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Texas Instruments LM3211MTX-ADJ/NOPB
- Part No.:
- LM3211MTX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3211MTX-ADJ/NOPB.pdf
- Description:
- IC REG BOOST ADJ 1.4A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,208
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Product details
Overview
LM3211MTX-ADJ/NOPB from Texas Instruments is a current-mode PWM step-up DC/DC converter with integrated 4-channel gamma buffer amplifier array, designed for TFT-LCD bias generation. It features a 1.4A/0.17Ω internal power switch, 2.2V–7.5V input range, selectable 600kHz/1.25MHz switching frequency, and adjustable output voltage via external resistor divider (FB pin = 1.265V). It delivers up to 8V at 300mA from Li-ion battery input.
For engineers reviewing the LM3211MTX-ADJ/NOPB datasheet, LM3211MTX-ADJ/NOPB pinout, LM3211MTX-ADJ/NOPB application, or LM3211MTX-ADJ/NOPB equivalent, key selection considerations include inrush-limited soft-start behavior, dual internal/external soft-start control, gamma buffer sourcing/sinking capability (±39mA typical), VC compensation network design, and TSSOP-20 thermal performance (θJA = 120°C/W).
Technical Context
The LM3211MTX-ADJ/NOPB implements current-mode PWM control with dual-loop feedback: inner loop senses switch current via slope compensation, outer loop regulates output voltage via error amplifier (gm = 60–250 µmho) and 1.265V reference. Its patented internal inrush limiting eliminates need for external soft-start capacitor, while SS pin enables programmable ramp time (Tss ≈ Css × 0.6V / 11µA).
Four rail-to-rail gamma buffers operate from Vs+ (4V–12V), each delivering ±39mA (source) / −37mA (sink) at Vs+ = 8V with 3MHz bandwidth and 78° phase margin. The VC pin supports RC/CC network compensation to stabilize the boost loop against right-half-plane zero (RHPZ) effects, with recommended RC = 5kΩ–60kΩ and CC = 680pF–4.7nF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.2V to 7.5V - supports single-cell Li-ion (2.7–4.2V) and 3.3V/5V rails without pre-regulation |
| Output Voltage Range | Adjustable via FB resistor divider - set point determined by VFB = 1.265V, enabling outputs from ~2.5V to >10V |
| Switch Current Limit | 1.4A - defines maximum inductor peak current and short-circuit robustness under load transients |
| Internal Switch RDS(ON) | 170 mΩ at VIN = 2.7V - determines conduction loss and thermal rise at full load (e.g., ~360mW at 1.4A) |
| Gamma Buffer Output Current | ±39mA source / −37mA sink at Vs+ = 8V - sufficient to drive 27Ω gamma string loads with <1% linearity error |
| Switching Frequency | Selectable 600kHz or 1.25MHz - higher frequency enables smaller L/C (e.g., 4.7µH/10µF), lower frequency improves efficiency at light loads |
| Soft-Start Current | 11 µA (typical) - sets external CSS ramp rate; internal soft-start provides minimum 6.7ms (600kHz) or ~3.5ms (1.25MHz) baseline |
Pinout & Package
LM3211MTX-ADJ/NOPB is housed in a thermally enhanced 20-pin TSSOP package (Package Code PW, θJA = 120°C/W), with exposed pad for improved heat dissipation. Pin 1 (VSW) is the drain of the internal NMOS switch; Pins 19 (AGND) and 20 (GND) must be tied together at the package for optimal noise isolation between analog and power grounds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VSW | Power switch drain | High-dv/dt node - requires minimal trace area and tight layout to reduce EMI coupling into analog sections |
| 2 VIN | Boost regulator input supply | Bypassed directly to GND with low-ESR ceramic capacitor (≥10µF) to suppress input ripple and supply noise |
| 3 SHDN | Active-low shutdown control | Logic threshold: <0.3V disables, >0.85V enables - compatible with standard CMOS/LVTTL GPIOs |
| 4 FSLCT | Frequency select | Connect to AGND/floating → 600kHz; connect to VIN → 1.25MHz - sets switching period and filter component sizing |
| 5 Vs+ | Gamma buffer supply | Independent 4V–12V rail - bypassed separately to GND to prevent gamma output crosstalk and supply modulation |
| 6–9 GMA1-in to GMA4-in | Gamma buffer inputs | Rail-to-rail capable - accepts 0.05V to (Vs+−0.05V); high ZIN (400kΩ) minimizes loading on DAC or resistor ladder sources |
| 12–15 GMA4-out to GMA1-out | Gamma buffer outputs | Deliver ±39mA with 7.85V swing into 2kΩ - support direct connection to LCD gamma strings without external drivers |
| 16 SS | External soft-start control | Sinks 11µA to charge external CSS - enables precise startup current ramping for large capacitive loads (e.g., panel VCOM) |
| 17 VC | Boost compensation network | Connects RC/CC series network to AGND - sets dominant pole/zero to counteract RHP zero and ensure ≥45° phase margin |
