My Inquiry
My Account
Analog Devices Inc. LTC3822EDD-1#PBF
- Part No.:
- LTC3822EDD-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3822EDD-1#PBF.pdf
- Description:
- IC REG CTRLR BUCK 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:195
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3822EDD-1#PBF 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. It operates from 2.75V to 4.5V input, delivers up to 8A output at 1.8V with ±1% reference accuracy, and supports 250kHz–750kHz programmable switching frequency in a thermally enhanced 12-pin 3mm × 3mm DFN package.
For engineers reviewing the LTC3822EDD-1#PBF datasheet, LTC3822EDD-1#PBF pinout, LTC3822EDD-1#PBF application, or LTC3822EDD-1#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed light-load operation modes (Burst Mode®/pulse skipping/forced continuous), exact package mapping to DD12, and two manufacturer-validated alternative controllers for Li-ion and 3.3V input systems.
Technical Context
The LTC3822EDD-1#PBF implements constant-frequency current-mode control using VDS sensing across the top MOSFET to eliminate sense resistors. Its error amplifier regulates VFB to 0.6V ±1%, with ITH pin voltage setting peak current threshold and enabling slope compensation above 20% duty cycle.
It integrates digital RUN control, TRACK/SS for output tracking or external soft-start, SYNC/MODE for mode selection or external clock synchronization (250–750kHz), and IPRG for three-state peak sense voltage selection (82/125/200mV). Output overvoltage protection triggers at VFB = 0.68V with 20mV hysteresis, and shutdown draws only 7.5µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.75V to 4.5V - supports single-cell Li-ion (2.7–4.2V) and regulated 3.3V rails without derating. |
| Feedback Reference | 0.6V ±1% - enables precise output regulation; load/line regulation ≤0.5% ensures stability under varying conditions. |
| Max Duty Cycle | 99% - allows ultra-low dropout operation (e.g., VIN = 3.3V → VOUT = 1.8V) extending battery runtime. |
| Switching Frequency | 250kHz to 750kHz - programmable via PLLLPF/SYNC/MODE; enables optimization of inductor size vs. efficiency. |
| Quiescent Current | 7.5µA in shutdown - minimizes battery drain during system sleep states. |
| Peak Sense Threshold | Selectable 82/125/200mV via IPRG - sets maximum ΔVSENSE across top MOSFET for accurate current limiting. |
| Light-Load Modes | Burst Mode®, pulse skipping, or forced continuous - selectable via SYNC/MODE pin for efficiency/noise tradeoffs. |
Pinout & Package
The LTC3822EDD-1#PBF is housed in a thermally enhanced 12-pin DFN package (3mm × 3mm) with exposed pad (Pin 13) soldered to PCB ground for electrical continuity and thermal dissipation (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 comparator input. |
| TG (Pin 9) | Top gate driver output | Drives gate of external N-channel top MOSFET with swing from GND to BOOST voltage. |
| BG (Pin 8) | Bottom gate driver output | Drives gate of external N-channel bottom MOSFET with swing from GND to BOOST voltage. |
| VIN (Pin 11) | Main supply input | Powers control circuitry and serves as positive input to differential current comparator. |
| BOOST (Pin 10) | Gate driver bootstrap supply | Connects to bootstrapped capacitor (SW–BOOST) to generate gate drive voltage > VIN for top MOSFET. |
| ITH (Pin 5) | Error amp compensation / current threshold | Sets peak inductor current limit; nominal range 0.7V–2V; clamped to enable precise current control. |
| VFB (Pin 4) | Feedback input | Receives scaled output voltage; controller regulates VFB to 0.6V reference for stable output regulation. |
| RUN (Pin 6) | Enable/disable control | Logic-high (≥1.1V) enables operation; <1.1V forces shutdown drawing only 7.5µA. |
| IPRG (Pin 7) | Peak sense threshold select | Three-state input: GND=82mV, float=125mV, VIN=200mV - configures ΔVSENSE(MAX) for MOSFET RDS(ON) matching. |
