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Analog Devices Inc. LTC3822EGN-1#TRPBF
- Part No.:
- LTC3822EGN-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3822EGN-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,175
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Product details
Overview
LTC3822EGN-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% 0.6V reference accuracy, and supports 99% duty cycle for low-dropout operation in Li-ion-powered systems.
For engineers reviewing the LTC3822EGN-1#TRPBF datasheet, LTC3822EGN-1#TRPBF pinout, LTC3822EGN-1#TRPBF application, or LTC3822EGN-1#TRPBF equivalent, key selection criteria include its no-RSENSE architecture, programmable 250–750kHz switching frequency, Burst Mode® efficiency optimization, digital RUN control, and integrated overvoltage protection - all in a thermally enhanced 16-pin narrow SSOP package.
Technical Context
The LTC3822EGN-1#TRPBF implements a constant-frequency current-mode control architecture with MOSFET VDS sensing, eliminating external sense resistors while maintaining precise peak-current limiting via the ITH pin and IPRG-selectable ΔVSENSE(MAX) thresholds (82mV/125mV/200mV). Its phase-lockable oscillator supports synchronization from 250kHz to 750kHz, and internal soft-start provides controlled 1ms ramp-up of VFB from 0.05V to 0.55V.
It features dual N-channel gate drivers (TG/BG) with 40–50ns rise/fall times into 3000pF, output overvoltage protection triggered at 0.68V on VFB (±13.3% window), and micropower shutdown drawing only 7.5µA. The GN package includes a dedicated PGOOD open-drain output, while the DFN variant omits it - confirming LTC3822EGN-1#TRPBF's identity as the 16-pin SSOP version with PGOOD functionality.
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 | 0.6V ±1% - enables accurate output regulation down to 0.6V with tracking capability. |
| Max Duty Cycle | 99% - ensures minimal dropout voltage, extending battery runtime in portable applications. |
| Switching Frequency | 250kHz to 750kHz - programmable via PLLLPF pin or synchronizable externally for EMI control. |
| Light-Load Mode | Selectable Burst Mode®/pulse skipping/forced continuous - balances efficiency vs. ripple/noise trade-offs. |
| Shutdown Current | 7.5µA - ultra-low quiescent draw preserves battery life during system sleep states. |
| Overvoltage Threshold | VFB = 0.68V (13.3% above 0.6V) - fast-acting protection against transient overshoots. |
| Package | 16-pin narrow SSOP (GN) - includes PGOOD pin and GND pins at Pins 1 & 9 for noise immunity. |
Pinout & Package
Package: 16-pin narrow SSOP (GN), thermally enhanced with exposed thermal pad not present (unlike DFN); Pin 13 is GND, Pin 4 is PGOOD - distinguishing LTC3822EGN-1#TRPBF from the 12-pin DFN variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 9) | Power and signal ground reference | Dual GND pins reduce ground impedance and improve noise rejection in high-current switching paths. |
| PLLLPF (Pin 2) | Oscillator frequency select & PLL compensation | Setting determines base frequency (300/550/750kHz); when synchronized, hosts RC loop filter for stable lock. |
| SYNC/MODE (Pin 3) | External clock input / light-load mode selector | DC voltage selects Burst Mode® (VIN), forced continuous (GND), or pulse skipping (0.4–1.2V); AC input enables PLL sync. |
| TRACK/SS (Pin 5) | Tracking reference or external soft-start input | Enables output voltage to track another rail; capacitor here sets custom soft-start time beyond internal 1ms. |
| VFB (Pin 6) | Feedback input for output regulation | Compares divider output to 0.6V reference; also monitored by OVP and PGOOD comparators. |
| ITH (Pin 7) | Error amplifier output & current threshold control | Voltage sets peak inductor current limit; clamped to ~1.98V max, enabling precise current control. |
| RUN (Pin 8) | Enable/disable control input | Logic-high (≥1.1V) enables operation; <0.7V forces shutdown with 7.5µA IQ - supports system-level power sequencing. |
| IPRG (Pin 10) | Peak sense voltage threshold select | Three-state pin (GND/VIN/floating) configures ΔVSENSE(MAX) to 82mV/200mV/125mV for MOSFET RDS(ON) optimization. |
| BG (Pin 11) | Bottom gate driver output | Drives synchronous rectifier MOSFET gate from GND to BOOST; prevents shoot-through with built-in dead-time. |
| TG (Pin 12) | Top gate driver output | Drives high-side N-MOSFET gate from GND to BOOST; supports bootstrap operation with external diode/capacitor. |
| BOOST (Pin 13) | Bootstrap supply for top gate driver | Connected to SW via external Schottky + capacitor; supplies >VIN gate drive for efficient high-side switching. |
| PGOOD (Pin 4) | Open-drain power-good status output | Pulled low when VFB deviates >±13.3% from 0.6V or during UVLO/shutdown - enables system fault monitoring. |
