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Analog Devices Inc. LTC3306AACBZ-R7
- Part No.:
- LTC3306AACBZ-R7
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFBGA, WLCSP
- Datasheet:
-
LTC3306AACBZ-R7.pdf
- Description:
- IC REG BUCK PROG 1.75A 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,895
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Product details
Overview
LTC3306AACBZ-R7 from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 1.75A output current from a 2.25V–5.5V input, operating at 2MHz with 22ns minimum on-time and ±1.0% VOUT accuracy. It features peak current mode control, internal compensation, and supports both forced continuous mode (FCM) and low-ripple Burst Mode operation for optimized noise-efficiency trade-offs in space-constrained power rails.
For engineers reviewing the LTC3306AACBZ-R7 datasheet, LTC3306AACBZ-R7 pinout, LTC3306AACBZ-R7 application, or LTC3306AACBZ-R7 equivalent, this device serves as a high-density, thermally robust solution for FPGA core supplies, industrial POL converters, and battery-powered systems requiring fast transient response and sub-1mm² footprint.
Technical Context
The LTC3306AACBZ-R7 implements constant-frequency peak current mode control with a factory-set 2MHz oscillator and 22ns minimum on-time, enabling stable regulation down to 0.5V output while supporting 100% duty cycle for ultra-low dropout. Its integrated 30mΩ NMOS and 100mΩ PMOS power switches deliver high efficiency across load range without external MOSFETs.
It integrates precision enable (400mV threshold, 50mV hysteresis), open-drain PGOOD with 98% rising/97% falling thresholds and 100μs delay, output overvoltage protection (110% VOUT), thermal shutdown (160°C), and short-circuit recovery via valley-current limiting - all within a 6-pin 1.6mm × 1mm WLCSP package rated for –40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports single-cell Li-ion, USB, and industrial 3.3V/5V rails without external LDO pre-regulation. |
| Output Voltage | Fixed 1.2V (LTC3306AACBZ-R7 variant) - factory-programmed, ±1.0% accuracy over temperature and line/load. |
| Switching Frequency | 2MHz - enables use of compact 1µH inductors and reduces EMI fundamental frequency above sensitive bands. |
| Max Output Current | 1.75A average - sustained under thermal limits with θJA = 60°C/W and proper PCB copper area. |
| Top/Bottom RDS(ON) | 30mΩ / 100mΩ - minimizes conduction loss at high load; NMOS dominates efficiency above ~300mA. |
| Min On-Time | 22ns - allows high VIN-to-VOUT step-down ratios (e.g., 5.5V→1.2V at ~22% duty cycle) without pulse-skipping instability. |
| PGOOD Threshold | Rising: 98% VOUT, Falling: 97% VOUT - provides reliable system power sequencing with 1% hysteresis and 100μs debounce. |
Pinout & Package
Package: 6-pin 1.6mm × 1mm, 0.5mm pitch WLCSP (flip-chip, bottom-soldered). Thermal performance: θJC = 1.5°C/W, θJA = 60°C/W. Requires solder mask defined pads and controlled reflow per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD (A1) | Open-drain power-good indicator | Pulled low during UVLO, OV, thermal shutdown, or EN = low; requires external pull-up for logic-level signaling. |
| GND (A2) | Power ground and remote sense return | Must be connected to input/output capacitor negatives with minimal trace inductance to ensure stability and accurate sensing. |
| EN (B1) | Enable control with precision threshold | 400mV rising threshold (±25mV) enables programmable UVLO via resistor divider; floating prohibited. |
| SW (B2) | Switch node | Connects directly to inductor; requires short, wide copper pour to minimize switching loop inductance and EMI. |
| VOUT (C1) | Regulated output voltage pin | Fixed 1.2V output; connects to output capacitor and load; not high-impedance - no external feedback required. |
| VIN (C2) | Main input supply | Supplies internal circuitry and top switch; bypass with ≥10µF X5R/X7R ceramic capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Forced Continuous Mode (FCM) | Enables fixed 2MHz operation with consistent ripple and predictable EMI spectrum - ideal for noise-sensitive analog/RF sections. |
| Burst Mode® Operation | Reduces quiescent current to 40µA at light load while maintaining <10mVpp output ripple - extends battery life in standby. |
| Internal Soft-Start | 0.25–3ms ramp time prevents input surge and output overshoot during startup or fault recovery. |
| Output Overvoltage Protection | Shuts off top switch if VOUT exceeds 110% nominal; PGOOD pulled low after 100µs delay - safeguards downstream logic. |
| Thermal Shutdown | Disables switching at TJ = 160°C (typ), resumes at 155°C (typ); protects IC and PCB during overload or poor heatsinking. |
Applications
| Mobile Baseband Processor Core Supply | FPGA I/O Bank Power |
|---|---|
Use Scenario: Powers ARM-based application processors in smartphones and tablets from single-cell Li-ion (3.0V–4.2V). IC Role / Device Role / Timing Role: Primary core regulator delivering tightly regulated 1.2V at up to 1.75A with fast load-step response to CPU DVFS transitions. Use Value: 22ns min-on-time and 2MHz switching maintain regulation during deep discharge (VIN = 2.8V), while Burst Mode extends standby time. |
Use Scenario: Supplies configurable I/O banks in Xilinx Artix-7 or Intel Cyclone V FPGAs requiring clean, sequenced 1.2V/1.8V rails. IC Role / Device Role / Timing Role: Point-of-load converter with PGOOD signaling for FPGA configuration sequencing and rail monitoring. Use Value: Fixed 1.2V output eliminates external resistors; ±1.0% accuracy ensures I/O timing margin compliance across temperature. |
| Industrial Sensor Node POL Converter | Medical Wearable Low-Noise Bias Rail |
