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

Infineon Technologies IR3638STRPBF

Name: IR3638STRPBF
Brand: Infineon Technologies
SKU: IR3638STRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IR3638STRPBF

Manufacturer:: Infineon Technologies

Category:: DC DC Switching Controllers

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

Datasheet:: IR3638STRPBF.pdf

Description:: IC REG CTRLR BUCK 14SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:3,114

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Product details

Overview

IR3638STRPBF from Infineon Technologies is a fixed-frequency (400 kHz) voltage-mode synchronous PWM buck controller in 14-pin SOIC, designed for tracking applications with dual-function Vp/Enable pin, 0.6 V output regulation capability, and latch-off short-circuit protection. It drives external N-channel MOSFETs in on-board DC/DC converters for CPU core voltage regulation.

For engineers reviewing the IR3638STRPBF datasheet, IR3638STRPBF pinout, IR3638STRPBF application, or IR3638STRPBF equivalent, key selection criteria include programmable soft-start timing via external capacitor, pre-bias startup capability, UVLO thresholds (Vcc start: 4.25 V, Enable start: 0.65 V), and dedicated power ground (PGnd) vs. signal ground (Gnd) separation.

Technical Context

The IR3638STRPBF implements a transconductance error amplifier with 440–1300 µmho gain and ±6 mV input offset, referenced to a 0.6 V internal bandgap. Its fixed 400 kHz oscillator enables compact magnetics and low-ESR ceramic output capacitors.

Tracking functionality is achieved by comparing feedback (Fb) against an external reference voltage applied to Vp/Enable, enabling precise sequencing of multiple rails. Short-circuit protection latches off PWM outputs when Fb drops below 0.4 V, while pre-bias startup avoids output disturbance by holding synchronous MOSFETs off until SS reaches ~2.0 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Switching Frequency	400 kHz (fixed, internal oscillator; enables small inductors & ceramic caps)
Output Voltage Range	0.6 V minimum (set by resistor divider; supports modern low-VDD CPU cores)
Vcc UVLO Threshold	4.25 V (rising edge); 4.0 V (falling edge); 0.25 V hysteresis prevents chatter
Enable Threshold	0.65 V (rising edge); 0.6 V (falling edge); 42.5 mV hysteresis ensures clean enable/disable
Soft-Start Current	22 µA (typical); charges external capacitor to control inrush current ramp rate
Max Duty Cycle	85 % (at Fb = 0.6 V, Vp = 0.8 V); limits high-side conduction during low-input conditions
Error Amp Transconductance	440–1300 µmho; supports Type III compensation for stable loop with low-ESR caps

Pinout & Package

IR3638STRPBF is housed in a 14-pin SOIC NB (Small Outline Integrated Circuit, Narrow Body) package with Θ_JA = 88 °C/W. Pin 1 is Fb (feedback input), Pin 2 is Vp/Enable (dual-function tracking reference and enable), Pins 6 and 9 are LDrv and HDrv (MOSFET gate drivers), Pin 8 is PGnd (power ground for drivers), and Pin 7 is Gnd (signal ground).

Pin/Terminal	Circuit Role	Design Meaning
1 Fb	Inverting input to error amplifier	Connected to output via resistor divider; sets regulated output voltage
2 Vp / Enable	Non-inverting input + enable control	Accepts external reference for tracking; logic-high >0.65 V enables operation
4 Vcc	IC core supply	Powers internal logic and low-side driver; requires ≥0.1 µF HF bypass to PGnd
6 LDrv	Low-side MOSFET gate driver	Drives N-channel sync rectifier; 30–60 ns rise/fall time into 1.5 nF load
7 Gnd	Signal ground reference	Reference for internal control circuitry; separate from PGnd to avoid noise coupling
8 PGnd	Power ground	Return path for HDrv/LDrv currents; must connect to system power ground plane
9 HDrv	High-side MOSFET gate driver	Drives N-channel high-side switch; requires BAT54/1N4148 clamp diode to PGnd
10 Vc	High-side driver supply	Bias supply for bootstrap or charge-pump high-side driver; up to 20 V max
12 Comp	Error amplifier output	Connects to Type III compensation network (R/C) for loop stability
13 SS	Soft-start control	External capacitor sets startup time; 22 µA current source ramps voltage linearly

Key Features

Feature	Design Value
Pre-bias startup	Enables safe start into pre-charged output without oscillation; holds sync FETs off until SS ≈ 2.0 V
Tracking capability	Vp pin accepts external reference (e.g., from another rail) to sequence or match output voltage slope
Latch-off short-circuit protection	Fb < 0.4 V triggers permanent shutdown until reset via Vcc/Enable cycle
Dedicated PGnd/Gnd separation	Minimizes switching noise injection into error amplifier and control logic
Fixed 400 kHz frequency	Eliminates external timing components; ensures predictable EMI profile and component sizing

Applications

Game Console Power Rails

Graphics Card GPU Core Supply

Use Scenario: Regulating multiple voltage rails (e.g., GPU core, memory, I/O) with synchronized ramp-up during boot.

IC Role / Device Role / Timing Role: Synchronous buck controller providing tracking via Vp pin to match reference rail slope during power-on sequencing.

Use Value: Eliminates need for external sequencers; ensures safe voltage ordering without cross-rail contention or inrush overload.

Use Scenario: Delivering tightly regulated 0.8–1.2 V to high-performance GPU cores under dynamic load.

