My Inquiry
My Account
Analog Devices Inc. LTC3822EDD#PBF
- Part No.:
- LTC3822EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3822EDD#PBF.pdf
- Description:
- IC REG CTRLR BUCK 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:240
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3822EDD#PBF from Analog Devices (formerly Linear Technology) is a no-RSENSE™ synchronous step-down DC/DC controller driving external N-channel MOSFETs for high-efficiency power conversion in low-input-voltage systems. It operates from 2.75V to 4.5V input, delivers up to 8A output at 1.8V with 550kHz switching, and achieves 99% duty cycle for ultra-low dropout operation - ideal for Li-ion battery-powered embedded systems.
For engineers reviewing the LTC3822EDD#PBF datasheet, LTC3822EDD#PBF pinout, LTC3822EDD#PBF application, or LTC3822EDD#PBF equivalent, key selection criteria include its VIN range (2.75–4.5V), ±1% 0.6V reference, selectable 300/550/750kHz frequency, ITH-controlled current limit, and digital RUN pin for precise enable/disable sequencing in space-constrained, thermally sensitive designs.
Technical Context
The LTC3822EDD#PBF implements constant-frequency current-mode control using MOSFET VDS sensing instead of external sense resistors, eliminating associated power loss and PCB area. Its architecture includes slope compensation above 20% duty cycle, anti-shoot-through gate drive logic, and internal soft-start with 650μs VFB ramp time.
It features dual N-channel gate drivers (TG/BG) with 40–50ns rise/fall times, BOOST pin supporting bootstrapped or auxiliary 5V gate drive, and integrated overvoltage protection triggered at 13.33% above 0.6V reference. The IPRG pin selects peak sense thresholds (82/120/200mV), directly determining maximum inductor current via RDS(ON) of the top MOSFET.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.75V to 4.5V - supports single-cell Li-ion (2.7–4.2V) and 3.3V rail systems without pre-regulation. |
| Reference Voltage | 0.6V ±1% - enables accurate output voltage setting (e.g., 1.8V with 59k/118k divider) across temperature. |
| Max Duty Cycle | 99% - ensures regulation down to VOUT ≈ 0.99 × VIN, critical for low-dropout operation near battery end-of-life. |
| Switching Frequency | Selectable 300/550/750kHz - balances efficiency (lower f) vs. component size (higher f); 550kHz nominal when FREQ pin floats. |
| Peak Sense Threshold | 82/120/200mV (via IPRG) - sets maximum ΔVSENSE = VIN–VSW, defining current limit without sense resistor. |
| Shutdown Quiescent Current | 7.5μA - minimizes battery drain during system sleep modes. |
| Operating Temp Range | –40°C to +85°C - qualified for industrial and portable equipment environments. |
Pinout & Package
The LTC3822EDD#PBF is housed in a thermally enhanced 10-lead (3mm × 3mm) plastic DFN package with exposed GND pad requiring soldering to PCB for thermal and electrical integrity (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BG (Pin 1) | Bottom gate driver output | Drives gate of synchronous N-MOSFET; swing = GND to BOOST - enables efficient low-side switching with minimal dead-time loss. |
| TG (Pin 2) | Top gate driver output | Drives gate of high-side N-MOSFET; swing = GND to BOOST - requires bootstrap capacitor (CB) for high-side drive above VIN. |
| BOOST (Pin 3) | Gate driver supply | Provides floating supply for TG; connected to CB between BOOST and SW - enables >VIN gate drive for full N-MOSFET enhancement. |
| VIN (Pin 4) | Main supply & current sense + | Powers control circuitry and serves as positive input to differential current comparator - must not be locally decoupled to preserve current sensing accuracy. |
| SW (Pin 5) | Switch node | Connects to source of top MOSFET, drain of bottom MOSFET, and inductor - serves as current sense – input and reverse-current detection point. |
| FREQ (Pin 6) | Frequency select | GND = 300kHz, float = 550kHz, VIN = 750kHz - allows optimization of inductor/capacitor size vs. efficiency trade-off. |
| IPRG (Pin 7) | Peak sense threshold select | VIN = 200mV, GND = 82mV, float = 120mV - configures current limit based on top MOSFET RDS(ON) without external components. |
| VFB (Pin 8) | Feedback input | Monitors output voltage via resistor divider; compared to 0.6V reference - enables precise regulation and OVP at 0.68V (13.33% overref). |
