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Analog Devices Inc. LT8653SIV#WPBF
- Part No.:
- LT8653SIV#WPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TFQFN Exposed Pad
- Datasheet:
-
LT8653SIV#WPBF.pdf
- Description:
- IC REG BUCK 3.3V/5V DL 20LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,068
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Product details
Overview
LT8653SIV#WPBF from Analog Devices is a dual-channel synchronous step-down DC/DC regulator delivering up to 2A per channel continuously (3A peak), featuring Silent Switcher®2 architecture for ultralow EMI, 6.2µA quiescent current in Burst Mode, and fixed 5V/3.3V outputs in pin-strapped configuration - used in automotive infotainment power rails and ADAS domain controllers.
For engineers reviewing the LT8653SIV#WPBF datasheet, LT8653SIV#WPBF pinout, LT8653SIV#WPBF application, or LT8653SIV#WPBF equivalent, key selection criteria include AEC-Q100 qualification, 3.0–42V input range, internal 2MHz switching frequency, 30ns minimum on-time, and dual-channel independent enable/PG signaling.
Technical Context
The LT8653SIV#WPBF integrates two identical monolithic buck regulators sharing a common VIN and GND, each with independent FB, VC, SS, PG, and SW nodes. Its second-generation Silent Switcher architecture embeds bypass capacitors internally to minimize high-frequency loop area and suppress radiated emissions without external layout tuning.
It supports three operating modes: Burst Mode (ultralow IQ), forced continuous mode (FCM) with or without spread-spectrum modulation (SSM), and external clock synchronization via SYNC pin. Channel regulation uses peak-current-mode control with internal 0.8V reference, and pin-selectable output voltages (1.8V/3.3V/5V) are implemented via D0/D1 logic states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports 12V/24V automotive battery systems with cold-crank margin down to 3V. |
| Output Current per Channel | 2A continuous, 3A peak - enables dual-rail powering of SoC cores and I/O domains without derating. |
| Quiescent Current | 6.2µA at 12VIN→5V/3.3V - sustains >1-year battery standby in always-on vehicle modules. |
| Switching Frequency | Internal 2MHz (RT = VCC) - allows use of compact 2.2µH inductors and fits within CISPR-25 Class 5 radiated limits. |
| Feedback Reference | 0.790–0.810V (±1%) - ensures tight output regulation across –40°C to 125°C junction temperature. |
| Minimum On-Time | 30ns - supports high VIN-to-low VOUT conversion (e.g., 42V→3.3V) at 2MHz without pulse-skipping. |
| EMI Performance | CISPR-25 Class 5 compliant with spread spectrum - eliminates need for external EMI filters in automotive designs. |
Pinout & Package
LT8653SIV#WPBF is housed in a thermally enhanced 4mm × 3mm × 0.94mm 20-lead LQFN package with exposed thermal pad (Pin 21 = GND). The package is AEC-Q100 qualified and RoHS-compliant with Au (e4) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0, D1 (Pins 1, 2) | Output voltage select bits | Set fixed 1.8V/3.3V/5V outputs without external resistors; OPEN/OPEN = 5V/3.3V default. |
| PG1, PG2 (Pins 3, 4) | Power good open-drain outputs | Assert low until respective FB pin reaches ±7.5% of target; enable sequenced system startup. |
| SYNC (Pin 5) | Mode control & sync input | Ground = Burst Mode; float = FCM; ≥2.8V = FCM+SSM; external clock = sync to master timing source. |
| CLKOUT (Pin 6) | Phase-shifted clock output | 90° out-of-phase square wave in FCM - enables 4-phase interleaving with other regulators. |
| SW1, SW2 (Pins 7, 8) | Switch node outputs | Connect directly to inductors; require minimal PCB copper area to preserve EMI performance. |
| VCC (Pin 9) | Internal bias rail | Supplied from BIAS if >3.1V, else from VIN; must not be loaded externally. |
| BIAS (Pin 10) | Efficiency-optimized supply input | Tie to highest VOUT ≥3.3V to reduce VIN current draw and improve light-load efficiency. |
| VC1, VC2 (Pins 11, 16) | Error amplifier compensation outputs | Connect to VCC for internal compensation (2.5µA IQ); external RC network enables custom loop response. |
| FB1, FB2 (Pins 12, 15) | Feedback inputs | Regulated to 0.8V reference; direct connection used for fixed-output configurations. |
| SS1, SS2 (Pins 13, 14) | Soft-start/tracking inputs | Capacitor-programmable ramp rate; <0.8V forces output tracking for controlled power-up sequencing. |
| RT (Pin 17) | Frequency programming input | Resistor-to-GND sets fSW from 300kHz–3MHz; tie to VCC for factory-trimmed 2MHz operation. |
