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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Infineon Technologies 111-3053PBF

Name: 111-3053PBF
Brand: Infineon Technologies
SKU: 111-3053PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 111-3053PBF

Manufacturer:: Infineon Technologies

Category:: DC DC Switching Controllers

Package:: 14-SOIC (0.154", 3.90mm Width)

Datasheet:: 111-3053PBF.pdf

Description:: IC REG CTRLR BUCK 14SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

IR3651SPBF from Infineon Technologies is a high-voltage synchronous PWM buck controller designed for non-isolated DC/DC conversion in 36–75V input telecom and industrial systems. It drives external N-MOSFETs with 1A source/sink capability per driver, supports programmable switching frequency up to 400kHz, and regulates output voltage via a precision 1.25V internal reference. Used in 48V point-of-load regulators with hiccup-mode overcurrent protection.

For engineers reviewing the IR3651SPBF datasheet, IR3651SPBF pinout, IR3651SPBF application, or IR3651SPBF equivalent, key selection criteria include high-side/high-side driver timing (30–100ns dead time), MOSFET R_DS(on)-based current sensing via OCset pin, UVLO thresholds on Vcc/DRVcc/Vb (4.17V/9V/9V start), and SOIC-14 thermal resistance (Θ_JA = 88.2°C/W).

Technical Context

The IR3651SPBF implements a voltage-mode PWM control architecture with an internal 1.25V reference and transconductance error amplifier (g_m = 1.5–3.0 m℧). Its oscillator frequency is set by an external resistor on Rt pin and can be synchronized externally via SYNC pin at up to 480kHz.

It integrates high- and low-side gate drivers with independent supply rails (Vb for high-side, DRVcc for low-side), each featuring 1A pulsed drive strength, matched rise/fall times (10–20ns), and programmable hiccup-mode OCP using MOSFET R_DS(on) sensing on OCset pin.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	12V to 100V bus input - supports wide-range 48V telecom and industrial DC distribution.
Switching Frequency	100–400kHz, adjustable via Rt resistor - enables optimization of efficiency vs. size for inductor/capacitor selection.
Reference Voltage	1.25V ±1.5% (0°C–125°C) - enables accurate output regulation down to sub-1V with external resistor divider.
Driver Output Current	1A source/sink per driver (Hi/Lo) - directly drives large gate charges without external buffers in most 48V PoL designs.
UVLO Thresholds	Vcc: 4.17V (start), DRVcc/Vb: 9.0V (start) - ensures stable startup under brownout conditions in multi-rail systems.
Dead Time	30–100ns - prevents shoot-through in synchronous buck while maintaining high duty-cycle capability (up to 80%).
OCP Method	Hiccup mode via OCset pin with MOSFET R_DS(on) sensing - eliminates need for sense resistors and reduces BOM cost.

Pinout & Package

Package: 14-pin SOIC NB (S), body dimension 8.65mm × 3.9mm, Θ_JA = 88.2°C/W, Θ_JC = 37°C/W.

