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Texas Instruments LM3224MM-ADJ/NOPB
- Part No.:
- LM3224MM-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM3224MM-ADJ/NOPB.pdf
- Description:
- IC REG BOOST ADJ 1.9A 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,800
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Product details
Overview
LM3224MM-ADJ/NOPB from Texas Instruments is a current-mode, pin-selectable-frequency step-up DC/DC converter with an integrated 0.15Ω (typ.) 2.45A NMOS switch, 1.26V feedback reference, and external compensation for stable operation across wide load and input ranges. It delivers up to 23V output from 2.7V–7V input and supports TFT LCD biasing and white LED flash in portable devices.
For engineers reviewing the LM3224MM-ADJ/NOPB datasheet, LM3224MM-ADJ/NOPB pinout, LM3224MM-ADJ/NOPB application, or LM3224MM-ADJ/NOPB equivalent, key selection criteria include adjustable output via resistor divider, dual switching frequencies (615kHz/1.25MHz), thermal shutdown, soft-start control, and VSSOP-8 package compatibility with space-constrained handheld designs.
Technical Context
The LM3224MM-ADJ/NOPB employs peak-current-mode PWM control with ramp compensation to suppress subharmonic oscillation above 50% duty cycle. Its VC pin provides direct access to the error amplifier output for custom loop compensation using RC/CC networks.
It integrates over-temperature protection (shut down at ~140°C, restart at ~120°C), undervoltage lockout (UVP active below 2.5V), overvoltage protection (OVP prevents no-load runaway), and shutdown logic with internal pulldown - enabling <0.1µA quiescent current in disable mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 7V - supports single-cell Li-ion (3.0–4.2V), 3.3V rails, and dual-cell NiMH (2.4–3.0V) without pre-regulation. |
| Output Voltage Range | Adjustable from 8V to 23V - set by external RFB1/RFB2 divider; 1.26V FB reference enables precise scaling. |
| Switch Current Limit | 2.45A (typ.) - sustains high peak loads for white LED flash pulses without foldback or hiccup. |
| Switching Frequency | 615kHz or 1.25MHz (pin-selectable) - allows trade-off between inductor size (4.7–15µH) and EMI filtering complexity. |
| Internal Switch RDS(on) | 0.15Ω (typ.) at VIN = 2.7V - minimizes conduction loss and thermal rise under 1A+ output currents. |
| Feedback Reference Voltage | 1.26V ±0.0315V - tight tolerance ensures ≤±2.5% output regulation accuracy across temperature and line. |
| Quiescent Current | 2.0mA (switching), 0.1µA (shutdown) - enables battery longevity in always-on standby and low-duty-cycle flash modes. |
Pinout & Package
LM3224MM-ADJ/NOPB is housed in an 8-lead VSSOP (Package DGK0008A), 3.0mm × 3.0mm × 1.0mm body, 0.65mm pitch, thermally enhanced with exposed pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VC | Compensation network node | Connects to error amplifier output; RC/CC network here sets dominant pole and zero for loop stability. |
| 2 - FB | Feedback voltage input | Senses divided output voltage; 1.26V reference enables programmable output via RFB1/RFB2 ratio. |
| 3 - SHDN | Active-low enable control | Pulled low by internal pulldown; requires >1.2V to enable - compatible with 1.8V/3.3V GPIOs. |
| 4 - GND | Analog + power ground | Single-point return for feedback, compensation, and switch current path - critical for noise immunity. |
| 5 - SW | Switch node | Drives external inductor; connects internally to NMOS drain - requires low-inductance layout to minimize ringing. |
| 6 - VIN | Power input supply | Supplies bias and switch driver; must be decoupled with ≥10µF ceramic capacitor near pin. |
| 7 - FSLCT | Frequency select input | Ground = 615kHz; connect to VIN = 1.25MHz - selects optimal frequency before startup, not dynamic. |
| 8 - SS | Soft-start timing node | Charged by internal 11µA current source; CSS sets inrush current ramp time per Tss = CSS×1.24V/11µA. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable switching frequency | 615kHz or 1.25MHz - enables optimization of inductor size (15µH vs. 4.7µH) and EMI filter footprint. |
