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Analog Devices Inc./Maxim Integrated MAX17112ETB+T
- Part No.:
- MAX17112ETB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Management - Specialized
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX17112ETB+T.pdf
- Description:
- IC CONV DC-DC STEP UP 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,008
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Product details
Overview
MAX17112ETB+T from Maxim Integrated is a high-performance, current-mode, fixed-frequency (1MHz) step-up DC-DC converter with integrated n-channel MOSFET, designed to generate regulated 15V/600mA output for TFT-LCD bias supplies from 2.6V–5.5V input. It features input overvoltage protection up to 24V, programmable soft-start, and thermal-overload protection - deployed in notebook computer displays and LCD monitor panels.
For engineers reviewing the MAX17112ETB+T datasheet, MAX17112ETB+T pinout, MAX17112ETB+T application, or MAX17112ETB+T equivalent, key selection considerations include its 1MHz switching frequency enabling ultra-small 2.7μH inductors, adjustable 20V max output, 3.2A LX RMS current rating, and TDFN-EP (3mm × 3mm) package with exposed thermal pad.
Technical Context
The MAX17112ETB+T employs a current-mode PWM architecture with slope compensation to ensure stability at high duty cycles (>89%), enabling fast transient response to pulsed loads typical in LCD gate driver sequencing. Its error amplifier compares FB voltage (1.24V nominal) against a precision reference and drives COMP to modulate peak inductor current via internal current-sense transresistance (0.09–0.25 V/A).
Input overvoltage protection operates via an internal IN-to-VL switch that disconnects IC supply when VIN exceeds 6.6V (typ), while VL undervoltage lockout (2.45V rising threshold, 50mV hysteresis) ensures reliable startup only above minimum operating voltage. Soft-start is implemented by charging SS pin at 4μA to control ramp rate of peak inductor current until VSS reaches 1.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1MHz fixed - enables use of 2.7μH inductors and low-ESR ceramic output capacitors, reducing board area and EMI filtering burden. |
| Input Voltage Range | 2.6V to 5.5V (for VOUT ≤ 18V); 4.0V to 5.5V (for 18V < VOUT < 20V) - supports single-cell Li-ion or 3.3V/5V system rails. |
| Output Voltage Range | Adjustable from VIN to 20V - configured via external resistor divider on FB pin; supports common TFT-LCD VGH (15–18V) and AVDD (5–8V) rails. |
| LX Switch Current Limit | 3.9A to 5.3A (at 75% duty cycle, VL = 5V) - sets maximum deliverable output current based on input/output ratio and efficiency. |
| OVP Threshold | 6.2V to 7.0V (rising VIN) - protects internal circuitry during input surge events without requiring external clamping components. |
| Thermal Shutdown | Activates at +150°C junction temperature with 20°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
| Quiescent Current | 0.6mA (non-switching, VFB = 1.3V); 2.5mA (switching, VFB = 1.0V) - minimizes standby power loss in battery-powered display subsystems. |
Pinout & Package
MAX17112ETB+T is housed in a 10-pin, 3mm × 3mm Thin Dual Flat No-lead package with exposed thermal pad (TDFN-EP). The exposed pad (EP) must be soldered to a PCB thermal plane for effective heat dissipation and optimal transient performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (COMP) | Compensation node for error amplifier | Connects external RC network (e.g., 47kΩ + 560pF) to set loop bandwidth and phase margin; critical for stability with low-ESR ceramic output capacitors. |
| 2 (FB) | Feedback input | Senses output voltage via resistor divider; regulation point is 1.24V ±1.5mV - determines final VOUT accuracy and load/line regulation. |
| 3 (VL) | IC supply rail | Internally derived from IN via protected switch; bypassed with 1μF capacitor to GND; UVLO threshold is 2.45V with 50mV hysteresis. |
| 4,5 (GND) | Power ground terminals | Low-impedance return paths for high-current LX switching and analog reference; must connect directly to EP and separate PGND island. |
| 6,7 (LX) | Switch node (drain of internal MOSFET) | Carries high di/dt pulsed current; requires short, wide copper traces and minimal loop area to reduce EMI and voltage spikes. |
| 8 (IN) | Main input supply | Accepts 2.6V–5.5V; bypassed with ≥1μF ceramic capacitor placed adjacent to pin; OVP circuit monitors this node directly. |
