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Texas Instruments LM3311SQX/NOPB
- Part No.:
- LM3311SQX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LM3311SQX/NOPB.pdf
- Description:
- IC REG BOOST ADJ 2A 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,705
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Product details
Overview
LM3311SQX/NOPB from Texas Instruments is a highly integrated step-up DC/DC converter with embedded 2A/0.18Ω power switch, adjustable LDO (2.5–7V input, up to 300mA), rail-to-rail op-amp (135mA sink/source), and gate pulse modulation (GPM) switch for TFT LCD bias control. It operates from 2.5V to 7V input, delivers up to 20V boost output, and supports dual switching frequencies (660kHz or 1.28MHz) in a 24-pin WQFN package - used in portable TFT-LCD power management.
For engineers reviewing the LM3311SQX/NOPB datasheet, LM3311SQX/NOPB pinout, LM3311SQX/NOPB application, or LM3311SQX/NOPB equivalent, key selection considerations include its integrated GPM timing interface (VFLK/VDPM), LDO output adjustability via ADJ pin, soft-start programmability via SS capacitor, and thermal/UVLO protection thresholds confirmed across −40°C to +125°C junction range.
Technical Context
The LM3311SQX/NOPB implements a current-mode PWM boost regulator with internal 2A NMOS switch and 0.18Ω typical RDS(ON), enabling high-efficiency step-up conversion up to 20V. Its dual-frequency selection (660kHz/1.28MHz via FREQ pin) allows optimization of external inductor and capacitor size while maintaining stable regulation under load transients.
It integrates four functional blocks on-die: a boost controller with VC compensation node and FB feedback (1.263V reference), an LDO with ADJ-sensed output voltage, a rail-to-rail op-amp with 3.3MHz GBW and 50V/µs slew rate, and a dedicated GPM block accepting VFLK timing signals and driving VGHM with programmable RE/CE network - all sharing AGND/PGND with DAP thermal pad connection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Boost Output Range | Adjustable up to 20V via resistor divider on FB pin; 1.263V internal reference enables precise output setting. |
| Switch Current Limit | 2.0A minimum (typ. 2.6A); supports high-current inductor selection without external current sensing. |
| LDO Output Current | Up to 300mA at <674mV dropout (350mA load, 2.8V out); stable with ≥2.2µF ceramic output capacitor. |
| Op-Amp Output Drive | 135mA sink/source (standard version); sufficient for direct gate driving or analog signal conditioning in display bias rails. |
| GPM Input Voltage Range | VGH = 5V to 30V; enables compatibility with wide-range TFT panel gate drivers without level-shifting. |
| Thermal Protection | Activates at 145°C junction temperature with ~20°C hysteresis; disables all blocks (boost, LDO, op-amp, GPM) during shutdown. |
| Operating Temp Range | −40°C to +125°C junction; validated across full range for automotive infotainment and industrial portable displays. |
Pinout & Package
LM3311SQX/NOPB uses a 24-lead WQFN package (RTW0024A) with exposed thermal pad (DAP), θJA = 37°C/W. AGND and PGND must be directly connected to DAP for optimal thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Boost power switch node | Connects internal 2A NMOS drain to external inductor; requires low-inductance path to PGND. |
| FB | Boost output voltage feedback | 1.263V reference input; sets output via RFB1/RFB2 divider; high-impedance (27nA bias). |
| ADJ | LDO output voltage sense | 1.263V reference input; configures LDO output via RADJ1/RADJ2; 28nA bias current. |
| VGHM | GPM gate driver output | Drives external high-side PMOS gate; voltage follows VGH minus drop across internal VGHM-RE path. |
| VFLK | TFT on/off timing control | Accepts logic-level timing signal (0.4V/1.4V thresholds) from LCD timing controller to enable/disable GPM. |
| SS | Soft-start timing control | Charged by 11µA current source; CSS value sets startup ramp time (TSS = CSS × 1.24V / 11µA). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated GPM block | Eliminates need for discrete gate driver IC and timing logic; reduces BOM count and layout area in TFT bias supplies. |
| Adjustable soft-start | External capacitor on SS pin allows precise control of inrush current during power-up, preventing input rail collapse. |
| Dual-frequency selection | FREQ pin selects 660kHz (lower EMI, larger inductors) or 1.28MHz (smaller passives, faster transient response). |
| Rail-to-rail op-amp | Supports full-supply swing output with 135mA drive capability - usable as buffer, comparator, or active filter in analog subsystems. |
| Input UVLO with hysteresis | Enables reliable start-up only above 2.4V (on-threshold) and prevents oscillation near brown-out with 0.2V hysteresis (off-threshold = 2.2V). |
Applications
| TFT LCD Bias Supply | Portable Medical Display |
|---|---|
Use Scenario: Powering VGH/VGL rails in 7–10 inch TFT panels requiring 18–20V positive and −5 to −10V negative bias voltages. IC Role / Device Role / Timing Role: LM3311SQX/NOPB generates regulated VGH via boost converter and controls gate pulse timing via VFLK/VDPM interface synchronized to LCD controller. Use Value: Integrated GPM eliminates external driver IC and reduces component count by ≥3 parts while maintaining precise timing alignment. | Use Scenario: Compact battery-powered ultrasound or patient monitor with high-resolution color display and analog front-end signal conditioning. IC Role / Device Role / Timing Role: LM3311SQX/NOPB supplies regulated 3.3V LDO output for analog sensors and drives op-amp outputs for display backlight control and touch interface amplification. Use Value: Single-chip integration of boost, LDO, op-amp, and GPM reduces PCB area by >35% versus discrete solutions and improves system-level EMI performance. |
| Industrial Handheld Terminal | Automotive Infotainment Display |
