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Analog Devices Inc. LTC3307AACBZ-R7
- Part No.:
- LTC3307AACBZ-R7
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-UFBGA, WLCSP
- Datasheet:
-
LTC3307AACBZ-R7.pdf
- Description:
- IC REG BUCK ADJ 3A 16WLCSP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3307AACBZ-R7 from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 3A output current, operating from 2.25V to 5.5V input, regulating down to 0.5V with ±1% feedback accuracy, and featuring Silent Switcher® architecture for ultralow EMI in a 1.64mm × 1.64mm WLCSP package - ideal for space-constrained FPGA core supplies and battery-powered systems.
For engineers reviewing the LTC3307AACBZ-R7 datasheet, LTC3307AACBZ-R7 pinout, LTC3307AACBZ-R7 application, or LTC3307AACBZ-R7 equivalent, key selection criteria include its 22ns minimum on-time, programmable 1MHz–3MHz switching frequency, Burst Mode® operation with 40µA quiescent current, and thermal performance in the –40°C to +125°C junction range.
Technical Context
The LTC3307AACBZ-R7 uses peak current mode control with internal compensation and fixed-frequency operation, supporting forced continuous, pulse-skipping, or low-ripple Burst Mode® based on MODE/SYNC pin state. Its dual NMOS/PMOS power switches feature 8mΩ top-side and 31mΩ bottom-side RDS(ON), enabling high efficiency across load ranges.
It integrates output overvoltage protection (107–114% VOUT threshold), short-circuit protection, thermal shutdown at ~165°C, and a precision 400mV enable threshold with 50mV hysteresis. The device supports clock synchronization via MODE/SYNC and frequency programming via RT resistor, with 100% duty cycle capability for low-dropout operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - supports single-cell Li-ion, USB, and intermediate bus rails without external LDO pre-regulation. |
| VOUT Range | 0.5V to VIN - enables direct regulation for sub-1V FPGA/ASIC cores and I/O supplies. |
| Output Accuracy | ±1% over temperature - ensures stable voltage margining for sensitive digital loads. |
| Switching Frequency | 1MHz to 3MHz (programmable) - allows optimization of inductor size vs. efficiency and EMI filtering requirements. |
| Min On-Time | 22ns - enables high step-down ratios (e.g., 5V→0.6V at 2MHz) without pulse skipping instability. |
| IQ (Burst Mode) | 40µA - extends battery runtime in always-on, low-duty-cycle sensor nodes and IoT endpoints. |
| Thermal Range | –40°C to +125°C junction - qualified for industrial and automotive under-hood applications. |
Pinout & Package
Package: 16-pin Wafer-Level Chip Scale Package (WLCSP), 1.64mm × 1.64mm × 0.5mm, with solder bumps on bottom side. Exposed die pad is not electrically connected; thermal path relies on bump-to-PCB interface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (A2) | Analog ground reference | Remote sense return for FB; must connect directly to output capacitor negative terminal at load to reject PCB IR drop. |
| EN (B2) | Enable control input | 400mV precision threshold with 50mV hysteresis; supports power sequencing via resistor divider from upstream rail. |
| VIN (B1, B4) | Main power input | Dual pins reduce trace inductance and IR drop; requires local 1µF 0201 ceramic bypass to AGND. |
| PGND (C1, C4, D1, D4) | Power ground return | Return path for bottom switch; must connect to solid ground plane with multiple vias for low-impedance thermal dissipation. |
| SW (C2, C3, D2, D3) | Switch node | High dv/dt node connecting to inductor; requires short, wide copper pour to minimize EMI and ringing. |
| MODE/SYNC (B3) | Mode selection / sync input | Ground = pulse-skipping; float = forced continuous; VIN = Burst Mode®; external clock = synchronized forced continuous. |
| RT (A4) | Frequency set resistor | Resistor to AGND sets fSW from 1–3MHz; open = default 2MHz; driven by external clock = ignored. |
