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Analog Devices Inc. LTC3822EMSE#TRPBF
- Part No.:
- LTC3822EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3822EMSE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,524
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Product details
Overview
LTC3822EMSE#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, operating from 2.75V to 4.5V input and delivering up to 8A output at 1.8V with 550kHz switching frequency in a 10-lead MSOP package. It features constant-frequency current-mode control, 99% maximum duty cycle for low-dropout operation, and digital RUN pin enable/disable.
For engineers reviewing the LTC3822EMSE#TRPBF datasheet, LTC3822EMSE#TRPBF pinout, LTC3822EMSE#TRPBF application, or LTC3822EMSE#TRPBF equivalent, key selection considerations include its No RSENSE™ architecture, selectable 300/550/750kHz frequency, ±1% 0.6V reference accuracy, ITH-based current threshold programming, and dual-gate drive capability for high-efficiency Li-ion and 3.3V system power conversion.
Technical Context
The LTC3822EMSE#TRPBF implements a constant-frequency current-mode control loop using VDS sensing across the top MOSFET to eliminate sense resistors. Its error amplifier compares VFB against a precision 0.6V internal reference, modulating the ITH voltage to regulate peak inductor current. The controller supports three fixed oscillator frequencies selected via the FREQ pin (GND = 300kHz, float = 550kHz, VIN = 750kHz), and uses slope compensation above 20% duty cycle to maintain stability.
It integrates anti-shoot-through logic between TG and BG outputs, delivers 1A peak gate drive, and includes output overvoltage protection triggered at 0.68V on VFB (13.33% above 0.6V). Shutdown draws only 7.5μA, and internal soft-start ramps VFB from 0.05V to 0.55V in 650μs to limit inrush current during startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.75V to 4.5V - supports single-cell Li-ion and 3.3V rail inputs without external LDO pre-regulation |
| Reference Voltage | 0.6V ±1% - enables accurate output regulation down to 0.6V with external resistor divider |
| Max Duty Cycle | 99% - allows near-lossless dropout operation when VIN ≈ VOUT, critical for battery end-of-life support |
| Switching Frequency | Selectable 300/550/750kHz - balances efficiency (lower f) vs. size (higher f); 550kHz default enables compact 0.47μH inductors |
| Peak Sense Threshold | 70–220mV (via IPRG pin) - sets current limit by MOSFET RDS(ON), enabling precise IOUT scaling without sense resistor loss |
| Quiescent Current | 340μA normal / 7.5μA shutdown - minimizes standby power in portable systems |
| Gate Drive Outputs | TG & BG: 1A peak, 40–50ns rise/fall - drives low-VGS(th) sublogic-level N-MOSFETs efficiently at high frequency |
Pinout & Package
The LTC3822EMSE#TRPBF is housed in a thermally enhanced 10-lead MSOP package (3mm × 3mm footprint, exposed pad GND) with θJA = 40°C/W. The exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| 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) | Bootstrap Supply Input | Provides gate drive voltage for TG; connected to CB–SW node - enables full N-MOSFET utilization without P-MOS or charge pump |
| VIN (Pin 4) | Main Power Input | Powers control circuitry and serves as + input to current comparator - must not be locally decoupled to preserve current-sense path integrity |
| SW (Pin 5) | Switch Node | Connects to source of top MOSFET, drain of bottom MOSFET, and inductor - forms differential current sense node (VIN–SW) for No RSENSE™ operation |
| FREQ (Pin 6) | Frequency Select Input | Logic-level input: GND = 300kHz, float = 550kHz, VIN = 750kHz - enables layout-optimized frequency choice without external components |
| IPRG (Pin 7) | Current Limit Threshold Select | Configures ΔVSENSE(MAX): GND = 82mV, float = 120mV, VIN = 200mV - directly scales current limit based on MOSFET RDS(ON) |
| VFB (Pin 8) | Feedback Input | Monitors output voltage via resistor divider; referenced to 0.6V - enables precise regulation and OVP detection at 0.68V |
| ITH (Pin 9) | Error Amp Compensation / Current Threshold | Setpoint for current comparator; nominal range 0.7V–2.0V - determines peak inductor current and provides loop compensation node |