| EN/UV (Pin 18) | Enable & undervoltage lockout | Hysteretic threshold (0.74V/0.77V) enables battery brownout protection and controlled shutdown. |
| VIN (Pins 19, 20) | Main power input | High-current path for both channels; requires local 47µF ceramic + bulk capacitance near pins. |
| GND (Pin 21) | System ground & thermal pad | Exposed pad must be soldered to PCB ground plane for θJA = 28°C/W thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher®2 architecture | Integrated VIN/VCC/BST bypass capacitors eliminate layout-sensitive EMI loops - achieves CISPR-25 Class 5 without ferrites or shields. |
| Dual independent power good signals | PG1 and PG2 provide per-channel fault detection and sequencing capability - essential for ASIL-B domain controller power management. |
| Pin-strappable fixed outputs | D0/D1 logic selects 1.8V/3.3V/5V without external resistors - reduces BOM count and PCB area in cost-sensitive automotive modules. |
| 30ns minimum on-time | Enables single-stage 42V→3.3V conversion at 2MHz - avoids cascaded regulation and improves system efficiency by ~8%. |
| AEC-Q100 Grade I qualification | Guaranteed operation from –40°C to +125°C junction temperature - validated for under-hood and infotainment applications. |
| Spread-spectrum modulation | Up to ±10% frequency dithering reduces peak EMI by 10dB - meets stringent OEM EMC requirements without design iteration. |
Applications
| Automotive Infotainment Head Unit | ADAS Domain Controller |
|---|---|
Use Scenario: Powering SoC core (1.8V), I/O (3.3V), and USB PHY (5V) rails in a centralized head unit with CAN/FD and Ethernet connectivity. IC Role / Device Role / Timing Role: Dual-channel PMIC providing tightly regulated, sequenced, and monitored power with integrated PG signaling for boot integrity. Use Value: Eliminates need for discrete EMI filters and external soft-start circuitry - reduces bill-of-materials by 7 components and PCB area by 120 mm². | Use Scenario: Supplying vision processor (3.3V), radar SoC (1.8V), and camera interface (5V) in a zonal E/E architecture with functional safety requirements. IC Role / Device Role / Timing Role: AEC-Q100-qualified dual buck regulator delivering independent, fault-monitored power with thermal shutdown and UVLO. Use Value: Enables single-chip solution for multi-rail domain controller power - meets ISO 26262 ASIL-B diagnostic coverage via dual PG outputs and independent EN control. |
| Industrial Telematics Gateway | Commercial Vehicle Telematics |
Use Scenario: Powering LTE modem (3.3V), GNSS receiver (1.8V), and CAN transceiver (5V) in a 24V truck telematics module operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: High-input-voltage dual buck converter with wide temperature support and ultralow quiescent current for battery-backed operation. Use Value: 6.2µA IQ extends backup battery life to >18 months - critical for maintenance-free remote fleet monitoring units. | Use Scenario: Providing isolated 5V for CAN FD communication, 3.3V for microcontroller, and 1.8V for memory in a heavy-duty vehicle black box recorder with vibration resistance. IC Role / Device Role / Timing Role: Automotive-grade dual regulator with robust EMI immunity and mechanical reliability for harsh commercial vehicle environments. Use Value: Passes CISPR-25 Class 5 radiated emission tests without shielded enclosures - reduces mechanical assembly cost by $3.20/unit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8650SIV#WPBF | Single 4A channel instead of dual 2A; no D0/D1 pin-strapping; same Silent Switcher2 architecture and AEC-Q100 rating. | Used where higher per-rail current is needed but only one output voltage is required - e.g., powering GPU and memory from same rail. | Select LT8650SIV#WPBF when load demands exceed 2A per rail or fixed dual outputs are unnecessary. |
| TPS6521905RGER | TI dual buck (3A/2A) with integrated LDOs and fuel gauge; no Silent Switcher EMI reduction; 2.7–5.5V input only - not 42V capable. | Targeted at low-voltage battery-powered portable devices, not automotive 12V/24V systems. | Choose TPS6521905RGER only for consumer-grade 3.3V/1.8V applications with battery telemetry needs - not for automotive primary power rails. |
Compared with LT8650SIV#WPBF, LT8653SIV#WPBF provides true independent dual-rail regulation with pin-selectable outputs and per-channel PG signaling, while TPS6521905RGER lacks high-voltage capability and EMI-hardened architecture - making LT8653SIV#WPBF the sole option meeting full automotive CISPR-25 and AEC-Q100 requirements for dual-rail 42V systems.
