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Texas Instruments LM3311SQ-HIOP/NOPB
- Part No.:
- LM3311SQ-HIOP/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LM3311SQ-HIOP/NOPB.pdf
- Description:
- IC REG BOOST ADJ 2A 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,193
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Product details
Overview
LM3311SQ-HIOP/NOPB from Texas Instruments is a highly integrated step-up DC/DC converter with an integrated 2A, 0.18Ω NMOS switch, adjustable LDO (2.5–7V input, up to 300mA), rail-to-rail op-amp (HIOP version: ±200mA output, 50 V/µs slew rate), and gate pulse modulation (GPM) switch for TFT LCD bias control. It operates from 2.5V to 7V input and delivers boost output up to 20V in portable TFT-LCD power supplies.
For engineers reviewing the LM3311SQ-HIOP/NOPB datasheet, LM3311SQ-HIOP/NOPB pinout, LM3311SQ-HIOP/NOPB application, or LM3311SQ-HIOP/NOPB equivalent, key selection criteria include its dual-frequency switching (660kHz/1.28MHz), adjustable soft-start, integrated GPM timing interface (VFLK/VDPM), LDO output voltage programmability via ADJ pin, and thermal/UVLO protection - all in a 24-pin WQFN package.
Technical Context
The LM3311SQ-HIOP/NOPB implements a current-mode PWM boost controller with internal compensation (VC pin), selectable fixed-frequency operation (FREQ pin), and integrated protection blocks including undervoltage lockout (UVP) with 2.4V on-threshold and thermal shutdown at 145°C. Its GPM block accepts TTL-compatible VFLK timing signals and drives VGHM with programmable rise/fall via RE/CE components.
The HIOP variant features enhanced op-amp performance: ±200mA output current (typ), 50 V/µs slew rate, and 3.3MHz gain-bandwidth product - optimized for active load driving in LCD gate driver bias circuits. The LDO uses a 1.263V internal reference and supports ceramic output capacitors ≥2.2µF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Boost Switch Current Limit | 2.6A typical - enables robust 2A continuous output with margin for transient loads in TFT bias rails. |
| Switching Frequency | 660kHz or 1.28MHz (pin-selectable) - allows optimization of inductor size vs. efficiency in space-constrained portable designs. |
| Op-Amp Output Current (HIOP) | ±200mA typical - sufficient to directly drive gate driver charge pumps or high-capacitance LCD panel nodes without external buffers. |
| LDO Dropout Voltage | 409mV max at 350mA - ensures stable 2.8V output even with 3.3V LVIN supply under full load. |
| GPM VGH Input Range | 5V to 30V - compatible with standard TFT panel VGH supplies while enabling flexible external PMOS selection. |
| Feedback Reference Voltage | 1.263V (boost & LDO) - enables precise, resistor-divider-based output programming with <±0.4% tolerance over temperature. |
| Operating Junction Temp | −40°C to +125°C - qualified for industrial and automotive display module environments. |
Pinout & Package
LM3311SQ-HIOP/NOPB is housed in a 24-lead WQFN package (RTW0024A, 4mm × 4mm, 0.5mm pitch) with exposed thermal pad (DAP) internally connected to ground. AGND and PGND must be directly connected to the DAP for optimal thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 NC | No connect | Not internally bonded - leave unconnected or tie to ground per layout best practice. |
| 2 VGHM | GPM output | Drives gate driver circuitry; voltage follows VGH but modulated by VFLK/VDPM timing logic. |
| 3 VFLK | TFT on/off control | TTL-level input (1.4V/0.4V thresholds) synchronized to LCD timing controller for panel enable/disable sequencing. |
| 4 VDPM | GPM enable | Active-high digital enable for GPM block; used to coordinate power-up/down sequence with display controller. |
| 5 VDD | GPM reference | Sets lower VGHM clamp level; connect to VIN if GPM unused. |
| 6 AVIN | Op-amp supply | 4V–14V analog rail; decoupling required near pin to support 200mA HIOP output swing. |
| 7 OUT | Op-amp output | Rail-to-rail capable; drives external loads directly - no external buffer needed for typical LCD bias functions. |
| 8 NEG | Op-amp inverting input | Used for closed-loop regulation or signal inversion; low input bias (200nA typ) minimizes error. |
| 9 POS | Op-amp non-inverting input | Supports unity-gain follower or differential configurations; matched input impedance critical for precision biasing. |
| 10 AGND | Analog ground | Common return for boost, LDO, and op-amp; must be star-connected to DAP and PGND beneath device. |
| 11 ADJ | LDO feedback | Connects to resistor divider from VOUT to set regulated output voltage using 1.263V internal reference. |
| 12 VOUT | LDO output | Adjustable low-noise output (2.5–7V); stable with ≥2.2µF ceramic capacitor; supports 300mA load. |
| 13 LVIN | LDO input | 2.5V–7V supply input; separate from boost VIN to allow independent power domain management. |
| 14 SS | Soft-start control | External capacitor sets ramp time (TSS = CSS × 1.24V / 11µA); prevents inrush into large output caps. |
| 15 VC | Compensation node | Connects external RC network to stabilize boost loop; critical for phase margin in high-efficiency designs. |
| 16 FREQ | Frequency select | AGND = 660kHz, VIN = 1.28MHz - determines minimum off-time and inductor sizing constraints. |
| 17 VIN | Boost input | 2.5V–7V main supply; powers boost regulator, GPM, and internal logic; UVLO protects below 2.4V. |
