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Analog Devices Inc. LT8637JV#PBF
- Part No.:
- LT8637JV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TFQFN Exposed Pad
- Datasheet:
-
LT8637JV#PBF.pdf
- Description:
- IC REG BUCK ADJ 5A 20LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:428
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Product details
Overview
LT8637JV#PBF from Analog Devices is a 42V, 5A continuous/7A peak synchronous step-down regulator with Silent Switcher architecture, external compensation for current sharing and fast transient response, and 30ns minimum on-time enabling high step-down ratios at up to 3MHz switching frequency. It operates from –40°C to +150°C junction temperature and delivers <10mVP-P output ripple in automotive power supplies.
For engineers reviewing the LT8637JV#PBF datasheet, LT8637JV#PBF pinout, LT8637JV#PBF application, or LT8637JV#PBF equivalent, key selection criteria include its AEC-Q100 qualification, external VC-loop compensation capability, 230µA quiescent current in Burst Mode (BIAS = 0V), CLKOUT synchronization support, and 20-lead 4mm × 3mm LQFN package with exposed thermal pad.
Technical Context
The LT8637JV#PBF implements peak current mode control with a programmable oscillator (200kHz–3MHz via RT resistor) and supports four operating modes via SYNC/MODE: Burst Mode (ultralow IQ), Forced Continuous Mode (fast transients), Spread Spectrum (±20% frequency modulation), and external clock synchronization. Its VC pin provides direct access to the error amplifier output for custom loop compensation.
Unlike the internally compensated LT8636, the LT8637JV#PBF uses external RC compensation on the VC pin to optimize phase margin and transient response across wide load and input voltage ranges. It features a 1.7mS typical soft-start via TR/SS, ±8% power-good window referenced to FB, and integrated overtemperature protection with thermal shutdown activation above 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports 12V/24V/36V automotive battery rails with cold-crank tolerance down to 3.4V. |
| Output Current | 5A continuous, 7A peak - sustains transient loads without dropout in engine control units and ADAS modules. |
| Quiescent Current | 230µA in Burst Mode (BIAS = 0V) - enables >10-year battery life in always-on vehicle telematics. |
| Switching Frequency | 200kHz to 3MHz (RT-programmable) - allows compact magnetics and EMI filtering while avoiding AM band interference. |
| Min On-Time | 30ns - enables 12V-to-1.0V conversion at 2MHz without pulse-skipping artifacts. |
| Feedback Reference | 0.970V ±0.004V - ensures ±1% output accuracy over temperature and line/load conditions. |
| EMI Performance | CISPR 25 Class 5 compliant with spread spectrum - eliminates need for external EMI filters in infotainment systems. |
Pinout & Package
LT8637JV#PBF uses 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 low when FB deviates >±8% from 0.97V or during UVLO/thermal fault; requires external pull-up. |
| BIAS (2) | Bias Supply Input | Accepts 3.3V–25V to reduce VIN current draw; must be bypassed with 1µF if sourced externally. |
| INTVCC (3) | Internal 3.4V Regulator Bypass | Requires ≥1µF low-ESR ceramic capacitor to ground; powers internal logic and gate drivers. |
| GND (4,13,21) | Ground Return | Multiple GND pins and exposed pad minimize impedance; pad must be soldered for θJC(pad) = 8.0°C/W thermal performance. |
| VIN (6,11) | Main Input Supply | Dual VIN pins reduce trace inductance; require two 1µF ceramic caps placed adjacent to pins plus ≥2.2µF bulk capacitance. |
| BST (7) | Bootstrap Capacitor Node | Drives high-side NMOS gate; requires 0.1µF ceramic cap between BST and SW with minimal loop area. |
| SW (8–10) | Power Switch Output | Three paralleled SW pins reduce conduction loss and EMI; connect directly to inductor with short, wide 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 | Ground = Burst Mode; float = FCM; INTVCC = Spread Spectrum; external clock = Sync - no external components needed. |
| CLKOUT (16) | Switch Frequency Clock Output | 200ns pulses at fSW in FCM/Spread Spectrum/Sync modes; low in Burst Mode; drives other regulators' SYNC pins. |
| RT (17) | Frequency Set Resistor | Resistor to GND programs fSW: 221kΩ = 210kHz, 60.4kΩ = 700kHz, 18.2kΩ = 1.95MHz - enables precise EMI band placement. |