Pin/Terminal	Circuit Role	Design Meaning
1 Fb	Inverting feedback input	Connects to output voltage divider; sets regulated Vout = 1.25V × (1 + R1/R2).
2 Comp	Error amplifier output	External RC network here stabilizes loop; typical compensation uses 2.2nF + 10kΩ to ground.
3 SS/SD	Soft-start / shutdown control	Capacitor to ground sets ramp time; <0.3V forces shutdown - enables sequencing and fault recovery.
4 SYNC	External clock synchronization input	Accepts TTL/CMOS clock up to 480kHz - simplifies EMI filtering in multi-converter systems.
5 PGnd	Power ground return	Separate low-impedance path for driver currents - isolates noise from signal ground (Pin 13).
6 LDrv	Low-side MOSFET gate driver output	Drives N-channel MOSFET source to PGnd; 1A peak current supports Qg ≤ 20nC at 400kHz.
7 DRVcc	Low-side driver bias supply	Must be ≥10V; decoupled with ≥0.1µF ceramic to PGnd - powers LDrv independently of Vcc.
8 Vb	High-side driver bootstrap supply	Connected to switch node (Vs) via bootstrap diode/cap; supplies HDrv with >10V headroom above Vs.
9 HDrv	High-side MOSFET gate driver output	Drives N-channel MOSFET drain to Vs; 1A peak current enables fast turn-on of high-Qg devices.
10 Vs	Switch node connection	Node between high-side drain and low-side source; returns high-side driver current and connects bootstrap cap.
11 Vcc	Logic and bias supply	4.5–13.2V input; powers internal circuits and error amp - decoupled with ≥0.1µF to Gnd (Pin 13).
12 OCset	Overcurrent threshold setting	Resistor from this pin to low-side MOSFET drain sets trip point: I_trip ≈ 10µA × R_DS(on).
13 Gnd	Signal ground reference	Reference for Fb, Comp, SS/SD, SYNC, Rt - must be star-connected to minimize noise coupling.
14 Rt	Oscillator frequency setting	Resistor to Gnd sets f_sw: e.g., 120kΩ → 200kHz, 51kΩ → 400kHz - enables precise frequency tuning.

Key Features

Feature	Design Value
High-voltage operation	Supports 100V max input - enables direct use in 48V/60V DC distribution without pre-regulation.
Independent driver supplies	Vb and DRVcc pins allow separate optimization of high/low-side gate drive - improves reliability under transient load.
R_DS(on)-based current sensing	Eliminates dedicated current-sense resistor - reduces power loss, board area, and BOM cost in high-current PoL.
Programmable soft-start	Capacitor on SS/SD pin controls output ramp rate - prevents inrush current and enables controlled power-up sequencing.
Hiccup-mode overcurrent protection	Auto-retry after fault clears - maintains system availability during temporary overload or short-circuit events.

Applications

48V Telecom Rectifier Module

Industrial PLC Power Supply

Use Scenario: Converting -48V or +48V telecom battery bus to 3.3V/5V for line cards and control logic.

IC Role / Device Role / Timing Role: Primary PWM controller managing synchronous buck stage with external 100V MOSFETs and 200kHz switching.

Use Value: High input voltage tolerance and hiccup OCP ensure uninterrupted operation during battery sag or hot-swap events.

Use Scenario: Generating isolated 24V and 5V rails from 48V factory DC bus in programmable logic controllers.

IC Role / Device Role / Timing Role: Non-isolated buck controller driving 100V MOSFETs in distributed PoL architecture with SYNC pin tied to system clock.

Use Value: External synchronization reduces conducted EMI across multiple converters sharing same input bus.

Networking Switch ASIC Core Supply

Server Baseboard Management Controller (BMC)

Use Scenario: Providing tightly regulated 0.85V core supply to high-speed Ethernet switch ASICs with dynamic load steps.

IC Role / Device Role / Timing Role: Voltage-mode controller with 1.25V reference and transconductance error amp enabling fast transient response.

Use Value: Precision reference and low-noise COMP pin support <±1% output accuracy under 10A load transients.

Use Scenario: Delivering 3.3V standby power to BMC microcontroller and sensors from 48V backplane in datacenter servers.

IC Role / Device Role / Timing Role: Always-on buck controller operating at 100kHz for low quiescent current; SS/SD pin used for firmware-controlled enable.

Use Value: Low static supply current (6mA Vcc, 0.3mA DRVcc) extends uptime during system sleep states.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage synchronous buck controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP8765GQ-Z	Integrated 100V MOSFETs; fixed 500kHz f_sw; no SYNC or Rt pin; smaller 3mm × 3mm QFN.	Targeted at space-constrained, lower-power (<15A) applications where integration reduces layout complexity.	Select when board area is critical and external MOSFETs are unnecessary; not suitable for >20A or variable-frequency designs.
LTC3891EFE#PBF	150V input rating; dual-output capability; current-mode control; higher BOM cost and larger SO-16EP package.	Used in redundant or dual-rail industrial supplies requiring tighter current matching and wider VIN range.	Select when input exceeds 100V or dual-output tracking is required; adds complexity but improves current accuracy.

