My Inquiry
My Account
Analog Devices Inc. LT8608IMSE#TRPBF
- Part No.:
- LT8608IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8608IMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,221
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8608IMSE#TRPBF from Analog Devices is a 42V, 1.5A synchronous step-down regulator with 2.5µA 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 targets always-on automotive and industrial power rails requiring ultralow IQ and low EMI.
For engineers reviewing the LT8608IMSE#TRPBF datasheet, LT8608IMSE#TRPBF pinout, LT8608IMSE#TRPBF application, or LT8608IMSE#TRPBF equivalent, key selection factors include its 10-lead MSOP package with SYNC/TR/SS pins, programmable 200kHz–2.2MHz switching frequency, ±8.5% PG flag accuracy, and validated 92% efficiency at 0.5A/5V from 12VIN.
Technical Context
The LT8608IMSE#TRPBF implements peak current mode control with internal 0.778V reference and fixed-frequency PWM architecture. Its 35ns minimum on-time enables high VIN/VOUT ratios (e.g., 36VIN→3.3VOUT), while frequency foldback during start-up prevents inductor current runaway when VOUT is below regulation.
SYNC and TR/SS pins enable external clock synchronization, spread-spectrum modulation, soft-start ramp control, and output voltage tracking. The device supports both Burst Mode (≤2.5µA IQ) and pulse-skipping operation-selected via SYNC pin state-with no DFN-package limitations since this is the MSOP variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports wide automotive battery transients and industrial 24/36V rails without pre-regulation. |
| Quiescent Current | 2.5µA typical at no load - enables >10-year battery life in always-on sensor nodes and telematics modules. |
| Output Current | 1.5A continuous - sustains full load across –40°C to 125°C junction temperature range (I-grade). |
| Switching Frequency | 200kHz to 2.2MHz - adjustable via RT resistor; allows optimization of inductor size vs. efficiency for space-constrained designs. |
| Feedback Reference | 0.778V ±12mV - precise internal reference enabling accurate output regulation with minimal external component drift impact. |
| Power Good Threshold | ±8.5% of VOUT - provides reliable system reset signaling with built-in hysteresis to prevent chatter during marginal conditions. |
| Minimum On-Time | 35ns - enables high step-down ratios (e.g., 36VIN→3.3VOUT @ ~9% duty cycle) without pulse skipping or instability. |
Pinout & Package
LT8608IMSE#TRPBF uses a 10-lead MSOP package with exposed thermal pad (Pin 11 = GND). The exposed pad must be soldered to PCB ground plane for thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply for high-side NMOS gate drive | Requires 0.1µF ceramic capacitor to SW; enables efficient 100% duty-cycle capability and low RDS(ON) top switch operation. |
| SW | Switch node connecting internal power FETs to inductor | High dv/dt node; must be minimized in layout to reduce EMI and switching losses; connects directly to BST capacitor and inductor. |
| INTVCC | Internal 3.5V regulator output | Bypass with ≥1µF low-ESR ceramic; powers internal logic/drivers; not for external loading - limits IC functionality if improperly decoupled. |
| RT | Resistor-based oscillator frequency programming | Grounded resistor sets fSW from 200kHz–2.2MHz; value determines inductor size trade-off and light-load efficiency profile. |
| SYNC | External clock synchronization / mode selection | Ground = Burst Mode; float = pulse-skipping; INTVCC = spread-spectrum; enables EMI compliance without filter redesign. |
| EN/UV | Enable and input undervoltage lockout control | 1.05V rising threshold with 50mV hysteresis; supports programmable VIN UVLO using external resistor divider. |
| PG | Open-drain Power Good status flag | Pulls low when VOUT deviates >±8.5% or fault occurs; valid above 3.2V VIN - used for processor reset sequencing and system health monitoring. |
| TR/SS | Soft-start and output voltage tracking control | 2µA internal current source enables RC-programmed slew rate; supports controlled power-up and multi-rail sequencing with external reference. |
| FB | Feedback input for output voltage regulation | Regulated to 0.778V; resistor divider sets VOUT; 1% resistors recommended; 10pF phase lead cap required for stability with high-value dividers. |
