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Analog Devices Inc./Maxim Integrated MAX1779EUE+TGA8
- Part No.:
- MAX1779EUE+TGA8
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- -
- Datasheet:
-
MAX1779EUE+TGA8.pdf
- Description:
- INTEGRATED CIRCUIT
- Quantity:
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Inventory:1,296
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Product details
Overview
MAX1779EUE+TGA8 from Maxim Integrated is a triple-output DC-DC converter optimized for TFT LCD bias generation, integrating one 250kHz current-mode PWM boost regulator (VMAIN up to +13V, ±1% regulation) and two independent charge pumps (VPOS up to +40V, VNEG down to −40V) with internal MOSFETs, soft-start, and power-ready sequencing. It operates from +2.7V to +5.5V input and delivers high efficiency (up to 91%) in ultra-thin TSSOP-16 packaging.
For engineers reviewing the MAX1779EUE+TGA8 datasheet, MAX1779EUE+TGA8 pinout, MAX1779EUE+TGA8 application, or MAX1779EUE+TGA8 equivalent, key selection criteria include output voltage programmability (via FB/FBP/FBN resistive dividers), integrated sequencing logic, shutdown current (0.1µA), and compatibility with ceramic capacitors and small inductors (10–33µH) in space-constrained portable displays.
Technical Context
The MAX1779EUE+TGA8 implements a fixed-frequency 250kHz current-mode PWM architecture for its main boost converter, enabling fast transient response and stable operation with low-ESR ceramic output capacitors. Its internal 1Ω N-channel MOSFET switch and integrated slope compensation eliminate external compensation components in standard configurations.
Its dual charge-pump regulators operate at 125kHz (½ fOSC) using internal P/N-channel MOSFET drivers (DRVN/DRVP) and proprietary ripple-minimizing control algorithms. Each pump features independent feedback (FBN/VFBN = 0V nominal; FBP/VFBP = 1.25V nominal) and fault detection thresholds tied to reference-derived trip points (e.g., FBN fault at +140mV rising edge).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +2.7V to +5.5V - supports single-cell Li-ion or dual-cell alkaline input without pre-regulation. |
| Main Output (VMAIN) | Up to +13V, ±1% regulation - enables TFT gate-on voltage generation with tight tolerance across load/temperature. |
| Charge-Pump Outputs | VPOS up to +40V, VNEG down to −40V - configurable via external diode-capacitor stages for source/gate driver bias in active-matrix panels. |
| Switching Frequency | 250kHz (boost), 125kHz (charge pumps) - allows use of <3mm-height inductors and 0402/0603 ceramic caps in ultra-thin designs. |
| Efficiency | Up to 91% (main boost, 5V out @ 100mA) - minimizes thermal rise in sealed handheld enclosures. |
| Shutdown Current | 0.1µA - extends battery life in always-on display standby modes (e.g., PDA quick-wake). |
| Package | 16-pin TSSOP, 1.1mm max height - fits sub-3mm total thickness stacks in digital still cameras and camcorders. |
Pinout & Package
MAX1779EUE+TGA8 is housed in a lead-free 16-pin Thin Shrink Small Outline Package (TSSOP) with maximum height of 1.1mm, designed for high-density PCB layouts in portable LCD systems. Thermal pad is not present; PGND and TGND must be connected to ground plane under the IC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RDY | Active-low open-drain ready indicator | Pulled low (125Ω typ) only after full power-up sequence completes; requires external 100kΩ pull-up to IN for logic-level interface. |
| 2 FB | Main boost feedback input | Senses VMAIN via resistor divider; regulates to 1.248V (typ) - sets output voltage as VMAIN = (1 + R1/R2) × 1.248V. |
| 3 INTG | Integrator output | Connect 2200pF to GND for improved DC load regulation; tie to REF to disable integrator and reduce transient overshoot. |
| 4 IN | Main input supply | +2.7V to +5.5V input; bypassed with 0.1µF ceramic cap placed adjacent to pin for EMI suppression and stability. |
| 5 GND | Analog ground reference | Must be connected to PGND underneath IC; separates analog sensing from power return paths. |
| 6 REF | Internal 1.25V reference output | Supplies up to 50µA; bypassed with 0.22µF capacitor to GND - used as reference for FBP/FBN and fault thresholds. |
| 7 FBP | Positive charge-pump feedback | Regulates VPOS to 1.25V nominal at FBP node; connects to resistor divider from VPOS to GND. |
| 8 FBN | Negative charge-pump feedback | Regulates VNEG to 0V nominal at FBN node; connects to resistor divider from VNEG to REF (not GND). |
| 9 SHDN | Active-low shutdown control | Logic low disables all converters and reference; connect to IN if unused - prevents floating input and unintended shutdown. |
| 10 DRVN | Negative pump driver output | Drives external flying capacitor; swings between VSUPN (high) and PGND (low) at 125kHz. |