| 18 FB | Output voltage feedback | 1.265V reference input - sets VOUT = 1.265V × (1 + R1/R2); IB = 30–90nA requires high-R divider (e.g., 160kΩ/30kΩ) |
| 19 AGND | Analog ground | Reference for gamma buffers and FB/VC circuits - must tie directly to GND at package to avoid ground bounce errors |
| 20 GND | Power ground | Return path for switch current - low-inductance connection essential to minimize voltage spikes across RDS(ON) |
Key Features
| Feature | Design Value |
|---|---|
| Inrush current limiting circuitry | Patented internal startup control eliminates need for external soft-start capacitor - reduces BOM count and board space in portable LCD designs |
| External softstart override | SS pin sinks 11µA to charge external capacitor - enables user-defined ramp time longer than internal minimum (6.7ms @ 600kHz) |
| 4 gamma buffers with rail-to-rail I/O | Each buffer delivers ±39mA at Vs+ = 8V with 3MHz BW and 0.01% gain linearity - supports 18-bit grayscale accuracy in large-panel TFT displays |
| Selectable 600kHz/1.25MHz switching | Frequency selection via FSLCT pin - allows trade-off between EMI filtering complexity (lower fS) and passive size (higher fS) |
| Current-mode PWM architecture | Provides inherent cycle-by-cycle overcurrent protection and fast transient response - stabilizes against input/output variations without external compensation |
| Integrated 1.4A/0.17Ω power switch | Reduces external component count and PCB footprint - eliminates discrete MOSFET, gate driver, and current-sense resistor |
Applications
| Large-Screen TFT-LCD Bias Supply | Handheld Device Power Management |
|---|---|
Use Scenario: Generating VGH (15–20V), VGL (−10V), and AVDD (5–8V) for 7–10 inch LCD panels in tablets or industrial HMIs. IC Role / Device Role / Timing Role: Primary step-up DC/DC converter with integrated gamma buffering - replaces discrete boost IC + op-amp array, reducing solution size by >40%. Use Value: Single-chip solution eliminates inter-stage routing noise, improves gamma voltage tracking accuracy (<0.5% drift), and enables synchronized soft-start across all bias rails. |
Use Scenario: Providing regulated 8V bias for LCD backlight drivers and gamma correction in battery-powered digital cameras. IC Role / Device Role / Timing Role: Dual-function power IC - boost converter supplies panel bias while gamma buffers condition DAC outputs for grayscale control. Use Value: 2.2V minimum VIN enables operation down to 2.5V battery voltage; shutdown current <15µA extends standby time in sleep mode. |
| Portable Medical Display System | Automotive Infotainment Panel |
Use Scenario: Driving high-resolution monochrome or color LCDs in portable ultrasound or patient monitors with strict EMI limits. IC Role / Device Role / Timing Role: EMI-optimized DC/DC + analog signal conditioner - 1.25MHz option minimizes conducted emissions; gamma buffers reject supply noise via high PSRR (90–316 µV/V). Use Value: Internal inrush limiting prevents input voltage sag during startup; rail-to-rail buffers maintain contrast ratio stability across temperature (ΔVos/ΔT = 8 µV/°C). |
Use Scenario: Supplying bias voltages and gamma correction for 12.3-inch digital instrument clusters operating from 5V vehicle bus. IC Role / Device Role / Timing Role: High-reliability display power IC - operates from −40°C to +125°C ambient; TSSOP-20 package meets AEC-Q200 stress requirements when mounted with thermal pad. Use Value: 125°C max junction temperature and 120°C/W θJA enable continuous 300mA output in sealed enclosures; gamma buffers tolerate Vs+ up to 14V for transient ride-through. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC/DC converter with gamma buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3211MTX-3.3/NOPB | Fixed 3.3V output (non-adjustable); same pinout, gamma buffers, and switching architecture | Eliminates external FB resistors but lacks flexibility for custom VOUT; suitable only where 3.3V bias is required | Select when fixed output simplifies design and reduces component count - not usable for 5V/8V/10V LCD bias rails |
| TPS65105RGTR | Dual-output (positive/negative) with integrated charge pump; no gamma buffers; 1.5MHz fixed fS; different pinout and control interface | Targets dual-rail LCD bias (VPOS/VNEG) without gamma function; requires external op-amps for gamma correction | Choose for systems needing negative voltage generation alongside positive boost - adds design complexity but expands rail options |
Compared with LM3211MTX-ADJ/NOPB, the LM3211MTX-3.3/NOPB trades adjustability for simplicity in fixed-voltage use cases, while the TPS65105RGTR offers complementary negative-rail capability at the cost of gamma integration and pin compatibility - neither is drop-in replaceable, but both serve adjacent display power architectures.
