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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Texas Instruments LM3311SQ-HIOP

Name: LM3311SQ-HIOP
Brand: Texas Instruments
SKU: LM3311SQ-HIOP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM3311SQ-HIOP

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 24-WFQFN Exposed Pad

Datasheet:: LM3311SQ-HIOP.pdf

Description:: IC REG BOOST ADJ 2A 24WQFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LM3311SQ-HIOP from Texas Instruments is a highly integrated step-up DC/DC converter with an on-chip 2A, 0.18Ω NMOS switch, adjustable LDO (2.5–7V input, up to 300mA), rail-to-rail op-amp (HIOP version: 215mA source / 205mA sink), and gate pulse modulation (GPM) switch for TFT LCD bias control. It operates from 2.5V to 7V input and delivers up to 20V boost output in portable TFT-LCD power supplies.

For engineers reviewing the LM3311SQ-HIOP datasheet, LM3311SQ-HIOP pinout, LM3311SQ-HIOP application, or LM3311SQ-HIOP equivalent, key selection considerations include its dual-frequency switching (660kHz/1.28MHz), integrated GPM timing interface (VFLK/VDPM), HIOP op-amp current capability, soft-start programmability, and 24-pin WQFN thermal performance (θ_JA = 37°C/W).

Technical Context

The LM3311SQ-HIOP implements a current-mode PWM boost controller with internal compensation (VC pin), selectable fixed-frequency operation via FREQ pin, and independent shutdown (SHDN) and soft-start (SS) control. Its GPM block accepts VFLK timing signals and modulates VGHM output using external RE/CE components to drive TFT gate drivers.

The HIOP variant features enhanced op-amp sourcing/sinking capability (215mA/205mA typ.), lower input offset voltage (5.7mV), and higher supply current (2.5–9mA) versus the standard version - all verified across −40°C to +125°C junction temperature range. The LDO uses ADJ feedback with 1.263V reference and supports ceramic capacitors ≥2.2µF.

Key Specifications

Parameter	Value and Actual Design Meaning
Boost Switch Current Limit	2.0A min - supports high-current inductor charging for fast transient response in LCD bias rails
Switching Frequency	660kHz or 1.28MHz selectable - enables optimization of size (higher f_S) vs. efficiency (lower f_S)
Op-Amp Output Current (HIOP)	215mA source / 205mA sink typ. - drives high-capacitance TFT gate lines without external buffers
LDO Dropout Voltage	218mV at 350mA - maintains regulation under tight input-output margins in battery-powered systems
GPM VGH Input Range	5V to 30V - compatible with standard TFT panel VGH supplies and supports wide-panel scaling
Feedback Reference Voltage	1.263V ±0.03V - sets precise boost and LDO output voltages using resistor dividers
Operating Junction Temp	−40°C to +125°C - qualified for industrial and automotive display modules

Pinout & Package

LM3311SQ-HIOP 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 directly tied to DAP for optimal thermal and noise performance.

Pin/Terminal	Circuit Role	Design Meaning
1 NC	No connect	Not internally bonded - leave unconnected or grounded per layout best practice
2 VGHM	GPM output	Drives gate driver supply; voltage follows VGH minus PMOS R_DS(on) drop
3 VFLK	TFT on/off timing	Accepts logic-level signal from timing controller to enable/disable GPM output
4 VDPM	GPM enable	High = GPM active; low = GPM disabled - used for sequencing control
5 VDD	GPM reference	Sets lower VGHM clamp level; tie to VIN if GPM unused
6 AVIN	Op-amp analog supply	4V–14V input - powers HIOP op-amp independently from boost/LDO domains
7 OUT	Op-amp output	Rail-to-rail swing; capable of 215mA sourcing into capacitive loads
8 NEG	Op-amp inverting input	Used for closed-loop gain configuration or comparator applications
9 POS	Op-amp non-inverting input	Supports buffer, amplifier, or sensing configurations with rail-to-rail common-mode range
10 AGND	Analog ground	Reference for boost regulator, LDO, and op-amp - connect directly to DAP
11 ADJ	LDO feedback	1.263V reference node - sets LDO output voltage via external resistor divider
12 VOUT	LDO output	Adjustable 1.2V–LVIN; stable with ≥2.2µF ceramic output capacitor
13 LVIN	LDO input	2.5V–7V supply - may be fed from boost output or separate rail
14 SS	Soft-start control	External capacitor sets ramp time: T_SS ≈ C_SS × 1.24V / 11µA
15 VC	Compensation node	Connects to error amplifier output - used for loop stability tuning
16 FREQ	Frequency select	AGND = 660kHz; VIN = 1.28MHz - determines minimum external component size
17 VIN	Boost/GPM input	Main power input for boost converter and GPM circuitry (2.5V–7V)
18 SW	Switch node	Connects to inductor and catch diode - high dv/dt node requiring careful layout
19 SHDN	Shutdown control	Active-low; pulls internal regulators and GPM into ultra-low-I_Q state (<11µA)
20 FB	Boost feedback	1.263V reference - sets boost output via resistor divider from VOUT
21 PGND	Power ground	Source of NMOS switch and GPM ground - tie to DAP with low-inductance path
22 CE	GPM timing capacitor	Connects to AGND; sets VGHM rise/fall time with RE resistor
23 RE	GPM timing resistor	Connects between RE and PGND; defines GPM pulse width with CE
24 VGH	GPM high-voltage supply	5V–30V input - powers GPM output stage and determines VGHM swing range

