Infineon Technologies TLE4307D V33

Overview

TLE4307D V33 from Infineon Technologies is a monolithic power charge pump + very low-drop linear regulator IC delivering 3.3 V at up to 800 mA output current. It integrates a switching charge pump (pin C) and a PNP-based LDO stage (pin Q), with active Zener clamping, short-circuit protection, overtemperature shutdown, and slew-rate control via external capacitor on pin SL. Used in 12 V automotive and industrial DC supply systems where input ripple or inductive source stress must be mitigated.

For engineers reviewing the TLE4307D V33 datasheet, TLE4307D V33 pinout, TLE4307D V33 application, or TLE4307D V33 equivalent, key selection criteria include its dual-stage architecture (charge pump + LDO), 3.3 V ±3% output tolerance at 250 mA, 1.1 V total drop (VI–VQ) at 250 mA, thermal shutdown at 150 °C junction, and P-TO252-5-11 package with exposed thermal pad.

Technical Context

The TLE4307D V33 implements a two-stage regulation architecture: first, a current-limited charge pump switches to charge an external reservoir capacitor (CC) at pin C until VC reaches 7.7–8.7 V (VC,off), then a PNP-series very-low-drop regulator supplies regulated 3.3 V from CC to pin Q. The charge pump includes active Zener clamping (VI,cl = 21–25 V) and saturation control to prevent power device oversaturation.

Regulation relies on a precision reference and resistive voltage divider feedback driving a buffered PNP base. Load-dependent saturation control maintains stable operation across 0–800 mA, while stability requires CQ ≥ 22 µF with ESR ≤ 1 Ω. Slew-rate limiting is implemented externally via capacitor between SL and I pins.

Key Specifications

Pinout & Package

P-TO252-5-11 package with exposed thermal pad (pin 3 = GND, thermally connected to die substrate). Five-terminal surface-mount outline optimized for high-current thermal dissipation in industrial and automotive PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV71333PDRVR and MAX16910ATA+T, the TLE4307D V33 uniquely combines charge-pump energy buffering, 25 V Zener clamping, and 800 mA LDO output in one P-TO252-5-11 package-enabling simplified, robust power delivery from harsh 12 V sources without external protection or staging.

Availability

TLE4307D V33 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, smart lighting driver subsystems, and medical sensor interfaces requiring stable component supply under extended temperature and transient stress.

Supply support for TLE4307D V33 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 ICs, and industrial control solutions, with global manufacturing and qualification standards for AEC-Q100 and industrial reliability.

The TLE4307 belongs to Infineon's TLE automotive power system IC family, designed specifically for robust, integrated power conditioning in 12 V vehicle networks and industrial equipment with inductive loads and supply transients.

FAQ

What is the purpose of the SL pin on the TLE4307D V33?

The SL (Slewrate Control) pin accepts an external capacitor connected to the I pin to limit the rate of voltage change during charge pump recirculation. This reduces electromagnetic interference generated by fast switching edges, especially when driven from inductive sources like relay coils or motor drivers. Its internal resistance is 60–200 kΩ, allowing precise dV/dt tuning without additional active components.

Can the TLE4307D V33 operate directly from a 5 V input?

No. The TLE4307D V33 requires a minimum input voltage of approximately 6.5 V to ensure reliable charge pump operation-its VC,off threshold starts at 7.7 V, and the pump must reach that level to enable the LDO stage. At 5 V input, the charge pump cannot charge CC sufficiently, resulting in no regulated output at pin Q. It is designed for nominal 12 V systems with cold-crank down to ~6 V.

Is an external capacitor required on pin C, and what value is recommended?

Yes, an external reservoir capacitor (CC) is mandatory on pin C. Infineon specifies 470 µF/15 V in the reference design. This capacitor stores energy delivered by the charge pump and supplies the LDO stage. Using less than 470 µF risks output droop under dynamic load, while exceeding it offers diminishing returns and increases board area and cost without improving regulation performance.

How does the TLE4307D V33 handle overtemperature conditions?

The TLE4307D V33 features integrated overtemperature protection that disables both the charge pump and LDO stages when junction temperature exceeds 150 °C. Operation resumes automatically once the die cools below the hysteresis threshold (~140 °C). This shutdown is independent of load current and input voltage, and is verified across the full -40 °C to +150 °C operating range per AEC-Q100 stress testing protocols.