| SENSE– (Pin 15) | Negative current sense input | Used only in GN package for differential VDS sensing; connects to source of top MOSFET for accurate current detection. |
| VIN (Pin 14) | Main input supply and current comparator positive input | Powers control circuitry and serves as reference for VDS sensing - requires local ceramic bypassing. |
| SW (Pin 16) | Switch node connection | Connects to inductor, top MOSFET source, and bottom MOSFET drain; also negative input to current comparator. |
Key Features
| Feature | Design Value |
|---|---|
| No current-sense resistor required | VDS sensing across top MOSFET eliminates power loss and board space of RSENSE, improving efficiency by ~0.5–1.2% at full load. |
| Selectable light-load operating mode | Burst Mode®, pulse skipping, or forced continuous - lets designers optimize for efficiency (Burst), low ripple (continuous), or EMI (pulse skip). |
| Digital RUN pin with micropower shutdown | 7.5µA shutdown IQ enables long battery standby; RUN pin supports clean enable/disable sequencing with hysteresis. |
| Output overvoltage protection (OVP) | Hardware-based OVP triggers at VFB = 0.68V, turning off TG and activating BG to clamp output - protects downstream loads unconditionally. |
| Tracking and adjustable soft-start | TRACK/SS pin allows coordinated startup with other rails or custom ramp rates via external capacitor - prevents inrush and sequencing faults. |
| Phase-lockable oscillator (250–750kHz) | Eliminates beat frequencies in multi-rail systems; PLL lock range extends to 1MHz, supporting tight EMI compliance requirements. |
Applications
| Li-Ion Battery-Powered Systems | 3.3V Input Distributed Power Rails |
|---|---|
|
Use Scenario: Portable medical devices (e.g., handheld ultrasound, infusion pumps) powered by single-cell Li-ion batteries (2.7–4.2V). IC Role / Device Role / Timing Role: Primary step-down controller regulating 1.8V/3.3V system rails from varying battery voltage, using 99% duty cycle to maximize runtime near end-of-discharge. Use Value: No-RSENSE architecture preserves battery energy; Burst Mode® sustains >85% efficiency at 10mA load, extending operational time between charges. |
Use Scenario: Industrial IoT edge nodes with 3.3V backplane powering FPGA I/O banks, ADCs, and RF transceivers. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator delivering up to 8A with tight transient response, synchronized to system clock to suppress conducted EMI. Use Value: Phase-locked operation eliminates heterodyne noise; ±1% reference and load regulation ensure signal integrity in precision analog subsystems. |
| FPGA Core Voltage Supply | Automotive Infotainment SoC Rails |
|
Use Scenario: Mid-range FPGA (e.g., Xilinx Artix-7) requiring 1.0V core supply with fast load-step response and low noise. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller providing excellent line/load transient response (<5µs recovery) via ITH-based current limiting. Use Value: Adjustable soft-start prevents FPGA configuration faults; PGOOD confirms stable 1.0V before releasing reset - ensuring reliable boot. |
Use Scenario: Automotive head-unit SoC (e.g., Qualcomm SA8155) needing 1.8V I/O rail compliant with AEC-Q100 Grade 3 (–40°C to 105°C). IC Role / Device Role / Timing Role: Synchronous buck controller operating across full automotive temperature range, leveraging internal thermal shutdown and robust UVLO (2.25V). Use Value: 16-pin SSOP package offers proven reliability in reflow profiles; no external sense resistor reduces BOM risk and improves long-term stability. |
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 |
|---|---|---|---|
| LTC3822EDD-1#TRPBF | 12-pin 3mm × 3mm DFN package; lacks PGOOD pin and SENSE– input; higher θJA (43°C/W vs. 110°C/W). | Suitable for space-constrained PCBs where PGOOD monitoring is unnecessary and thermal budget permits smaller footprint. | Choose LTC3822EDD-1#TRPBF only if board area is critical and system-level power sequencing does not require PGOOD feedback. |
| MP2315DJ-LF-Z | Integrated 2A MOSFETs (no external FETs); fixed 500kHz frequency; no PLL sync, no TRACK/SS, no IPRG select. | Targeted at lower-current, cost-sensitive applications where integration outweighs flexibility - e.g., consumer wearables. | Choose MP2315DJ-LF-Z only for ≤2A loads where external MOSFET optimization, frequency tuning, and rail tracking are not required. |
Compared with LTC3822EGN-1#TRPBF, the LTC3822EDD-1#TRPBF trades PGOOD and thermal performance for compactness, while the MP2315DJ-LF-Z sacrifices configurability and current capability for monolithic simplicity - making LTC3822EGN-1#TRPBF optimal for high-flexibility, medium-power industrial and portable designs requiring robust monitoring and thermal management.
