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Analog Devices Inc. LT8653SIV#PBF
- Part No.:
- LT8653SIV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TFQFN Exposed Pad
- Datasheet:
-
LT8653SIV#PBF.pdf
- Description:
- IC REG BUCK 3.3V/5V DL 20LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:292
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Product details
Overview
LT8653SIV#PBF 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. It operates from 3.0V to 42V input and targets automotive infotainment power rails requiring high efficiency at 2MHz switching.
For engineers reviewing the LT8653SIV#PBF datasheet, LT8653SIV#PBF pinout, LT8653SIV#PBF application, or LT8653SIV#PBF equivalent, key selection criteria include its AEC-Q100 qualification, integrated bypass capacitors eliminating layout sensitivity, dual-channel independent enable/control, and support for both forced continuous and ultralow-IQ Burst Mode operation across wide temperature range.
Technical Context
The LT8653SIV#PBF implements peak-current-mode control with internal 0.8V reference and dual independent error amplifiers (VC1/VC2), enabling fast transient response via external compensation or simplified operation with internal 2MHz-compensated loop. Its Silent Switcher®2 architecture integrates VIN, VCC, BST1, and BST2 ceramic bypass capacitors within the LQFN package to minimize high-frequency current loop area.
Each channel supports pin-selectable fixed output voltages (1.8V/3.3V/5.0V) via D0/D1 logic states, programmable switching frequency (300kHz–3MHz) via RT resistor or internal 2MHz default, and independent power-good (PG1/PG2) monitoring with ±7.5% threshold hysteresis. SYNC pin enables Burst Mode, forced continuous mode, spread-spectrum modulation, or external clock synchronization.
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. |
| Output Current per Channel | 2A continuous, 3A peak - enables dual-rail powering of microcontrollers and interface ICs without derating. |
| Quiescent Current (Burst Mode) | 6.2µA at 12VIN → 5V/3.3V - sustains >1-year battery life in always-on vehicle modules. |
| Switching Frequency | Internally fixed 2MHz or adjustable 300kHz–3MHz - allows compact 2.2µH inductors and avoids AM radio band. |
| Output Ripple | <10mVP-P - meets noise-sensitive analog supply requirements without additional LC filtering. |
| Thermal Performance | θJA = 28°C/W, TJMAX = 125°C - supports full 2A/channel operation at 85°C ambient with standard 2-layer PCB. |
| AEC-Q100 Grade | Grade I (–40°C to +125°C) - qualified for engine bay and ADAS ECU power applications. |
Pinout & Package
LT8653SIV#PBF is housed in a thermally enhanced 4mm × 3mm × 0.94mm 20-lead LQFN package with exposed thermal pad (Pin 21 = GND). The package complies with MSL Level 3 and supports reflow per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0 (Pin 1) | Output voltage select bit | Configures FB1/FB2 regulation point (1.8V/3.3V/5.0V) when combined with D1; open = 5V default. |
| PG1 (Pin 4) | Channel 1 power-good indicator | Open-drain output pulled low until FB1 reaches ±7.5% of target; enables sequenced system startup. |
| SYNC (Pin 5) | Mode control and clock input | GND = Burst Mode; float = forced continuous; ≥2.8V = FCM + spread spectrum; external clock = sync source. |
| SW1/SW2 (Pins 7,8) | Power switch node outputs | Connect directly to inductors; requires minimal PCB copper area to suppress radiated EMI per Silent Switcher®2. |
| VC1/VC2 (Pins 11,16) | Error amplifier compensation terminals | Tie to VCC for internal compensation (6.2µA IQ); connect RC network for external loop tuning and faster transients. |
| GND (Pin 21) | System ground and thermal pad | Exposed pad must be soldered to PCB ground plane to achieve θJA = 28°C/W and prevent thermal shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher®2 architecture | Integrated VIN/VCC/BST bypass capacitors reduce radiated EMI by >30dB vs. conventional QFN, passing CISPR 25 Class 5 peak/average limits without external filters. |
| Dual independent power-good outputs | PG1 and PG2 provide channel-specific fault signaling with ±7.5% accuracy, enabling robust power sequencing in multi-rail systems. |
| Pin-strappable fixed outputs | D0/D1 logic states select 1.8V/3.3V/5.0V outputs - eliminates external feedback resistors and reduces BOM count to five total components. |
| 2MHz internal switching frequency | Enables use of 2.2µH inductors and 100µF output capacitors, reducing solution size by >40% vs. 500kHz converters at same power level. |
| Ultralow 30ns minimum on-time | Supports 12V→1.8V conversion at 2MHz with >90% duty cycle margin, enabling single-stage buck solutions for low-VOUT rails. |
| BIAS pin optimization | Draws bias current from VOUT (≥3.3V) instead of VIN, improving full-load efficiency by 0.8–1.2% in typical automotive configurations. |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
|
Use Scenario: Dual-rail power for SoC (5V I/O, 3.3V core) and display interface in head-unit systems operating across –40°C to +105°C. IC Role / Device Role / Timing Role: Primary dual-output buck regulator providing regulated 5V/3.3V with independent PG signaling and AEC-Q100 compliance. Use Value: Eliminates need for discrete EMI filters and secondary LDOs; 6.2µA IQ extends parking-mode battery life beyond 30 days. |
Use Scenario: Compact, low-noise power for CMOS image sensor and ISP in rear-view camera modules mounted near exhaust. IC Role / Device Role / Timing Role: High-efficiency, high-temperature dual buck supplying 3.3V sensor rail and 1.8V digital core with thermal foldback protection. Use Value: Silent Switcher®2 ensures CISPR 25 compliance without shielding; 2MHz operation enables <80mm² total solution size. |
| Industrial PLC I/O Module | Telematics Control Unit (TCU) |
|
Use Scenario: Reliable 5V/3.3V power for isolated CAN transceivers, ADCs, and microcontrollers in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Robust dual-channel regulator with UVLO hysteresis (30mV), wide 3–42V input, and -40°C to +125°C operation. Use Value: Internal 2MHz compensation simplifies design; PG1/PG2 enable diagnostics and safe power-up sequencing under brownout conditions. |