| TR/SS (18) | Soft-Start / Tracking Input | 1.9µA internal current source charges external capacitor; voltage below 1.6V forces FB tracking for sequencing. |
| VC (19) | Error Amplifier Output | Direct access to transconductance amplifier (1.7mS gain); RC network to GND sets loop compensation poles/zeros. |
| FB (20) | Feedback Input | Regulates to 0.970V reference; connects to resistor divider tap; requires 4.7–22pF phase-lead capacitor to VOUT. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher Architecture | Integrated dual-input, dual-output power stage with balanced layout reduces radiated EMI by >30dB vs conventional buck ICs. |
| External VC Compensation | Enables precise loop tuning for multi-phase current sharing and <10µs load transient recovery in ADAS camera modules. |
| AEC-Q100 Grade 1 | Qualified for –40°C to +150°C operation with 100% production testing - meets automotive reliability requirements without derating. |
| CLKOUT Synchronization | Provides jitter-free timing reference to coordinate multiple converters in domain controllers, eliminating beat-frequency noise. |
| Spread Spectrum Modulation | ±20% triangular frequency dithering spreads EMI energy across 200kHz bandwidth - passes CISPR 25 Class 5 without ferrite beads. |
Applications
| Automotive Engine Control Unit (ECU) | ADAS Camera Power Module |
|---|---|
Use Scenario: Supplies 5V/3.3V to microcontrollers, CAN transceivers, and sensors in under-hood ECU environments with 12V/24V battery input and load dump transients. IC Role / Device Role / Timing Role: Primary 42V-input synchronous buck converter delivering regulated 5V at 5A with ultralow EMI to avoid interfering with engine knock sensors. Use Value: 30ns min on-time enables stable 5V output during cold-crank (5.5V input); AEC-Q100 qualification ensures 15-year field reliability. | Use Scenario: Powers image signal processors and high-speed serializers in forward-facing cameras requiring low-noise 1.2V/1.8V rails derived from 12V battery. IC Role / Device Role / Timing Role: Pre-regulator generating clean 5V intermediate rail; external VC compensation enables tight regulation during rapid scene-change transients. Use Value: <10mVP-P ripple prevents image sensor pattern noise; spread spectrum mode eliminates EMI-induced pixel corruption in 1080p video streams. |
| Industrial PLC I/O Module | Electric Vehicle Battery Management System |
Use Scenario: Provides isolated 5V supply for analog front-ends and digital isolators in DIN-rail mounted programmable logic controllers operating from 24VDC industrial bus. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter with forced continuous mode ensuring consistent switching frequency for EMC compliance in factory automation. Use Value: 95% efficiency at 2MHz reduces thermal stress in sealed enclosures; CLKOUT synchronizes with main controller clock to suppress conducted emissions. | Use Scenario: Generates auxiliary 5V rail for MCU, CAN, and cell monitoring ICs in battery packs exposed to wide temperature swings and vibration. IC Role / Device Role / Timing Role: Robust 42V-input buck converter with thermal shutdown and input UVLO protecting against pack overvoltage and deep discharge events. Use Value: –40°C to +150°C operation maintains regulation during thermal runaway tests; exposed pad soldering achieves θJA = 26°C/W on demo board. |
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 |
|---|---|---|---|
| LT8640SJV#PBF | Higher 8A continuous rating, integrated MOSFETs, same 42V input and Silent Switcher architecture but no VC pin. | Lacks external compensation; unsuitable for current-sharing multi-phase designs requiring VC loop control. | Select when higher output current is required and loop compensation can be fixed via internal design. |
| MPQ4333GJ-AEC1-Z | AEC-Q100 qualified 45V/3.5A buck with 2.5µA IQ but no spread spectrum or CLKOUT; uses internal compensation only. | No VC pin or synchronization capability; limited to single-rail applications without timing coordination needs. | Select for cost-sensitive automotive body electronics where EMI filtering is handled externally and multi-rail sync is unnecessary. |
Compared with LT8640SJV#PBF and MPQ4333GJ-AEC1-Z, the LT8637JV#PBF uniquely combines AEC-Q100 qualification, external VC-loop tuning for current sharing, and CLKOUT-based system-level timing coordination - making it optimal for safety-critical multi-converter automotive domains.
