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Infineon Technologies IR3637ASTRPBF
- Part No.:
- IR3637ASTRPBF
- Manufacturer:
- Infineon Technologies
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
IR3637ASTRPBF.pdf
- Description:
- IC REG CTRLR BUCK 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,062
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Product details
Overview
IR3637ASTRPBF 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 with precise 0.8 V reference regulation, 600 kHz internal oscillator, and dual N-channel MOSFET gate drive (0.5 A peak). It supports single 5 V supply operation, features programmable soft-start, output under-voltage latch-off, and input UVLO thresholds of 4.2 V (Vcc) and 3.3 V (Vc), targeting low-cost graphics card and memory power supplies.
For engineers reviewing the IR3637ASTRPBF datasheet, IR3637ASTRPBF pinout, IR3637ASTRPBF application, or IR3637ASTRPBF equivalent, key selection considerations include its 0.8 V feedback reference accuracy (±1%), 600 kHz fixed switching frequency, dual-driver timing control with dead-time, short-circuit protection via Fb < 0.4 V detection, and compatibility with external charge-pump boost for high-side gate drive in single-supply configurations.
Technical Context
The IR3637ASTRPBF implements a voltage-mode PWM architecture with an internal 600 kHz oscillator generating a linear sawtooth ramp, compared against the error amplifier's output to produce variable-duty-cycle gate pulses. Its error amplifier uses a precision 0.8 V internal reference and accepts feedback from an external resistor divider at the Fb pin.
UVLO circuitry independently monitors Vcc (4.2 V threshold, 0.2 V hysteresis) and Vc (3.3 V threshold, 0.2 V hysteresis); shutdown is asserted by pulling SS/SD below 0.4 V; soft-start is implemented via internal 25 µA current source charging an external capacitor, disabling feedback UVLO until Fb reaches ~0.8 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Fixed 600 kHz - enables compact magnetics and filtering with predictable EMI profile. |
| Feedback Reference Voltage | 0.800 V ±1% - sets output voltage accuracy for low-voltage rails (e.g., 1.8 V, 1.2 V) using standard resistor dividers. |
| Vcc UVLO Threshold | 4.2 V with 0.2 V hysteresis - ensures stable startup and prevents erratic operation during brownout on bias rail. |
| Vc UVLO Threshold | 3.3 V with 0.2 V hysteresis - safeguards high-side driver functionality when boost supply drops. |
| Soft-Start Current Source | 25 µA - linearly charges external capacitor to control output voltage ramp time and limit inrush current. |
| Output Short Detection | Latches off drivers when Fb falls below 0.4 V - provides robust protection against sustained output shorts. |
| Gate Drive Capability | 0.5 A peak per driver (HDrv/LDrv) - supports fast switching of logic-level N-MOSFETs up to ~6 A load. |
Pinout & Package
Package: 8-pin SOIC (Small Outline Integrated Circuit), surface-mount, JEDEC MS-012AC, 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 to regulate Vout at 0.8 V reference. |
| Vcc | Bias Supply Input | Powers internal logic and low-side driver; requires ≥0.1 µF high-frequency decoupling to ground. |
| LDrv | Low-Side Gate Driver Output | Sources/sinks 0.5 A peak to drive N-MOSFET source-connected to ground; requires low-inductance layout. |
| Gnd | Signal & Power Ground | Common return for Vcc, Vc, Fb, Comp, and SS/SD; must connect directly to PCB ground plane. |
| HDrv | High-Side Gate Driver Output | Drives N-MOSFET drain-connected to input bus; requires external charge pump (e.g., BAT54 + capacitor) for bootstrap voltage. |
| Vc | High-Side Driver Supply | Provides gate drive voltage ≥4 V above bus; requires ≥0.1 µF decoupling and clamping diode to prevent negative swing. |
| Comp | Error Amplifier Compensation | Connects external RC network to ground for loop stability; sets phase margin and transient response. |
| SS/SD | Soft-Start / Shutdown Control | Charged by 25 µA current for soft-start; pulled <0.4 V to disable both drivers and enter shutdown mode. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 600 kHz switching frequency | Enables consistent EMI filtering design and eliminates need for external timing components. |
| 0.8 V ±1% internal reference | Supports tight output regulation for sub-2 V digital rails without external reference ICs. |
| Independent Vcc and Vc UVLO | Prevents partial operation and shoot-through risk by ensuring both bias and high-side supplies are valid. |
| Programmable soft-start with current-source ramp | Eliminates output overshoot and inrush stress via controlled 1–2 V SS/SD voltage ramp. |
| Latched short-circuit protection | Halts switching immediately upon Fb < 0.4 V and holds off until power cycle or SS/SD reset. |
Applications
| Graphics Card Core Power | DDR Memory VDDQ Supply |
|---|---|
|
Use Scenario: Provides regulated 1.2 V or 1.35 V core voltage to GPU ASICs under dynamic load transients up to 6 A. IC Role / Device Role / Timing Role: Synchronous buck controller managing dual N-MOSFET power stage with 600 kHz fixed timing and fast transient response. Use Value: Enables compact board layout with small inductor (e.g., 1.0 µH) and low-ESR POSCAP output capacitors while maintaining ±1% output accuracy. |
Use Scenario: Delivers tightly regulated 1.5 V or 1.35 V to DDR3/DDR4 memory modules in desktop and embedded systems. IC Role / Device Role / Timing Role: Voltage-mode PWM controller with 0.8 V reference and programmable soft-start to meet JEDEC VDDQ ramp-rate requirements. Use Value: Ensures monotonic startup and avoids memory initialization failure via controlled 4 ms soft-start (0.1 µF CSS). |
| Low-Cost Peripheral Regulator | On-Board FPGA I/O Bank Supply |
|