| GND | Power and signal ground reference | Exposed pad (Pin 11) must be soldered to PCB ground plane - critical for thermal resistance (θJC = 10°C/W) and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces IQ to 2.5µA at no load while maintaining <10mVP-P output ripple - essential for battery-powered IoT sensors and automotive standby systems. |
| Synchronous Rectification | Integrated top/bottom NMOS switches eliminate external diode losses - achieves >92% efficiency at 0.5A/5V from 12VIN without heatsinking. |
| Spread-Spectrum Modulation | Reduces peak EMI by up to 20dB when SYNC is tied to 3.2–5.0V - meets CISPR 25 Class 5 requirements without added shielding or filters. |
| Fast Minimum On-Time | 35ns enables direct conversion from 36VIN to 3.3VOUT (9% duty cycle) - avoids cascaded regulators and saves board space in high-voltage applications. |
| Internal Compensation | Eliminates external compensation network - reduces BOM count and design risk while ensuring stable loop response across all operating conditions. |
| Accurate Power Good Flag | ±8.5% VOUT window with hysteresis ensures reliable microcontroller reset assertion and avoids false triggers during line/load transients. |
Applications
| Automotive Infotainment Power Supply | Industrial Sensor Node Regulator |
|---|---|
Use Scenario: Powers 3.3V MCU, CAN transceiver, and RF module in vehicle head unit with cold-crank (4.5V) and load-dump (42V) conditions. IC Role / Device Role / Timing Role: Primary 42V-input buck regulator delivering clean, sequenced 3.3V rail with PG confirmation before MCU boot. Use Value: 2.5µA IQ extends battery backup runtime during ignition-off; 35ns on-time maintains regulation during 4.5V cold-crank; SYNC enables EMI spread-spectrum for display timing compliance. |
Use Scenario: Powers LoRaWAN edge sensor with intermittent wake-up (10s active, 300s sleep) powered by coin cell or energy harvester. IC Role / Device Role / Timing Role: Always-on step-down converter supplying 3.3V to MCU and radio during ultra-low-duty-cycle operation. Use Value: 2.5µA IQ enables >10-year battery life; Burst Mode maintains <10mVP-P ripple during sleep; FB divider current minimized to avoid depleting microamp-level sources. |
| Medical Portable Diagnostic Device | Test & Measurement Instrumentation |
Use Scenario: Supplies 5V/1.5A to ADC, FPGA, and analog front-end in handheld ultrasound probe with Li-ion battery input (3.0–4.2V) and USB-C PD input (5–20V). IC Role / Device Role / Timing Role: Wide-input buck regulator supporting dual-source power with seamless switchover and precise 5V output tolerance. Use Value: 3.0V min VIN enables operation down to depleted battery; ±8.5% PG confirms stable rail before data acquisition; TR/SS enables synchronized power-up with FPGA configuration. |
Use Scenario: Generates low-noise 3.3V supply for precision DACs and clock buffers in benchtop oscilloscope mainboard with 12V/24V system rail. IC Role / Device Role / Timing Role: Low-EMI, high-efficiency intermediate regulator isolating sensitive analog circuitry from noisy digital domains. Use Value: Spread-spectrum SYNC reduces conducted emissions into 100MHz+ measurement bands; 2.2MHz fSW allows 1µH inductor for compact layout near high-speed traces. |
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 |
|---|---|---|---|
| LT8609SIV#TRPBF | Same 42V/1.5A rating but adds integrated input ESD protection (±30kV HBM) and improved light-load efficiency (2.0µA IQ). | Preferred for harsh environments (automotive cabins, factory floors) where ESD robustness is mandatory; requires same PCB footprint. | Select LT8609SIV#TRPBF when ESD immunity >15kV is required; otherwise LT8608IMSE#TRPBF offers lower cost and identical core performance. |
| MPQ4420AGL-AEC1-Z | Automotive-grade (AEC-Q100) 42V/2A buck with 17µA IQ in forced PWM mode; lacks SYNC/TR/SS pins and has 100ns min on-time. | Suitable for cost-sensitive automotive body electronics where burst-mode IQ is secondary to AEC-Q100 qualification and higher current. | Choose MPQ4420AGL-AEC1-Z only when AEC-Q100 certification is contractually required and 35ns on-time is not needed for high VIN/VOUT ratios. |
Compared with LT8609SIV#TRPBF, LT8608IMSE#TRPBF trades ESD robustness for lower BOM cost and identical thermal performance; versus MPQ4420AGL-AEC1-Z, it delivers superior light-load efficiency and finer control over EMI via spread-spectrum, but lacks automotive qualification.
