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Analog Devices Inc. LTC3822EDD-1#TRPBF
- Part No.:
- LTC3822EDD-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3822EDD-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,168
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Product details
Overview
LTC3822EDD-1#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down DC/DC controller IC that drives external N-channel MOSFETs without requiring a current-sense resistor, using VDS sensing across the top MOSFET. It operates from 2.75V to 4.5V input, delivers up to 8A output at 1.8V with ±1% reference accuracy, and supports 99% duty cycle for low-dropout operation in Li-ion-powered systems.
For engineers reviewing the LTC3822EDD-1#TRPBF datasheet, LTC3822EDD-1#TRPBF pinout, LTC3822EDD-1#TRPBF application, or LTC3822EDD-1#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed light-load mode selection options (Burst Mode®/pulse skipping/forced continuous), exact package mapping to 12-pin 3mm × 3mm DFN, and two manufacturer-validated alternative controllers for 3.3V-input synchronous buck designs.
Technical Context
The LTC3822EDD-1#TRPBF implements constant-frequency current-mode control with MOSFET VDS sensing - eliminating RSENSE while maintaining precise peak-current limiting via ITH voltage feedback and programmable ΔVSENSE(MAX) (82mV/125mV/200mV) selected by IPRG pin state. Its architecture includes internal soft-start, tracking capability, and digital RUN control enabling micropower shutdown (IQ = 7.5µA).
Frequency is adjustable from 250kHz to 750kHz via PLLLPF pin or synchronizable externally over the same range; phase-locking uses an external RC filter on PLLLPF. Output overvoltage protection triggers at +13.33% of 0.6V reference (0.68V), and undervoltage lockout activates at VIN < 2.25V (rising) with hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.75V to 4.5V - optimized for single-cell Li-ion (3.3V nominal) and 3.3V rail systems |
| Reference Voltage Accuracy | ±1% at 0.6V - ensures stable output regulation under line/load transients |
| Max Duty Cycle | 99% - enables ultra-low dropout operation when VIN ≈ VOUT |
| Switching Frequency Range | 250kHz to 750kHz - balances efficiency vs. component size; supports external sync |
| Quiescent Current (Shutdown) | 7.5µA - extends battery life in always-on portable systems |
| Peak Current Sense Threshold | Programmable: 82mV (IPRG = GND), 125mV (IPRG = float), 200mV (IPRG = VIN) - sets max MOSFET conduction loss |
| Light-Load Operation Modes | Burst Mode®, pulse skipping, or forced continuous - selectable via SYNC/MODE pin voltage |
Pinout & Package
Package: 12-pin 3mm × 3mm thermally enhanced DFN (DD) with exposed pad (Pin 13) soldered to PCB ground for electrical integrity and thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 12) | Switch node connection | Connects to source of top MOSFET, drain of bottom MOSFET, and inductor; serves as negative current sense input |
| TG (Pin 9) | Top gate driver output | Drives gate of external high-side N-MOSFET with swing from GND to BOOST voltage |
| BG (Pin 8) | Bottom gate driver output | Drives gate of external low-side N-MOSFET with swing from GND to BOOST voltage |
| VIN (Pin 11) | Main power supply input | Powers control circuitry and serves as positive input to differential current comparator |
| BOOST (Pin 10) | Bootstrap supply rail | Provides gate drive voltage for TG; requires external Schottky diode and capacitor between BOOST and SW |
| ITH (Pin 5) | Error amplifier output & current threshold | Sets peak inductor current limit; nominal operating range 0.7V–2.0V |
| VFB (Pin 4) | Feedback input | Compares remote output voltage (via resistor divider) to 0.6V internal reference |
| RUN (Pin 6) | Digital enable/disable control | Logic-high (≥1.1V) enables operation; logic-low (<1.1V) shuts down IC with 7.5µA IQ |
| TRACK/SS (Pin 3) | Tracking/soft-start input | Enables output voltage tracking of external rail or external soft-start timing via capacitor |
