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Analog Devices Inc. LT8604CAV#TRMPBF
- Part No.:
- LT8604CAV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LT8604CAV#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 120MA 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:797
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Product details
Overview
LT8604CAV#TRMPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 120mA output at up to 2.2MHz switching frequency, with 42V max input, 2.5µA quiescent current in Burst Mode, and ±7.5% power-good accuracy. It serves as a compact housekeeping supply in automotive and industrial sensor systems requiring high efficiency at light loads.
For engineers reviewing the LT8604CAV#TRMPBF datasheet, LT8604CAV#TRMPBF pinout, LT8604CAV#TRMPBF application, or LT8604CAV#TRMPBF equivalent, key selection criteria include its 12-lead LQFN package, SYNC/MODE pin programmability (Burst/FCM/Spread Spectrum/Sync), internal BST/INTVCC capacitors, 35ns minimum on-time, and AEC-Q100-compliant temperature range (–40°C to 125°C).
Technical Context
The LT8604CAV#TRMPBF implements constant-frequency current-mode control with integrated top/bottom NMOS switches, internal 0.778V reference, and slope-compensated PWM. Its oscillator supports 200kHz–2.2MHz via RT resistor or external clock synchronization.
It features four distinct operating modes selected by the SYNC/MODE pin: Burst Mode (ultralow IQ), Forced Continuous Mode (fast transient response, negative inductor current allowed), Spread Spectrum (EMI reduction), and external clock sync (predictable timing for high-resolution acquisition). The HYST pin enables adjustable EN/UV hysteresis for robust input UVLO behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.2V to 42V - supports wide automotive battery and industrial bus rails without pre-regulation. |
| Max Output Current | 120mA - sufficient for powering microcontrollers, sensors, and signal chains in space-constrained modules. |
| Switching Frequency | 200kHz to 2.2MHz - programmable via RT pin or external clock; enables small magnetics and noise avoidance in sensitive bands. |
| Quiescent Current | 2.5µA at 24VIN → 3.3VOUT - enables multi-year battery life in always-on IoT nodes and low-power telemetry. |
| Feedback Reference | 0.778V ±1.6% - precise internal reference enabling accurate output regulation with minimal external resistor tolerance impact. |
| Min On-Time | 35ns - allows high VIN-to-low VOUT conversion (e.g., 42V→3.3V) at 2.2MHz without pulse-skipping instability. |
| Power-Good Threshold | ±7.5% of VOUT - provides reliable system reset signaling with defined fault detection window. |
Pinout & Package
LT8604CAV#TRMPBF uses a 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed thermal pad (Pin 13 = GND). Pin count and layout are optimized for minimal PCB area and thermal resistance (θJA = 51°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main input power supply | Supplies internal circuitry and top switch; requires local ceramic bypass to minimize voltage ripple and EMI. |
| EN/UV (Pin 2) | Enable / input undervoltage lockout | Hysteretic threshold (1.04V rising / 1.00V falling); enables controlled startup and brownout protection. |
| HYST (Pin 3) | EN/UV hysteresis control | Open-drain output pulled low when EN/UV < 1V; allows external RC network to set custom UVLO hysteresis. |
| PG (Pin 4) | Power-good flag | Open-drain output asserted high only when VOUT is within ±7.5% of target and no fault is present. |
| FB (Pin 5) | Feedback input | Regulated to 0.778V; connects to resistor divider to set output voltage; high-impedance (±20nA) minimizes divider error. |
| TR/SS (Pin 6) | Soft-start and tracking | Internal 2µA pull-up enables capacitor-programmed slew rate; supports output voltage sequencing with other rails. |
| SYNC/MODE (Pin 7) | Operating mode selection | Selects Burst Mode (GND), FCM (floating), Spread Spectrum (≥3V), or external sync (AC-coupled clock). |
| RT (Pin 8) | Frequency setting | Resistor-to-ground sets oscillator frequency; supports 200kHz–2.2MHz range with tight tolerance. |
| BIAS (Pin 9) | Bias supply input | Reduces IQ by sourcing internal regulators from VOUT (if ≥3.3V); improves efficiency over full load range. |
| SW (Pin 10) | Switch node | Connects to inductor; high dv/dt node requiring minimized trace area and tight layout for EMI control. |
| DNC (Pin 11) | No-connect | Must remain unconnected; no internal connection or function. |
| GND (Pins 12 & 13) | Ground reference and thermal path | Exposed pad (Pin 13) must be soldered to PCB ground plane for thermal performance and EMI suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated BST and INTVCC capacitors | Eliminates two external 47nF/1µF ceramics, reducing BOM count and board area in space-critical designs. |
| Four selectable operating modes | Enables trade-off tuning: Burst Mode (lowest IQ), FCM (best transient response), Spread Spectrum (EMI compliance), Sync (timing coherence). |
| Adjustable EN/UV hysteresis via HYST pin | Allows precise, application-specific UVLO window without external comparators or resistors. |
| Internal compensation | Removes need for external compensation network, simplifying design and improving stability across component tolerances. |
| Output soft-start and tracking | Prevents inrush current and enables coordinated power-up with multiple rails using single TR/SS capacitor. |
Applications
| Automotive Housekeeping Supply | Industrial Sensor Node |
|---|---|
|
Use Scenario: Powering CAN transceiver, MCU, and analog front-end in automotive body control module with 12V/24V battery input. IC Role / Device Role / Timing Role: Primary 3.3V/5V housekeeping regulator providing stable, low-noise bias under cold-crank (6V) and load-dump (42V) conditions. Use Value: 2.5µA quiescent current extends battery life during vehicle sleep; ±7.5% PG ensures safe MCU reset; AEC-Q100 qualification validates reliability. |
Use Scenario: Supplying ultra-low-power pressure and temperature sensors in wireless IIoT field transmitter with coin-cell or energy-harvesting source. IC Role / Device Role / Timing Role: Efficient step-down converter enabling direct 12–24V industrial bus operation while maintaining sub-µA standby draw. Use Value: Burst Mode delivers >85% efficiency at 100µA load; 35ns min on-time supports 42V→3.3V conversion at 2MHz; small LQFN fits inside IP67 enclosure. |
