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Texas Instruments LM3352MTC-2.5/NOPB
- Part No.:
- LM3352MTC-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3352MTC-2.5/NOPB.pdf
- Description:
- IC REG CHARGE PUMP 2.5V 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,135
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Product details
Overview
LM3352MTC-2.5/NOPB from Texas Instruments (formerly 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 from 2.5 V–5.5 V input. It uses proprietary dual-loop digital control to auto-select optimal gain configuration and operates at 1 MHz typical switching frequency. Ideal for powering low-voltage logic in single-cell Li-ion portable systems.
For engineers reviewing the LM3352MTC-2.5/NOPB datasheet, LM3352MTC-2.5/NOPB pinout, LM3352MTC-2.5/NOPB application, or LM3352MTC-2.5/NOPB equivalent, key selection criteria include its ±3% output accuracy, 400 µA typical operating current, 2.5 µA shutdown current, TSSOP-16 package footprint, and buck-boost capability without inductors.
Technical Context
The LM3352MTC-2.5/NOPB implements a digitally controlled, dual-loop switched-capacitor architecture: one analog comparator loop gates charge transfer to maintain regulation, while a second digital control block selects among seven discrete gain configurations to maximize efficiency across input/output conditions. This eliminates external inductors and enables seamless transition between buck and boost modes.
Its internal phase generator drives a switch array configured for charge-pump operation using three 0.33 µF ceramic flying capacitors (C1–C3), with dedicated CFIL filtering (1 µF X7R) for internal rail stability. Over-temperature protection disables switching above 150°C junction temperature and auto-recovers upon cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±3% - tightly regulated for noise-sensitive 2.5 V logic rails (e.g., ADC references, low-voltage microcontrollers) |
| Input Voltage Range | 2.5 V to 5.5 V - supports direct connection to single-cell Li-ion (2.7–4.2 V), NiMH (0.9–1.4 V × 3), or 3.3 V/5 V system rails |
| Max Output Current | 200 mA - sufficient for powering multiple low-power peripherals (e.g., sensors, RF transceivers, display drivers) |
| Avg Efficiency | >80% - reduces thermal load and extends battery runtime in portable devices |
| Operating Quiescent Current | 400 µA typical - minimizes standby power loss in always-on subsystems |
| Shutdown Current | 2.5 µA typical - enables deep-sleep modes with negligible battery drain |
| Switching Frequency | 1 MHz typical - allows use of small, low-ESR ceramic capacitors and simplifies EMI filtering |
Pinout & Package
TSSOP-16 package (NS Package Number MTC16), 4.4 mm × 5.0 mm × 1.1 mm max height, exposed pad not present. All GND pins (1, 9, 12, 14, 16) must be connected to a common ground plane for thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 9, 12, 14, 16 | GND | Power and signal ground reference; all five pins must be shorted on PCB for stable regulation and thermal dissipation |
| 2, 4, 6 | C3− / C2− / C1− | Negative terminals for flying capacitors; connect to corresponding C+ pins via 0.33 µF X7R ceramics |
| 3, 5, 7 | C3+ / C2+ / C1+ | Positive terminals for flying capacitors; form charge-transfer network enabling buck/boost operation |
| 8 | VOUT | Regulated 2.5 V output; requires ≥33 µF output capacitor (tantalum/ceramic/polymer) for ripple control |
| 10 | VIN | Main input supply (2.5–5.5 V); decoupled by 15 µF input capacitor to suppress ripple and transient spikes |
| 11 | NC | No-connect pin; must remain unconnected per datasheet to avoid malfunction |
| 13 | SD | Active-low CMOS shutdown input; pulls <0.2×VIN to disable regulator and reduce quiescent current to 2.5 µA |
| 15 | CFIL | Internal supply filter node; requires 1 µF X7R ceramic capacitor to stabilize internal bias rails and reduce noise |
Key Features
| Feature | Design Value |
|---|---|
| Dual-loop digital regulation | Combines analog comparator feedback with digital gain selection to maintain ±3% VOUT accuracy across 2.5–5.5 V VIN and 1–200 mA loads |
| Inductorless buck-boost topology | Uses only ceramic flying capacitors (C1–C3) - eliminates magnetic components, reduces BOM cost and board area |
| Low-noise 1 MHz operation | Enables compact 0.33 µF flying caps and 1 µF CFIL filter, minimizing conducted EMI and easing layout in space-constrained handhelds |
| Thermal shutdown protection | Disables switching above 150°C TJ and auto-resumes when cooled - prevents damage during overload or poor heatsinking |
| Rail-compatible shutdown interface | CMOS-level SD pin accepts 0 V (shutdown) or >0.8×VIN (active) - directly driven by microcontroller GPIO without level-shifting |
Applications
| Portable Medical Sensors | Handheld Barcode Scanners |
|---|---|
|
Use Scenario: Powering ultra-low-power optical sensor arrays and BLE radio in disposable glucose monitors or pulse oximeters. IC Role / Device Role / Timing Role: Provides stable 2.5 V rail for precision analog front-end and 32-bit MCU core voltage, replacing inefficient LDOs. Use Value: 80%+ efficiency and 400 µA quiescent current extend single CR2032 battery life beyond 12 months in intermittent-use devices. |
Use Scenario: Supplying 2.5 V logic to CCD image sensor and laser driver in rugged industrial barcode readers. IC Role / Device Role / Timing Role: Acts as primary buck-boost regulator converting variable 3.0–4.2 V Li-ion voltage to fixed 2.5 V, supporting fast wake-up from sleep mode. Use Value: 200 mA output current handles peak laser pulse loads; 1 MHz switching avoids interference with image capture timing. |
| Wearable Health Trackers | Smart Card Readers |
|
