regulators, reducing footprint by >40% versus multi-chip solutions while guaranteeing fault-safe power-up. | Use Scenario: Supplying bias rails for monochrome or grayscale TFT displays in legacy enterprise PDAs with tight battery-life requirements. IC Role / Device Role / Timing Role: Delivers low-quiescent (0.6mA) and ultra-low shutdown (0.1µA) operation - extends standby time without compromising startup reliability. Use Value: Enables >100-hour display-off battery life while maintaining sub-3ms total sequencing time for responsive user interface wake-up. |
| Digital Still Cameras | Camcorders |
Use Scenario: Powering high-brightness LCD viewfinders and rear-panel displays that require rapid on/off cycling during burst shooting. IC Role / Device Role / Timing Role: Uses four-phase soft-start and fast fault recovery to prevent display flicker or corruption during repeated power toggling. Use Value: Achieves consistent VMAIN regulation within 3ms and full triple-rail readiness in <12ms - matches camera UI responsiveness expectations. | Use Scenario: Biasing wide-format LCD screens in consumer camcorders subject to vibration, temperature swing, and battery sag. IC Role / Device Role / Timing Role: Maintains ±1% VMAIN accuracy across −40°C to +85°C and tolerates input dips to 2.7V - ensures stable contrast and grayscale fidelity. Use Value: Prevents display artifacts during motion or low-battery recording by sustaining regulation even under dynamic load transients up to 200mA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output TFT-LCD DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8726EUE+ | Same pinout and core architecture, but adds fixed 16ms delay between VMAIN and VNEG startup and 4ms delay between VNEG and VPOS - no soft-start on charge pumps. | Better suited for systems requiring deterministic inter-rail delays to avoid cross-conduction in legacy LCD drivers. | Select MAX8726EUE+ only if your design mandates guaranteed minimum inter-stage delays; otherwise MAX1748EUE+ offers faster, adaptive sequencing. |
| TPS65136RGTR | Single-chip triple-output converter with integrated LDOs, but lacks negative charge pump - VNEG generated externally or omitted; 2.5MHz switching vs. 1MHz. | Targeted at newer AMOLED or low-voltage LCDs where negative bias is unnecessary or handled separately. | Choose TPS65136RGTR only if negative rail is not required and higher switching frequency is acceptable; MAX1748EUE+ remains sole choice for full ±40V bias capability. |
Compared with MAX8726EUE+, MAX1748EUE+ delivers faster, load-adaptive sequencing without fixed delays - improving startup time in battery-sensitive devices. Against TPS65136RGTR, MAX1748EUE+ uniquely supports true dual-rail ±40V generation in one package, making it irreplaceable for legacy TFT-LCDs requiring symmetric high-voltage bias.
Availability
MAX1748EUE+ is available at Aetrix Electronics and suitable for TFT-LCD display modules, portable medical imaging devices, and industrial human-machine interfaces requiring stable component supply across extended temperature ranges.
Supply support for MAX1748EUE+ 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 demanding industrial, automotive, and portable applications.
The MAX1748/MAX8726 product line was engineered specifically for compact, high-efficiency bias power in active-matrix LCD systems - prioritizing ultra-thin packaging, integrated sequencing, and wide-output-voltage charge pumps over general-purpose DC-DC flexibility.
FAQ
What is the maximum output voltage achievable with the MAX1748EUE+ main boost converter?
The MAX1748EUE+ main boost converter supports an output voltage (VMAIN) up to +13V, set via an external resistive divider connected to the FB pin. This range spans from the input voltage (VIN) up to +13V, with ±1% regulation accuracy across −40°C to +85°C. The 1.248V FB reference and low-input-bias-current amplifier enable precise, stable voltage setting for TFT gate driver rails.
How does the MAX1748EUE+ handle power-up sequencing between its three outputs?
The MAX1748EUE+ enforces strict VMAIN → VNEG → VPOS sequencing: VMAIN starts first and must reach regulation before VNEG begins; once VNEG reaches ~88% of target (VFBN < 110mV), VPOS starts. RDY goes low only after VPOS hits ~90% (VFBP > 1.125V). Unlike MAX8726EUE+, it uses adaptive soft-start without fixed inter-stage delays.
Can the MAX1748EUE+ generate both positive and negative high-voltage rails simultaneously?
Yes - the MAX1748EUE+ independently regulates VPOS up to +40V (via positive charge pump) and VNEG down to −40V (via negative charge pump), using separate external diode-capacitor networks. Each pump operates at 500kHz, employs internal p/n-channel MOSFETs, and uses proprietary control to minimize ripple and capacitor size - enabling full biasing of TFT source/gate drivers from a single 3.3V/5V input.
What is the shutdown current consumption of the MAX1748EUE+ and how is it controlled?
The MAX1748EUE+ draws only 0.1µA in shutdown mode when SHDN is pulled low. This ultra-low current maximizes battery life in portable devices. SHDN is an active-low logic input; it must never be left floating - tie to IN if unused. During shutdown, all converters and the internal 1.25V reference are disabled, and output voltages decay based on load and capacitance.
Does the MAX1748EUE+ include internal MOSFETs or require external switches?
The MAX1748EUE+ integrates all critical power switches: a 0.35Ω n-channel MOSFET for the main boost converter (LX pin), plus p-channel and n-channel MOSFETs for both charge-pump drivers (DRVP and DRVN pins). No external high-voltage switches are needed - only external diodes, flying/reservoir capacitors, and feedback resistors are required for full operation.
MAX1748EUE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Converter, TFT LCD
- Voltage - Input:
- 2.7V ~ 5.5V
- Number of Outputs:
- 3
- Voltage - Output:
- 2.7V ~ 13V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
MAX1748EUE+ FAQ
1.How can I place an order for MAX1748EUE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1748EUE+ 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 MAX1748EUE+ reliable?
The price and inventory of MAX1748EUE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1748EUE+ is usually 5 days.
3.What payment methods are accepted for MAX1748EUE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1748EUE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1748EUE+?
MAX1748EUE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1748EUE+ 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 MAX1748EUE+?
For technical support, including MAX1748EUE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1748EUE+ requirements.
6.How does Aetrix verify that MAX1748EUE+ is sourced from the original manufacturer or authorized distributors?
All MAX1748EUE+ 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 MAX1748EUE+ meets industry standards.
7.What is the process for return or replacement of MAX1748EUE+?
All MAX1748EUE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1748EUE+, 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 MAX1748EUE+ part is unused and in its original packaging.
Return procedure for MAX1748EUE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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