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Analog Devices Inc. LTC3308AHV#TRMPBF
- Part No.:
- LTC3308AHV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3308AHV#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 4A 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:505
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Product details
Overview
LTC3308AHV#TRMPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 4A output current, operating from 2.25V to 5.5V input, regulating down to 0.5V with ±1% VFB accuracy, and featuring Silent Switcher® architecture for ultralow EMI in automotive power supplies.
For engineers reviewing the LTC3308AHV#TRMPBF datasheet, LTC3308AHV#TRMPBF pinout, LTC3308AHV#TRMPBF application, or LTC3308AHV#TRMPBF equivalent, this page provides verified thermal specs (–40°C to +150°C junction), 22ns minimum on-time, 1MHz–3MHz programmable switching frequency, and Burst Mode® operation with 40µA quiescent current - all critical for battery-powered and high-reliability embedded systems.
Technical Context
The LTC3308AHV#TRMPBF uses constant-frequency peak current mode control with internal compensation, enabling fast transient response and stable regulation across wide VIN/VOUT ratios. Its dual MOSFET power stage integrates an 8mΩ NMOS and 31mΩ PMOS switch, supporting up to 100% duty cycle for low-dropout operation.
Mode selection is controlled via the MODE/SYNC pin: forced continuous (floating), pulse skip (grounded), or Burst Mode® (tied to VIN). Synchronization to external 1MHz–3MHz clocks is supported, with automatic slope compensation adaptation and PLL-based lock-in within ~10µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - supports single-cell Li-ion, USB PD, and 3.3V/5V rail inputs without pre-regulation. |
| VOUT Range | 0.5V to VIN - enables direct core supply for FPGAs, ASICs, and µPs requiring sub-1V rails. |
| Output Accuracy | ±1% over temperature - ensures stable voltage regulation under thermal stress in automotive cabins. |
| Switching Frequency | 1MHz to 3MHz (RT-programmable or SYNC-synchronized) - allows compact magnetics and noise avoidance in sensitive RF bands. |
| Min On-Time | 22ns - enables high step-down ratios (e.g., 5V→0.6V at 2MHz) without pulse skipping artifacts. |
| Quiescent Current | 40µA in Burst Mode® sleep - extends battery life in always-on telematics and ADAS sensors. |
| Junction Temp Range | –40°C to +150°C - qualified per AEC-Q100 Grade H for under-hood automotive applications. |
| Thermal Resistance | θJA = 51°C/W - achieved via 2mm × 2mm LQFN with exposed PGND pad soldered to PCB ground plane. |
Pinout & Package
The LTC3308AHV#TRMPBF is housed in a thermally enhanced 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed PGND pad (Pin 13), requiring solder connection to PCB ground for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (1) | Analog ground reference | Remote output voltage sense return; must connect directly to output capacitor negative terminal at load for accurate regulation. |
| EN (2) | Enable control input | 400mV precision threshold with hysteresis; enables power-up sequencing when driven by upstream regulator feedback divider. |
| VIN (3, 8) | Main input power supply | Dual pins reduce IR drop and parasitic inductance; require parallel short-wide traces and local ceramic bypass to AGND/PGND. |
| PGND (4, 7, 13) | Power ground return path | Primary return for bottom switch and thermal conduction path; exposed pad (Pin 13) must be vias-connected to large internal/external ground planes. |
| SW (5, 6) | Switch node output | High dv/dt node connecting internal MOSFETs to inductor; requires minimal trace area and tight coupling to reduce EMI radiation. |
| MODE/SYNC (9) | Operating mode & clock sync | Configures Burst Mode® (VIN), pulse skip (GND), forced continuous (float), or external clock sync (1–3MHz square wave). |
| RT (10) | Frequency programming | Resistor-to-AGND sets switching frequency; open or tied to VIN selects default ~2MHz oscillator. |
| PGOOD (11) | Power good indicator | Open-drain output pulled low if VOUT falls below 97% or rises above 110% of setpoint, with 120µs delay and hysteresis filtering. |
