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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Infineon Technologies TLE4268G

Name: TLE4268G
Brand: Infineon Technologies
SKU: TLE4268G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TLE4268G

Manufacturer:: Infineon Technologies

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: TLE4268G.pdf

Description:: IC REG LINEAR 5V 180MA DSO20

Quantity:: RFQ Add To RFQ list

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Inventory:1,262

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Product details

Overview

TLE4268G from Infineon Technologies is a 5-V low-drop fixed-voltage regulator with integrated watchdog, reset generator, overtemperature and reverse-polarity protection, delivering ≥180 mA output current at ≤0.5 V drop (IQ = 150 mA), ±2% output voltage tolerance, and AEC-Q100 qualification for automotive power supply rails.

For engineers reviewing the TLE4268G datasheet, TLE4268G pinout, TLE4268G application, or TLE4268G equivalent, this device supports critical 5-V microcontroller supply regulation with programmable reset threshold (4.2–4.8 V), adjustable reset delay (10–25 ms), watchdog activation above 8 mA load, and operation across −40 °C to +150 °C junction temperature.

Technical Context

The TLE4268G implements a bandgap-referenced control amplifier driving a series pass transistor with saturation control to maintain low dropout under load. Its reset generator monitors scaled output voltage at RADJ; when input falls below 1.35 V (typ.), it discharges an external capacitor on D pin until lower timing threshold (0.4 V typ.) triggers open-collector RO low.

Watchdog logic activates only above 8 mA load current and responds to rising edges on W pin; missing pulses within 55 ms (typ., CD = 100 nF) force RO low. Protection circuits include thermal shutdown (>150 °C), reverse-polarity blocking, and short-circuit current limiting.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	5.00 V ±2% (4.90–5.10 V); stable regulation across 6–28 V input and 5–150 mA load.
Drop Voltage	0.25–0.50 V at 150 mA; enables operation with VI as low as 5.5 V while sustaining 5 V output.
Reset Threshold	4.2–4.8 V (adjustable via RADJ pin); default 4.5 V when RADJ grounded; ensures reliable MCU brown-out detection.
Reset Delay Time	10–25 ms (CD = 100 nF); externally set via capacitor on D pin for configurable reset hold duration.
Watchdog Period	30–75 ms (CD = 100 nF); defines maximum allowed pulse interval before RO asserts reset.
Junction Temp Range	−40 °C to +150 °C; qualified per AEC-Q100 Grade 0; supports under-hood automotive environments.
Quiescent Current	13–20 mA at 150 mA load; ultra-low 300–450 μA at zero load; minimizes standby power loss.

Pinout & Package

Available in PG-DSO-20 package (20-pin, exposed thermal pad, RoHS-compliant).

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 8, 13, 19, 20	N.C.	No internal connection; must remain unconnected per datasheet.
3	RO	Open-collector reset output; pulled up to VQ (5 V) via 30 kΩ internal resistor; sinks reset signal when triggered.
4–7, 14–17	GND	Multiple ground terminals; reduce impedance and improve thermal dissipation in high-current automotive PCB layouts.
9	D	Reset delay capacitor node; connects external capacitor to GND to set reset pulse width (10–25 ms typical).
10	RADJ	Reset threshold adjustment input; voltage divider to GND sets VRT from 4.2–4.8 V; grounded → 4.5 V trigger.
11	W	Positive-edge-triggered watchdog input; requires ≥25 ms pulse interval (CD = 100 nF); activates only above 8 mA load.
12	Q	Regulated 5 V output; requires 22 μF ceramic capacitor (ESR < 3 Ω) directly at pin for stability.
18	I	Input voltage terminal; accepts 5.5–45 V; requires local ceramic decoupling capacitor directly at pin.

Key Features

Feature	Design Value
Integrated Watchdog	Edge-triggered monitoring with 55 ms (typ.) timeout; disabled below 8 mA load to prevent false resets during MCU sleep.
Adjustable Reset Threshold	Voltage-divider programmable from 4.2–4.8 V via RADJ pin; eliminates need for external comparator circuitry.
Low-Drop Operation	0.25 V (typ.) dropout at 150 mA enables use with marginal battery voltages (e.g., cold-crank 6 V).
AEC-Q100 Qualified	Grade 0 (−40 °C to +150 °C); validated for automotive powertrain, body control, and ADAS ECU applications.
Reverse Polarity Protection	Internal blocking prevents damage from accidental battery reversal; no external diode required.

Applications

Engine Control Unit (ECU)

Body Control Module (BCM)

Use Scenario: Regulating 5 V supply for 32-bit microcontroller and CAN transceiver in gasoline/diesel engine management systems.

IC Role / Device Role / Timing Role: Primary 5 V LDO with watchdog supervision and brown-out reset generation for fault-tolerant startup and runtime monitoring.

Use Value: Ensures deterministic MCU reset during battery voltage sag (e.g., cranking to 6 V) while maintaining <0.5 V dropout and AEC-Q100 reliability.

Use Scenario: Powering door module microcontrollers, LIN transceivers, and window motor drivers in vehicle body electronics.

