Counterfeit and defect prevention
Visual and packaging inspection
Electrical performance verification
Service Email:
[email protected]
>
TPS78628KTTT
Texas Instruments
IC REG LINEAR 2.8V 1.5A DDPAK
2174 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Fixed 1 Output 1.5A TO-263 (DDPAK-5)
Request Quote
(Ships tomorrow)
*Quantity
Minimum 1
Minimum 1
5.0 / 5.0
- (273 Ratings)
TPS78628KTTT
Product Overview
1837730
DiGi Electronics Part Number
TPS78628KTTT-DGManufacturer
Texas Instruments
TPS78628KTTT
Description
IC REG LINEAR 2.8V 1.5A DDPAKInventory
2174 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Fixed 1 Output 1.5A TO-263 (DDPAK-5)
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
Warranty & Returns
How to Order
Shipping & Delivery
Quality Assurance
365 - Day Quality Guarantee - Every part fully backed.
90 - Day Refund or Exchange - Defective parts? No hassle.
Limited Stock, Order Now - Get reliable parts without worry.
Global Shipping & Secure Packaging
Worldwide Delivery in 3-5 Business Days
100% ESD Anti-Static Packaging
Real-Time Tracking for Every Order
Secure & Flexible Payment
Credit Card, VISA, MasterCard, PayPal, Western Union, Telegraphic Transfer(T/T) and more
All payments encrypted for security
TPS78628KTTT Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - Linear, Low Drop Out (LDO) Regulators
Packaging
Tape & Reel (TR)
Series
-
Product Status
Active
Output Configuration
Positive
Output Type
Fixed
Number of Regulators
1
Voltage - Input (Max)
5.5V
Voltage - Output (Min/Fixed)
2.8V
Voltage - Output (Max)
-
Voltage Dropout (Max)
0.58V @ 1.5A
Current - Output
1.5A
Current - Quiescent (Iq)
385 µA
PSRR
59dB ~ 32dB (100Hz ~ 100kHz)
Control Features
Enable
Protection Features
Over Current, Over Temperature, Reverse Polarity, Under Voltage Lockout (UVLO)
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
Supplier Device Package
TO-263 (DDPAK-5)
Base Product Number
TPS78628
Datasheet & Documents
HTML Datasheet
TPS78628KTTT-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
2 (1 Year)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
TEXTISTPS78628KTTT
2156-TPS78628KTTT
296-14424-6-NDR
-296-14424-1-DG
TPS78628KTTTG3-DG
-296-14424-1
296-14424-1-NDR
296-14424-2
296-14424-1
TPS78628KTTTG3
296-14424-6
296-14424-2-NDR
-TPS78628KTTTG3
-TPS78628KTTT-NDR
-TPS78628KTTTG3-NDR
-296-14424-1-NDR
Standard Package
50
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
DiGi Electronics的商品非常有一致性，買了好幾次都沒失望，價格也很實惠。
de desembre 02, 2025
The professionalism you encounter with their staff makes every purchase experience seamless and enjoyable.
de desembre 02, 2025
Their shipping speed is unparalleled, ensuring I get what I need exactly when I need it.
de desembre 02, 2025
Great value, and the website's simplicity helps me get everything done efficiently.
Publish Evalution
Evalution Message
Please enter your review message.
Please post honest comments and do not post ilegal comments.
Frequently Asked Questions (FAQ)
What are the key thermal design considerations when using the TPS78628KTTT in a high-ambient-temperature environment, and how can I prevent thermal shutdown during continuous operation?
The TPS78628KTTT has an internal thermal shutdown mechanism that activates at approximately 165°C, but sustained operation at high junction temperatures can degrade reliability. At maximum load (1.5A) and typical dropout voltage (0.58V), power dissipation reaches ~0.87W. In a TO-263 (DDPAK-5) package with thermal resistance θJA ~40°C/W (dependent on PCB layout), this can result in a temperature rise of ~35°C above ambient. To ensure robust operation in environments up to 125°C, use a generously sized copper pad (at least 1 in² on external layers), multiple thermal vias, and minimize trace length to ground to enhance heat dissipation. Consider derating current capacity if adequate copper area is not feasible. Simulating worst-case junction temperature using TJ = TA + (PD × θJA) is recommended to avoid intermittent faults due to thermal cycling.
