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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Analog Devices Inc. LTC3822EGN-1#PBF

Name: LTC3822EGN-1#PBF
Brand: Analog Devices Inc.
SKU: LTC3822EGN-1#PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC3822EGN-1#PBF

Manufacturer:: Analog Devices Inc.

Category:: DC DC Switching Controllers

Package:: 16-SSOP (0.154", 3.90mm Width)

Datasheet:: LTC3822EGN-1#PBF.pdf

Description:: IC REG CTRLR BUCK 16SSOP

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Product details

Overview

LTC3822EGN-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, operating from 2.75V to 4.5V input, delivering up to 8A output at 1.8V with ±1% 0.6V reference and 99% maximum duty cycle for low-dropout battery operation.

For engineers reviewing the LTC3822EGN-1#PBF datasheet, LTC3822EGN-1#PBF pinout, LTC3822EGN-1#PBF application, or LTC3822EGN-1#PBF equivalent, key selection considerations include VDS-based current sensing, selectable light-load modes (Burst/Continuous/Pulse Skip), IPRG-configurable peak sense threshold (82–200mV), PLL synchronization range (250–750kHz), and GN16-package-specific PGOOD monitoring.

Technical Context

The LTC3822EGN-1#PBF implements constant-frequency current-mode control using MOSFET V_DS sensing instead of a shunt resistor, enabling high efficiency and eliminating sense-resistor power loss. Its architecture includes an internal error amplifier driving the ITH pin to regulate peak inductor current, with slope compensation active above 20% duty cycle to ensure stability.

It supports three distinct light-load operating modes selected via SYNC/MODE pin voltage: Burst Mode (high-efficiency discontinuous conduction), forced continuous mode (no reverse current, lower ripple), and pulse-skipping mode (discontinuous, reduced audio noise). The GN16 package adds open-drain PGOOD with ±10% window detection on VFB and SENSE– pin for differential current sensing.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.75V to 4.5V - supports single-cell Li-ion and 3.3V rail systems without level shifting
Feedback Reference Voltage	0.6V ±1% - enables precise output regulation down to sub-1V with external divider
Max Duty Cycle	99% - sustains regulation when VIN approaches VOUT, critical for battery dropout extension
Switching Frequency	250kHz to 750kHz - programmable via PLLLPF or synchronizable externally for EMI control
Quiescent Current	7.5µA in shutdown - minimizes battery drain during system sleep states
Peak Sense Threshold	82mV / 125mV / 200mV - selectable via IPRG pin to match MOSFET R_DS(ON) and optimize current limit accuracy
PGOOD Accuracy	±10% window around 0.6V - provides reliable power-good assertion only in valid regulation band

Pinout & Package

The LTC3822EGN-1#PBF is packaged in a 16-pin narrow SSOP (GN16) with exposed pad grounded for thermal performance (θ_JA = 110°C/W). Pin 4 is PGOOD; Pin 15 is SENSE– for differential current sensing; GND pins are at Pins 1 and 9.

Pin/Terminal	Circuit Role	Design Meaning
GND (Pins 1, 9)	Power and signal ground reference	Low-impedance return path for gate drivers, error amp, and current comparators; must be connected to PCB ground plane
PLLLPF (Pin 2)	Oscillator frequency select & PLL loop filter node	Configures base frequency (300/550/750kHz) or accepts RC network for PLL lock when SYNC/MODE is clocked
SYNC/MODE (Pin 3)	External clock input / light-load mode selector	Accepts 250–750kHz sync clock; DC voltage selects Burst (VIN), Continuous (GND), or Pulse Skip (0.4–1.2V)
TRACK/SS (Pin 5)	Tracking voltage input / external soft-start node	Enables output voltage tracking of external rail; internal 1µA current source allows programmable soft-start time with capacitor
VFB (Pin 6)	Feedback input to error amplifier	Compares divided output voltage against 0.6V reference; regulates output by adjusting ITH voltage
ITH (Pin 7)	Error amplifier output / current threshold control	Sets peak inductor current limit; nominal 0.7–2.0V range determines comparator trip point
RUN (Pin 8)	Enable/disable control input	Logic-high (>1.1V) enables operation; <0.7V forces 7.5µA shutdown with TG/BG held low
IPRG (Pin 10)	Peak sense voltage select	Three-state input (GND/VIN/floating) sets ΔV_SENSE(MAX) to 82/200/125mV for MOSFET R_DS(ON) optimization
SW (Pin 16)	Switch node connection	Connects to source of top MOSFET and drain of bottom MOSFET; serves as negative current sense input (with SENSE–)
PGOOD (Pin 4)	Open-drain power-good indicator	Pulled low when VFB deviates >±10% from 0.6V; inactive during shutdown or UVLO
SENSE– (Pin 15)	Negative input to differential current comparator	Used with SW pin to measure V_DS across top MOSFET; enables true differential sensing in GN package

