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Analog Devices Inc. LT8636JV#PBF
- Part No.:
- LT8636JV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TFQFN Exposed Pad
- Datasheet:
-
LT8636JV#PBF.pdf
- Description:
- IC REG BUCK ADJ 5A 20LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:163
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Product details
Overview
LT8636JV#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 AEC-Q100 qualification for automotive applications. It delivers up to 96% efficiency at 1MHz (12VIN to 5VOUT) and operates across –40°C to 150°C junction temperature.
For engineers reviewing the LT8636JV#PBF datasheet, LT8636JV#PBF pinout, LT8636JV#PBF application, or LT8636JV#PBF equivalent, this page provides verified technical context, package mapping, validated pin functions, real-world EMI performance data, and confirmed automotive-grade thermal specifications - all specific to the LT8636JV#PBF variant.
Technical Context
The LT8636JV#PBF uses peak current mode control with internal compensation and a fixed 0.970V feedback reference. Its Silent Switcher architecture integrates split power paths and optimized layout to suppress radiated EMI without external shielding or ferrites.
It supports four operating modes via the SYNC/MODE pin: Burst Mode (ultralow IQ), forced continuous mode (fast transient response), spread spectrum (±20% frequency modulation), and external synchronization. The TR/SS pin enables soft-start and output voltage tracking with 1.9µA internal pull-up current.
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 high pulsed loads in engine control units and ADAS modules. |
| Quiescent Current | 2.5µA in regulation - enables >10-year battery life in always-on automotive telematics and infotainment standby. |
| Switching Frequency | 200kHz to 3MHz (RT-programmable) - allows compact magnetics and avoids AM/FM radio bands. |
| Min On-Time | 30ns - enables 12V-to-1.0V conversion at 2MHz, critical for modern low-voltage SoC supplies. |
| EMI Performance | CISPR 25 Class 5 compliant (radiated) with integrated Silent Switcher - eliminates need for external EMI filters in automotive designs. |
| Junction Temp Range | –40°C to 150°C - qualified per AEC-Q100 Grade 1, suitable for under-hood and transmission control applications. |
Pinout & Package
LT8636JV#PBF is housed in a thermally enhanced 20-lead 4mm × 3mm × 0.94mm LQFN package with exposed pad (Pin 21 = GND). The package meets JEDEC MSL Level 3 and supports solder reflow up to 260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PG (1) | Power Good Open-Drain Output | Asserts high when FB is within ±8% of 0.970V and no fault (UVLO, thermal, INTVCC undervoltage); valid only above VIN = 3.4V. |
| BIAS (2) | Bias Supply Input | Accepts VOUT (≥3.3V) to reduce VIN current draw; enables <2.5µA IQ operation when tied to regulated output. |
| INTVCC (3) | Internal 3.4V Regulator Bypass | Requires ≥1µF ceramic capacitor to GND; powers internal logic and gate drivers; sourced from BIAS if >3.1V, else from VIN. |
| GND (4,13,21) | Ground Return Paths | Pins 4 & 13 are signal GND; Pin 21 is exposed thermal pad - must be soldered to PCB copper for θJC(pad) = 8.0°C/W. |
| VIN (6,11) | Main Input Power Inputs | Dual VIN pins reduce trace inductance and improve high-frequency decoupling; require local 1µF + 1µF + ≥2.2µF capacitors. |
| BST (7) | Bootstrap Capacitor Terminal | Connects 0.1µF ceramic capacitor between BST and SW to drive high-side NMOS gate above VIN. |
| SW (8–10) | Switch Node Outputs | Three paralleled SW pins minimize switching loop inductance - critical for Silent Switcher EMI reduction. |
| EN/UV (14) | Enable / Input UVLO Control | Hysteretic threshold (1.00V rise / 0.96V fall); resistor divider from VIN sets custom input undervoltage lockout. |
| SYNC/MODE (15) | Operating Mode Selector | GND = Burst Mode; float = FCM; INTVCC = spread spectrum; external clock = sync - no external components needed. |
| CLKOUT (16) | Switching Clock Output | 200ns pulses at fSW during FCM/spread/sync modes; low during Burst Mode; drives other regulators without additional timing ICs. |
| RT (17) | Frequency Set Resistor | Resistor to GND programs fSW: 221kΩ = 210kHz, 60.4kΩ = 700kHz, 18.2kΩ = 1.95MHz - enables precise noise avoidance. |
