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Texas Instruments LM3224MMX-ADJ/NOPB
- Part No.:
- LM3224MMX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM3224MMX-ADJ/NOPB.pdf
- Description:
- IC REG BOOST ADJ 1.9A 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,958
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Product details
Overview
LM3224MMX-ADJ/NOPB from Texas Instruments is a current-mode PWM step-up DC/DC converter with an integrated 0.15Ω (typ.) NMOS switch, pin-selectable 615kHz/1.25MHz switching frequency, and adjustable output voltage via external feedback resistors. It operates from 2.7V to 7V input and delivers up to 23V output - optimized for TFT LCD bias supplies and high-current white LED flash in portable devices.
For engineers reviewing the LM3224MMX-ADJ/NOPB datasheet, LM3224MMX-ADJ/NOPB pinout, LM3224MMX-ADJ/NOPB application, or LM3224MMX-ADJ/NOPB equivalent, key selection criteria include its 2.45A typical switch current limit, thermal shutdown protection at 140°C, soft-start control via external capacitor, compensation network flexibility (VC pin), and VSSOP-8 package compatibility with space-constrained handheld designs.
Technical Context
The LM3224MMX-ADJ/NOPB implements peak current-mode control with internal ramp compensation to suppress subharmonic oscillation above 50% duty cycle. Its error amplifier (transconductance: 40–135 µmho) drives the VC pin to regulate peak inductor current, while the FB pin maintains 1.26V reference for output voltage setting.
Protection circuitry includes undervoltage lockout (UVP: 2.5V on/off thresholds), overvoltage protection (OVP) preventing no-load runaway, and thermal shutdown that disables the NMOS switch above 140°C - recovering at ~120°C. Shutdown current is 0.1µA (typ.), and FSLCT pin selects frequency by grounding (615kHz) or tying to VIN (1.25MHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 7V - supports single-cell Li-ion (3.0–4.2V), dual-cell alkaline (3.0–3.6V), and USB-powered systems without pre-regulation. |
| Switch Current Limit | 2.45A (typ.) - enables high-output-power boost (e.g., 3.3V→8V @ 500mA or 3.3V→23V @ 150mA) with margin for transient loads. |
| Feedback Reference Voltage | 1.26V ±0.0315V - sets precise output voltage via RFB1/RFB2 divider; line regulation <0.15%/V ensures stability across input range. |
| 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 in high-current paths; enables >85% efficiency at moderate loads. |
| Thermal Shutdown Threshold | 140°C (activate), 120°C (release) - provides self-protecting operation under sustained overload or poor PCB thermal design. |
| Soft-Start Control | External CSS capacitor - limits inrush current during startup; soft-start time ≈ Css × 1.24V / 11µA (typ. ISS). |
Pinout & Package
LM3224MMX-ADJ/NOPB is housed in an 8-lead VSSOP package (Package Number DGK0008A), 3.0mm × 3.0mm footprint, 0.65mm pitch, 1.0mm max height - suitable for compact portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VC | Compensation network node | Connects external RC/CC network to stabilize voltage loop; sets dominant pole and zero for transient response tuning. |
| 2 - FB | Output voltage feedback input | Senses resistor-divider output; regulates VOUT to 1.26V reference - enables adjustable output from ~2.5V to 20V. |
| 3 - SHDN | Active-low enable control | Pulled low = device off (0.1µA IQ); pulled high ≥1.2V = enabled; internal pulldown ensures default OFF state. |
| 4 - GND | Analog + power ground | Common return for feedback, compensation, and switch current path - requires low-impedance PCB ground plane. |
| 5 - SW | Switch node | Connects internal NMOS drain to external inductor and Schottky diode - carries high di/dt; needs short, low-inductance routing. |
| 6 - VIN | Power input supply | Supplies bias and switch driver; accepts 2.7–7V; decoupling capacitor required close to pin for ripple suppression. |
| 7 - FSLCT | Frequency select input | Ground = 615kHz; connect to VIN = 1.25MHz - determines inductor size, EMI profile, and light-load efficiency. |
