3PEAK TPL510Q and TPL5051Q Automotive LDOs: Low Dropout, Low Noise, and Fast Transient Response for Secondary Power Rails
Automotive controllers often need several low-voltage rails for processors, sensors, and analog circuitry. Selecting a regulator involves more than meeting the current requirement: load changes, power consumption, thermal conditions, and available board space must be considered together.
The 3PEAK TPL510Q and TPL5051Q are AEC-Q100-qualified LDO regulators for automotive secondary supplies. They deliver 1 A and 500 mA, respectively, support a 1.7–6.5 V input range, and offer package options as small as 2 × 2 mm DFN. They can be evaluated downstream of a front-end converter to provide regulated low-voltage power.
Figure 1. Package options. Select the package and output configuration using the complete ordering code.
Core Specifications
| Parameter | TPL510Q | TPL5051Q |
|---|---|---|
| Product type | Automotive LDO regulator | Automotive LDO regulator |
| Maximum output current | 1 A | 500 mA |
| Input voltage range | 1.7–6.5 V | 1.7–6.5 V |
| Output accuracy | ±1%, under specified conditions | ±1%, under specified conditions |
| Automotive qualification | AEC-Q100 | AEC-Q100 |
Plan Voltage Headroom and Dissipation Together
An LDO needs sufficient input-to-output headroom to maintain regulation. Lower dropout allows the preceding supply to be set closer to the required output, potentially reducing dissipation. The design should still allow for input tolerance, PCB voltage drop, temperature, and load changes.
Manufacturer testing reports a maximum dropout of 240 mV for TPL510Q at 1 A across temperature. Use the relevant operating conditions when applying this result to the intended power rail.
Figure 2. Dropout characteristics. Evaluate current and temperature conditions together.
Check the Rail During Load Changes
Steady-state accuracy does not describe the complete response when a processor, sensor, or peripheral changes operating state. Validation should measure both voltage deviation and recovery during increasing and decreasing load.
The published TPL510Q load-step result shows approximately ±40 mV output variation. Repeating an equivalent test on the final board helps establish the influence of capacitance, routing, and load-edge timing.
Figure 3. Load-transient test: VIN = VOUT(NOM) + 0.5 V, VOUT = 3.3 V, CIN = 1 μF, COUT = 1 μF, IOUT = 10–1000 mA. The result applies to these test conditions.
Evaluate Noise in the Complete Supply Chain
Noise-sensitive loads need an assessment that goes beyond nominal voltage. These low-noise LDOs can be considered for ADCs, clock circuitry, and SoC analog rails.
Use a defined measurement bandwidth and check the intended output and capacitor configuration. When a switching converter supplies the LDO, evaluate regulator-generated noise and rejection of upstream ripple separately, then measure the completed power rail.
Figure 4. Noise test results. Use consistent measurement bandwidth and operating conditions for comparisons.
Include Regulator Consumption in the Standby Budget
Regulator consumption matters in continuously powered modules. The published quiescent-current figure is 25 μA, with full-temperature test results below 27 μA.
Quiescent current is only one part of the system budget. Include downstream loads and other always-on circuits, then combine measured current with the time spent in each operating state. This provides a useful comparison of alternative supply arrangements.
Figure 5. Quiescent-current characteristics. This parameter excludes external load current.
Compare Electrical Performance and Device Robustness
Assess accuracy, dropout, line and load response, noise, quiescent current, and package cooling against the requirements of the receiving circuit. A balanced comparison is more useful than selecting by one headline figure.
Published device-level ESD ratings are 4 kV HBM and 1.5 kV CDM. Equipment-level interfaces and protection still require validation for the intended operating environment.
Figure 6. Performance comparison. Interpret each result with its original conditions and comparison criteria.
Build a Coordinated Automotive Power Platform
Target applications include infotainment, body control, ADAS, and automotive sensors. Allocate regulators according to each rail's current, noise sensitivity, dynamic behavior, and thermal requirements.
For a multi-rail platform, document input sources, required outputs, startup sequencing, and load limits before selecting devices. Use the product roadmap for planning, then confirm the complete ordering code, availability, and applicable specification revision.
Figure 7. Automotive LDO roadmap for platform-level component selection.
Contact AENEAS Electronics
Contact AENEAS Electronics Co., Ltd. for 3PEAK TPL510Q and TPL5051Q product information, sample inquiries, and application evaluation for automotive control and sensing power supplies.
Product specifications, typical characteristics, and operating conditions are subject to the latest manufacturer documentation.