Availability
LT8653SIV#WPBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS domain controllers, and industrial telematics gateways requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for LT8653SIV#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 LT8653SIV#WPBF belongs to the Silent Switcher®2 family of high-efficiency, low-EMI DC/DC regulators designed specifically for demanding automotive and industrial power applications where EMI compliance and thermal reliability are critical.
FAQ
What is the maximum input voltage supported by the LT8653SIV#WPBF?
The LT8653SIV#WPBF supports an absolute maximum input voltage of 42V, with guaranteed operation across a 3.0V to 42V input range. This makes it suitable for 12V and 24V automotive battery systems, including cold-crank scenarios where voltage may dip to 3V and surge transiently above nominal levels. The device includes integrated overvoltage protection on the VIN pin to prevent damage during load-dump events.
Does the LT8653SIV#WPBF require external compensation components?
No - the LT8653SIV#WPBF supports internal compensation by connecting VC1 and VC2 to VCC, enabling a complete dual-output solution with only five external components (two inductors, two output capacitors, and one input capacitor). External compensation is optional and used only when custom loop bandwidth or phase margin optimization is required for specific dynamic load conditions.
How does the LT8653SIV#WPBF achieve CISPR-25 Class 5 compliance?
The LT8653SIV#WPBF achieves CISPR-25 Class 5 radiated emission compliance through its Silent Switcher®2 architecture, which integrates ceramic bypass capacitors directly into the LQFN package for VIN, VCC, BST1, and BST2. This minimizes high-frequency current loop area and eliminates layout sensitivity - allowing the device to meet Class 5 limits on standard 2-layer PCBs without additional EMI filters or shielding.
Can the LT8653SIV#WPBF operate with different output voltages on each channel?
Yes - the LT8653SIV#WPBF supports independent output voltages via D0/D1 pin strapping: D0/D1 = OPEN/OPEN yields 5V/3.3V; D0/D1 = HIGH/LOW yields 5V/1.8V; D0/D1 = LOW/HIGH yields 3.3V/5V. Each channel's FB pin is regulated to the selected voltage directly, eliminating the need for external feedback dividers in fixed-output configurations.
Is the LT8653SIV#WPBF pin-compatible with other members of the LT865x family?
No - the LT8653SIV#WPBF has a unique 20-pin LQFN pinout optimized for dual-channel operation with dedicated PG, SS, VC, and FB pins per channel. It is not pin-compatible with LT8650S (16-pin) or LT8645S (16-pin); board redesign is required when migrating between these families due to differing pin counts, functions, and thermal pad configurations.
LT8653SIV#WPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®2
- Package/Case:
- 20-TFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 3.3V, 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A, 2A
- Frequency - Switching:
- 300kHz ~ 3MHz
- 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)
LT8653SIV#WPBF FAQ
1.How can I place an order for LT8653SIV#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8653SIV#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 LT8653SIV#WPBF reliable?
The price and inventory of LT8653SIV#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8653SIV#WPBF is usually 5 days.
3.What payment methods are accepted for LT8653SIV#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8653SIV#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8653SIV#WPBF?
LT8653SIV#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8653SIV#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 LT8653SIV#WPBF?
For technical support, including LT8653SIV#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8653SIV#WPBF requirements.
6.How does Aetrix verify that LT8653SIV#WPBF is sourced from the original manufacturer or authorized distributors?
All LT8653SIV#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 LT8653SIV#WPBF meets industry standards.
7.What is the process for return or replacement of LT8653SIV#WPBF?
All LT8653SIV#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8653SIV#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 LT8653SIV#WPBF part is unused and in its original packaging.
Return procedure for LT8653SIV#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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