Availability
LTC3822EGN-1#TRPBF is available at Aetrix Electronics and suitable for Li-ion battery systems, 3.3V distributed power rails, and FPGA core voltage regulation requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3822EGN-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 and maintains its legacy of high-performance power management ICs with rigorous testing and automotive-grade qualification pathways.
The LTC3822 family was designed specifically for high-efficiency, low-input-voltage synchronous buck conversion in portable and battery-critical applications - emphasizing no-RSENSE operation, wide duty-cycle range, and robust protection features.
FAQ
What is the function of the IPRG pin on the LTC3822EGN-1#TRPBF?
The IPRG pin on the LTC3822EGN-1#TRPBF selects the maximum peak current sense voltage threshold (ΔVSENSE(MAX)) across the top MOSFET: tying to GND sets 82mV, floating sets 125mV, and tying to VIN sets 200mV. This allows designers to optimize RDS(ON) selection for different load currents and thermal constraints while maintaining accurate current limiting in the LTC3822EGN-1#TRPBF.
Does the LTC3822EGN-1#TRPBF support external synchronization, and what is its valid frequency range?
Yes, the LTC3822EGN-1#TRPBF supports external synchronization via the SYNC/MODE pin, with a valid locking range of 250kHz to 750kHz. When an external clock is applied, the internal oscillator phase-locks to it, suppressing switching frequency jitter and enabling EMI reduction in noise-sensitive systems - a confirmed capability documented in the LTC3822EGN-1#TRPBF datasheet Figure 10 and Electrical Characteristics table.
How does the PGOOD pin on the LTC3822EGN-1#TRPBF operate, and what conditions trigger it?
The PGOOD pin on the LTC3822EGN-1#TRPBF is an open-drain output pulled low when the feedback voltage (VFB) deviates more than ±13.3% from the 0.6V reference - indicating output overvoltage, undervoltage, or startup incomplete. It remains low during RUN pin shutdown or VIN UVLO, providing unambiguous system-level power health monitoring for the LTC3822EGN-1#TRPBF.
Can the LTC3822EGN-1#TRPBF be used without an external soft-start capacitor?
Yes, the LTC3822EGN-1#TRPBF includes internal soft-start: connecting TRACK/SS to VIN activates a fixed ~1ms ramp where VFB is regulated to an internal linear ramp instead of 0.6V. This ensures controlled output rise without external components - a verified feature described in the LTC3822EGN-1#TRPBF Applications Information section and confirmed in Typical Performance Characteristic Figure G15.
What protection features are integrated into the LTC3822EGN-1#TRPBF?
The LTC3822EGN-1#TRPBF integrates output overvoltage protection (OVP), undervoltage lockout (UVLO), short-circuit foldback, reverse-current prevention, and thermal shutdown. OVP triggers at VFB = 0.68V to disable TG and activate BG; UVLO disables all functions below 2.25V VIN; and reverse-current detection uses the SENSE– pin to turn off BG before inductor current reverses - all explicitly specified in the LTC3822EGN-1#TRPBF datasheet.
LTC3822EGN-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- 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:
- 16-SSOP
LTC3822EGN-1#TRPBF FAQ
1.How can I place an order for LTC3822EGN-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3822EGN-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 LTC3822EGN-1#TRPBF reliable?
The price and inventory of LTC3822EGN-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 LTC3822EGN-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3822EGN-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3822EGN-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3822EGN-1#TRPBF?
LTC3822EGN-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3822EGN-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 LTC3822EGN-1#TRPBF?
For technical support, including LTC3822EGN-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3822EGN-1#TRPBF requirements.
6.How does Aetrix verify that LTC3822EGN-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3822EGN-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 LTC3822EGN-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3822EGN-1#TRPBF?
All LTC3822EGN-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3822EGN-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 LTC3822EGN-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3822EGN-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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