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Texas Instruments LM2653MTCX-ADJ
- Part No.:
- LM2653MTCX-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2653MTCX-ADJ.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,655
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Product details
Overview
LM2653MTCX-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 4V–14V input with up to 97% efficiency and 300 kHz fixed-frequency operation. It integrates high-side/low-side MOSFETs, patented current-sensing circuitry, and protections including thermal shutdown, input UVLO, and output over/undervoltage latching - optimized for battery-powered portable electronics requiring stable, high-efficiency power conversion.
For engineers reviewing the LM2653MTCX-ADJ datasheet, LM2653MTCX-ADJ pinout, LM2653MTCX-ADJ application, or LM2653MTCX-ADJ equivalent, key selection criteria include its 7 µA shutdown current, 0.1 Ω typical switch RDS(ON), adjustable soft-start via SS pin, PGOOD flag with programmable delay, and compatibility with low-profile external components for space-constrained designs.
Technical Context
The LM2653MTCX-ADJ operates in constant-frequency current-mode PWM at 300 kHz under moderate-to-heavy loads and automatically transitions to hysteretic "sleep" mode below ~100 mA to maintain >80% efficiency at 15 mA. Its patented internal current sensing eliminates the need for an external sense resistor, improving noise immunity and reducing BOM cost and board area.
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 with user-programmable delay via LDELAY pin, and thermal shutdown at 165°C with 25°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 14 V - supports wide-input battery and adapter-fed systems without pre-regulation. |
| Output Voltage Range | 1.5 V to 5.0 V (adjustable via FB resistive divider) - enables precise core/I/O rail generation for microcontrollers and peripherals. |
| Max Output Current | 1.5 A continuous - sufficient for powering DSPs, FPGAs, and display drivers in portable devices. |
| Switching Frequency | 300 kHz fixed - allows use of compact, low-profile inductors and capacitors while avoiding AM radio band interference. |
| Efficiency | Up to 97% - minimizes thermal load and extends battery life in handheld applications. |
| Shutdown Current | 7 µA - enables ultra-low-power standby states in always-on or wake-on-event systems. |
| Feedback Voltage | 1.238 V (typical) - sets output accuracy and stability; used with external R1/R2 to program VOUT. |
| Thermal Shutdown | 165°C junction temperature - protects against sustained overload or poor heatsinking in sealed enclosures. |
Pinout & Package
LM2653MTCX-ADJ is housed in a 16-pin TSSOP (PW0016A) package with exposed thermal pad (not electrically connected), rated for −40°C to +125°C operating junction temperature and moisture sensitivity level 1 (260°C reflow).
| 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 external Schottky diode anode. |
| 3–5, VIN | Main power supply input | High-current input path feeding high-side MOSFET drain and internal bias circuits; requires low-ESR bulk capacitor. |
| 6, VCB | Bootstrap capacitor connection | Provides gate drive voltage for high-side MOSFET; requires 0.1 µF ceramic capacitor to PGND. |
| 7, AVIN | Analog control supply | Powers error amplifier, oscillator, and protection comparators; decoupled separately from VIN for noise immunity. |
| 8, SD(SS) | Shutdown / Soft-start control | Pulling below 0.3 V disables regulator; capacitor to ground controls ramp-up time and prevents inrush current. |
| 9, FB | Feedback input | Senses output voltage via resistive divider; regulates VOUT to 1.238 V reference; sensitive to noise - requires short trace routing. |
| 10, COMP | Compensation network | Connects external RC/C network to stabilize loop response; critical for transient performance and phase margin. |
| 11, PGOOD | Power-good flag output | Open-drain signal goes low if VOUT deviates >±20% from nominal; enables system sequencing and fault reporting. |
| 12, LDELAY | Undervoltage latch delay | Capacitor to ground sets time delay (T = C × 2 V / 5 µA) before UVLO latching activates after VOUT drops below 81%. |
| 13, AGND | Analog ground reference | Low-noise return for feedback, compensation, and internal analog blocks; must be separated from PGND at single point. |