IC Role / Device Role / Timing Role: Fixed-frequency voltage-mode controller driving discrete N-MOSFETs with fast gate drive (30–60 ns) and dead-time control.

Use Value: Supports rapid load transient response via transconductance error amp and Type III compensation.

Computing Peripheral Regulators

CPU Core Voltage Tracking

Use Scenario: On-board 5 V or 3.3 V regulation for USB controllers, PCIe switches, or SATA PHYs.

IC Role / Device Role / Timing Role: Compact synchronous buck controller using small external inductors due to 400 kHz switching.

Use Value: Reduces solution footprint and BOM count versus lower-frequency alternatives requiring larger magnetics.

Use Scenario: Matching CPU core voltage ramp to chipset or memory rail during cold boot or resume-from-sleep.

IC Role / Device Role / Timing Role: Tracking controller using Vp as external reference to replicate another rail's voltage profile.

Use Value: Prevents reverse current flow and latch-up during multi-rail power-up by enforcing monotonic voltage alignment.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ISL6263CRZ-T	300 kHz fixed frequency; integrated MOSFET drivers with adjustable dead time; no Vp tracking pin	Designed for notebook CPU VRMs; lacks explicit tracking input but supports VID interface	Choose for integrated-driver simplicity in portable systems where tracking is handled digitally
TPS54620RGYR	Variable frequency (100–600 kHz); adaptive on-time control; no dedicated PGnd/Gnd separation	Optimized for wide-input industrial DC/DC; uses single ground; higher integration (integrated FETs)	Choose for input voltage flexibility and reduced external component count where ground separation is less critical

Compared with ISL6263CRZ-T and TPS54620RGYR, the IR3638STRPBF uniquely provides a dedicated analog tracking input (Vp), strict PGnd/Gnd isolation for noise-sensitive applications, and fixed 400 kHz operation-making it optimal for deterministic EMI design and precise analog rail sequencing in gaming and graphics platforms.

Availability

IR3638STRPBF is available at Aetrix Electronics and suitable for game console power management, graphics card GPU core regulation, and computing peripheral voltage regulation requiring stable component supply across production lifecycles.

Supply support for IR3638STRPBF 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 global manufacturing and quality certification to ISO/TS 16949 and ISO 14001.

The IR3638 belongs to Infineon's legacy IR (International Rectifier) analog power controller product line, engineered specifically for high-efficiency, externally driven synchronous buck topologies in space-constrained computing and graphics applications.

FAQ

What is the purpose of the separate PGnd and Gnd pins?

The IR3638STRPBF separates power ground (Pin 8, PGnd) from signal ground (Pin 7, Gnd) to prevent high-current switching noise from the MOSFET drivers from coupling into the error amplifier and control logic. PGnd must be connected directly to the system's power ground plane, while Gnd serves only the IC's internal bias and reference circuits-ensuring stable regulation under dynamic load.

How does the Vp/Enable pin enable tracking functionality?

The Vp/Enable pin (Pin 2) serves two roles: as a non-inverting input to the error amplifier and as an enable signal. When used for tracking, an external voltage (e.g., from another regulator's output) is applied to Vp, causing the IR3638 to regulate its own output to match that reference. The 0.65 V enable threshold ensures the device activates only after the tracking source is stable.

What external components are required for basic operation?

Minimum external components include: (1) resistor divider from Vout to Fb (Pin 1) to set output voltage, (2) soft-start capacitor from SS (Pin 13) to ground, (3) 0.1 µF ceramic capacitor from Vcc (Pin 4) to PGnd, (4) gate resistors and BAT54 clamp diode for HDrv (Pin 9), and (5) output LC filter (inductor + bulk/ceramic capacitors). Compensation network (R/C) on Comp (Pin 12) is required for stability.

Does the IR3638STRPBF support pre-biased output startup?

Yes-the IR3638STRPBF supports pre-bias startup by holding synchronous MOSFETs off until the soft-start voltage reaches ~2.0 V. During this phase, the controller operates asynchronously to gently charge the output without forcing reverse current through the low-side FET, preventing output voltage disturbance and ensuring reliable boot into pre-charged loads.

IR3638STRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

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

Packaging:: Tape & Reel (TR)

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):: 5V ~ 13.2V

Frequency - Switching:: 400kHz

Duty Cycle (Max):: 85%

Synchronous Rectifier:: Yes

Clock Sync:: No

Serial Interfaces:: -

Control Features:: Enable, Soft Start

Operating Temperature:: 0°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SOIC

IR3638STRPBF FAQ

1.How can I place an order for IR3638STRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IR3638STRPBF 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 IR3638STRPBF reliable?

The price and inventory of IR3638STRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3638STRPBF is usually 5 days.

3.What payment methods are accepted for IR3638STRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3638STRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IR3638STRPBF?

IR3638STRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IR3638STRPBF 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 IR3638STRPBF?

For technical support, including IR3638STRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3638STRPBF requirements.

6.How does Aetrix verify that IR3638STRPBF is sourced from the original manufacturer or authorized distributors?

All IR3638STRPBF 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 IR3638STRPBF meets industry standards.

7.What is the process for return or replacement of IR3638STRPBF?

All IR3638STRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3638STRPBF, 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 IR3638STRPBF part is unused and in its original packaging.

Return procedure for IR3638STRPBF:

1.Submit a request within 90 days.

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

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