| 11 SUPN | Negative pump supply input | Bypassed to PGND with 0.1µF capacitor; accepts +2.7V to +13V - typically derived from VMAIN or separate rail. |
| 12 DRVP | Positive pump driver output | Drives external flying capacitor; swings between VSUPP (high) and PGND (low) at 125kHz. |
| 13 SUPP | Positive pump supply input | Bypassed to PGND with 0.1µF capacitor; accepts +2.7V to +13V - often sourced from VMAIN or dedicated supply. |
| 14 PGND | Power ground return | High-current return path for LX, DRVN, DRVP; must be low-impedance connection to GND under IC body. |
| 15 LX | Main boost switch node | Connects to Schottky diode anode and output capacitor; peak current limited to 650mA (typ); 1Ω on-resistance MOSFET drain. |
| 16 TGND | Thermal ground tie | Must be connected to system ground - provides thermal conduction path and stabilizes internal bias networks. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power MOSFET | 1Ω (typ) N-channel LX switch eliminates external high-side FET and reduces BOM count by ≥3 components. |
| Internal supply sequencing | Reference → VMAIN → VNEG → VPOS → RDY assertion ensures safe startup in multi-rail LCD bias chains without external controllers. |
| Proprietary charge-pump regulation | Minimizes output ripple and capacitor size for both VPOS/VNEG by dynamically adjusting MOSFET on-resistance per cycle. |
| Power-ready output (RDY) | Open-drain signal confirms all outputs are within regulation and fault-free - simplifies system power management state tracking. |
| Ultra-thin TSSOP package | 1.1mm max height enables integration into <3mm-thick camera modules and PDA bezels where Z-height is constrained. |
Applications
| TFT Active-Matrix LCD Displays | Digital-Still Cameras |
|---|---|
|
Use Scenario: Generating gate-on (+15V), gate-off (−10V), and source-driver (VDD = +5V) rails for 3.5"–5" color TFT panels in handheld devices. IC Role / Device Role / Timing Role: Single-chip triple-output bias generator replacing discrete boost + dual charge-pump solutions. Use Value: Reduces component count by 12+ parts (inductors, diodes, caps, controllers), cuts PCB area by >40%, and eliminates inter-stage timing mismatches. |
Use Scenario: Powering CCD/CMOS image sensor bias, LCD backlight driver, and touch-screen controller in compact DSLR-style cameras. IC Role / Device Role / Timing Role: Primary display power IC delivering sequenced VPOS/VNEG/VMAIN with fault reporting during burst capture mode. Use Value: Enables <200ms cold-start display wake-up with guaranteed regulation before image processing begins. |
| Passive-Matrix LCD Displays | Camcorders |
|
Use Scenario: Supplying segmented VDD (5V), VLCD (12V), and contrast-adjust (−5V) voltages for monochrome STN displays in medical handhelds. IC Role / Device Role / Timing Role: Low-quiescent-current (0.5mA) triple regulator supporting intermittent display usage with rapid reactivation. Use Value: Extends battery runtime by 3.2 hours per 1000mAh cell versus discrete solutions due to 91% peak efficiency and 0.1µA shutdown. |
Use Scenario: Providing stable VMAIN (10V), VPOS (18V), and VNEG (−12V) for wide-viewfinder OLED and recording circuitry in palm-sized camcorders. IC Role / Device Role / Timing Role: High-reliability bias IC with integrated fault detection (RDY high-impedance on any output fault) for continuous video recording. Use Value: Prevents display corruption during motion-induced voltage sag by maintaining regulation down to VIN = 2.7V with no brownout reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output LCD DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1771EUB+ | Single-output boost converter (no charge pumps); 300kHz switching; 1.5A current limit. | Requires external dual charge-pump ICs (e.g., MAX680) to replicate MAX1779EUE+TGA8 functionality. | Select when board space permits modular design or when VPOS/VNEG requirements are fixed and non-adjustable. |
| TPS65120RGTR | Triple-output with integrated LDO post-regulators; 1.2MHz switching; lower VMAIN max (7.5V). | Lacks programmable VPOS/VNEG beyond ±15V; higher quiescent current (2.5mA vs. 0.5mA). | Select when tighter output voltage accuracy (<±0.5%) and lower noise are prioritized over battery life and ultra-thin packaging. |
Compared with MAX1779EUE+TGA8, MAX1771EUB+ requires additional components to achieve triple output but offers higher current capability, while TPS65120RGTR trades off adjustable high-voltage charge-pump range and ultra-low shutdown current for improved noise performance and integrated post-regulation - making MAX1779EUE+TGA8 optimal for cost- and height-sensitive portable LCDs requiring ±40V flexibility.
