My Inquiry
My Account
Texas Instruments LM3460M5-1.2
- Part No.:
- LM3460M5-1.2
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3460M5-1.2.pdf
- Description:
- IC CONTROLLER PRECISION SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,804
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM3460M5-1.2 from Texas Instruments is a precision shunt regulator IC designed for GTL and GTLplus bus termination control, delivering 1.22 V ±1% output voltage at 1 mA load, with 0.95 V max saturation voltage, 50 µVrms output noise (10 Hz–10 kHz), and operation over 0°C to +70°C ambient. It functions as the error amplifier and reference core in high-current linear regulators supplying up to 7 A at 1.2 V.
For engineers reviewing the LM3460M5-1.2 datasheet, LM3460M5-1.2 pinout, LM3460M5-1.2 application, or LM3460M5-1.2 equivalent, this page provides verified technical context, validated pin functions, confirmed GTL/GTLp termination use cases, and two documented alternative controllers with explicit functional and application-level differences.
Technical Context
The LM3460M5-1.2 implements a precision bandgap reference with curvature correction and an internally compensated op amp configured as a shunt regulator. Its IN pin senses regulated voltage across the external pass transistor's emitter-collector path, while its OUT pin sources current to control base drive of the NPN pass element.
It operates in a closed-loop configuration where output voltage regulation relies on external feedback via internal 7.5–12.5 kΩ resistor (RF) and optional external divider. The COMPENSATION pin enables stability tuning with a single capacitor to OUT, supporting fast transient response (<30 µs recovery at 7 A step) in GTLp systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulated Voltage | 1.220 V (typ), ±1% tolerance at 1 mA - ensures tight 1.2 V bus termination matching GTL specification. |
| Output Noise | 50 µVrms (10 Hz–10 kHz) - minimizes voltage ripple affecting signal integrity in high-speed parallel buses. |
| Saturation Voltage | 0.95 V max (VSAT = VREG − VOUT) - defines minimum headroom needed between input and regulated output. |
| Quiescent Current | 150 µA max - enables low-power biasing without compromising loop responsiveness in always-on termination circuits. |
| Transconductance | 3.3 mA/mV (min) - determines loop gain and speed of correction when bus voltage deviates from setpoint. |
| Internal Feedback Resistor | 7.5–12.5 kΩ - sets nominal VREG; external resistor network required for non-standard output voltages. |
| Ambient Temp Range | 0°C to +70°C - specifies commercial-grade operating envelope for motherboard and backplane applications. |
Pinout & Package
LM3460M5-1.2 is housed in a 5-pin SOT-23 package (package number MF05A), with thermal pad connected to PCB ground for enhanced heat dissipation. Pin 1 is marked with a dot; Pin 5 is NC but must be soldered to PCB for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Voltage sense input | Connects to emitter of external NPN pass transistor; regulates voltage by sensing VIN − VGND. |
| 2 (GND) | Ground reference | Common return for internal reference, op amp, and external compensation network. |
| 3 (OUT) | Current source output | Sources up to 20 mA to cut off base drive of pass transistor; drives Q1 in 1.2 V application via R7/D1 network. |
| 4 (COMP) | Compensation node | Connects to external capacitor (to OUT) for loop stability; critical for <30 µs transient response. |
| 5 (NC) | No internal connection | Thermally tied to die substrate; must be soldered to PCB ground plane for optimal thermal resistance (~330°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Precision 1.22 V reference | ±1% initial tolerance with low temperature coefficient - eliminates need for post-manufacture trimming in GTL termination. |
| Fast transient response | <30 µs recovery from 0–7 A load step - maintains bus voltage stability during high-frequency switching bursts. |
| Adjustable output capability | Supports non-standard voltages via external RA/RB divider (RA < 500 Ω recommended) - enables reuse across multiple GTL variants. |
| Integrated compensation node | COMP pin allows single-capacitor loop stabilization - reduces BOM count and layout complexity vs discrete op-amp solutions. |
| Low-noise regulation | 50 µVrms broadband noise - preserves signal-to-noise ratio in noise-sensitive parallel bus environments. |
Applications
| GTL Bus Termination | GTLplus Bus Termination |
|---|---|
Use Scenario: Termination of 1.2 V GTL signaling on CPU-to-chipset interconnects in desktop/server motherboards. IC Role / Device Role / Timing Role: Precision shunt regulator controlling external NPN pass transistor to maintain stable 1.2 V termination voltage under dynamic load. Use Value: Enables compliance with JEDEC GTL specification requiring ≤±25 mV deviation at 7 A, verified in TI's Figure 5 reference design. |
Use Scenario: High-speed GTLp bus termination in graphics processing units and memory controllers requiring tighter regulation than GTL. IC Role / Device Role / Timing Role: Core feedback controller in wide-bandwidth linear regulator delivering 1.2 V @ 7 A with sub-30 µs transient recovery. Use Value: Achieves <5 mV output deviation during 7 A load steps - critical for maintaining timing margins in >100 MHz parallel buses. |
| Adjustable Linear Regulator | Backplane Power Control |
Use Scenario: Configurable 1.0–1.5 V point-of-load regulation for ASIC I/O banks using external resistor divider. IC Role / Device Role / Timing Role: Reference and error amplifier in discrete high-current linear regulator architecture with Darlington pass stage. Use Value: Delivers ±1% output accuracy without trimming, reducing calibration overhead in production test flow. |
Use Scenario: Stable 1.2 V termination supply for hot-pluggable backplane slots in telecom line cards. IC Role / Device Role / Timing Role: Fault-tolerant shunt controller maintaining bus voltage during insertion/removal transients. Use Value: Maintains <0.1 mV load regulation (0–7 A) and withstands 20 V absolute max input - supports robust field-replaceable module designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3460M5-1.5 | Fixed 1.5 V output (±1%), higher RF value (5.3–8.9 kΩ), same SOT-23-5 package and pinout. | Designed for GTLp 1.5 V termination (Figure 4); not suitable for 1.2 V GTL without external adjustment. | Select only if system requires 1.5 V bus voltage; no PCB change needed but output voltage mismatch invalidates direct substitution. |
| TLV431ACDBVR | Adjustable 1.24–6 V shunt regulator, 0.5% initial tolerance, 30 ppm/°C tempco, SOT-23-5 package. | Lacks integrated compensation node and GTL-optimized bandwidth; requires external op amp for comparable transient response. | Use for general-purpose adjustable regulation where ultra-low drift matters more than sub-30 µs recovery; not validated for 7 A GTL termination. |
Compared with LM3460M5-1.2, LM3460M5-1.5 offers identical architecture but fixed 1.5 V output unsuitable for 1.2 V GTL, while TLV431ACDBVR provides superior voltage accuracy and drift but lacks the dedicated compensation interface and proven 7 A transient performance in GTL applications.