| FB (12) | Feedback voltage input | Regulates to 500mV reference; connects to resistor divider between VOUT and AGND to program output voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs conventional buck converters, eliminating need for metal shielding in space-constrained automotive modules. |
| Burst Mode® operation | Delivers 90%+ efficiency at 1mA load with 40µA IQ, enabling multi-year battery life in always-on vehicle event recorders. |
| 100% duty cycle capability | Supports dropout operation down to VOUT = VIN – ILOAD × RDS(ON)_PMOS, critical for cold-crank scenarios where VIN dips to 2.25V. |
| AEC-Q100 Grade H qualification | Validated for –40°C to +150°C operation with full electrical testing, meeting automotive reliability requirements for engine control units. |
| Internal compensation | Eliminates external compensation components, reducing BOM count and layout sensitivity while maintaining stability across 0.5V–5.5V output range. |
| Inductor saturation tolerance | Safely handles inductor saturation during overload without latch-up, enabling robust design against transient short circuits in infotainment power rails. |
Applications
| Automotive ADAS Camera Power | FPGA Core Supply |
|---|---|
|
Use Scenario: Powering image sensor and ISP in rear-view camera module exposed to under-hood temperatures up to 125°C ambient. IC Role / Device Role / Timing Role: Primary 1.2V/4A POL regulator converting 5V domain to FPGA core voltage with tight ripple and fast load transient response. Use Value: 22ns min on-time enables stable 1.2V output at 2MHz switching, minimizing inductor size while meeting CISPR-25 Class 5 EMI limits via Silent Switcher®. |
Use Scenario: Supplying configurable logic core of Xilinx Zynq UltraScale+ MPSoC in autonomous driving compute unit. IC Role / Device Role / Timing Role: High-accuracy, low-noise step-down converter delivering 0.85V ±1% with soft-start sequencing aligned to system reset signals. Use Value: ±1% VFB accuracy and internal compensation ensure reliable startup across temperature, while Burst Mode® extends runtime during low-power perception cycles. |
| Telematics Control Unit (TCU) | Industrial IoT Edge Node |
|
Use Scenario: Power management for LTE modem, GNSS receiver, and CAN transceiver in vehicle connectivity gateway operating continuously for 10+ years. IC Role / Device Role / Timing Role: Main 3.3V/4A supply derived from 12V battery via intermediate 5V rail, with PGOOD monitoring and thermal shutdown protection. Use Value: 40µA Burst Mode® IQ and –40°C to +150°C rating enable reliable operation in parked vehicle battery-saving mode without thermal derating. |
Use Scenario: Compact 24V-to-3.3V conversion in DIN-rail mounted condition monitoring sensor with wireless BLE transmission. IC Role / Device Role / Timing Role: Secondary buck regulator after front-end 24V-to-5V stage, providing clean, low-EMI 3.3V for microcontroller and radio subsystem. Use Value: 2mm × 2mm footprint and integrated MOSFETs eliminate discrete power stage layout complexity, accelerating time-to-certification for industrial EMC standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3307EV#TRMPBF | 3A rated, same 2mm × 2mm LQFN package, identical pinout, but lower current capability and no AEC-Q100 qualification. | Suitable for non-automotive 3A loads like portable test equipment; lacks 150°C thermal rating and automotive reliability reporting. | Select when 3A output suffices and automotive qualification is unnecessary - reduces cost without layout change. |
| LTC3309HV#TRMPBF | 6A rated, same package footprint and pinout, shares Silent Switcher® architecture and Burst Mode®, but higher RDS(ON) at light loads. | Required for higher-current FPGA or SoC applications; delivers 2A more output but consumes ~15% more quiescent current in Burst Mode®. | Choose when future-proofing for 5–6A peak loads is needed - maintains PCB compatibility while upgrading headroom. |
Compared with LTC3307EV#TRMPBF and LTC3309HV#TRMPBF, the LTC3308AHV#TRMPBF uniquely balances 4A output, AEC-Q100 Grade H qualification, and 40µA Burst Mode® IQ - making it the optimal choice for automotive telematics and ADAS power rails where thermal margin, reliability, and efficiency coexist.
