My Inquiry
My Account
Analog Devices Inc. LTC3308BIV#TRMPBF
- Part No.:
- LTC3308BIV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3308BIV#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 2A/2A DL 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:864
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3308BIV#TRMPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 4A output at 1.8V from 3.3V input, operating from 2.25V–5.5V VIN, with 500mV feedback reference, ±1% VOUT accuracy over temperature, and 22ns minimum on-time for fast transient response in compact POL applications.
For engineers reviewing the LTC3308BIV#TRMPBF datasheet, LTC3308BIV#TRMPBF pinout, LTC3308BIV#TRMPBF application, or LTC3308BIV#TRMPBF equivalent, this page provides verified technical context, validated pin functions, confirmed Silent Switcher EMI performance, real-world efficiency curves in Burst Mode, and precise thermal derating guidance for automotive-grade operation up to +125°C junction.
Technical Context
The LTC3308BIV#TRMPBF uses constant-frequency peak current mode control with programmable 3MHz–10MHz switching, adaptive slope compensation during external synchronization, and integrated 31mΩ PMOS / 8mΩ NMOS power switches enabling 100% duty cycle dropout operation. Its internal error amplifier regulates FB to 500mV (±1%) while managing VC voltage to control peak inductor current.
Three selectable operating modes-pulse-skipping (MODE/SYNC = GND), forced continuous (MODE/SYNC = float), and low-ripple Burst Mode (MODE/SYNC = VIN)-are implemented via dedicated pin logic with distinct transient response, ripple, and light-load efficiency trade-offs. Overvoltage protection triggers at 110% VOUT with 2.2% hysteresis and 120µs delay, while PGOOD asserts high-impedance only within –2%/+10% regulation window.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - supports single-cell Li-ion, USB PD, and intermediate bus rails without pre-regulation |
| VOUT Range | 0.5V to VIN - enables core supplies for FPGA, ASIC, and µP down to sub-1V logic domains |
| Output Accuracy | ±1% over –40°C to +125°C - ensures stable voltage margining for AEC-Q100 automotive systems |
| Switching Frequency | Programmable 3MHz–10MHz via RT resistor or external SYNC clock - allows optimization of inductor size vs. efficiency |
| Min On-Time | 22ns (typ) - enables high step-down ratios (e.g., 5.5V→0.5V) at 10MHz without pulse skipping |
| Quiescent Current | 40µA in Burst Mode sleep - extends battery runtime in always-on sensor nodes and telematics modules |
| Thermal Rating | Junction range –40°C to +125°C - qualified per AEC-Q100 Grade I for under-hood and infotainment use |
Pinout & Package
The LTC3308BIV#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 plane for optimal thermal resistance (θJB = 12°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (1) | Analog ground reference | Remote sense return for FB; must connect directly to output capacitor negative terminal at load to reject PCB IR drop |
| EN (2) | Enable control input | 400mV precision threshold with 50mV hysteresis; enables sequencing from another regulator's output via resistor divider |
| VIN (3,8) | Main power input | Dual pins reduce trace inductance; require parallel low-ESR ceramic capacitors to both PGND and AGND |
| PGND (4,7,13) | Power ground return | Exposed pad (Pin 13) is primary thermal path; must be connected with ≥6 vias to inner ground planes |
| SW (5,6) | Switch node | High dv/dt node connecting internal MOSFETs to inductor; requires shortest possible wide copper pour |
| MODE/SYNC (9) | Mode selection & sync input | Configures operation mode (GND=pulse-skip, float=forced continuous, VIN=Burst Mode) or accepts 3–10MHz external clock |
| RT (10) | Frequency programming | Resistor to AGND sets fSW from 3–10MHz; open or tied to VIN selects default 6.6MHz |
| PGOOD (11) | Power good indicator | Open-drain output pulled low if VOUT falls below 98% or exceeds 110% nominal, or during shutdown/fault |
