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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Management - Specialized

Texas Instruments LM3460M5X-1.2

Name: LM3460M5X-1.2
Brand: Texas Instruments
SKU: LM3460M5X-1.2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM3460M5X-1.2

Manufacturer:: Texas Instruments

Category:: Power Management - Specialized

Package:: SC-74A, SOT-753

Datasheet:: LM3460M5X-1.2.pdf

Description:: IC CONTROLLER PRECISION SOT23-5

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Product details

Overview

LM3460M5X-1.2 from Texas Instruments is a precision shunt regulator IC designed for GTL and GTLplus bus termination control, delivering 1.22 V ±1% regulated output at 1 mA load, with 3.3 mA/mV transconductance and 50 µV_rms output noise (10 Hz–10 kHz), used in high-current linear regulator feedback loops driving external NPN pass transistors up to 7 A.

For engineers reviewing the LM3460M5X-1.2 datasheet, LM3460M5X-1.2 pinout, LM3460M5X-1.2 application, or LM3460M5X-1.2 equivalent, key selection considerations include its SOT23-5 package, internal 12.5 kΩ feedback resistor (min 7.5 kΩ), 0.95 V max output saturation voltage, 85 µA typical quiescent current, and compatibility with 1.2 V/7 A GTL termination designs requiring fast transient response and low temperature coefficient.

Technical Context

The LM3460M5X-1.2 implements a precision bandgap reference with curvature correction, driving an internal op amp error amplifier whose output sources current to control external NPN pass transistors via negative feedback. Its IN pin senses regulated voltage between IN and GND, while the OUT pin sources current when IN reaches V_REG = 1.22 V.

Compensation is applied externally via the COMPENSATION pin (Pin 3), typically using a capacitor to OUT; stability verification requires observing output transient response under 0–7 A load steps, where recovery time is ≤30 µs with <5 mV deviation. The device operates only within 0°C to +70°C ambient and requires external heatsinking for the pass transistor due to dropout-dependent power dissipation.

Key Specifications

Parameter	Value and Actual Design Meaning
Regulated Voltage	1.220 V (typ), ±1% tolerance at 1 mA - ensures tight 1.2 V GTL bus voltage compliance
Transconductance	3.3 mA/mV - enables rapid current sourcing to cut off pass transistor base drive during transients
Output Noise	50 µV_rms (10 Hz–10 kHz) - minimizes voltage perturbation in sensitive bus termination
Quiescent Current	85 µA (typ) - reduces standby power in always-on termination circuits
Internal Feedback Resistor	12.5 kΩ (max), 7.5 kΩ (min) - sets default 1.2 V output; adjustable via external divider per Figure 7
Saturation Voltage	0.95 V (max) - defines minimum headroom needed across device to maintain regulation
Thermal Resistance θ_JA	330 °C/W - determines required PCB copper area and thermal relief for safe 300 mW operation

Pinout & Package

LM3460M5X-1.2 is housed in a 5-lead SOT23-5 package (Package Number MF05A), with Pin 1 (IN) sensing regulated voltage, Pin 2 (GND) as reference node, Pin 3 (COMPENSATION) for loop stability tuning, Pin 4 (OUT) sourcing control current, and Pin 5 (NC) internally unconnected but soldered to PCB for thermal conduction.

Pin/Terminal	Circuit Role	Design Meaning
1 (IN)	Voltage sense input	Connected to GTL bus node; regulates when voltage reaches 1.22 V relative to GND
2 (GND)	Reference ground	Return path for all internal references and feedback; must be low-impedance
3 (COMPENSATION)	Error amplifier compensation node	Accepts external capacitor to OUT for phase margin control; critical for 30 µs transient recovery
4 (OUT)	Current source output	Sources up to 20 mA to turn on Q1 and disable pass transistor base drive in Figure 5
5 (NC)	No internal connection	Thermally tied to die substrate; must be soldered to PCB copper for heat transfer

Key Features

Feature	Design Value
Precision 1.22 V output	±1% tolerance over temperature ensures GTL bus voltage stays within JEDEC-compliant 1.2 V ±30 mV window
Fast transient response	≤30 µs recovery from 0–7 A load step supports high-speed GTL/GTLp signaling without bus collapse
Integrated bandgap reference	Curvature-corrected design achieves low temperature coefficient, maintaining regulation across 0°C–70°C
Adjustable output capability	External resistor divider (RA < 500 Ω) allows custom regulation voltages beyond 1.2 V or 1.5 V standard options
Tiny SOT23-5 footprint	Minimizes PCB area in space-constrained motherboard or backplane termination layouts