| 14–16, PGND | Power ground | High-current return path for MOSFETs and input/output capacitors; requires wide copper pour and low-inductance layout. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode losses; achieves up to 97% efficiency across 100:1 load range (15 mA–1.5 A). |
| Patented current sensing | Replaces external current-sense resistor; reduces component count, PCB area, and noise susceptibility in current-mode control. |
| Adjustable soft-start | Programmable ramp time via SS pin capacitor prevents input inrush and output overshoot during power-up. |
| Programmable PGOOD delay | LDELAY pin allows configurable hold-off time before UVLO latching, preventing false trips during transient load steps. |
| Integrated protections | Includes thermal shutdown, input UVLO, output OVP/UVP latching, and cycle-by-cycle current limit - no external supervision IC needed. |
| Low quiescent current | 1.7 mA operating IQ and 7 µA shutdown current extend runtime in battery-critical applications like PDAs and scanners. |
Applications
| Personal Digital Assistants (PDAs) | Handheld Scanners |
|---|---|
Use Scenario: Powering ARM-based application processors and LCD controllers from single-cell Li-ion (3.0–4.2 V) or dual-cell NiMH (2.4–3.0 V) batteries. IC Role / Device Role / Timing Role: Primary buck converter generating 3.3 V I/O and 1.8 V core rails with tight regulation and fast transient response. Use Value: 97% peak efficiency and 7 µA shutdown current maximize usable battery capacity; sleep mode maintains >80% efficiency at standby currents as low as 15 mA. |
Use Scenario: Supplying image sensor, laser driver, and microcontroller in compact barcode scanners powered by AA/AAA alkaline cells (1.8–3.2 V). IC Role / Device Role / Timing Role: Adjustable-output regulator set to 2.5 V or 3.3 V with programmable soft-start to prevent brownout during motor activation. Use Value: Input UVLO (3.8 V) prevents erratic operation near battery depletion; PGOOD flag enables firmware-controlled power sequencing and low-battery alerts. |
| Notebook Computer Video Supply | Battery-Powered Devices |
Use Scenario: Generating dedicated 1.5 V or 1.8 V supply for GPU memory or display interface ICs in ultraportable notebooks. IC Role / Device Role / Timing Role: High-current (1.5 A), low-noise synchronous buck converter with AGND/PGND separation to minimize EMI coupling into analog video paths. Use Value: 300 kHz fixed frequency avoids interference with video clock harmonics; integrated current sensing ensures stable regulation under dynamic pixel-load transients. |
Use Scenario: General-purpose high-efficiency power conversion in portable medical monitors, wireless sensors, and IoT edge nodes. IC Role / Device Role / Timing Role: Flexible, protected DC-DC solution supporting multiple output voltages via FB divider; compatible with standard 0805/1206 passives. Use Value: TSSOP-16 package enables automated assembly; RoHS-compliant green finish and MSL-1 rating simplify manufacturing; full thermal and overvoltage protection reduce system-level validation effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54331DR | 3.5–28 V input, 3 A output, 570 kHz switching, integrated 95 mΩ HS/LS MOSFETs; no LDELAY or PGOOD delay programming. | Better suited for higher-input industrial supplies; lacks programmable UVLO delay and fine-grained PGOOD timing control. | Select when higher input voltage or output current is required; verify layout compatibility due to different pinout and thermal pad configuration. |
| LM2678-ADJ | 4–40 V input, 5 A output, 260 kHz, external MOSFETs required; no sleep mode, higher 5 mA quiescent current. | Targeted at high-power, non-battery applications; lacks light-load efficiency optimization and integrated current sensing. | Choose for ruggedized 5 A designs where efficiency at 15 mA is not critical; expect larger solution size and additional external components. |
Compared with TPS54331DR and LM2678-ADJ, the LM2653MTCX-ADJ offers superior light-load efficiency via hysteretic sleep mode, lower shutdown current, and unique programmable protection timing - making it optimal for portable battery life-critical systems despite its lower 1.5 A rating and 14 V max input.
