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Texas Instruments LM3352MTCX-2.5
- Part No.:
- LM3352MTCX-2.5
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3352MTCX-2.5.pdf
- Description:
- IC REG CHARGE PUMP 2.5V 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,274
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Product details
Overview
LM3352MTCX-2.5 from National Semiconductor is a regulated switched-capacitor buck-boost DC/DC converter delivering 2.5 V ±3% output with up to 200 mA load current, operating from 2.5 V to 5.5 V input, and achieving >80% average efficiency in TSSOP-16 package - used for voltage translation in single-cell Li-ion portable systems.
For engineers reviewing the LM3352MTCX-2.5 datasheet, LM3352MTCX-2.5 pinout, LM3352MTCX-2.5 application, or LM3352MTCX-2.5 equivalent, key selection criteria include its 2.5 V fixed output, 1 MHz switching frequency, 400 µA typical operating current, shutdown quiescent current of 2.5 µA, and integrated over-temperature protection in battery-constrained designs.
Technical Context
The LM3352MTCX-2.5 implements a proprietary dual-loop digital control architecture: one analog comparator loop gates charge transfer to regulate VOUT, while a second digital control block selects among seven gain configurations to optimize efficiency across input and load variations. This enables seamless buck-boost operation without inductors.
It uses three external 0.33 µF ceramic flying capacitors (C1–C3), a 15 µF input capacitor, a 33 µF output capacitor, and a 1 µF X7R ceramic filter capacitor on CFIL. All nine GND pins must be connected to a common ground plane to maintain stability and thermal performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±3% - tightly regulated for noise-sensitive analog or low-voltage logic rails |
| Input Voltage Range | 2.5 V to 5.5 V - supports direct regulation from single Li-ion (2.7–4.2 V) or 3.3 V/5 V system rails |
| Max Output Current | 200 mA - sufficient for powering microcontrollers, sensors, or display bias in handheld devices |
| Switching Frequency | 1 MHz (0.65–1.35 MHz range) - enables compact 0.33 µF flying caps and reduces EMI filtering burden |
| Operating Quiescent Current | 400 µA typical - extends battery life in always-on or low-duty-cycle portable applications |
| Shutdown Current | 2.5 µA typical - minimizes leakage during system sleep or standby modes |
| Efficiency | >80% average - achieved across 15–150 mA loads, reducing thermal load in sealed enclosures |
| Thermal Protection | Integrated over-temperature shutdown - disables charge pump above 150 °C junction temperature |
Pinout & Package
TSSOP-16 package (NSC drawing MTC16), 4.4 mm × 5.0 mm footprint, 1.1 mm max height - optimized for ultra-thin portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 9, 12, 14, 16 | GND | All five ground pins must connect to a common low-impedance ground plane to ensure stable regulation and thermal dissipation |
| 2, 4, 6 | C3− / C2− / C1− | Negative terminals for flying capacitors - require short, symmetric traces to minimize parasitic inductance |
| 3, 5, 7 | C3+ / C2+ / C1+ | Positive terminals for flying capacitors - form charge-transfer paths for buck/boost operation |
| 8 | VOUT | Regulated 2.5 V output - connects directly to load; requires 33 µF output capacitor for ripple control |
| 10 | VIN | Main input supply (2.5–5.5 V); feeds internal regulator and switch array |
| 11 | NC | No-connect - must remain unconnected per datasheet; floating or tied to GND may disrupt operation |
| 13 | SD | Active-low shutdown control - driven by CMOS logic; pulls VOUT to near-zero when asserted |
| 15 | CFIL | Internal supply rail filter - requires 1 µF X7R ceramic capacitor to stabilize internal bias circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 2.5 V output | Eliminates need for external feedback resistors - simplifies layout and improves accuracy vs. adjustable variants |
| Buck-boost topology | Enables regulation both above and below VIN - critical for maintaining 2.5 V as Li-ion discharges from 4.2 V to 2.7 V |
| No inductors required | Reduces solution size, cost, and EMI - uses only ceramic flying and bulk capacitors |
| Dual-loop digital control | Automatically selects optimal gain configuration - maintains high efficiency across wide VIN and ILOAD ranges |
| Over-temperature protection | Self-limiting behavior under overload or short-circuit - prevents damage without external thermal management |
| Low-profile TSSOP-16 | 1.1 mm max height - fits behind displays or within slim handheld enclosures where Z-height is constrained |
Applications
| 1-cell Li-ion PDAs & Handheld PCs | Flat Panel Display Bias Rails |
|---|---|
|
Use Scenario: Powering core logic and interface ICs in palm-sized computing devices powered by a single Li-ion cell (2.7–4.2 V). IC Role / Device Role / Timing Role: Primary voltage regulator converting variable battery voltage to stable 2.5 V for microcontroller I/O, memory, and peripheral interfaces. Use Value: Maintains regulation across full battery discharge curve without requiring separate buck and boost stages - reducing component count and board area. |
Use Scenario: Generating precise bias voltages for TFT-LCD source/gate drivers in portable displays. IC Role / Device Role / Timing Role: Low-noise, fixed-output DC/DC stage supplying clean 2.5 V reference rails for analog pixel driver circuits. Use Value: Delivers <75 mVP-P ripple at 50 mA with 33 µF tantalum output cap - minimizing display artifacts and grayscale distortion. |
| NiMH/NiCd Portable Instruments | 3.3 V to 2.5 V Logic Translation |
|
