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Analog Devices Inc. LT8608BIDC#TRMPBF
- Part No.:
- LT8608BIDC#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8608BIDC#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:150
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Product details
Overview
LT8608BIDC#TRMPBF from Analog Devices is a 42V, 1.5A synchronous step-down regulator in an 8-lead 2mm × 2mm DFN package, featuring pulse-skipping mode, 2.5µA quiescent current at no load (12VIN→3.3VOUT), <10mVP-P output ripple, and internal compensation for fast transient response. It delivers regulated power to low-power industrial sensors and automotive body electronics requiring ultralow IQ and wide input range.
For engineers reviewing the LT8608BIDC#TRMPBF datasheet, LT8608BIDC#TRMPBF pinout, LT8608BIDC#TRMPBF application, or LT8608BIDC#TRMPBF equivalent, key selection criteria include confirmed pulse-skipping operation (not Burst Mode), fixed 8-pin DFN footprint, 0.773–0.783V FB reference, 35ns minimum on-time, and absence of SYNC/TR/SS pins - critical for EMI-sensitive battery-powered systems.
Technical Context
The LT8608BIDC#TRMPBF implements peak current mode control with internal compensation, enabling stable operation with small external components and fast load-step response. Its pulse-skipping mode maintains continuous oscillator operation and clock-aligned switching, differing fundamentally from Burst Mode's sleep-cycle architecture.
Unlike the MSOP variants, this DFN variant permanently disables SYNC and TR/SS functionality: SYNC is internally floated (enabling pulse-skipping), and TR/SS is omitted entirely. The FB pin regulates to 0.778V (typ) with ±0.02%/V line regulation, and PG asserts when VOUT deviates >±8.5% from regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports direct connection to automotive battery (cold-crank down to 3.2V) without pre-regulation |
| Quiescent Current | 2.5µA at no load (12VIN→3.3VOUT) - enables >10-year battery life in always-on IoT nodes |
| Output Ripple | <10mVP-P - meets stringent analog sensor and RF front-end noise requirements |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows trade-off between inductor size (e.g., 2.2µH @ 2MHz) and efficiency |
| Feedback Reference | 0.773V to 0.783V (DFN, –40°C to 125°C) - ensures ±1.3% output accuracy with 1% resistors |
| Min On-Time | 35ns - enables high VIN/VOUT ratios (e.g., 42V→3.3V) without frequency foldback |
| Continuous Output | 1.5A - sustains full load at TJ ≤ 125°C with proper PCB thermal design (exposed pad soldered) |
Pinout & Package
LT8608BIDC#TRMPBF uses an 8-lead, 2mm × 2mm plastic DFN package with exposed thermal pad (Pin 9 = GND). The package omits SYNC and TR/SS pins present in MSOP variants; all functionality is factory-configured for pulse-skipping operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply for high-side NMOS gate drive | Requires 0.1µF ceramic capacitor directly to SW; no series resistor allowed |
| SW | Switch node connecting internal top/bottom FETs to inductor | Must be minimized on PCB layout to reduce EMI and switching losses |
| INTVCC | Internal 3.5V regulator output | Bypass with ≥1µF low-ESR ceramic; no external loading permitted |
| RT | Resistor-based oscillator frequency programming | RT-to-GND sets fSW; value determines inductor size and efficiency trade-off |
| EN/UV | Enable and input undervoltage lockout input | 1.05V rising threshold enables shutdown below VIN min; 50mV hysteresis prevents chatter |
| VIN | Main input power supply | Must be locally bypassed with low-ESR capacitor; connects to internal power switches and bias circuitry |
| PG | Open-drain power-good flag | Pulls low if VOUT deviates >±8.5% or fault occurs; valid only when VIN > 3.2V |
| FB | Feedback voltage sense input | Regulated to 0.778V; resistor divider from VOUT sets output voltage with minimal current draw |
