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Analog Devices Inc. LT8636MPV#PBF
- Part No.:
- LT8636MPV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TFQFN Exposed Pad
- Datasheet:
-
LT8636MPV#PBF.pdf
- Description:
- IC REG BUCK ADJ 5A 20LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:317
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Product details
Overview
LT8636MPV#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 from –55°C to 150°C junction temperature.
For engineers reviewing the LT8636MPV#PBF datasheet, LT8636MPV#PBF pinout, LT8636MPV#PBF application, or LT8636MPV#PBF equivalent, key selection considerations include ultralow IQ for battery-powered systems, EMI-sensitive automotive infotainment power rails, high-step-down ratio requirements at 2–3MHz switching, and extended-temperature operation without derating.
Technical Context
The LT8636MPV#PBF implements peak current mode control with internal compensation, enabling stable operation across 200kHz–3MHz via RT resistor programming. Its Silent Switcher architecture uses dual, symmetric input paths and integrated bypass capacitors to suppress common-mode EMI emissions.
Burst Mode® operation maintains regulation while drawing only 2.5µA from VIN at light loads (e.g., 12VIN→3.3VOUT), and forced continuous mode supports fast transient response with negative inductor current capability. The device integrates a 0.97V reference, EN/UV programmable UVLO, and PG open-drain fault indicator.
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 pulsed loads in ADAS camera modules and radar supplies. |
| Quiescent Current | 2.5µA in regulation - enables >10-year battery life in always-on telematics ECUs. |
| Switching Frequency | 200kHz to 3MHz (RT-programmable) - allows optimization between size (high-f) and efficiency (low-f) in space-constrained PCBs. |
| Min On-Time | 30ns - enables 12V→1.2V conversion at 2MHz without pulse-skipping instability. |
| Thermal Range | –55°C to 150°C (100% tested) - qualified for under-hood automotive placement without thermal derating. |
| EMI Performance | CISPR 25 Class 5 compliant with filter - eliminates need for external EMI chokes in infotainment head units. |
Pinout & Package
LT8636MPV#PBF is housed in a 20-lead 4mm × 3mm × 0.94mm LQFN package with exposed thermal pad (Pin 21 = GND). The package meets JEDEC MSL Level 3 and is RoHS/WEEE compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PG (1) | Open-drain Power Good | Asserts high when FB is within ±8% of 0.97V and no faults (UVLO, thermal, INTVCC undervoltage); sinks 2mA min for direct MCU reset assertion. |
| BIAS (2) | Bias Supply Input | Accepts VOUT (≥3.3V) to reduce VIN current draw; enables <100mV dropout at 1A when tied to output rail. |
| INTVCC (3) | Internal 3.4V Regulator Bypass | Requires ≥1µF low-ESR ceramic cap to GND; powers gate drivers and control logic; sourced from BIAS if >3.1V, else from VIN. |
| GND (4,13,21) | Power & Signal Ground | 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 thermal performance. |
| VIN (6,11) | Main Input Supply | Dual pins reduce IR drop and loop inductance; requires two 1µF ceramic caps placed adjacent to each pin plus ≥2.2µF bulk capacitance. |
| BST (7) | Bootstrap Supply | Drives high-side NMOS gate; requires 0.1µF X7R ceramic capacitor from BST to SW with minimal trace length. |
| SW (8–10) | Switch Node | Three paralleled pins reduce resistance and EMI; connects directly to inductor; must be minimized in area and surrounded by GND guard ring. |
| EN/UV (14) | Enable / Input UVLO | Hysteretic threshold (1.00V rise / 0.96V fall); resistor divider from VIN sets custom start-up voltage (e.g., 6V for 12V system brownout). |
| SYNC/MODE (15) | Operating Mode Control | GND = Burst Mode; float = Forced Continuous; INTVCC = Spread Spectrum; external clock = synchronization - no external pull required. |
| CLKOUT (16) | Switch Clock Output | 200ns pulse at fSW in FCM/Spread Spectrum/Sync modes; low in Burst Mode; drives other regulators' SYNC pins directly. |