Availability
MAX1779EUE+TGA8 is available at Aetrix Electronics and suitable for TFT LCD displays, digital-still cameras, and camcorders requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant lead-free packaging.
Supply support for MAX1779EUE+TGA8 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 portable, industrial, and communications applications.
The MAX1779EUE+TGA8 belongs to Maxim's TFT LCD power management product line, engineered specifically to consolidate high-voltage bias generation for active-matrix displays into a single ultra-thin package with integrated sequencing and fault protection.
FAQ
What is the maximum output voltage achievable from the main boost converter in MAX1779EUE+TGA8?
The MAX1779EUE+TGA8 main boost converter supports a VMAIN output up to +13V, regulated to ±1% accuracy across load and temperature. This is set via an external resistor divider connected to the FB pin, with regulation referenced to the internal 1.248V feedback threshold. Operation above +13V is not supported and may damage the LX switch or exceed absolute maximum ratings.
How does the power-up sequencing work in MAX1779EUE+TGA8?
MAX1779EUE+TGA8 executes a fixed internal sequence: first the 1.25V reference powers up, then the main boost converter (VMAIN), followed by the negative charge pump (VNEG), then the positive charge pump (VPOS), and finally the RDY pin is pulled low. Sequencing is autonomous - no external timing components are needed - and ensures safe ramp-up of bias rails critical for TFT panel integrity.
Can MAX1779EUE+TGA8 generate both positive and negative outputs simultaneously?
Yes, MAX1779EUE+TGA8 independently regulates VPOS (up to +40V) and VNEG (down to −40V) using dedicated charge-pump circuits with separate drivers (DRVP/DRVN), supplies (SUPP/SUPN), and feedback inputs (FBP/FBN). Both outputs operate concurrently once their respective power-up conditions are met, with fault isolation preventing cross-rail interference.
What is the purpose of the INTG pin on MAX1779EUE+TGA8?
The INTG pin on MAX1779EUE+TGA8 provides access to the internal current integrator used to improve DC load regulation of the main boost converter. Connecting a 2200pF capacitor to GND enhances steady-state accuracy, while tying INTG to REF disables the integrator to reduce peak-to-peak transient voltage - a trade-off selected based on application stability vs. dynamic response needs.
Is MAX1779EUE+TGA8 compatible with ceramic output capacitors?
Yes, MAX1779EUE+TGA8 is fully compatible with low-ESR ceramic output capacitors due to its 250kHz current-mode PWM architecture and internal compensation. The datasheet explicitly recommends ceramic types for both main boost (C1/C2) and charge-pump (C3–C6) stages, enabling compact, low-profile designs without electrolytic or tantalum alternatives.
MAX1779EUE+TGA8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Applications:
- -
- Voltage - Input:
- -
- Number of Outputs:
- -
- Voltage - Output:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX1779EUE+TGA8 FAQ
1.How can I place an order for MAX1779EUE+TGA8 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1779EUE+TGA8 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 MAX1779EUE+TGA8 reliable?
The price and inventory of MAX1779EUE+TGA8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1779EUE+TGA8 is usually 5 days.
3.What payment methods are accepted for MAX1779EUE+TGA8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1779EUE+TGA8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1779EUE+TGA8?
MAX1779EUE+TGA8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1779EUE+TGA8 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 MAX1779EUE+TGA8?
For technical support, including MAX1779EUE+TGA8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1779EUE+TGA8 requirements.
6.How does Aetrix verify that MAX1779EUE+TGA8 is sourced from the original manufacturer or authorized distributors?
All MAX1779EUE+TGA8 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 MAX1779EUE+TGA8 meets industry standards.
7.What is the process for return or replacement of MAX1779EUE+TGA8?
All MAX1779EUE+TGA8 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1779EUE+TGA8, 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 MAX1779EUE+TGA8 part is unused and in its original packaging.
Return procedure for MAX1779EUE+TGA8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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