| PGOOD (A3) | Open-drain power-good flag | Active-low signal with 97–99% rising threshold and 120µs delay; used for system power sequencing and fault detection. |
| FB (A1) | Feedback input | Regulates to 0.5V; connects to resistor divider from VOUT to AGND; phase-lead cap optional for transient improvement. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >20dB vs. conventional buck converters - eliminates need for metal shielding in compact layouts. |
| Burst Mode® operation | 40µA IQ at light load with low output ripple - maintains high efficiency across 1000:1 load range without audible noise. |
| 100% duty cycle capability | Enables dropout operation down to VOUT + ILOAD × RDS(ON) - critical for battery end-of-discharge support. |
| Inductor saturation tolerance | Safe operation even if inductor saturates during overload - prevents catastrophic failure and enables robust POL design. |
| Internal compensation | Eliminates external compensation components - reduces BOM count and layout sensitivity while maintaining stability. |
Applications
| FPGA Core Supply | Automotive ADAS Camera Module |
|---|---|
|
Use Scenario: Powering 0.75V/2A core rail of Xilinx Artix-7 FPGA in compact edge AI gateway. IC Role / Device Role / Timing Role: Primary point-of-load regulator with fast transient response to handle logic switching currents. Use Value: 22ns min on-time enables stable 5V→0.75V conversion at 2MHz; Silent Switcher® meets CISPR-25 Class 5 EMI limits without shielding. |
Use Scenario: Providing 1.2V/1.8A supply to Sony IMX490 image sensor and companion ISP in rear-view camera. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC/DC converter operating from 5V automotive bus with cold-crank immunity. Use Value: –40°C to +125°C rating ensures reliability; Burst Mode® extends battery life during parking mode; PGOOD enables safe sensor reset sequencing. |
| Industrial IoT Sensor Node | Optical Transceiver Module (SFP+) |
|
Use Scenario: Regulating 3.3V→1.8V for ultra-low-power ARM Cortex-M33 MCU and LoRaWAN transceiver in battery-operated field sensor. IC Role / Device Role / Timing Role: Always-on power management IC with deep-sleep current optimization. Use Value: 40µA IQ in Burst Mode® extends 2×AA battery life to >5 years; tiny WLCSP footprint saves PCB area in sealed enclosure. |
Use Scenario: Generating 1.2V/3A for SFP+ host controller and laser driver ASIC in 10Gbps optical line card. IC Role / Device Role / Timing Role: High-current, low-noise POL regulator meeting IEEE 802.3ae jitter and ripple specifications. Use Value: Forced continuous mode delivers <10mVPP output ripple at full load; 2mm² footprint fits dense pluggable module layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS6286418RTER | 3A, 2.7–6V input, 1.8V fixed output; 1.8MHz fSW; 1.2mm × 1.6mm DSBGA; no SYNC/MODE pin; only fixed-output variants. | Fixed 1.8V output only; lacks programmable VOUT, frequency, or mode selection - unsuitable for multi-rail or adaptive designs. | Select when board space is tighter than 1.64mm² and output voltage is fixed; avoid when adjustable VOUT or Burst Mode® is required. |
| MP2152GQVE-12-P | 3A, 2.5–5.5V input, 1.2V fixed output; 2MHz fSW; 2mm × 2mm QFN-12; no PGOOD, no RT pin, no Burst Mode® - only forced continuous/pulse-skipping. | No power-good flag or soft-start control; higher IQ (65µA) in light-load mode; no overvoltage protection. | Choose for cost-sensitive industrial controls where PGOOD and OVP are not safety-critical; not recommended for automotive or high-reliability systems. |
Compared with TPS6286418RTER and MP2152GQVE-12-P, the LTC3307AACBZ-R7 provides full configurability (VOUT, fSW, operating mode), integrated protection features (OVP, PGOOD, thermal shutdown), and superior EMI performance - making it the preferred choice for demanding, multi-rail, or safety-aware designs despite its slightly larger footprint.