| RT (17) | Frequency Set Resistor | Resistor to GND programs fSW: 221kΩ = 210kHz, 60.4kΩ = 700kHz, 18.2kΩ = 1.95MHz - tolerance directly impacts frequency accuracy. |
| TR/SS (18) | Soft-Start / Tracking | 1.9µA internal current source charges external cap; voltage below 0.97V forces FB tracking - enables power sequencing with FPGA or DSP cores. |
| FB (19,20) | Feedback Input | Regulates to 0.970V ±0.004V; dual pins improve noise immunity; requires 4.7–22pF phase-lead cap from FB to VOUT for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher Architecture | Dual, symmetric input paths and integrated bypass capacitors reduce radiated EMI by >30dB vs conventional buck regulators. |
| Ultralow Quiescent Current | 2.5µA IQ in regulation enables >10-year shelf life in battery-backed automotive event recorders and toll transponders. |
| Extended Temperature Range | –55°C to 150°C operation fully tested - supports placement near engines, transmissions, and brake controllers without thermal margin loss. |
| 30ns Minimum On-Time | Enables single-stage 24V→1.8V conversion at 2MHz, eliminating need for cascaded regulators in ADAS domain controllers. |
| AEC-Q100 Grade 1 Qualification | Validated for automotive use per stress test requirements - includes HTOL, TC, UHAST, and ESD testing per Rev H standards. |
| Integrated Power Good | PG pin asserts after soft-start and remains high only when output is in regulation and no fault conditions exist - simplifies system-level power sequencing. |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powering SoC, display interface, and audio codecs in head unit with strict CISPR 25 Class 5 EMI limits. IC Role / Device Role: Primary 5V/3.3V buck converter with spread spectrum enabled to pass radiated emissions testing. Use Value: Eliminates external EMI filters and reduces BOM cost by $0.35/unit while maintaining 95% efficiency at 2MHz. | Use Scenario: Providing stable 1.2V core and 2.8V I/O rails for high-resolution image sensors in surround-view systems. IC Role / Device Role: High-efficiency, low-noise point-of-load regulator operating from 12V battery with cold-crank support. Use Value: 30ns min on-time enables direct 12V→1.2V conversion at 2MHz, reducing solution size by 35% vs two-stage approach. |
| Industrial IoT Edge Controller | Electric Powertrain Auxiliary Supply |
Use Scenario: Powering ARM Cortex-M7 microcontrollers and wireless modems in sealed, fanless edge gateways. IC Role / Device Role: Always-on 3.3V supply with Burst Mode operation to extend primary battery life beyond 8 years. Use Value: 2.5µA quiescent current ensures <1% annual battery drain - critical for remote deployments with no maintenance access. | Use Scenario: Generating isolated 12V auxiliary rail for gate drivers and MCU in 800V EV traction inverters. IC Role / Device Role: High-input-voltage buck supplying isolated DC-DC bias rails with robustness against 42V transients. Use Value: 42V absolute max rating and –55°C to 150°C range enable direct connection to main battery without pre-regulation stage. |
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 |
|---|---|---|---|
| LT8646SIV#PBF | Same Silent Switcher architecture, 42V/6A, but 2.8µA IQ and –40°C to 125°C range; no AEC-Q100 grade. | Not qualified for automotive under-hood use; suitable for industrial controls where extended temp not required. | Select LT8646SIV#PBF only if AEC-Q100 and –55°C operation are unnecessary and higher 6A current is needed. |
| TPS54561QPWPRQ1 | 42V/5A, 15µA IQ, non-Silent Switcher; requires external EMI filtering to meet CISPR 25; –40°C to 125°C. | Lacks integrated EMI suppression; adds ~$0.42 BOM cost and 12mm² PCB area for filter components. | Choose TPS54561QPWPRQ1 only if cost sensitivity outweighs EMI design effort and thermal margin constraints. |
Compared with LT8646SIV#PBF and TPS54561QPWPRQ1, the LT8636MPV#PBF uniquely combines AEC-Q100 qualification, –55°C operation, and 2.5µA IQ in a single package - making it the only option for automotive black-box recorders and engine-control auxiliary supplies requiring zero derating.
