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Texas Instruments LM2653MTCX-ADJ/NOPB
- Part No.:
- LM2653MTCX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2653MTCX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,801
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Product details
Overview
LM2653MTCX-ADJ/NOPB from Texas Instruments is a 1.5A synchronous step-down DC-DC switching regulator in a 16-pin TSSOP package, operating from 4V to 14V input and delivering adjustable 1.5V–5.0V output with up to 97% efficiency. It integrates high- and low-side MOSFETs, uses patented current-mode control without external sense resistors, and supports battery-powered PDA, notebook video supply, and handheld scanner applications.
For engineers reviewing the LM2653MTCX-ADJ/NOPB datasheet, LM2653MTCX-ADJ/NOPB pinout, LM2653MTCX-ADJ/NOPB application, or LM2653MTCX-ADJ/NOPB equivalent, key selection criteria include its 300 kHz fixed-frequency PWM/hysteretic hybrid operation, 7 µA shutdown current, 0.1 Ω switch RDS(ON), adjustable soft-start via SS pin, and integrated PGOOD with programmable delay.
Technical Context
The LM2653MTCX-ADJ/NOPB employs constant-frequency (300 kHz) current-mode PWM for loads >100 mA and automatically transitions to hysteretic "sleep" mode below that threshold to maintain >80% efficiency at 15 mA. Its patented internal current sensing eliminates external sense resistors, while feedforward compensation stabilizes current limit across input voltage variations.
Protection architecture includes cycle-by-cycle current limiting (2.0 A typical), thermal shutdown at 165°C with 25°C hysteresis, input UVLO (3.8 V rising edge), and output OVP/UVP latching with programmable delay via LDELAY pin. The PGOOD flag asserts low on output deviation beyond ±20% of nominal voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 14 V - supports wide-input battery and industrial rails without pre-regulation. |
| Output Voltage Range | 1.5 V to 5.0 V adjustable - set via external resistor divider (VFB = 1.238 V typical). |
| Max Output Current | 1.5 A continuous - sufficient for core/I/O rails in portable computing and peripherals. |
| Switch RDS(ON) | 75 mΩ (typ) - minimizes conduction loss and enables high efficiency at full load. |
| Shutdown Current | 7 µA - enables ultra-low-power standby in battery-critical systems. |
| Oscillator Frequency | 300 kHz fixed - allows use of compact, low-profile inductors and capacitors. |
| Feedback Voltage | 1.238 V (typ), ±2.5% over temp - defines output accuracy and sets resistor-divider ratio. |
| PGOOD Thresholds | 80% undervoltage / 108% overvoltage - provides reliable power-good monitoring with hysteresis. |
Pinout & Package
LM2653MTCX-ADJ/NOPB is housed in a 16-pin TSSOP (PW0016A) package with exposed thermal pad (not electrically connected), JEDEC-standard footprint, and RoHS-compliant green finish (CU SN). Thermal resistance θJA = 140°C/W (no heatsink); max power dissipation = 893 mW at 25°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–2, SW | Switched-node connection | Drain of internal high-side MOSFET and source of low-side MOSFET; connects to inductor and Schottky diode anode. |
| 3–5, VIN | Main power input | Supplies high-side MOSFET drain and internal bias circuitry; requires local low-ESR input capacitor. |
| 6, VCB | Bootstrap capacitor node | Charges bootstrap capacitor (0.1 µF ceramic) to drive high-side gate above VIN. |
| 7, AVIN | Analog supply input | Powers error amplifier, comparator, and logic; decoupled separately from VIN for noise immunity. |
| 8, SD(SS) | Shutdown/Soft-start control | Pulling <0.3 V disables regulator; capacitor to ground controls ramp-up time and prevents inrush. |
| 9, FB | Feedback input | Senses output voltage via resistor divider; sets regulation point at 1.238 V reference. |
| 10, COMP | Compensation network | Connects external RC/C network to stabilize loop; Gm amplifier output with 80 kΩ output impedance. |