Key Features

Feature	Design Value
No R_SENSE required	Eliminates 5–15% power loss from sense resistors and associated board area; uses MOSFET V_DS as current sensor
Selectable light-load modes	Burst Mode achieves >85% efficiency at 10mA load; Pulse Skip reduces audible noise vs Burst; Continuous ensures lowest ripple
Dual N-MOSFET synchronous drive	Integrated TG and BG drivers support efficient 100% synchronous rectification without external driver ICs
Internal soft-start + tracking	1ms internal ramp or external capacitor-programmable start-up prevents inrush; TRACK/SS enables coordinated multi-rail sequencing
Output overvoltage protection	Hardware OVP disables top MOSFET and activates bottom MOSFET if VFB exceeds 0.68V, protecting downstream loads

Applications

Point-of-Load Regulation for FPGA Core	Li-Ion Powered Portable Instrumentation
Use Scenario: Regulating 1.8V/8A core supply for Xilinx Artix-7 FPGA with tight transient response requirements and thermal constraints. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing gate timing, current limiting, and soft-start sequencing for dual N-MOSFET power stage. Use Value: 99% duty cycle maintains regulation during brownout; ±1% reference ensures FPGA VCCINT tolerance compliance; PGOOD enables safe configuration loading.	Use Scenario: Powering handheld medical analyzer with single-cell Li-ion (2.8–4.2V) and 1.8V analog front-end requiring ultra-low quiescent current. IC Role / Device Role / Timing Role: Main system regulator implementing Burst Mode to extend battery life while maintaining fast wake-up capability. Use Value: 7.5µA shutdown current minimizes standby drain; V_DS sensing avoids sense-resistor self-heating in sealed enclosure; 2.75V UVLO prevents deep discharge.
3.3V-to-1.8V Industrial I/O Module	Multi-Rail Sequencing in Test Equipment
Use Scenario: Converting 3.3V backplane supply to 1.8V for high-speed digital I/O buffers in PLC module with EMI-sensitive environment. IC Role / Device Role / Timing Role: EMI-optimized controller synchronized to system clock via SYNC/MODE to avoid beat frequencies. Use Value: External clock sync (250–750kHz) eliminates switching noise peaks; no sense resistor removes parasitic inductance path; GN16 package supports compact layout.	Use Scenario: Coordinating startup of 1.8V, 3.3V, and 5V rails in automated test fixture where out-of-sequence power causes latch-up. IC Role / Device Role / Timing Role: Tracking controller using external resistor divider on TRACK/SS to align 1.8V ramp with master 3.3V rail. Use Value: Hardware-based tracking eliminates need for sequencer IC or firmware delay; internal 1µA current source ensures predictable soft-start slope.

Point-of-Load Regulation for FPGA Core

Li-Ion Powered Portable Instrumentation

Use Scenario: Regulating 1.8V/8A core supply for Xilinx Artix-7 FPGA with tight transient response requirements and thermal constraints.

IC Role / Device Role / Timing Role: Primary synchronous buck controller managing gate timing, current limiting, and soft-start sequencing for dual N-MOSFET power stage.

Use Value: 99% duty cycle maintains regulation during brownout; ±1% reference ensures FPGA VCCINT tolerance compliance; PGOOD enables safe configuration loading.

Use Scenario: Powering handheld medical analyzer with single-cell Li-ion (2.8–4.2V) and 1.8V analog front-end requiring ultra-low quiescent current.

IC Role / Device Role / Timing Role: Main system regulator implementing Burst Mode to extend battery life while maintaining fast wake-up capability.

Use Value: 7.5µA shutdown current minimizes standby drain; V_DS sensing avoids sense-resistor self-heating in sealed enclosure; 2.75V UVLO prevents deep discharge.

3.3V-to-1.8V Industrial I/O Module

Multi-Rail Sequencing in Test Equipment

Use Scenario: Converting 3.3V backplane supply to 1.8V for high-speed digital I/O buffers in PLC module with EMI-sensitive environment.

IC Role / Device Role / Timing Role: EMI-optimized controller synchronized to system clock via SYNC/MODE to avoid beat frequencies.

Use Value: External clock sync (250–750kHz) eliminates switching noise peaks; no sense resistor removes parasitic inductance path; GN16 package supports compact layout.

Use Scenario: Coordinating startup of 1.8V, 3.3V, and 5V rails in automated test fixture where out-of-sequence power causes latch-up.