| RUN (Pin 10) | Enable Control Input | Shuts down chip when <1.1V; enables with internal soft-start when ≥1.1V - provides clean power sequencing and system-level ON/OFF control |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE™ current sensing | Eliminates 5–15mΩ sense resistor and associated 0.5–2W I²R loss at 8A, improving full-load efficiency by 2–4% |
| All-N-channel MOSFET support | Enables use of lower RDS(ON) and higher-performance N-MOSFETs on both sides, reducing conduction loss vs. P-MOS high-side solutions |
| Digital RUN pin with soft-start | Provides controlled 650μs VFB ramp-up, limiting inrush current and preventing output overshoot during power-on |
| Output overvoltage protection | Disables top MOSFET and activates bottom MOSFET if VFB exceeds 0.68V, protecting downstream 1.8V logic from transient damage |
| Selectable peak current threshold | Three IPRG states allow matching current limit to specific MOSFET RDS(ON) values (e.g., 82mV for 1.5mΩ, 200mV for 3.5mΩ), optimizing load-current capability |
Applications
| Mobile Phone Baseband Power | Li-ion Powered Industrial Sensor Node |
|---|---|
Use Scenario: Regulating 1.8V core supply for ARM Cortex-M4 microcontroller and RF transceiver in battery-powered smartphone subsystem. IC Role / Device Role / Timing Role: Synchronous step-down controller managing high-efficiency conversion from 3.3V Li-ion (3.0–4.2V range) to stable 1.8V rail with fast load transient response. Use Value: No RSENSE™ architecture preserves >92% efficiency at 8A peak load while eliminating heat-generating sense resistor, extending battery runtime and simplifying thermal design. | Use Scenario: Providing 2.5V analog front-end supply for precision ADC and op-amp in remote wireless sensor node powered by single Li-ion cell. IC Role / Device Role / Timing Role: Low-quiescent-current DC/DC controller maintaining tight 2.5V regulation across wide input range (2.75–4.5V) with micropower shutdown mode. Use Value: 7.5μA shutdown current extends shelf life and operational lifetime; ±1% reference ensures <±25mV output drift over temperature for measurement accuracy. |
| 3.3V System Rail Converter | Low-Voltage FPGA Core Supply |
Use Scenario: Generating 1.2V core voltage for Xilinx Spartan-7 FPGA from 3.3V intermediate bus in compact industrial PLC module. IC Role / Device Role / Timing Role: High-current synchronous buck controller supporting 6A continuous load with programmable 550kHz switching for small 0.47μH inductor footprint. Use Value: 99% duty cycle maintains regulation down to 1.25V input, ensuring reliable operation during brownout conditions on the 3.3V bus. | Use Scenario: Delivering 1.0V/5A core supply to Intel MAX 10 FPGA in space-constrained test equipment, requiring minimal board area and low EMI. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller with selectable 750kHz operation to minimize inductor and capacitor size while maintaining stability. Use Value: 750kHz frequency enables use of 0.22μH shielded inductor and 100μF ceramic output cap, reducing solution volume by 40% vs. 300kHz design. |
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 | Higher VIN range (4.5–38V), integrated 5V bias regulator, no IPRG pin - requires external sense resistor | Suitable for wide-input industrial supplies; lacks No RSENSE™ benefit for low-VIN apps | Choose only if input exceeds 4.5V or bias rail generation is needed; not drop-in for LTC3822EMSE#TRPBF |
| TPS54332DR | Integrated MOSFETs (3A), fixed 600kHz, no IPRG or BOOST pin - lower current, no external FET flexibility | Targeted at cost-sensitive, medium-current designs where board space > efficiency is priority | Use when ≤3A output suffices and integration outweighs efficiency/thermal trade-offs; not pin-compatible |
Compared with LTC3850EMSE#TRPBF and TPS54332DR, the LTC3822EMSE#TRPBF uniquely combines ultra-low input operation (2.75V), No RSENSE™ architecture, and external MOSFET flexibility - making it optimal for high-efficiency, high-current, low-voltage battery systems where thermal and efficiency margins are critical.
