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Analog Devices Inc. LT8608BEDC#TRMPBF
- Part No.:
- LT8608BEDC#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8608BEDC#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:763
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Product details
Overview
LT8608BEDC#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 operation, 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 in automotive infotainment and industrial sensor nodes where low standby power and compact size are critical.
For engineers reviewing the LT8608BEDC#TRMPBF datasheet, LT8608BEDC#TRMPBF pinout, LT8608BEDC#TRMPBF application, or LT8608BEDC#TRMPBF equivalent, this page provides verified technical context, exact pin functions, real-world efficiency curves, confirmed alternative options with documented functional differences, and supply-chain support details specific to the –40°C to 125°C grade DFN variant.
Technical Context
The LT8608BEDC#TRMPBF implements peak current mode control with internal compensation, enabling stable operation using small external inductors (e.g., 2.2µH) and achieving fast load transient response. Its fixed 35ns minimum on-time supports high VIN/VOUT ratios while maintaining regulation down to 3.0V input.
This DFN variant omits SYNC and TR/SS pins and is factory-configured for pulse-skipping mode-unlike the MSOP version-yielding higher light-load IQ (~hundreds of µA) but full-frequency operation at lower loads and no spread-spectrum capability. The FB reference is trimmed to 0.778V (±1.8% over temperature) with ±20nA input bias current.
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. |
| Output Current | 1.5A continuous - sufficient for powering microcontrollers, FPGAs, or multiple sensors from a single rail. |
| Quiescent Current | 2.5µA at no load (12VIN → 3.3VOUT) - enables >10-year battery life in always-on IoT endpoints. |
| Feedback Reference | 0.778V (DFN grade) - sets output voltage accuracy; 1% resistors yield ±1.2% total VOUT error. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows trade-off between inductor size (e.g., 2.2µH @ 2MHz) and efficiency. |
| Output Ripple | <10mVP-P in Burst Mode - meets noise-sensitive analog circuit requirements without additional LDO post-regulation. |
| Enable Threshold | 1.05V (rising), 50mV hysteresis - permits precise VIN undervoltage lockout via resistor divider. |
Pinout & Package
LT8608BEDC#TRMPBF uses an 8-lead, 2mm × 2mm plastic DFN package with exposed thermal pad (GND). The package has no SYNC or TR/SS pins; pulse-skipping mode is hardwired internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply for high-side NMOS gate drive | Requires 0.1µF ceramic capacitor to SW; no series resistor allowed-critical for 100% duty-cycle capability. |
| SW | Switch node connecting internal top/bottom FETs to inductor | High di/dt node; must be minimized on PCB to reduce EMI and switching losses. |
| INTVCC | Internal 3.5V regulator output (20mA max) | Bypass with ≥1µF low-ESR ceramic to GND; no external loading permitted. |
| RT | Resistor-based oscillator frequency programming | Connect to GND with precision resistor (e.g., 18.2kΩ for 2MHz); sets min/max fSW range. |
| EN/UV | Enable and input undervoltage lockout control | Hysteretic 1.05V/1.00V threshold; tie to VIN if always-on, or use divider for programmable UVLO. |
| VIN | Main input power supply (3.0–42V) | Must be locally bypassed with low-ESR capacitor; positive terminal placed adjacent to VIN pin. |
| PG | Open-drain Power Good flag | Pulls low when VOUT deviates >±8.5% from setpoint or fault occurs; valid above 3.2V VIN. |
| FB | Feedback input for output voltage regulation | Regulated to 0.778V; connects to resistor divider tap-divider current directly impacts light-load IQ. |
| GND | Power and signal ground (exposed pad) | Exposed pad must be soldered to PCB ground plane for thermal performance (θJA = 60°C/W typical). |
Key Features
| Feature | Design Value |
|---|---|
| Pulse-skipping mode (DFN-B variant) | Enables full-frequency operation at light loads vs. Burst Mode-reducing output voltage step changes during load transients. |
| 35ns minimum on-time | Supports high step-down ratios (e.g., 42V→3.3V) without cycle skipping, maintaining regulation under wide VIN conditions. |
| Internal compensation | Eliminates need for external compensation network-reducing BOM count and layout sensitivity while ensuring stability with 2.2µH inductors. |
| Accurate 1V EN/UV threshold | Allows reliable system-level power sequencing and brown-out protection using simple resistor dividers from VIN. |
| PG flag with ±8.5% tolerance | Provides robust power-good signaling for microcontroller reset assertion or system health monitoring without external comparators. |
Applications
| Automotive Infotainment | Industrial Sensor Node |
|---|---|
Use Scenario: Powering DSP, display controller, and CAN transceiver from 12V battery in head unit. IC Role / Device Role / Timing Role: Primary 3.3V/1.8V step-down regulator delivering clean, low-noise power with cold-crank immunity. Use Value: 2.5µA quiescent current extends battery life during vehicle sleep mode; 42V rating withstands load-dump transients. |
Use Scenario: Supplying ultra-low-power MCU, MEMS accelerometer, and LoRa transceiver in wireless condition monitor. IC Role / Device Role / Timing Role: Always-on buck converter enabling multi-year battery operation with fast wake-up response. Use Value: Pulse-skipping mode ensures consistent switching frequency during sensor sampling bursts-simplifying EMI filtering. |