| 8 - SS | Soft-start timing input | Sinks 11µA (typ.) current to charge external CSS; controls output voltage ramp rate and inrush current magnitude. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable switching frequency | 615kHz or 1.25MHz - enables optimization of inductor size (4.7µH vs. 10µH) and EMI filter requirements per application. |
| Adjustable output voltage | Set via external RFB1/RFB2 divider - supports outputs from 2.5V to 20V using standard 1% resistors; no fixed-voltage variants required. |
| Integrated 0.15Ω NMOS switch | Eliminates external MOSFET and gate driver - reduces BOM count, layout area, and parasitic losses in portable power stages. |
| Thermal shutdown with hysteresis | Shuts down at 140°C, restarts at ~120°C - protects against sustained overloads without requiring external thermal monitoring. |
| External soft-start control | Programmable ramp via CSS capacitor - prevents inductor saturation and input rail droop during cold start or battery recovery. |
Applications
| TFT LCD Bias Supply | White LED Flash Driver |
|---|---|
|
Use Scenario: Generating +8V and −8V rails from a 3.3V supply to drive source/gate drivers in active-matrix TFT displays. IC Role / Device Role / Timing Role: Primary DC/DC boost converter providing stable, low-noise positive bias; paired with inverting charge pump for negative rail. Use Value: Enables compact, single-chip bias solution with <1.5% output voltage drift over temperature and load - critical for display grayscale accuracy. |
Use Scenario: Driving 2–4 parallel white LEDs at 1A total current for smartphone camera flash/torch mode from a 3.7V Li-ion battery. IC Role / Device Role / Timing Role: High-current step-up regulator delivering regulated 5.5V–6.5V to LED string; synchronized with camera shutter timing. Use Value: Delivers 92% peak efficiency at 1A load and supports rapid on/off cycling (<10ms ramp) - extends battery life and enables burst flash capability. |
| Portable Medical Instrument Power | GSM/CDMA RF Front-End Bias |
|
Use Scenario: Powering analog front-end (AFE) circuits and precision ADC references in handheld glucose meters or pulse oximeters. IC Role / Device Role / Timing Role: Low-noise, tightly regulated 5V supply derived from coin-cell or rechargeable battery - isolated from digital noise sources. Use Value: Achieves <10mVpp output ripple with ceramic output capacitors and supports 12-bit ADC accuracy without additional LDO post-regulation. |
Use Scenario: Supplying 5V/200mA bias to power amplifier (PA) modules and RF switches in 2G/3G cellular handsets. IC Role / Device Role / Timing Role: Efficient boost converter operating in discontinuous conduction mode during low-SNR receive periods; rapidly ramps during transmit bursts. Use Value: Maintains >80% efficiency at 50mA load and supports dynamic frequency scaling (615kHz → 1.25MHz) to reduce quiescent current during idle states. |
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 limit, fixed 500kHz/1.1MHz frequency, no external soft-start pin - uses internal soft-start. | Better suited for >2A output applications (e.g., USB PD sink), but lacks adjustable soft-start timing and VC compensation flexibility. | Select TPS61088RHLR when higher output current and integrated loop compensation are prioritized over fine-grained transient tuning. |
| MAX17062ETA+ | Fixed 5V output (non-adjustable), 2.5A switch, 1.2MHz only, no FSLCT pin - smaller 8-pin µMAX package. | Targeted at cost-sensitive, fixed-output applications like memory card readers or simple sensor nodes - no feedback resistor network needed. | Choose MAX17062ETA+ only for fixed 5V systems where board space is critical and output adjustability is unnecessary. |
Compared with TPS61088RHLR and MAX17062ETA+, the LM3224MMX-ADJ/NOPB offers unique VC pin-based loop compensation and pin-selectable frequency - enabling superior transient response tailoring and EMI profile control in variable-output, space-constrained portable designs.
