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Analog Devices Inc. LT8636EV#PBF
- Part No.:
- LT8636EV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TFQFN Exposed Pad
- Datasheet:
-
LT8636EV#PBF.pdf
- Description:
- IC REG BUCK ADJ 5A 20LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:518
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Product details
Overview
LT8636EV#PBF from Analog Devices is a 42V, 5A continuous synchronous step-down regulator with Silent Switcher architecture, 2.5µA quiescent current in regulation, 30ns minimum on-time, and 20-lead 4mm × 3mm LQFN package. It delivers up to 96% efficiency at 1MHz (12VIN to 5VOUT) and supports adjustable switching frequency from 200kHz to 3MHz for automotive power supplies.
For engineers reviewing the LT8636EV#PBF datasheet, LT8636EV#PBF pinout, LT8636EV#PBF application, or LT8636EV#PBF equivalent, key selection criteria include ultralow IQ in Burst Mode, EMI-optimized Silent Switcher layout, internal compensation, AEC-Q100 qualification (–40°C to 125°C), and support for spread spectrum modulation and CLKOUT synchronization.
Technical Context
The LT8636EV#PBF implements peak current mode control with a fixed internal compensation network, enabling stable operation without external loop components. Its 30ns minimum on-time supports high step-down ratios (e.g., 36VIN to 3.3VOUT) at 2MHz or higher switching frequencies.
Silent Switcher architecture uses symmetrical layout and integrated bypass capacitors to suppress common-mode EMI; spread spectrum modulation further reduces peak radiated emissions by ±20% frequency dithering. The device integrates top/bottom NMOS switches with 66mΩ/27mΩ RDS(on), supports forced continuous mode (FCM) for fast transient response, and features accurate 0.970V feedback reference with ±0.004%/V line regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide automotive battery transients including cold-crank (4.5V) and load-dump (40V). |
| Output Current | 5A continuous, 7A peak - sustains short-term surge loads without thermal shutdown under proper PCB thermal design. |
| Quiescent Current | 2.5µA in regulation (12VIN→3.3VOUT) - enables >10-year battery life in always-on automotive modules. |
| Switching Frequency | 200kHz to 3MHz (RT-programmable) - allows optimization of size (high-freq) vs. efficiency (low-freq) and EMI compliance. |
| Feedback Reference | 0.970V ±3mV - enables precise output voltage setting with <±1% total error over temperature and line/load. |
| Min On-Time | 30ns - permits direct 42V-to-3.3V conversion at 2MHz without requiring pre-regulation. |
| EMI Performance | CISPR 25 Class 5 compliant (with filter) - meets stringent automotive radiated emission limits without shielding. |
Pinout & Package
LT8636EV#PBF is housed in a 20-lead 4mm × 3mm × 0.94mm LQFN package with exposed thermal pad (Pin 21 = GND). The package is RoHS-compliant (e4 Au finish), MSL Level 3, and qualified per AEC-Q100 Grade E (–40°C to 125°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PG (1) | Open-drain Power Good | Asserts high when FB is within ±8% of 0.970V and no fault (UVLO, thermal, INTVCC undervoltage); requires external pull-up. |
| BIAS (2) | Bias Supply Input | Reduces VIN current draw when tied to VOUT ≥3.3V; improves light-load efficiency and thermal performance. |
| INTVCC (3) | Internal 3.4V Regulator Bypass | Must be decoupled with ≥1µF low-ESR ceramic capacitor; powers control circuitry and gate drivers. |
| GND (4,13,21) | Ground Return | Pins 4/13 are signal GND; Pin 21 is exposed thermal pad - must be soldered to PCB plane for θJA = 26°C/W (demo board). |
| VIN (6,11) | Main Input Supply | Dual pins reduce IR drop and improve high-current routing; requires local 1µF + 1µF + ≥2.2µF input capacitance. |
| BST (7) | Bootstrap Capacitor Node | Drives high-side switch gate; requires 0.1µF ceramic capacitor between BST and SW with minimal trace length. |
| SW (8–10) | Power Switch Output | Three paralleled pins reduce inductance and losses; connect directly to inductor with compact, low-area copper pour. |
| EN/UV (14) | Enable / Input UVLO Control | Hysteretic threshold (1.00V rise / 0.96V fall); resistor divider sets custom input undervoltage lockout. |
