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Analog Devices Inc. LTC3306AACBZ-1.2-R7
- Part No.:
- LTC3306AACBZ-1.2-R7
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFBGA, WLCSP
- Datasheet:
-
LTC3306AACBZ-1.2-R7.pdf
- Description:
- IC REG BUCK 1.2V 1.75A 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
LTC3306AACBZ-1.2-R7 from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering 1.75A output current from 2.25V–5.5V input, fixed 1.2V output, 2MHz switching frequency, and 22ns minimum on-time in a 6-pin 1.6mm × 1mm WLCSP package-designed for FPGA core power in space-constrained portable electronics.
For engineers reviewing the LTC3306AACBZ-1.2-R7 datasheet, LTC3306AACBZ-1.2-R7 pinout, LTC3306AACBZ-1.2-R7 application, or LTC3306AACBZ-1.2-R7 equivalent, this page delivers verified electrical specs, thermal limits, PGOOD behavior, mode selection (Burst Mode), and real-world layout guidance for POL designs requiring <9mm² solution size and ±1.0% VOUT accuracy.
Technical Context
The LTC3306AACBZ-1.2-R7 uses constant-frequency peak current mode control with internal compensation and a 2MHz oscillator, enabling fast transient response and stable regulation without external loop components. Its 22ns minimum on-time supports high VIN-to-VOUT ratios while maintaining regulation down to 100% duty cycle.
This variant operates in Burst Mode (LTC3306A option), suppressing reverse inductor current and disabling internal circuitry at light load to achieve ultra-low quiescent current (40µA sleeping, 1.2mA active), while retaining precise 400mV enable threshold with 50mV hysteresis and open-drain PGOOD with 100µs delay and 1%/2% hysteresis bands.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT | Fixed 1.2V ±1.0% - ensures stable core voltage for FPGA/ASIC logic under load transients. |
| Output Current | 1.75A continuous - sufficient for low-voltage digital core rails with margin for burst loads. |
| Switching Frequency | 2MHz typical - enables use of sub-1µH inductors and compact ceramic capacitors for <9mm² total solution size. |
| Min On-Time | 22ns - supports 1.2V output from 2.25V input (53% duty cycle) and maintains regulation during low-VIN dropout. |
| Efficiency | Peak >90% at 1.2V/1A (VIN=3.3V) - minimizes thermal rise in sealed or thermally constrained modules. |
| Quiescent Current | 40µA in Burst Mode sleep - extends battery life in always-on subsystems without sacrificing startup speed. |
| PGOOD Threshold | Rising: 98% VOUT, Falling: 96.8% VOUT - provides reliable power sequencing signal with noise immunity via 100µs delay. |
| Thermal Shutdown | 160°C typical activation - protects die and PCB during sustained overload or poor heatsinking. |
Pinout & Package
Package: 6-pin 1.6mm × 1mm, 0.5mm pitch WLCSP (flip-chip), rated for –40°C to +125°C junction temperature, θJA = 60°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD (A1) | Open-drain power-good indicator | Pulled low if VOUT < 96.8%, >110%, EN low, VIN < 2.25V, or thermal shutdown - requires external pull-up for system sequencing. |
| GND (A2) | Power ground and remote sense return | Must connect input/output capacitor negatives here to minimize noise coupling and ensure accurate current sensing. |
| EN (B1) | Enable with precision 400mV threshold | Active-high; 50mV hysteresis prevents chatter; tie directly to VIN for always-on operation. |
| SW (B2) | Switch node | Connects to inductor; requires short, wide trace to minimize EMI and switching losses. |
| VOUT (C1) | Fixed 1.2V regulated output | Not high-impedance - drives load directly; bypass with ≥22µF X5R/X7R ceramic close to pin. |
| VIN (C2) | Main power input | Supplies top switch and internal circuitry; bypass with ≥10µF X5R/X7R ceramic adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode operation | Reduces light-load quiescent current to 40µA while maintaining regulation - critical for battery-powered standby modes. |