| SYNC/MODE (Pin 2) | Frequency sync & light-load mode select | Accepts external clock (250–750kHz) or DC voltage to select Burst Mode®/pulse skipping/forced continuous |
| PLLLPF (Pin 1) | Frequency select & PLL compensation | Configures oscillator frequency (300/550/750kHz) or hosts RC filter for phase-lock loop |
| IPRG (Pin 7) | Peak sense threshold select | Three-state input (GND/float/VIN) selects 82/125/200mV ΔVSENSE(MAX) for MOSFET RDS(ON) optimization |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE required | Uses VDS sensing across top MOSFET to eliminate sense resistor losses and PCB area |
| 99% maximum duty cycle | Enables operation with VIN as low as ~1.82V for 1.8V output - critical for battery end-of-life support |
| Selectable light-load modes | Burst Mode® (highest efficiency), pulse skipping (low ripple/no audio noise), or forced continuous (lowest ripple) |
| Internal 1ms soft-start + external tracking | Prevents inrush current; TRACK/SS pin allows coordinated startup with other rails or custom ramp timing |
| Output overvoltage protection | Shuts off top MOSFET and turns on bottom MOSFET if VFB exceeds 0.68V - protects downstream loads |
| Micropower shutdown | Draws only 7.5µA in shutdown - suitable for energy-sensitive portable and IoT applications |
Applications
| Li-Ion Powered Portable Devices | 3.3V Input Point-of-Load Regulation |
|---|---|
Use Scenario: Power management in handheld medical monitors, wearables, and barcode scanners powered by single-cell Li-ion batteries (2.7–4.2V). IC Role / Device Role / Timing Role: Synchronous buck controller regulating 1.8V/3.3V rails from varying battery voltage; manages light-load efficiency via Burst Mode®. Use Value: Extends runtime by >30% at 10mA load vs. forced continuous mode; maintains regulation down to 2.75V input. |
Use Scenario: Local DC/DC conversion for FPGA I/O banks, microcontroller cores, or sensor interfaces supplied from a fixed 3.3V system rail. IC Role / Device Role / Timing Role: High-efficiency, low-noise point-of-load controller with programmable frequency and external sync for EMI control. Use Value: Enables use of compact 0.47µH inductors and ceramic capacitors; reduces solution size by 40% vs. legacy controllers. |
| Multi-Rail Tracking Power Sequencing | Low-Noise Industrial Sensor Supplies |
Use Scenario: Coordinated startup of multiple voltage rails (e.g., 1.2V core, 1.8V I/O, 3.3V analog) in test equipment and programmable logic controllers. IC Role / Device Role / Timing Role: Tracks external reference voltage via TRACK/SS pin to ensure monotonic, glitch-free power-up sequence. Use Value: Eliminates need for external sequencing ICs; achieves <±1% tracking accuracy across temperature. |
Use Scenario: Clean, low-ripple power for precision ADCs, DACs, and MEMS sensors in factory automation and instrumentation. IC Role / Device Role / Timing Role: Operates in forced continuous or pulse skipping mode to suppress audible noise and minimize conducted EMI. Use Value: Delivers <10mVpp output ripple at full load; avoids 20–200Hz switching artifacts that corrupt sensor measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3850EDD#TRPBF | Higher max frequency (1MHz), integrated bootstrap diode, no IPRG pin - fixed 50mV current sense threshold | Requires smaller magnetics but lacks programmable ΔVSENSE(MAX); less flexible for high-current MOSFET optimization | Preferred when board space is critical and RDS(ON) is tightly controlled; not drop-in due to different pinout and sense architecture |
| TPS54620RGYR | Fixed 600kHz frequency, integrated MOSFET drivers only (no external FET control), no VDS sensing - requires sense resistor | Lower BOM count but sacrifices efficiency at light loads and flexibility in MOSFET selection | Selected for cost-sensitive, medium-power apps where 95% peak efficiency suffices and layout simplicity outweighs fine-grained control |
Compared with LTC3822EDD-1#TRPBF, LTC3850EDD#TRPBF offers higher frequency and integration but forfeits VDS sensing and programmable current limit; TPS54620RGYR simplifies design with integrated FETs but adds conduction loss and reduces light-load efficiency by ~8% at 10mA.
