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Analog Devices Inc. LTC3315AACBZ-R7
- Part No.:
- LTC3315AACBZ-R7
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-UFBGA, WLCSP
- Datasheet:
-
LTC3315AACBZ-R7.pdf
- Description:
- IC REG BCK ADJ 2A/2A DL 16WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:249
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Product details
Overview
LTC3315AACBZ-R7 from Analog Devices is a dual-channel monolithic synchronous step-down DC/DC converter IC delivering 2A per channel from a 2.25V–5.5V input, with integrated 19mΩ NMOS and 75mΩ PMOS power switches, 2MHz default switching frequency, and 500mV feedback reference for precise 0.5V–VIN output regulation-designed for space-constrained FPGA core supplies and POL applications.
For engineers reviewing the LTC3315AACBZ-R7 datasheet, LTC3315AACBZ-R7 pinout, LTC3315AACBZ-R7 application, or LTC3315AACBZ-R7 equivalent, key selection considerations include its WLCSP-16 package (1.64mm × 1.64mm), dual-phase 180° out-of-phase operation, Burst Mode® efficiency at light loads, ±1% VOUT accuracy, and MODE/SYNC pin programmability across pulse-skipping, forced continuous, and synchronized modes.
Technical Context
The LTC3315AACBZ-R7 integrates two independent peak-current-mode controlled buck regulators sharing a common oscillator and MODE/SYNC interface. Each channel features separate EN, FB, and SW pins, internal soft-start, and 180° phase interleaving to reduce input ripple. The device supports external synchronization from 1MHz to 3MHz via the MODE/SYNC pin, with automatic slope compensation adaptation.
It implements three selectable operating modes: forced continuous (fixed-frequency PWM), pulse-skipping (low-noise), and Burst Mode® (ultra-low IQ = 70µA typical with both bucks enabled). Protection includes overtemperature shutdown (165°C), output overvoltage (107–114% of VOUT), short-circuit, and inductor saturation tolerance-enabled by valley current limiting and reverse-current control.
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. |
| Output Current | 2A per channel - enables compact dual-rail core supplies for FPGAs, ASICs, and microprocessors. |
| Switching Frequency | 2MHz (default), synchronizable 1–3MHz - allows use of sub-1µH inductors and reduces solution footprint. |
| VFB Accuracy | ±1% (495–505mV) - ensures tight output voltage regulation across temperature and load. |
| Min On-Time | 25ns - enables high VIN-to-low VOUT conversion (e.g., 5.5V → 0.5V at 2MHz) without pulse skipping. |
| Shutdown IQ | 1.2µA - minimizes battery drain in always-on systems during deep sleep. |
| Thermal Range | –40°C to +125°C junction - qualified for industrial and automotive under-hood environments. |
Pinout & Package
Package: 16-ball WLCSP (1.64mm × 1.64mm × 0.5mm), MSL1, e1 finish, exposed substrate ground (Balls D2/D3/B4 connected to GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 (B3) | Buck 1 enable input | Active-high with 400mV precision threshold; supports resistor-divider sequencing from upstream rail. |
| FB1 (A3) | Buck 1 feedback node | Regulates VOUT1 to 500mV; connects to mid-point of R-divider for programmable output voltage. |
| FB2 (A2) | Buck 2 feedback node | Independent regulation of VOUT2 to 500mV; enables asymmetric dual-output configurations. |
| EN2 (B2) | Buck 2 enable input | Independent control for power-up sequencing; low leakage (<±20nA) prevents unintended wake-up. |
| PGOOD (A1) | Open-drain status flag | Asserts low if either enabled buck's output falls below 97% or exceeds 114% of target VOUT. |
| SW2 (C1,C2) | Buck 2 switch node | High-current path to external inductor; requires short, wide PCB trace to minimize EMI and losses. |
| VIN (B1,D1,D4) | Input supply pins | Three dedicated VIN balls reduce IR drop; each requires local 10µF ceramic bypass to GND. |
| GND (B4,D2,D3) | Ground terminals | Three GND balls plus substrate connection ensure low-impedance return path and thermal conduction. |