| ITH (Pin 9) | Error amp output & current threshold | Sets peak inductor current threshold (0.7–2V range); determines loop bandwidth and transient response - used for compensation and current limiting. |
| RUN (Pin 10) | Enable control | <1.1V = shutdown (7.5μA IQ), ≥1.1V = active - supports sequencing, power-good signaling, and controlled start-up with internal soft-start. |
Key Features
| Feature | Design Value |
|---|---|
| No external current sense resistor | Uses VDS sensing across top MOSFET (VIN–SW) - eliminates 0.5–2W sense resistor losses and associated board area in high-current designs. |
| All-N-channel MOSFET support | Integrated dual gate drivers with anti-shoot-through logic - enables higher efficiency than P-channel high-side solutions, especially below 3V input. |
| Digital RUN pin with soft-start | Enables precise power sequencing and limits inrush current; 650μs internal VFB ramp prevents output overshoot during start-up. |
| Output overvoltage protection | Hardware-comparator trips at 0.68V on VFB - shuts off TG and turns on BG to clamp VOUT during transients or feedback fault, protecting downstream ICs. |
| Selectable peak current threshold | IPRG pin configures 82/120/200mV sense window - allows optimization of current limit for different RDS(ON) MOSFETs without changing feedback network. |
Applications
| Portable Medical Sensors | Industrial IoT Edge Nodes |
|---|---|
Use Scenario: Battery-powered wearable ECG monitor requiring stable 1.8V/2A supply from 3.3V Li-ion rail with minimal heat generation. IC Role / Device Role / Timing Role: Synchronous buck controller regulating output while rejecting input ripple and load transients during signal acquisition. Use Value: 99% duty cycle maintains regulation down to 1.82V input; no sense resistor reduces thermal load in sealed enclosure. | Use Scenario: Wireless sensor node with MCU, RF transceiver, and analog front-end operating from 3.6V nominal Li-ion battery. IC Role / Device Role / Timing Role: Primary DC/DC controller delivering 1.8V core voltage with tight line/load regulation and low quiescent current in sleep mode. Use Value: 7.5μA shutdown IQ extends battery life; 550kHz switching enables compact 0805 inductors and ceramic capacitors. |
| Automotive Infotainment Displays | High-Density FPGA Power Rails |
Use Scenario: TFT-LCD backlight driver subsystem needing clean 2.5V/3A supply from 3.3V domain in automotive cabin environment (–40°C to +85°C). IC Role / Device Role / Timing Role: High-efficiency, thermally robust step-down controller with OVP and UVLO for safety-critical display power. Use Value: Exposed-pad DFN package dissipates heat effectively; ±1% reference ensures consistent brightness across temperature. | Use Scenario: Core voltage supply for Xilinx Artix-7 FPGA requiring 1.0V/6A with fast transient response during logic reconfiguration. IC Role / Device Role / Timing Role: Current-mode controller with ITH-based loop compensation enabling <10μs load-step recovery and precise current limiting. Use Value: Adjustable peak sense threshold (via IPRG) allows matching to low-RDS(ON) MOSFETs for <10mΩ total conduction loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | Integrated MOSFETs (3A), fixed 500kHz, no IPRG or BOOST pin - lacks external MOSFET flexibility and adjustable current limit. | Best for ≤3A, cost-sensitive designs where board space > efficiency; unsuitable for >5A or custom MOSFET optimization. | Select LTC3822EDD#PBF when external N-MOSFETs, >5A output, or programmable current limit are required. |
| LTC3850EGN#PBF | Wider VIN (4–36V), dual-phase, no VDS sensing - uses external sense resistor, higher minimum input voltage. | Targeted at 12V/24V industrial rails, not low-VIN battery systems; adds complexity for single-phase 3.3V use. | Choose LTC3822EDD#PBF for sub-4.5V inputs and no-resistor sensing; LTC3850 for higher-VIN, multi-phase, or higher-current scalability. |
Compared with MP2315DJ-LF-Z and LTC3850EGN#PBF, the LTC3822EDD#PBF uniquely combines no-RSENSE™ operation, 2.75V minimum input, and 99% duty cycle in a compact DFN - making it the only option among the three for high-efficiency, high-current, low-input-voltage synchronous buck control without sense resistors.
