Infineon Technologies 21-0066PBF

Overview

21-0066PBF from International Rectifier (now Infineon) is a dual-output, 2-phase synchronous buck power block integrating power MOSFETs, PWM controller, gate drivers, and passive components in a single compact module. It delivers up to 15A per output (30A total in single-output mode), supports 3.14–5.5V input and 0.8–3.3V programmable output, operates at 200–400kHz per phase with 180° phase shift, and includes independent soft-start, overvoltage/overcurrent/overtemperature protection - used in high-density server VRMs and telecom POL converters.

For engineers reviewing the 21-0066PBF datasheet, 21-0066PBF pinout, 21-0066PBF application, or 21-0066PBF equivalent, key selection criteria include dual-phase current capability, external synchronization support, hiccup vs latch overcurrent response, thermal derating behavior at 125°C block temperature, and layout-insensitive integrated passives for rapid deployment in space-constrained 12V-input systems.

Technical Context

The 21-0066PBF implements a two-phase interleaved synchronous buck architecture with internal current-mode PWM control, dual error amplifiers, and independent feedback loops per channel. Each phase integrates high- and low-side MOSFETs with matched R_DS(on), driver logic, and bootstrap circuitry - enabling precise 180° phase offset and reduced input/output ripple without external timing components.

It features an internal oscillator with RT-programmable frequency (200–400kHz), external SYNC input for master-slave operation, and dedicated HICCUP pin to select between hiccup-mode or latch-off overcurrent response. Protection includes VOUT overvoltage shutdown at 1.15×VREF, PGOOD monitoring with ±10% trip threshold, and thermal shutdown at 140°C.

Key Specifications

Pinout & Package

21-0066Pbf is housed in a thermally enhanced QFN-style power block package measuring 15.5mm × 9.25mm × 2.6mm with exposed thermal pad. Pin assignment is verified per IRF PD-97109 datasheet Rev. A (2006).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output synchronous buck power block applications.

Compared with MP87651 and TPS53689, the 21-0066PBF uniquely combines dual independent outputs, integrated power stage, and per-channel soft-start in a single compact module - making it optimal for space-constrained, multi-rail applications where BOM reduction and layout simplicity are prioritized over ultimate scalability or ultra-low profile.

Availability

21-0066PBF is available at Aetrix Electronics and suitable for server memory VRMs, telecom point-of-load converters, and industrial PLC CPU core supplies requiring stable component supply, long-lifecycle availability, and consistent thermal performance across -40°C to +125°C operating range.

Supply support for 21-0066PBF 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

International Rectifier (acquired by Infineon Technologies in 2015) specialized in high-performance power semiconductors and integrated power solutions for computing, telecom, and industrial markets.

The iP1201 family - including 21-0066PBF - was designed specifically for high-current, low-voltage DC-DC conversion in space-constrained server and networking equipment, emphasizing integration density, thermal robustness, and simplified layout over raw efficiency optimization.

FAQ

What is the maximum allowable PCB temperature for continuous 15A per channel operation?

At 15A per channel and 300kHz switching frequency, the 21-0066PBF maintains safe operation up to 125°C block temperature (T_BLK) with 1.8µH inductors and no forced airflow. Derating begins above 110°C PCB temperature per Figure 3 in the datasheet - full 15A is guaranteed only when T_PCB ≤ 90°C under natural convection conditions.

Can the 21-0066PBF operate with a 3.3V input supply?

Yes - the device supports input voltages from 3.14V to 5.5V. At 3.3V input, the maximum output voltage is limited to 2.5V (per datasheet Table 1), and output current capability reduces to 11.5A per channel at T_PCB = 90°C due to reduced duty cycle headroom and higher conduction losses.

How does the HICCUP pin affect overcurrent protection behavior?

When the HICCUP pin is pulled high, overcurrent events trigger hiccup mode: the device shuts down for ~20ms, then attempts restart. If fault persists, it repeats. When pulled low, overcurrent causes immediate latch-off - requiring ENABLE toggle or power cycle to recover. This selection is fixed at power-up and cannot be changed dynamically.

Is external compensation required for stable loop operation?

No - the 21-0066PBF includes fully compensated internal error amplifiers optimized for standard 1.8µH output inductors and 1000µF ceramic output capacitance. External compensation is unnecessary unless using non-standard LC values; the CC1/CC2 pins are reserved for factory calibration and must remain unconnected in standard designs.