Infineon Technologies 111-4188PBF

Overview

111-4188PBF from Infineon Technologies is a 6 A synchronous buck DC/DC converter with integrated MOSFETs, PMBus/I²C interface, and internal LDO enabling single 16 V input operation. It delivers 0.5 V to 0.875×PV_IN output voltage with ±0.5% reference accuracy, supports up to 1.5 MHz switching frequency, and operates across –40°C to +125°C junction temperature - used in server point-of-load power delivery.

For engineers reviewing the 111-4188PBF datasheet, 111-4188PBF pinout, 111-4188PBF application, or 111-4188PBF equivalent, key selection criteria include its digitally configurable PMBus telemetry (66 commands), true differential remote sensing, thermally compensated overcurrent protection, and dual analog/digital mode operation without firmware dependency.

Technical Context

The IR38060 implements a current-mode PWM controller with integrated high-side (14–27 mΩ) and low-side (6–12 mΩ) MOSFETs, bootstrap diode, and dedicated gate drivers. Its internal LDO powers the control logic from PV_IN, eliminating need for external bias supply when PV_IN ≥ 5.5 V.

It supports both analog configuration (via RT/SYNC resistor, EN/FCCM, ADDR) and full digital control via PMBus - including real-time telemetry of output voltage, current, temperature, and fault status. The dedicated Vsns pin enables OVP and PGood monitoring independent of enable state.

Key Specifications

Pinout & Package

111-4188PBF uses a thermally enhanced 5 mm × 6 mm PQFN package with exposed thermal pad (PGND-connected) and 26-pin layout optimized for high-current, low-inductance PCB routing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck regulator applications.

Compared with MP8765GQ-Z and TPS546B24RVFT, the 111-4188PBF uniquely balances compact 5×6 mm size, integrated LDO, and full PMBus configurability - making it optimal for space-constrained server and telecom POL where both analog fallback and digital telemetry are required.

Availability

111-4188PBF is available at Aetrix Electronics and suitable for server power delivery, telecom baseband regulation, and industrial FPGA core supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 111-4188PBF 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 leader specializing in power management, automotive, and industrial control ICs, with global manufacturing and quality certification to ISO 9001 and IATF 16949.

The IR38060 belongs to Infineon's SupIRBuck™ family - designed specifically for high-efficiency, digitally manageable point-of-load conversion in datacenter and communications infrastructure.

FAQ

What is the minimum input voltage supported by 111-4188PBF in LDO-enabled mode?

The 111-4188PBF supports PV_IN as low as 1.2 V when using an external V_CC supply. With internal LDO enabled, minimum Vin is 5.5 V at 600 kHz switching frequency and 5.5 V at 1.5 MHz - verified per Rev 2.18 Electrical Specifications table. Below 5.5 V, external bias must be supplied to V_CC.

Can 111-4188PBF operate without PMBus communication?

Yes - the device defaults to analog mode when ADDR is floating and SCL/SDA are unconnected. All regulation functions remain active: output voltage is set via FB divider, switching frequency via RT resistor, and OCP via SCL/OCSet pull-up/down. Telemetry (I_OUT, T_J) is available as analog voltages on SDA/IMON and SALERT/TMON pins.

How does the Track_EN pin function in sequencing applications?

Track_EN is an active-low enable for voltage tracking. When pulled low, the device follows the voltage ramp of another regulator connected to VP. For non-tracking use, connect Track_EN to P1V8 via 100 kΩ - this disables tracking and configures the pin as a high-impedance input. Leaving it floating may cause undefined behavior per Pin Descriptions section.

What thermal performance can be expected in a standard 4-layer PCB layout?

With recommended 5×6 mm PQFN layout - including 1-in² copper pour connected to exposed thermal pad and 4×22 µF input capacitors near PVIN/PGND - θ_J-A is 30°C/W. Measured junction rise is ≤25°C above ambient at 6 A, 12 V_IN, 0.6 V_OUT, and 600 kHz, per Thermal Information table and typical application curve in Rev 2.18.