Availability
LTC3822EDD#PBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial IoT edge nodes, automotive infotainment displays, and high-density FPGA power rails requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC3822EDD#PBF 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, formed through the acquisition of Linear Technology in 2017.
The LTC3822EDD#PBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC controllers, designed specifically for space-constrained, thermally demanding applications requiring no external current sense resistors and ultra-low dropout operation.
FAQ
What is the minimum input voltage supported by the LTC3822EDD#PBF?
The LTC3822EDD#PBF supports a minimum input voltage of 2.75V, verified across the full –40°C to +85°C operating range. Below this level, undervoltage lockout (UVLO) disables the controller to prevent unstable operation. The rising UVLO threshold is 2.45V, and falling threshold is 2.15V, ensuring hysteresis for noise immunity. This makes the LTC3822EDD#PBF suitable for single-cell Li-ion batteries down to ~2.8V under load.
How does the IPRG pin affect current limiting in the LTC3822EDD#PBF?
The IPRG pin on the LTC3822EDD#PBF selects the maximum allowable peak sense voltage (ΔVSENSE(MAX)) between VIN and SW pins: 82mV when tied to GND, 120mV when floating, and 200mV when tied to VIN. This directly sets the peak inductor current limit as IPK = ΔVSENSE(MAX)/RDS(ON) of the top MOSFET. Slope compensation modifies this threshold above 20% duty cycle per Figure 1 in the datasheet, ensuring stability in continuous conduction mode.
Can the LTC3822EDD#PBF operate without a bootstrap capacitor?
No - the LTC3822EDD#PBF requires an external bootstrap capacitor (CB) connected between BOOST and SW pins to generate gate drive voltage >VIN for the top N-channel MOSFET. Without CB, TG cannot turn on fully, causing failure to regulate. A typical value is 100× the top MOSFET's total gate charge (QG). If a separate 5V supply is available, it can replace the bootstrap diode and capacitor for fixed 5V gate drive, but CB remains mandatory in standard configurations.
What is the purpose of the RUN pin on the LTC3822EDD#PBF?
The RUN pin on the LTC3822EDD#PBF provides digital enable/disable control: pulling it below 1.1V places the LTC3822EDD#PBF in shutdown mode, reducing quiescent current to 7.5μA and holding TG/BG outputs low. Releasing the pin allows an internal 0.7μA current source to pull it up to VIN, enabling the controller after reaching 1.1V. This pin also initiates the internal 650μs soft-start sequence, preventing output overshoot during power-up.
Does the LTC3822EDD#PBF include overvoltage protection, and how does it work?
Yes - the LTC3822EDD#PBF includes hardware-based output overvoltage protection (OVP). When the feedback voltage on VFB exceeds 0.68V (13.33% above the 0.6V reference), the OVP comparator triggers, immediately turning off the top gate driver (TG) and turning on the bottom gate driver (BG) to clamp the output. This action persists until VFB falls below the hysteresis threshold (0.66V), providing robust protection against feedback divider faults or transient surges without software intervention.
LTC3822EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- 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:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3822EDD#PBF FAQ
1.How can I place an order for LTC3822EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3822EDD#PBF 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#PBF reliable?
The price and inventory of LTC3822EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3822EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3822EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3822EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3822EDD#PBF?
LTC3822EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3822EDD#PBF 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#PBF?
For technical support, including LTC3822EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3822EDD#PBF requirements.
6.How does Aetrix verify that LTC3822EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3822EDD#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3822EDD#PBF?
All LTC3822EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3822EDD#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3822EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3822EDD#PBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