Availability
LT8608IMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor nodes, and portable medical devices requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to 125°C operation.
Supply support for LT8608IMSE#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 industrial, automotive, communications, and healthcare markets.
The LT8608IMSE#TRPBF belongs to Analog Devices' Power by Linear™ family of high-efficiency DC/DC regulators designed specifically for ultralow-IQ, high-voltage, and low-EMI power conversion in space- and battery-constrained systems.
FAQ
What is the guaranteed operating temperature range for LT8608IMSE#TRPBF?
The LT8608IMSE#TRPBF is specified for –40°C to 125°C junction temperature and is qualified as Industrial grade (I-grade). This range is fully tested and guaranteed - unlike E-grade parts - making it suitable for under-hood automotive and industrial control cabinet applications where ambient temperatures exceed 85°C.
How does the SYNC pin affect LT8608IMSE#TRPBF efficiency and EMI performance?
The SYNC pin on LT8608IMSE#TRPBF directly controls operating mode: grounded for Burst Mode (2.5µA IQ, lowest EMI), floated for pulse-skipping (higher IQ, full-frequency operation), or tied to 3.2–5.0V for spread-spectrum modulation (reduces peak EMI by spreading energy across 0.5–6kHz bandwidth). Unlike DFN variants, the MSOP package retains full SYNC functionality.
Can LT8608IMSE#TRPBF regulate from 36V input down to 3.3V output without external components?
Yes - LT8608IMSE#TRPBF supports 36VIN→3.3VOUT conversion using its 35ns minimum on-time, eliminating need for pre-regulators. With RT = 18.2kΩ (2MHz), a 2.2µH inductor, and proper layout, it delivers 1.5A with <10mVP-P ripple in Burst Mode. No external compensation or feedforward capacitors are required due to internal compensation.
What is the purpose of the TR/SS pin on LT8608IMSE#TRPBF, and how is it used?
The TR/SS pin on LT8608IMSE#TRPBF provides dual functionality: soft-start control (via RC time constant) and output voltage tracking (by applying external reference voltage). Its 2µA internal current source allows simple capacitor-based ramp rate setting, and it pulls to ground during faults - enabling safe multi-rail sequencing in FPGA or DSP power systems without additional supervision ICs.
Does LT8608IMSE#TRPBF require an external bootstrap capacitor, and what value is recommended?
Yes - LT8608IMSE#TRPBF requires a 0.1µF ceramic capacitor between BST and SW pins, placed as close as possible to the IC. This capacitor supplies gate drive voltage for the high-side NMOS switch. X7R or C0G dielectrics are recommended; series resistance must be minimized to ensure reliable 100% duty-cycle operation and prevent bootstrap depletion under heavy load.
LT8608IMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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):
- 3V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.778V
- Voltage - Output (Max):
- 42V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 200kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT8608IMSE#TRPBF FAQ
1.How can I place an order for LT8608IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8608IMSE#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 LT8608IMSE#TRPBF reliable?
The price and inventory of LT8608IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8608IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8608IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8608IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8608IMSE#TRPBF?
LT8608IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8608IMSE#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 LT8608IMSE#TRPBF?
For technical support, including LT8608IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8608IMSE#TRPBF requirements.
6.How does Aetrix verify that LT8608IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8608IMSE#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 LT8608IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8608IMSE#TRPBF?
All LT8608IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8608IMSE#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 LT8608IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT8608IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8608IMSE#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…
