TLF42772ELXUMA2 - 300mA 40V LDO w/ Current Monitor | Infineon
MPN: TLF42772ELXUMA2 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $2.98 | $29.80 |
| 100 | $2.41 | $241.00 |
| 500 | $1.95 | $975.00 |
| 1,000 | $1.62 | $1,620.00 |
| 2,500 | $1.35 | $3,375.00 |
TLF42772ELXUMA2 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 differential is small. LDOs sit within the broader linear regulator hierarchy, which itself belongs to the power management IC family and ultimately to power semiconductor components. The LDO's defining characteristic is that, unlike a switching regulator, it dissipates excess voltage as heat but adds no switching noise to the output - making it the preferred topology for noise-sensitive analog and RF rails.
Key features of the TLF42772ELXUMA2 include a 40 V maximum input rating (well suited for direct connection to automotive 12 V or 24 V buses with load-dump transients), an integrated current-monitor output that mirrors the load current for diagnostics, and built-in protection for overvoltage, overtemperature, and overcurrent conditions. The adjustable output is set by an external resistor divider, and the device includes a reset/wake function for ECU sleep/wake coordination.
The device uses a bipolar pass element architecture to achieve the 40 V input tolerance required by 12 V automotive systems. The integrated current monitor is implemented as an analog mirror sourced through a dedicated pin, eliminating the need for an external shunt resistor in antenna-fault-diagnostic applications and reducing BOM cost and PCB area. Compared with discrete regulator-plus-shunt designs, the TLF42772ELXUMA2 cuts component count while meeting AEC-Q100 automotive stress-test standards.
Typical applications include active-antenna power supply in car infotainment head units, GPS/SDARS antenna modules, telematics control units (TCUs), and body-domain controllers requiring a clean 5 V to 12 V rail from a noisy 12 V battery feed. It also suits industrial sensor conditioning and any 12 V/24 V industrial bus that needs a regulated low-current rail with load monitoring.
When designing with this part, place input/output ceramic capacitors close to the IC pins and ensure the exposed pad is soldered to a sufficient copper pour for thermal dissipation. The current-monitor pin output must be scaled with an external resistor to match the host ADC's input range, and the reset delay capacitor value should be chosen to satisfy the downstream microcontroller's power-good timing requirement.
This page synthesizes distributor pricing, drop-in alternatives from the Infineon OPTIREG family and compatible cross-brand parts, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for TLF42772ELXUMA2 — 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 TLF42772ELXUMA2 (same form factor and footprint) — differing in Maximum Output Current, Package, Input Voltage Range, Output Voltage Accuracy, Protection Features.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TLF42772ELXUMA1
✅ Drop-In📋 Reference alternative (not in catalog)
TLF42772LDXUMA1
✅ Drop-In📋 Reference alternative (not in catalog)
TLE42744GSV33HTMA1
✅ Drop-In✓ In Stock
$0.89 / Unit
View Datasheet →TLE4252DATMA1
✅ Drop-In✓ In Stock
$1.65 / Unit
View Datasheet →TLE42644GHTMA1
✅ Drop-In✓ In Stock
$0.71 / Unit
View Datasheet →TLF42772ELXUMA2 Maximum Ratings & Electrical Characteristics
| Manufacturer | Infineon Technologies |
| Part Family | OPTIREG Linear (TLF4277-2EL) |
| Regulator Type | LDO (Low-Dropout) Linear Regulator |
| Output Configuration | Positive Adjustable |
| Number of Outputs | 1 |
| Output Voltage Range | 5 V to 12 V (adjustable via external resistor divider) |
| Maximum Output Current | 300 mA |
| Input Voltage Range | Up to 40 V |
| Current Monitor | Integrated analog current-monitor output |
| Protection Features | Overvoltage, Overtemperature, Overcurrent |
| Operating Temperature Range | -40 C to +150 C (junction) |
| Package | PG-SSOP-14-EP (14-pin SSOP with exposed thermal pad) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Automotive Qualification | AEC-Q100 (per Infineon OPTIREG automotive family) |
TLF42772ELXUMA2 Pin Configuration
| Pin 1 | IN — Input voltage (up to 40 V) |
| Pin 2 | IN — Input voltage (tie to pin 1) |
| Pin 3 | EN — Enable input (active high) |
| Pin 4 | ADJ — Adjust / feedback for output voltage setting |
| Pin 5 | GND — Ground |
| Pin 6 | IMON — Current monitor output (analog mirror) |
| Pin 7 | RESET — Reset output (active low, open-drain) |
| Pin 8 | D — Delay timing capacitor for reset |
| Pin 9 | NC — Not connected (per datasheet) |
| Pin 10 | NC — Not connected (per datasheet) |
| Pin 11 | OUT — Regulated output voltage (5 V to 12 V) |
| Pin 12 | OUT — Regulated output voltage (tie to pin 11) |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | NC — Not connected (per datasheet) |
Typical Applications
TLF42772ELXUMA2 is suitable for 7 applications: Automotive Active-Antenna Power Supply, Telematics Control Unit (TCU) Power Rail, Industrial 24V Sensor Conditioning, Body-Domain Controller Auxiliary Rail, GPS/GNSS Receiver Power Supply, SDARS / Satellite Radio Antenna Module, Electric Vehicle Battery-Management Auxiliary Rail.