Key Features
| Feature | Design Value |
|---|---|
| Pulse-skipping operation (fixed) | Guarantees continuous oscillator activity and clock-aligned switching - eliminates Burst Mode's low-frequency ripple artifacts in noise-sensitive applications |
| Ultralow 2.5µA quiescent current | Enables multi-year operation from coin-cell batteries in wireless sensor nodes without compromising start-up time or regulation accuracy |
| 35ns minimum on-time | Supports high step-down ratios (e.g., 42V→3.3V at 2MHz) without requiring frequency reduction or external components |
| Integrated top/bottom power switches | Eliminates need for external MOSFETs and drivers; 350mΩ top / 230mΩ bottom RDS(ON) minimizes conduction loss at 1.5A |
| Internal compensation | Reduces BOM count by removing external compensation network; enables stable operation with standard 2.2µH inductors and 47µF output capacitors |
Applications
| Automotive Body Control Module (BCM) | Industrial Wireless Sensor Node |
|---|---|
Use Scenario: Powering LIN transceivers, door lock actuators, and ambient light sensors from 12V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary 3.3V/5V point-of-load regulator delivering 1.5A peak during actuator pulses while maintaining <2.5µA sleep current. Use Value: Eliminates need for external UVLO circuitry; 42V absolute max rating survives load-dump transients up to 40V. | Use Scenario: Supplying ultra-low-power MCU, sub-GHz RF transceiver, and MEMS accelerometer in battery-operated predictive maintenance sensor. IC Role / Device Role / Timing Role: Always-on buck converter regulating 3.3V from primary Li-SOCl₂ cell with intermittent 100ms transmit bursts. Use Value: 2.5µA IQ extends 2500mAh cell life to >12 years; pulse-skipping avoids low-frequency EMI that corrupts RF reception. |
| Medical Portable Diagnostic Device | Avionics Cabin Monitoring Unit |
Use Scenario: Powering precision ADCs, op-amps, and Bluetooth LE radio in handheld ultrasound probe with strict EMI limits. IC Role / Device Role / Timing Role: Low-noise 5V supply stage preceding LDOs, operating at 2MHz to shift switching harmonics above sensitive analog bands. Use Value: <10mVP-P ripple meets IEC 60601-1 conducted emission requirements; spread-spectrum not needed due to fixed pulse-skipping behavior. | Use Scenario: Regulating 3.3V for cabin pressure/temperature sensors and CAN interface in certified aircraft subsystems. IC Role / Device Role / Timing Role: DO-160G-compliant DC/DC converter supporting –40°C to 125°C junction temperature with no derating. Use Value: Guaranteed 1.5A output at 125°C enables compact heatsink-free design; PG flag provides system-level fault reporting to flight controller. |
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 |
|---|---|---|---|
| LT8608EDC#TRMPBF | Burst Mode operation (SYNC internally grounded); identical pinout and package | Lower IQ (1.7µA typ) but higher low-load ripple; unsuitable where pulse alignment is required | Select when lowest possible standby current outweighs EMI concerns |
| LT8609SIDD#TRMPBF | Higher 2A output, integrated spread-spectrum, same DFN-8 package, but 0.8V FB reference | Supports higher current loads and stricter CISPR-25 Class 5 EMI; requires FB resistor recalculations | Select when future-proofing for 2A peak loads or automotive EMI certification is mandatory |
Compared with LT8608EDC#TRMPBF, the LT8608BIDC#TRMPBF trades lower quiescent current for deterministic pulse timing and reduced low-frequency EMI; compared with LT8609SIDD#TRMPBF, it offers proven reliability at lower cost and simpler design, but lacks spread-spectrum and headroom for >1.5A loads.
Availability
LT8608BIDC#TRMPBF is available at Aetrix Electronics and suitable for automotive body electronics, industrial wireless sensors, portable medical diagnostics, and avionics monitoring systems requiring stable component supply across extended temperature ranges.