Availability
LTC3822EDD-1#TRPBF is available at Aetrix Electronics and suitable for Li-ion-powered portable devices, 3.3V input point-of-load regulation, multi-rail tracking power sequencing, and low-noise industrial sensor supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3822EDD-1#TRPBF 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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3822EDD-1#TRPBF belongs to Linear's high-efficiency synchronous buck controller product line, designed specifically for low-input-voltage, high-current DC/DC conversion in battery-powered and space-constrained systems where RSENSE-free operation and light-load efficiency are critical.
FAQ
What is the function of the IPRG pin on the LTC3822EDD-1#TRPBF?
The IPRG pin on the LTC3822EDD-1#TRPBF selects the maximum allowable peak current sense voltage (ΔVSENSE(MAX)) across the top MOSFET: 82mV when tied to GND, 125mV when floating, and 200mV when tied to VIN. This setting directly determines the peak inductor current limit and enables optimization of RDS(ON) trade-offs for specific MOSFETs in the LTC3822EDD-1#TRPBF design.
Does the LTC3822EDD-1#TRPBF require an external current-sense resistor?
No, the LTC3822EDD-1#TRPBF does not require an external current-sense resistor. It uses MOSFET VDS sensing between the VIN and SW pins to measure current, eliminating sense resistor losses and PCB area. This architecture is explicitly confirmed in the device description, features list, and functional diagram of the LTC3822EDD-1#TRPBF datasheet.
What package type is used by the LTC3822EDD-1#TRPBF?
The LTC3822EDD-1#TRPBF uses a 12-pin 3mm × 3mm thermally enhanced DFN package (DD package), with Pin 13 as the exposed ground pad that must be soldered to the PCB for optimal thermal performance (θJA = 43°C/W). This is distinct from the 16-pin SSOP variant (LTC3822EGN-1) and is clearly specified in the PACKAGE/ORDER INFORMATION section for LTC3822EDD-1#TRPBF.
How does the LTC3822EDD-1#TRPBF achieve high efficiency at light loads?
The LTC3822EDD-1#TRPBF achieves high light-load efficiency through selectable operating modes: Burst Mode® (enabling deep sleep with 7.5µA quiescent current), pulse skipping (reducing switching events while maintaining low ripple), or forced continuous (for lowest noise). The mode is selected via DC voltage on the SYNC/MODE pin - a confirmed feature documented in the Applications Information and Electrical Characteristics tables for LTC3822EDD-1#TRPBF.
Can the LTC3822EDD-1#TRPBF be synchronized to an external clock?
Yes, the LTC3822EDD-1#TRPBF can be synchronized to an external clock applied to the SYNC/MODE pin over a range of 250kHz to 750kHz. When synchronized, the internal oscillator phase-locks to the external signal, and an RC network must be connected from PLLLPF to GND to serve as the PLL loop filter - a capability explicitly detailed in the Frequency Selection and Phase-Locked Loop section of the LTC3822EDD-1#TRPBF datasheet.
LTC3822EDD-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 2.75V ~ 4.5V
- Frequency - Switching:
- 300kHz, 550kHz, 750kHz
- Duty Cycle (Max):
- 99%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (3x3)
LTC3822EDD-1#TRPBF FAQ
1.How can I place an order for LTC3822EDD-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3822EDD-1#TRPBF 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 LTC3822EDD-1#TRPBF reliable?
The price and inventory of LTC3822EDD-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3822EDD-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3822EDD-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3822EDD-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3822EDD-1#TRPBF?
LTC3822EDD-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3822EDD-1#TRPBF 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 LTC3822EDD-1#TRPBF?
For technical support, including LTC3822EDD-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3822EDD-1#TRPBF requirements.
6.How does Aetrix verify that LTC3822EDD-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3822EDD-1#TRPBF 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 LTC3822EDD-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3822EDD-1#TRPBF?
All LTC3822EDD-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3822EDD-1#TRPBF, 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 LTC3822EDD-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3822EDD-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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