Key Features

Feature	Design Value
Integrated GPM block	Replaces discrete charge-pump + MOSFET timing circuits for TFT gate drivers, reducing BOM count and layout area
HIOP op-amp variant	Delivers 215mA sourcing capability - sufficient to drive full-segment gate lines in medium-size TFT panels without buffering
Adjustable soft-start	Programmable inrush current limiting via external SS capacitor - prevents input voltage sag during startup
Dual-frequency selection	660kHz/1.28MHz pin-selectable switching - enables trade-off between efficiency (low f_S) and component size (high f_S)
Thermal shutdown with hysteresis	145°C trip with ~20°C hysteresis - protects device during overload or poor heatsinking while enabling auto-recovery
Ceramic-capacitor compatible LDO	Stable with ≥2.2µF X5R/X7R output caps - eliminates need for bulky tantalum or electrolytic capacitors

Applications

TFT LCD Bias Supply	Portable Display Power Management
Use Scenario: Generating VGH (15–25V) and VGL (−5 to −10V) rails for active-matrix TFT-LCD panels in handheld devices. IC Role / Device Role / Timing Role: LM3311SQ-HIOP serves as primary boost converter for VGH, LDO for AVDD, op-amp for gamma correction, and GPM for gate line timing control. Use Value: Single-chip integration eliminates four discrete ICs, reduces PCB area by >40%, and ensures synchronized startup via shared SS and SHDN control.	Use Scenario: Powering display subsystems in battery-operated medical monitors, barcode scanners, and ruggedized PDAs. IC Role / Device Role / Timing Role: LM3311SQ-HIOP provides regulated boost output, low-noise analog supply (LDO), precision gamma buffer (HIOP op-amp), and sequenced gate driving (GPM). Use Value: Ultra-low quiescent current in shutdown (<11µA), wide input range (2.5–7V), and −40°C to +125°C operation ensure reliable runtime and field robustness.
Industrial HMI Displays	Automotive Infotainment Panels
Use Scenario: Driving 7–10 inch industrial human-machine interface displays in factory automation equipment. IC Role / Device Role / Timing Role: LM3311SQ-HIOP delivers stable VGH/VGL with precise GPM timing alignment to timing controller signals (VFLK/VDPM). Use Value: Robust ESD protection (2kV HBM), thermal shutdown, and input UVLO prevent latch-up or damage during voltage transients in noisy plant environments.	Use Scenario: Supporting AEC-Q200-compliant display modules in vehicle infotainment systems with strict EMC and thermal requirements. IC Role / Device Role / Timing Role: LM3311SQ-HIOP functions as display power SoC - managing boost, analog bias, gamma amplification, and gate pulse generation in one package. Use Value: 24-pin WQFN with DAP enables direct thermal coupling to heatsink; 37°C/W θ_JA supports continuous 1.28MHz operation at ambient up to 85°C.

TFT LCD Bias Supply

Portable Display Power Management

Use Scenario: Generating VGH (15–25V) and VGL (−5 to −10V) rails for active-matrix TFT-LCD panels in handheld devices.

IC Role / Device Role / Timing Role: LM3311SQ-HIOP serves as primary boost converter for VGH, LDO for AVDD, op-amp for gamma correction, and GPM for gate line timing control.

Use Value: Single-chip integration eliminates four discrete ICs, reduces PCB area by >40%, and ensures synchronized startup via shared SS and SHDN control.

Use Scenario: Powering display subsystems in battery-operated medical monitors, barcode scanners, and ruggedized PDAs.

IC Role / Device Role / Timing Role: LM3311SQ-HIOP provides regulated boost output, low-noise analog supply (LDO), precision gamma buffer (HIOP op-amp), and sequenced gate driving (GPM).

Use Value: Ultra-low quiescent current in shutdown (<11µA), wide input range (2.5–7V), and −40°C to +125°C operation ensure reliable runtime and field robustness.

Industrial HMI Displays

Automotive Infotainment Panels

Use Scenario: Driving 7–10 inch industrial human-machine interface displays in factory automation equipment.

IC Role / Device Role / Timing Role: LM3311SQ-HIOP delivers stable VGH/VGL with precise GPM timing alignment to timing controller signals (VFLK/VDPM).

Use Value: Robust ESD protection (2kV HBM), thermal shutdown, and input UVLO prevent latch-up or damage during voltage transients in noisy plant environments.

Use Scenario: Supporting AEC-Q200-compliant display modules in vehicle infotainment systems with strict EMC and thermal requirements.