Availability
LTC3307AACBZ-R7 is available at Aetrix Electronics and suitable for FPGA core supplies, automotive ADAS modules, and industrial IoT sensor nodes requiring stable component supply, long-term lifecycle assurance, and guaranteed WLCSP package availability.
Supply support for LTC3307AACBZ-R7 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 LTC3307A product line delivers ultra-compact, high-efficiency, low-EMI synchronous buck regulators for space- and noise-constrained point-of-load applications - designed specifically for next-generation portable, automotive, and infrastructure electronics.
FAQ
What is the maximum output current capability of the LTC3307AACBZ-R7?
The LTC3307AACBZ-R7 delivers up to 3A continuous output current under typical thermal conditions (TJ ≤ 125°C) with adequate PCB copper area and airflow. Peak current limit is 4.5A to 5.1A depending on VOUT/VIN ratio, and bottom switch valley current limit is 3.9A - verified per datasheet Electrical Characteristics table.
Does the LTC3307AACBZ-R7 support output voltage adjustment?
Yes, the LTC3307AACBZ-R7 supports fully adjustable output voltage from 0.5V to VIN using an external resistor divider connected between VOUT, FB, and AGND. The FB pin regulates to a precise 0.5V reference, enabling accurate scaling - for example, 1.2V output requires R1 = 147kΩ and R2 = 100kΩ.
How does the MODE/SYNC pin configure operating modes on the LTC3307AACBZ-R7?
The MODE/SYNC pin selects three distinct modes: grounded → pulse-skipping; floating → forced continuous; tied to VIN → Burst Mode®. When driven by an external 1–3MHz square wave, it synchronizes switching while enforcing forced continuous mode - slope compensation automatically adapts to the external clock frequency.
What thermal performance can be expected from the LTC3307AACBZ-R7 in its WLCSP package?
The LTC3307AACBZ-R7 WLCSP has θJA = 58°C/W and θJB = 14.8°C/W per JESD51-7 on JEDEC 2S2P board. With proper PCB layout (solid ground plane, ≥6 thermal vias under die), it sustains 3A at ambient temperatures up to +85°C without derating - junction temperature remains below 125°C under typical 5V→1.2V/3A operation.
Is the LTC3307AACBZ-R7 pin-compatible with other members of the LTC3307 family?
No - the LTC3307AACBZ-R7 uses a 16-pin WLCSP package, while LTC3307A variants in LQFN use a 12-pin 2mm × 2mm footprint. Pin functions differ in count and placement; direct PCB replacement is not possible. However, functional compatibility exists with LTC3308 (4A) and LTC3309 (6A) in LQFN packages for system-level design reuse.
LTC3307AACBZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-UFBGA, WLCSP
- 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:
- 3A
- Frequency - Switching:
- 1MHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WLCSP (1.64x1.64)
LTC3307AACBZ-R7 FAQ
1.How can I place an order for LTC3307AACBZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3307AACBZ-R7 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 LTC3307AACBZ-R7 reliable?
The price and inventory of LTC3307AACBZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3307AACBZ-R7 is usually 5 days.
3.What payment methods are accepted for LTC3307AACBZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3307AACBZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3307AACBZ-R7?
LTC3307AACBZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3307AACBZ-R7 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 LTC3307AACBZ-R7?
For technical support, including LTC3307AACBZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3307AACBZ-R7 requirements.
6.How does Aetrix verify that LTC3307AACBZ-R7 is sourced from the original manufacturer or authorized distributors?
All LTC3307AACBZ-R7 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 LTC3307AACBZ-R7 meets industry standards.
7.What is the process for return or replacement of LTC3307AACBZ-R7?
All LTC3307AACBZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with LTC3307AACBZ-R7, 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 LTC3307AACBZ-R7 part is unused and in its original packaging.
Return procedure for LTC3307AACBZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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