| External soft-start control | Programmable inrush current limit via capacitor on SS pin - prevents input rail collapse during cold start. |
| Thermal shutdown with hysteresis | Shuts off at ~140°C, resumes at ~120°C - protects against sustained overload or poor PCB heatsinking. |
| Integrated 2.45A NMOS switch | 0.15Ω RDS(on) (typ.) - eliminates external MOSFET, reduces BOM count, and improves efficiency at 1A loads. |
| Current-mode PWM architecture | Ramp-compensated control - inherently stable at >50% duty cycles and responsive to load transients. |
Applications
| TFT LCD Bias Supply | White LED Flash Driver |
|---|---|
|
Use Scenario: Generating +8V and −8V rails for gate drivers and source drivers in small-format TFT panels used in digital cameras and portable medical displays. IC Role / Device Role / Timing Role: Step-up converter providing regulated positive bias; paired with inverting charge pump or second LM3224 for negative rail. Use Value: Achieves >85% efficiency at 100mA load with 4.7µH inductor and ceramic output caps - enabling compact, low-noise bias generation. |
Use Scenario: Driving 3–5 parallel white LEDs at 1A peak current for smartphone torch/flash functionality with minimal board area. IC Role / Device Role / Timing Role: High-current boost controller delivering 23V at 1A with fast transient response to strobe trigger signals. Use Value: 2.45A switch current limit and 0.15Ω RDS(on) support 1A LED pulses without thermal throttling or voltage droop. |
| GSM/CDMA Handset Power Management | Digital Camera Backlight Control |
|
Use Scenario: Supplying 12V–15V to RF power amplifiers and analog front-end ICs in legacy 2G/3G mobile handsets operating from 3.3V–4.2V batteries. IC Role / Device Role / Timing Role: Primary boost stage in multi-rail PMIC subsystem - sequenced via SHDN and synchronized via FSLCT pin. Use Value: 615kHz operation allows use of small 10µH inductors while maintaining >80% efficiency across 50–500mA load range. |
Use Scenario: Providing adjustable 10V–18V backlight voltage for high-resolution camera viewfinders and rear LCDs with brightness dimming via FB divider. IC Role / Device Role / Timing Role: Programmable boost regulator with analog dimming interface - FB pin voltage modulated to scale output linearly. Use Value: 1.26V ±0.0315V FB reference enables <±3% output accuracy over −40°C to +85°C - critical for consistent display luminance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61088RHLR | Higher 12A switch current, 2.7V–12V input, fixed 500kHz/2MHz frequency - no external compensation or soft-start pin. | Better suited for high-power USB PD sink applications; lacks adjustable soft-start and VC-based loop tuning. | Select when >3A output and integrated OVP/SCP are required; avoid if custom compensation or precise inrush control is needed. |
| MAX17062ETA+ | Fixed 1.2MHz frequency, 2.5V–5.5V input, 1.5A switch, integrated Schottky - no FSLCT or SS pins. | Targeted at ultra-compact consumer electronics; missing frequency flexibility and external soft-start adjustability. | Choose for space-constrained designs where 1.5A max load and fixed frequency suffice; not suitable for 23V outputs or thermal-critical flash use. |
Compared with TPS61088RHLR and MAX17062ETA+, the LM3224MM-ADJ/NOPB uniquely combines pin-selectable frequency, external soft-start timing, and full VC-loop compensation - making it preferred for TFT bias and LED flash designs requiring design flexibility and thermal robustness.
Availability
LM3224MM-ADJ/NOPB is available at Aetrix Electronics and suitable for TFT LCD bias supplies, white LED flash drivers, GSM/CDMA handset power management, and digital camera backlight control requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LM3224MM-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 ICs, with decades of expertise in high-efficiency DC/DC conversion and portable power solutions.
