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Analog Devices Inc. LT8604CAV#TRPBF
- Part No.:
- LT8604CAV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LT8604CAV#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 120MA 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,925
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Product details
Overview
LT8604CAV#TRPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 120mA output with 42V input capability, 2.5µA quiescent current in Burst Mode, and 35ns minimum on-time. It operates at fixed frequencies up to 2.2MHz and integrates top/bottom NMOS power switches, internal compensation, soft-start, and tracking - optimized for space-constrained industrial sensor and automotive housekeeping supplies.
For engineers reviewing the LT8604CAV#TRPBF datasheet, LT8604CAV#TRPBF pinout, LT8604CAV#TRPBF application, or LT8604CAV#TRPBF equivalent, key selection criteria include its LQFN-12 package, SYNC/MODE pin programmability (Burst/FCM/Spread Spectrum/Sync), ±7.5% PG flag accuracy, 0.778V feedback reference, and AEC-Q100-compliant temperature range (–40°C to 125°C).
Technical Context
The LT8604CAV#TRPBF implements constant-frequency current-mode control with internal slope compensation active in both Burst and Forced Continuous Modes. Its oscillator supports 200kHz–2.2MHz via RT resistor or external clock synchronization, and frequency foldback activates during startup or overcurrent to limit inductor current.
It features dual-path biasing: internal circuitry draws current from BIAS when ≥3.2V (e.g., tied to VOUT), otherwise from VIN. The HYST pin enables adjustable EN/UV hysteresis, and the SYNC/MODE pin selects among four distinct operating modes - including spread-spectrum modulation for EMI reduction - without requiring external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.2V to 42V - supports wide industrial and automotive supply rails including 24V and 36V systems. |
| Output Current | Up to 120mA - sufficient for powering microcontrollers, sensors, and analog front-ends in low-power nodes. |
| Quiescent Current | 2.5µA at 24VIN → 3.3VOUT - enables multi-year battery life in always-on IoT endpoints. |
| Switching Frequency | 200kHz to 2.2MHz - selectable via RT resistor or external clock; higher frequencies allow smaller magnetics. |
| Feedback Reference | 0.778V ±1.6% - precise regulation point enabling accurate output voltage setting with standard resistors. |
| Power Good Threshold | ±7.5% of VOUT - provides reliable system-level power sequencing and fault detection. |
| Min On-Time | 35ns - supports high VIN/VOUT ratios (e.g., 42V→3.3V) without pulse-skipping instability. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive and harsh industrial environments. |
Pinout & Package
LT8604CAV#TRPBF uses a 12-lead 2mm × 2mm LQFN package (exposed pad = GND) with 0.5mm pitch and side-wettable flanks for automated optical inspection. Pin 13 is the exposed thermal pad, soldered to PCB ground for optimal thermal performance (θJA = 51°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main input supply connection | Supplies internal circuitry and top switch; requires local ceramic bypass capacitor. |
| EN/UV (Pin 2) | Enable and undervoltage lockout input | Hysteretic threshold (1.04V rising / 1.00V falling); enables shutdown or VIN monitoring. |
| HYST (Pin 3) | EN/UV hysteresis control output | Open-drain logic output pulled low when EN/UV < 1V; allows external hysteresis adjustment. |
| PG (Pin 4) | Power good open-drain flag | Asserts high when VOUT is within ±7.5% of target and no faults exist; valid above 3.2V VIN. |
| FB (Pin 5) | Feedback voltage sensing node | Regulated to 0.778V; connects to resistor divider for output voltage programming. |
| TR/SS (Pin 6) | Tracking and soft-start control | Internal 2µA pull-up enables capacitor-programmed slew rate; supports output voltage tracking. |
| SYNC/MODE (Pin 7) | Operating mode selection | Selects Burst Mode (ground), FCM (floating), Spread Spectrum (high), or Sync (external clock). |
| RT (Pin 8) | Oscillator frequency set | Resistor-to-ground sets switching frequency from 200kHz to 2.2MHz. |
| BIAS (Pin 9) | Bias supply input | Reduces VIN current draw when tied to VOUT ≥3.2V; improves efficiency at light loads. |
| SW (Pin 10) | Switch node output | Connects directly to inductor; critical high-dI/dt node requiring minimal PCB loop area. |
| DNC (Pin 11) | No-connect terminal | Must remain unconnected; not internally bonded or functional. |
| GND (Pin 12 & Pad 13) | Power and signal ground | Exposed pad is primary thermal path; must be soldered to large PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated BST and INTVCC capacitors | Enables fully integrated, compact layout - eliminates two external ceramic capacitors required by LT8604. |
| Four-mode SYNC/MODE pin | Single-pin selection of Burst Mode, Forced Continuous Mode, Spread Spectrum, or External Clock Sync - simplifies EMI optimization and transient response tuning. |
| Adjustable EN/UV hysteresis via HYST | Allows precise, user-defined hysteresis using external resistor - avoids unstable enable/disable cycling near threshold. |
| Internal compensation and soft-start | Reduces external component count and startup overshoot; TR/SS pin enables coordinated voltage ramping across multiple rails. |
| Ultralow IQ Burst Mode | 2.5µA input current at 24VIN → 3.3VOUT no-load - extends battery runtime in always-on sensor nodes. |
| AEC-Q100 Grade 1 compliance | Qualified for automotive applications per AEC-Q100 Rev H - supports engine control, ADAS housekeeping, and infotainment subsystems. |
Applications
| Industrial Sensors | Automotive Housekeeping Supplies |
|---|---|
|
Use Scenario: Powering MEMS pressure sensors and thermistors in factory-floor condition monitoring systems. IC Role / Device Role / Timing Role: Primary 3.3V/120mA step-down regulator with ultralow quiescent current for battery-backed operation. Use Value: Enables >5-year battery life while maintaining fast wake-up response and stable output under varying load transients. |