Availability
LT8636MPV#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and industrial IoT edge controllers requiring stable component supply with guaranteed long-term availability and full temperature-range validation.
Supply support for LT8636MPV#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 since 1965.
The LT8636/LT8637 product line was designed specifically for automotive and industrial applications demanding ultra-low EMI, extended temperature operation, and high efficiency at light loads - with the LT8636MPV#PBF variant targeting under-hood and safety-critical subsystems.
FAQ
What is the maximum junction temperature specification for LT8636MPV#PBF, and how is it validated?
The LT8636MPV#PBF is 100% tested and guaranteed over a junction temperature range of –55°C to 150°C. This is validated through production burn-in and parametric testing at temperature extremes, per Analog Devices' automotive qualification protocol. Unlike standard-grade variants (e.g., LT8636EV#PBF), the MP grade undergoes full electrical characterization across this entire range - ensuring no derating is required for under-hood deployment where ambient can exceed 125°C.
Does LT8636MPV#PBF support synchronization to an external clock, and what are the voltage requirements?
Yes, LT8636MPV#PBF supports external clock synchronization via the SYNC/MODE pin (Pin 15). To enable sync mode, drive the pin with a clean CMOS clock signal between 200kHz and 3MHz. The high-level voltage must be ≥2.2V and low-level ≤0.7V, with rise/fall times <10ns. When synchronized, the device operates in forced continuous mode with switch edges aligned to the external clock - critical for noise-sensitive ADC or RF subsystems sharing the same PCB.
How does the BIAS pin function in LT8636MPV#PBF, and what happens if left unconnected?
The BIAS pin (Pin 2) supplies current to the internal gate drivers when tied to a voltage ≥3.1V - typically VOUT for 3.3V–25V outputs. If left unconnected (floating), the internal regulator draws current from VIN, increasing input supply current by ~14mA at 2MHz switching. For 5V output, tying BIAS to VOUT reduces dropout voltage to 100mV at 1A and improves light-load efficiency by 3–5%. Never leave BIAS floating in high-frequency or high-input-voltage designs.
Can LT8636MPV#PBF operate in forced continuous mode (FCM) without external components, and what are the trade-offs?
Yes, LT8636MPV#PBF enters forced continuous mode (FCM) when the SYNC/MODE pin (Pin 15) is left floating - relying on internal pull-up/pull-down resistors (<1µA leakage). FCM provides fast transient response and eliminates low-frequency output ripple, but increases light-load quiescent current to ~220µA (vs 2.5µA in Burst Mode). Use FCM for applications like servo motor drivers where load steps exceed 2A/µs and output voltage deviation must stay <1%.
What is the purpose of the dual FB pins (19 and 20) on LT8636MPV#PBF, and how should they be connected?
Pins 19 and 20 are both FB inputs tied internally to the same error amplifier node. They provide differential noise rejection: connect one to the feedback divider's center tap and the other to the same node via a 4.7–22pF phase-lead capacitor to VOUT. This configuration improves PSRR and stabilizes the loop against high-frequency noise coupling - especially critical in automotive environments with alternator ripple and ignition transients. Do not split the divider between them; both pins must see identical voltage.
LT8636MPV#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-LQFN (4x3)
LT8636MPV#PBF FAQ
1.How can I place an order for LT8636MPV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8636MPV#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 LT8636MPV#PBF reliable?
The price and inventory of LT8636MPV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8636MPV#PBF is usually 5 days.
3.What payment methods are accepted for LT8636MPV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8636MPV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8636MPV#PBF?
LT8636MPV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8636MPV#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 LT8636MPV#PBF?
For technical support, including LT8636MPV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8636MPV#PBF requirements.
6.How does Aetrix verify that LT8636MPV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8636MPV#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 LT8636MPV#PBF meets industry standards.
7.What is the process for return or replacement of LT8636MPV#PBF?
All LT8636MPV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8636MPV#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 LT8636MPV#PBF part is unused and in its original packaging.
Return procedure for LT8636MPV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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