Use Scenario: Powers ultra-low-power microcontrollers (e.g., STM32L4) and MEMS sensors in battery-operated IIoT edge nodes. IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating from 3.3V industrial bus or coin cell with shutdown control. Use Value: 1µA shutdown current and 40µA Burst Mode IQ enable multi-year battery life; WLCSP footprint fits compact PCBs. |
Use Scenario: Generates ultra-low-noise 1.2V bias for analog front-ends (AFE) in portable ECG or pulse oximetry devices. IC Role / Device Role / Timing Role: Low-ripple FCM-mode regulator minimizing switching artifacts in sensitive analog signal paths. Use Value: Forced Continuous Mode delivers <5mVpp ripple at 1.75A; internal compensation avoids external compensation components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS6286418RTER | 1.8V fixed output, 2.5V–5.5V input, 2.2MHz, 2A rating, 0.5mm-pitch 6-WSON | Higher output voltage; lacks PGOOD and overvoltage protection; lower thermal resistance (θJA = 45°C/W) | Select when 1.8V output is required and PGOOD is handled externally; verify layout compatibility with WSON vs WLCSP. |
| MP2152GQVE-12-P | 1.2V fixed, 2.5V–5.5V input, 2MHz, 2A, 0.4mm-pitch 8-QFN, includes spread-spectrum | 8-pin QFN (larger footprint), spread-spectrum EMI reduction, no Burst Mode - higher light-load IQ (65µA) | Prefer for EMI-critical designs where board area permits larger package; avoid if ultra-low standby power is mandatory. |
Compared with TPS6286418RTER and MP2152GQVE-12-P, the LTC3306AACBZ-R7 offers superior light-load efficiency via Burst Mode, integrated overvoltage protection, and the smallest footprint (1.6mm × 1mm), making it optimal for size- and battery-life-constrained applications despite its narrower 2.25V VIN minimum.
Availability
LTC3306AACBZ-R7 is available at Aetrix Electronics and suitable for FPGA core supplies, industrial point-of-load converters, and medical wearable power rails requiring stable component supply, long-term lifecycle support, and AEC-Q200–compatible thermal reliability.
Supply support for LTC3306AACBZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and power management markets since 1965.
The LTC3306 series was designed specifically for ultra-compact, high-efficiency DC/DC conversion in space-constrained portable and industrial electronics - emphasizing minimal external components, robust protection, and seamless integration into dense PCB layouts.
FAQ
What is the operating temperature range for the LTC3306AACBZ-R7?
The LTC3306AACBZ-R7 is specified for an operating junction temperature range of –40°C to +125°C. Its WLCSP package has θJA = 60°C/W, so ambient temperature capability depends on PCB copper area and power dissipation. Derating is required above 125°C junction; thermal shutdown activates at 160°C (typ) to prevent damage.
Does the LTC3306AACBZ-R7 require external compensation components?
No, the LTC3306AACBZ-R7 features internal compensation optimized for standard 1µH inductors and 22µF ceramic output capacitors. This eliminates external compensation networks, reduces BOM count, and ensures stable operation across the full 0.5V–3.65V output range without tuning.
Can the LTC3306AACBZ-R7 operate with a 2.25V input supply?
Yes, the LTC3306AACBZ-R7 supports VIN as low as 2.25V, enabling direct operation from deeply discharged Li-ion cells or low-voltage industrial rails. At 2.25V input and 1.2V output, it achieves ~53% duty cycle and maintains regulation with 22ns minimum on-time - critical for high step-down ratios.
How does the PGOOD function behave during startup and fault conditions?
The LTC3306AACBZ-R7's PGOOD pin goes high-impedance only when VOUT reaches ≥98% of 1.2V and remains stable for 100µs. It pulls low during startup, EN = low, VIN UVLO (<2.2V), VOUT overvoltage (>1.32V), or thermal shutdown - providing unambiguous system power status for sequencing controllers.
Is the LTC3306AACBZ-R7 pin-compatible with other variants in the LTC3306 family?
Yes, all LTC3306 WLCSP variants (including LTC3306AACBZ-R7, LTC3306CACBZ-R7, and fixed-output versions) share identical 6-pin 1.6mm × 1mm WLCSP pinout and footprint. Only the internal configuration (FCM vs Burst Mode, fixed vs adjustable VOUT) differs - enabling design reuse across voltage and efficiency requirements.
LTC3306AACBZ-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:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 3.65V
- 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-R7 FAQ
1.How can I place an order for LTC3306AACBZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3306AACBZ-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-R7 reliable?
The price and inventory of LTC3306AACBZ-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-R7 is usually 5 days.
3.What payment methods are accepted for LTC3306AACBZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3306AACBZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3306AACBZ-R7?
LTC3306AACBZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3306AACBZ-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-R7?
For technical support, including LTC3306AACBZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3306AACBZ-R7 requirements.
6.How does Aetrix verify that LTC3306AACBZ-R7 is sourced from the original manufacturer or authorized distributors?
All LTC3306AACBZ-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-R7 meets industry standards.
7.What is the process for return or replacement of LTC3306AACBZ-R7?
All LTC3306AACBZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with LTC3306AACBZ-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-R7 part is unused and in its original packaging.
Return procedure for LTC3306AACBZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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