Use Scenario: Ruggedized handheld HMI with sunlight-readable TFT and extended temperature operation (−30°C to +85°C ambient). IC Role / Device Role / Timing Role: LM3311SQX/NOPB provides robust 15V boost output with thermal shutdown and UVLO, while its op-amp buffers touchscreen ADC reference voltage. Use Value: −40°C to +125°C junction rating and 145°C thermal shutdown ensure reliable operation in uncontrolled thermal environments. | Use Scenario: In-vehicle navigation display requiring AEC-Q200-aligned power architecture and low-noise analog supply. IC Role / Device Role / Timing Role: LM3311SQX/NOPB delivers clean 5V LDO output for display timing controller and uses GPM block to synchronize gate pulses with vehicle CAN-triggered display wake-up. Use Value: Dual-frequency switching allows 660kHz operation to minimize conducted EMI in sensitive RF bands near AM/FM receivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail display power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65136RGER | Single-chip solution with dual boost + dual LDO + GPM; no integrated op-amp; fixed 1.2MHz switching. | Targeted specifically at AMOLED bias; lacks rail-to-rail op-amp for analog subsystem support. | Select when AMOLED panel timing and dual-rail generation dominate requirements over analog signal conditioning. |
| MAX17104ETL+ | Includes boost + LDO + GPM + op-amp but uses external MOSFET for high-current boost; 16-pin TQFN. | Requires external 2A switch and gate driver; higher BOM cost and layout complexity than fully integrated LM3311SQX/NOPB. | Select when thermal constraints require remote power switch placement or when legacy MAX17104 footprint compatibility is mandatory. |
Compared with TPS65136RGER and MAX17104ETL+, LM3311SQX/NOPB uniquely combines 2A integrated boost switch, rail-to-rail op-amp, and GPM in one 24-pin WQFN - offering lowest component count for TFT-LCD systems needing both analog signal support and precise gate timing control.
Availability
LM3311SQX/NOPB is available at Aetrix Electronics and suitable for TFT LCD bias supplies, portable medical displays, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LM3311SQX/NOPB 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 with emphasis on reliability, precision, and power efficiency.
The LM3311 product line targets integrated power management for portable display systems, combining boost conversion, linear regulation, analog signal conditioning, and TFT timing control into a single die to reduce system size and improve power integrity.
FAQ
What is the maximum boost output voltage supported by the LM3311SQX/NOPB?
The LM3311SQX/NOPB supports an adjustable boost output voltage up to 20V, set via a resistor divider on the FB pin using its internal 1.263V reference. This enables direct generation of standard TFT-LCD VGH voltages without external post-regulation, and the 2A/0.18Ω internal switch ensures stable operation even under high-current loads typical in display bias rails.
How does the LM3311SQX/NOPB implement gate pulse modulation for TFT displays?
The LM3311SQX/NOPB implements gate pulse modulation through dedicated pins: VFLK accepts timing signals from the LCD controller, VDPM enables/disables the GPM block, and VGHM drives the external high-side PMOS gate. With VGH input ranging from 5V to 30V and programmable RE/CE network, LM3311SQX/NOPB precisely controls gate pulse width and timing without external logic or drivers.
Can the op-amp in the LM3311SQX/NOPB drive capacitive loads such as LCD segment lines?
Yes, the op-amp in the LM3311SQX/NOPB is rated for rail-to-rail output swing and delivers 135mA sink/source current (standard version), making it suitable for driving moderate capacitive loads like LCD segment buffers or gamma correction DAC outputs. Its 3.3MHz gain-bandwidth and 50V/µs slew rate support stable operation with ≤100pF loads; for heavier capacitance, external isolation resistor is recommended per TI application notes.
What thermal protection features does the LM3311SQX/NOPB include?
The LM3311SQX/NOPB includes thermal shutdown that activates at 145°C junction temperature with ~20°C hysteresis. When triggered, it disables all functional blocks - boost converter, LDO, op-amp, and GPM - until die temperature falls below ~125°C. This protects against sustained overload or poor heatsinking, and the exposed DAP pad must be soldered to a thermal plane to maintain θJA = 37°C/W as specified.
Is the LM3311SQX/NOPB compatible with ceramic output capacitors for the LDO section?
Yes, the LM3311SQX/NOPB LDO is explicitly designed for stability with ceramic output capacitors as low as 2.2µF, eliminating the need for bulkier tantalum or aluminum electrolytic types. Its internal compensation ensures phase margin >60° across load currents from 0 to 300mA and input voltages from 2.5V to 7V, simplifying layout and improving transient response in space-constrained portable designs.
LM3311SQX/NOPB 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)
LM3311SQX/NOPB FAQ
1.How can I place an order for LM3311SQX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3311SQX/NOPB 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 LM3311SQX/NOPB reliable?
The price and inventory of LM3311SQX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3311SQX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3311SQX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3311SQX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3311SQX/NOPB?
LM3311SQX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3311SQX/NOPB 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 LM3311SQX/NOPB?
For technical support, including LM3311SQX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3311SQX/NOPB requirements.
6.How does Aetrix verify that LM3311SQX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3311SQX/NOPB 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 LM3311SQX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3311SQX/NOPB?
All LM3311SQX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3311SQX/NOPB, 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 LM3311SQX/NOPB part is unused and in its original packaging.
Return procedure for LM3311SQX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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