Automotive Active-Antenna Power Supply
The TLF42772ELXUMA2 is purpose-built by Infineon to supply active antenna modules in car infotainment head units. Its 40 V maximum input rating absorbs 12 V automotive load-dump transients without external TVS clamping, while the adjustable 5 V to 12 V output covers FM/AM, DAB, GPS, and SDARS antenna rails. The integrated analog current monitor enables antenna-cable fault detection (open/short) by mirroring load current to the head-unit ADC - replacing a discrete regulator-plus-shunt design and shrinking the BOM. AEC-Q100 qualification and -40 C to +150 C junction rating make it drop-in ready for under-dash and head-unit deployment.
Recommended
Telematics Control Unit (TCU) Power Rail
Telematics control units require a clean, monitored 5 V or 8 V rail to supply GNSS receivers, cellular modems, and backup-battery charging circuits from a 12 V automotive battery. The TLF42772ELXUMA2's 300 mA output is sufficient for the GNSS LNA, modem sleep rail, and accelerometer, while the integrated current monitor provides a real-time load-current feedback to the TCU MCU for sleep-current profiling. The 40 V input tolerance eliminates the need for an upstream preregulator, reducing board area and BOM cost in space-constrained TCU enclosures.
Recommended
Industrial 24V Sensor Conditioning
Industrial 24 V sensor-conditioning modules require a regulated 5 V or 12 V rail for analog front-ends, op-amps, and 4-20 mA loop transmitters. The TLF42772ELXUMA2 accepts the 24 V industrial bus directly and delivers a clean adjustable output up to 300 mA, supporting multiple sensor channels. The integrated current-monitor output enables per-rail load monitoring for predictive maintenance, while the overvoltage/overtemperature/overcurrent protection set meets IEC 61131-2 industrial control immunity requirements. The PG-SSOP-14-EP footprint allows standard SMT assembly lines.
Recommended
Body-Domain Controller Auxiliary Rail
Automotive body-domain controllers consolidate lighting, door-module, and seat-control functions and need multiple low-current rails to supply peripheral MCUs and sensor clusters. The TLF42772ELXUMA2 provides one such rail from the 12 V battery with 40 V load-dump tolerance, while its integrated current monitor feeds back into the BCM's ADC for per-rail fault detection. The exposed-pad PG-SSOP-14-EP package handles continuous dissipation at full 300 mA output across the -40 C to +125 C ambient automotive grade without requiring a heatsink.
Recommended
GPS/GNSS Receiver Power Supply
GPS/GNSS receiver modules require an ultra-clean low-noise 3.3 V or 5 V rail to drive the LNA, SAW filter, and GNSS IC, where any supply ripple directly multiplies into position-jitter artifacts. While the TLF42772ELXUMA2's adjustable 5 V to 12 V output is higher than the typical GNSS rail voltage, it can be paired with a downstream low-noise post-regulator (such as the Infineon TLS805B1SJV) to deliver a clean 3.3 V GNSS supply from a 12 V automotive battery. The 40 V input tolerance and current monitor simplify the upstream protection and diagnostics design.
Recommended
SDARS / Satellite Radio Antenna Module
SDARS (Satellite Digital Audio Radio Service) antenna modules require a tightly regulated 5 V to 8 V supply to power the LNA and downconverter, with strict noise requirements to preserve receiver sensitivity. The TLF42772ELXUMA2's LDO topology eliminates the switching ripple that would otherwise desensitize the SDARS front-end, while its 40 V input tolerance handles the harsh automotive battery environment. The integrated current monitor allows the head unit to detect antenna-cable degradation in real time, supporting OTA diagnostics and warranty analytics.
