My Inquiry
My Account
Texas Instruments LM5000-3MTC/NOPB
- Part No.:
- LM5000-3MTC/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5000-3MTC/NOPB.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:365
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM5000-3MTC/NOPB from Texas Instruments is a high-voltage current-mode PWM controller IC designed for flyback, boost, and forward DC/DC converter topologies. It integrates an 80V/2A NMOS power switch, supports 3.1V–40V input, offers pin-selectable 300kHz or 700kHz switching frequency, and delivers adjustable output voltage via external resistor divider - used in DSL modems and distributed power converters.
For engineers reviewing the LM5000-3MTC/NOPB datasheet, LM5000-3MTC/NOPB pinout, LM5000-3MTC/NOPB application, or LM5000-3MTC/NOPB equivalent, key selection criteria include internal switch voltage rating (80V), current limit (2A typ), thermal shutdown behavior, softstart timing control via external capacitor, and FS pin configuration for frequency selection.
Technical Context
The LM5000-3MTC/NOPB implements peak current-mode control with built-in slope compensation to suppress subharmonic oscillation above 50% duty cycle. Its error amplifier features 150–750 µmho transconductance and 280 V/V gain, with COMP pin enabling full external loop compensation using RC/CC networks.
It includes dedicated protection circuits: undervoltage lockout (2.74–3.10 V turn-on threshold), overtemperature shutdown (150°C junction limit), and switch current limiting (1.35–2.7 A). The FS pin selects between 300 kHz (grounded) and 700 kHz (open), with typical fS tolerance ±20% across temperature and input voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Internal Switch Rating | 80V breakdown voltage - supports high-input industrial or telecom supplies without external HV MOSFET. |
| Switch Current Limit | 2.0 A typical - sets maximum peak inductor current; enables robust overload handling in boost/flyback designs. |
| Input Voltage Range | 3.1 V to 40 V - accommodates wide-range DC inputs including 12 V, 24 V, and 36 V industrial rails. |
| Switching Frequency | 300 kHz (FS grounded) or 700 kHz (FS open) - higher frequency allows smaller magnetics and faster transient response. |
| Feedback Reference | 1.259 V ±2.4 mV - precise reference enables accurate output regulation; line regulation <0.04%/V ensures stability across input range. |
| Thermal Shutdown | 150°C junction temperature - protects die during sustained overload or poor heatsinking; auto-recovery on cooldown. |
| Softstart Control | External capacitor on SS pin - sets controlled ramp-up of COMP voltage to limit inrush current and prevent output overshoot. |
Pinout & Package
LM5000-3MTC/NOPB is packaged in a 16-lead thermally enhanced TSSOP (MTC) with exposed thermal pad. Pin 1 is COMP; pins 9–11 are paralleled SW terminals; pins 4–8 are ground connections (AGND/PGND); pin 16 is TEST (must be grounded).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (COMP) | Compensation network node | Connects to output of error amplifier; RC/CC network here sets loop stability poles/zeros for current-mode control. |
| 2 (FB) | Voltage feedback input | Monitors resistive divider output; regulates output by maintaining 1.259 V at this pin. |
| 3 (SHDN) | Enable/disable control | Open = enabled; grounded = disabled - supports remote ON/OFF sequencing in multi-rail systems. |
| 4–8 (AGND/PGND) | Analog & power ground | Separate AGND (pin 4) and PGND (pins 5–8) minimize noise coupling; connect directly to common ground plane. |
| 9–11 (SW) | Switch drain node | High-current path to internal NMOS; paralleled pins reduce resistance and improve thermal performance. |
| 12 (BYP) | Bypass capacitor connection | 0.1 µF ceramic capacitor decouples analog supply; critical for stable biasing of internal references. |
| 13 (VIN) | Analog power input | Supplies internal circuitry; RC filter (10 Ω + ≥0.1 µF) recommended to suppress line transients. |
| 14 (SS) | Softstart timing input | Internal 11 µA current source charges external capacitor; determines startup ramp time and inrush control. |
| 15 (FS) | Frequency select | Ground = 300 kHz; open = 700 kHz - configures oscillator without external components. |
| 16 (TEST) | Factory test terminal | Must be connected to ground in application; no functional role in normal operation. |
| Exposed Pad | Thermal interface | Connected to system ground plane; reduces θJA to 150°C/W (TSSOP) for reliable 125°C operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 80V/2A NMOS switch | Eliminates need for external high-voltage MOSFET and gate driver in medium-power flyback/boost designs. |
| Current-mode PWM control | Provides inherent cycle-by-cycle current limiting and superior line transient rejection without additional sensing circuitry. |
| Pin-selectable switching frequency | Enables layout optimization: 300 kHz for efficiency or 700 kHz for compact magnetics - no external clock required. |
| External compensation (COMP pin) | Allows full customization of loop dynamics for diverse output capacitors, loads, and topologies including discontinuous conduction mode. |
| Softstart with programmable timing | Prevents output overshoot and limits inrush current via user-selected capacitor - critical for powering sensitive downstream circuitry. |
| Comprehensive protection suite | Includes UVLO, overtemperature shutdown, current limit, and thermal foldback - ensures safe operation under fault conditions. |
Applications
| DSL Modem Power Supply | Distributed Telecom Power |
|---|---|
Use Scenario: Provides isolated 48 V output from 12 V or 24 V intermediate bus in DSL access equipment. IC Role / Device Role / Timing Role: Primary-side controller in flyback topology; regulates output via optocoupler feedback and controls switching frequency dynamically. Use Value: 80 V switch rating withstands reflected transients; 700 kHz operation enables small transformer and low-profile design meeting space-constrained CPE requirements. | Use Scenario: Generates multiple isolated outputs (±12 V, 3.3 V, 5 V) from 48 V telecom battery backup rail. IC Role / Device Role / Timing Role: Forward converter controller driving external synchronous rectifiers; uses FB pin for primary-side regulation with auxiliary winding sensing. Use Value: Adjustable output voltage and external compensation allow stable regulation across varying load profiles; thermal shutdown prevents failure during battery brownout events. |
