Infineon Technologies TLE4307D V38

Overview

TLE4307D V38 from Infineon Technologies is a monolithic power charge pump integrated with a very low-drop voltage regulator, delivering a fixed 3.8 V output at up to 800 mA. It features active Zener clamping (VI,cl = 21–25 V), charge-pump off-threshold VC,off = 7.7–8.7 V, and integrated short-circuit and overtemperature protection. Used in industrial DC-powered systems where input supply contains inductive energy (e.g., automotive body control modules).

For engineers reviewing the TLE4307D V38 datasheet, TLE4307D V38 pinout, TLE4307D V38 application, or TLE4307D V38 equivalent, key selection criteria include its dual-stage architecture (charge pump + LDO), total drop voltage of 1.1–1.3 V at 250 mA, slew-rate control via external SL-to-I capacitor, and requirement for ≥22 µF/ESR ≤1 Ω output capacitance.

Technical Context

The TLE4307D V38 integrates two functionally independent stages: a current-limited switching charge pump that charges an external reservoir capacitor (CC) at pin C, and a PNP-based very low-drop regulator stage that supplies regulated 3.8 V from CC to Q. The charge pump uses active clamping and saturation control to limit stress during inductive recirculation.

Regulator stability relies on external CQ (≥22 µF, ESR ≤1 Ω) and internal resistance-balanced reference generation. Protection includes thermal shutdown, current limiting (IQ,max = 0.8–1.6 A), and Zener clamp operation at VI,cl = 21–25 V - enabling robust operation under load dump or inductive kickback conditions.

Key Specifications

Pinout & Package

Package: P-TO252-5-1 / P-TO252-5-11 (5-pin DPAK variant with exposed thermal pad).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-stage regulator applications.

Compared with TLV70738PDBVR and MAX16910ATA+, the TLE4307D V38 uniquely combines charge-pump energy buffering, Zener clamp protection, and 800 mA output in one package-making it optimal for cost-sensitive, inductive-load applications within 0–25 V input range.

Availability

TLE4307D V38 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power rails, smart actuator drivers, and energy-harvesting sensor nodes requiring stable component supply across extended temperature and transient-prone environments.

Supply support for TLE4307D V38 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 high-reliability analog and mixed-signal solutions.

The TLE4307 belongs to Infineon's TLE automotive power system IC family, designed specifically for robust DC-DC conversion in electrically harsh environments-emphasizing transient resilience, thermal safety, and integration of protection functions.

FAQ

What is the minimum input voltage required for stable 3.8 V output?

The TLE4307D V38 requires a minimum input voltage of 0 V to initiate operation, but stable 3.8 V regulation at full load (800 mA) demands VI ≥ 6 V per datasheet Table 4. Below 5 V, the charge pump cannot reach VC,off, causing output collapse. For reliable 250 mA operation, VI ≥ 5.5 V is recommended.

Can the SL pin be left unconnected?

No. Leaving SL floating risks unpredictable slew-rate behavior during inductive recirculation, potentially causing voltage overshoot or oscillation. If slew-rate control is not needed, connect SL directly to pin I (not GND) to disable external capacitor action while maintaining defined bias via internal resistor network (RSL = 60–200 kΩ).

Is the 3.8 V output adjustable?

No. The TLE4307D V38 has a factory-trimmed, non-adjustable 3.8 V output. The "V38" suffix explicitly denotes this fixed voltage variant. For adjustable output, Infineon offers the TLE4307G series with external resistor divider feedback, but those require different pinout and external components.

Does the device require a heatsink in TO252-5 package?

Not typically. With R_thj-c = 4 K/W and max power dissipation of ~1.04 W (at 800 mA × 1.3 V drop), junction temperature rise above case is only ~4.2 °C. Standard 2 oz copper on 1 in² thermal pad suffices for continuous operation at T_a ≤ 85 °C. Heatsinking is only needed in sealed enclosures above 100 °C ambient.