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Analog Devices Inc. LTC3308AMPV#TRMPBF
- Part No.:
- LTC3308AMPV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3308AMPV#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 4A 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:300
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Product details
Overview
LTC3308AMPV#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-grade 2mm × 2mm LQFN-12 package with exposed PGND pad.
For engineers reviewing the LTC3308AMPV#TRMPBF datasheet, LTC3308AMPV#TRMPBF pinout, LTC3308AMPV#TRMPBF application, or LTC3308AMPV#TRMPBF equivalent, this page delivers verified thermal specs (–55°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 power design.
Technical Context
The LTC3308AMPV#TRMPBF uses constant-frequency peak current mode control with internal compensation, enabling fast transient response and stable regulation without external loop components. Its dual MOSFET power stage integrates an 8mΩ NMOS bottom switch and 31mΩ PMOS top 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 the device includes full protection - overvoltage, short-circuit, thermal shutdown, and reverse current limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - supports single-cell Li-ion, USB PD, and wide-input industrial rails. |
| IOUT Max | 4A continuous - sufficient for FPGA core, ASIC I/O, or microprocessor VDD domains. |
| VOUT Accuracy | ±1% over temperature - ensures stable logic supply under thermal stress without calibration. |
| Switching Frequency | 1MHz to 3MHz (RT-programmable or SYNC) - enables compact 22nH–470nH inductors and <100µF total output capacitance. |
| Min On-Time | 22ns - allows high step-down ratios (e.g., 5V→0.6V at 2MHz) without pulse skipping. |
| IQ (Burst Mode) | 40µA - extends battery runtime in always-on sensor nodes and low-power wake-up circuits. |
| Thermal Range | –55°C to +150°C junction - qualified for extended-temperature automotive and avionics applications. |
Pinout & Package
The LTC3308AMPV#TRMPBF is housed in a thermally enhanced 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed PGND pad (Pin 13), optimized for low θJA = 51°C/W and θJB = 12°C/W on standard JEDEC 2S2P PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (1) | Analog ground reference | Remote sense return for FB and RT; must connect directly to output capacitor negative terminal to minimize load regulation error. |
| EN (2) | Enable control input | 400mV precision threshold with hysteresis; enables sequencing with upstream regulators via resistor divider. |
| VIN (3,8) | Main power input | Dual pins reduce IR drop and parasitic inductance; require parallel low-ESR ceramic bypassing to AGND and PGND. |
| PGND (4,7,13) | Power ground return | Primary thermal and electrical path for bottom switch; exposed pad (13) must be soldered to large PCB ground plane with ≥6 vias. |
| SW (5,6) | Switch node | High-dI/dt connection to inductor; pins must be shorted and routed with minimal loop area to suppress EMI. |
| MODE/SYNC (9) | Mode select & clock sync | Configures Burst/Pulse Skip/Forced Continuous modes; accepts 1MHz–3MHz external clock for deterministic timing. |
| RT (10) | Frequency set resistor | Connects to AGND via resistor (e.g., 34.8kΩ → 2MHz); ignored when external clock applied to MODE/SYNC. |
| PGOOD (11) | Open-drain status flag | Asserts high-Z when VOUT is within –2%/+10% of target; includes 120µs delay and hysteresis to reject noise. |
| FB (12) | Feedback input | Senses 0.5V reference; connects to resistor divider from VOUT to 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 designs. |
| Low-Ripple Burst Mode® | Maintains <10mVPP output ripple at light loads while drawing only 40µA IQ, ideal for noise-sensitive analog/RF subsystems. |
| 22ns Minimum On-Time | Enables direct 5V-to-0.6V conversion at 2MHz, avoiding complex two-stage architectures in portable electronics. |
| 100% Duty Cycle Operation | Supports dropout regulation down to VIN – VDS(ON) × IOUT, extending usable input range in brownout conditions. |
| AEC-Q100 Qualified | Rated for automotive applications per Grade 1 (–40°C to +125°C) and Grade 0 (–55°C to +150°C) - validated for lifetime reliability under thermal cycling and vibration. |
Applications
| Automotive ADAS Camera Module | FPGA Core Power Supply |
|---|---|
Use Scenario: Dual-rail power for image sensor (1.2V) and ISP (0.85V) in rear-view camera under engine compartment thermal stress. IC Role / Device Role / Timing Role: Primary 4A synchronous buck regulator with Burst Mode for standby current reduction and PGOOD for system-level fault reporting. Use Value: –55°C to +150°C rating ensures startup at cold soak and sustained operation at under-hood temperatures; 40µA IQ extends parking-mode battery life. | Use Scenario: Single 1.0V core supply for Xilinx Artix-7 FPGA during configuration and active logic operation. IC Role / Device Role / Timing Role: High-efficiency step-down converter with forced continuous mode for low-noise digital rail and soft-start to prevent configuration failure. Use Value: 22ns min on-time enables 3.3V→1.0V at 2MHz; ±1% VFB accuracy maintains FPGA VCCINT tolerance; PGOOD signals configuration readiness to host processor. |
| Industrial IoT Edge Node | Optical Transceiver Bias Supply |
Use Scenario: Always-on sensor hub with BLE radio, MEMS accelerometer, and flash memory powered from coin cell or energy harvester. IC Role / Device Role / Timing Role: Ultra-low-IQ DC/DC regulator delivering 3.3V at up to 4A peak during radio transmit bursts. Use Value: 40µA Burst Mode IQ maximizes shelf life; 100% duty cycle sustains output during battery voltage sag; PGOOD enables MCU sleep/wake coordination. | Use Scenario: Precision 3.3V bias for SFP+ laser driver IC requiring low-noise, fast transient response during data burst transmission. IC Role / Device Role / Timing Role: Low-EMI, high-bandwidth synchronous buck supplying laser bias with PGOOD monitoring for link integrity. Use Value: Silent Switcher architecture meets Class B CISPR-32 radiated emissions limits; 2MHz switching avoids interference with 10Gbps data lanes; 120µs PGOOD delay rejects false triggers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3307EV#TRMPBF | 3A rated, same package and pinout, but lower current capability and no AEC-Q100 qualification. | Suitable for sub-3A loads where extended temperature range is not required. | Select when cost sensitivity outweighs 4A headroom and automotive qualification. |
| TPS62864DRLR | 4A, 2.5V–5.5V input, 1.8V–3.3V fixed output only; no RT programming or SYNC; 17µA IQ in DCM. | Limited to fixed-output applications; lacks programmable frequency and remote sensing (AGND). | Choose for simple, low-cost point-of-load where adjustable VOUT and EMI performance are secondary. |
Compared with LTC3307EV#TRMPBF and TPS62864DRLR, the LTC3308AMPV#TRMPBF uniquely combines AEC-Q100 Grade 0 qualification, 22ns min on-time for high-ratio conversion, and Silent Switcher EMI suppression - making it the only option for demanding automotive and industrial edge applications requiring both reliability and noise immunity.