Supply support for LT8608BIDC#TRMPBF 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 industrial, automotive, communications, and healthcare markets.
The LT8608/LT8608B product line delivers ultralow-quiescent-current synchronous buck regulators for battery-powered and energy-harvesting applications where long operational life and wide input voltage range are critical.
FAQ
What distinguishes LT8608BIDC#TRMPBF from the standard LT8608 DFN variant?
The LT8608BIDC#TRMPBF is factory-configured for pulse-skipping mode, whereas the LT8608 DFN (e.g., LT8608EDC#TRMPBF) operates in Burst Mode. This means LT8608BIDC#TRMPBF maintains continuous oscillator operation and clock-aligned switching, resulting in higher light-load quiescent current (~several hundred µA vs. 1.7µA) but eliminating low-frequency ripple artifacts. The LT8608BIDC#TRMPBF has no SYNC pin - it is internally floated to enable pulse-skipping.
Does LT8608BIDC#TRMPBF support external synchronization or soft-start?
No. LT8608BIDC#TRMPBF does not support external synchronization or soft-start/tracking functions. The SYNC and TR/SS pins are omitted from the 8-lead DFN package. Pulse-skipping mode is fixed at manufacture; soft-start is implemented via internal circuitry only and cannot be externally programmed. For designs requiring synchronization or adjustable soft-start, the MSOP variants (e.g., LT8608IMSE#TRPBF) must be used instead of LT8608BIDC#TRMPBF.
What is the guaranteed feedback reference voltage range for LT8608BIDC#TRMPBF over temperature?
The LT8608BIDC#TRMPBF guarantees a feedback reference voltage of 0.773V (min) to 0.783V (max) across the full –40°C to 125°C junction temperature range. This 10mV window corresponds to ±1.3% accuracy relative to the typical 0.778V reference, enabling precise output voltage setting using standard 1% feedback resistors without trimming.
Can LT8608BIDC#TRMPBF operate reliably at 42V input with full 1.5A output?
Yes. LT8608BIDC#TRMPBF is rated for 42V absolute maximum input and delivers 1.5A continuous output current at TJ ≤ 125°C when the exposed thermal pad is properly soldered to a sufficient copper area. At 42VIN/3.3VOUT, efficiency drops to ~82% (measured at 0.5A), but thermal performance remains within spec with adequate PCB copper pour and airflow. The 35ns minimum on-time prevents frequency foldback under these conditions.
How does the power-good (PG) flag behave during startup and fault conditions for LT8608BIDC#TRMPBF?
The PG pin on LT8608BIDC#TRMPBF is an open-drain output that remains low until VOUT reaches and stabilizes within ±8.5% of the programmed regulation voltage, and no fault (e.g., overtemperature, short-circuit) is detected. PG is valid only when VIN exceeds 3.2V - it does not assert during undervoltage lockout. During startup, PG transitions high after soft-start completes and output settles; during faults, PG pulls low immediately and stays low until the condition clears and regulation resumes.
LT8608BIDC#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN 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 ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LT8608BIDC#TRMPBF FAQ
1.How can I place an order for LT8608BIDC#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8608BIDC#TRMPBF 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 LT8608BIDC#TRMPBF reliable?
The price and inventory of LT8608BIDC#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8608BIDC#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8608BIDC#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8608BIDC#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8608BIDC#TRMPBF?
LT8608BIDC#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8608BIDC#TRMPBF 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 LT8608BIDC#TRMPBF?
For technical support, including LT8608BIDC#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8608BIDC#TRMPBF requirements.
6.How does Aetrix verify that LT8608BIDC#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8608BIDC#TRMPBF 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 LT8608BIDC#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8608BIDC#TRMPBF?
All LT8608BIDC#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8608BIDC#TRMPBF, 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 LT8608BIDC#TRMPBF part is unused and in its original packaging.
Return procedure for LT8608BIDC#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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