TLF1963TEATMA1 - 1.5A Adj LDO Regulator, 340mV Dropout | Infineon
MPN: TLF1963TEATMA1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.17 | $3.17 |
| 10 | $2.86 | $28.60 |
| 100 | $2.39 | $239.00 |
| 500 | $1.97 | $985.00 |
| 1,000 | $1.72 | $1,720.00 |
TLF1963TEATMA1 Overview
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input-to-output voltage differential is small, in contrast to classical NPN regulators that require at least 2 V headroom. Within the broader taxonomy, LDOs sit below switching regulators (DC-DC converters) in efficiency but excel in noise performance because they do not switch. The TLF1963TEATMA1 belongs to the Infineon linear regulator family -> voltage regulator family -> power management IC category, targeting noise-sensitive and space-constrained loads where a switching converter's EMI would be unacceptable.
Key features include a positive adjustable output from 1.21 V to 19.66 V, 1.5 A continuous output current, 340 mV typical dropout, and integrated protection functions such as current limiting and thermal shutdown. The device is supplied in a TO-252-5 (DPAK) package with an exposed thermal tab that doubles as the main heat-dissipation path and as pin 5 (TAB/GND). The "TE" suffix denotes the TO-252-5 package, while "ATMA1" denotes a 13-inch Tape & Reel packing orientation used in high-volume automotive assembly.
Technically, the regulator uses a PNP pass element architecture that enables low-dropout operation but carries a quiescent current that flows to ground proportional to load. The reference is trimmed to 1.21 V typical, and the output is set by an external resistor divider according to VOUT = 1.21 V x (1 + R1/R2). The output capacitor ESR range is specified in the manufacturer datasheet to maintain loop stability - typically a low-ESR ceramic or tantalum of 22 µF or greater is recommended.
Typical applications include automotive body and chassis ECUs, sensor supplies (5 V rails for Hall/pressure sensors), point-of-load regulation downstream of a 12 V automotive bus, and industrial 24 V to lower-voltage conversion. Designers frequently use the TLF1963 for micro-controller and CAN-transceiver supplies where post-regulation noise is critical. Compared to a switching converter, the TLF1963 trades efficiency for low EMI and simple BOM, making it ideal when the load is below 1.5 A and the input-to-output drop is modest.
When designing with this part, ensure that the maximum power dissipation does not exceed the thermal capability of the DPAK land pattern - copper-pour area on the PCB tab is the primary heatsink. Place input and output capacitors close to the IC and respect the ESR window required by the control loop. Always verify the regulated output voltage spec under worst-case combinations of VIN and IOUT as stated in the manufacturer datasheet.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for TLF1963TEATMA1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TLF1963TEATMA1 (same form factor and footprint) — differing in Package, RoHS Status, Input Voltage Range, Protection Features, Maximum Output Current.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TLF1963TE
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
TLE42744DV33ATMA1
✅ Drop-In✓ In Stock
$0.74 / Unit
View Datasheet →TLE42764DVATMA1
✅ Drop-In✓ In Stock
$0.74 / Unit
View Datasheet →LD1086DT50TR
✅ Drop-In📋 Reference alternative (not in catalog)
LM1086IS-ADJ/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
TLF80511EJV33XUMA1
✅ Drop-In✓ In Stock
$0.65 / Unit
View Datasheet →TLF1963TEATMA1 Maximum Ratings & Electrical Characteristics
| Manufacturer | Infineon Technologies |
| Product Type | Linear Voltage Regulator IC (LDO) |
| Output Configuration | Positive, Adjustable |
| Number of Outputs | 1 |
| Output Voltage Range | 1.21 V to 19.66 V |
| Maximum Output Current | 1.5 A |
| Dropout Voltage (typical) | 340 mV at 1.5 A |
| Reference Voltage | 1.21 V typical |
| Operating Junction Temperature | -40 °C to +150 °C |
| Package | PG-TO252-5-13 (TO-252-5 / DPAK, 4 leads + tab) |
| Mounting Type | Surface Mount |
| Packing | Tape & Reel (13-inch, ATMA1 suffix) |
| Protection Features | Current limit, Thermal Shutdown |
| Automotive Qualified | Yes (Infineon automotive-grade) |
| RoHS Status | Compliant (per distributor listings) |
TLF1963TEATMA1 Pin Configuration
| Pin 1 | IN — Input supply voltage (max 20 V) |
| Pin 2 | OUT — Regulated output voltage |
| Pin 3 | GND — Ground |
| Pin 4 | ADJ — Adjust / feedback pin (sets VOUT via resistor divider) |
| Pin 5 | TAB — Exposed tab - internally connected to GND, also serves as thermal pad |
Typical Applications
TLF1963TEATMA1 is suitable for 6 applications: Automotive Body and Chassis ECU Power, Sensor Supply Rails (5 V / 3.3 V), Point-of-Load (POL) Post-Regulation, Industrial 24 V to 5 V Conversion, Battery-Powered Portable Equipment, After-Market LED Driver Power.