| SYNC/MODE (15) | Operating Mode Select | GND = Burst Mode; float = FCM; INTVCC = spread spectrum; external clock = sync - no external components needed. |
| CLKOUT (16) | Switch Frequency Monitor | Outputs ~200ns pulses at fSW in FCM/spread/sync modes; used to synchronize secondary regulators. |
| RT (17) | Frequency Set Resistor | Resistor to GND programs fSW: 221kΩ = 210kHz, 60.4kΩ = 700kHz, 18.2kΩ = 1.95MHz. |
| TR/SS (18) | Soft-Start / Tracking Input | 1.9µA internal current source charges external capacitor; controls VOUT ramp rate and enables supply tracking. |
| FB (19,20) | Feedback Sense Input | Regulates to 0.970V; dual pins improve noise immunity; requires 4.7–22pF phase-lead capacitor to VOUT. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher Architecture | Integrated symmetric layout and internal bypass caps reduce common-mode EMI by >30dB vs. conventional buck regulators. |
| Ultralow Quiescent Current | 2.5µA IQ in regulation enables >10-year shelf life in battery-backed telematics and ADAS sensors. |
| Spread Spectrum Modulation | ±20% triangular dithering of fSW lowers peak radiated emissions to meet CISPR 25 Class 5 without added filters. |
| Fast Minimum On-Time | 30ns on-time supports single-stage 42V-to-3.3V conversion at 2MHz, eliminating need for cascaded regulation. |
| AEC-Q100 Qualified | Grade E (–40°C to 125°C) qualification ensures reliability in engine bay, infotainment, and ADAS power rails. |
| Integrated Power Switches | 66mΩ top / 27mΩ bottom NMOS with 7.5–12.5A current limit enables 5A continuous output in 4mm × 3mm footprint. |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powering SoC, DSP, and display interfaces in head units with 12V battery input and strict EMI limits. IC Role / Device Role: Primary 5V/3.3V step-down converter delivering clean, low-noise power with spread spectrum enabled. Use Value: Meets CISPR 25 Class 5 radiated emissions without shielding or ferrites, reducing BOM cost and board area. | Use Scenario: Supplying image sensor, ISP, and serializer in rear-view or surround-view cameras. IC Role / Device Role: Always-on 3.3V rail with 2.5µA quiescent current and cold-crank support down to 3.4V. Use Value: Maintains camera functionality during engine start (≥4.5V dropout) and extends battery runtime in parking mode. |
| Industrial PLC I/O Module | Medical Portable Monitor |
Use Scenario: Providing isolated 5V logic supply and 3.3V microcontroller rail in DIN-rail mounted controllers. IC Role / Device Role: High-reliability DC/DC converter handling 42V transients from inductive load switching. Use Value: Withstands 40V load-dump events without latch-off, eliminating need for external TVS clamping. | Use Scenario: Battery-powered patient monitor requiring long operational time and low EMI near sensitive analog front-ends. IC Role / Device Role: Main system supply converting Li-ion (3.0–4.2V) or 12V adapter to regulated 3.3V/5V rails. Use Value: 2.5µA IQ extends battery life beyond 72 hours; Silent Switcher ensures ECG/EEG signals remain uncorrupted. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8640SEV#PBF | Higher 6A continuous rating, 40V max input, same 2.5µA IQ and Silent Switcher architecture; requires different RT resistor for identical fSW. | Supports higher output current and wider input range; pinout differs (24-lead LQFN), not drop-in. | Select when >5A output or >42V input margin required; redesign PCB layout and adjust compensation. |
| TPS54560QPWPRQ1 | 42V, 5A, 145µA IQ (Burst Mode), non-Silent Switcher; larger 20-pin HTSSOP package; no spread spectrum or CLKOUT. | Lacks EMI optimization features; lower light-load efficiency; suitable where radiated EMI is less constrained. | Choose for cost-sensitive automotive applications where CISPR 25 Class 5 is not mandated and PCB space is available. |
Compared with LT8640SEV#PBF and TPS54560QPWPRQ1, the LT8636EV#PBF uniquely combines AEC-Q100 qualification, 2.5µA IQ, Silent Switcher EMI reduction, and spread spectrum in a compact 4mm × 3mm LQFN - making it optimal for space-constrained, EMI-sensitive automotive and industrial systems.