Availability
LM3211MTX-ADJ/NOPB is available at Aetrix Electronics and suitable for large-screen TFT-LCD bias supplies, handheld device power management, and portable medical display systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM3211MTX-ADJ/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, embedded processing, and power management technologies, with decades of expertise in display power solutions and high-reliability IC design.
The LM3211 product line was developed specifically for compact, high-efficiency bias generation in TFT-LCD modules - integrating boost conversion and gamma buffering to reduce system-level component count and improve grayscale fidelity in portable and automotive displays.
FAQ
What is the minimum input voltage required for stable operation of the LM3211MTX-ADJ/NOPB?
The LM3211MTX-ADJ/NOPB operates reliably down to 2.2V input voltage across its full temperature range (−40°C to +125°C). At 2.2V, it maintains regulation for outputs up to 8V at reduced load current due to duty cycle limitations; for 300mA at 8V, VIN ≥2.5V is recommended per the Electrical Characteristics table. Below 2.2V, undervoltage lockout activates and the device enters shutdown.
How does the LM3211MTX-ADJ/NOPB implement soft-start, and can it be disabled?
The LM3211MTX-ADJ/NOPB uses patented internal circuitry to limit inrush current during startup, providing a baseline soft-start time of 6.7ms (600kHz) or ~3.5ms (1.25MHz). This cannot be disabled. An external soft-start capacitor on the SS pin extends the ramp time beyond this minimum - connecting SS to AGND has no effect, and leaving SS open defaults to internal timing. No configuration disables soft-start entirely.
What gamma buffer output current capability does the LM3211MTX-ADJ/NOPB provide at Vs+ = 12V?
At Vs+ = 12V, the LM3211MTX-ADJ/NOPB gamma buffers deliver +35 to +59mA source current and −54 to −32mA sink current, depending on load and temperature. These values are specified in the Electrical Characteristics table under "IOUT Continuous Output Current" - higher Vs+ increases headroom and output swing (up to Vs+ − 0.075V), enabling driving of heavier gamma strings or wider voltage ranges.
Can the LM3211MTX-ADJ/NOPB be used with ceramic output capacitors, and what ESR considerations apply?
Yes, the LM3211MTX-ADJ/NOPB is optimized for low-ESR ceramic output capacitors (e.g., X5R/X7R 10–22µF). Its VC compensation network allows stable operation with ESR as low as 5mΩ. For higher-ESR tantalum or electrolytic caps, the ESR zero must be compensated using CC2 (per datasheet Section 9.2.2), otherwise phase margin degrades. Ceramic caps simplify design and improve transient response without additional compensation.
What is the maximum allowable output voltage that can be set using the FB pin on the LM3211MTX-ADJ/NOPB?
The LM3211MTX-ADJ/NOPB FB pin has an absolute maximum rating of 7V, and the feedback network ground must connect to AGND. Using the formula VOUT = 1.265V × (1 + R1/R2), practical maximum VOUT is limited by resistor voltage ratings and layout leakage. With standard 0603 resistors rated for 50V, outputs up to 15V are achievable - however, the VSW pin rating is 18V, so VOUT must remain ≤17V to maintain safe margin against breakdown under transient conditions.
LM3211MTX-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- 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):
- 2.2V
- Voltage - Input (Max):
- 7.5V
- Voltage - Output (Min/Fixed):
- 8V
- Voltage - Output (Max):
- 17V
- Current - Output:
- 1.4A (Switch)
- Frequency - Switching:
- 600kHz, 1.25MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
LM3211MTX-ADJ/NOPB FAQ
1.How can I place an order for LM3211MTX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3211MTX-ADJ/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 LM3211MTX-ADJ/NOPB reliable?
The price and inventory of LM3211MTX-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3211MTX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM3211MTX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3211MTX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3211MTX-ADJ/NOPB?
LM3211MTX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3211MTX-ADJ/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 LM3211MTX-ADJ/NOPB?
For technical support, including LM3211MTX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3211MTX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM3211MTX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3211MTX-ADJ/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 LM3211MTX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM3211MTX-ADJ/NOPB?
All LM3211MTX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3211MTX-ADJ/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 LM3211MTX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM3211MTX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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