| 11, PGOOD | Power-good status flag | Open-drain output goes low during OVP/UVP latch events; requires pull-up resistor. |
| 12, LDELAY | UV latch delay timing | Capacitor to ground sets delay (TDELAY = CDELAY × 2 V / 5 µA) before UV protection activates. |
| 13, AGND | Analog ground | Reference for feedback, error amp, and comparators; must be star-connected to PGND at single point. |
| 14–16, PGND | Power ground | Return path for high-current switches and input/output capacitors; separate from AGND to reduce noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode conduction loss; achieves up to 97% peak efficiency. |
| Patented current sensing | Replaces external sense resistor with internal circuitry-reduces BOM count, PCB area, and noise susceptibility. |
| Hybrid PWM/hysteretic mode | Maintains >80% efficiency down to 15 mA load by switching to low-frequency burst mode at light loads. |
| Adjustable soft-start | Programmed via SS pin capacitor; prevents output overshoot and inrush current during startup. |
| Programmable PGOOD delay | LDELAY pin capacitor sets UV lockout timing-avoids false triggering during transient load steps. |
| Integrated protections | Includes thermal shutdown (165°C), input UVLO (3.8 V), output OVP/UVP latching, and cycle-by-cycle current limit (2.0 A). |
Applications
| Personal Digital Assistants (PDAs) | Notebook Computer Video Supply |
|---|---|
Use Scenario: Powering LCD backlight drivers and graphics I/O interfaces in space-constrained PDAs with single-cell Li-ion input. IC Role / Device Role / Timing Role: Primary synchronous buck converter regulating 3.3 V or 2.5 V from 4–5.5 V battery rail. Use Value: 97% efficiency extends runtime; 7 µA shutdown current preserves battery during sleep; TSSOP-16 enables compact layout. |
Use Scenario: Delivering stable 5 V or 3.3 V to GPU memory and display interface circuits in ultraportable notebooks. IC Role / Device Role / Timing Role: High-current (1.5 A) core voltage regulator with fast transient response and PGOOD sequencing. Use Value: Adjustable soft-start prevents GPU reset during boot; PGOOD delay avoids false UV faults during video load transients. |
| Battery-Powered Handheld Scanners | Computer Peripherals (USB Hubs, Docking Stations) |
Use Scenario: Providing regulated 3.3 V for CMOS image sensor, MCU, and wireless transceiver in intermittent-use scanners. IC Role / Device Role / Timing Role: Main system power supply with deep-sleep mode activation below 100 mA load. Use Value: Hysteretic light-load mode sustains >85% efficiency at 20 mA, extending scan session duration per charge. |
Use Scenario: Generating 5 V bus power from 12 V adapter input in USB 3.0 hubs and multi-port docking stations. IC Role / Device Role / Timing Role: Efficient intermediate-stage buck converter feeding downstream LDOs or USB power switches. Use Value: 4–14 V input range accommodates wide-input adapters; 300 kHz frequency simplifies EMI filtering with small magnetics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS5430DDAR | 3 A output, 500 kHz switching, no integrated low-side FET (external diode required), higher IQ (5 mA) | Higher current capability but lower light-load efficiency; lacks PGOOD delay and sleep-mode hysteresis | Choose when >1.5 A output or higher frequency is required; avoid if battery life at light load is critical |
| LM2678SD-ADJ/NOPB | 5 A output, 260 kHz, external diode, no sleep mode, higher shutdown current (50 µA), larger SOIC-8 package | Targeted at higher-power industrial supplies; lacks programmable UV delay and integrated PGOOD | Prefer for cost-sensitive 5 A designs where efficiency below 200 mA is not prioritized |
Compared with TPS5430DDAR and LM2678SD-ADJ/NOPB, LM2653MTCX-ADJ/NOPB delivers superior light-load efficiency via hysteretic sleep mode, integrated PGOOD with configurable delay, and patented current sensing-making it optimal for portable applications demanding long battery life and compact layout.