Availability
LT8636EV#PBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial PLC I/O modules requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for LT8636EV#PBF 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT8636EV#PBF belongs to the Silent Switcher® monolithic step-down regulator product line, engineered specifically for ultra-low EMI and ultralow quiescent current in automotive and noise-sensitive applications.
FAQ
What is the maximum continuous output current supported by the LT8636EV#PBF?
The LT8636EV#PBF supports 5A continuous output current under typical thermal conditions (θJA = 26°C/W on demo board). Peak transient capability reaches 7A for short durations. Derating is required above 85°C ambient or with reduced copper area; full 5A operation requires proper thermal pad soldering and ≥4cm² of 2oz copper on the GND plane.
Does the LT8636EV#PBF require external compensation components?
No, the LT8636EV#PBF features internal compensation and operates stably with only standard input/output capacitors and an inductor. External compensation is exclusive to the LT8637 variant; using the LT8636EV#PBF eliminates loop compensation design effort and component count for most 5A applications.
How does the LT8636EV#PBF achieve CISPR 25 Class 5 radiated EMI compliance?
The LT8636EV#PBF achieves CISPR 25 Class 5 compliance via its Silent Switcher architecture - which integrates matched, symmetrical power loops and internal bypass capacitors to cancel magnetic fields - combined with optional spread spectrum modulation. When used with the recommended DC2918A filter layout, it passes Class 5 limits without metal shielding or external EMI filters.
Can the LT8636EV#PBF operate with input voltage below 3.4V?
No, the absolute minimum input voltage for the LT8636EV#PBF is 3.4V as specified in the Absolute Maximum Ratings table. Operation below this voltage may result in undefined behavior, failure to regulate, or inability to exit UVLO. For sub-3.4V inputs, consider the LT8614 or LT8609S, which support down to 2.8V and 3.0V respectively.
What is the purpose of the CLKOUT pin on the LT8636EV#PBF?
The CLKOUT pin on the LT8636EV#PBF outputs a ~200ns-wide pulse synchronized to the internal switch node transitions, active only in forced continuous mode, spread spectrum mode, or synchronization mode. It enables precise timing alignment of multiple regulators in multi-rail systems and simplifies validation of switching frequency and phase relationships.
LT8636EV#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.4V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.97V
- Voltage - Output (Max):
- 42V
- Current - Output:
- 5A
- Frequency - Switching:
- 200kHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-LQFN (4x3)
LT8636EV#PBF FAQ
1.How can I place an order for LT8636EV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8636EV#PBF 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 LT8636EV#PBF reliable?
The price and inventory of LT8636EV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8636EV#PBF is usually 5 days.
3.What payment methods are accepted for LT8636EV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8636EV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8636EV#PBF?
LT8636EV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8636EV#PBF 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 LT8636EV#PBF?
For technical support, including LT8636EV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8636EV#PBF requirements.
6.How does Aetrix verify that LT8636EV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8636EV#PBF 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 LT8636EV#PBF meets industry standards.
7.What is the process for return or replacement of LT8636EV#PBF?
All LT8636EV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8636EV#PBF, 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 LT8636EV#PBF part is unused and in its original packaging.
Return procedure for LT8636EV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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