| 18 SW | Switch node | Connects to inductor and catch diode; high dv/dt node - requires tight layout and ground plane clearance. |
| 19 SHDN | Shutdown control | Active-low logic input; pulls internal regulators and GPM block into ultra-low IQ state (<11µA). |
| 20 FB | Boost feedback | 1.263V reference node; resistor divider from VOUT sets boost output voltage with line/load regulation ≤0.42%/V. |
| 21 PGND | Power ground | High-current return for NMOS switch and GPM; must be low-inductance path to DAP and AGND. |
| 22 CE | GPM timing cap | Connects to AGND; sets VGHM rise/fall time with RE resistor - critical for EMI-controlled GPM transitions. |
| 23 RE | GPM timing resistor | Connects to PGND; forms RC filter with CE to shape VGHM edge rates per display timing requirements. |
| 24 VGH | GPM supply | 5V–30V high-voltage rail for GPM output stage; sourced externally to avoid boosting inefficiency. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated GPM block | Eliminates discrete gate driver ICs and external MOSFETs for TFT VGH control, reducing BOM count and PCB area. |
| HIOP op-amp variant | Delivers ±200mA output current and 50 V/µs slew rate - enables direct driving of high-capacitance LCD gate lines without buffering. |
| Pin-selectable frequency | 660kHz/1.28MHz selection allows trade-off between inductor size (smaller at 1.28MHz) and light-load efficiency (higher at 660kHz). |
| Adjustable LDO with ceramic stability | Regulates 2.5–7V outputs using only ≥2.2µF ceramic capacitors - avoids costly tantalum or electrolytic solutions. |
| Thermal & UVLO protection | Shuts down at 145°C (20°C hysteresis) and disables below 2.4V input - prevents damage during abnormal operating conditions. |
| 24-pin WQFN with DAP | 4mm × 4mm footprint with exposed thermal pad achieves θJA = 37°C/W - supports >1.5W continuous power dissipation in compact layouts. |
Applications
| TFT LCD Panel Bias Supply | Portable Display Power Management |
|---|---|
|
Use Scenario: Generating VGH (15–25V), VGL (−10V), and AVDD (3.3V/5V) rails for active-matrix TFT panels in handheld medical monitors and industrial HMIs. IC Role / Device Role / Timing Role: LM3311SQ-HIOP/NOPB serves as primary power hub: boost converter generates VGH, LDO supplies AVDD, op-amp buffers VCOM, and GPM synchronizes VGH pulses with display controller timing. Use Value: Single-chip integration reduces component count by ≥7 discrete parts versus multi-IC solutions, cutting board area by 35% and improving system-level EMI performance. |
Use Scenario: Powering color LCD modules in battery-powered barcode scanners, portable test equipment, and ruggedized field terminals. IC Role / Device Role / Timing Role: LM3311SQ-HIOP/NOPB manages battery-to-bias conversion: boost provides panel high-voltage rails, LDO powers microcontroller peripherals, op-amp drives touch-sensing circuits, and GPM enables dynamic panel power gating. Use Value: Adjustable soft-start and shutdown control extend battery life by eliminating inrush current and enabling deep-sleep modes with <11µA quiescent current. |
| Automotive Instrument Cluster Displays | Industrial Human-Machine Interface (HMI) |
|
Use Scenario: Supplying TFT backlight and gate driver voltages in automotive instrument clusters requiring AEC-Q200-compliant operation across −40°C to +125°C. IC Role / Device Role / Timing Role: LM3311SQ-HIOP/NOPB acts as display subsystem PMIC: boost delivers 18V VGH, LDO regulates 3.3V MCU I/O, op-amp conditions sensor signals, and GPM interfaces with vehicle CAN/LIN timing sync. Use Value: Built-in thermal shutdown and wide-junction-temp rating eliminate need for external thermal monitoring, simplifying functional safety compliance. |
Use Scenario: Powering high-resolution graphical displays in factory-floor HMIs where reliability, long-term availability, and ESD robustness are critical. IC Role / Device Role / Timing Role: LM3311SQ-HIOP/NOPB consolidates power functions: boost supplies 20V gate drivers, LDO powers FPGA configuration, op-amp drives analog front-end, and GPM coordinates with PLC scan cycles. Use Value: 2kV HBM ESD rating and 150°C absolute max junction temperature ensure resilience in electrically noisy industrial environments. |
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 |
|---|---|---|---|
| LM3311SQ/NOPB | Standard op-amp variant (±135mA output, 35 V/µs slew rate); identical boost/LDO/GPM functionality and pinout. | Lower drive capability suits smaller panels or less demanding timing margins; reduced thermal load at same output current. | Select when panel capacitance and timing requirements do not demand HIOP-level current/slew performance. |
| TPS65136RGER | Dual-output (positive/negative) charge pump + LDO; no integrated op-amp or GPM; 16-pin WQFN; 3.5V–5.5V input only. | Designed specifically for small-format LCDs (≤7") with fixed VGH/VGL; lacks programmable boost and timing interface. | Choose for cost-sensitive, low-power displays where GPM synchronization and high-current op-amp are unnecessary. |
Compared with LM3311SQ/NOPB, the LM3311SQ-HIOP/NOPB delivers 49% higher op-amp output current and 43% faster slew rate - critical for driving large-panel gate lines with minimal distortion. Versus TPS65136RGER, it offers wider input range, programmable boost voltage, and integrated timing control - enabling scalable designs across display sizes.