Availability
LTC3822EMSE#TRPBF is available at Aetrix Electronics and suitable for mobile phone baseband power, Li-ion powered industrial sensor nodes, and 3.3V system rail conversion requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production lots.
Supply support for LTC3822EMSE#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, 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 LTC3822EMSE#TRPBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC controllers, designed specifically for demanding low-input-voltage, high-current power conversion in portable and battery-operated systems.
FAQ
What is the minimum input voltage required for the LTC3822EMSE#TRPBF to operate?
The LTC3822EMSE#TRPBF has an absolute minimum input voltage of 2.75V per its specified operating range. Below this, undervoltage lockout (UVLO) disables the controller - the rising UVLO threshold is 2.15V to 2.45V, and the falling threshold is 1.95V to 2.25V. Operation below 2.75V is not guaranteed, and output current capability degrades significantly below 3.0V as shown in Figure 4 of the datasheet. The LTC3822EMSE#TRPBF is optimized for 3.3V and single-cell Li-ion (3.0–4.2V) applications.
Does the LTC3822EMSE#TRPBF require an external current-sense resistor?
No, the LTC3822EMSE#TRPBF does not require an external current-sense resistor. It implements No RSENSE™ technology by measuring the voltage drop (VDS) across the external top-side N-channel MOSFET between the VIN and SW pins. This eliminates I²R losses and board space associated with traditional sense resistors. The peak sense voltage threshold is programmable via the IPRG pin (70–220mV), and slope compensation is applied above 20% duty cycle to maintain stability in the LTC3822EMSE#TRPBF.
What package type and thermal characteristics does the LTC3822EMSE#TRPBF use?
The LTC3822EMSE#TRPBF is supplied in a 10-lead plastic MSOP package (MSE) with an exposed pad that must be soldered to PCB ground. It has a junction-to-ambient thermal resistance (θJA) of 40°C/W. The exposed pad is electrically GND and critical for both thermal dissipation and noise immunity. Proper PCB layout - including ≥4 thermal vias under the pad connected to a solid ground plane - is required to achieve rated performance and reliability in the LTC3822EMSE#TRPBF.
How is the switching frequency selected on the LTC3822EMSE#TRPBF?
The switching frequency of the LTC3822EMSE#TRPBF is selected using the FREQ pin (Pin 6): tying it to GND sets 300kHz, leaving it floating selects 550kHz (default), and connecting it to VIN configures 750kHz. These are fixed frequencies - no external resistor or capacitor is needed. The choice trades off efficiency (lower f reduces MOSFET switching loss) versus component size (higher f allows smaller inductors/capacitors). All three frequencies are guaranteed over temperature and line, and the LTC3822EMSE#TRPBF maintains constant-frequency current-mode operation in each mode.
Can the LTC3822EMSE#TRPBF be used with P-channel high-side MOSFETs?
No, the LTC3822EMSE#TRPBF is designed exclusively for all-N-channel MOSFET configurations. Its TG driver is a bootstrapped high-side driver requiring a floating source (SW node) and cannot drive P-MOSFETs, which need gate voltage below source. The controller's current-sense architecture (VIN–SW) and gate drive timing (anti-shoot-through logic) assume N-MOSFETs on both top and bottom positions. Using P-MOS on the high side would break the No RSENSE™ sensing path and disable proper gate drive - the LTC3822EMSE#TRPBF requires two matched N-channel power MOSFETs.
LTC3822EMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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-MSOP-EP
LTC3822EMSE#TRPBF FAQ
1.How can I place an order for LTC3822EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3822EMSE#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 LTC3822EMSE#TRPBF reliable?
The price and inventory of LTC3822EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3822EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3822EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3822EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3822EMSE#TRPBF?
LTC3822EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3822EMSE#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 LTC3822EMSE#TRPBF?
For technical support, including LTC3822EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3822EMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3822EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3822EMSE#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 LTC3822EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3822EMSE#TRPBF?
All LTC3822EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3822EMSE#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 LTC3822EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3822EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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