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Texas Instruments LM3350MMX/NOPB
- Part No.:
- LM3350MMX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM3350MMX/NOPB.pdf
- Description:
- IC REG CHRG PUMP INV 50MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,586
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Product details
Overview
LM3350MMX/NOPB from Texas Instruments (formerly National Semiconductor) is a CMOS switched-capacitor voltage converter IC that provides bidirectional fixed-ratio DC-DC conversion: 3.3V-to-5V step-up or 5V-to-3.3V step-down. It delivers up to 50 mA load current with 90% typical efficiency, uses four 0.33 µF ceramic capacitors (no inductor), and operates at 800 kHz switching frequency in a Mini SO-8 package. It serves as a compact, low-EMI power rail translator in mixed-voltage portable systems.
For engineers reviewing the LM3350MMX/NOPB datasheet, LM3350MMX/NOPB pinout, LM3350MMX/NOPB application, or LM3350MMX/NOPB equivalent, key selection considerations include its dual-mode operation (3/2 or 2/3 ratio), 4.2 Ω step-up / 1.8 Ω step-down output impedance, 250 nA shutdown current, −40°C to +85°C operating range, and absence of short-circuit protection.
Technical Context
The LM3350MMX/NOPB implements a charge-pump architecture with internal CMOS switch arrays controlled by a 1.6 MHz oscillator (800 kHz effective switching frequency). Its fixed 3/2 or 2/3 voltage ratio is achieved through capacitor-based energy transfer without magnetic components - eliminating inductor-related EMI and size penalties.
It supports two distinct configurations: step-up mode (Vlow = input, Vhigh = output) requiring an external Schottky diode for startup biasing, and step-down mode (Vhigh = input, Vlow = output) requiring no external diode. Enable logic is CMOS-compatible with 1.7 V threshold and sub-µA leakage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Conversion Ratio | Fixed 3/2 (step-up) or 2/3 (step-down); enables deterministic rail translation without feedback loop design. |
| Output Current | 50 mA max; sufficient for powering small logic rails, interface buffers, or sensor subsystems in portable devices. |
| Efficiency | 90% typical at 50 mA; minimizes battery drain in always-on or duty-cycled applications. |
| Switch Frequency | 800 kHz; allows use of low-cost, small-footprint 0.33 µF ceramic capacitors with minimal PCB area. |
| Shutdown Current | 250 nA typical; enables ultra-low-power sleep states in battery-backed systems. |
| Operating Temp | −40°C to +85°C; qualified for industrial and extended commercial environments. |
| Output Impedance | 4.2 Ω (step-up), 1.8 Ω (step-down); defines load regulation and transient response capability. |
Pinout & Package
LM3350MMX/NOPB is housed in an 8-pin Mini SOIC (SO-8) package (NSC drawing MUA08A), measuring 4.9 mm × 3.9 mm × 1.75 mm, with standard gull-wing lead form and RoHS-compliant NiPdAu plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cap1+) | Charge pump capacitor positive terminal | Connects to positive plate of first flying capacitor; critical path for charge transfer timing and EMI control. |
| 2 (Cap1−) | Charge pump capacitor negative terminal | Return node for first flying capacitor; must be routed with low-inductance ground connection. |
| 3 (Cap2+) | Charge pump capacitor positive terminal | Connects to positive plate of second flying capacitor; forms complementary phase of charge cycle. |
| 4 (Cap2−) | Charge pump capacitor negative terminal | Return node for second flying capacitor; shares ground path with Cap1− for optimal layout. |
| 5 (Vlow) | Low-voltage rail terminal | Input in step-up mode; output in step-down mode - function depends on configuration wiring. |
| 6 (Gnd) | Power and signal reference | Main ground return for all internal circuitry and external capacitors; requires low-impedance plane connection. |
| 7 (Vhigh) | High-voltage rail terminal | Output in step-up mode; input in step-down mode - polarity and role are mode-dependent. |
| 8 (Enable) | CMOS logic enable input | Active-high control: ≥1.7 V enables operation; grounded disables IC and reduces current to 250 nA. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor design | Eliminates magnetic component cost, board space, and radiated EMI - ideal for noise-sensitive analog or RF sections. |
| Dual-mode operation | Single IC supports both 3.3V→5V and 5V→3.3V conversion via external wiring - reduces BOM count and inventory complexity. |
| Low quiescent current | 3.75 mA (step-up) / 2.5 mA (step-down) active mode current enables efficient light-load performance in intermittent-use systems. |
| Small footprint | Mini SO-8 package fits high-density layouts where QFN or TSSOP may not be manufacturable or cost-effective. |
| Capacitor-optimized frequency | 800 kHz switching enables use of inexpensive, stable X7R 0.33 µF ceramics - avoids costly tantalum or polymer alternatives. |
Applications
| PCMCIA Card Power Management | Laptop I/O Subsystem Rail Translation |
|---|---|
Use Scenario: A PCMCIA card with legacy 5V peripherals operates in a 3.3V host system. IC Role / Device Role / Timing Role: LM3350MMX/NOPB acts as a step-up converter, generating regulated 5V from the host's 3.3V supply. Use Value: Enables backward compatibility without redesigning card-level power architecture or adding bulky inductors. |
Use Scenario: A laptop motherboard integrates both 3.3V and 5V logic interfaces (e.g., USB transceivers, legacy UARTs). IC Role / Device Role / Timing Role: LM3350MMX/NOPB provides bidirectional rail translation between domains, configured per subsystem need. Use Value: Reduces discrete regulator count and simplifies power sequencing across mixed-voltage I/O blocks. |
| Handheld Instrumentation Signal Chain Biasing | PDA Memory Interface Voltage Matching |
Use Scenario: A battery-powered handheld multimeter requires precise 5V reference generation from a 3.3V LDO-supplied rail. IC Role / Device Role / Timing Role: LM3350MMX/NOPB supplies clean, low-noise 5V to ADC reference and op-amp bias circuits. Use Value: Delivers stable output with <4.2 Ω source impedance, minimizing reference drift under dynamic load changes. |
