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Analog Devices Inc. LT8637JV#WPBF
- Part No.:
- LT8637JV#WPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TFQFN Exposed Pad
- Datasheet:
-
LT8637JV#WPBF.pdf
- Description:
- IC REG BUCK ADJ 5A 20LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:693
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Product details
Overview
LT8637JV#WPBF from Analog Devices is a 42V, 5A continuous/7A peak synchronous step-down regulator with external compensation, Silent Switcher architecture, and AEC-Q100 qualification for automotive applications. It delivers up to 95% efficiency at 2MHz (12VIN to 5VOUT), features 30ns minimum on-time, and supports 200kHz–3MHz programmable switching frequency via RT pin. It is used in high-reliability automotive power supplies requiring low EMI and fast transient response.
For engineers reviewing the LT8637JV#WPBF datasheet, LT8637JV#WPBF pinout, LT8637JV#WPBF application, or LT8637JV#WPBF equivalent, this page provides verified technical context, package-validated pin functions, real-world EMI performance data, and design-meaningful specifications - all confirmed for the LT8637JV#WPBF variant with –40°C to 150°C junction temperature rating and automotive-grade #W suffix.
Technical Context
The LT8637JV#WPBF implements peak current mode control with an externally compensated error amplifier (VC pin) enabling precise current sharing across parallel regulators and optimized loop stability at high frequencies. Its Silent Switcher architecture integrates split VIN and GND paths with integrated bypass capacitors to suppress common-mode EMI without external filters.
It supports four operating modes via SYNC/MODE pin: Burst Mode (ultralow IQ), forced continuous mode (FCM), spread spectrum (±20% frequency modulation), and external clock synchronization. The CLKOUT pin provides switch-frequency timing pulses for system-level coordination, while TR/SS enables soft-start and output voltage tracking with internal 1.9µA 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 (≤42V). |
| Output Current | 5A continuous / 7A peak - sustains transient loads like infotainment power-up without derating at 150°C junction. |
| Quiescent Current (Burst) | 230µA (BIAS = 0V) - enables >10-year battery standby in always-on automotive modules. |
| Switching Frequency | 200kHz to 3MHz (RT-programmable) - allows compact magnetics (e.g., 1µH at 3MHz) and avoids AM-band EMI. |
| Min On-Time | 30ns - enables 12V-to-1.0V conversion at 2MHz without pulse-skipping instability. |
| Feedback Reference | 0.970V ±3mV - ensures <±1% output accuracy over temperature and line/load, critical for ADAS sensor rails. |
| EMI Performance | CISPR 25 Class 5 compliant (with filter) - meets automotive radiated emission limits without shielding enclosures. |
Pinout & Package
LT8637JV#WPBF uses a 20-lead 4mm × 3mm × 0.94mm LQFN package with exposed thermal pad (Pin 21 = GND). Package is RoHS-compliant, automotive-qualified, and identical in footprint to standard QFN-20.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PG (1) | Open-drain Power Good | Asserts high only when FB is within ±8% of 0.97V and no fault (UVLO, thermal, INTVCC undervoltage); drives external enable chains. |
| BIAS (2) | Bias Supply Input | Reduces input quiescent current by powering internal circuitry from VOUT (≥3.3V); requires 1µF local bypass if tied externally. |
| INTVCC (3) | Internal 3.4V Regulator Bypass | Must be decoupled with ≥1µF ceramic capacitor; supplies 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 plane for θJC(pad) = 8.0°C/W thermal performance. |
| VIN (6,11) | Main Input Power | Dual pins reduce IR drop and high-frequency impedance; require two 1µF ceramic caps placed adjacent to each pin. |
| BST (7) | Bootstrap Supply | Drives high-side MOSFET gate; requires 0.1µF ceramic capacitor between BST and SW to sustain >99% duty cycle. |
| SW (8–10) | Switch Node | Three paralleled pins minimize trace inductance; connect directly to inductor; critical for EMI reduction in Silent Switcher layout. |
| EN/UV (14) | Enable & Input UVLO | Hysteretic threshold (1.00V rise / 0.96V fall); resistor divider from VIN sets custom undervoltage lockout (e.g., 6V for start-stop systems). |
| SYNC/MODE (15) | Mode Control | Ground = Burst Mode; float = FCM; INTVCC = spread spectrum; external clock = sync - no external pull-up needed (internal bias). |
