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Infineon Technologies IR3637ASPBF
- Part No.:
- IR3637ASPBF
- Manufacturer:
- Infineon Technologies
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
IR3637ASPBF.pdf
- Description:
- IC REG CTRLR BUCK 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,367
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Product details
Overview
IR3637ASPBF from Infineon Technologies is a fixed-frequency, voltage-mode synchronous buck controller IC in an 8-pin SOIC package, designed for on-board DC-DC conversion. It features a 0.8V internal reference, 600kHz oscillator, under-voltage lockout (UVLO) on both Vcc (4.2V threshold) and Vc (3.3V threshold), programmable soft-start, and output short-circuit protection with latched shutdown. Used in graphics card and memory power supplies delivering up to 6A at 1.8V.
For engineers reviewing the IR3637ASPBF datasheet, IR3637ASPBF pinout, IR3637ASPBF application, or IR3637ASPBF equivalent, this page provides verified functional identity, confirmed SOIC-8 package mapping, validated 8-pin terminal roles, real-world startup timing dependencies, and design-meaningful electrical specifications - all extracted from Infineon's official documentation.
Technical Context
The IR3637ASPBF implements a voltage-mode PWM control architecture with a precision 0.8V reference and internal 600kHz oscillator, eliminating external timing components. Its error amplifier compares feedback voltage against the reference, and the resulting error signal modulates duty cycle via comparison with a linear sawtooth ramp.
It integrates dual 0.5A peak gate drivers (HDrv/LDrv) for external N-channel MOSFETs, supports bootstrap or charge-pump high-side drive (Vc ≥ 4V above bus), and includes dedicated UVLO, soft-start (SS/SD pin), and output under-voltage latch-off (Fb < 0.4V triggers shutdown). All protections are hardware-based with no microcontroller dependency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Fixed 600 kHz - enables compact magnetics and input/output filtering with predictable EMI profile. |
| Feedback Reference Voltage | 0.800 V ±1% - sets output voltage accuracy; used with external resistor divider to regulate down to 0.8V. |
| Vcc UVLO Threshold | 4.2 V with 0.25 V hysteresis - ensures clean startup only when main bias rail is stable. |
| Vc UVLO Threshold | 3.3 V with 0.2 V hysteresis - prevents high-side driver operation unless boost supply meets minimum headroom. |
| Soft-Start Charge Current | 25 µA - determines ramp time of SS capacitor; 0.1 µF yields ~4 ms startup. |
| Output Short Detection | Fb < 0.4 V latches shutdown - protects MOSFETs and inductor during sustained overload or short. |
| Gate Drive Capability | 0.5 A peak per driver (HDrv/LDrv) - supports fast switching of low-RDS(on) N-MOSFETs up to ~6 A load. |
Pinout & Package
Package: 8-pin SOIC (Small Outline Integrated Circuit), surface-mount, standard JEDEC MS-012AC footprint, θJA = 154°C/W, θJC = 41.2°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Fb | Feedback input | Inverting input of error amplifier; senses output voltage via resistor divider; triggers latch-off if < 0.4 V. |
| Vcc | Bias supply input | Powers internal logic and low-side driver; requires 0.1 µF ceramic decoupling to Gnd. |
| LDrv | Low-side gate driver output | Drives source-connected N-MOSFET; 0.5 A peak sink/source capability. |
| Gnd | Power and signal reference | Common return for Vcc, LDrv, HDrv, Comp, SS/SD; must connect directly to ground plane. |
| HDrv | High-side gate driver output | Drives gate of high-side N-MOSFET; requires external bootstrap/charge-pump (Vc ≥ 4 V above bus). |
| Vc | High-side driver supply | Provides floating supply for HDrv; needs 0.1–1 µF decoupling to Gnd; UVLO at 3.3 V. |
| Comp | Error amplifier compensation | Connects RC network to Gnd for loop stability; sets phase margin and transient response. |
| SS/SD | Soft-start / Shutdown control | Capacitor-to-Gnd sets startup time; pulled < 0.4 V to force immediate shutdown of both drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 600 kHz oscillator | Eliminates external timing components and reduces BOM count while enabling predictable EMI filtering. |
| 0.8 V ±1% internal reference | Enables accurate regulation of low-output voltages (e.g., 1.8 V, 1.2 V, 0.8 V) without external reference IC. |
| Dual 0.5 A peak gate drivers | Directly drives standard logic-level N-MOSFETs without external driver stages, reducing layout complexity. |
| Programmable soft-start | Prevents inrush current by linearly ramping duty cycle via external capacitor; avoids output overshoot. |
| Hardware-latched short-circuit protection | Shuts down both drivers permanently until reset via Vcc/Vc recycle or SS/SD pin release - prevents thermal runaway. |
Applications
| Graphics Card VRM | Memory Power Supply |
|---|---|
Use Scenario: Regulating 1.8 V core voltage for GPU memory with 6 A peak load and tight transient response requirements. IC Role / Device Role / Timing Role: Synchronous buck controller managing dual-N-MOSFET power stage; 600 kHz switching enables small inductor (1.0 µH) and fast load-step recovery. Use Value: Achieves < 50 mV output deviation during 4 A load step (2–6 A) due to precise 0.8 V reference and stable voltage-mode loop. | Use Scenario: Providing stable 1.2 V DDR3/DDR4 termination voltage in server DIMMs with space-constrained PCB layout. IC Role / Device Role / Timing Role: On-board DC-DC controller using SOIC-8 footprint to minimize board area; UVLO ensures operation only after system rails stabilize. Use Value: Enables single 5 V input solution via charge-pump Vc generation, eliminating need for auxiliary 12 V rail. |