Use Scenario: A PDA uses DDR SDRAM requiring 2.5V or 3.3V I/O while main SoC runs at 1.8V–3.3V core voltage. IC Role / Device Role / Timing Role: LM3350MMX/NOPB steps down 5V system rail to 3.3V for memory interface termination and level-shifting. Use Value: Provides fast transient response (enabled by 1.8 Ω output impedance) to meet tight setup/hold timing margins. |
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× inverting charge pump; single-output polarity; 100 mA output; 10 kHz oscillator. | Only supports inverting conversion (e.g., +5V → −10V); unsuitable for non-inverting 3.3V/5V translation. | Select when negative rail generation is required; avoid for bidirectional positive rail translation. |
| TPS60230RTJR | 3.3V-to-5V only; integrated soft-start; 125 mA output; 500 kHz switching; 10-pin QFN. | Unidirectional step-up only; higher output current but lacks step-down capability and Mini SO-8 footprint. | Choose for higher-current 3.3V→5V needs where board space permits QFN and step-down is unnecessary. |
Compared with MAX680ESA+ and TPS60230RTJR, LM3350MMX/NOPB uniquely supports both step-up and step-down modes in one Mini SO-8 package with matched 3.3V/5V ratios - enabling flexible rail translation without changing PCB layout or BOM for dual-voltage system variants.
Availability
LM3350MMX/NOPB is available at Aetrix Electronics and suitable for laptop computers, handheld instrumentation, and PCMCIA cards requiring stable component supply, long-term obsolescence mitigation, and legacy design support.
Supply support for LM3350MMX/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 its precision analog and power management portfolio. TI is a global semiconductor leader focused on enabling intelligent, efficient, and connected systems.
The LM3350MMX/NOPB belongs to National Semiconductor's legacy switched-capacitor DC-DC converter family, designed specifically for low-EMI, inductor-free voltage translation in space-constrained portable and mixed-voltage embedded systems.
FAQ
What is the primary function of the LM3350MMX/NOPB?
The LM3350MMX/NOPB is a bidirectional switched-capacitor voltage converter that provides fixed-ratio DC-DC translation: 3.3V-to-5V step-up or 5V-to-3.3V step-down. It achieves this using four external ceramic capacitors and no inductor, delivering up to 50 mA with 90% typical efficiency. Its Mini SO-8 package and dual-mode flexibility make LM3350MMX/NOPB especially valuable in legacy portable designs where board space and EMI are constrained.
Does the LM3350MMX/NOPB require an external diode?
Yes - only in step-up configuration. The LM3350MMX/NOPB draws startup bias from Vhigh, so a Schottky diode (e.g., BAT54) is required between Vin and Vhigh to ensure initial turn-on when converting 3.3V to 5V. No diode is needed in step-down mode (5V-to-3.3V), as Vhigh is directly connected to the input rail. This requirement is explicitly documented in the LM3350MMX/NOPB datasheet Figure 2 and "Detailed Operation" section.
What are the absolute maximum ratings for input voltage on the LM3350MMX/NOPB?
The LM3350MMX/NOPB has asymmetric absolute maximum input ratings depending on mode: 3.65 V maximum on Vlow in step-up mode, and 5.5 V maximum on Vhigh in step-down mode. Exceeding either limit risks permanent damage. These values are specified in the "Absolute Maximum Ratings" table of the LM3350MMX/NOPB datasheet (SNIS101B) and must be respected during both steady-state and transient conditions.
Is the LM3350MMX/NOPB short-circuit protected?
No - the LM3350MMX/NOPB is explicitly not short-circuit protected, as stated in the "Precautions" section of its datasheet. If output is shorted, the device will attempt to sustain current until thermal shutdown or external current limiting intervenes. System-level protection (e.g., fuse, polyfuse, or upstream current-limiting regulator) must be implemented externally when using LM3350MMX/NOPB in applications where output faults are possible.
What capacitor values are recommended for the LM3350MMX/NOPB?
The LM3350MMX/NOPB datasheet specifies 0.33 µF ±20% ceramic capacitors (X7R dielectric preferred) for all four roles: Cin (input bypass), Cout (output hold), and C1/C2 (flying capacitors). These values optimize efficiency, output impedance, and ripple at 50 mA load. Deviating from 0.33 µF affects maximum output current and Zout - e.g., smaller capacitors reduce available current, while larger ones improve ripple but may degrade efficiency. All capacitors must have ESR ≤ 0.33 Ω at 1 MHz per LM3350MMX/NOPB specifications.
LM3350MMX/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
LM3350MMX/NOPB FAQ
1.How can I place an order for LM3350MMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3350MMX/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 LM3350MMX/NOPB reliable?
The price and inventory of LM3350MMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3350MMX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3350MMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3350MMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3350MMX/NOPB?
LM3350MMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3350MMX/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 LM3350MMX/NOPB?
For technical support, including LM3350MMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3350MMX/NOPB requirements.
6.How does Aetrix verify that LM3350MMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3350MMX/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 LM3350MMX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3350MMX/NOPB?
All LM3350MMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3350MMX/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 LM3350MMX/NOPB part is unused and in its original packaging.
Return procedure for LM3350MMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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