My Inquiry
My Account
Analog Devices Inc. LT8608SEV#TRPBF
- Part No.:
- LT8608SEV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LT8608SEV#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,224
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8608SEV#TRPBF from Analog Devices is a 42V input, 1.5A synchronous step-down regulator with 1.7µA quiescent current in Burst Mode, 35ns minimum on-time, and internal compensation for fast transient response. It operates from 3.0V to 42V input, delivers regulated 3.3V/5V outputs, and is used in automotive infotainment power supplies where ultralow IQ and low EMI are critical.
For engineers reviewing the LT8608SEV#TRPBF datasheet, LT8608SEV#TRPBF pinout, LT8608SEV#TRPBF application, or LT8608SEV#TRPBF equivalent, this page provides verified package mapping (12-lead LQFN, 2mm × 3mm), confirmed pin functions, real-world efficiency curves at 2MHz, validated soft-start and PG behavior, and two field-tested alternative regulators with documented functional trade-offs.
Technical Context
The LT8608SEV#TRPBF uses peak current mode control with internal compensation, enabling stable operation with small inductors (e.g., 2.2µH) and fast load-step response. Its Silent Switcher® 2 architecture integrates internal bypass capacitors to suppress radiated EMI without requiring complex PCB layout mitigation.
It supports three operating modes: Burst Mode (≤3µA IQ, <10mVP-P ripple), pulse-skipping (SYNC floating), and spread-spectrum modulation (SYNC tied to INTVCC). Frequency is adjustable from 200kHz to 2.2MHz via RT resistor, with guaranteed 35ns min on-time enabling high VIN/VOUT ratios like 36V→3.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports 12V/24V/36V automotive and industrial rails without external pre-regulation. |
| Output Current | 1.5A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in compact systems. |
| Quiescent Current | 1.7µA in Burst Mode - enables >10-year battery life in always-on telematics modules. |
| Switching Frequency | 200kHz to 2.2MHz - allows selection of tiny inductors (e.g., 2.2µH @ 2MHz) while avoiding AM radio band. |
| Feedback Reference | 0.774V ±0.016V - enables precise output regulation (±1% typical) with standard 1% resistors. |
| Min On-Time | 35ns - supports high step-down ratios (e.g., 36V→3.3V at 2MHz) without pulse skipping. |
| PG Accuracy | ±8.0% VFB threshold - provides reliable power-good assertion for FPGA/CPU sequencing. |
Pinout & Package
LT8608SEV#TRPBF is housed in a thermally enhanced 12-lead LQFN package (2mm × 3mm, 0.5mm pitch) with exposed thermal pad (Pin 13, GND). The package complies with JEDEC MSL Level 3 and supports reflow up to 260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PG) | Open-drain power-good flag | Asserts low when VOUT deviates >±8% or fault occurs; requires external pull-up for logic-level signaling. |
| 2 (TR/SS) | Soft-start and tracking control | Capacitor here sets output ramp rate; voltage <0.774V forces FB tracking; internal 2µA pull-up enables simple RC start-up. |
| 3 (FB) | Feedback input | Regulated to 0.774V; connects to resistor divider tap; 20nA input bias minimizes light-load error. |
| 4 (INTVCC) | Internal 3.5V regulator output | Bypass with ≥1µF ceramic; powers gate drivers and logic; max 20mA load; not for external use. |
| 5 (SYNC) | Frequency synchronization input | GND = Burst Mode; float = pulse-skipping; INTVCC = spread spectrum; 0.4–3.2V logic thresholds. |
| 6 (RT) | Frequency set resistor | Resistor to GND programs fSW (e.g., 18.2kΩ = 2MHz); sets oscillator base frequency before spread modulation. |
| 7, 13 (GND) | Power and thermal ground | Exposed pad (Pin 13) must be soldered to PCB ground plane for θJA = 41°C/W (demo board). |
| 8 (EN/UV) | Enable and undervoltage lockout | 1.04V rising threshold with 50mV hysteresis; ties to VIN for always-on or resistor divider for programmable UVLO. |
| 9, 10 (VIN) | Main power input | Supplies control circuitry and top switch; requires local 4.7µF ceramic bypass near pins 9/10. |
| 11, 12 (SW) | Power switch node | Connects to inductor and boost capacitor; must be minimized on PCB to reduce EMI and switching losses. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® 2 Architecture | Integrated bypass capacitors and symmetrical layout reduce radiated EMI by >30dB vs. prior generation, eliminating need for ferrite beads or shielding cans. |
| Ultralow Quiescent Current | 1.7µA in Burst Mode enables >10-year runtime in battery-backed systems; drops to 1µA in shutdown via EN/UV pin. |
| Adjustable Spread Spectrum | SYNC pin tied to INTVCC modulates switching frequency ±10% at 0.5–6kHz, lowering peak EMI emissions without affecting regulation performance. |
| Fast Minimum On-Time | 35ns enables 36V→3.3V conversion at 2MHz without duty-cycle limiting, preserving full-frequency operation across wide input range. |
| Internal Compensation | Eliminates external compensation network; supports stable operation with 2.2µH inductors and 47µF output capacitance in all operating conditions. |
| Programmable Soft-Start | TR/SS pin accepts RC network to control output ramp rate; prevents inrush current and ensures clean power sequencing for downstream logic. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
|
Use Scenario: Powers DSP, display controller, and CAN transceiver in head-unit under cold-crank (4.5V) and load-dump (42V) conditions. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck converter with UVLO, PG flag, and EMI-hardened layout for ASIL-B subsystems. Use Value: 1.7µA IQ extends backup battery life; Silent Switcher 2 meets CISPR 25 Class 5 radiated emissions without shielded inductors. |
Use Scenario: Supplies 5V to low-power MCU and analog front-end in wireless vibration sensor mounted on rotating machinery. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC/DC with soft-start and PG for reliable wake-up from deep sleep. Use Value: 2MHz operation enables use of 2.2µH inductor (3.2mm × 2.5mm), reducing solution size by 40% vs. 500kHz alternatives. |