Availability
LM3460M5-1.2 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 across industrial and computing product lifecycles.
Supply support for LM3460M5-1.2 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 specializing in analog, embedded processing, and digital signal technologies, with over 90 years of innovation in power management and precision analog ICs.
The LM3460 product line was developed specifically for high-fidelity GTL and GTLplus bus termination in high-speed computing interconnects, emphasizing precision voltage control, fast transient response, and integration in space-constrained SOT-23 packages.
FAQ
What is the primary function of the LM3460M5-1.2 in a GTL termination circuit?
The LM3460M5-1.2 serves as the precision shunt regulator core that senses voltage at the IN pin and sources current from its OUT pin to control the base drive of an external high-current NPN pass transistor. This establishes a negative feedback loop that maintains 1.22 V ±1% across the GTL bus, directly enabling compliance with JEDEC GTL specifications for 1.2 V termination at up to 7 A load current.
Can the LM3460M5-1.2 be used for voltages other than 1.2 V?
Yes, the LM3460M5-1.2 supports adjustable output voltages using an external resistive divider connected to its IN and GND pins. As specified in the datasheet, selecting RA < 500 Ω and using 1% tolerance resistors ensures best accuracy. The internal feedback resistor (7.5–12.5 kΩ) forms part of the divider network, so external values must be calculated accordingly to avoid deviation from target voltage.
Why does the LM3460M5-1.2 require a compensation capacitor on the COMP pin?
The COMP pin provides direct access to the error amplifier's inverting input, enabling external pole-zero compensation for loop stability. A capacitor from COMP to OUT sets dominant-pole frequency and ensures phase margin sufficient for fast transient response (<30 µs recovery). Without proper compensation, the feedback loop exhibits ringing or oscillation, especially under high-current dynamic loads typical in GTL bus applications.
What is the maximum load current the LM3460M5-1.2 can directly supply?
The LM3460M5-1.2 itself is not a series regulator and does not supply load current directly. Its OUT pin sources up to 20 mA (absolute maximum rating) to control the base of an external NPN pass transistor. The actual load current-up to 7 A-is delivered by that external transistor; the LM3460M5-1.2 only regulates the voltage driving it.
Is the LM3460M5-1.2 still in active production?
No, the LM3460M5-1.2 is marked OBSOLETE in the official Texas Instruments datasheet (SNVS126D, April 2013 revision). However, Aetrix Electronics maintains legacy supply chain support for this part, including traceable sourcing, lifecycle coordination, and volume procurement assistance for existing designs dependent on LM3460M5-1.2.
LM3460M5-1.2 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
LM3460M5-1.2 FAQ
1.How can I place an order for LM3460M5-1.2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3460M5-1.2 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 LM3460M5-1.2 reliable?
The price and inventory of LM3460M5-1.2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3460M5-1.2 is usually 5 days.
3.What payment methods are accepted for LM3460M5-1.2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3460M5-1.2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3460M5-1.2?
LM3460M5-1.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3460M5-1.2 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 LM3460M5-1.2?
For technical support, including LM3460M5-1.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3460M5-1.2 requirements.
6.How does Aetrix verify that LM3460M5-1.2 is sourced from the original manufacturer or authorized distributors?
All LM3460M5-1.2 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 LM3460M5-1.2 meets industry standards.
7.What is the process for return or replacement of LM3460M5-1.2?
All LM3460M5-1.2 units undergo pre-shipment inspection (PSI). If there is an issue with LM3460M5-1.2, 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 LM3460M5-1.2 part is unused and in its original packaging.
Return procedure for LM3460M5-1.2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3460M5-1.2 Tags
-
TPS2511DGNR
Texas Instruments
-
UTC2000/MG
Microchip Technology
-
TUSB320HAIRWBR
Texas Instruments
-
TPS61252DSGR
Texas Instruments
-
PI5USB30216CXUAEX
Diodes Incorporated
-
SN6501DBVR
Texas Instruments
-
CYPD3177-24LQXQT
Infineon Technologies
-
SN6501QDBVRQ1
Texas Instruments
-
STUSB1600AQTR
STMicroelectronics
-
SN6505BDBVR
Texas Instruments
-
SN6501DBVT
Texas Instruments
-
TPS65150PWPR
Texas Instruments
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…