| 4–20mA Loop-Powered Transmitter | Flow Meter Electronics |
|
Use Scenario: Generating regulated 3.3V rail for ADC, microcontroller, and HART modem in loop-powered field instrument. IC Role / Device Role / Timing Role: High-efficiency buck converter operating from limited loop current budget (≤4mA) with minimal dropout. Use Value: 2.5µA IQ reduces burden on loop supply; internal BIAS connection to VOUT lowers total input current; 120mA output headroom supports digital comms bursts. |
Use Scenario: Powering ultrasonic time-of-flight measurement circuitry and display driver in battery-operated portable flow meter. IC Role / Device Role / Timing Role: Compact, low-EMI power source enabling clean analog measurements and long battery life between calibrations. Use Value: Spread Spectrum mode reduces conducted EMI peaks below CISPR-22 Class B limits; SYNC/MODE pin allows EMI testing at fixed frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8603CAV#TRMPBF | Same LQFN package, 3.3V fixed output (non-adjustable), no RT or FB pins; lacks SYNC/MODE and HYST. | Targeted at cost-sensitive, fixed-voltage applications where programmability and mode control are unnecessary. | Select LT8603CAV#TRMPBF only if output voltage is fixed at 3.3V and Burst Mode suffices-no FCM or spread spectrum required. |
| LT8609SAV#TRMPBF | Higher 300mA output, same 42V input, identical LQFN-12 package, but adds spread-spectrum-only SYNC pin (no FCM/Burst select). | Suitable for higher-current sensor hubs or dual-rail systems needing more drive capability but less operational flexibility. | Choose LT8609SAV#TRMPBF when >120mA is needed and spread-spectrum EMI reduction is primary-no requirement for Burst/FCM mode switching. |
Compared with LT8603CAV#TRMPBF and LT8609SAV#TRMPBF, the LT8604CAV#TRMPBF uniquely balances programmable output voltage, full mode selection (Burst/FCM/Spread/Sync), and 120mA capability in the smallest footprint-making it optimal for flexible, low-power, EMI-sensitive embedded systems.
Availability
LT8604CAV#TRMPBF is available at Aetrix Electronics and suitable for automotive housekeeping supplies, industrial sensor nodes, and 4–20mA loop-powered transmitters requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LT8604CAV#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 industrial, automotive, communications, and healthcare markets.
The LT8604/LT8604C product line was designed specifically for space-constrained, high-input-voltage applications demanding ultralow quiescent current, fast transient response, and EMI-robust operation-targeting automotive subsystems and precision industrial sensors.
FAQ
What is the maximum input voltage rating for the LT8604CAV#TRMPBF?
The LT8604CAV#TRMPBF has an absolute maximum input voltage rating of 42V, with guaranteed operation across 3.2V to 42V. This enables direct connection to automotive batteries (including load-dump transients) and industrial 24V/36V buses without external clamping or pre-regulation stages.
Does the LT8604CAV#TRMPBF support forced continuous mode (FCM)?
Yes, the LT8604CAV#TRMPBF supports forced continuous mode via its SYNC/MODE pin: floating the pin enables FCM, which maintains constant switching frequency and allows negative inductor current for superior load-step transient response-critical in real-time sensor and control applications.
How does the HYST pin function on the LT8604CAV#TRMPBF?
The HYST pin on the LT8604CAV#TRMPBF is an open-drain output pulled low when the EN/UV pin voltage falls below 1V. It enables precise, externally adjustable hysteresis for the enable threshold-allowing robust UVLO behavior without additional components in battery-backed or variable-input systems.
What is the purpose of the internal BST and INTVCC capacitors in the LT8604CAV#TRMPBF?
The LT8604CAV#TRMPBF integrates a 47nF BST capacitor and 1µF INTVCC bypass capacitor internally. These eliminate two external ceramic components, reduce PCB area by ~1.5mm², improve reliability by removing solder joints, and simplify layout-especially beneficial in miniaturized automotive and medical sensor modules.
Can the LT8604CAV#TRMPBF be synchronized to an external clock?
Yes, the LT8604CAV#TRMPBF can be synchronized to an external clock applied to the SYNC/MODE pin. When driven with a clean AC-coupled signal, the device locks to the external frequency and operates in forced continuous mode-enabling deterministic timing for high-resolution data acquisition and EMI spectral shaping.
LT8604CAV#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- 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):
- 2.9V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.778V
- Voltage - Output (Max):
- 42V
- Current - Output:
- 120mA
- 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 (2x2)
LT8604CAV#TRMPBF FAQ
1.How can I place an order for LT8604CAV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8604CAV#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 LT8604CAV#TRMPBF reliable?
The price and inventory of LT8604CAV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8604CAV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8604CAV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8604CAV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8604CAV#TRMPBF?
LT8604CAV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8604CAV#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 LT8604CAV#TRMPBF?
For technical support, including LT8604CAV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8604CAV#TRMPBF requirements.
6.How does Aetrix verify that LT8604CAV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8604CAV#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 LT8604CAV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8604CAV#TRMPBF?
All LT8604CAV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8604CAV#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 LT8604CAV#TRMPBF part is unused and in its original packaging.
Return procedure for LT8604CAV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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