Use Scenario: Powers USB controller, SATA bridge, or PCIe switch logic rails (1.8 V, 3.3 V) from 5 V or 12 V input. IC Role / Device Role / Timing Role: Single-chip synchronous controller eliminating external oscillator and reference, reducing BOM count. Use Value: Achieves >90% efficiency at 6 A with discrete MOSFETs and supports cost-sensitive designs via SOIC-8 packaging. |
Use Scenario: Supplies configurable 1.2 V–1.8 V I/O banks for Xilinx or Intel FPGAs requiring independent rail sequencing. IC Role / Device Role / Timing Role: Programmable soft-start and shutdown pin (SS/SD) allow integration into FPGA power management trees. Use Value: Enables synchronized power-up across multiple rails using shared SS/SD control signals and external transistor gating. |
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 | 3.3–28 V input range; 500 kHz switching; integrated MOSFETs (no external FETs required); no separate Vc pin. | Targeted at simpler, lower-current (<3 A) applications where board space is critical and external FETs undesirable. | Select MP2307 if integrating power stage saves layout complexity and 3 A max output suffices; IR3637A preferred for >4 A with optimized discrete FETs. |
| LM5116PW | Wide-input (6–100 V), current-mode control, adjustable frequency (50–750 kHz), no integrated drivers - requires external high/low-side gate drivers. | Suited for industrial/high-voltage buck applications (e.g., 24 V/48 V input) where IR3637A's 14 V Vc limit and 5 V Vcc constraint are insufficient. | Choose LM5116 for >12 V input or current-mode stability needs; IR3637A remains optimal for cost-sensitive 5 V/12 V on-board DC-DC with discrete FET flexibility. |
Compared with MP2307DN-LF-Z and LM5116PW, the IR3637ASTRPBF offers a balanced trade-off: discrete-FET control for thermal and efficiency optimization at 4–6 A, fixed 600 kHz timing for EMI predictability, and dedicated Vc/Vcc UVLO for robust multi-rail sequencing - making it ideal for graphics and memory subsystems where performance, cost, and layout control are jointly prioritized.
Availability
IR3637ASTRPBF is available at Aetrix Electronics and suitable for graphics card core power, DDR memory VDDQ supply, and low-cost peripheral regulator applications requiring stable component supply, long-term production continuity, and RoHS-compliant SOIC packaging.
Supply support for IR3637ASTRPBF 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 certifications including ISO/TS 16949 and AEC-Q100.
The IR3637A belongs to Infineon's legacy analog power controller product line, engineered specifically for cost-effective, high-efficiency synchronous buck regulation in computing and consumer electronics where discrete MOSFET optimization and precise low-voltage regulation are essential.
FAQ
What is the minimum recommended soft-start capacitor value for stable startup?
The IR3637ASTRPBF requires a minimum 0.01 µF ceramic capacitor on the SS/SD pin for basic functionality, but a 0.1 µF capacitor is recommended to achieve a controlled 4 ms startup time and prevent output overshoot under full load. Larger values extend ramp time linearly; values exceeding 1 µF may cause excessive delay and reduce system responsiveness during power cycling.
Can the IR3637ASTRPBF operate with only a 5 V input supply without a charge pump?
No - the IR3637ASTRPBF requires a separate Vc supply ≥4 V above the output bus voltage to drive the high-side N-MOSFET gate. With only 5 V input, a charge pump (e.g., BAT54 diode + 0.1 µF capacitor) is mandatory to generate the required Vc ≈ 9–10 V; direct connection of Vc to 5 V will result in insufficient high-side gate drive and converter failure.
How does the feedback UVLO function interact with soft-start?
During soft-start, a 64 µA current is injected into the Fb pin, raising the positive input of the feedback UVLO comparator to ~1.6 V - effectively disabling the 0.4 V UVLO threshold until SS/SD reaches ~1 V. This prevents false latch-off during startup while the output ramps; UVLO re-enables only after soft-start completes and Fb stabilizes near 0.8 V.
What is the maximum continuous output current supported by the IR3637ASTRPBF gate drivers?
The IR3637ASTRPBF delivers 0.5 A peak source/sink per driver (HDrv/LDrv), supporting continuous output currents up to 6 A with appropriately selected logic-level N-MOSFETs (e.g., RDS(on) ≤ 10 mΩ, Qg ≤ 20 nC), proper thermal layout, and adequate input/output capacitance - verified in Infineon's typical 1.8 V/6 A application circuit (Fig. 5).
IR3637ASTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 8-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):
- 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
IR3637ASTRPBF FAQ
1.How can I place an order for IR3637ASTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3637ASTRPBF 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 IR3637ASTRPBF reliable?
The price and inventory of IR3637ASTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3637ASTRPBF is usually 5 days.
3.What payment methods are accepted for IR3637ASTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3637ASTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3637ASTRPBF?
IR3637ASTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3637ASTRPBF 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 IR3637ASTRPBF?
For technical support, including IR3637ASTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3637ASTRPBF requirements.
6.How does Aetrix verify that IR3637ASTRPBF is sourced from the original manufacturer or authorized distributors?
All IR3637ASTRPBF 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 IR3637ASTRPBF meets industry standards.
7.What is the process for return or replacement of IR3637ASTRPBF?
All IR3637ASTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3637ASTRPBF, 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 IR3637ASTRPBF part is unused and in its original packaging.
Return procedure for IR3637ASTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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