Availability
LTC3308AMPV#TRMPBF is available at Aetrix Electronics and suitable for automotive ADAS systems, FPGA core supplies, industrial IoT edge nodes, and optical transceiver bias circuits requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3308AMPV#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 industrial, automotive, communications, and healthcare markets.
The LTC3308A product line delivers ultra-small, high-efficiency, low-EMI synchronous buck regulators for space-constrained, noise-sensitive, and thermally demanding applications - especially where automotive qualification and wide input/output flexibility are mandatory.
FAQ
What is the operating temperature range of the LTC3308AMPV#TRMPBF?
The LTC3308AMPV#TRMPBF is specified for a junction temperature range of –55°C to +150°C, meeting AEC-Q100 Grade 0 requirements. This extended range supports deployment in harsh environments such as engine compartments, avionics bays, and industrial control cabinets where ambient temperatures exceed standard commercial or industrial grades. Derating curves and thermal impedance data (θJA = 51°C/W) are provided in the datasheet to assist in board-level thermal design.
Does the LTC3308AMPV#TRMPBF support output voltages below 1V?
Yes, the LTC3308AMPV#TRMPBF regulates output voltages as low as 0.5V using the FB pin referenced to a precise 0.5V internal bandgap. With appropriate resistor divider selection (e.g., RB = 200kΩ, RA = 100kΩ for 0.75V), the device maintains ±1% accuracy across load, line, and temperature. The 22ns minimum on-time further enables stable low-VOUT operation even at 2MHz switching frequency.
How does the MODE/SYNC pin configure operating modes on the LTC3308AMPV#TRMPBF?
The MODE/SYNC pin on the LTC3308AMPV#TRMPBF selects three distinct modes: grounding enables Pulse Skip mode (low-noise, fixed-frequency), floating enables Forced Continuous mode (lowest ripple, full bandwidth), and tying to VIN enables Burst Mode operation (40µA IQ, optimal for battery life). When driven by an external 1MHz–3MHz square wave, it synchronizes the internal oscillator while enforcing Forced Continuous mode with adaptive slope compensation.
What protection features are integrated into the LTC3308AMPV#TRMPBF?
The LTC3308AMPV#TRMPBF integrates output overvoltage protection (shuts off top switch if FB > 110% VOUT), short-circuit protection (valley current limiting and cycle skipping), thermal shutdown (165°C trip, 160°C release), and input undervoltage lockout (2.1V rising threshold). It also provides reverse current limiting in Forced Continuous mode and robust EN pin hysteresis to prevent erratic enable/disable behavior during power ramp-up.
Can the LTC3308AMPV#TRMPBF be synchronized to an external clock source?
Yes, the LTC3308AMPV#TRMPBF supports synchronization via its MODE/SYNC pin, accepting external clock signals from 1MHz to 3MHz. During synchronization, the internal PLL locks to the rising edge of the input clock, enforces Forced Continuous mode, and automatically adjusts slope compensation to match the external frequency. Clock removal is detected within ~10µs, after which the device seamlessly reverts to RT-pin-programmed frequency.
LTC3308AMPV#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3308AMPV#TRMPBF FAQ
1.How can I place an order for LTC3308AMPV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3308AMPV#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 LTC3308AMPV#TRMPBF reliable?
The price and inventory of LTC3308AMPV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3308AMPV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3308AMPV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3308AMPV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3308AMPV#TRMPBF?
LTC3308AMPV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3308AMPV#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 LTC3308AMPV#TRMPBF?
For technical support, including LTC3308AMPV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3308AMPV#TRMPBF requirements.
6.How does Aetrix verify that LTC3308AMPV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3308AMPV#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 LTC3308AMPV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3308AMPV#TRMPBF?
All LTC3308AMPV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3308AMPV#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 LTC3308AMPV#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3308AMPV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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