Availability
LT8637JV#PBF is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, and industrial PLC I/O systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LT8637JV#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 precision instrumentation, industrial automation, and automotive markets.
The LT8637JV#PBF belongs to the Silent Switcher® family of high-efficiency, low-EMI synchronous step-down regulators designed specifically for demanding automotive and industrial power applications where thermal, noise, and reliability constraints are critical.
FAQ
What is the maximum junction temperature rating for LT8637JV#PBF?
The LT8637JV#PBF is rated for operation from –40°C to +150°C junction temperature and is fully guaranteed over this range per AEC-Q100 Grade 1 requirements. Thermal shutdown activates above 150°C to protect the device during overload conditions, and the exposed thermal pad (Pin 21) must be soldered to PCB copper to achieve the specified θJC(pad) = 8.0°C/W performance.
How does the VC pin on LT8637JV#PBF differ from the FB pin on LT8636JV#PBF?
The VC pin on LT8637JV#PBF provides direct access to the error amplifier output for external RC compensation, enabling precise loop tuning and current sharing in multi-phase configurations. In contrast, the LT8636JV#PBF uses an internal compensation network tied to the FB pin, which regulates to 0.970V but offers no user-adjustable loop dynamics - making LT8637JV#PBF essential for fast transient applications like ADAS camera power.
Can LT8637JV#PBF synchronize to an external clock source?
Yes, the LT8637JV#PBF supports external clock synchronization via the SYNC/MODE pin (Pin 15). When driven by a TTL/CMOS-compatible clock signal, the device locks its switching frequency and phase to the external source while operating in forced continuous mode. This capability allows precise timing coordination across multiple converters in domain controllers, eliminating beat-frequency noise and simplifying EMI filter design.
What is the quiescent current of LT8637JV#PBF in Burst Mode operation?
The LT8637JV#PBF draws 230µA quiescent current in Burst Mode operation when BIAS = 0V and VEN/UV = 2V, as specified over the full –40°C to +150°C temperature range. With BIAS tied to 5V (e.g., VOUT), IQ drops to 19µA, enabling ultra-low standby power in always-on automotive subsystems such as telematics and gateway ECUs.
Does LT8637JV#PBF support spread spectrum modulation, and how is it enabled?
Yes, LT8637JV#PBF supports ±20% triangular spread spectrum modulation to reduce peak EMI emissions. It is enabled by tying the SYNC/MODE pin (Pin 15) to INTVCC (~3.4V) or an external 3V–4V supply, which activates forced continuous mode with frequency dithering. This feature allows the device to meet CISPR 25 Class 5 radiated emission limits without additional EMI filtering components in automotive infotainment systems.
LT8637JV#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)
LT8637JV#PBF FAQ
1.How can I place an order for LT8637JV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8637JV#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 LT8637JV#PBF reliable?
The price and inventory of LT8637JV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8637JV#PBF is usually 5 days.
3.What payment methods are accepted for LT8637JV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8637JV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8637JV#PBF?
LT8637JV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8637JV#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 LT8637JV#PBF?
For technical support, including LT8637JV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8637JV#PBF requirements.
6.How does Aetrix verify that LT8637JV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8637JV#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 LT8637JV#PBF meets industry standards.
7.What is the process for return or replacement of LT8637JV#PBF?
All LT8637JV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8637JV#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 LT8637JV#PBF part is unused and in its original packaging.
Return procedure for LT8637JV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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