Use Scenario: Supplying microcontrollers and CAN transceivers in vehicle body control modules. IC Role / Device Role / Timing Role: Secondary power rail generator from 12V/24V battery, supporting cold-crank down to 3.2V. Use Value: Maintains regulation during cranking events and meets AEC-Q100 temperature requirements (–40°C to 125°C). |
| 4–20mA Current Loops | Flow Meters |
|
Use Scenario: Providing isolated 5V bias for precision DACs and op-amps in smart transmitter designs. IC Role / Device Role / Timing Role: High-efficiency, low-noise buck converter feeding analog signal chain with <10mVP-P ripple. Use Value: Minimizes current-loop error contribution and supports 16-bit+ resolution without additional filtering. |
Use Scenario: Powering ultrasonic transducer drivers and ADCs in industrial flow measurement devices. IC Role / Device Role / Timing Role: Compact 5V/120mA supply with soft-start and tracking for synchronized multi-rail startup. Use Value: Prevents inrush-induced sensor offset drift and ensures clean power during rapid flow transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8604EDDBM#TRPBF | DFN-10 package, no internal BST/INTVCC caps, no SYNC/MODE or HYST pins - only Burst Mode operation. | Lacks programmable modes and compactness; suited for cost-sensitive, fixed-function designs. | Choose when design requires lowest BOM count without mode flexibility or space constraints. |
| LT8609SIV#TRPBF | Higher 500mA output, same 42V input, 2.5µA IQ, but uses different pinout and lacks HYST/SYNC/MODE functionality. | Supports higher current loads but requires redesign for footprint and control interface. | Choose when scaling output current beyond 120mA is needed without changing core architecture. |
Compared with LT8604EDDBM#TRPBF, the LT8604CAV#TRPBF adds mode selectability and integration; compared with LT8609SIV#TRPBF, it trades current capacity for smaller size and finer control - making it optimal for ultra-compact, multi-mode industrial and automotive subsystems.
Availability
LT8604CAV#TRPBF is available at Aetrix Electronics and suitable for industrial sensors, automotive housekeeping supplies, and 4–20mA current loop transmitters requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT8604CAV#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LT8604/LT8604C product line delivers compact, high-efficiency synchronous buck regulators for space- and power-constrained applications - designed specifically for low-IQ industrial sensing and automotive subsystems where reliability and EMI control are critical.
FAQ
What is the maximum input voltage supported by the LT8604CAV#TRPBF?
The LT8604CAV#TRPBF supports an absolute maximum input voltage of 42V, with guaranteed operation from 3.2V to 42V. This wide range enables direct use with 24V and 36V industrial buses and automotive batteries, including cold-crank conditions down to 3.2V. The device includes internal UVLO and thermal protection to maintain safe operation across this full range.
How does the SYNC/MODE pin on the LT8604CAV#TRPBF affect its operation?
The SYNC/MODE pin on the LT8604CAV#TRPBF selects among four distinct operating modes: grounding enables Burst Mode for ultralow IQ; floating enables Forced Continuous Mode for fast transients; applying >3V enables Spread Spectrum for EMI reduction; and driving with an external clock synchronizes switching to that frequency. This single pin replaces multiple configuration options found in competing regulators.
Can the LT8604CAV#TRPBF be used in automotive applications?
Yes, the LT8604CAV#TRPBF is specified for operation from –40°C to +125°C and is AEC-Q100 Grade 1 qualified. It is explicitly designed for automotive housekeeping supplies - powering MCUs, CAN transceivers, and sensors in body control modules and ADAS subsystems - with robust EMI behavior and reliable startup under cold-crank conditions.
What is the purpose of the HYST pin on the LT8604CAV#TRPBF?
The HYST pin on the LT8604CAV#TRPBF is an open-drain output that pulls low whenever the EN/UV comparator is inactive (i.e., EN/UV < 1V). It allows designers to add external hysteresis to the enable threshold using a simple resistor network - preventing oscillation during slow-rising input voltages and improving system stability in marginal supply conditions.
Does the LT8604CAV#TRPBF require external compensation components?
No, the LT8604CAV#TRPBF features internal compensation, eliminating the need for external Type II or Type III compensation networks. This reduces BOM count and layout complexity while ensuring stable operation across all supported output voltages and load conditions - verified across the full –40°C to +125°C temperature range.
LT8604CAV#TRPBF 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#TRPBF FAQ
1.How can I place an order for LT8604CAV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8604CAV#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 LT8604CAV#TRPBF reliable?
The price and inventory of LT8604CAV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8604CAV#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8604CAV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8604CAV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8604CAV#TRPBF?
LT8604CAV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8604CAV#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 LT8604CAV#TRPBF?
For technical support, including LT8604CAV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8604CAV#TRPBF requirements.
6.How does Aetrix verify that LT8604CAV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8604CAV#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 LT8604CAV#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8604CAV#TRPBF?
All LT8604CAV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8604CAV#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 LT8604CAV#TRPBF part is unused and in its original packaging.
Return procedure for LT8604CAV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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