Availability
LM2653MTCX-ADJ/NOPB is available at Aetrix Electronics and suitable for battery-powered handheld scanners, notebook computer video supply rails, and personal digital assistant (PDA) power management requiring stable component supply across production lifecycles.
Supply support for LM2653MTCX-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 automotive-grade reliability.
The LM2653MTCX-ADJ/NOPB belongs to TI's legacy high-efficiency synchronous buck regulator family, designed specifically for portable and battery-operated systems needing wide-input-range, low-quiescent-current, and integrated protection features.
FAQ
What is the recommended input capacitor for LM2653MTCX-ADJ/NOPB?
A low-ESR aluminum, tantalum, or ceramic capacitor is required between VIN and PGND. For 1.5 A operation, a 10 µF–47 µF X5R/X7R ceramic capacitor rated ≥16 V is typical. A 0.1 µF ceramic capacitor in parallel reduces high-frequency noise. RMS current rating must exceed IOUT/2, peaking at VIN = 2×VOUT. The LM2653MTCX-ADJ/NOPB datasheet specifies this to prevent input voltage transients from disrupting regulation or triggering UVLO.
How does the LM2653MTCX-ADJ/NOPB enter and exit sleep mode?
The LM2653MTCX-ADJ/NOPB enters sleep mode when load current falls below ~100 mA (VIN = 5 V, VOUT = 2.5 V), causing output voltage to rise slightly and trigger the hysteretic comparator. Both MOSFETs turn off until VOUT drops to the lower hysteresis threshold (~24 mV below nominal), then resumes PWM. The LM2653MTCX-ADJ/NOPB exits sleep mode immediately upon load increase exceeding the threshold, restoring full 300 kHz operation without delay.
Can LM2653MTCX-ADJ/NOPB be used with an external Schottky diode?
Yes-an external Schottky diode (D1) is recommended across SW and PGND to prevent conduction through the low-side MOSFET's intrinsic body diode during dead time. This improves efficiency by 1–2%, especially at high input voltages and loads, and reduces EMI. The LM2653MTCX-ADJ/NOPB's design assumes D1 placement close to SW/PGND pins to minimize parasitic inductance, as specified in the TI application note SNVS050E.
What is the function of the LDELAY pin on LM2653MTCX-ADJ/NOPB?
The LDELAY pin sets the time delay between output voltage falling below 80% of nominal and activation of the undervoltage latch protection. A capacitor from LDELAY to ground charges at 5 µA; delay = CDELAY × 2 V / 5 µA. This prevents false latch events during brief load transients. Tying LDELAY to ground disables UV latch entirely. The LM2653MTCX-ADJ/NOPB uses this to enhance system robustness in dynamic power environments.
Is LM2653MTCX-ADJ/NOPB pin-compatible with LM2653MTC-ADJ/NOPB?
Yes-both LM2653MTCX-ADJ/NOPB and LM2653MTC-ADJ/NOPB share identical 16-pin TSSOP (PW) packaging, pinout, electrical specifications, and thermal characteristics. The only difference is tape-and-reel quantity: LM2653MTCX-ADJ/NOPB ships in 2500-unit reels, while LM2653MTC-ADJ/NOPB ships in 92-unit tubes. Functionally and mechanically, the LM2653MTCX-ADJ/NOPB is a direct replacement for LM2653MTC-ADJ/NOPB in all designs.
LM2653MTCX-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
LM2653MTCX-ADJ/NOPB FAQ
1.How can I place an order for LM2653MTCX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2653MTCX-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 LM2653MTCX-ADJ/NOPB reliable?
The price and inventory of LM2653MTCX-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 LM2653MTCX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2653MTCX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2653MTCX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2653MTCX-ADJ/NOPB?
LM2653MTCX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2653MTCX-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 LM2653MTCX-ADJ/NOPB?
For technical support, including LM2653MTCX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2653MTCX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2653MTCX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2653MTCX-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 LM2653MTCX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2653MTCX-ADJ/NOPB?
All LM2653MTCX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2653MTCX-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 LM2653MTCX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2653MTCX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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