Availability
LTC3308AHV#TRMPBF is available at Aetrix Electronics and suitable for automotive ADAS camera modules, FPGA core supplies, and industrial IoT edge nodes requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for LTC3308AHV#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 automotive, industrial, communications, and healthcare markets with precision power, sensing, and signal chain solutions.
The LTC3308A family is designed specifically for space-constrained, high-reliability automotive and industrial point-of-load applications demanding ultralow EMI, wide temperature operation, and seamless integration with minimal external components.
FAQ
What is the maximum junction temperature rating for LTC3308AHV#TRMPBF?
The LTC3308AHV#TRMPBF is rated for operation up to +150°C junction temperature and is AEC-Q100 Grade H qualified. This specification is validated across the full –40°C to +150°C operating junction temperature range, with thermal shutdown engaging at ~165°C to protect the device during overload conditions. The LTC3308AHV#TRMPBF's θJA of 51°C/W enables reliable operation in under-hood environments when properly mounted on a thermally optimized PCB.
Does LTC3308AHV#TRMPBF support external clock synchronization?
Yes, the LTC3308AHV#TRMPBF supports external clock synchronization via its MODE/SYNC pin, accepting 1MHz–3MHz square wave inputs. When synchronized, the device operates in forced continuous mode with automatic slope compensation adaptation, and the RT pin is ignored. The internal PLL achieves lock within ~10µs of the first rising edge, and detects clock removal within the same timeframe to revert to RT-programmed frequency.
How does the Burst Mode® operation of LTC3308AHV#TRMPBF improve battery life?
LTC3308AHV#TRMPBF achieves 40µA quiescent current in Burst Mode® sleep state, enabling multi-year operation in battery-backed automotive event recorders and telematics modules. During light loads, the regulator charges the output capacitor above regulation, then powers down most circuitry until VOUT drops below threshold - eliminating switching losses while maintaining tight output voltage regulation through burst cycling.
Can LTC3308AHV#TRMPBF operate with a 2.25V input supply?
Yes, LTC3308AHV#TRMPBF is fully specified to operate from 2.25V to 5.5V input. At 2.25V, it supports output voltages down to 0.5V using its 22ns minimum on-time and 100% duty cycle capability. However, RDS(ON) of the internal PMOS increases at low VIN, so thermal design must account for higher conduction losses - especially critical in cold-crank automotive scenarios.
What is the purpose of the AGND pin on LTC3308AHV#TRMPBF?
The AGND pin on LTC3308AHV#TRMPBF serves as the remote output voltage sense return and analog ground reference for internal error amplifiers and comparators. It must be connected directly to the negative terminal of the output capacitor at the load point - not to the PGND plane - to reject PCB trace resistance and ensure ±1% output accuracy across load and temperature. AGND also provides the return path for FB and RT resistors.
LTC3308AHV#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®1
- 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):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 4A
- Frequency - Switching:
- 1MHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3308AHV#TRMPBF FAQ
1.How can I place an order for LTC3308AHV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3308AHV#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 LTC3308AHV#TRMPBF reliable?
The price and inventory of LTC3308AHV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3308AHV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3308AHV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3308AHV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3308AHV#TRMPBF?
LTC3308AHV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3308AHV#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 LTC3308AHV#TRMPBF?
For technical support, including LTC3308AHV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3308AHV#TRMPBF requirements.
6.How does Aetrix verify that LTC3308AHV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3308AHV#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 LTC3308AHV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3308AHV#TRMPBF?
All LTC3308AHV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3308AHV#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 LTC3308AHV#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3308AHV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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