| Medical Portable Monitor | Test & Measurement Equipment |
Use Scenario: Generating isolated 5V and 3.3V rails for ADC front-end and ARM Cortex-M4 processor in handheld ECG device. IC Role / Device Role / Timing Role: High-efficiency, low-ripple DC/DC stage preceding LDOs to meet stringent analog noise specs. Use Value: <10mVP-P ripple eliminates need for extra LC filtering; 2.2MHz operation allows tiny 2.2µH inductor and 4.7µF output cap. |
Use Scenario: Providing stable 5V supply to precision DACs, op-amps, and FPGA configuration circuitry in benchtop calibrator. IC Role / Device Role / Timing Role: Main system power regulator with tight line/load regulation and fast transient recovery. Use Value: Internal compensation and peak-current mode deliver <50µs recovery from 50% load step-maintaining measurement accuracy. |
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 |
|---|---|---|---|
| LT8609SDE#TRPBF | Same 42V/1.5A rating but adds spread-spectrum EMI reduction and SYNC pin; 3mm × 4mm DFN package. | Required where CISPR-25 Class 5 EMI compliance is mandatory (e.g., automotive ADAS modules). | Select LT8609SDE#TRPBF only if EMI reduction is prioritized over board area-its larger footprint offsets the benefit of integrated spread-spectrum. |
| TPS54332DDAR | 3.5–28V input, 3A output, 150µA IQ; no ultralow-IQ mode; SO-8 package. | Suitable for cost-sensitive industrial PLC I/O modules where 28V max input suffices and standby power is secondary. | Choose TPS54332DDAR for higher output current and lower BOM cost-but not for battery-powered or 42V systems. |
Compared with LT8608BEDC#TRMPBF, LT8609SDE#TRPBF offers superior EMI performance at the expense of footprint and cost, while TPS54332DDAR trades off input voltage range and quiescent current for higher output current and SO-8 manufacturability-making each suitable only for distinct design constraints.
Availability
LT8608BEDC#TRMPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor nodes, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8608BEDC#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 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 LT8608/LT8608B product line was designed specifically for high-input-voltage, ultralow-quiescent-current DC/DC conversion in space-constrained, battery-sensitive applications-emphasizing reliability under harsh electrical conditions.
FAQ
What is the guaranteed operating temperature range for LT8608BEDC#TRMPBF?
The LT8608BEDC#TRMPBF is rated for –40°C to +125°C junction temperature. This grade is validated per Analog Devices' characterization and statistical process controls, making it suitable for under-hood automotive and industrial environments where ambient temperatures exceed 85°C.
Does LT8608BEDC#TRMPBF support synchronization to an external clock?
No. The LT8608BEDC#TRMPBF is the DFN variant of the LT8608B family and does not include a SYNC pin. It is factory-configured for pulse-skipping mode only and cannot be synchronized, forced into Burst Mode, or enabled for spread-spectrum modulation.
How does the FB reference voltage of LT8608BEDC#TRMPBF differ from the MSOP version?
The LT8608BEDC#TRMPBF (DFN-B) has a nominal FB reference of 0.778V with ±1.8% variation over temperature. The MSOP version specifies 0.778V as well, but DFN variants show tighter initial tolerance due to laser trimming-confirmed in Electrical Characteristics Table on page 3 of Rev. D datasheet.
Can LT8608BEDC#TRMPBF operate with 100% duty cycle?
Yes. The LT8608BEDC#TRMPBF supports near-100% duty cycle operation by skipping switch cycles when VIN approaches VOUT, limited only by the top FET's RDS(ON). This enables dropout operation down to ~3.2V input for a 3.3V output, critical for battery-powered systems nearing end-of-life.
What is the maximum recommended output capacitance for LT8608BEDC#TRMPBF?
Analog Devices recommends ≤100µF total output capacitance for LT8608BEDC#TRMPBF to maintain loop stability with internal compensation. Typical designs use 47µF ceramic (X7R, 1206) plus optional 10µF tantalum for hold-up-exceeding 100µF may degrade phase margin and cause overshoot during load steps.
LT8608BEDC#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 ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LT8608BEDC#TRMPBF FAQ
1.How can I place an order for LT8608BEDC#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8608BEDC#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 LT8608BEDC#TRMPBF reliable?
The price and inventory of LT8608BEDC#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8608BEDC#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8608BEDC#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8608BEDC#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8608BEDC#TRMPBF?
LT8608BEDC#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8608BEDC#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 LT8608BEDC#TRMPBF?
For technical support, including LT8608BEDC#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8608BEDC#TRMPBF requirements.
6.How does Aetrix verify that LT8608BEDC#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8608BEDC#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 LT8608BEDC#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8608BEDC#TRMPBF?
All LT8608BEDC#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8608BEDC#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 LT8608BEDC#TRMPBF part is unused and in its original packaging.
Return procedure for LT8608BEDC#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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