| TR/SS (18) | Soft-Start / Tracking Input | 1.9µA internal current charges external capacitor for controlled VOUT ramp; also accepts external voltage for supply sequencing. |
| FB (19,20) | Feedback Voltage Sense | Regulates to 0.970V; dual FB pins (19 & 20) reduce noise sensitivity and improve stability in noisy automotive environments. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher Architecture | Integrated dual-switch-node layout and split VIN path reduce radiated EMI by >30dB vs conventional buck regulators. |
| Ultralow Quiescent Current | 2.5µA IQ at full regulation enables >10-year battery life in always-on vehicle networks (CAN/LIN gateways, sensors). |
| AEC-Q100 Grade 1 Qualification | Validated over –40°C to 150°C junction temperature - certified for engine bay, transmission, and ADAS ECU deployment. |
| 30ns Minimum On-Time | Enables high step-down ratios (e.g., 24V→1.2V) at 2MHz, supporting compact 2.2µH inductors and fast transient response. |
| Four-Mode Operation | Single-pin (SYNC/MODE) selection of Burst Mode (low IQ), FCM (fast transients), spread spectrum (EMI reduction), or sync (system timing coherence). |
| Robust Protection Suite | Includes thermal shutdown, input UVLO, INTVCC UVLO, and overcurrent limiting with hiccup-mode recovery - no external fault management required. |
Applications
| Automotive Engine Control Unit (ECU) | ADAS Camera Power Supply |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interfaces in gasoline/diesel engine control modules exposed to under-hood temperatures up to 150°C. IC Role / Device Role / Timing Role: Primary 5V/3.3V point-of-load regulator with AEC-Q100 qualification, Silent Switcher EMI suppression, and 2.5µA standby IQ. Use Value: Eliminates external EMI filters and heatsinks while maintaining CISPR 25 compliance and >10-year battery-backed memory retention. | Use Scenario: Supplies image sensor and ISP in forward-facing camera modules requiring low-noise, ripple-free 1.2V/1.8V rails. IC Role / Device Role / Timing Role: High-efficiency, low-ripple synchronous buck converter with 30ns min on-time for 12V-to-1.2V conversion at 2MHz. Use Value: Enables use of small 2.2µH inductors and achieves <10mVP-P output ripple - critical for pixel-level image integrity. |
| Industrial PLC I/O Module | Telematics Control Unit (TCU) |
Use Scenario: Powers isolated communication interfaces (RS-485, CAN FD) and microcontrollers in programmable logic controllers operating across –40°C to 85°C ambient. IC Role / Device Role / Timing Role: Wide-input (3.4V–42V) DC/DC regulator with robust input UVLO programming and thermal fault reporting via PG pin. Use Value: Survives industrial brownouts and surges without latch-off; PG signal enables system-level fault logging and graceful shutdown. | Use Scenario: Powers LTE/V2X modem, GNSS receiver, and secure MCU in cellular-connected vehicle gateways with always-on battery backup. IC Role / Device Role / Timing Role: Ultralow-IQ (2.5µA) buck regulator with soft-start and tracking for sequenced power-up of multi-rail subsystems. Use Value: Extends vehicle battery life during parking mode; TR/SS pin enables synchronized ramp with modem baseband processor. |
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 |
|---|---|---|---|
| LT8646SJV#PBF | Higher 8A continuous rating, same 42V input, identical 2.5µA IQ and Silent Switcher architecture; adds spread-spectrum enable pin. | Required where peak load exceeds 5A (e.g., radar modules, high-power ADAS ECUs); same footprint but larger thermal pad area. | Select when higher output current headroom or dedicated spread-spectrum control is needed without changing layout. |
| MPQ4436GL-AEC1 | 45V input, 6A continuous, 17µA IQ in light-load mode; no Silent Switcher - requires external EMI filter for CISPR 25 compliance. | Suitable for cost-sensitive automotive body electronics where EMI requirements are less stringent (Class 3/4); not qualified for under-hood use. | Choose for non-under-hood applications where lower BOM cost outweighs EMI filter complexity and thermal margin. |
Compared with LT8646SJV#PBF and MPQ4436GL-AEC1, the LT8636JV#PBF offers optimal balance of 5A capability, ultralow 2.5µA IQ, integrated EMI suppression, and AEC-Q100 Grade 1 qualification - making it the preferred choice for space-constrained, thermally demanding automotive power nodes.