| Computer Peripheral Regulator | Low-Cost On-Board DC-DC |
Use Scenario: Powering USB hub controllers or PCIe add-in cards requiring regulated 3.3 V from 5 V or 12 V input. IC Role / Device Role / Timing Role: Fixed-frequency voltage-mode controller with integrated drivers - simplifies design vs. discrete gate driver + PWM IC solutions. Use Value: Reduces component count by 4+ parts (oscillator, reference, drivers) versus multi-chip alternatives. | Use Scenario: Cost-sensitive embedded systems needing reliable 1.5 V–3.3 V regulation without microcontroller involvement. IC Role / Device Role / Timing Role: Standalone analog controller with hardware-only protections - no firmware, no configuration required. Use Value: Delivers production-ready power with latch-off short protection and soft-start, minimizing qualification effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2307DN-LF-Z | Integrated MOSFETs (3A), 500 kHz, no Vc pin - single-supply operation only. | Lacks external high-side drive flexibility; unsuitable for >3 A or charge-pump Vc architectures. | Select when board space is critical and load ≤3 A; avoid for graphics/memory apps requiring >4 A or custom FETs. |
| LM5116PW | Current-mode, wide-input (6–100 V), external compensation, no integrated drivers. | Requires external high/low-side drivers and current-sense circuitry; higher design complexity. | Choose for high-input industrial applications (>12 V) or where current-mode loop stability is mandatory. |
Compared with MP2307DN-LF-Z and LM5116PW, the IR3637ASPBF uniquely balances external FET control, fixed-frequency simplicity, and hardware-latched protection - making it optimal for cost-sensitive, medium-current (4–6 A), 5 V–12 V input PC and peripheral power designs.
Availability
IR3637ASPBF is available at Aetrix Electronics and suitable for graphics card VRMs, memory power supplies, and computer peripheral regulators requiring stable component supply, long-term lifecycle support, and consistent SOIC-8 packaging.
Supply support for IR3637ASPBF 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 IECQ QC 080000.
The IR3637ASPBF belongs to Infineon's legacy IR (International Rectifier) analog power controller product line, engineered specifically for cost-effective, high-reliability synchronous buck regulation in computing and consumer electronics.
FAQ
What is the minimum recommended soft-start capacitor value for stable startup?
The IR3637ASPBF requires a minimum 0.1 µF ceramic capacitor from SS/SD to Gnd to achieve ~4 ms startup time and prevent premature error amplifier activation. Smaller values (< 0.047 µF) risk insufficient soft-start duration, causing output overshoot or false UVLO triggering during ramp-up.
Can IR3637ASPBF operate with only a 5 V input without a separate Vc supply?
Yes - a charge-pump circuit (e.g., diode + capacitor between LDrv and Vc) can generate the required Vc voltage (~10 V) from the 5 V rail, enabling single-supply operation. The datasheet Figure 6 confirms this topology; however, Vc must remain ≥ 4 V above the output bus to ensure high-side MOSFET enhancement.
How does the feedback UVLO function differ from the main UVLO circuits?
The feedback UVLO (triggered at Fb < 0.4 V) is independent of Vcc/Vc UVLO and serves only for output short detection. It latches off both drivers until power cycling, whereas Vcc/Vc UVLO is non-latching and resumes operation once supply voltages exceed thresholds (4.2 V / 3.3 V) with hysteresis.
What is the maximum achievable output current using IR3637ASPBF?
While not limited by the controller itself, the IR3637ASPBF has been validated in 6 A applications (e.g., 1.8 V @ 6 A) using appropriate external MOSFETs (e.g., IRF7832 + IRF7822), 1.0 µH inductor, and dual 150 µF low-ESR output capacitors. Thermal design and MOSFET RDS(on) determine practical limits beyond 6 A.
IR3637ASPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 8-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 ~ 5.5V
- Frequency - Switching:
- 600kHz
- Duty Cycle (Max):
- 76%
- 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:
- 8-SOIC
IR3637ASPBF FAQ
1.How can I place an order for IR3637ASPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3637ASPBF 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 IR3637ASPBF reliable?
The price and inventory of IR3637ASPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3637ASPBF is usually 5 days.
3.What payment methods are accepted for IR3637ASPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3637ASPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3637ASPBF?
IR3637ASPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3637ASPBF 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 IR3637ASPBF?
For technical support, including IR3637ASPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3637ASPBF requirements.
6.How does Aetrix verify that IR3637ASPBF is sourced from the original manufacturer or authorized distributors?
All IR3637ASPBF 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 IR3637ASPBF meets industry standards.
7.What is the process for return or replacement of IR3637ASPBF?
All IR3637ASPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3637ASPBF, 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 IR3637ASPBF part is unused and in its original packaging.
Return procedure for IR3637ASPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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