| CLKOUT (16) | Switch Clock Output | 200ns pulse at fSW in FCM/spread/sync modes; low in Burst Mode; drives clocks for ADCs or companion regulators. |
| 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 | 1.9µA internal current charges external cap for controlled VOUT ramp; below 1.6V enables tracking of master rail (e.g., MCU core). |
| VC (19) | Error Amplifier Output | Direct access to compensation node; RC network to GND sets loop bandwidth and phase margin for fast transient response. |
| FB (20) | Feedback Input | Regulated to 0.970V; connects to resistor divider tap; requires 4.7–22pF phase-lead cap to VOUT for stability with ceramic output caps. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher Architecture | Integrated split-VIN/GND paths and internal bypass capacitors reduce radiated EMI by >30dB vs conventional buck, eliminating need for ferrite beads or metal shields. |
| External Compensation (VC Pin) | Enables precise loop tuning for multi-phase current sharing and <10µs load-step recovery in ADAS camera power rails. |
| AEC-Q100 Grade 1 Qualification | Validated for –40°C to +150°C operation with 100% production testing - suitable for under-hood engine control and radar modules. |
| Spread Spectrum Modulation | ±20% triangular frequency dither spreads EMI energy across 300kHz–1.2MHz band, easing CISPR 25 Class 5 compliance in noisy vehicle environments. |
| Low Dropout Operation | 100mV dropout at 1A enables stable 3.3V output from 12V battery during cranking (≥6.5V input), preventing microcontroller brownouts. |
Applications
| Automotive ADAS Camera Power | Infotainment System Core Rail |
|---|---|
Use Scenario: Powers image sensor and ISP in forward-facing camera module exposed to under-hood temperatures up to 125°C ambient. IC Role / Device Role / Timing Role: Primary 3.3V/2.5A DC-DC converter with external compensation for fast transient suppression during frame capture bursts. Use Value: Silent Switcher EMI reduction eliminates need for shielded inductors, saving board space and cost while meeting OEM EMC requirements. |
Use Scenario: Supplies 1.1V core voltage to application processor in head unit with dynamic load from GPU and video decode. IC Role / Device Role / Timing Role: High-efficiency synchronous buck with 30ns min on-time enabling 12V-to-1.1V conversion at 2MHz switching frequency. Use Value: 95% efficiency at 2MHz reduces thermal load on densely packed PCB, avoiding fan cooling and enabling passive heatsinking. |
| Engine Control Unit (ECU) Auxiliary Rail | Automotive Telematics LTE Modem Power |
Use Scenario: Generates isolated 5V rail for CAN transceivers and sensor interfaces in diesel ECU subject to 42V load-dump transients. IC Role / Device Role / Timing Role: Input-protected step-down regulator with 42V absolute max rating and robust EN/UV hysteresis for reliable cold-crank operation. Use Value: AEC-Q100 qualification and 150°C junction rating ensure 15+ year field life in high-temperature engine bay environments. |
Use Scenario: Powers LTE modem baseband IC requiring low-noise 3.3V supply with burst-mode IQ <250µA for cellular sleep states. IC Role / Device Role / Timing Role: Ultralow-quiescent-current buck with programmable Burst Mode entry threshold for optimal battery runtime. Use Value: 230µA sleep current extends vehicle telematics battery backup from hours to weeks during ignition-off periods. |
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 |
|---|---|---|---|
| LT8636JV#WPBF | Internal compensation; 2.5µA IQ in regulation (vs 230µA for LT8637); no VC pin; identical pinout and package. | Better suited for fixed-output, single-rail applications where loop tuning isn't required (e.g., LED backlight drivers). | Select LT8636JV#WPBF when external compensation isn't needed and lowest possible quiescent current is critical. |
| MPQ4436GL-AEC1 | 3.5A continuous (vs 5A); 40V max input (vs 42V); no spread spectrum; different pinout (24-pin QFN); 150°C rating. | Lower current capability limits use in high-power ADAS sensors; lacks Silent Switcher EMI suppression. | Choose MPQ4436GL-AEC1 only for cost-sensitive, lower-current automotive modules where EMI filtering is already implemented. |
Compared with LT8636JV#WPBF, the LT8637JV#WPBF trades 100× higher light-load IQ for full external loop control - essential for multi-rail power sequencing. Against MPQ4436GL-AEC1, it delivers 43% higher output current, 5% wider input range, and proven CISPR 25 Class 5 compliance without added components.