Recommended
Electric Vehicle Battery-Management Auxiliary Rail
In 12 V auxiliary domains of electric vehicles (xEV), the TLF42772ELXUMA2 can supply the battery management system's secondary rails - cell-balancing controllers, isolated CAN transceivers, and the BMS MCU - directly from the 12 V battery. Its 40 V input tolerance covers jump-start and load-dump events on the 12 V rail, and its integrated current monitor provides an additional layer of load-profiling data to the BMS host. The AEC-Q100 qualification and -40 C to +150 C junction rating meet the under-hood thermal envelope of EV battery packs.
Recommended
Recommended Products Summary
Engineering reference data for TLF42772ELXUMA2 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLF42772ELXUMA1 | TLF42772LDXUMA1 | TLE42744GSV33HTMA1 | TLE4252DATMA1 | TLE42644GHTMA1 |
|---|---|---|---|---|---|---|
| Brand | Infineon | Infineon | Infineon | Infineon | Infineon | Infineon |
| Package | PG-SSOP-14-EP | PG-SSOP-14-EP | PG-SSOP-14-EP | PG-SSOP-14-EP | PG-SSOP-14-EP | PG-SSOP-14-EP |
| Output Voltage Range | 5 V to 12 V (adjustable) | 5 V to 12 V (adjustable) | 5 V to 12 V (adjustable) | 3.3 V (fixed) | 5 V (typical) | 5 V (fixed) |
| Maximum Output Current | 300 mA | 300 mA | 300 mA | 300 mA | 300 mA | 300 mA |
| Maximum Input Voltage | 40 V | 40 V | 40 V | 40 V | 40 V | 40 V |
| Integrated Current Monitor | Yes | Yes | Yes | No | No | No |
| Automotive Grade (AEC-Q100) | Yes | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature Range | -40 C to +150 C (junction) | -40 C to +150 C | -40 C to +150 C | -40 C to +150 C | -40 C to +150 C | -40 C to +150 C |
Key Differentiators
- Integrated analog current monitor eliminates external shunt resistor (vs TLE42744GSV33HTMA1)
- Adjustable 5 V to 12 V output covers full automotive antenna voltage range (vs TLE42644GHTMA1 (fixed 5 V))
- Same-die drop-in compatibility across ELXUMA1 and ELXUMA2 reel variants (vs TLF42772ELXUMA1)
Design Notes
Estimated: At VIN = 14 V (worst-case 12 V battery with load dump transient), VOUT = 5 V, IOUT = 300 mA, the LDO dissipates approximately (14 - 5) * 0.3 = 2.7 W. The PG-SSOP-14-EP's exposed thermal pad must be soldered to at least 1 square inch of copper pour (preferably 2 oz copper on both top and bottom layers with thermal vias) to keep the junction-to-ambient thermal resistance within the datasheet's rated limit and avoid thermal shutdown at +125 C ambient. Without the exposed pad soldered properly, thermal shutdown may engage well before 300 mA output.
Place the input capacitor (1 uF X7R minimum, 10 uF recommended for load-dump transients) directly at the IN pins, and the output capacitor (1 uF X7R minimum, ESR < 200 mOhm) within 5 mm of the OUT pins. The exposed pad must be tied to GND with a star connection back to the input capacitor ground to avoid ground-loop noise coupling into the ADJ/feedback path. Keep the IMON trace short and routed away from switching nodes to preserve monitor accuracy.
Do not float the ADJ pin - it must be tied to a resistor divider between OUT and GND, with the divider impedance kept between 10 kOhm and 100 kOhm to balance quiescent-current draw against noise pickup. The IMON output is an analog current source - do NOT connect it directly to an ADC input without an external scaling resistor, or the ADC input voltage will exceed its rails. The reset delay capacitor value on the D pin sets the power-good delay and must be sized per the downstream MCU's reset timing requirement.
Compliance Information
AEC-Q100 qualified per Infineon OPTIREG automotive family datasheet. RoHS and REACH compliant per distributor listings (DigiKey 5355464, Mouser). Halogen-free status not explicitly stated in the retrieved data.