| 9 (SHDN) | Enable/shutdown control | Logic-compatible input (1.19–1.29V threshold); internal 5μA charge current enables timed startup when capacitor is attached. |
| 10 (SS) | Soft-start timing control | Charged at 4μA to ramp peak inductor current; full current limit reached at VSS = 1.5V - prevents input inrush and output overshoot. |
| EP (Exposed Pad) | Thermal and electrical ground | Must be soldered to solid GND plane; provides primary thermal path and reduces junction-to-board thermal resistance to ~35°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 110mΩ n-channel MOSFET (VL = 5V) | Eliminates external high-side switch, reduces BOM count, and enables compact 3mm × 3mm layout for space-constrained LCD modules. |
| 1MHz fixed-frequency PWM | Permits use of sub-3μH shielded inductors and avoids AM radio band interference; supports tight output voltage regulation under dynamic load steps. |
| Programmable soft-start via SS pin | Prevents input current surges and output voltage overshoot during power-up; duration controlled by external capacitor value (e.g., 100nF ≈ 25ms). |
| Input overvoltage protection (OVP) | Auto-disconnects VL supply when VIN exceeds 6.6V - protects internal circuitry without external TVS diodes or crowbar circuits. |
| Thermal-overload and UVLO protection | Ensures safe operation across industrial temperature range (-40°C to +85°C); shutdown recovery occurs only after junction cools below 130°C. |
Applications
| Notebook Computer Displays | LCD Monitor Panels |
|---|---|
Use Scenario: Powering gate driver (VGH/VGL) and source driver (AVDD) rails in 13–15.6-inch notebook LCD panels with dynamic backlight dimming. IC Role / Device Role / Timing Role: Primary step-up converter generating stable 15V/600mA from 5V system rail; regulates during rapid load transients caused by row/column scanning. Use Value: 1MHz switching and current-mode control achieve <50mV output deviation during 50mA→550mA load steps (100μs/div), ensuring flicker-free image rendering. |
Use Scenario: Bias supply for 21.5–27-inch desktop LCD monitors requiring dual-rail outputs (18V VGH + 5.5V AVDD) with independent enable sequencing. IC Role / Device Role / Timing Role: High-efficiency boost stage delivering 18V @ 400mA; coordinated with secondary LDOs via SHDN-controlled power-up timing. Use Value: Input OVP (6.6V threshold) and thermal shutdown prevent field failures due to adapter overvoltage or enclosure airflow blockage. |
| Industrial HMI Displays | Medical Imaging Panel Supplies |
Use Scenario: Ruggedized human-machine interface displays in factory automation equipment operating across -30°C to +70°C ambient. IC Role / Device Role / Timing Role: Regulated 12V/500mA supply for TFT controller and touch IC; maintains regulation during 4.0V–5.5V brownout conditions. Use Value: VL UVLO (2.45V rising) with 50mV hysteresis prevents erratic restarts during unstable 5V bus conditions in noisy industrial environments. |
Use Scenario: Powering high-resolution diagnostic LCD panels in ultrasound and MRI consoles where EMI and reliability are critical. IC Role / Device Role / Timing Role: Low-noise, fixed-frequency boost converter feeding downstream low-dropout regulators for analog front-end biasing. Use Value: COMP pin allows loop tuning to suppress switching noise coupling into sensitive analog signal paths (<10mVpp ripple measured at 15V output). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61088RHLR | Higher 2.2MHz switching frequency; 13.2V max output; no integrated OVP; requires external MOSFET for >12V outputs. | Optimized for portable electronics with tighter size constraints; lacks input surge protection needed in panel-integrated designs. | Select when board space is critical and input voltage is tightly regulated; verify external OVP implementation if used in unregulated adapter-fed systems. |
| LT3467EDD#TRPBF | 1.3MHz frequency; 36V max output; external MOSFET required; no soft-start pin; uses different compensation topology. | Better suited for high-voltage industrial bias rails (e.g., 28V VGH); lacks integrated soft-start and OVP, increasing design complexity. | Choose for >20V output requirements or when discrete MOSFET selection is preferred for thermal management flexibility. |
Compared with TPS61088RHLR and LT3467EDD#TRPBF, the MAX17112ETB+T delivers integrated OVP, programmable soft-start, and 20V capability in a single 3mm × 3mm package - reducing component count and validation effort for TFT-LCD power stages.