Automotive Body and Chassis ECU Power
The TLF1963TEATMA1 fits automotive 12 V body and chassis ECU supplies because it accepts inputs up to 20 V, survives the -40 °C to +150 °C automotive temperature range, and delivers 1.5 A with only 340 mV dropout - critical during cold-crank when the battery can sag to 6-8 V. Its PNP-pass architecture keeps the loop stable with low-ESR ceramic output capacitors, eliminating the need for noisy switching converters on noise-sensitive sensor rails. Designers use it to derive 5 V from the 12 V battery rail for micro-controllers and CAN transceivers.
Recommended
Sensor Supply Rails (5 V / 3.3 V)
The TLF1963TEATMA1's 1.21 V reference and 1.21-19.66 V adjustable range make it ideal for powering Hall-effect, pressure, and position sensors in industrial and automotive systems. With 340 mV dropout at 1.5 A, it sustains regulation even on cold-cranked battery rails, while the linear topology adds zero switching noise that could couple into high-impedance sensor signal paths. Output is set by a simple resistor divider, and the device needs only a 22 µF low-ESR ceramic on the output for stability.
Recommended
Point-of-Load (POL) Post-Regulation
The TLF1963TEATMA1 is well-suited as a post-regulator after a switching pre-converter on FPGA, DSP, or micro-controller power trees. The 340 mV dropout lets it ride on the 1.0-1.8 V rails with minimal headroom, while its low-noise linear output removes switching ripple that would otherwise degrade ADC SNR and DAC linearity. It can deliver 1.5 A continuously to feed core logic rails, and its exposed-tab DPAK package provides the thermal mass needed to absorb transient load steps.
Recommended
Industrial 24 V to 5 V Conversion
The TLF1963TEATMA1 handles industrial 24 V bus inputs because its 20 V input ceiling permits operation on 24 V ±20 % nominal rails up to ~28 V is the safe max not the spec - more realistically it can be used as a post-regulator from a 24 V pre-regulator. When used as a 24 V to 5 V converter at low currents (<0.4 A), the dissipation of approximately 7.6 W remains within DPAK thermal limits with adequate copper pour. Designers choose the part for its automotive-grade robustness and immunity to industrial EMI events.
Recommended
Battery-Powered Portable Equipment
The TLF1963TEATMA1's 340 mV low-dropout behavior extends battery life in portable equipment by allowing the regulator to stay in regulation even as the battery approaches the output voltage. A 3.6 V Li-ion cell can drive a 3.3 V load at 1.5 A through the TLF1963TEATMA1 with only 0.3 V of headroom, extracting the last few percent of usable energy that a high-dropout regulator would waste. The TO-252-5 package keeps the solution footprint under 100 mm².
Recommended
After-Market LED Driver Power
Linear constant-current LED drivers benefit from the TLF1963TEATMA1's adjustable output and 1.5 A current capability. By replacing the bottom feedback resistor with a sense resistor, the part can be configured as a constant-current source for high-brightness LED strings operating from a 12 V or 24 V supply. The lack of switching noise keeps EMI low - critical for automotive interior lighting and signage that must meet CISPR 25 conducted emissions.
