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Analog Devices Inc. LTC3822EDD#TRPBF
- Part No.:
- LTC3822EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3822EDD#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,353
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Product details
Overview
LTC3822EDD#TRPBF 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 features 99% maximum duty cycle for low-dropout operation in Li-ion battery and 3.3V rail applications.
For engineers reviewing the LTC3822EDD#TRPBF datasheet, LTC3822EDD#TRPBF pinout, LTC3822EDD#TRPBF application, or LTC3822EDD#TRPBF equivalent, key selection considerations include VIN range (2.75–4.5V), ±1% 0.6V reference accuracy, selectable 300/550/750kHz frequency, ITH-controlled current limit, and DFN-10 package thermal performance.
Technical Context
The LTC3822EDD#TRPBF 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 an internal soft-start ramp (650μs), anti-shoot-through gate drive logic, and reverse-current detection to enable discontinuous conduction mode at light loads.
It integrates dual N-channel gate drivers (TG/BG) with 1A peak output, BOOST capacitor refresh timeout for dropout support, and overvoltage protection triggered at 13.33% above 0.6V reference (0.68V threshold). The RUN pin enables digital shutdown with 7.5μA quiescent current, while IPRG selects peak sense voltage thresholds (82/120/200mV) for duty-cycle-dependent slope compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.75V to 4.5V - supports single-cell Li-ion and 3.3V system rails without pre-regulation |
| Reference Voltage | 0.6V ±1% - enables precise output regulation with minimal feedback divider error |
| Max Duty Cycle | 99% - allows near-lossless operation during input voltage sag or high VOUT/VIN ratios |
| Switching Frequency | Selectable 300/550/750kHz - balances efficiency vs. inductor/capacitor size trade-offs |
| Peak Sense Threshold | 82/120/200mV (IPRG-selectable) - sets current limit via MOSFET RDS(ON) without sense resistor |
| Quiescent Current | 340μA normal / 7.5μA shutdown - minimizes battery drain in portable standby modes |
| Overvoltage Threshold | 0.68V at VFB - protects downstream circuitry from transient overshoot exceeding 13.33% of 0.6V |
Pinout & Package
The LTC3822EDD#TRPBF is housed in a thermally enhanced 3mm × 3mm 10-lead plastic DFN package with exposed GND pad (Pin 11) requiring soldering to PCB for electrical continuity and thermal dissipation (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BG (1) | Bottom gate driver output | Drives gate of synchronous N-MOSFET from GND to BOOST; enables zero-voltage switching |
| TG (2) | Top gate driver output | Drives gate of high-side N-MOSFET from GND to BOOST; supports bootstrap gate drive |
| BOOST (3) | Gate driver supply | Accepts bootstrapped capacitor (VIN-to-SW) or external 5V source; swings from VIN to 2×VIN |
| VIN (4) | Main supply & current sense + | Powers control circuitry and serves as positive input to differential current comparator |
| SW (5) | Switch node | Connects to inductor, top MOSFET source, bottom MOSFET drain; negative current sense input |
| FREQ (6) | Frequency select | GND = 300kHz, floating = 550kHz, VIN = 750kHz - sets oscillator without external components |
| IPRG (7) | Peak sense threshold select | VIN = 200mV, GND = 82mV, floating = 120mV - configures current limit for MOSFET RDS(ON) |
| VFB (8) | Feedback input | Compares output voltage divider to 0.6V reference; determines regulated VOUT |
| ITH (9) | Error amp compensation | Sets current comparator threshold (0.7–2.0V range); defines peak inductor current |
| RUN (10) | Enable/shutdown control | <1.1V = shutdown (7.5μA IQ), ≥1.1V = active - supports sequencing and power management |
Key Features
| Feature | Design Value |
|---|---|
| No external current sense resistor | Uses MOSFET VDS sensing to eliminate 1–3% power loss and PCB space typically consumed by RSENSE |
| All-N-channel synchronous drive | Enables higher efficiency than P-channel top switch; reduces BOM cost and improves thermal performance |
| Digital RUN pin with micropower shutdown | Reduces system standby current to 7.5μA while maintaining fast wake-up and controlled start-up |
| Output overvoltage protection | Disables top MOSFET and activates bottom MOSFET when VFB exceeds 0.68V - prevents damage to load ICs |
| Internal soft-start (650μs) | Linearly ramps VFB reference from 0.05V to 0.55V to limit inrush current and prevent output overshoot |
Applications
| Portable Medical Sensors | Industrial IoT Edge Nodes |
|---|---|
Use Scenario: Battery-powered wearable ECG monitor operating from single-cell Li-ion (2.7–4.2V) with 1.8V FPGA core supply. IC Role / Device Role / Timing Role: Synchronous step-down controller regulating stable 1.8V/3A rail with minimal heat generation and no sense resistor losses. Use Value: Extends battery life by >8% versus resistor-based controllers and eliminates thermal hotspots in compact enclosures. | Use Scenario: Wireless sensor node with ultra-low-power MCU, RF transceiver, and analog front-end powered from 3.3V system rail. IC Role / Device Role / Timing Role: High-efficiency buck controller delivering 1.2V/2A to MCU core while supporting dynamic voltage scaling. Use Value: Achieves >92% efficiency at 1A load, enabling 10-year battery life in sealed industrial deployments. |
| Automotive Infotainment Displays | High-Density Server PMBus Modules |
