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Analog Devices Inc. LT8692SIV#PBF
- Part No.:
- LT8692SIV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TFQFN Exposed Pad
- Datasheet:
-
LT8692SIV#PBF.pdf
- Description:
- IC REG BUCK ADJ QUAD 20LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:614
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Product details
Overview
LT8692SIV#PBF from Analog Devices is a quad-channel monolithic synchronous step-down regulator featuring one 42V/2A high-voltage channel and three 8V/1A low-voltage channels, all synchronized to a fixed 2MHz oscillator. It integrates bypass capacitors for Silent Switcher® 2 EMI reduction, delivers <10mVPk-Pk output ripple, supports Burst Mode® (9.6μA IQ), and is AEC-Q100 qualified for automotive camera modules and infotainment systems.
For engineers reviewing the LT8692SIV#PBF datasheet, LT8692SIV#PBF pinout, LT8692SIV#PBF application, or LT8692SIV#PBF equivalent, key selection criteria include input voltage range partitioning (VIN1: 3–42V vs. VIN234: 1.2–8V), per-channel enable thresholds (0.68V), integrated boost capacitors, PG open-drain logic with ±7.5% regulation window, and thermal derating above 125°C junction temperature.
Technical Context
The LT8692SIV#PBF implements current-mode control across four independent buck regulators sharing a single 2MHz oscillator. Channel 1 uses a dedicated VIN1 input and BST1 boost capacitor, while Channels 2–4 share VIN234 and integrate internal driver capacitors - enabling compact layout and reduced external component count.
Its Silent Switcher® 2 architecture embeds ceramic bypass capacitors for VIN1, VIN234, INTVCC, and BST nodes, minimizing high-di/dt loop area to achieve CISPR 25 Class 5 radiated emissions compliance without external filters. Spread spectrum modulation (enabled via SYNC pin) further suppresses peak EMI by ±10% frequency dithering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | VIN1: 3V–42V; VIN234: 1.2V–8V - enables cascaded power tree where CH1 powers CH2–CH4 |
| Output Current Capability | CH1: up to 2A continuous; CH2–CH4: up to 1A each - supports multi-rail SoC or sensor subsystems |
| Switching Frequency | Fixed 2MHz (±10% tolerance); externally synchronizable from 1.6MHz–2.5MHz - ensures predictable EMI placement and avoids AM band |
| Quiescent Current | 9.6μA in Burst Mode® with all channels regulating - extends battery runtime in always-on automotive modules |
| Feedback Reference Voltage | 0.800V ±10mV over –40°C to 125°C - enables precise output programming with standard resistor dividers |
| Power Good Accuracy | ±7.5% window around VFB - provides reliable rail sequencing and fault detection without external comparators |
| EMI Performance | CISPR 25 Class 5 compliant with integrated capacitors and spread spectrum - eliminates need for ferrite beads or metal shields in most layouts |
Pinout & Package
LT8692SIV#PBF is housed in a thermally enhanced 4mm × 3mm × 0.94mm 20-lead LQFN package with exposed pad (Pin 21) soldered to PCB ground for optimal thermal and electrical performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 (Pin 1) | High-voltage input supply | Primary power source for CH1; must be decoupled with ≥1µF low-ESR capacitor near GND |
| EN/UVLO (Pin 2) | Global enable / programmable UVLO | Hysteretic threshold (0.74V↓/0.76V↑); enables system-level input undervoltage lockout via resistor divider |
| EN1 (Pin 3) | Channel 1 enable | 0.68V threshold allows per-rail sequencing or disable; tie to GND if unused |
| EN4–EN2 (Pins 4–6) | Channels 4–2 enable inputs | Independent 0.68V thresholds support flexible power-up sequencing (e.g., EN2 tied to FB1 for post-regulation turn-on) |
| FB1–FB4 (Pins 7–10) | Output voltage feedback inputs | Each regulates to 0.800V reference; connect resistor dividers to set VOUT (e.g., 5V, 3.3V, 1.8V, 1.2V) |
| INTVCC (Pin 11) | Internal regulator bypass | Supplies internal circuitry; sourced from VIN234 if >3.1V, else from VIN1 - minimizes CH1 quiescent draw |
| SYNC (Pin 12) | External clock/synchronization | Ground = Burst Mode®; float = FCM; >2.8V = FCM + spread spectrum; 1.6–2.5MHz clock = sync mode |
| SW4–SW2 (Pins 13–15) | Low-voltage channel switch nodes | Connect directly to respective inductors; short PCB traces critical for EMI and efficiency |
| VIN234 (Pin 16) | Shared input for CH2–CH4 | Typically connected to CH1 output (e.g., 5V rail); requires ≥1µF local decoupling |
