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Texas Instruments LM3350MM/NOPB
- Part No.:
- LM3350MM/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM3350MM/NOPB.pdf
- Description:
- IC REG CHRG PUMP INV 50MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,354
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Product details
Overview
LM3350MM/NOPB from Texas Instruments (formerly National Semiconductor) is a CMOS switched-capacitor voltage converter IC that provides bidirectional 3.3V ↔ 5V DC-DC conversion without inductors-used as a step-up (3.3V→5V) or step-down (5V→3.3V) regulator in portable mixed-voltage systems. It delivers 50 mA load current with 90% typical efficiency, 4.2 Ω step-up and 1.8 Ω step-down output impedance, and operates at 800 kHz switching frequency.
For engineers reviewing the LM3350MM/NOPB datasheet, LM3350MM/NOPB pinout, LM3350MM/NOPB application, or LM3350MM/NOPB equivalent, this device is selected for compact, low-EMI power conversion where inductor-free design, battery-life optimization, and dual-rail interoperability between 3.3V logic and 5V peripherals are critical.
Technical Context
The LM3350MM/NOPB implements a fixed-ratio charge-pump architecture: 3/2 for step-up (e.g., 3.3V input → 5.0V no-load output) and 2/3 for step-down (e.g., 5.0V input → 3.3V no-load output). Its internal 1.6 MHz oscillator drives synchronous CMOS switches at 800 kHz, enabling use of four 0.33 µF ceramic capacitors with ≤0.33 Ω ESR.
It supports active-high enable control (1.7 V threshold), enters shutdown mode drawing only 250 nA typical quiescent current, and lacks short-circuit protection-requiring external design safeguards. Input voltage limits are 3.65 V (step-up) and 5.5 V (step-down), with operation specified from −40°C to +85°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Conversion Ratio | Fixed 3/2 (step-up) or 2/3 (step-down); enables precise rail translation without feedback loop complexity. |
| Output Voltage (No Load) | 5.0 V (step-up), 3.3 V (step-down); stable open-circuit output under nominal capacitor conditions. |
| Max Load Current | 50 mA; sufficient for powering small peripherals like USB transceivers or logic interface ICs. |
| Switching Frequency | 800 kHz (typical); allows use of low-cost, miniature 0.33 µF ceramic capacitors with minimal PCB area. |
| Power Efficiency | 90% (typical at 50 mA); minimizes thermal rise and extends battery runtime in portable devices. |
| Shutdown Current | 250 nA (typical); enables ultra-low-power system sleep states without auxiliary regulators. |
| Operating Temp Range | −40°C to +85°C; validated for industrial and consumer portable equipment environments. |
Pinout & Package
LM3350MM/NOPB is housed in an 8-pin Mini SOIC (SO-8) package (NSC drawing MUA08A), with exposed pad not electrically connected. Pin functions are dedicated to charge-pump capacitor terminals, dual-rail I/O, ground, and enable control-no shared or multiplexed pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Cap1+ | Positive terminal of first flying capacitor | Connects to high-side node of C1 during charge-transfer phase; requires low-ESR ceramic cap. |
| 2 - Cap1− | Negative terminal of first flying capacitor | Reference node for C1; tied to ground or Vlow depending on mode; must minimize trace inductance. |
| 3 - Cap2+ | Positive terminal of second flying capacitor | High-side node of C2; alternates polarity with Cap1+ to realize voltage doubling or halving. |
| 4 - Cap2− | Negative terminal of second flying capacitor | Shared return path with Cap1− in most configurations; layout proximity to IC critical for efficiency. |
| 5 - Vlow | Low-voltage rail terminal | Input in step-up mode (3.3V), output in step-down mode (3.3V); connects to system 3.3V domain. |
| 6 - Gnd | Power and signal reference | Common ground for all capacitors and enable logic; requires low-impedance plane connection. |
| 7 - Vhigh | High-voltage rail terminal | Output in step-up mode (5V), input in step-down mode (5V); connects to system 5V domain. |
| 8 - Enable | Active-high digital control input | CMOS-compatible logic input (1.7 V threshold); tie to Vlow or Vhigh to enable; ground to disable. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor topology | Eliminates magnetic components, EMI filters, and layout-sensitive inductor placement-reducing BOM cost and board space by >30% vs. inductive buck/boost. |
| Dual-direction conversion | Single IC supports both 3.3V→5V and 5V→3.3V translation via external capacitor reconfiguration-no redesign needed when system rail roles change. |
| 800 kHz fixed-frequency switching | Enables consistent capacitor sizing and predictable noise spectrum; avoids audible frequencies and simplifies EMI filtering. |
| 250 nA shutdown current | Permits integration into always-on subsystems (e.g., RTC power domains) without measurable battery drain over months. |
| Mini SO-8 footprint | Standard 3.9 mm × 4.9 mm outline with 1.27 mm pitch-compatible with automated assembly and legacy SOIC footprints. |
Applications
| Laptop Power Management | PCMCIA Card Interface |
|---|---|
Use Scenario: Providing regulated 5V supply to legacy PC Card peripherals from a 3.3V main system rail in ultraportable laptops. IC Role / Device Role / Timing Role: Bidirectional switched-capacitor voltage translator enabling interoperability between 3.3V host logic and 5V peripheral signaling standards. Use Value: Eliminates need for separate 5V DC-DC converter, reducing solution size and heat generation while maintaining ±3% output regulation at 50 mA. | Use Scenario: Generating 3.3V logic supply from 5V PCMCIA slot power for compliant 3.3V-only cards operating in Type II slots. IC Role / Device Role / Timing Role: Step-down charge-pump converter delivering clean, low-noise 3.3V rail with fast transient response for card controller ICs. Use Value: Achieves 3.2 V output at full 50 mA load with 1.8 Ω source impedance-ensuring stable operation under dynamic bus arbitration loads. |
| Handheld Instrumentation | Mixed-Voltage Sensor Interface |