Availability
LM2653MTCX-ADJ is available at Aetrix Electronics and suitable for personal digital assistants (PDAs), handheld scanners, notebook computer video supplies, and other battery-powered devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2653MTCX-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 connectivity technologies, with decades of expertise in power management IC design and high-volume manufacturing.
The LM2653 belongs to TI's legacy high-efficiency synchronous buck regulator family, engineered specifically for portable electronics demanding extended battery runtime, compact footprint, and robust protection in variable-load environments.
FAQ
What is the recommended input capacitor for LM2653MTCX-ADJ?
A low-ESR aluminum, tantalum, or ceramic capacitor is required between VIN and PGND. For maximum 14 V input, use ≥17.5 V-rated aluminum/ceramic or ≥28 V-rated tantalum. A 0.1 µF ceramic capacitor in parallel reduces high-frequency noise. RMS current rating must handle up to IOUT/2, peaking when VIN ≈ 2×VOUT. The LM2653MTCX-ADJ datasheet specifies this requirement to ensure stable operation and minimize input voltage ripple.
Does LM2653MTCX-ADJ require an external Schottky diode?
Yes - an external Schottky diode is recommended across SW and PGND to prevent conduction through the intrinsic body diode of the internal low-side MOSFET during dead time. This improves efficiency by 1–2%, especially at higher input voltages and loads, and reduces switching loss and noise. The LM2653MTCX-ADJ design guide specifies D1 breakdown voltage ≥1.25×VIN(MAX) and average current rating >30% of 1.5 A.
How is output voltage adjusted on LM2653MTCX-ADJ?
VOUT is set using a resistive divider from output to FB pin and from FB to AGND. The formula is VOUT = 1.238 V × (1 + R1/R2), where R1 connects to output and R2 to AGND. TI recommends 10 kΩ–100 kΩ metal-film resistors with ≥1% tolerance. The LM2653MTCX-ADJ's 1.238 V feedback reference ensures accurate regulation across temperature and load conditions.
What is the function of the LDELAY pin on LM2653MTCX-ADJ?
The LDELAY pin sets the time delay between VOUT falling below 81% of nominal and activation of the undervoltage latch protection. A capacitor from LDELAY to AGND creates this delay: TDELAY = CDELAY × 2 V / 5 µA. Tying LDELAY to AGND disables the delay. This feature prevents false latch trips during brief load transients - a key capability of the LM2653MTCX-ADJ in real-world portable applications.
Can LM2653MTCX-ADJ operate with input voltage below 4 V?
No - the LM2653MTCX-ADJ has a guaranteed operating input range of 4 V to 14 V per its Absolute Maximum and Operating Ratings. Input undervoltage lockout triggers at 3.8 V (rising edge), and the device will not start or sustain regulation below 4 V. Attempting operation below this threshold may result in unstable output or failure to enable; the LM2653MTCX-ADJ is not specified for sub-4 V battery chemistries like fully depleted Li-ion.
LM2653MTCX-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
LM2653MTCX-ADJ FAQ
1.How can I place an order for LM2653MTCX-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2653MTCX-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 LM2653MTCX-ADJ reliable?
The price and inventory of LM2653MTCX-ADJ 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 is usually 5 days.
3.What payment methods are accepted for LM2653MTCX-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2653MTCX-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2653MTCX-ADJ?
LM2653MTCX-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2653MTCX-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 LM2653MTCX-ADJ?
For technical support, including LM2653MTCX-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2653MTCX-ADJ requirements.
6.How does Aetrix verify that LM2653MTCX-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2653MTCX-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 LM2653MTCX-ADJ meets industry standards.
7.What is the process for return or replacement of LM2653MTCX-ADJ?
All LM2653MTCX-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2653MTCX-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 LM2653MTCX-ADJ part is unused and in its original packaging.
Return procedure for LM2653MTCX-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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