| SW1 (Pin 17) | High-voltage channel switch node | Main switching output for CH1; demands shortest possible trace to inductor and low-inductance GND return |
| BST1 (Pin 18) | CH1 bootstrap capacitor connection | Optional 0.22µF capacitor between BST1 and SW1 improves top-FET gate drive during high-duty-cycle operation |
| PG (Pin 19) | Power good open-drain output | Pulled low if any enabled channel's FB is outside ±7.5% of 0.8V or during UVLO/thermal shutdown |
| GND (Exposed Pad, Pin 20) | System ground and thermal path | Mandatory solder connection to large PCB copper pour for thermal dissipation and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® 2 architecture | Integrated ceramic bypass capacitors on die reduce high-frequency loop area, enabling Class 5 CISPR 25 compliance without external EMI filters |
| Quad-channel synchronization | Single 2MHz oscillator drives all four regulators, eliminating beat frequencies and simplifying EMI filtering |
| Burst Mode® with ultralow IQ | 9.6μA total input current at no load preserves battery life in always-on automotive subsystems |
| Per-channel enable and sequencing | Four independent EN pins (0.68V threshold) allow precise power-up/down ordering for SoCs and FPGAs |
| AEC-Q100 Grade 1 qualification | Rated for –40°C to +125°C junction temperature - validated for under-hood automotive applications including ADAS cameras |
| Integrated boost capacitors | BST1 capacitor integrated for CH1; internal capacitors for VIN234 and INTVCC eliminate 4 external components and reduce layout sensitivity |
Applications
| Automotive Camera Modules | Infotainment Power Management |
|---|---|
Use Scenario: Dual-sensor ADAS camera requiring 5V, 3.3V, 1.8V, and 1.2V rails from a 12V vehicle battery with strict EMI limits. IC Role / Device Role / Timing Role: Quad-output DC/DC regulator providing sequenced, low-noise power with integrated EMI suppression. Use Value: Eliminates discrete filter components and meets CISPR 25 Class 5 without shielding, reducing BOM cost and board area by >30%. |
Use Scenario: In-vehicle display unit needing stable 5V, 3.3V, and 1.8V supplies for processor, memory, and interface ICs amid engine cranking transients. IC Role / Device Role / Timing Role: Cascaded buck regulator where CH1 (42V tolerant) handles wide-input battery variations, feeding CH2–CH4 for clean low-voltage rails. Use Value: 3V–42V VIN1 range maintains regulation during cold-crank (down to 3.3V) and load-dump (up to 42V), ensuring system uptime. |
| Industrial Vision Systems | Medical Imaging Sensors |
Use Scenario: Compact machine vision camera operating from 24V industrial bus, requiring isolated 5V, 3.3V, 1.8V outputs with minimal conducted emissions. IC Role / Device Role / Timing Role: Single-chip quad regulator replacing four discrete converters, synchronized to avoid interference with image sensor clocks. Use Value: 2MHz fixed frequency places switching harmonics above sensitive video bandwidths; spread spectrum further reduces spectral peaks. |
Use Scenario: Portable ultrasound probe requiring ultra-low-noise, low-quiescent-power 3.3V and 1.8V supplies for analog front-end and digital processing. IC Role / Device Role / Timing Role: Low-ripple regulator delivering <10mVPk-Pk output noise in Burst Mode® to preserve signal integrity in analog signal chains. Use Value: 9.6μA IQ extends battery life in handheld devices; integrated capacitors prevent layout-induced noise coupling into sensitive analog sections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8645SIV#PBF | Single-channel 42V/8A Silent Switcher® 2 buck; no CH2–CH4 integration | Requires three additional regulators for quad-rail systems; higher solution size and BOM count | Select when higher current per rail (>2A) or independent frequency control is needed |
| TPS6521905RGER | Quad-channel buck (3× 3A + 1× 2A), but 2.2MHz max fSW, no integrated capacitors, non-AEC-Q100 | Lacks Silent Switcher® EMI performance; requires external filters for automotive EMC; not qualified for automotive use | Select for cost-sensitive industrial applications where EMI filtering is acceptable and AEC-Q100 is not required |
Compared with LT8645SIV#PBF and TPS6521905RGER, the LT8692SIV#PBF uniquely combines quad-channel integration, AEC-Q100 qualification, and embedded capacitors - delivering smallest footprint and lowest EMI risk for automotive multi-rail designs without compromising reliability or regulatory compliance.