Compared with MP8765GQ-Z and LTC3891EFE#PBF, the IR3651SPBF offers optimal balance of external MOSFET flexibility, programmable frequency, and cost-effective SOIC-14 packaging for 10–30A 48V PoL systems - especially where EMI control via SYNC and thermal management via discrete layout are design priorities.

Availability

IR3651SPBF is available at Aetrix Electronics and suitable for 48V telecom rectifiers, industrial PLC power supplies, and networking switch core regulators requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for IR3651SPBF 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-voltage analog and mixed-signal solutions.

The IR3651SPBF belongs to Infineon's high-voltage DC/DC controller product line, designed specifically for efficient, robust, and cost-optimized synchronous buck conversion in telecom, industrial, and computing infrastructure.

FAQ

What is the minimum recommended input voltage for reliable startup?

The IR3651SPBF requires Vcc ≥ 4.17V to exit under-voltage lockout. With typical 12V auxiliary bias, startup is guaranteed down to 12V input. For direct bus operation, ensure Vin ≥ 12V - the device is not rated for startup below this level, even if Vcc is pre-biased.

Can the IR3651SPBF drive 150V MOSFETs?

No. While the Vs pin tolerates up to 150V, the high-side driver (HDrv) and bootstrap circuit (Vb) are rated for ≤16V differential between Vb and Vs. Driving 150V MOSFETs would exceed Vb-to-Vs rating and risk driver failure - maximum recommended bus voltage is 100V.

How is overcurrent threshold calculated using the OCset pin?

OCset draws 10µA (typical) - connect a resistor R_OC from OCset to the source of the low-side MOSFET. Trip current I_trip ≈ 10µA × R_DS(on) of that MOSFET. For example, with R_DS(on) = 5mΩ, R_OC = 100kΩ yields I_trip ≈ 50A. Accuracy depends on MOSFET R_DS(on) tolerance and temperature drift.

Is the IR3651SPBF RoHS-compliant and lead-free?

Yes. The "PBF" suffix in IR3651SPBF denotes lead-free and RoHS-compliant packaging. It uses matte tin plating on the SOIC-14 leads and meets JEDEC J-STD-020 moisture sensitivity level 2 (MSL-2) at 260°C reflow profile.

111-3053PBF Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 14-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Output Type:: Transistor Driver

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Number of Outputs:: 1

Output Phases:: 1

Voltage - Supply (Vcc/Vdd):: 4.5V ~ 13.2V

Frequency - Switching:: 100kHz ~ 400kHz

Duty Cycle (Max):: 80%

Synchronous Rectifier:: Yes

Clock Sync:: Yes

Serial Interfaces:: -

Control Features:: Current Limit, Enable, Soft Start

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SOIC

111-3053PBF FAQ

1.How can I place an order for 111-3053PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for 111-3053PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 111-3053PBF reliable?

The price and inventory of 111-3053PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 111-3053PBF is usually 5 days.

3.What payment methods are accepted for 111-3053PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 111-3053PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 111-3053PBF?

111-3053PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 111-3053PBF order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 111-3053PBF?

For technical support, including 111-3053PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 111-3053PBF requirements.

6.How does Aetrix verify that 111-3053PBF is sourced from the original manufacturer or authorized distributors?

All 111-3053PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 111-3053PBF meets industry standards.

7.What is the process for return or replacement of 111-3053PBF?

All 111-3053PBF units undergo pre-shipment inspection (PSI). If there is an issue with 111-3053PBF, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 111-3053PBF part is unused and in its original packaging.

Return procedure for 111-3053PBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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