| Internal soft-start | 0.25–3ms ramp time - prevents input surge and output overshoot during power-up or fault recovery. |
| Output overvoltage protection | Shuts off top switch if VOUT exceeds 110% nominal; PGOOD pulled low after 100µs - safeguards downstream logic from latch-up. |
| Valley current limiting | Bottom switch current limit of 2.3A (typ) - prevents inductor saturation and thermal runaway during short-circuit events. |
| 100% duty-cycle capability | Enables dropout operation down to VIN = VOUT + ILOAD × RDS(ON)_PMOS - preserves regulation during brownout conditions. |
| Low-noise design | No external compensation required; optimized for low EMI with integrated MOSFETs and controlled slew rates - simplifies compliance testing. |
Applications
| Mobile Baseband Processor Power | FPGA Core Supply |
|---|---|
Use Scenario: Powers ARM-based application processors in smartphones during LTE transmission bursts requiring rapid 1.2V rail stabilization. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 1.75A peak current with 2MHz switching to meet tight transient response requirements. Use Value: 22ns min on-time and peak current mode control enable sub-100ns load-step recovery, preventing processor reset during RF activity. | Use Scenario: Supplies configurable logic blocks in Xilinx Artix-7 FPGAs where core voltage must remain within ±1.0% during dynamic reconfiguration. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter providing clean, well-regulated 1.2V with PGOOD signaling for safe configuration sequencing. Use Value: Internal compensation and 2MHz operation allow full regulation with only 1µH inductor and 22µF output cap - fits within FPGA BGA keep-out zone. |
| Industrial IoT Sensor Hub | Wearable Health Monitor |
Use Scenario: Powers multi-sensor fusion module (accelerometer, gyroscope, BLE SoC) operating from single-cell Li-ion with variable load profile. IC Role / Device Role / Timing Role: High-efficiency step-down regulator in Burst Mode, enabling >30-day battery life in sleep state and instant wake-up response. Use Value: 40µA shutdown current and 1µA VIN quiescent current extend runtime; PGOOD confirms rail readiness before sensor sampling. | Use Scenario: Supplies ultra-low-power MCU and optical heart-rate sensor in wrist-worn device where board area is limited to <12mm². IC Role / Device Role / Timing Role: Space-optimized 1.6mm × 1mm WLCSP regulator delivering 1.2V with minimal external components. Use Value: Complete solution occupies <9mm² - frees PCB area for antenna routing and battery integration without compromising efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS6286412ARQYR | 1.2V fixed, 2.5A, 4MHz, 1.1mm × 0.7mm DSBGA - higher current, faster switching, smaller package but no Burst Mode. | Preferred for higher-current apps needing faster transient response; unsuitable where ultra-low IQ (<1µA) in deep sleep is required. | Select TPS6286412ARQYR when output current >1.75A or footprint <1.1mm × 0.7mm is mandatory; verify thermal performance at 2.5A. |
| RTQ2134BGQW | 1.2V fixed, 2A, 2MHz, 1.6mm × 1.6mm QFN - includes spread-spectrum clocking and adjustable soft-start, but larger footprint and no WLCSP option. | Better EMI performance in noise-sensitive medical devices; less suitable for ultra-thin wearables due to 0.55mm height and QFN soldering complexity. | Choose RTQ2134BGQW for EMI-critical environments like clinical monitors; confirm PCB stencil design supports 0.4mm pitch QFN. |
Compared with TPS6286412ARQYR and RTQ2134BGQW, the LTC3306AACBZ-1.2-R7 uniquely balances ultra-small WLCSP footprint, Burst Mode IQ, and guaranteed ±1.0% accuracy across –40°C to +125°C - making it optimal for thermally constrained, battery-sensitive portable electronics where layout area is premium.
Availability
LTC3306AACBZ-1.2-R7 is available at Aetrix Electronics and suitable for FPGA core supplies, wearable health monitors, and industrial IoT sensor hubs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature extremes.
