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Texas Instruments LM3310SQX
- Part No.:
- LM3310SQX
- Manufacturer:
- Texas Instruments
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LM3310SQX.pdf
- Description:
- IC REG BOOST ADJ 2A 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,051
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Product details
Overview
LM3310SQX from Texas Instruments is a step-up PWM DC/DC converter with integrated op-amp and gate pulse modulation (GPM) switch, designed for TFT-LCD bias supply generation. It delivers up to 2A output current with 0.18Ω internal NMOS switch, supports adjustable boost output up to 20V, operates from 2.5V–7V input, and features selectable 660kHz/1.28MHz switching frequency.
For engineers reviewing the LM3310SQX datasheet, LM3310SQX pinout, LM3310SQX application, or LM3310SQX equivalent, this page provides verified technical context, validated pin functions, confirmed GPM timing interface behavior, real-world soft-start implementation guidance, and cross-referenced alternatives for TFT-LCD power architectures.
Technical Context
The LM3310SQX integrates three functional blocks: a current-mode PWM boost regulator with internal 2A/0.18Ω NMOS switch, a rail-to-rail op-amp capable of ±135mA output, and a dedicated GPM block that modulates VGHM using VFLK and VDPM control signals. Its error amplifier transconductance is 26–133 µmho, and maximum duty cycle reaches 91% at 660kHz.
Switching frequency is selected via FREQ pin (AGND = 660kHz, VIN = 1.28MHz), and soft-start is externally programmable via SS pin current (11 µA typ) and clamp voltage (1.24V). The GPM block accepts VGH input from 5V to 30V and drives VGHM with PMOS switches exhibiting 14–28.5Ω on-resistance under 20mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Boost Output Range | Adjustable up to 20V via FB resistor divider; feedback voltage fixed at 1.263V. |
| Switch Current Limit | 2.6A typical; enables reliable operation into high-capacitance TFT panel loads without current foldback. |
| Switching Frequency | Selectable 660kHz or 1.28MHz; allows optimization between inductor size and efficiency in portable designs. |
| Op-Amp Output Current | ±135mA sink/source; sufficient to drive gate lines directly in medium-size TFT panels without external buffers. |
| GPM VGH Input Range | 5V to 30V; compatible with discrete 2×/3× charge pumps used in LCD bias rails. |
| Soft-Start Control | SS pin draws 11 µA typ; soft-start time set by CSS × 1.24V / 11 µA - enables precise inrush current limiting. |
| Thermal Shutdown | Activates at 145°C with ~20°C hysteresis; disables all blocks (boost, op-amp, GPM) to prevent damage during overload. |
Pinout & Package
LM3310SQX is housed in a thermally enhanced 24-lead WQFN package (RTW0024A) with exposed die attach pad (DAP) connected internally to ground. AGND and PGND must be connected directly to DAP for optimal thermal and noise performance. θJA = 37°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Boost & GPM power input | Primary input for boost converter and GPM circuit; 2.5V–7V operating range. |
| SW | Power switch node | Connects internal NMOS drain to external inductor; max 20V swing. |
| FB | Output voltage feedback | Senses regulated output via resistor divider; reference voltage = 1.263V. |
| SS | Soft-start control | External capacitor sets startup ramp rate; 11 µA current source charges CSS to 1.24V. |
| FREQ | Frequency select | Ground = 660kHz, connect to VIN = 1.28MHz; determines minimum off-time and inductor sizing. |
| SHDN | Shutdown enable | Active-low logic input; pulls low to disable all internal blocks including op-amp and GPM. |
| AVIN | Op-amp analog supply | 4V–14V input for op-amp; requires local ceramic bypass to AGND for ripple rejection. |
| POS/NEG/OUT | Op-amp terminals | Differential inputs and rail-to-rail output; supports unity-gain buffer or gain configurations. |
| VGH/VGHM/VDPM/VFLK | GPM control interface | VGH supplies GPM; VGHM is modulated output; VDPM enables GPM; VFLK controls on/off timing. |
| PGND/AGND | Power & analog ground | Must be shorted and connected directly to DAP; separation causes noise coupling and instability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A/0.18Ω NMOS switch | Reduces external component count and PCB area; enables >90% efficiency at 500mA load with 3.3V→8.5V boost. |
| Pin-selectable 660kHz/1.28MHz switching | Allows trade-off between small magnetics (1.28MHz) and higher light-load efficiency (660kHz). |
| Programmable soft-start via SS pin | Prevents inrush current into large panel capacitance; eliminates need for external timers or RC networks. |
| Dedicated GPM block with VFLK/VDPM interface | Directly implements TFT timing sequences without MCU intervention; supports standard LCD timing controller protocols. |
| Rail-to-rail op-amp with ±135mA drive | Drives gate lines without external buffers; eliminates level-shifter requirements in compact display modules. |
Applications
| TFT-LCD Gate Driver Bias | Portable Display Power Management |
|---|---|
Use Scenario: Generating positive high-voltage gate-on (VGH) and negative gate-off (VGL) rails for active-matrix LCD panels in handheld devices. IC Role / Device Role / Timing Role: LM3310SQX acts as primary boost converter for VGH, while its integrated GPM block modulates VGHM in sync with VFLK timing signal from display controller. Use Value: Eliminates discrete charge pump and timing logic; reduces BOM count by ≥4 components and saves >15mm² PCB area. | Use Scenario: Powering dual-rail TFT bias supplies in battery-powered medical monitors and industrial HMIs with strict inrush limits. IC Role / Device Role / Timing Role: LM3310SQX delivers regulated VGH and uses its op-amp to generate precision VCOM reference, synchronized to display frame rate. Use Value: Single-chip solution replaces separate boost IC + op-amp + timing IC; soft-start prevents battery sag during cold start. |
| Automotive Infotainment Displays | Industrial Panel PC Backlight & Bias |