Availability
LM3311SQ-HIOP/NOPB is available at Aetrix Electronics and suitable for TFT LCD bias supplies, portable display power management, and industrial HMI applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LM3311SQ-HIOP/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 specializing in analog and embedded processing technologies, with decades of expertise in power management IC design and high-reliability manufacturing.
The LM3311 product line targets display power subsystems in portable and industrial electronics, integrating boost, LDO, op-amp, and GPM functions to replace multiple discrete components in TFT-LCD bias applications.
FAQ
What is the maximum output voltage achievable with the LM3311SQ-HIOP/NOPB boost converter?
The LM3311SQ-HIOP/NOPB boost converter supports an adjustable output voltage up to 20V, set via the FB pin and external resistor divider. Its internal 1.263V reference and 2A/0.18Ω switch enable stable high-voltage generation for TFT panel VGH rails while maintaining efficiency above 85% at typical loads.
How does the HIOP designation differentiate LM3311SQ-HIOP/NOPB from other LM3311 variants?
The HIOP suffix denotes the high-output-current op-amp variant of the LM3311SQ-HIOP/NOPB, featuring ±200mA output current (vs. ±135mA in standard versions), 50 V/µs slew rate, and 3.3MHz gain-bandwidth product - specifically engineered for driving high-capacitance LCD gate driver loads without external buffering.
Can the LM3311SQ-HIOP/NOPB operate without using the Gate Pulse Modulation (GPM) function?
Yes, the LM3311SQ-HIOP/NOPB can operate with GPM disabled: tie VDPM low and connect VDD to VIN. All other functions - boost converter, LDO, and op-amp - remain fully operational. The GPM block draws negligible current when disabled, preserving system efficiency in non-TFT applications.
What thermal management considerations apply to the LM3311SQ-HIOP/NOPB in high-power operation?
The LM3311SQ-HIOP/NOPB uses a 24-pin WQFN package with an exposed thermal pad (DAP) and θJA = 37°C/W. For continuous operation above 1.2W, solder the DAP to a ≥100mm² copper pour with ≥4 thermal vias to inner ground planes. AGND and PGND must be directly connected to the DAP to maintain safe junction temperatures below 125°C.
What is the purpose of the RE and CE pins on the LM3311SQ-HIOP/NOPB?
The RE and CE pins configure the Gate Pulse Modulation (GPM) block timing on the LM3311SQ-HIOP/NOPB: RE connects to PGND and CE to AGND, forming an RC network that shapes VGHM rise/fall times. This allows precise control of GPM edge rates to meet display timing specifications and minimize EMI in sensitive LCD systems.
LM3311SQ-HIOP/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)
LM3311SQ-HIOP/NOPB FAQ
1.How can I place an order for LM3311SQ-HIOP/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3311SQ-HIOP/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 LM3311SQ-HIOP/NOPB reliable?
The price and inventory of LM3311SQ-HIOP/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3311SQ-HIOP/NOPB is usually 5 days.
3.What payment methods are accepted for LM3311SQ-HIOP/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3311SQ-HIOP/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3311SQ-HIOP/NOPB?
LM3311SQ-HIOP/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3311SQ-HIOP/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 LM3311SQ-HIOP/NOPB?
For technical support, including LM3311SQ-HIOP/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3311SQ-HIOP/NOPB requirements.
6.How does Aetrix verify that LM3311SQ-HIOP/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3311SQ-HIOP/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 LM3311SQ-HIOP/NOPB meets industry standards.
7.What is the process for return or replacement of LM3311SQ-HIOP/NOPB?
All LM3311SQ-HIOP/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3311SQ-HIOP/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 LM3311SQ-HIOP/NOPB part is unused and in its original packaging.
Return procedure for LM3311SQ-HIOP/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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