Availability
LM3224MMX-ADJ/NOPB is available at Aetrix Electronics and suitable for TFT bias supplies, white LED flash drivers, portable medical instrumentation, and GSM/CDMA RF front-end power requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for LM3224MMX-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 LM3224MMX-ADJ/NOPB belongs to TI's portable power management product line, designed specifically for space- and efficiency-critical boost applications in handheld consumer electronics and imaging systems.
FAQ
What output voltage range can be set using the LM3224MMX-ADJ/NOPB?
The LM3224MMX-ADJ/NOPB supports adjustable output voltages from approximately 2.5V to 20V, determined by the external feedback resistor divider (RFB1/RFB2) and the 1.26V internal reference. The maximum output is limited by absolute maximum ratings (SW pin ≤21V) and practical considerations such as inductor saturation and diode reverse voltage rating. For example, a 3.3V input can reliably generate 8V, −8V (with inverting topology), or 23V outputs depending on component selection and layout.
How does the FSLCT pin affect the LM3224MMX-ADJ/NOPB's performance?
The FSLCT pin on the LM3224MMX-ADJ/NOPB selects between two fixed switching frequencies: grounding the pin sets 615kHz operation, while connecting it to VIN selects 1.25MHz. This choice directly impacts inductor size (smaller at 1.25MHz), EMI spectral distribution, light-load efficiency, and output capacitor ESR requirements. At 1.25MHz, the device achieves faster transient response but may exhibit slightly lower efficiency under heavy continuous load due to increased switching losses.
Can the LM3224MMX-ADJ/NOPB be used in inverting (buck-boost) configurations?
Yes - the LM3224MMX-ADJ/NOPB can be configured as an inverting regulator to generate negative output voltages (e.g., −8V from 3.3V). This requires reconfiguring the inductor and diode placement per TI's Application Report SLVA311, with the SW pin driving the cathode of the Schottky diode and the output taken from the junction of the diode anode and capacitor ground. The feedback network remains connected to the negative output rail, referenced to system ground.
What is the purpose of the VC pin on the LM3224MMX-ADJ/NOPB, and how is it used?
The VC pin on the LM3224MMX-ADJ/NOPB is the compensation node for the voltage control loop - it connects to the output of the internal error amplifier. A series RC/CC network between VC and GND sets dominant pole-zero pairs to stabilize the feedback loop, especially critical for current-mode boost converters with right-half-plane zeros. Proper VC network design ensures phase margin >45°, suppresses ringing during load transients, and enables use of low-ESR ceramic output capacitors without instability.
Does the LM3224MMX-ADJ/NOPB include overvoltage protection, and how does it function?
Yes - the LM3224MMX-ADJ/NOPB includes dedicated overvoltage protection (OVP) circuitry that monitors the FB pin voltage. If the feedback voltage exceeds the OVP threshold (typically ~1.4V, corresponding to ~22V output assuming 1.26V reference), the controller disables the NMOS switch to prevent uncontrolled output rise during no-load or open-feedback conditions. This feature ensures safe operation even if the feedback resistor network fails open or is misconfigured.
LM3224MMX-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
LM3224MMX-ADJ/NOPB FAQ
1.How can I place an order for LM3224MMX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3224MMX-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 LM3224MMX-ADJ/NOPB reliable?
The price and inventory of LM3224MMX-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 LM3224MMX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM3224MMX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3224MMX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3224MMX-ADJ/NOPB?
LM3224MMX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3224MMX-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 LM3224MMX-ADJ/NOPB?
For technical support, including LM3224MMX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3224MMX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM3224MMX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3224MMX-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 LM3224MMX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM3224MMX-ADJ/NOPB?
All LM3224MMX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3224MMX-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 LM3224MMX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM3224MMX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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