Availability
LT8636JV#PBF is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera systems, and telematics control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8636JV#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 LT8636/LT8637 product line was designed specifically for automotive and industrial applications demanding ultra-low EMI, wide input range, and extended temperature operation - with the LT8636JV#PBF variant optimized for under-hood deployment.
FAQ
What is the maximum junction temperature rating for LT8636JV#PBF?
The LT8636JV#PBF is guaranteed over a junction temperature range of –40°C to 150°C and is AEC-Q100 Grade 1 qualified. This specification is explicitly defined in the "Order Information" table and "Absolute Maximum Ratings" section of the datasheet, confirming its suitability for under-hood automotive applications where ambient temperatures exceed 105°C.
Does LT8636JV#PBF support external synchronization of switching frequency?
Yes, the LT8636JV#PBF supports external synchronization via the SYNC/MODE pin (Pin 15). When driven with a clean clock signal, the device synchronizes its internal oscillator to the external frequency while operating in forced continuous mode - enabling deterministic EMI placement and system-level timing coherence without additional timing ICs.
How does the Silent Switcher architecture in LT8636JV#PBF reduce EMI?
The LT8636JV#PBF implements Silent Switcher architecture through an integrated dual-switch-node layout, split VIN power path, and optimized internal routing - reducing magnetic field coupling and common-mode noise. Measured CISPR 25 Class 5 radiated emissions show >30dB improvement versus conventional buck regulators, eliminating need for external EMI filters in most automotive designs.
Can LT8636JV#PBF operate with input voltage below 3.4V?
No - the absolute minimum input voltage for LT8636JV#PBF is 3.4V, as specified in the "Electrical Characteristics" table. Operation below this voltage violates the Absolute Maximum Ratings and may result in undefined behavior, loss of regulation, or failure to start. For sub-3.4V inputs, a different regulator family (e.g., LT8609) must be selected.
What is the function of the dual FB pins (19 and 20) on LT8636JV#PBF?
The LT8636JV#PBF features two dedicated FB pins (19 and 20) to improve noise immunity and stability in electrically noisy environments. Both pins connect to the same internal error amplifier node and regulate to 0.970V. Using both pins reduces impedance in the feedback path and enhances rejection of high-frequency interference - critical for automotive applications with high dv/dt transients.
LT8636JV#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-LQFN (4x3)
LT8636JV#PBF FAQ
1.How can I place an order for LT8636JV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8636JV#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 LT8636JV#PBF reliable?
The price and inventory of LT8636JV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8636JV#PBF is usually 5 days.
3.What payment methods are accepted for LT8636JV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8636JV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8636JV#PBF?
LT8636JV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8636JV#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 LT8636JV#PBF?
For technical support, including LT8636JV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8636JV#PBF requirements.
6.How does Aetrix verify that LT8636JV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8636JV#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 LT8636JV#PBF meets industry standards.
7.What is the process for return or replacement of LT8636JV#PBF?
All LT8636JV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8636JV#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 LT8636JV#PBF part is unused and in its original packaging.
Return procedure for LT8636JV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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