Use Scenario: Providing stable VGH and VGL for automotive-grade 7"–10" LCD clusters operating across −40°C to +125°C junction temperature. IC Role / Device Role / Timing Role: LM3310SQX regulates VGH from 5V system rail, while GPM block interfaces directly with automotive timing controller via VFLK/VDPM pins. Use Value: Built-in UVLO (2.4V on-threshold) and thermal shutdown ensure fail-safe operation during cold cranking or thermal overload. | Use Scenario: Biasing high-resolution industrial LCDs requiring precise VCOM and fast transient response during video content changes. IC Role / Device Role / Timing Role: LM3310SQX boost stage powers VGH rail; its op-amp buffers and filters VCOM reference with <15mV offset over temperature. Use Value: Integrated op-amp avoids external precision amplifier; rail-to-rail output ensures full VCOM swing across 0–14V AVIN range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TFT-LCD bias supply applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65136RGER | Single-channel boost + dual LDO; no integrated op-amp or GPM; 1.2MHz fixed frequency; 1.5A switch. | Requires external op-amp for VCOM and discrete timing logic for GPM; suited for simpler displays without dynamic VGH modulation. | Select when GPM functionality is unnecessary and board space permits discrete op-amp + timing IC. |
| MAX17105ETL+ | Triple-output (VGH/VGL/VCOM); includes integrated op-amp but no GPM; 2.2MHz switching; 2.5A switch. | Lacks VFLK/VDPM interface; VGH modulation requires external FPGA or MCU; better for static bias rails. | Select when VGH modulation is handled elsewhere and triple-output integration outweighs missing GPM. |
Compared with TPS65136RGER and MAX17105ETL+, LM3310SQX uniquely combines boost regulation, rail-to-rail op-amp, and hardware-based GPM in one WQFN package-enabling direct timing-controller interfacing and eliminating four external components in TFT-LCD bias designs.
Availability
LM3310SQX is available at Aetrix Electronics and suitable for TFT-LCD bias supplies, portable display power management, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LM3310SQX 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
Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LM3310SQX belongs to TI's display power management IC family, engineered specifically for integrated TFT-LCD bias generation with hardware-timed gate pulse modulation and panel-driving op-amp capability.
FAQ
What is the recommended soft-start capacitor value for LM3310SQX in a 3.3V-to-12V TFT bias application?
For a 3.3V-to-12V application, use a 100nF ceramic capacitor on the SS pin. With ISS = 11 µA and VSS = 1.24V, this yields ~11.3ms soft-start time - sufficient to limit inrush into typical 10–50µF panel capacitance without delaying display initialization. Larger values increase ramp time linearly; smaller values risk overshoot.
Can LM3310SQX operate without connecting the VDD pin when GPM is not used?
Yes. When the GPM function is disabled, TI specifies that VDD must be connected to VIN. Leaving VDD unconnected or floating violates absolute maximum ratings and may cause undefined GPM block behavior. Connecting VDD to VIN ensures proper internal reference setting and avoids latch-up risk.
How does the LM3310SQX handle thermal overload during sustained VGH output current demand?
When junction temperature reaches 145°C, LM3310SQX enters thermal shutdown, disabling the boost converter, op-amp, and GPM blocks simultaneously. It remains off until temperature drops ~20°C, then resumes operation. This protects against permanent damage during sustained overloads such as shorted panel traces or excessive ambient temperature.
What is the maximum allowable VGH voltage when using the GPM block in LM3310SQX?
The absolute maximum VGH voltage is 31V, but the recommended operating range is 5V to 30V per the Electrical Characteristics table. Exceeding 30V risks exceeding the 20mA test condition for VGH-to-VGHM resistance and may degrade long-term reliability of the internal PMOS switches in the GPM block.
Does LM3310SQX require external compensation for its integrated op-amp when driving a standard TFT-LCD panel?
Not always. If the panel presents ≥50Ω in series with ≥4.7nF at the op-amp output, the panel itself provides adequate phase margin and no external compensation is needed. Otherwise, add a 50Ω resistor in series with a 4.7nF capacitor from OUT to AGND - this ensures stability across zero-to-infinite capacitive loads and prevents oscillation-induced power waste.
LM3310SQX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 7V
- Voltage - Output (Min/Fixed):
- 1.263V
- Voltage - Output (Max):
- 20V
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 660kHz, 1.28MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-WQFN (4x4)
LM3310SQX FAQ
1.How can I place an order for LM3310SQX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3310SQX 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 LM3310SQX reliable?
The price and inventory of LM3310SQX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3310SQX is usually 5 days.
3.What payment methods are accepted for LM3310SQX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3310SQX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3310SQX?
LM3310SQX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3310SQX 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 LM3310SQX?
For technical support, including LM3310SQX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3310SQX requirements.
6.How does Aetrix verify that LM3310SQX is sourced from the original manufacturer or authorized distributors?
All LM3310SQX 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 LM3310SQX meets industry standards.
7.What is the process for return or replacement of LM3310SQX?
All LM3310SQX units undergo pre-shipment inspection (PSI). If there is an issue with LM3310SQX, 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 LM3310SQX part is unused and in its original packaging.
Return procedure for LM3310SQX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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