| SW1 (C3,C4) | Buck 1 switch node | Phase-interleaved with SW2; enables 180° out-of-phase operation to halve input RMS current. |
| MODE/SYNC (A4) | Mode control & sync input | Configures operating mode (low = pulse-skip, high = Burst, float = forced continuous); accepts 1–3MHz external clock. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 2A synchronous bucks in one die | Reduces board area vs. discrete solutions; eliminates inter-channel timing skew and simplifies layout. |
| 180° phase interleaving | Cuts input capacitor RMS current by ~30%, enabling smaller, lower-cost bulk capacitance. |
| Burst Mode® operation | Achieves >85% efficiency at 1mA load with <70µA total quiescent current-critical for battery longevity. |
| Internal soft-start & compensation | Eliminates need for external compensation networks; 0.25–3ms programmable soft-start prevents inrush damage. |
| Robust protection suite | Includes overtemperature (165°C), output overvoltage (110% typ), short-circuit, and reverse-current limiting-no external components required. |
Applications
| FPGA Core & I/O Supplies | Automotive ADAS Power Rails |
|---|---|
Use Scenario: Providing tightly regulated 0.8V/1.2V core and 1.8V/2.5V I/O voltages to Xilinx or Intel FPGAs in compact edge AI accelerators. IC Role / Device Role / Timing Role: Dual-channel buck regulator delivering independent, sequenced, low-noise power with PGOOD monitoring for system reset coordination. Use Value: 2A per channel and 25ns min on-time support high-current, low-VOUT FPGA cores; WLCSP package enables placement directly under BGA for minimal loop inductance. | Use Scenario: Generating isolated 1.0V, 1.8V, and 3.3V rails for radar SoCs, camera ISPs, and CAN transceivers in AEC-Q100-compliant modules. IC Role / Device Role / Timing Role: High-reliability dual-buck controller meeting automotive thermal and transient requirements, with PGOOD signaling for ASIL-B diagnostics. Use Value: –40°C to +125°C operation, 165°C overtemperature shutdown, and robust ESD-hardened WLCSP meet automotive environmental stress standards. |
| Industrial IoT Sensor Hubs | Optical Networking POL |
Use Scenario: Powering ultra-low-power MCUs, MEMS sensors, and BLE/Wi-Fi radios in battery-operated condition-monitoring nodes. IC Role / Device Role / Timing Role: Dual-output POL regulator with Burst Mode® and <2µA shutdown current, enabling multi-year battery life. Use Value: 1.2µA shutdown IQ and 70µA light-load IQ extend battery runtime; small WLCSP footprint fits inside sealed enclosures. | Use Scenario: Delivering clean, fast-transient 1.2V and 2.5V supplies to DSPs and transimpedance amplifiers in SFP+ and QSFP modules. IC Role / Device Role / Timing Role: High-bandwidth, low-ripple dual buck with 2MHz fixed frequency and 180° interleaving for low-noise analog front-ends. Use Value: 25ns min on-time and fast transient response (<20µs recovery) maintain signal integrity in high-speed optical links. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62150ARGTR | Single 2A buck, 3–17V input, no dual output or phase interleaving; 1.2MHz max fSW. | Requires two devices for dual-rail designs; larger solution size and higher input ripple. | Select only when single-output capability suffices and input voltage exceeds 5.5V. |
| MP2147GQZ-P | Dual 2A buck, 2.7–6V input, 1.5MHz fSW, QFN-16 package; lacks Burst Mode®, higher light-load IQ (120µA). | Higher thermal resistance (θJA = 60°C/W vs. 58°C/W) and no AEC-Q100 qualification. | Consider for cost-sensitive industrial apps where automotive temp range and ultra-low IQ are not required. |
Compared with TPS62150ARGTR and MP2147GQZ-P, the LTC3315AACBZ-R7 uniquely delivers dual 2A outputs in a 1.64mm² WLCSP with Burst Mode® efficiency, 25ns min on-time, and AEC-Q100 qualification-making it optimal for space- and power-constrained dual-rail systems requiring automotive-grade reliability.