Supply support for LTC3306AACBZ-1.2-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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3306 product line delivers ultra-compact, high-efficiency synchronous buck regulators for space- and power-constrained portable electronics, emphasizing minimal solution size, robust protection, and seamless integration into dense PCB layouts.
FAQ
What is the maximum output current capability of the LTC3306AACBZ-1.2-R7?
The LTC3306AACBZ-1.2-R7 delivers up to 1.75A average output current continuously under specified thermal conditions (TJ ≤ 125°C). Peak current capability reaches 2.75A (typical top switch limit), but sustained operation above 1.75A requires careful thermal management using the 1.6mm × 1mm WLCSP's low θJA of 60°C/W and proper PCB copper pour.
Does the LTC3306AACBZ-1.2-R7 support forced continuous conduction mode (FCCM)?
No - the LTC3306AACBZ-1.2-R7 is the "A" grade variant configured exclusively for Burst Mode operation, which disables reverse inductor current and reduces quiescent current to 40µA at light load. For forced continuous mode, select the LTC3306CACBZ-1.2-R7 ("C" grade), which maintains fixed-frequency switching even at zero load.
How does the PGOOD pin behave during startup and fault conditions for the LTC3306AACBZ-1.2-R7?
The PGOOD pin on the LTC3306AACBZ-1.2-R7 is open-drain and remains low until VOUT rises above 98% of 1.2V (1.176V), then transitions high-impedance (requiring external pull-up). It pulls low again if VOUT drops below 96.8% (1.162V), exceeds 110% (1.32V), EN goes low, VIN falls below 2.25V, or thermal shutdown activates - all with 100µs delay and built-in hysteresis.
Can the LTC3306AACBZ-1.2-R7 operate with input voltage as low as 2.25V while maintaining 1.2V output?
Yes - the LTC3306AACBZ-1.2-R7 supports 100% duty cycle operation, allowing it to maintain regulation down to VIN = VOUT + ILOAD × RDS(ON)_PMOS. At 1.75A load, with typical PMOS RDS(ON) of 100mΩ, dropout occurs near VIN = 1.2V + 0.175V = 1.375V; however, minimum specified VIN is 2.25V to guarantee full functionality including PGOOD, soft-start, and protection features.
What is the recommended output capacitor for stable operation of the LTC3306AACBZ-1.2-R7?
Analog Devices specifies ≥22µF X5R or X7R ceramic capacitor at the VOUT pin for the LTC3306AACBZ-1.2-R7, placed as close as possible to the WLCSP pads. This value ensures adequate energy storage for load transients, maintains control-loop stability with internal compensation, and minimizes output ripple - lower values risk instability or excessive droop during 1A+ load steps.
LTC3306AACBZ-1.2-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-WFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.75A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WLCSP (1.64x1.03)
LTC3306AACBZ-1.2-R7 FAQ
1.How can I place an order for LTC3306AACBZ-1.2-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3306AACBZ-1.2-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 LTC3306AACBZ-1.2-R7 reliable?
The price and inventory of LTC3306AACBZ-1.2-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3306AACBZ-1.2-R7 is usually 5 days.
3.What payment methods are accepted for LTC3306AACBZ-1.2-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3306AACBZ-1.2-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3306AACBZ-1.2-R7?
LTC3306AACBZ-1.2-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3306AACBZ-1.2-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 LTC3306AACBZ-1.2-R7?
For technical support, including LTC3306AACBZ-1.2-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3306AACBZ-1.2-R7 requirements.
6.How does Aetrix verify that LTC3306AACBZ-1.2-R7 is sourced from the original manufacturer or authorized distributors?
All LTC3306AACBZ-1.2-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 LTC3306AACBZ-1.2-R7 meets industry standards.
7.What is the process for return or replacement of LTC3306AACBZ-1.2-R7?
All LTC3306AACBZ-1.2-R7 units undergo pre-shipment inspection (PSI). If there is an issue with LTC3306AACBZ-1.2-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 LTC3306AACBZ-1.2-R7 part is unused and in its original packaging.
Return procedure for LTC3306AACBZ-1.2-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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