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Analog Devices Inc. LT8637EV#WPBF
- Part No.:
- LT8637EV#WPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TFQFN Exposed Pad
- Datasheet:
-
LT8637EV#WPBF.pdf
- Description:
- IC REG BUCK ADJ 5A 20LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:424
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Product details
Overview
LT8637EV#WPBF from Analog Devices is a 42V, 5A continuous/7A peak synchronous step-down regulator with external compensation, Silent Switcher architecture, and 30ns minimum on-time. It delivers up to 96% efficiency at 1MHz (12VIN to 5VOUT) and supports 200kHz–3MHz switching frequency via RT pin. Designed for automotive and industrial power supplies requiring low EMI and fast transient response.
For engineers reviewing the LT8637EV#WPBF datasheet, LT8637EV#WPBF pinout, LT8637EV#WPBF application, or LT8637EV#WPBF equivalent, this page provides verified technical context, package mapping, real-world application cards, and validated alternative parts for high-reliability 5A DC/DC conversion in noise-sensitive environments.
Technical Context
The LT8637EV#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 for fast load transients. Its Silent Switcher architecture integrates dual, matched internal switch paths with integrated input capacitors to suppress common-mode EMI.
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. CLKOUT provides switch-frequency timing pulses for system-level coordination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide automotive battery range including cold-crank and load-dump conditions. |
| Output Current | 5A continuous, 7A peak - sustains short-term surge loads without thermal shutdown under proper PCB layout. |
| Switching Frequency | 200kHz to 3MHz (RT-programmable) - enables compact magnetics and avoids AM radio band with 2MHz+ operation. |
| Min On-Time | 30ns - allows high step-down ratios (e.g., 42V to 3.3V) at 2MHz without pulse-skipping. |
| Quiescent Current | 230µA (BIAS = 0V) / 25µA (BIAS = 5V) in Burst Mode - enables always-on systems with µA-level standby draw. |
| Feedback Reference | 0.970V ±0.004V - ensures tight output regulation accuracy across line, load, and temperature. |
| EMI Performance | CISPR 25 Class 5 compliant with filter - meets automotive radiated emission limits without shielding enclosures. |
Pinout & Package
LT8637EV#WPBF uses a 20-lead 4mm × 3mm × 0.94mm LQFN package with exposed thermal pad (Pin 21 = GND). The package is RoHS-compliant, AEC-Q100 qualified (Grade E, –40°C to +125°C), and compatible with standard QFN reflow profiles (MSL 3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PG (1) | Open-drain Power Good | Asserts high when FB is within ±8% of 0.97V and no fault (UVLO, thermal, INTVCC undervoltage); requires external pull-up. |
| BIAS (2) | Bias Supply Input | Reduces VIN current draw by powering internal circuitry from VOUT (≥3.3V); improves efficiency at high VIN. |
| INTVCC (3) | Internal 3.4V Regulator Bypass | Must be decoupled with ≥1µF ceramic capacitor; supplies gate drivers and control logic. |
| GND (4,13,21) | Ground Return Paths | 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 Power | Dual pins reduce IR drop and high-frequency impedance; require local 1µF + 1µF + ≥2.2µF ceramic bypass network. |
| BST (7) | Bootstrap Supply | Drives high-side NMOS gate; requires 0.1µF ceramic capacitor between BST and SW. |
| SW (8–10) | Power Switch Node | Three paralleled pins minimize inductance and EMI; connect directly to inductor with minimal trace area. |
| 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 Clock Output | 200ns pulse at fSW in FCM/Spread/Sync modes; low in Burst Mode - useful for synchronizing downstream converters. |
| 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 | 1.9µA internal current source charges external capacitor; voltage below 1.6V forces FB tracking for sequencing. |
| VC (19) | Error Amplifier Output | External compensation node - RC network from VC to GND sets loop bandwidth and phase margin. |
| FB (20) | Feedback Input | Regulated to 0.970V; connects to resistor divider tap; requires 4.7–22pF phase-lead capacitor to VOUT. |
Key Features
| Feature | Design Value |
|---|---|
| External Compensation (VC Pin) | Enables precise loop tuning for multi-phase current sharing and <10µs load transient recovery at 5A step. |
| Silent Switcher Architecture | Dual-switch layout with integrated input caps reduces radiated EMI by >30dB vs conventional buck ICs at 100MHz. |
| Spread Spectrum Modulation | ±20% triangular frequency dithering lowers peak EMI amplitude without affecting regulation or efficiency. |
| CLKOUT Synchronization | Allows deterministic timing alignment of multiple regulators to eliminate beat frequencies and simplify EMI filtering. |
| AEC-Q100 Qualified (Grade E) | Validated for automotive applications including infotainment, ADAS cameras, and body control modules. |
Applications
| Automotive Camera Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering 3.3V/5V image sensors and ISP processors in rear-view or surround-view cameras with strict CISPR 25 EMI limits. IC Role / Device Role / Timing Role: Primary 42V-input buck converter delivering regulated 5V@3A with spread spectrum and synchronized CLKOUT to adjacent rails. Use Value: Meets Class 5 radiated EMI limits without ferrite beads or metal shields, reducing BOM cost and board area by 35%. | Use Scenario: Providing isolated 5V/3.3V rails for analog input conditioning, digital I/O, and microcontroller in programmable logic controllers. IC Role / Device Role / Timing Role: High-efficiency, wide-input DC/DC stage converting 24VDC field bus to stable 5V for mixed-signal circuitry. Use Value: 2.5µA quiescent current in Burst Mode extends backup battery life to >1 year during brownout events. |
| Medical Portable Monitor | Railway Signaling Interface |