Use Scenario: Regulating power for handheld test equipment using NiMH or alkaline batteries (1.2–1.5 V/cell × 2–4 cells). IC Role / Device Role / Timing Role: Buck-boost converter accepting 2.5–5.5 V input to deliver consistent 2.5 V for ADC references, op-amps, and sensor signal chains. Use Value: Operates down to 2.5 V input - supports full runtime from multi-cell alkaline packs without brownout during discharge. |
Use Scenario: Level-shifting between 3.3 V system rails and 2.5 V FPGA I/O banks or low-voltage memory interfaces. IC Role / Device Role / Timing Role: Efficient point-of-load regulator replacing linear regulators to reduce heat and extend battery life. Use Value: Achieves >75% efficiency at 150 mA load - dissipating only ~125 mW vs. ~850 mW for an LDO, enabling fanless enclosure design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost switched-capacitor DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8645ETE+T | 2.5 V fixed output; 200 mA; 1.2 MHz switching; requires 0.47 µF flying caps; no integrated thermal shutdown | Lacks over-temperature protection - requires external thermal monitoring in high-ambient environments | Preferred where higher switching frequency allows smaller flying caps, but adds system-level thermal management overhead |
| TPS60230RGTR | 2.5 V fixed output; 150 mA max; 1 MHz; 0.22 µF flying caps; integrated soft-start; 1.5 µA shutdown current | Lower max current and no thermal shutdown - unsuitable for sustained 200 mA loads or fault-prone environments | Selected for ultra-low shutdown current and soft-start in low-power sensor nodes where peak load ≤150 mA |
Compared with MAX8645ETE+T and TPS60230RGTR, the LM3352MTCX-2.5 offers superior thermal robustness via on-die over-temperature protection and higher guaranteed output current (200 mA), making it better suited for compact, thermally constrained portable systems without external thermal supervision.
Availability
LM3352MTCX-2.5 is available at Aetrix Electronics and suitable for portable medical monitors, handheld industrial scanners, and battery-powered IoT edge nodes requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LM3352MTCX-2.5 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
National Semiconductor was a U.S.-based analog and power management IC designer acquired by Texas Instruments in 2011; its legacy products remain widely deployed in industrial and portable electronics.
The LM3352 product line delivers regulated buck-boost conversion for space- and power-constrained battery-operated systems - designed specifically to replace inductor-based solutions with capacitor-only architectures.
FAQ
What is the input voltage range supported by the LM3352MTCX-2.5?
The LM3352MTCX-2.5 operates from 2.5 V to 5.5 V input. This range accommodates single-cell Li-ion (2.7–4.2 V), two-cell NiMH (2.4–3.0 V), and regulated 3.3 V or 5 V system rails. Operation below 2.5 V is not functional; above 5.5 V risks absolute maximum rating violation.
Does the LM3352MTCX-2.5 require external feedback resistors to set its output voltage?
No. The LM3352MTCX-2.5 is a fixed-output variant delivering 2.5 V ±3% without external resistors. Its regulation is implemented via internal precision reference and comparator circuitry - eliminating resistor tolerance errors and layout sensitivity associated with adjustable versions.
How many ground pins does the LM3352MTCX-2.5 have, and why are they important?
The LM3352MTCX-2.5 has five dedicated GND pins (pins 1, 9, 12, 14, 16). All must connect to a common low-impedance ground plane to ensure stable switching node referencing, minimize ground bounce, and support effective thermal conduction - critical for maintaining regulation accuracy and preventing oscillation.
What capacitor types and values are required for proper operation of the LM3352MTCX-2.5?
The LM3352MTCX-2.5 requires three 0.33 µF X7R ceramic flying capacitors (C1–C3), a 15 µF input capacitor (polymer or tantalum), a 33 µF output capacitor (tantalum recommended), and a 1 µF X7R ceramic on CFIL. Using non-X7R dielectrics for flying caps risks capacitance loss at temperature extremes.
Can the LM3352MTCX-2.5 start up into a 200 mA load?
No. The LM3352MTCX-2.5 is specified to start reliably only with ≤45 mA initial load. Full 200 mA load may be applied after regulation is established. For higher startup loads, a Power-On Reset circuit like the LP3470 is recommended to sequence enablement and prevent startup failure.
LM3352MTCX-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 200mA
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
LM3352MTCX-2.5 FAQ
1.How can I place an order for LM3352MTCX-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3352MTCX-2.5 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 LM3352MTCX-2.5 reliable?
The price and inventory of LM3352MTCX-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3352MTCX-2.5 is usually 5 days.
3.What payment methods are accepted for LM3352MTCX-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3352MTCX-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3352MTCX-2.5?
LM3352MTCX-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3352MTCX-2.5 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 LM3352MTCX-2.5?
For technical support, including LM3352MTCX-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3352MTCX-2.5 requirements.
6.How does Aetrix verify that LM3352MTCX-2.5 is sourced from the original manufacturer or authorized distributors?
All LM3352MTCX-2.5 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 LM3352MTCX-2.5 meets industry standards.
7.What is the process for return or replacement of LM3352MTCX-2.5?
All LM3352MTCX-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM3352MTCX-2.5, 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 LM3352MTCX-2.5 part is unused and in its original packaging.
Return procedure for LM3352MTCX-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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