Use Scenario: Powering 5V analog front-end (AFE) circuitry-including op-amps and ADC drivers-from a single-cell Li-ion battery (3.3V nominal) in portable DMMs. IC Role / Device Role / Timing Role: High-efficiency step-up voltage converter supplying precision analog rails without inductor-induced noise coupling. Use Value: Delivers 4.7 V at 50 mA with <100 mV ripple using 0.33 µF ceramics-meeting SNR requirements for 16-bit measurement accuracy. | Use Scenario: Level-shifting between 3.3V microcontroller GPIOs and 5V industrial sensors (e.g., analog-output pressure transducers) in battery-powered data loggers. IC Role / Device Role / Timing Role: Rail translator providing isolated, low-impedance 5V bias for sensor excitation while sharing ground with 3.3V digital domain. Use Value: Enables direct sensor connection without discrete level-shifters or optocouplers-reducing component count and improving long-term calibration stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Fixed 2× step-up only (no step-down); 100 kHz switching; requires larger 10 µF capacitors; ±1.5% output accuracy. | Suitable only for unidirectional 5V generation from 2.7–5.5V inputs-not for bidirectional rail translation. | Select when precise 2× multiplication and tighter output tolerance are required, and step-down functionality is unnecessary. |
| TPS60403DBVR | 2× step-up only; 1 MHz switching; 60 mA output; integrated soft-start; 1 µA shutdown current. | Optimized for low-noise, low-ripple 5V generation in medical wearables-lacks 2/3 step-down capability. | Choose for higher output current and lower quiescent current where bidirectional operation is not needed. |
Compared with MAX680ESA+ and TPS60403DBVR, LM3350MM/NOPB uniquely supports reversible 3.3V/5V translation in one package, trades ±1.5% output accuracy for dual-mode flexibility, and uses smaller 0.33 µF capacitors-making it optimal for space-constrained, mixed-rail portable designs requiring minimal external components.
Availability
LM3350MM/NOPB is available at Aetrix Electronics and suitable for laptop computers, handheld instrumentation, and PCMCIA interface circuits requiring stable component supply across extended product lifecycles despite its obsolete status.
Supply support for LM3350MM/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 legacy product support, documentation, and quality assurance for discontinued parts including the LM3350 series.
The LM3350 belongs to National Semiconductor's legacy power management portfolio, designed specifically for inductorless DC-DC conversion in battery-powered portable electronics where size, EMI, and efficiency are primary constraints.
FAQ
What is the function of the Enable pin on the LM3350MM/NOPB?
The Enable pin (Pin 8) is an active-high CMOS logic input with a 1.7 V threshold voltage. When pulled high to Vlow (in step-up mode) or Vhigh (in step-down mode), the LM3350MM/NOPB operates normally; when grounded, it enters shutdown mode drawing only 250 nA typical current. This pin directly controls internal switch activation and oscillator enable-no external pull-up resistor is required if tied to the appropriate rail.
Can the LM3350MM/NOPB be used for step-up and step-down simultaneously in the same circuit?
No-the LM3350MM/NOPB operates exclusively in one mode per configuration: either step-up (3.3V→5V) or step-down (5V→3.3V), determined by external capacitor connections and input/output rail assignments. Simultaneous bidirectional conversion is not supported; changing modes requires physical rework of capacitor routing and rail connections-not dynamic reconfiguration.
What capacitor values are required for stable operation of the LM3350MM/NOPB?
The LM3350MM/NOPB requires four 0.33 µF ±20% X7R ceramic capacitors (Cin, Cout, C1, C2), each with ESR ≤0.33 Ω at 1 MHz. These values are optimized for 50 mA load, 800 kHz switching, and minimal output ripple. Deviations reduce maximum output current or efficiency-e.g., using 0.1 µF capacitors lowers Zout-limited current to ~20 mA per the datasheet's Zout vs. C curve.
Is the LM3350MM/NOPB short-circuit protected?
No-the LM3350MM/NOPB is explicitly not short-circuit protected, as stated in the datasheet precautions section. Sustained output shorting will cause thermal overload and potential device failure. External current limiting (e.g., series resistor or polyfuse) or system-level fault detection must be implemented in designs where output faults are possible.
What is the maximum input voltage rating for the LM3350MM/NOPB in step-up mode?
In step-up mode, the LM3350MM/NOPB has a maximum input voltage rating of 3.65 V applied to the Vlow pin. Exceeding this limit risks damage to internal CMOS switches. This rating is distinct from step-down mode, where Vhigh accepts up to 5.5 V. Both limits are absolute maximum ratings-not recommended operating conditions-and derating is advised for reliability.
LM3350MM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Ratiometric
- 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):
- 3/2Vin, 2/3Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 50mA
- Frequency - Switching:
- 800kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LM3350MM/NOPB FAQ
1.How can I place an order for LM3350MM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3350MM/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 LM3350MM/NOPB reliable?
The price and inventory of LM3350MM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3350MM/NOPB is usually 5 days.
3.What payment methods are accepted for LM3350MM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3350MM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3350MM/NOPB?
LM3350MM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3350MM/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 LM3350MM/NOPB?
For technical support, including LM3350MM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3350MM/NOPB requirements.
6.How does Aetrix verify that LM3350MM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3350MM/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 LM3350MM/NOPB meets industry standards.
7.What is the process for return or replacement of LM3350MM/NOPB?
All LM3350MM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3350MM/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 LM3350MM/NOPB part is unused and in its original packaging.
Return procedure for LM3350MM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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