| SYNC/MODE (Pin 2) | Mode control / sync input | Selects Burst Mode® (tied to VIN), forced continuous (GND), pulse skipping (0.4–1.2V), or external clock sync (250–750kHz). |
| PLLLPF (Pin 1) | Frequency select / PLL filter | Sets oscillator frequency: GND=300kHz, float=550kHz, VIN=750kHz; or connects RC network for PLL lock when synced. |
| TRACK/SS (Pin 3) | Tracking / soft-start input | Enables output voltage tracking of external rail or external soft-start via capacitor; internal 1µA pull-up enables 1ms ramp. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE required | VDS sensing across top MOSFET eliminates power loss and board space of discrete sense resistor. |
| 99% max duty cycle | Enables low-dropout operation critical for battery-powered systems where input voltage approaches output voltage. |
| ±1% 0.6V reference | Ensures tight output voltage tolerance across temperature and line/load variations without external trimming. |
| Three light-load modes | Engineers select Burst Mode® (highest efficiency), pulse skipping (low ripple/audio noise), or forced continuous (lowest ripple) via one pin. |
| Digital RUN control | Active-high enable with 1.1V threshold allows direct interfacing with microcontroller GPIOs or power sequencers. |
Applications
| Li-Ion Powered Portable Devices | 3.3V Input Point-of-Load Regulation |
|---|---|
Use Scenario: Power management in handheld medical monitors, wearables, and IoT sensors 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 variable battery voltage with high light-load efficiency. Use Value: 99% duty cycle maintains regulation down to 1.85V input; Burst Mode® extends runtime by reducing quiescent current to 7.5µA in sleep. | Use Scenario: Local DC/DC conversion for FPGA I/O banks, microcontroller cores, or memory interfaces fed from a stable 3.3V system rail. IC Role / Device Role / Timing Role: High-efficiency, low-noise step-down controller delivering up to 8A with precise 0.6V reference and fast transient response. Use Value: ±1% reference and current-mode architecture ensure <0.5% load/line regulation; 750kHz operation enables compact 0.47µH inductors. |
| Multi-Rail Power Sequencing Systems | Industrial Control Modules |
Use Scenario: Coordinated startup of multiple voltage rails (e.g., 1.2V core, 1.8V I/O, 3.3V analog) in programmable logic controllers or motor drives. IC Role / Device Role / Timing Role: Controller with TRACK/SS pin enabling output voltage to track an external reference or master rail during startup. Use Value: External resistor divider on TRACK/SS allows precise sequencing alignment; internal soft-start prevents inrush current on all rails. | Use Scenario: Reliable power conversion in DIN-rail mounted PLCs, sensor transmitters, or fieldbus gateways operating in –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Robust buck controller with undervoltage lockout (2.25V threshold), overvoltage protection (0.68V trip), and thermal-enhanced DFN package. Use Value: UVLO prevents erratic operation near battery depletion; exposed-pad DFN ensures thermal reliability at full load in enclosed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3822EGN-1#PBF | 16-pin narrow SSOP package with PGOOD pin; θJA = 110°C/W; no exposed pad | Required where board layout needs PGOOD monitoring or SSOP footprint compatibility | Select when system-level power-good signaling is mandatory or DFN assembly capability is unavailable. |
| MP2315DJ-LF-Z | Integrated 12V/3A buck converter (MOSFETs built-in); fixed 500kHz frequency; no IPRG or TRACK/SS pins | Suitable for lower-current, cost-sensitive designs where external MOSFET flexibility is not needed | Choose for simplified BOM and layout when 3A output suffices and programmability is secondary to integration. |
Compared with LTC3822EGN-1#PBF, the LTC3822EDD-1#PBF offers superior thermal performance (θJA = 43°C/W vs. 110°C/W) and smaller footprint, while MP2315DJ-LF-Z trades configurability for integration-making LTC3822EDD-1#PBF optimal for high-current, thermally constrained, or multi-rail Li-ion systems.
