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Texas Instruments LM2633MTD/NOPB
- Part No.:
- LM2633MTD/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Special Purpose Regulators
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
LM2633MTD/NOPB.pdf
- Description:
- IC REG CTRLR CPU 3OUT 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,613
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Product details
Overview
LM2633MTD/NOPB from Texas Instruments is an advanced two-phase synchronous triple regulator controller designed for notebook CPU power supplies, featuring three regulated outputs (0.925–2.00 V, 1.3–6.0 V, and linear), 4.5–30 V input range, 250 kHz fixed-frequency switching, and Intel mobile VID compatibility.
For engineers reviewing the LM2633MTD/NOPB datasheet, LM2633MTD/NOPB pinout, LM2633MTD/NOPB application, or LM2633MTD/NOPB equivalent, this device supports dynamic voltage scaling in portable computing systems requiring precise multi-rail sequencing, high-efficiency light-load operation via skip mode, and robust fault protection including UVP/OVP and thermal shutdown.
Technical Context
The LM2633MTD/NOPB integrates two current-mode synchronous buck controllers operating 180° out of phase to reduce input ripple RMS current, plus a dedicated linear regulator controller with 50 mA drive capability. Channel 1 uses a precision 5-bit VID DAC (±1.5% accuracy) for CPU core voltage, while Channel 2 offers adjustable output (±1.7% initial tolerance) and independent soft-start.
It employs VDS-based current sensing-eliminating external sense resistors-and features analog soft-start independent of input slew rate, programmable UV delay, FPWM control for forced PWM mode, and separate gate-drive outputs (HDRV/LDRV) with specified on-resistance and current drive (e.g., HDRV1 source/sink ≥1.2 A/1.0 A).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 30 V - supports multiple battery chemistries and wide-input industrial DC sources. |
| Channel 1 Output Range | 0.925 V to 2.00 V - Intel-compatible VID-programmable core voltage for mobile CPUs. |
| Channel 2 Output Range | 1.3 V to 6.0 V - independently adjustable auxiliary rail with ±1.7% initial tolerance. |
| Switching Frequency | 225–275 kHz (typ. 250 kHz) - fixed-frequency operation enabled by FPWM pin; reduces EMI filtering burden. |
| DAC Accuracy (Ch1) | ±1.5% from 0°C to 125°C - ensures stable CPU voltage under thermal stress without recalibration. |
| Power Good Function | Window detector with 89–98% (PGOOD low→high) and 84–88% (high→low) thresholds - enables reliable system power sequencing. |
| Thermal Shutdown | Active junction temperature limit at ~150°C - prevents permanent damage during overload or poor heatsinking. |
Pinout & Package
LM2633MTD/NOPB is housed in a 48-lead TSSOP package (Package Number DGG0048A) with exposed thermal pad for enhanced thermal performance in high-power notebook applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1 (Pin 1) | Channel 1 feedback input | Direct connection to CPU core VOUT for closed-loop regulation; sets 0.925–2.00 V output via VID code. |
| ON/SS1 (Pin 4) | Channel 1 enable & soft-start | Capacitor-based soft-start minimizes inrush; <0.8 V disables channel; dual low enables full IC shutdown. |
| VID4–VID0 (Pins 6–10) | Voltage ID code inputs | 5-bit open-collector interface accepting Intel VID codes per Table 3; internal pull-ups simplify host connection. |
| PGOOD (Pin 13) | Power good status output | Open-drain signal indicating all three outputs are within ±10% window; used for processor reset or system enable. |
| HDRV1 / LDRV1 (Pins 44/40–41) | Channel 1 high/low-side gate drivers | Floating high-side driver (HDRV1) rides on SW1; low-side (LDRV1) sinks 2.0 A - drives external N-MOSFETs directly. |
| ILIM1 (Pin 48) | Channel 1 current limit threshold | Sinks constant 10 µA; resistor-to-SW1 sets overcurrent trip point via VDS sensing - no sense resistor needed. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase 180° interleaving | Reduces input capacitor RMS current by ~30%, enabling smaller bulk capacitance and lower EMI filter cost. |
| VDS-based current sensing | Eliminates external current-sense resistors, improving efficiency and reducing board area versus shunt-based solutions. |
| Independent analog soft-start | Soft-start timing unaffected by VIN slew rate - ensures repeatable startup behavior across varying input conditions. |
| Programmable UV delay | Capacitor on UV_DELAY (Pin 11) sets hold-off time before UVP latch activation - avoids false trips during input transients. |
| FPWM pin control | Forces constant-frequency PWM mode (disables skip-mode) - essential for noise-sensitive applications like audio subsystems. |
Applications
| Mobile CPU Power Supply | Notebook System Rail Generator |
|---|---|
|
Use Scenario: Power delivery to Intel Pentium M/Core Solo/Core Duo mobile processors requiring dynamic VID voltage scaling. IC Role / Device Role / Timing Role: Triple-output controller managing CPU core (Ch1), I/O/memory (Ch2), and bias/reference (Ch3 linear) rails with synchronized sequencing. Use Value: Enables SpeedStep™-compliant voltage transitions with <2 mV load regulation error and sub-10 µs transient response. |
Use Scenario: Generating 3.3 V, 5 V, and 1.8 V rails for chipset, display, and peripheral logic in ultra-thin notebooks. IC Role / Device Role / Timing Role: Primary multi-rail PMIC replacing discrete controllers; provides PGOOD coordination and UV/OV fault reporting. Use Value: Reduces component count by integrating three regulators and eliminates need for external current-sense resistors. |
| Information Appliance PSU | Low-Voltage Buck Reference Design |
|
Use Scenario: Power solution for portable media players or thin clients needing compact, efficient multi-output conversion. IC Role / Device Role / Timing Role: Central regulator controller driving external MOSFETs; manages soft-start, fault latching, and VID updates. Use Value: Achieves >85% efficiency at 10% load via pulse-skip mode, extending battery runtime without sacrificing transient performance. |
