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Texas Instruments LM2653MTC-ADJ
- Part No.:
- LM2653MTC-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2653MTC-ADJ.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,370
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Product details
Overview
LM2653MTC-ADJ from Texas Instruments is a 1.5A synchronous step-down DC-DC switching regulator in a 16-pin TSSOP package, delivering adjustable output voltage (1.5V–5.0V) from a 4V–14V input. It achieves up to 97% efficiency using patented current-mode control and integrated high/low-side MOSFETs with 0.1Ω on-resistance, targeting battery-powered PDAs, notebook video supplies, and handheld scanners.
For engineers reviewing the LM2653MTC-ADJ datasheet, LM2653MTC-ADJ pinout, LM2653MTC-ADJ application, or LM2653MTC-ADJ equivalent, key selection criteria include its 300 kHz fixed-frequency PWM/hysteretic hybrid operation, 7 μA shutdown current, adjustable soft-start via SS pin, PGOOD flag with 81–108% output voltage monitoring, and thermal shutdown at 165°C.
Technical Context
The LM2653MTC-ADJ operates in constant-frequency current-mode PWM above 100 mA load and automatically transitions to low-power hysteretic mode below that threshold to maintain >80% efficiency at 15 mA. Its patented internal current sensing eliminates external sense resistors, reducing BOM count and noise susceptibility.
Protection architecture includes cycle-by-cycle current limiting (2.0 A typical), input undervoltage lockout (3.8 V rising threshold), output overvoltage (108% VOUT) and undervoltage (81% VOUT) latching protection with programmable delay via LDELAY pin, and thermal shutdown with 25°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 14V - supports wide-input battery and adapter-fed systems without pre-regulation |
| Output Voltage Range | 1.5V to 5.0V (adjustable) - set via external resistor divider; feedback reference = 1.238 V |
| Max Output Current | 1.5A - sustained continuous load capability with thermal derating above 25°C ambient |
| Switching Frequency | 300 kHz fixed - enables compact magnetics and low-profile output capacitors |
| Efficiency | Up to 97% - achieved via synchronous rectification and low RDS(ON) MOSFETs (75 mΩ typical) |
| Shutdown Current | 7 μA - minimizes battery drain in standby; shutdown pin threshold = 0.6 V (rising) |
| Thermal Shutdown | 165°C junction - latches off until reset by cycling shutdown pin or input supply |
Pinout & Package
LM2653MTC-ADJ is housed in a 16-pin TSSOP (PW0016A) package with exposed thermal pad, rated for −40°C to +125°C operating temperature and 140°C/W junction-to-ambient thermal resistance under no heatsink conditions.
| 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 and control logic; decoupled separately from VIN for noise immunity |
| 8, SD(SS) | Shutdown/Soft-start control | Pulling below 0.3 V disables regulator; capacitor to ground sets soft-start ramp time and current limit ramp |
| 9, FB | Feedback input | Monitors output voltage via resistor divider; internal reference = 1.238 V ±2.5% |
| 10, COMP | Compensation network | Connects external RC/C network to stabilize loop; Gm amplifier output with 80 kΩ output impedance |
| 11, PGOOD | Power-good flag | Open-drain output goes low if VOUT falls below 81% or exceeds 108% of nominal |
| 12, LDELAY | Undervoltage latch delay | Capacitor to ground sets delay (TDELAY = CDELAY × 2 V / 5 µA) before UVLO latch activates |
| 13, AGND | Analog ground | Reference for FB, COMP, and error amplifier; must be routed separately from PGND |
| 14–16, PGND | Power ground | Return path for high-current switches and input/output capacitors; tied to AGND at single point |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode losses; enables >97% peak efficiency and reduced thermal footprint |
| Patented current sensing | Replaces external current-sense resistor; improves noise immunity and saves PCB area/cost |
| Hybrid PWM/hysteretic mode | Maintains >80% efficiency down to 15 mA load without external mode-control circuitry |
| Adjustable PGOOD delay | LDELAY pin allows precise timing control of undervoltage latch activation to avoid false trips during transients |
| Integrated bootstrap regulator | Generates ~6.75 V gate drive for high-side MOSFET; eliminates need for external charge pump |
Applications
| Personal Digital Assistants (PDAs) | Notebook Computer Video Supply |
|---|---|
Use Scenario: Powering core logic and display interface in portable PDA platforms with Li-ion battery input (3.0–4.2 V). IC Role / Device Role / Timing Role: Primary buck converter regulating 3.3 V or 2.5 V system rail from variable battery voltage. Use Value: 97% efficiency extends battery runtime; 7 μA shutdown current preserves charge during suspend mode. | Use Scenario: Delivering stable 5 V or 3.3 V to LCD backlight drivers and GPU I/O in ultra-thin notebooks. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter stepping down 12 V or 19 V adapter input. Use Value: 300 kHz fixed frequency enables small inductors (<2.2 µH); thermal shutdown prevents damage during GPU burst loads. |
| Battery-Powered Handheld Scanners | Computer Peripherals (USB Hubs, Docking Stations) |
Use Scenario: Providing regulated 5 V and 3.3 V rails for CMOS image sensor, MCU, and USB PHY in cordless barcode scanners. IC Role / Device Role / Timing Role: Dual-rail power source with independent feedback paths and PGOOD monitoring per rail. Use Value: Adjustable soft-start prevents inrush current tripping host battery protection circuits; 1.5A output sustains motor-assisted scanning bursts. | Use Scenario: Powering USB 3.0 controller, Type-C PD negotiation IC, and auxiliary logic in active docking stations. IC Role / Device Role / Timing Role: Primary 5 V buck regulator feeding downstream LDOs and load switches. Use Value: Input UVLO (3.8 V) prevents brownout during adapter plug/unplug; PGOOD flag enables safe hot-plug detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3 MHz switching frequency, 95% efficiency, 2.7–6 V input, fixed 3.3 V output (non-adjustable) | Higher frequency enables smaller passives but less suitable for high-current, low-EMI industrial use | Choose for space-constrained USB-powered devices where fixed 3.3 V suffices and EMI filtering is prioritized |
| LM2678SD-ADJ/NOPB | 63 kHz frequency, 5 A output, TO-263 package, higher quiescent current (50 mA) | Better thermal handling for continuous high-load operation but larger footprint and lower light-load efficiency | Prefer for industrial 24 V input systems needing >2 A sustained current and robust thermal margin |
Compared with TPS62130ARGTR and LM2678SD-ADJ/NOPB, the LM2653MTC-ADJ uniquely balances 1.5A capability, 300 kHz operation for cost-effective magnetics, and sub-10 μA shutdown-making it optimal for mid-power portable designs requiring adjustable output and battery longevity.