Availability
LT8692SIV#PBF is available at Aetrix Electronics and suitable for automotive camera modules, infotainment systems, and industrial vision equipment requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT8692SIV#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and automotive markets.
The LT8692SIV#PBF belongs to Analog Devices' Silent Switcher® 2 power management product line, engineered specifically for noise-sensitive automotive and industrial applications demanding ultra-low EMI, high efficiency, and AEC-Q100 reliability.
FAQ
What is the maximum input voltage rating for LT8692SIV#PBF Channel 1?
The LT8692SIV#PBF Channel 1 (VIN1 pin) has an absolute maximum rating of 42V and operates continuously from 3V to 42V. This wide range supports automotive battery applications including cold-crank (down to ~3.3V) and load-dump (up to 42V). Exceeding 42V risks permanent damage per Absolute Maximum Ratings.
How does LT8692SIV#PBF achieve CISPR 25 Class 5 radiated emissions compliance?
The LT8692SIV#PBF achieves CISPR 25 Class 5 compliance through Silent Switcher® 2 architecture: integrated ceramic bypass capacitors minimize high-di/dt loop area, fast clean switching edges reduce harmonic energy, and optional spread spectrum modulation (via SYNC pin) dithers the 2MHz fundamental by ±10%, lowering peak emissions without external filters.
Can LT8692SIV#PBF operate with only Channel 1 enabled while Channels 2–4 remain powered down?
Yes. The LT8692SIV#PBF supports independent channel enable/disable via EN1–EN4 pins. When EN2–EN4 are held low (≤0.64V), Channels 2–4 are fully disabled with near-zero current draw. VIN234 may be left unconnected or tied to GND, and INTVCC will be sourced solely from VIN1 - preserving system efficiency in partial-rail operation.
What is the purpose of the PG pin on LT8692SIV#PBF, and how is its threshold defined?
The PG (Power Good) pin on LT8692SIV#PBF is an open-drain output that goes low when any enabled channel's FB pin deviates by more than ±7.5% from the 0.800V internal reference, or during UVLO, thermal shutdown, or EN/UVLO deactivation. It provides system-level fault indication without external monitoring circuitry.
Does LT8692SIV#PBF require external boost capacitors for all four channels?
No. The LT8692SIV#PBF integrates boost capacitors for VIN234, INTVCC, and BST nodes for Channels 2–4. Only Channel 1 requires an external BST1 capacitor (0.22µF recommended between BST1 and SW1) to ensure robust top-FET gate drive under high-duty-cycle conditions - significantly reducing external component count versus legacy quad-buck solutions.
LT8692SIV#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:
- 4
- Voltage - Input (Min):
- 1.2V, 3V
- Voltage - Input (Max):
- 8V, 42V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 8V, 42V
- Current - Output:
- 1A, 1A, 1A, 2A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 20-LQFN (4x3)
LT8692SIV#PBF FAQ
1.How can I place an order for LT8692SIV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8692SIV#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 LT8692SIV#PBF reliable?
The price and inventory of LT8692SIV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8692SIV#PBF is usually 5 days.
3.What payment methods are accepted for LT8692SIV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8692SIV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8692SIV#PBF?
LT8692SIV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8692SIV#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 LT8692SIV#PBF?
For technical support, including LT8692SIV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8692SIV#PBF requirements.
6.How does Aetrix verify that LT8692SIV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8692SIV#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 LT8692SIV#PBF meets industry standards.
7.What is the process for return or replacement of LT8692SIV#PBF?
All LT8692SIV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8692SIV#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 LT8692SIV#PBF part is unused and in its original packaging.
Return procedure for LT8692SIV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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