Use Scenario: Engineering reference platform for evaluating synchronous buck topologies with integrated gate drivers. IC Role / Device Role / Timing Role: Controller evaluation vehicle demonstrating VDS sensing, interleaved phase control, and FPWM mode validation. Use Value: Provides validated layout, BOM, and compensation network design - accelerates development of custom 250 kHz buck converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-output buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS51220RGER | Single-chip dual-phase controller with integrated MOSFET drivers; lacks linear regulator channel and VID DAC. | Targets DDR memory + core voltage only; not suitable for 3-rail notebook CPU designs requiring linear bias. | Select when system needs only two switching rails and higher integration density outweighs loss of Ch3 flexibility. |
| ISL95831IRZ | Three-output controller with VID support and integrated gate drivers; operates up to 500 kHz and supports 3-phase operation. | Designed for newer ultrabook platforms with tighter voltage tolerances (±0.5%) and faster transient response requirements. | Choose for next-gen designs requiring higher frequency, lower output ripple, and extended VID resolution beyond 5-bit. |
Compared with TPS51220RGER and ISL95831IRZ, LM2633MTD/NOPB uniquely combines VID-programmable core regulation, a dedicated linear regulator channel, and proven 250 kHz interleaved architecture - making it optimal for legacy and cost-sensitive notebook CPU power designs where Ch3 bias rail functionality is essential.
Availability
LM2633MTD/NOPB is available at Aetrix Electronics and suitable for notebook CPU power supplies, information appliance power systems, and general low-voltage DC/DC buck regulator applications requiring stable component supply and long-term production continuity.
Supply support for LM2633MTD/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 connectivity technologies with emphasis on reliability, energy efficiency, and system-level innovation.
The LM2633MTD/NOPB belongs to TI's advanced power management controller product line, engineered specifically for multi-rail, high-efficiency notebook CPU power delivery with dynamic voltage scaling and robust fault protection.
FAQ
What is the primary function of the LM2633MTD/NOPB in a notebook system?
The LM2633MTD/NOPB serves as a triple-output synchronous buck controller managing CPU core voltage (via VID), auxiliary system rail, and linear bias supply. It enables Intel SpeedStep™-compliant voltage scaling, reduces input ripple through 180° phase interleaving, and integrates gate drivers, fault protection, and power-good signaling - all in a single 48-pin TSSOP package.
Does the LM2633MTD/NOPB require external current-sense resistors?
No, the LM2633MTD/NOPB uses VDS-based current sensing on the high-side MOSFETs for both switching channels. Pins ILIM1 and ILIM2 sink a constant 10 µA current, allowing a simple resistor to set the overcurrent threshold by comparing its voltage drop against the MOSFET's drain-to-source voltage - eliminating external sense resistors and associated power loss.
How does the LM2633MTD/NOPB handle soft-start for Channel 1 and Channel 2?
The LM2633MTD/NOPB provides independent analog soft-start for each switching channel using external capacitors on ON/SS1 (Pin 4) and ON/SS2 (Pin 5). The soft-start voltage ramps to VIN (or 6 V, whichever is lower), ensuring controlled output rise times. Critically, this ramp is independent of input voltage slew rate - guaranteeing predictable startup behavior even with slow-rising battery inputs.
What is the role of the VLIN5 pin on the LM2633MTD/NOPB?
The VLIN5 pin (Pin 36) delivers a regulated 5 V output from an internal LDO, rated for up to 25 mA. It powers bootstrap circuits for external high-side MOSFETs when no system 5 V rail is available. When VIN ≥5.5 V, VLIN5 can be tied to VIN to improve light-load efficiency by disabling the LDO - a feature explicitly supported in the LM2633MTD/NOPB datasheet.
Can the LM2633MTD/NOPB operate with input voltages below 5 V?
Yes, the LM2633MTD/NOPB supports a minimum input voltage of 4.5 V when VIN and VLIN5 are tied together - enabling operation from single-cell Li-ion (nominal 3.7 V, max 4.2 V) with boost pre-regulation or from regulated 5 V system rails. Its UVLO threshold is 4.2–4.6 V (rising edge) with 300 mV hysteresis, ensuring clean startup and shutdown behavior.
LM2633MTD/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Controller, Intel Mobile CPU
- Voltage - Input:
- 4.5V ~ 30V
- Number of Outputs:
- 3
- Voltage - Output:
- 0.93V ~ 2V, 1.25V ~ 6V
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TSSOP
LM2633MTD/NOPB FAQ
1.How can I place an order for LM2633MTD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2633MTD/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 LM2633MTD/NOPB reliable?
The price and inventory of LM2633MTD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2633MTD/NOPB is usually 5 days.
3.What payment methods are accepted for LM2633MTD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2633MTD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2633MTD/NOPB?
LM2633MTD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2633MTD/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 LM2633MTD/NOPB?
For technical support, including LM2633MTD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2633MTD/NOPB requirements.
6.How does Aetrix verify that LM2633MTD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2633MTD/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 LM2633MTD/NOPB meets industry standards.
7.What is the process for return or replacement of LM2633MTD/NOPB?
All LM2633MTD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2633MTD/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 LM2633MTD/NOPB part is unused and in its original packaging.
Return procedure for LM2633MTD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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