| Industrial Boost Converter | Embedded System Auxiliary Supply |
Use Scenario: Steps up 12 V vehicle battery to 24 V for actuator drivers in automotive test equipment. IC Role / Device Role / Timing Role: Boost regulator controller with integrated switch; operates in continuous conduction mode with external inductor and diode. Use Value: 40 V max input handles cold-crank transients; 2 A current limit supports >15 W output; softstart prevents relay chatter during ignition cycles. | Use Scenario: Generates clean 5 V rail from noisy 12 V board supply for microcontroller and sensor subsystems. IC Role / Device Role / Timing Role: Non-isolated boost controller; uses FB divider and COMP network for tight regulation and EMI control. Use Value: 300 kHz switching minimizes conducted emissions; low quiescent current (2.5 mA) extends standby battery life in portable instrumentation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5002MTC/NOPB | Higher 100 V switch rating; same 2 A current limit; supports 500 kHz / 1 MHz frequency selection. | Required for >80 V input or higher reflected voltages in flyback designs; wider VIN range (3.1 V–75 V). | Select when input exceeds 40 V or transformer turns ratio demands higher switch BVDSS margin. |
| UCC28C43DR | Lower 75 V switch rating; 1 A current limit; fixed 1 MHz frequency; no softstart or external compensation. | Targeted at cost-sensitive, lower-power (<10 W) applications where loop tuning flexibility is not needed. | Choose for simplified, fixed-frequency boost designs with minimal external components and lower BOM cost. |
Compared with LM5000-3MTC/NOPB, LM5002MTC/NOPB extends input voltage capability and switch ruggedness for harsher environments, while UCC28C43DR trades configurability for integration and cost reduction in entry-level converters.
Availability
LM5000-3MTC/NOPB is available at Aetrix Electronics and suitable for DSL modems, distributed telecom power supplies, and industrial boost converters requiring stable component supply, long-term manufacturability, and TI-qualified reliability.
Supply support for LM5000-3MTC/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 is a global semiconductor leader delivering analog, embedded processing, and logic solutions with focus on reliability, precision, and energy efficiency.
The LM5000 product line targets high-voltage DC/DC conversion in space-constrained, thermally demanding applications such as broadband communications, industrial automation, and distributed power architecture - emphasizing integration, protection, and design flexibility.
FAQ
What is the maximum input voltage supported by the LM5000-3MTC/NOPB?
The LM5000-3MTC/NOPB supports an operating input voltage range of 3.1 V to 40 V. Absolute maximum rating for VIN is 40 V - exceeding this may cause permanent damage. For applications with transient spikes above 40 V, external clamping or filtering is required before the VIN pin.
How does the FS pin configure switching frequency on the LM5000-3MTC/NOPB?
On the LM5000-3MTC/NOPB, the FS pin selects between two frequencies: grounding FS sets 300 kHz operation, while leaving FS open (high-impedance) selects 700 kHz. This configuration is active at power-up and remains fixed until reset; no pull-up/pull-down resistors are needed beyond the chosen state.
Can the LM5000-3MTC/NOPB be used in flyback and boost topologies interchangeably?
Yes - the LM5000-3MTC/NOPB is explicitly designed for flyback, boost, and forward topologies. Its current-mode architecture, 80 V switch, and external compensation make it adaptable to all three. Design differences lie in transformer/inductor selection, snubber requirements, and feedback implementation - not IC functionality.
What is the purpose of the multiple PGND pins (pins 5–8) on the LM5000-3MTC/NOPB?
The LM5000-3MTC/NOPB allocates four dedicated PGND pins (5–8) to minimize power ground impedance and reduce voltage drop during high-current switching transitions. This improves current limit accuracy, reduces thermal stress on bond wires, and enhances EMI performance by providing low-inductance return paths for the 2 A switch current.
Does the LM5000-3MTC/NOPB require an external bootstrap capacitor?
No - the LM5000-3MTC/NOPB does not use a bootstrap capacitor. It integrates a charge pump and level-shifting circuitry to drive its internal NMOS switch directly from the VIN supply. The BYP pin (pin 12) requires only a 0.1 µF ceramic capacitor for analog supply decoupling, not high-side gate drive support.
LM5000-3MTC/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Flyback, Forward Converter
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.1V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 3.1V
- Voltage - Output (Max):
- 80V (Switch)
- Current - Output:
- 1.35A (Switch)
- Frequency - Switching:
- 300kHz, 700kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
LM5000-3MTC/NOPB FAQ
1.How can I place an order for LM5000-3MTC/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5000-3MTC/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 LM5000-3MTC/NOPB reliable?
The price and inventory of LM5000-3MTC/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5000-3MTC/NOPB is usually 5 days.
3.What payment methods are accepted for LM5000-3MTC/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5000-3MTC/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5000-3MTC/NOPB?
LM5000-3MTC/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5000-3MTC/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 LM5000-3MTC/NOPB?
For technical support, including LM5000-3MTC/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5000-3MTC/NOPB requirements.
6.How does Aetrix verify that LM5000-3MTC/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5000-3MTC/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 LM5000-3MTC/NOPB meets industry standards.
7.What is the process for return or replacement of LM5000-3MTC/NOPB?
All LM5000-3MTC/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5000-3MTC/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 LM5000-3MTC/NOPB part is unused and in its original packaging.
Return procedure for LM5000-3MTC/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM5000-3MTC/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