How does the TPS78628KTTT compare to the TPS7A4700 in terms of noise rejection and suitability for powering low-noise analog circuits like precision ADCs?
While both regulators are low-noise capable, the TPS78628KTTT offers moderate PSRR (59dB at 100Hz, dropping to 32dB at 100kHz), making it suitable for general mixed-signal applications. However, the TPS7A4700 provides significantly better PSRR (up to 78dB at 100Hz and maintained above 50dB into 100kHz) and lower output noise (4µVRMS vs. ~30µVRMS estimated for TPS78628KTTT based on similar LDO architectures), making it superior for ultra-low-noise precision ADCs or RF circuits. If your design uses sensitive analog front-ends and you require high signal integrity, the TPS7A4700 is a better fit. The TPS78628KTTT remains a strong choice for cost-sensitive or moderately noise-sensitive applications where simplicity and 1.5A output current are prioritized.
Can the TPS78628KTTT safely replace the LM1085-2.8 in an existing design, and what critical differences should I verify before redesign or drop-in substitution?
The TPS78628KTTT can functionally replace the LM1085-2.8 as both provide a fixed 2.8V output, but key differences must be evaluated. The TPS78628KTTT has a lower max input voltage (5.5V vs. LM1085’s 30V), so if your circuit operates above 5.5V, this substitution will fail—ensure input is within safe limits. Additionally, the TPS78628KTTT includes an enable pin for power sequencing, unlike the LM1085, which may require pull-up resistors or grounding the EN pin for basic operation. Thermal performance also differs: the TPS78628KTTT’s DDPAK-5 package typically outperforms the LM1085’s TO-220 in surface-mount layouts but requires proper PCB thermal vias. Verify operating margin, enable control logic, and dropout performance (0.58V @ 1.5A) to ensure stable regulation under load.
What PCB layout best practices should I follow to maintain stability and prevent oscillations when integrating the TPS78628KTTT in a densely populated power plane?
The TPS78628KTTT is internally compensated and stable with small ceramic output capacitors (minimum 10µF), but improper layout can introduce parasitic inductance and instability. To mitigate risk, place a 10µF–22µF X5R ceramic capacitor as close as possible to the OUT pin with short, wide traces to minimize loop area. Ensure a solid ground plane and avoid splitting ground under the device. Route the IN capacitor (also ≥10µF) similarly to dampen input transients. Use the tab of the TO-263 (DDPAK-5) package as the primary thermal and electrical ground connection—connect it directly to a large internal ground plane via multiple thermal vias. Avoid long traces from enable or feedback nodes (though fixed-output relieves feedback concerns), and consider shielding sensitive control lines from switching noise sources to maintain enable signal integrity.
How does the dropout voltage of the TPS78628KTTT impact battery-powered applications, and is it suitable for use with a single-cell Li-ion battery?
The TPS78628KTTT has a maximum dropout voltage of 0.58V at 1.5A, meaning it requires the input voltage to remain above 3.38V (2.8V + 0.58V) for regulated output. A single-cell Li-ion battery discharges from 4.2V (fully charged) down to ~3.0V (cutoff), so during the final 30% of discharge, input voltage will fall below the required headroom, causing the output to droop and regulation to be lost. Therefore, the TPS78628KTTT is not ideal for direct regulation from a single Li-ion cell across full discharge. For extended runtime, consider a low-quiescent buck-boost converter or a low-dropout (LDO) like the TPS7A3301 (negative output) or a buck converter stage. Alternatively, use the TPS78628KTTT only when the battery is above 3.4V and pair it with a battery gauge or supervisor circuit to predict end-of-life gracefully.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
TPS78628KTTT CAD Models
Texas Instruments TPS78628KTTT PCB symbols & footprints
productDetail