Use Scenario: Always-on power management for LTE modem, GNSS receiver, and secure MCU in vehicle connectivity gateways. IC Role / Device Role / Timing Role: Low-IQ dual buck supporting sleep/wake cycles with fast transient response (<50µs) to modem burst traffic. Use Value: VC1/VC2 pins allow external compensation for <100mV overshoot during 0→2A load steps; SYNC pin enables spread-spectrum to reduce narrowband emissions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8650SIV#PBF | Single-channel 4A output; lacks second channel and PG2; identical Silent Switcher®2 core and 6.2µA IQ. | Requires two ICs to match dual-rail capability; higher BOM cost but same EMI performance per channel. | Select when only one regulated rail is needed or when channel redundancy is not required. |
| TPS6521905RGER | 3-channel buck (2×2A + 1×1.5A); no integrated bypass caps; 17µA IQ; non-AEC-Q100; 16-pin QFN. | Higher integration but inferior EMI performance; unsuitable for automotive front-end applications requiring Class 5 compliance. | Select for cost-sensitive industrial applications where EMI filtering can be added externally and AEC-Q100 is not mandated. |
Compared with LT8653SIV#PBF, LT8650SIV#PBF provides higher per-channel current but requires duplication for dual-rail needs, while TPS6521905RGER offers triple outputs at the expense of EMI robustness and automotive qualification - making LT8653SIV#PBF optimal for space-constrained, safety-critical dual-rail automotive designs.
Availability
LT8653SIV#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and industrial PLC I/O modules requiring stable component supply with AEC-Q100 qualification and long-term production support.
Supply support for LT8653SIV#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 automotive, industrial, communications, and healthcare markets since 1965.
The LT8653SIV#PBF belongs to Analog Devices' Silent Switcher®2 power management portfolio, engineered specifically for automotive and industrial applications demanding ultralow EMI, high efficiency at high frequency, and guaranteed operation across extended temperature ranges.
FAQ
What is the maximum junction temperature specification for the LT8653SIV#PBF?
The LT8653SIV#PBF has a maximum junction temperature (TJMAX) of 125°C and is guaranteed to operate over the full –40°C to +125°C junction temperature range. Thermal shutdown activates above 150°C to protect the device. The 28°C/W θJA value assumes proper soldering of the exposed GND pad to a 4cm² copper area on a 2-layer PCB - exceeding this limit risks premature thermal limiting during 2A/channel operation.
How does the LT8653SIV#PBF achieve ultralow EMI without external filters?
The LT8653SIV#PBF achieves ultralow EMI through Silent Switcher®2 architecture, which integrates ceramic bypass capacitors for VIN, VCC, BST1, and BST2 directly into the LQFN package. This minimizes high-frequency current loop area and eliminates layout-dependent EMI spikes. Combined with symmetrical pinout and optimized internal routing, it passes CISPR 25 Class 5 radiated emission limits even on simple 2-layer PCBs without ferrite beads or shielded inductors.
Can the LT8653SIV#PBF generate 1.8V and 3.3V simultaneously from the same device?
Yes, the LT8653SIV#PBF can generate 1.8V and 3.3V simultaneously using D0/D1 pin strapping: configure D0 = low and D1 = high for FB1 = 1.8V and FB2 = 3.3V. Both channels retain independent control of EN/UV, PG, VC, and SS pins, allowing asymmetric output configurations while sharing the same 3–42V input. No external feedback resistors are needed in this mode.
What is the purpose of the BIAS pin on the LT8653SIV#PBF?
The BIAS pin on the LT8653SIV#PBF allows the IC to draw bias current from a clean, regulated output rail (e.g., VOUT1 = 5V) instead of the noisy high-voltage input (VIN). When BIAS ≥ 3.1V, internal circuitry sources current from BIAS, improving full-load efficiency by up to 1.2% and reducing input supply ripple. For 3.3V/5V dual outputs, tie BIAS to the higher voltage rail (e.g., 5V) with a 1µF local capacitor.
Does the LT8653SIV#PBF support external frequency synchronization?
Yes, the LT8653SIV#PBF supports external frequency synchronization via the SYNC pin. Applying an external clock signal (300kHz–3MHz) to SYNC forces both channels into forced continuous mode and locks their switching edges to the external source. The CLKOUT pin then mirrors the SYNC waveform's phase, duty cycle, and frequency - enabling precise multi-phase interleaving with up to four regulators for reduced input/output ripple.
LT8653SIV#PBF 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 20-LQFN (4x3)
LT8653SIV#PBF FAQ
1.How can I place an order for LT8653SIV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8653SIV#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 LT8653SIV#PBF reliable?
The price and inventory of LT8653SIV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8653SIV#PBF is usually 5 days.
3.What payment methods are accepted for LT8653SIV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8653SIV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8653SIV#PBF?
LT8653SIV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8653SIV#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 LT8653SIV#PBF?
For technical support, including LT8653SIV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8653SIV#PBF requirements.
6.How does Aetrix verify that LT8653SIV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8653SIV#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 LT8653SIV#PBF meets industry standards.
7.What is the process for return or replacement of LT8653SIV#PBF?
All LT8653SIV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8653SIV#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 LT8653SIV#PBF part is unused and in its original packaging.
Return procedure for LT8653SIV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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