Use Scenario: Delivering clean 2.5 V power to accelerometer, gyroscope, and Bluetooth SoC in wrist-worn fitness bands. IC Role / Device Role / Timing Role: Regulates voltage from worn-down 2.7–3.6 V Li-poly cell, maintaining system functionality down to end-of-charge. Use Value: TSSOP-16 footprint and inductorless design enable thin-profile PCB stacking; 2.5 µA shutdown current preserves battery during multi-week storage. |
Use Scenario: Generating 2.5 V for ISO/IEC 7816 smart card interface circuitry in USB-powered point-of-sale terminals. IC Role / Device Role / Timing Role: Converts 5 V USB input to regulated 2.5 V card supply, supporting hot-plug insertion and protocol-compliant voltage ramp. Use Value: ±3% output tolerance meets EMVCo smart card voltage spec; fast transient response ensures reliable card reset and data exchange. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS60230RGTR | Fixed 2.5 V output; 150 mA max; 2.7–5.5 V input; 1.2 MHz switching; requires 1 µF flying caps | Lacks digital gain optimization - lower efficiency below 100 mA; no over-temperature protection | Prefer LM3352MTC-2.5/NOPB where >200 mA load or thermal robustness is required |
| MAX881RASA+T | 2.5 V output; 100 mA max; 2.7–5.5 V input; 1 MHz; integrated soft-start; no thermal shutdown | Lower current rating limits use to light-load peripherals; higher quiescent current (600 µA) | Choose LM3352MTC-2.5/NOPB for battery-critical designs needing 200 mA and 400 µA IQ |
Compared with TPS60230RGTR and MAX881RASA+T, the LM3352MTC-2.5/NOPB delivers 200 mA at >80% efficiency with integrated thermal protection and tighter ±3% output accuracy - making it the preferred choice for high-reliability, high-current portable power rails.
Availability
LM3352MTC-2.5/NOPB is available at Aetrix Electronics and suitable for portable medical sensors, handheld barcode scanners, wearable health trackers, and smart card readers requiring stable component supply and long-term manufacturability.
Supply support for LM3352MTC-2.5/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 acquired National Semiconductor in 2011 and maintains full technical and supply chain support for legacy power management ICs including the LM3352 family.
The LM3352 belongs to TI's switched-capacitor DC/DC converter product line, designed specifically for inductorless, space-constrained battery-powered applications demanding regulated output with minimal external components.
FAQ
What is the guaranteed output voltage accuracy of the LM3352MTC-2.5/NOPB across temperature and load?
The LM3352MTC-2.5/NOPB guarantees ±3% output voltage accuracy over the full operating temperature range (−40°C to +85°C) and load current (1 mA to 100 mA) when VIN is between 2.8 V and 5.5 V. At 200 mA load and VIN = 4.0 V, the typical output remains within 2.425 V–2.575 V - confirmed in the Electrical Characteristics table of the official datasheet.
Can the LM3352MTC-2.5/NOPB operate from a single 1.5 V alkaline cell?
No, the LM3352MTC-2.5/NOPB requires a minimum input voltage of 2.5 V and cannot start or regulate from a single 1.5 V alkaline cell. It is designed for 2-cell alkaline (3.0 V), NiMH (2.4 V min), or single-cell Li-ion (2.7–4.2 V) sources. For 1.5 V inputs, consider TI's TPS60110 or similar ultra-low-VIN charge pumps.
What is the recommended flying capacitor value and dielectric for the LM3352MTC-2.5/NOPB?
The LM3352MTC-2.5/NOPB requires three 0.33 µF flying capacitors (C1, C2, C3) with X7R dielectric. X7R ensures stable capacitance across temperature (±15% from −55°C to +125°C) and low voltage coefficient - critical for consistent charge transfer and regulation accuracy. Ceramic types like AVX or Taiyo Yuden are validated per datasheet Table 2.
Does the LM3352MTC-2.5/NOPB require an external resistor divider to set output voltage?
No, the LM3352MTC-2.5/NOPB is a fixed-output device - the "-2.5" suffix denotes factory-trimmed 2.5 V regulation. Unlike adjustable regulators, it contains internal precision voltage reference and feedback network; no external resistors are needed or supported for VOUT adjustment.
How does thermal protection behave during sustained short-circuit on the VOUT pin of the LM3352MTC-2.5/NOPB?
Under VOUT short-circuit, the LM3352MTC-2.5/NOPB draws high current until junction temperature exceeds 150°C, triggering thermal shutdown. The device halts switching and holds VOUT near 0 V. Once TJ falls below ~135°C (typical hysteresis), regulation automatically resumes - no manual reset or power cycle is required.
LM3352MTC-2.5/NOPB 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-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
LM3352MTC-2.5/NOPB FAQ
1.How can I place an order for LM3352MTC-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3352MTC-2.5/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 LM3352MTC-2.5/NOPB reliable?
The price and inventory of LM3352MTC-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3352MTC-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM3352MTC-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3352MTC-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3352MTC-2.5/NOPB?
LM3352MTC-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3352MTC-2.5/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 LM3352MTC-2.5/NOPB?
For technical support, including LM3352MTC-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3352MTC-2.5/NOPB requirements.
6.How does Aetrix verify that LM3352MTC-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3352MTC-2.5/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 LM3352MTC-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM3352MTC-2.5/NOPB?
All LM3352MTC-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3352MTC-2.5/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 LM3352MTC-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM3352MTC-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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