Applications

GTL Bus Termination	GTLplus Bus Termination
Use Scenario: Termination of parallel GTL buses in Intel Pentium II/III-era chipsets and server memory controllers operating at 1.2 V. IC Role / Device Role / Timing Role: Precision shunt regulator controlling external NPN pass transistor to maintain stable 1.2 V termination voltage under dynamic switching loads. Use Value: Enables <0.1 mV load regulation error and <5 mV transient deviation-critical for signal integrity on multi-drop GTL buses.	Use Scenario: High-speed GTLp bus termination in workstation graphics subsystems and high-bandwidth I/O bridges requiring 1.2 V @ 7 A. IC Role / Device Role / Timing Role: Feedback controller sourcing current to gate driver circuitry (Q1/D1/R7 network in Figure 5) for precise 1.2 V regulation with minimal headroom. Use Value: Supports 30 µs transient recovery and <0.1 mV line regulation-meeting GTLp timing skew and noise margin requirements.
Adjustable Linear Regulator Controller	High-Current Bus Power Management
Use Scenario: Custom low-voltage linear regulator design for ASIC core supplies or FPGA I/O banks needing 1.0–1.8 V with >5 A output. IC Role / Device Role / Timing Role: Precision voltage reference and error amplifier enabling user-defined output via external resistive divider (RA/RB). Use Value: Eliminates need for discrete reference + op amp; 1% accuracy and 50 µV_rms noise preserve analog-sensitive supply performance.	Use Scenario: Dynamic bus power control in telecom line cards where GTL termination must scale with link activity. IC Role / Device Role / Timing Role: Shunt regulator enabling fast ON/OFF control of pass transistor via OUT pin current sourcing-supports burst-mode power management. Use Value: 85 µA quiescent current and 0.95 V saturation voltage minimize idle losses while preserving fast enable/disable timing.

GTL Bus Termination

GTLplus Bus Termination

Use Scenario: Termination of parallel GTL buses in Intel Pentium II/III-era chipsets and server memory controllers operating at 1.2 V.

IC Role / Device Role / Timing Role: Precision shunt regulator controlling external NPN pass transistor to maintain stable 1.2 V termination voltage under dynamic switching loads.

Use Value: Enables <0.1 mV load regulation error and <5 mV transient deviation-critical for signal integrity on multi-drop GTL buses.

Use Scenario: High-speed GTLp bus termination in workstation graphics subsystems and high-bandwidth I/O bridges requiring 1.2 V @ 7 A.

IC Role / Device Role / Timing Role: Feedback controller sourcing current to gate driver circuitry (Q1/D1/R7 network in Figure 5) for precise 1.2 V regulation with minimal headroom.

Use Value: Supports 30 µs transient recovery and <0.1 mV line regulation-meeting GTLp timing skew and noise margin requirements.

Adjustable Linear Regulator Controller

High-Current Bus Power Management

Use Scenario: Custom low-voltage linear regulator design for ASIC core supplies or FPGA I/O banks needing 1.0–1.8 V with >5 A output.

IC Role / Device Role / Timing Role: Precision voltage reference and error amplifier enabling user-defined output via external resistive divider (RA/RB).

Use Value: Eliminates need for discrete reference + op amp; 1% accuracy and 50 µV_rms noise preserve analog-sensitive supply performance.

Use Scenario: Dynamic bus power control in telecom line cards where GTL termination must scale with link activity.

IC Role / Device Role / Timing Role: Shunt regulator enabling fast ON/OFF control of pass transistor via OUT pin current sourcing-supports burst-mode power management.

Use Value: 85 µA quiescent current and 0.95 V saturation voltage minimize idle losses while preserving fast enable/disable timing.

Equivalent & Alternatives

The following parts are listed as comparable options for similar shunt regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM3460M5X-1.5	Fixed 1.5 V output (vs. 1.22 V); internal RF = 8.9 kΩ (max) vs. 12.5 kΩ	Designed for GTLp 1.5 V systems; not interchangeable without circuit redesign	Select only if system requires 1.5 V bus voltage and compatible pass transistor biasing
TLV431ACDBVR	Adjustable 1.24 V reference (±0.5%); 80 µA IQ; no dedicated COMPENSATION pin	Lacks integrated compensation node and GTL-optimized transient response; requires external op amp for high-current control	Use for general-purpose adjustable shunt regulation where 30 µs transient recovery is not required

Compared with LM3460M5X-1.2, the LM3460M5X-1.5 offers higher fixed output for GTLp but cannot replace it in 1.2 V designs, while TLV431ACDBVR provides tighter voltage tolerance and adjustability but lacks the dedicated compensation pin and proven 7 A GTL transient performance-making LM3460M5X-1.2 uniquely suited for legacy GTL/GTLp termination.

