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Analog Devices Inc. LT8608HMSE#PBF
- Part No.:
- LT8608HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8608HMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,528
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Product details
Overview
LT8608HMSE#PBF from Analog Devices is a 42V, 1.5A synchronous step-down regulator with 2.5µA quiescent current in Burst Mode, peak current mode control, and internal compensation. It delivers continuous 1.5A output, supports 3.0V–42V input, and maintains <10mVP-P output ripple - ideal for automotive infotainment power rails requiring ultra-low IQ and high EMI immunity.
For engineers reviewing the LT8608HMSE#PBF datasheet, LT8608HMSE#PBF pinout, LT8608HMSE#PBF application, or LT8608HMSE#PBF equivalent, key selection criteria include guaranteed 150°C junction operation, 35ns minimum on-time, 200kHz–2.2MHz programmable switching frequency, and MSOP-10 package with SYNC/TR/SS pins for spread-spectrum EMI reduction and soft-start/tracking control.
Technical Context
The LT8608HMSE#PBF 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., 36V→3.3V), while frequency foldback during start-up prevents inductor current runaway when VOUT is low.
SYNC and TR/SS pins are exclusive to the MSOP package: SYNC selects Burst Mode (grounded), pulse-skipping (floating), or spread-spectrum modulation (tied to 3.2V–5V); TR/SS provides soft-start ramping and output voltage tracking via external capacitor or voltage source.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports cold-crank automotive (4.5V) and load-dump (42V) transients without external protection. |
| Quiescent Current | 2.5µA at no load (12VIN→3.3VOUT) - enables >1-year battery life in always-on vehicle modules. |
| Output Current | 1.5A continuous - sustains full load at TJ = 150°C with proper PCB thermal design (exposed pad soldered). |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows 2.2µH inductor at 2MHz for compact 5V/1.5A solutions. |
| Feedback Reference | 0.778V ±12mV (±1.5%) - sets output accuracy; 1% FB resistors yield ±2% total VOUT tolerance over temp. |
| PG Accuracy | ±8.5% of VFB - signals valid regulation at VOUT = 0.712V–0.844V for 3.3V output, enabling safe system boot sequencing. |
| EN/UV Threshold | 1.05V (rising), 1.00V (falling) - allows precise VIN undervoltage lockout (e.g., 9V cutoff via resistor divider). |
Pinout & Package
LT8608HMSE#PBF uses a 10-lead plastic MSOP package with exposed thermal pad (Pin 11 = GND). The exposed pad must be soldered to PCB ground plane for θJA = 40°C/W and reliable 150°C operation.
| 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 in layout to reduce EMI and prevent false triggering of current sense. |
| INTVCC | Internal 3.5V regulator output (20mA max) | Bypass with ≥1µF low-ESR ceramic to GND; no external loading permitted - powers gate drivers and logic. |
| RT | Resistor-based oscillator frequency programming | RT-to-GND sets fSW; e.g., 18.2kΩ yields 2.0MHz - enables optimization of inductor size vs. efficiency trade-off. |
| SYNC | External clock synchronization / mode selection | Ground = Burst Mode; float = pulse-skipping; 3.2–5V = spread-spectrum - no SYNC pin in DFN variants. |
| EN/UV | Enable and input undervoltage lockout control | Hysteretic 1.05V/1.00V threshold; resistor divider from VIN sets custom UVLO point (e.g., 6.5V cutoff). |
| PG | Power good open-drain flag | Pulls low if VFB deviates >±8.5% or fault occurs; valid only when VIN > 3.2V - used for downstream supply sequencing. |
| TR/SS | Soft-start and output voltage tracking input | 2µA internal pull-up enables capacitor-based ramp rate; voltage below 0.778V forces FB to track TR/SS - supports supply rail sequencing. |
| FB | Feedback input referenced to 0.778V internal bandgap | Connects to resistor divider tap; 10pF phase-lead cap recommended with high-value dividers to stabilize loop. |
| VIN | Main input power supply (3.0–42V) | Must be locally bypassed with low-ESR capacitor; positive terminal placed adjacent to VIN pins to minimize loop inductance. |
| GND | Power and signal ground (exposed pad) | Exposed pad (Pin 11) is GND - mandatory solder connection to PCB ground plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode | 2.5µA input current at no load preserves battery life in always-on systems without sacrificing <10mVP-P ripple. |
| Spread-spectrum modulation | Reduces peak EMI by up to 20dB via 0.5–6kHz frequency dithering - eliminates need for external EMI filters in automotive designs. |
| 35ns minimum on-time | Enables 36V→3.3V conversion at 2MHz without pulse skipping - maintains high efficiency and small solution size. |
| Internal compensation | Eliminates external compensation components; supports stable operation with 2.2µH inductors and standard ceramic output caps. |
| 150°C guaranteed operation | LT8608H grade qualified for full -40°C to +150°C junction range - suitable for under-hood automotive applications without derating. |
| Programmable soft-start & tracking | TR/SS pin enables controlled VOUT ramp rate and coordination with other supplies - prevents inrush current and ensures deterministic boot. |
Applications
| Automotive Infotainment | ADAS Camera Power |
|---|---|
|
Use Scenario: Powering DSP, FPGA, and display controllers in head units with cold-crank (4.5V) and load-dump (42V) survivability. IC Role / Device Role / Timing Role: Primary 5V/1.5A buck converter with programmable UVLO and PG signaling for system reset coordination. Use Value: 2.5µA IQ extends battery standby time; 150°C rating avoids thermal derating near engine bay heat sources. |
Use Scenario: Generating clean 3.3V rail for CMOS image sensors and SerDes links in rear-view and surround-view cameras. IC Role / Device Role / Timing Role: Low-noise, low-ripple power stage with spread-spectrum EMI reduction to meet CISPR-25 Class 5 limits. Use Value: <10mVP-P ripple prevents sensor pattern noise; 35ns min on-time supports 12V→3.3V at 2MHz for compact camera module PCBs. |