IC Role / Device Role / Timing Role: System power supervisor providing regulated 5 V, programmable reset threshold, and watchdog-triggered fail-safe behavior.

Use Value: Enables robust sleep-mode operation (watchdog inactive <8 mA) and precise brown-out detection (4.5 V default) without external components.

Advanced Driver Assistance Systems (ADAS)

Infotainment Head Unit

Use Scenario: Supplying vision processor and radar sensor interface ICs requiring clean, monitored 5 V rail in front-camera or parking-assist modules.

IC Role / Device Role / Timing Role: Safety-critical voltage regulator with thermal shutdown, reverse-polarity immunity, and reset signaling for ASIL-B subsystems.

Use Value: Guarantees safe power-down under overtemperature (>150 °C) and maintains functional safety via open-collector RO tied to processor reset input.

Use Scenario: Delivering stable 5 V to audio DSP, display controller, and USB PHY in center-stack infotainment systems.

IC Role / Device Role / Timing Role: High-reliability LDO with adjustable reset delay (via D pin capacitor) to coordinate multi-rail power sequencing.

Use Value: Allows precise 15 ms (typ.) reset hold time to ensure proper initialization of downstream peripherals before release.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 5-V automotive LDO with watchdog and reset functions.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV70750PDBVR	Lower IQ (25 μA), no watchdog or reset; 300 mA output; SOT-23-5 package.	Lacks system supervision features; suitable only for non-safety-critical, low-power auxiliary rails.	Select only if watchdog/reset functionality is handled externally and thermal/automotive qualification is not required.
MAX16126ATP+T	3.3 V fixed output; includes power-good flag but no watchdog; 200 mA; TQFN-20 package.	Not pin-compatible; requires redesign for 5 V requirement and lacks edge-triggered watchdog monitoring.	Consider only for 3.3 V systems needing high-accuracy reset (±0.5%) without watchdog dependency.

Compared with TLV70750PDBVR and MAX16126ATP+T, the TLE4268G uniquely integrates watchdog, adjustable reset, and AEC-Q100 Grade 0 qualification in a single PG-DSO-20 package-enabling simplified, safety-aware 5 V supply design without external supervision ICs.

Availability

TLE4268G is available at Aetrix Electronics and suitable for Engine Control Units, Body Control Modules, Advanced Driver Assistance Systems, and Infotainment Head Units requiring stable component supply across automotive production lifecycles.

Supply support for TLE4268G 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs, with leadership in AEC-Q100-qualified analog and mixed-signal solutions.

The TLE4268G belongs to Infineon's TLE family of automotive-grade linear voltage regulators, designed specifically for robust, supervised 5 V power delivery in engine, chassis, and safety-critical electronic control units.

FAQ

What is the minimum input voltage required for regulation?

The TLE4268G begins regulating at VI ≥ 5.5 V, with guaranteed 5.0 V ±2% output across 6–28 V input range. Below 5.5 V, dropout increases rapidly; operation below 5.5 V is not specified and may result in unregulated output or reset assertion.

How is the watchdog function enabled or disabled?

The watchdog activates automatically when load current exceeds 8 mA (typical); it deactivates below that threshold to avoid spurious resets during MCU sleep. No external enable/disable signal is required-the function is load-dependent and fully integrated.

Can the reset threshold be set below 4.2 V?

No. The internal reference limits RADJ-based reset threshold to 4.2–4.8 V. Connecting RADJ directly to GND yields 4.5 V (typical); applying a voltage divider that scales VQ below 1.28 V violates the absolute maximum rating (VRADJ ≥ −0.3 V) and risks malfunction.

Is thermal pad soldering required for PG-DSO-20?

Yes. The exposed thermal pad on the PG-DSO-20 package must be soldered to a large copper pour on the PCB to achieve Rthj-a = 100 K/W and sustain full 150 °C junction temperature. Omitting pad connection reduces thermal performance and risks premature thermal shutdown.

TLE4268G Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: OPTIREG™

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 45V

Voltage - Output (Min/Fixed):: 5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.5V @ 150mA

Current - Output:: 180mA

Current - Quiescent (Iq):: 450 µA

Current - Supply (Max):: 20 mA

PSRR:: -

Control Features:: Reset, Watchdog

Protection Features:: Over Current, Over Temperature, Reverse Polarity, Short Circuit

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: PG-DSO-20-35

TLE4268G FAQ

1.How can I place an order for TLE4268G through Aetrix?

Please submit a Request for Quotation (RFQ) for TLE4268G 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 TLE4268G reliable?

The price and inventory of TLE4268G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLE4268G is usually 5 days.

3.What payment methods are accepted for TLE4268G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLE4268G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TLE4268G?

TLE4268G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TLE4268G 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 TLE4268G?

For technical support, including TLE4268G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLE4268G requirements.

6.How does Aetrix verify that TLE4268G is sourced from the original manufacturer or authorized distributors?

All TLE4268G 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 TLE4268G meets industry standards.

7.What is the process for return or replacement of TLE4268G?

All TLE4268G units undergo pre-shipment inspection (PSI). If there is an issue with TLE4268G, 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 TLE4268G part is unused and in its original packaging.

Return procedure for TLE4268G:

1.Submit a request within 90 days.

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

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