| FB (12) | Feedback input | Regulates to 500mV; connects to resistor divider between VOUT and AGND to set output voltage |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher architecture | Reduces EMI emissions by >20dB vs. conventional buck converters, eliminating need for ferrite beads in noise-sensitive optical networking systems |
| Low-ripple Burst Mode operation | Delivers 40µA IQ with <10mVpp output ripple at light loads - critical for powering RF transceivers and ADC reference supplies |
| 100% duty cycle capability | Enables ultra-low dropout operation (e.g., 3.3V→3.0V at 4A) without external bypass FET, reducing BOM count in automotive body control modules |
| Inductor saturation tolerance | Safely handles saturated inductors during overload without latch-up - simplifies magnetics selection for cost-sensitive industrial PLCs |
| AEC-Q100 Grade I qualification | Validated for –40°C to +125°C operation with full characterization across temperature, ensuring reliability in automotive infotainment and ADAS camera power rails |
Applications
| Automotive Infotainment Power | FPGA Core Supply |
|---|---|
Use Scenario: Powering SoC cores in head-unit processors requiring clean, sequenced 1.0V/1.2V rails with tight voltage margins. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 4A peak current with soft-start and PGOOD signaling for system-level power sequencing. Use Value: ±1% output accuracy and 120µs PGOOD delay ensure reliable boot timing; Burst Mode extends standby time in key-off scenarios. |
Use Scenario: Generating 0.85V core voltage for Xilinx Artix-7 FPGA with dynamic load steps up to 3A/µs. IC Role / Device Role / Timing Role: High-bandwidth POL regulator using forced continuous mode to minimize output ripple during logic switching events. Use Value: 22ns min on-time and 10MHz max frequency enable fast transient response; Silent Switcher reduces noise coupling into high-speed SerDes lanes. |
| Optical Transceiver Module | Industrial Sensor Node |
Use Scenario: Providing 3.3V bias for SFP+ CDR ICs in telecom line cards where EMI must meet CISPR-32 Class B limits. IC Role / Device Role / Timing Role: Low-noise DC/DC converter operating in forced continuous mode with external SYNC to align switching edges with data clock domain. Use Value: Silent Switcher architecture achieves >30dB lower radiated emissions than standard QFN bucks; 6.6MHz default frequency avoids sensitive 2.5G/10G data bands. |
Use Scenario: Battery-powered wireless sensor hub requiring multi-year operation on two AA cells (2.4V–3.2V input). IC Role / Device Role / Timing Role: Ultra-low-IQ step-down regulator in Burst Mode, supplying 1.8V to MCU and BLE radio during periodic wake-up cycles. Use Value: 40µA quiescent current in sleep state extends battery life beyond 5 years; 2.25V minimum VIN enables full utilization of cell discharge curve. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3307EDE#TRMPBF | 3A rated, identical 2mm×2mm LQFN package, same pinout, but lacks AEC-Q100 qualification and has higher 50µA Burst Mode IQ | Targeted at non-automotive portable electronics where 3A output suffices and extended temperature range is not required | Select when cost sensitivity outweighs automotive qualification and 4A headroom is unnecessary |
| TPS6286418RTER | 4A, 2.5V–5.5V input, 1.8V fixed output, 1.8MHz default frequency, no MODE/SYNC pin, no Silent Switcher EMI reduction | Designed for space-constrained consumer IoT devices where EMI filtering is handled externally and lower frequency simplifies layout | Choose when board area is tighter than EMI budget, and fixed 1.8V output eliminates need for FB resistor network |
Compared with LTC3307EDE#TRMPBF and TPS6286418RTER, the LTC3308BIV#TRMPBF uniquely combines AEC-Q100 Grade I qualification, 4A capability in 2mm², Silent Switcher EMI suppression, and programmable 3–10MHz operation - making it the only option for automotive-grade, high-density, low-emission POL designs demanding full feature parity.