Availability

LM3460M5X-1.2 is available at Aetrix Electronics and suitable for GTL bus termination, GTLplus bus termination, and adjustable high-current linear regulator applications requiring stable component supply for industrial embedded upgrades and legacy system maintenance.

Supply support for LM3460M5X-1.2 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The LM3460 product line was developed specifically for precision GTL and GTLplus bus termination control, integrating bandgap reference, error amplifier, and output stage in SOT23-5 to enable compact, high-stability 1.2 V/1.5 V linear regulator designs.

FAQ

What is the primary function of the LM3460M5X-1.2 in a GTL bus system?

The LM3460M5X-1.2 serves as a precision shunt regulator that controls an external high-current NPN pass transistor to maintain a stable 1.22 V termination voltage on GTL buses. It senses voltage at its IN pin, sources current from its OUT pin when regulation is exceeded, and thereby modulates the pass transistor's base drive to enforce tight voltage control-even under fast 0–7 A load transients. This function is explicitly defined in the SNVS126D datasheet for LM3460M5X-1.2.

Can the LM3460M5X-1.2 be used for voltages other than 1.2 V?

Yes, the LM3460M5X-1.2 supports adjustable output voltages beyond its nominal 1.22 V using an external resistive divider connected to the IN and OUT pins, as shown in Figure 7 of the SNVS126D datasheet. RA must be less than 500 Ω and use 1% tolerance resistors to maintain accuracy; increasing RA introduces deviation due to internal resistor interaction. This adjustability is confirmed in the "SETTING THE OUTPUT VOLTAGE" section for LM3460M5X-1.2.

What is the role of Pin 5 (NC) on the LM3460M5X-1.2, and must it be connected?

Pin 5 on the LM3460M5X-1.2 has no internal electrical connection but is thermally tied to the die substrate and must be soldered to the PCB for optimal heat transfer. The SNVS126D datasheet explicitly states this requirement under "CONNECTION DIAGRAM AND PACKAGE INFORMATION" to prevent thermal overload, especially given the device's 300 mW power dissipation limit and 330 °C/W θ_JA. Leaving Pin 5 unconnected risks exceeding the 150°C junction temperature limit during sustained operation.

How does the LM3460M5X-1.2 achieve fast transient response in 1.2 V/7 A applications?

The LM3460M5X-1.2 achieves ≤30 µs transient recovery by combining high transconductance (3.3 mA/mV) with a wide-bandwidth feedback loop and external compensation via the dedicated COMPENSATION pin (Pin 3). In the 1.2 V/7 A reference design (Figure 5), this enables rapid sourcing of current from the OUT pin to activate Q1's drive circuit-cutting off the Darlington pass transistor before bus voltage droops more than 5 mV. These performance metrics are measured and documented in the "PERFORMANCE DATA" section of the LM3460M5X-1.2 datasheet.

Is the LM3460M5X-1.2 still in active production, and what is its lifecycle status?

The LM3460M5X-1.2 is marked "OBSOLETE" in the official Texas Instruments SNVS126D datasheet (Revision D, April 2013), indicating it is no longer in active production. However, Aetrix Electronics maintains legacy supply chain access for continued support of installed base systems, including traceable sourcing and BOM continuity management-ensuring availability for industrial embedded upgrades and maintenance of legacy GTL/GTLp infrastructure where redesign is impractical.

LM3460M5X-1.2 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: SC-74A, SOT-753

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Applications:: GTA, GTA+

Current - Supply:: 85µA

Voltage - Supply:: 3V ~ 3.6V

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-5

LM3460M5X-1.2 FAQ

1.How can I place an order for LM3460M5X-1.2 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM3460M5X-1.2 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 LM3460M5X-1.2 reliable?

The price and inventory of LM3460M5X-1.2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3460M5X-1.2 is usually 5 days.

3.What payment methods are accepted for LM3460M5X-1.2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3460M5X-1.2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM3460M5X-1.2?

LM3460M5X-1.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM3460M5X-1.2 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 LM3460M5X-1.2?

For technical support, including LM3460M5X-1.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3460M5X-1.2 requirements.

6.How does Aetrix verify that LM3460M5X-1.2 is sourced from the original manufacturer or authorized distributors?

All LM3460M5X-1.2 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 LM3460M5X-1.2 meets industry standards.

7.What is the process for return or replacement of LM3460M5X-1.2?

All LM3460M5X-1.2 units undergo pre-shipment inspection (PSI). If there is an issue with LM3460M5X-1.2, 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 LM3460M5X-1.2 part is unused and in its original packaging.

Return procedure for LM3460M5X-1.2:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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