IC Role / Device Role / Timing Role: LM3311SQ-HIOP functions as display power SoC - managing boost, analog bias, gamma amplification, and gate pulse generation in one package.

Use Value: 24-pin WQFN with DAP enables direct thermal coupling to heatsink; 37°C/W θ_JA supports continuous 1.28MHz operation at ambient up to 85°C.

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	Standard op-amp variant: 135mA source / 135mA sink, higher V_OS (15mV), lower I_Q (1.5–7.8mA)	Lower drive strength limits use to smaller panels (<5") or buffered gate drivers	Select LM3311SQ when panel gate capacitance and current demand are below HIOP thresholds and cost sensitivity is high
TPS65136QRGER	Dual-output (VPOS/VNEG) charge-pump + LDO; no integrated op-amp or GPM; 16-pin WQFN	Requires external op-amp and timing logic for TFT gate control; lacks single-chip GPM functionality	Choose TPS65136QRGER when only dual-rail bias is needed and system already includes dedicated gamma buffer and timing controller

Compared with LM3311SQ-HIOP, the standard LM3311SQ trades op-amp drive strength for lower quiescent current, while TPS65136QRGER offers simpler dual-rail generation but requires additional components to replicate HIOP's integrated TFT timing and analog functions - making LM3311SQ-HIOP the only single-package solution for full TFT power + timing + gamma control.

Availability

LM3311SQ-HIOP 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 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, embedded processing, and power management technologies, with decades of experience in display power solutions.

The LM3311 product line was designed specifically for integrated TFT-LCD power management - combining boost conversion, LDO regulation, precision op-amp buffering, and gate pulse modulation in a single WQFN package to simplify display subsystem design.

FAQ

What is the maximum boost output voltage supported by the LM3311SQ-HIOP?

The LM3311SQ-HIOP supports an adjustable boost output voltage up to 20V, set via the FB pin and external resistor divider. This is confirmed in the datasheet's Features section and Electrical Characteristics table, where V_OUT is specified as "adjustable up to 20V". The internal 1.263V feedback reference enables precise scaling across the full range using standard resistor values.

How does the HIOP designation differentiate LM3311SQ-HIOP from other LM3311 variants?

The HIOP designation identifies the high-output-current op-amp variant of the LM3311SQ-HIOP, featuring 215mA sourcing and 205mA sinking capability (typical), compared to 135mA/135mA for the standard version. This is explicitly stated in the "Integrated Op-Amp" feature bullet and verified in the Electrical Characteristics table under "I_OUT Source (HIOP version)" and "Sink (HIOP version)".

Can the LM3311SQ-HIOP operate without using the Gate Pulse Modulation (GPM) function?

Yes, the LM3311SQ-HIOP can operate without GPM enabled. Per the datasheet, VDD should be connected to VIN and VDPM pulled low to disable the GPM block. All other functions - boost converter, LDO, and op-amp - remain fully operational. This configuration is validated in the Absolute Maximum Ratings and Operating Conditions tables, which specify independent operating ranges for each subsystem.

What thermal performance can be expected from the LM3311SQ-HIOP in a typical 2-layer PCB layout?

In a standard 2-layer PCB layout with proper DAP grounding, the LM3311SQ-HIOP achieves θ_JA = 37°C/W, as documented in the "Connection Diagram" figure caption. This allows continuous operation at full load (e.g., 2A boost + 300mA LDO + HIOP op-amp) up to 85°C ambient when using recommended copper pour and thermal vias - verified in the Typical Performance Characteristics section (Figures 13–16, 20–23).

Is the LM3311SQ-HIOP pin-compatible with the standard LM3311SQ?

Yes, the LM3311SQ-HIOP is pin-compatible with the standard LM3311SQ. Both share identical 24-pin WQFN (RTW0024A) packaging, pinout, and footprint, as confirmed in the "Connection Diagram" and "Pin Descriptions" sections of the SNVS320G datasheet. The HIOP variant is a drop-in replacement that upgrades op-amp performance without requiring PCB changes.

LM3311SQ-HIOP 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 FAQ

1.How can I place an order for LM3311SQ-HIOP through Aetrix?

Please submit a Request for Quotation (RFQ) for LM3311SQ-HIOP 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 reliable?

The price and inventory of LM3311SQ-HIOP 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 is usually 5 days.

3.What payment methods are accepted for LM3311SQ-HIOP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3311SQ-HIOP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM3311SQ-HIOP?

LM3311SQ-HIOP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM3311SQ-HIOP 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?

For technical support, including LM3311SQ-HIOP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3311SQ-HIOP requirements.

6.How does Aetrix verify that LM3311SQ-HIOP is sourced from the original manufacturer or authorized distributors?

All LM3311SQ-HIOP 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 meets industry standards.

7.What is the process for return or replacement of LM3311SQ-HIOP?

All LM3311SQ-HIOP units undergo pre-shipment inspection (PSI). If there is an issue with LM3311SQ-HIOP, 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 part is unused and in its original packaging.

Return procedure for LM3311SQ-HIOP:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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