| Industrial IoT Sensors | Railway Control Systems |
|
Use Scenario: Long-life battery-powered wireless sensor nodes requiring multi-year operation on primary Li-SOCl₂ cells. IC Role / Device Role / Timing Role: Always-on 3.3V regulator with ultralow IQ and precise enable threshold for wake-on-event functionality. Use Value: 2.5µA no-load current enables >10-year shelf life; EN/UV hysteresis prevents oscillation during brown-out conditions. |
Use Scenario: Powering microcontrollers and CAN transceivers in train door control units exposed to wide ambient (-40°C to +85°C) and rail voltage spikes. IC Role / Device Role / Timing Role: Robust 24V→5V/3.3V converter with 42V absolute max rating and PG flag for watchdog-triggered fail-safe shutdown. Use Value: Guaranteed 150°C operation accommodates enclosure heating; ±8.5% PG window ensures reliable system-level power sequencing. |
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 |
|---|---|---|---|
| LT8609SJMSE#PBF | Same 42V/1.5A rating but adds integrated MOSFET drivers for external high-current stages; 2.8µA IQ; 12-lead MSOP. | Targeted at higher-output-current hybrid designs (e.g., 1.5A base + 3A boost); not drop-in compatible due to extra pins and different pinout. | Select LT8609SJMSE#PBF only when cascaded or paralleled external FETs are required - not for direct replacement. |
| MPQ4420AGL-AEC1-Z | 45V/2A AEC-Q200 qualified buck; 17µA IQ; no SYNC/TR/SS pins; 8-pin QFN; fixed 2.2MHz fSW. | Designed for cost-sensitive automotive body electronics; lacks programmable frequency, soft-start, and spread-spectrum EMI reduction. | Choose MPQ4420AGL-AEC1-Z for non-critical, high-volume applications where 17µA IQ and fixed frequency are acceptable trade-offs. |
Compared with LT8609SJMSE#PBF and MPQ4420AGL-AEC1-Z, the LT8608HMSE#PBF uniquely balances ultralow 2.5µA IQ, 150°C operation, and full feature set (SYNC/TR/SS/PG) in a compact 10-lead MSOP - making it optimal for space-constrained, thermally demanding automotive and industrial applications where EMI and battery life are critical.
Availability
LT8608HMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial IoT sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8608HMSE#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 precision instrumentation, industrial automation, and automotive safety markets.
The LT8608 family is designed for high-efficiency, ultralow-quiescent-current DC/DC conversion in harsh environments - specifically targeting automotive, industrial, and battery-powered systems needing robust 42V input tolerance and sub-3µA standby current.
FAQ
What is the maximum junction temperature specification for LT8608HMSE#PBF?
The LT8608HMSE#PBF is guaranteed to operate over a junction temperature range of –40°C to +150°C. This H-grade qualification ensures reliable performance in under-hood automotive locations and high-ambient industrial enclosures without thermal derating. The exposed pad (Pin 11) must be soldered to a thermal pad on the PCB to achieve θJA = 40°C/W and sustain 1.5A continuous output at 150°C.
Does LT8608HMSE#PBF support spread-spectrum frequency modulation?
Yes, LT8608HMSE#PBF supports spread-spectrum modulation when the SYNC pin is tied to a voltage between 3.2V and 5.0V. This modulates the switching frequency by ±10% at 0.5–6kHz, reducing peak EMI emissions by up to 20dB - a key advantage over fixed-frequency alternatives in CISPR-25-compliant automotive designs.
How does the EN/UV pin function on LT8608HMSE#PBF?
The EN/UV pin on LT8608HMSE#PBF has a precise 1.05V rising and 1.00V falling threshold with 50mV hysteresis. It enables both enable/disable control and programmable input undervoltage lockout: tying a resistor divider from VIN to EN/UV sets custom UVLO (e.g., 6.5V cutoff), while pulling EN/UV low shuts down the IC to 1µA input current.
Can LT8608HMSE#PBF operate at 2MHz with a 36V input and 3.3V output?
Yes, LT8608HMSE#PBF can operate at 2MHz with 36VIN→3.3VOUT thanks to its 35ns minimum on-time. At this ratio (D ≈ 9%), the device remains in continuous conduction mode without pulse skipping, maintaining high efficiency and predictable EMI behavior - confirmed by typical performance plots in the datasheet (Fig. G14, G17).
What is the purpose of the TR/SS pin on LT8608HMSE#PBF?
The TR/SS pin on LT8608HMSE#PBF provides dual functionality: soft-start control via an external capacitor (2µA internal pull-up sets slew rate), and output voltage tracking by forcing FB to follow TR/SS voltage when below 0.778V. This enables coordinated power-up sequencing with other regulators in multi-rail systems - a capability absent in DFN-package variants.
LT8608HMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT8608HMSE#PBF FAQ
1.How can I place an order for LT8608HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8608HMSE#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 LT8608HMSE#PBF reliable?
The price and inventory of LT8608HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8608HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8608HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8608HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8608HMSE#PBF?
LT8608HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8608HMSE#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 LT8608HMSE#PBF?
For technical support, including LT8608HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8608HMSE#PBF requirements.
6.How does Aetrix verify that LT8608HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8608HMSE#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 LT8608HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8608HMSE#PBF?
All LT8608HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8608HMSE#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 LT8608HMSE#PBF part is unused and in its original packaging.
Return procedure for LT8608HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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