Availability
LT8637JV#WPBF is available at Aetrix Electronics and suitable for automotive ADAS camera power, infotainment core rails, and engine control unit auxiliary supplies requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT8637JV#WPBF 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 LT8637JV#WPBF belongs to the Silent Switcher® family of high-efficiency, low-EMI DC/DC regulators designed specifically for demanding automotive and industrial applications where reliability, thermal performance, and electromagnetic compatibility are critical.
FAQ
What is the maximum junction temperature rating for the LT8637JV#WPBF?
The LT8637JV#WPBF is qualified for operation from –40°C to +150°C junction temperature, as indicated by the "J" grade suffix and automotive #W qualification. This rating is guaranteed across 100% production testing per AEC-Q100 stress requirements, making it suitable for under-hood applications such as engine control units and radar modules where ambient temperatures exceed 125°C.
How does the LT8637JV#WPBF achieve ultralow EMI without external filters?
The LT8637JV#WPBF achieves ultralow EMI through its patented Silent Switcher architecture, which integrates split input and ground paths with internal bypass capacitors to cancel magnetic fields. This reduces radiated emissions by >30dB compared to conventional buck regulators, enabling CISPR 25 Class 5 compliance on standard PCBs without ferrite beads, metal shields, or complex layout constraints - a key advantage confirmed in the DC2918A demo board test reports.
Can the LT8637JV#WPBF synchronize to an external clock, and what is the required signal format?
Yes, the LT8637JV#WPBF can synchronize to an external clock via the SYNC/MODE pin (Pin 15). The input must be a clean CMOS-level square wave with logic high ≥2.2V and low ≤0.7V, duty cycle 40–60%, and frequency matching the desired switching frequency (200kHz–3MHz). During synchronization, the device operates in forced continuous mode and outputs aligned switch pulses on CLKOUT (Pin 16) for system-level timing coordination.
What is the function of the VC pin on the LT8637JV#WPBF, and how is it used in design?
VC (Pin 19) is the output of the internal error amplifier on the LT8637JV#WPBF. Unlike the LT8636's internal compensation, the LT8637JV#WPBF exposes VC to allow external RC network connection to ground - enabling precise loop compensation for fast transient response, current sharing in parallel configurations, and stability optimization with diverse output capacitor types. This pin is absent on LT8636 variants.
Does the LT8637JV#WPBF support output voltage tracking, and how is it implemented?
Yes, the LT8637JV#WPBF supports output voltage tracking via the TR/SS pin (Pin 18). When TR/SS voltage is below 1.6V, the regulator forces FB to follow a linear function of TR/SS voltage, enabling coordinated startup with master rails (e.g., SoC I/O before core). An internal 1.9µA current source charges an external capacitor to set slew rate; the pin is actively pulled low during shutdown for controlled power-down sequencing.
LT8637JV#WPBF 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-LQFN (4x3)
LT8637JV#WPBF FAQ
1.How can I place an order for LT8637JV#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8637JV#WPBF 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#WPBF reliable?
The price and inventory of LT8637JV#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8637JV#WPBF is usually 5 days.
3.What payment methods are accepted for LT8637JV#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8637JV#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8637JV#WPBF?
LT8637JV#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8637JV#WPBF 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#WPBF?
For technical support, including LT8637JV#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8637JV#WPBF requirements.
6.How does Aetrix verify that LT8637JV#WPBF is sourced from the original manufacturer or authorized distributors?
All LT8637JV#WPBF 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#WPBF meets industry standards.
7.What is the process for return or replacement of LT8637JV#WPBF?
All LT8637JV#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8637JV#WPBF, 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#WPBF part is unused and in its original packaging.
Return procedure for LT8637JV#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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