Recommended
Recommended Products Summary
Engineering reference data for TLF1963TEATMA1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLF1963TE | TLE42744DV33ATMA1 | TLE42764DVATMA1 | LD1086DT50TR | LM1086IS-ADJ/NOPB | TLF80511EJV33XUMA1 |
|---|---|---|---|---|---|---|---|
| Brand | Infineon | Infineon | Infineon | Infineon | STMicroelectronics | Texas Instruments | Infineon |
| Package | TO-252-5 (DPAK) | TO-252-5 (DPAK) - same | TO-252-5 (DPAK) - same | TO-252-5 (DPAK) - same | TO-252-5 (DPAK) - same | TO-263-3 (D2PAK) - larger D2PAK variant | TO-252-5 (DPAK) - same |
| Output Type | Adjustable | Adjustable | Fixed 3.3 V | Fixed tracker | Adjustable (or 5 V fixed variant) | Adjustable | Fixed 3.3 V |
| Maximum Output Current | 1.5 A | 1.5 A | 0.4 A | 0.4 A | 1.5 A | 1.5 A | 0.4 A |
| Output Voltage Range | 1.21 V to 19.66 V | 1.21 V to 19.66 V | 3.3 V fixed | Fixed tracker | 1.25 V to ~15 V (adjustable) | 1.25 V to ~15 V (adjustable) | 3.3 V fixed |
| Input Voltage Range | Up to 20 V | Up to 20 V | Up to 45 V | Up to 45 V | Up to 30 V | Up to 30 V | Up to 45 V |
| Automotive Qualified | Yes | Yes | Yes | Yes | Industrial grade | Industrial grade | Yes |
Key Differentiators
- True 340 mV low dropout at 1.5 A - lower than the LD1086/LM1086 family (vs LD1086DT50TR)
- 1.5 A output in DPAK with automotive qualification - higher current than TLE42744 family (vs TLE42744DV33ATMA1)
- Adjustable output from 1.21 V to 19.66 V vs fixed 3.3 V (vs TLF80511EJV33XUMA1)
Design Notes
Estimated: at VIN = 14 V (worst-case automotive load-dump-sustained), VOUT = 5 V, and IOUT = 1.5 A, the TLF1963TEATMA1 must dissipate (14 - 5) × 1.5 = 13.5 W. The DPAK package on a standard JEDEC 1 sq-in. copper pour has θJA ≈ 50 °C/W, yielding a junction temperature rise of about 675 °C above ambient - far exceeding the 150 °C maximum. Designers must either reduce VIN, drop the output to 8 V (dissipation ≈ 9 W, ΔTJ ≈ 450 °C - still excessive), or step down VIN with a switching pre-regulator to keep dissipation under 5 W. In practice, derate to ≤ 0.5 A continuous for true 12 V to 5 V conversion on the DPAK footprint alone.
The exposed tab of the TO-252-5 package must be soldered to the PCB copper pad to meet the thermal specifications. Use a copper-pour area of at least 1 square inch (645 mm²) connected to the tab. The thermal pad should have multiple thermal vias (typically 4-9) under the tab to conduct heat into inner PCB planes. Place input and output capacitors as close as physically possible to the IN and OUT pins to minimize parasitic inductance and ensure loop stability.
Three common mistakes when using the TLF1963TEATMA1: (1) omitting the ADJ resistor divider - the part requires external feedback to set the output, not just capacitors; (2) using high-ESR output capacitors - the control loop requires a minimum 22 µF low-ESR ceramic or tantalum, and ESR above the datasheet limit will cause oscillation; (3) neglecting the input voltage ceiling of 20 V - sustained voltages above 20 V can damage the pass element. Always verify VIN stays within the datasheet absolute maximum rating and that VOUT ≤ VIN - 0.34 V under all load conditions.
Route the ADJ trace away from the noisy IN and OUT traces to prevent noise injection into the feedback loop. Keep the trace from OUT to the top of the resistor divider as short as possible and place R1/R2 close to the ADJ pin. If the layout requires a long ADJ trace, use a small guard ground trace between ADJ and the noisy switching nodes. The ground return of the bottom feedback resistor R2 should tie directly to the GND pin, not to a remote ground point, to prevent ground-loop errors in the regulation setpoint.
Compliance Information
RoHS and REACH compliance per distributor listings. AEC-Q100 qualified per Infineon automotive-grade designation. Halogen-free status not explicitly stated in available data - marked unknown.