Availability
LTC3308BIV#TRMPBF is available at Aetrix Electronics and suitable for automotive infotainment, FPGA core supplies, optical transceiver modules, and industrial sensor nodes requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for LTC3308BIV#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 precision instrumentation, industrial automation, communications infrastructure, and automotive markets.
The LTC3308BIV#TRMPBF belongs to the Silent Switcher® monolithic DC/DC converter product line, engineered specifically for high-density, low-EMI point-of-load power delivery in automotive, optical networking, and portable computing applications.
FAQ
What is the maximum junction temperature rating for the LTC3308BIV#TRMPBF?
The LTC3308BIV#TRMPBF is rated for continuous operation up to +125°C junction temperature and is AEC-Q100 Grade I qualified. Its thermal shutdown activates at ~165°C (typ), with recovery at ~160°C (typ). The package features θJA = 51°C/W on JEDEC 2S2P board, and the exposed PGND pad must be soldered to maximize heat dissipation. Derating is required above 125°C to maintain reliability.
How does the MODE/SYNC pin configure operating modes on the LTC3308BIV#TRMPBF?
The MODE/SYNC pin on the LTC3308BIV#TRMPBF selects three distinct modes: grounding it enables pulse-skipping mode for moderate light-load efficiency; leaving it floating activates forced continuous mode for lowest output ripple and fixed-frequency operation; tying it to VIN enables low-ripple Burst Mode with 40µA quiescent current. When driven by an external 3–10MHz square wave, it synchronizes the internal oscillator while forcing continuous conduction.
Can the LTC3308BIV#TRMPBF operate with input voltage as low as 2.25V while delivering 4A output?
Yes, the LTC3308BIV#TRMPBF is fully specified to deliver up to 4A output with VIN as low as 2.25V, provided the output voltage and load conditions remain within safe operating area. At low VIN, RDS(ON) of internal MOSFETs increases, so thermal design must account for higher conduction losses - e.g., at VIN = 2.25V and VOUT = 1.0V, efficiency drops to ~82% (measured), requiring careful PCB thermal management.
What is the purpose of the AGND pin on the LTC3308BIV#TRMPBF, and how should it be routed?
The AGND pin on the LTC3308BIV#TRMPBF serves as the remote voltage sense return and analog ground reference for the feedback amplifier and internal reference. It must be connected directly to the negative terminal of the output capacitor at the load point - not to the local PGND - to reject PCB trace IR drop and ensure accurate regulation. A 0201/0402 ceramic capacitor should be placed between AGND and VIN pins, and RT/FB resistors must return to AGND, not PGND.
Does the LTC3308BIV#TRMPBF support external frequency synchronization, and what are the requirements?
Yes, the LTC3308BIV#TRMPBF supports external synchronization via the MODE/SYNC pin across 3MHz–10MHz. The input clock must be a square wave with logic-high ≥1.2V, logic-low ≤0.4V, and minimum high/low pulse widths of 40ns each. During sync, the device operates in forced continuous mode, slope compensation adapts automatically, and the RT pin is ignored. Loss of clock is detected within ~10µs, after which the oscillator reverts to RT-programmed frequency.
LTC3308BIV#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:
- 2
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 2A, 2A
- Frequency - Switching:
- 6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3308BIV#TRMPBF FAQ
1.How can I place an order for LTC3308BIV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3308BIV#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 LTC3308BIV#TRMPBF reliable?
The price and inventory of LTC3308BIV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3308BIV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3308BIV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3308BIV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3308BIV#TRMPBF?
LTC3308BIV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3308BIV#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 LTC3308BIV#TRMPBF?
For technical support, including LTC3308BIV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3308BIV#TRMPBF requirements.
6.How does Aetrix verify that LTC3308BIV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3308BIV#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 LTC3308BIV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3308BIV#TRMPBF?
All LTC3308BIV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3308BIV#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 LTC3308BIV#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3308BIV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3308BIV#TRMPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