Availability
MAX17112ETB+T is available at Aetrix Electronics and suitable for notebook computer displays, LCD monitor panels, and industrial HMI displays requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX17112ETB+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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and consumer applications.
The MAX17112ETB+T belongs to Maxim's TFT-LCD power management product line, engineered specifically to replace discrete boost solutions in display bias supplies - emphasizing integration, protection, and layout simplicity for panel manufacturers.
FAQ
What is the maximum output voltage supported by the MAX17112ETB+T?
The MAX17112ETB+T supports an adjustable output voltage range from VIN up to 20V. This is achieved using an external resistor divider connected to the FB pin, with the feedback reference voltage precisely trimmed to 1.24V ±1.5mV. Output voltages above 18V require minimum input voltage of 4.0V per datasheet specifications.
Does the MAX17112ETB+T include built-in overvoltage protection?
Yes, the MAX17112ETB+T integrates input overvoltage protection (OVP) that disables the internal IN-to-VL supply switch when VIN exceeds 6.6V (typical threshold). This protects the IC from damage during input surge events up to 24V without requiring external TVS diodes or crowbar circuits.
How is soft-start implemented on the MAX17112ETB+T?
Soft-start on the MAX17112ETB+T is controlled via the SS pin, which is charged at a constant 4μA current. The rising SS voltage linearly scales the peak inductor current limit until VSS reaches 1.5V, at which point full output current capability is enabled. An external capacitor (e.g., 100nF) sets the soft-start duration to approximately 25ms.
What package type and thermal characteristics does the MAX17112ETB+T use?
The MAX17112ETB+T uses a 10-pin TDFN-EP package (3mm × 3mm) with an exposed thermal pad. When properly soldered to a 4-layer PCB with 1-in² copper pour, its junction-to-board thermal resistance is ~35°C/W, supporting continuous 600mA output at +85°C ambient without derating.
Can the MAX17112ETB+T operate with input voltages below 2.6V?
No, the MAX17112ETB+T has a guaranteed operational input range of 2.6V to 5.5V for outputs ≤18V. Below 2.6V, the internal VL supply falls below its 2.45V undervoltage lockout threshold, disabling the regulator. Operation outside this range may result in undefined behavior or failure to start.
What is the purpose of the COMP pin on the MAX17112ETB+T?
The COMP pin on the MAX17112ETB+T serves as the error amplifier output node for loop compensation. Connecting an external RC network (e.g., 47kΩ + 560pF) sets the dominant pole and zero to stabilize the control loop, especially critical when using low-ESR ceramic output capacitors and maintaining fast transient response.
MAX17112ETB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- LCD Monitor, Notebook Display
- Current - Supply:
- -
- Voltage - Supply:
- 2.6V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN (3x3)
MAX17112ETB+T FAQ
1.How can I place an order for MAX17112ETB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17112ETB+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 MAX17112ETB+T reliable?
The price and inventory of MAX17112ETB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17112ETB+T is usually 5 days.
3.What payment methods are accepted for MAX17112ETB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17112ETB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17112ETB+T?
MAX17112ETB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17112ETB+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 MAX17112ETB+T?
For technical support, including MAX17112ETB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17112ETB+T requirements.
6.How does Aetrix verify that MAX17112ETB+T is sourced from the original manufacturer or authorized distributors?
All MAX17112ETB+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 MAX17112ETB+T meets industry standards.
7.What is the process for return or replacement of MAX17112ETB+T?
All MAX17112ETB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17112ETB+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 MAX17112ETB+T part is unused and in its original packaging.
Return procedure for MAX17112ETB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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