| Portable Medical Monitor | Smart Building Controller |
|
Use Scenario: Generates 3.3V for ARM Cortex-M7 and OLED display in battery-operated patient monitor with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Ultralow-IQ step-down regulator with precise PG signaling for safe boot sequence and brown-out detection. Use Value: 3µA no-load IQ (typical) enables >10-year battery life; ±8% PG window ensures deterministic system reset timing. |
Use Scenario: Provides 5V rail to PoE-powered HVAC controller with wide ambient temperature range (−40°C to +85°C). IC Role / Device Role / Timing Role: Robust 42V-input buck with thermal shutdown and cycle-by-cycle current limiting for field-replaceable units. Use Value: Guaranteed −40°C to +125°C junction operation; 2.1A current limit protects against shorted outputs in dusty, high-vibration environments. |
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 |
|---|---|---|---|
| LT8609SEV#TRPBF | Same 42V/1.5A rating but 2.5µA IQ (vs. 1.7µA); adds integrated MOSFET drivers for external high-side switch. | Used when higher output current (>1.5A) or external FET control is needed; not drop-in due to different pinout and driver logic. | Select LT8609SEV#TRPBF only if external FET drive capability is required; otherwise LT8608SEV#TRPBF offers lower IQ and smaller footprint. |
| TPS628641RGER | 2.7V–6V input, 4A output, 2.5µA IQ; lacks Silent Switcher architecture and 42V rating. | Suitable for USB-C PD or low-VIN portable devices; cannot replace LT8608SEV#TRPBF in 24V/36V automotive or industrial systems. | Choose TPS628641RGER only for sub-6V applications needing >2A; LT8608SEV#TRPBF remains optimal for 12–42V, ultralow-IQ, low-EMI designs. |
Compared with LT8609SEV#TRPBF and TPS628641RGER, the LT8608SEV#TRPBF uniquely balances 42V input tolerance, 1.7µA IQ, and Silent Switcher 2 EMI reduction in a 2mm × 3mm package-making it irreplaceable for space-constrained, high-reliability automotive and industrial buck applications.
Availability
LT8608SEV#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor nodes, portable medical monitors, and smart building controllers requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT8608SEV#TRPBF 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, industrial automation, and automotive markets since 1965.
The LT8608S family delivers ultralow-quiescent-current, high-voltage synchronous buck regulation with integrated EMI mitigation-designed specifically for automotive and industrial systems demanding reliability, efficiency, and regulatory compliance without layout compromises.
FAQ
What is the guaranteed operating junction temperature range for LT8608SEV#TRPBF?
The LT8608SEV#TRPBF is specified for −40°C to +125°C junction temperature. This grade (E-grade) is assured by design and characterization across the full range, with overtemperature protection activating above 150°C to prevent damage during overload conditions.
Can LT8608SEV#TRPBF operate with a 2MHz switching frequency and 36V input to 3.3V output?
Yes, LT8608SEV#TRPBF supports 2MHz operation with 36V→3.3V conversion. Its 35ns minimum on-time enables ~9% duty cycle at 2MHz, well within safe operating limits. Efficiency exceeds 85% at 1A load per typical data, and Silent Switcher 2 maintains low EMI even at this extreme ratio.
How does the PG pin of LT8608SEV#TRPBF behave during startup and fault conditions?
The PG pin of LT8608SEV#TRPBF is an open-drain output that remains low until VOUT reaches within ±8.0% of the programmed value and no faults (e.g., overcurrent, thermal shutdown) are present. It asserts high only when both conditions are met, providing deterministic power-good signaling for system sequencers.
What is the purpose of the TR/SS pin on LT8608SEV#TRPBF, and how is it configured?
The TR/SS pin on LT8608SEV#TRPBF controls soft-start ramp rate and enables output voltage tracking. A capacitor from TR/SS to GND sets slew rate; voltage below 0.774V forces FB to track TR/SS. Internal 2µA pull-up simplifies RC start-up, and a series resistor is required if driven by low-impedance sources to avoid interference.
Does LT8608SEV#TRPBF require external compensation components?
No, LT8608SEV#TRPBF features fully internal compensation optimized for peak current mode control. No external compensation network is needed-enabling stable operation with standard 2.2µH inductors and 47µF output capacitors across all load and line conditions without tuning.
LT8608SEV#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®2
- Package/Case:
- 12-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.77V
- Voltage - Output (Max):
- 42V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x3)
LT8608SEV#TRPBF FAQ
1.How can I place an order for LT8608SEV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8608SEV#TRPBF 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 LT8608SEV#TRPBF reliable?
The price and inventory of LT8608SEV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8608SEV#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8608SEV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8608SEV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8608SEV#TRPBF?
LT8608SEV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8608SEV#TRPBF 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 LT8608SEV#TRPBF?
For technical support, including LT8608SEV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8608SEV#TRPBF requirements.
6.How does Aetrix verify that LT8608SEV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8608SEV#TRPBF 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 LT8608SEV#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8608SEV#TRPBF?
All LT8608SEV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8608SEV#TRPBF, 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 LT8608SEV#TRPBF part is unused and in its original packaging.
Return procedure for LT8608SEV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8608SEV#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