Use Scenario: Generating clean 3.3V/5V from 12–36V battery packs in handheld diagnostic devices requiring low noise and long runtime. IC Role / Device Role / Timing Role: Main power supply with soft-start tracking to coordinate rail sequencing with FPGA and ADC power-up. Use Value: TR/SS pin enables controlled 5ms ramp rate, eliminating inrush current spikes that trigger battery protection circuits. | Use Scenario: Converting 72V/110V nominal railway supply (with ±40% transients) to 5V for LED indicators, CAN transceivers, and safety logic. IC Role / Device Role / Timing Role: Robust front-end regulator handling 42V max input with 100mV dropout at 1A for reliable operation during voltage sags. Use Value: 7A peak current capability sustains 500ms load surges from solenoid drivers without output collapse. |
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 |
|---|---|---|---|
| LTC3310S-1 | 3.1V–5.5V input, 10A max, integrated MOSFETs, no external compensation - lacks 42V rating and Silent Switcher EMI performance. | Best for low-voltage, high-current point-of-load; unsuitable for automotive battery input or EMI-critical designs. | Select LT8637EV#WPBF when input exceeds 5.5V or CISPR 25 compliance is required. |
| MPQ4420AGL-A | 3.3V–36V input, 2A continuous, no spread spectrum, no CLKOUT, lower efficiency (92% @1MHz) - lacks AEC-Q100 qualification and peak current capability. | Cost-optimized for non-automotive industrial use where EMI and transient response are less critical. | Choose LT8637EV#WPBF for automotive-grade reliability, 5A+ loads, or synchronized multi-rail systems. |
Compared with LTC3310S-1 and MPQ4420AGL-A, the LT8637EV#WPBF uniquely combines 42V input tolerance, AEC-Q100 Grade E qualification, external compensation for current sharing, and certified CISPR 25 Class 5 EMI performance - making it the only option for high-reliability, noise-sensitive 5A automotive and industrial power rails.
Availability
LT8637EV#WPBF is available at Aetrix Electronics and suitable for automotive camera modules, industrial PLCs, medical portable monitors, and railway signaling interfaces requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LT8637EV#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 precision instrumentation, communications, and industrial markets.
The LT8637EV#WPBF belongs to the Silent Switcher® family of high-efficiency, low-EMI DC/DC regulators designed specifically for automotive, industrial, and medical applications where electromagnetic compatibility and reliability are non-negotiable.
FAQ
What is the maximum input voltage rating for the LT8637EV#WPBF?
The LT8637EV#WPBF has an absolute maximum input voltage rating of 42V on VIN, EN/UV, and PG pins. Its operational input range is specified from 3.4V to 42V, enabling direct connection to 12V, 24V, and 36V automotive and industrial bus systems while surviving load-dump transients up to 42V. Exceeding 42V risks permanent damage per Absolute Maximum Ratings.
How does the LT8637EV#WPBF achieve ultralow EMI performance?
The LT8637EV#WPBF achieves ultralow EMI through its patented Silent Switcher architecture: dual, symmetric internal switch paths with integrated input capacitors minimize magnetic field coupling, while the 4mm × 3mm LQFN package's balanced pinout reduces PCB loop area. This design enables CISPR 25 Class 5 compliance without external shielding or complex filters - verified on the DC2918A demo board at 5A output.
Can the LT8637EV#WPBF be used in parallel for higher current output?
Yes, the LT8637EV#WPBF supports current sharing in parallel configurations using its external compensation architecture. By connecting VC pins together and matching RC compensation networks, multiple LT8637EV#WPBF units can share load current within ±5% imbalance. This capability is explicitly enabled by the VC pin interface and confirmed in the datasheet's Applications Information section.
What is the purpose of the BIAS pin on the LT8637EV#WPBF?
The BIAS pin on the LT8637EV#WPBF allows the internal regulator to draw bias current from VOUT (or another ≥3.3V supply) instead of VIN, reducing input supply current and improving efficiency - especially at high input voltages. When BIAS is tied to VOUT, typical quiescent current drops to 25µA in Burst Mode, versus 230µA when BIAS is grounded, as measured in the Electrical Characteristics table.
Does the LT8637EV#WPBF support output voltage tracking during startup?
Yes, the LT8637EV#WPBF supports output voltage tracking via the TR/SS pin. When TR/SS voltage is below 1.6V, the FB pin is regulated to a function of TR/SS voltage (not the fixed 0.97V reference), enabling coordinated power-up sequencing with other rails. An internal 1.9µA current source charges an external capacitor on TR/SS to set the ramp rate - confirmed in the Typical Performance Characteristics plots and Pin Functions description.
LT8637EV#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 ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-LQFN (4x3)
LT8637EV#WPBF FAQ
1.How can I place an order for LT8637EV#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8637EV#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 LT8637EV#WPBF reliable?
The price and inventory of LT8637EV#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8637EV#WPBF is usually 5 days.
3.What payment methods are accepted for LT8637EV#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8637EV#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8637EV#WPBF?
LT8637EV#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8637EV#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 LT8637EV#WPBF?
For technical support, including LT8637EV#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8637EV#WPBF requirements.
6.How does Aetrix verify that LT8637EV#WPBF is sourced from the original manufacturer or authorized distributors?
All LT8637EV#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 LT8637EV#WPBF meets industry standards.
7.What is the process for return or replacement of LT8637EV#WPBF?
All LT8637EV#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8637EV#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 LT8637EV#WPBF part is unused and in its original packaging.
Return procedure for LT8637EV#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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