Availability
LM2653MTC-ADJ is available at Aetrix Electronics and suitable for battery-powered handheld scanners, notebook computer video supplies, and personal digital assistants requiring stable component supply and long-term production continuity.
Supply support for LM2653MTC-ADJ 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.
The LM2653 product line was designed specifically for portable and battery-operated applications demanding high efficiency across wide load ranges, minimal external components, and robust protection in compact TSSOP packages.
FAQ
What is the recommended input capacitor configuration for LM2653MTC-ADJ?
A low-ESR aluminum, tantalum, or ceramic capacitor is required between VIN and PGND. For RMS current handling, select capacitance such that ripple current rating exceeds IOUT/2. Use ≥25% higher voltage rating than max input (e.g., 16 V for 14 V VIN). Add a 0.1 µF ceramic capacitor directly at the VIN pin to suppress high-frequency spikes. The LM2653MTC-ADJ datasheet specifies this configuration to prevent input voltage transients from disrupting regulation or triggering UVLO.
How does the LM2653MTC-ADJ enter and exit sleep mode?
The LM2653MTC-ADJ enters sleep (hysteretic) mode when load current drops below ~100 mA (ISM threshold), causing output voltage to rise slightly and trigger the internal hysteretic comparator. Both MOSFETs turn off until VOUT falls to the lower hysteresis threshold (~24 mV below nominal), then resumes PWM operation. Exit occurs automatically when load increases above ISM. This behavior is intrinsic to the LM2653MTC-ADJ's control architecture and requires no external intervention.
Can the LM2653MTC-ADJ be used with an input voltage below 4 V?
No. The LM2653MTC-ADJ has a guaranteed operating input range of 4 V to 14 V, with input undervoltage lockout (UVLO) activating at 3.8 V (rising edge) and 3.59 V (falling edge due to 210 mV hysteresis). Operation below 4 V is outside specification and may result in unstable regulation, failure to start, or undefined protection behavior. The LM2653MTC-ADJ is not rated for 3.3 V or Li-ion battery direct input without pre-buck.
What is the purpose of the external Schottky diode recommended in the LM2653MTC-ADJ datasheet?
The external Schottky diode (D1) prevents conduction through the intrinsic body diode of the internal low-side MOSFET during dead time and hysteretic mode. Body diode conduction causes reverse-recovery losses and increased switching loss in the high-side MOSFET, degrading efficiency by 1–2%. The LM2653MTC-ADJ benefits most from D1 at high VIN and high IOUT; TI recommends placing D1 physically adjacent to SW and PGND pins to minimize parasitic inductance.
How is the output voltage adjusted on the LM2653MTC-ADJ?
The LM2653MTC-ADJ uses a resistor divider (R1, R2) from VOUT to FB to GND. Output voltage is calculated as VOUT = 1.238 V × (1 + R1/R2). TI recommends 1% metal-film resistors between 10 kΩ and 100 kΩ for R1 and R2. The FB pin accepts 1.200–1.263 V (min/max) for regulation; deviation beyond this range causes output inaccuracy. This adjustment method is confirmed in the LM2653MTC-ADJ Electrical Characteristics table and Design Procedure section.
LM2653MTC-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
LM2653MTC-ADJ FAQ
1.How can I place an order for LM2653MTC-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2653MTC-ADJ 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 LM2653MTC-ADJ reliable?
The price and inventory of LM2653MTC-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2653MTC-ADJ is usually 5 days.
3.What payment methods are accepted for LM2653MTC-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2653MTC-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2653MTC-ADJ?
LM2653MTC-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2653MTC-ADJ 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 LM2653MTC-ADJ?
For technical support, including LM2653MTC-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2653MTC-ADJ requirements.
6.How does Aetrix verify that LM2653MTC-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2653MTC-ADJ 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 LM2653MTC-ADJ meets industry standards.
7.What is the process for return or replacement of LM2653MTC-ADJ?
All LM2653MTC-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2653MTC-ADJ, 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 LM2653MTC-ADJ part is unused and in its original packaging.
Return procedure for LM2653MTC-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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