Availability
LTC3315AACBZ-R7 is available at Aetrix Electronics and suitable for FPGA core supplies, automotive ADAS modules, and industrial IoT sensor hubs requiring stable component supply, long-term lifecycle support, and guaranteed WLCSP packaging consistency.
Supply support for LTC3315AACBZ-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 LTC3315A product line delivers highly integrated, thermally optimized dual buck regulators targeting space-constrained point-of-load applications demanding high efficiency, fast transient response, and automotive-grade reliability.
FAQ
What is the package type and dimensions of the LTC3315AACBZ-R7?
The LTC3315AACBZ-R7 uses a 16-ball wafer-level chip-scale package (WLCSP) measuring 1.64mm × 1.64mm × 0.5mm with e1 finish and MSL1 rating. Its three GND balls (B4, D2, D3) and substrate ground connection provide low thermal resistance (θJB = 14.8°C/W) and robust electrical grounding-critical for high-current, high-frequency operation in compact layouts.
Does the LTC3315AACBZ-R7 support external clock synchronization?
Yes, the LTC3315AACBZ-R7 supports external clock synchronization via the MODE/SYNC pin across a 1MHz to 3MHz range. When an external clock is applied, both buck regulators operate in forced continuous mode with Buck 1 aligned to the rising edge and Buck 2 180° out of phase-enabling deterministic EMI reduction and system-level timing coordination without modifying the LTC3315AACBZ-R7's internal design.
What are the key differences between Burst Mode®, pulse-skipping, and forced continuous modes on the LTC3315AACBZ-R7?
Burst Mode® minimizes light-load IQ to ~70µA (both bucks enabled) by cycling between active bursts and deep sleep; pulse-skipping maintains constant frequency but skips cycles to regulate; forced continuous operates at fixed frequency with reverse inductor current allowed. All three are selected via the MODE/SYNC pin voltage on the LTC3315AACBZ-R7-giving designers flexibility to optimize for efficiency, noise, or transient response.
How does the LTC3315AACBZ-R7 handle overvoltage and overtemperature conditions?
The LTC3315AACBZ-R7 provides output overvoltage protection triggering at 107–114% of regulated VOUT (with 1–3.5% hysteresis) and overtemperature shutdown at 165°C (with 5°C hysteresis). Both protections are fully internal-requiring no external components-and assert PGOOD low during fault conditions. These safeguards ensure safe operation in unregulated input environments and thermal overload scenarios without compromising the LTC3315AACBZ-R7's compact footprint.
Can the LTC3315AACBZ-R7 be used for asymmetric output voltages such as 1.2V and 3.3V?
Yes, the LTC3315AACBZ-R7 supports independent output programming via separate FB1 and FB2 pins, each regulated to 500mV. By using different resistor dividers on FB1 and FB2, designers can set distinct output voltages-for example, 1.2V (R1=154kΩ, R2=100kΩ) and 3.3V (R1=665kΩ, R2=100kΩ)-while maintaining ±1% accuracy and full protection coverage for each rail, all within the same LTC3315AACBZ-R7 device.
LTC3315AACBZ-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:
- 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:
- 2MHz
- 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)
LTC3315AACBZ-R7 FAQ
1.How can I place an order for LTC3315AACBZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3315AACBZ-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 LTC3315AACBZ-R7 reliable?
The price and inventory of LTC3315AACBZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3315AACBZ-R7 is usually 5 days.
3.What payment methods are accepted for LTC3315AACBZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3315AACBZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3315AACBZ-R7?
LTC3315AACBZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3315AACBZ-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 LTC3315AACBZ-R7?
For technical support, including LTC3315AACBZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3315AACBZ-R7 requirements.
6.How does Aetrix verify that LTC3315AACBZ-R7 is sourced from the original manufacturer or authorized distributors?
All LTC3315AACBZ-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 LTC3315AACBZ-R7 meets industry standards.
7.What is the process for return or replacement of LTC3315AACBZ-R7?
All LTC3315AACBZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with LTC3315AACBZ-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 LTC3315AACBZ-R7 part is unused and in its original packaging.
Return procedure for LTC3315AACBZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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