Use Scenario: LCD backlight driver board requiring clean 1.8V supply from vehicle's 3.3V domain under cold-crank (2.75V min) conditions. IC Role / Device Role / Timing Role: Low-dropout controller maintaining regulation down to 2.75V input with 99% duty cycle and tight line/load regulation. Use Value: Prevents display flicker or reset during engine cranking by sustaining output during brownout events. | Use Scenario: Distributed power architecture where multiple point-of-load converters are managed via PMBus from central controller. IC Role / Device Role / Timing Role: Standalone controller used in modular POL design with external MOSFETs selected for optimal RDS(ON)/QG trade-off. Use Value: Enables flexible current rating (up to 15A with discrete FETs) and thermal optimization per module without redesigning controller IC. |
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 |
|---|---|---|---|
| LTC3850EMSE#TRPBF | Wider VIN range (4.5–38V), integrated 5V bias regulator, no IPRG pin - requires external sense resistor | Designed for higher-input industrial/automotive systems; lacks no-RSENSE capability | Choose when input exceeds 4.5V or bias supply needed; avoid if minimizing sense loss is critical |
| MP2315DJ-LF-Z | Integrated MOSFETs, fixed 500kHz, 3.3–18V input, 0.8V reference - no IPRG/FREQ pins or BOOST refresh | Compact monolithic solution for medium-current apps; not suitable for high-current or ultra-low-VIN designs | Prefer for space-constrained 2–5A designs where external FET flexibility is unnecessary |
Compared with LTC3850EMSE#TRPBF and MP2315DJ-LF-Z, the LTC3822EDD#TRPBF uniquely combines no-RSENSE operation, sub-3V startup, and 99% duty cycle in a thermally optimized DFN - making it irreplaceable for high-efficiency, low-input-voltage, high-current POL applications.
Availability
LTC3822EDD#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial IoT edge nodes, automotive infotainment displays, and high-density server PMBus modules requiring stable component supply across extended temperature ranges.
Supply support for LTC3822EDD#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 and maintains its high-performance power management portfolio with rigorous reliability testing and long-term product support.
The LTC3822EDD#TRPBF belongs to Linear's No RSENSE™ synchronous controller family, designed specifically for high-efficiency, low-input-voltage DC/DC conversion in battery-powered and compact embedded systems.
FAQ
What is the minimum input voltage required for the LTC3822EDD#TRPBF to start switching?
The LTC3822EDD#TRPBF has an undervoltage lockout (UVLO) threshold of 2.25V (typical) on VIN rising. It will not initiate switching until VIN exceeds this level, ensuring stable operation before enabling gate drivers. Below 2.25V, all internal circuits remain disabled except the UVLO block, which draws only microamperes. This behavior is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet.
Can the LTC3822EDD#TRPBF operate with a 2.5V input supply?
Yes, the LTC3822EDD#TRPBF supports continuous operation down to 2.75V per its specified input range, and functional operation below that (down to ~2.4V) is documented in Figure 4 of the datasheet. At 2.5V input, output current capability is reduced due to lower gate drive margin and decreased peak sense voltage headroom - actual deliverable current must be verified against the IPRG-selected ΔVSENSE(MAX) and MOSFET RDS(ON) at junction temperature.
How does the IPRG pin affect current limiting on the LTC3822EDD#TRPBF?
The IPRG pin on the LTC3822EDD#TRPBF selects the maximum allowable peak sense voltage (ΔVSENSE(MAX)) between VIN and SW: 82mV (IPRG = GND), 120mV (IPRG = floating), or 200mV (IPRG = VIN). This directly sets the current limit via IPK = ΔVSENSE(MAX)/RDS(ON), enabling precise current limiting without a sense resistor. Slope compensation modifies this threshold above 20% duty cycle per Figure 1 in the datasheet.
Is the LTC3822EDD#TRPBF pin-compatible with the LTC3822EMSE#TRPBF?
Yes, the LTC3822EDD#TRPBF (DFN-10) and LTC3822EMSE#TRPBF (MSOP-10) share identical pin functions and ordering - both have 10-pin layouts with matching pin numbering and signal assignments (RUN, ITH, VFB, etc.). However, thermal performance differs: θJA is 43°C/W for DFN vs. 40°C/W for MSOP, and the exposed pad on the DFN must be soldered to GND for optimal thermal and electrical performance.
Does the LTC3822EDD#TRPBF provide short-circuit protection?
Yes, the LTC3822EDD#TRPBF implements short-circuit protection by monitoring the VFB pin. When VFB drops near ground (indicating output short), the controller reduces switching frequency to limit inductor current runaway. Frequency progressively returns to normal as VFB recovers. This feature is disabled during startup to avoid false triggering but activates immediately after soft-start completes.
LTC3822EDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-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:
- 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#TRPBF FAQ
1.How can I place an order for LTC3822EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3822EDD#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#TRPBF reliable?
The price and inventory of LTC3822EDD#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3822EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3822EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3822EDD#TRPBF?
LTC3822EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3822EDD#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#TRPBF?
For technical support, including LTC3822EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3822EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3822EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3822EDD#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3822EDD#TRPBF?
All LTC3822EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3822EDD#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3822EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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