The LM3224MM-ADJ/NOPB belongs to TI's precision boost converter product line, engineered specifically for space-constrained, battery-powered applications demanding high output voltage, low quiescent current, and robust thermal protection - including handheld displays and imaging systems.
FAQ
What is the maximum output voltage achievable with the LM3224MM-ADJ/NOPB?
The LM3224MM-ADJ/NOPB supports a maximum output voltage of 23V, as specified in its absolute maximum ratings and confirmed in typical application circuits. This capability is enabled by its 21V-rated SW pin and internal protection circuitry that prevents overvoltage conditions during no-load operation. The actual output is set externally via the FB resistor divider, and the 23V limit ensures safe operation with standard 25V-output capacitors and Schottky diodes.
How does the FSLCT pin determine switching frequency in the LM3224MM-ADJ/NOPB?
The FSLCT pin on the LM3224MM-ADJ/NOPB selects between two fixed frequencies: grounding the pin configures 615kHz operation, while connecting it to VIN selects 1.25MHz. This selection occurs at power-up and is not dynamically reconfigurable. The choice directly impacts inductor sizing - 1.25MHz allows smaller 4.7µH units, whereas 615kHz suits larger 10–15µH inductors - and influences EMI filter design and light-load efficiency trade-offs.
Can the LM3224MM-ADJ/NOPB be used in discontinuous conduction mode (DCM)?
Yes, the LM3224MM-ADJ/NOPB operates reliably in both continuous and discontinuous conduction modes. Its current-mode control architecture and ramp compensation ensure stability even at light loads where inductor current falls to zero. Designers can intentionally operate in DCM by selecting higher inductance or lower output current - which reduces switching losses and improves light-load efficiency, though peak switch current remains bounded by the 2.45A current limit.
What is the purpose of the VC pin on the LM3224MM-ADJ/NOPB, and how is it used?
The VC pin on the LM3224MM-ADJ/NOPB is the output of the internal error amplifier and serves as the compensation node for the voltage feedback loop. It is connected to an external RC/CC network to place a dominant pole and zero, stabilizing the control loop against right-half-plane zero effects. Proper VC network design - typically 5kΩ–100kΩ RC and 680pF–10nF CC - ensures adequate phase margin (>45°) and optimal transient response for the target load and output capacitor ESR.
Does the LM3224MM-ADJ/NOPB require an external Schottky diode, and what are the key selection criteria?
Yes, the LM3224MM-ADJ/NOPB requires an external Schottky diode connected between SW and VOUT. Key selection criteria include: reverse voltage rating ≥23V (to handle max output), average current rating >max load current, and peak current rating >2.45A (to survive switch current limit events). Low forward voltage (≤0.4V) and low junction capacitance are critical for efficiency and EMI performance - e.g., Diodes Inc. AP1509SG-13 or ON Semiconductor SB560.
LM3224MM-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 7V
- Voltage - Output (Min/Fixed):
- 1.26V
- Voltage - Output (Max):
- 20V
- Current - Output:
- 1.9A (Switch)
- Frequency - Switching:
- 615kHz, 1.25MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LM3224MM-ADJ/NOPB FAQ
1.How can I place an order for LM3224MM-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3224MM-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 LM3224MM-ADJ/NOPB reliable?
The price and inventory of LM3224MM-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 LM3224MM-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM3224MM-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3224MM-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3224MM-ADJ/NOPB?
LM3224MM-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3224MM-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 LM3224MM-ADJ/NOPB?
For technical support, including LM3224MM-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3224MM-ADJ/NOPB requirements.
6.How does Aetrix verify that LM3224MM-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3224MM-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 LM3224MM-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM3224MM-ADJ/NOPB?
All LM3224MM-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3224MM-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 LM3224MM-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM3224MM-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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