Availability
LTC3822EDD-1#PBF is available at Aetrix Electronics and suitable for Li-ion battery-powered portable devices, 3.3V point-of-load regulation, and industrial control modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3822EDD-1#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3822 product line was designed specifically for high-efficiency, low-input-voltage synchronous buck conversion in space-constrained, battery-operated systems - emphasizing no-RSENSE operation, wide duty cycle range, and flexible light-load management.
FAQ
What is the function of the IPRG pin on the LTC3822EDD-1#PBF?
The IPRG pin on the LTC3822EDD-1#PBF selects the maximum peak current sense voltage threshold across the top MOSFET: tying it to GND sets ΔVSENSE(MAX) = 82mV, floating sets 125mV, and tying to VIN sets 200mV. This allows precise matching of the controller's current limit to the RDS(ON) of selected external MOSFETs, ensuring accurate overcurrent protection without sense resistors. The LTC3822EDD-1#PBF uses this setting to scale its internal current comparator threshold accordingly.
Does the LTC3822EDD-1#PBF support external clock synchronization?
Yes, the LTC3822EDD-1#PBF supports external clock synchronization via its SYNC/MODE pin, accepting input frequencies from 250kHz to 750kHz to phase-lock its internal oscillator. When synchronized, the PLLLPF pin must be connected to ground through an RC network to serve as the loop filter. This capability enables noise-sensitive applications - such as RF subsystems or precision ADC supplies - to avoid beat frequencies and EMI peaks. The LTC3822EDD-1#PBF maintains stable regulation and current-mode control during synchronization.
How does the LTC3822EDD-1#PBF achieve high efficiency at light loads?
The LTC3822EDD-1#PBF achieves high light-load efficiency primarily through Burst Mode® operation, which disables switching and places the controller in a low-power sleep state (7.5µA quiescent current) until output voltage droop triggers resumption. It also supports pulse skipping and forced continuous modes via the SYNC/MODE pin, allowing engineers to balance efficiency against output ripple and audible noise. The LTC3822EDD-1#PBF's VDS sensing architecture eliminates sense-resistor losses entirely, further boosting sub-100mA efficiency.
What package type is used for the LTC3822EDD-1#PBF?
The LTC3822EDD-1#PBF uses a 12-pin thermally enhanced DFN package measuring 3mm × 3mm with an exposed ground pad (Pin 13) that must be soldered to the PCB for optimal thermal performance (θJA = 43°C/W). This package differs from the 16-pin SSOP variant (LTC3822EGN-1#PBF) by omitting the PGOOD pin and offering significantly better power dissipation - making it ideal for high-current, space-constrained applications. The LTC3822EDD-1#PBF's DD12 footprint is documented in Linear Technology's package drawing DD12.
Can the LTC3822EDD-1#PBF be used with input voltages below 2.75V?
No, the LTC3822EDD-1#PBF has a specified minimum input voltage of 2.75V per its Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this level risks failure to start, unstable regulation, or violation of the undervoltage lockout threshold (2.25V falling, 2.45V rising), which disables switching. While some margin exists due to characterization, Analog Devices does not guarantee functionality below 2.75V. For sub-2.75V operation, consider dedicated ultra-low-VIN controllers - the LTC3822EDD-1#PBF is optimized for 2.75–4.5V, especially single-cell Li-ion and 3.3V rails.
LTC3822EDD-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-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:
- 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#PBF FAQ
1.How can I place an order for LTC3822EDD-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3822EDD-1#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-1#PBF reliable?
The price and inventory of LTC3822EDD-1#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-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3822EDD-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3822EDD-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3822EDD-1#PBF?
LTC3822EDD-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3822EDD-1#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-1#PBF?
For technical support, including LTC3822EDD-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3822EDD-1#PBF requirements.
6.How does Aetrix verify that LTC3822EDD-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3822EDD-1#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-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3822EDD-1#PBF?
All LTC3822EDD-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3822EDD-1#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-1#PBF part is unused and in its original packaging.
Return procedure for LTC3822EDD-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3822EDD-1#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…