IC Role / Device Role / Timing Role: Tracking controller using external resistor divider on TRACK/SS to align 1.8V ramp with master 3.3V rail.

Use Value: Hardware-based tracking eliminates need for sequencer IC or firmware delay; internal 1µA current source ensures predictable soft-start slope.

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#PBF	Same die in 12-pin DFN (3mm × 3mm); no PGOOD or SENSE– pins; uses SW pin for single-ended current sensing	Preferred for space-constrained designs where PGOOD is unnecessary and thermal performance favors DFN's lower θ_JA (43°C/W)	Select DDFN version when board area is critical and differential current sensing not required
MP2315DJ-LF-Z	Integrated MOSFETs (not controller); fixed 500kHz freq; no SYNC, no PGOOD, no TRACK/SS; 0.8V ref	Suitable for cost-sensitive, low-complexity 3A applications where external FETs and advanced features are unnecessary	Choose MP2315 for simplified BOM and layout where 8A output and precision tracking are not needed

Compared with LTC3822EGN-1#PBF, the LTC3822EDD-1#PBF offers identical control functionality in a smaller thermally superior package but lacks PGOOD and differential sensing, while the MP2315DJ-LF-Z trades flexibility and precision for integration and cost-making it unsuitable for high-current or multi-rail sequencing use cases.

Availability

LTC3822EGN-1#PBF is available at Aetrix Electronics and suitable for FPGA core supplies, Li-ion portable instrumentation, industrial I/O modules, and multi-rail test equipment requiring stable component supply and long-term manufacturability.

Supply support for LTC3822EGN-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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous automotive and industrial qualification standards.

The LTC3822EGN-1#PBF belongs to Linear's synchronous buck controller family designed specifically for low-input-voltage, high-efficiency point-of-load conversion in battery-powered and space-constrained systems.

FAQ

What is the function of the SENSE– pin on the LTC3822EGN-1#PBF?

The SENSE– pin (Pin 15) provides the negative input to the differential current comparator, enabling accurate V_DS-based current sensing across the top MOSFET by referencing against the SW pin. This differential architecture rejects common-mode noise and improves current limit accuracy compared to single-ended sensing used in the DFN variant. In all operating modes, LTC3822EGN-1#PBF relies on this pin to maintain stable current-mode control without a sense resistor.

Does the LTC3822EGN-1#PBF support external synchronization, and what is its valid frequency range?

Yes, the LTC3822EGN-1#PBF supports external clock synchronization via the SYNC/MODE pin over a range of 250kHz to 750kHz. When an external clock is applied, the internal oscillator phase-locks to it, disabling Burst Mode but permitting pulse skipping at light loads. The PLLLPF pin requires an RC network for loop filtering. This capability allows LTC3822EGN-1#PBF to eliminate beat frequencies in noise-sensitive applications such as medical imaging or precision test equipment.

How does the IPRG pin affect current limit setting on the LTC3822EGN-1#PBF?

The IPRG pin (Pin 10) configures the maximum allowable peak sense voltage (ΔV_SENSE(MAX)) between VIN and SW/SENSE– as 82mV (IPRG = GND), 125mV (IPRG = floating), or 200mV (IPRG = VIN). This directly scales the peak inductor current limit based on the top MOSFET's R_DS(ON), allowing optimal trade-off between current limit accuracy and conduction loss. For example, a 5mΩ MOSFET paired with 125mV yields ~25A theoretical peak, but LTC3822EGN-1#PBF's practical 8A rating reflects thermal and layout derating.

What protection features are implemented in the LTC3822EGN-1#PBF?

LTC3822EGN-1#PBF integrates output overvoltage protection (OVP) that disables the top MOSFET and activates the bottom MOSFET if VFB exceeds 0.68V, short-circuit protection that reduces switching frequency when VFB collapses, undervoltage lockout (UVLO) that disables operation below 2.25V, and reverse-current prevention via the RICMP comparator. The GN16 package adds PGOOD monitoring with ±10% window detection. All protections operate independently of software, ensuring robust hardware-level fault response in LTC3822EGN-1#PBF designs.

Can the LTC3822EGN-1#PBF be used with ceramic output capacitors, and what is the minimum recommended value?

Yes, the LTC3822EGN-1#PBF is fully compatible with low-ESR ceramic output capacitors. The typical application circuit specifies 47µF × 2 (94µF total) for 1.8V/8A operation with 0.47µH inductor. Minimum recommended capacitance depends on load transient requirements and allowable ripple; for ≤1% output ripple at 8A step, ≥60µF is advised. Ceramic capacitors must be rated for ≥6.3V DC bias and placed close to SW and GND pins to minimize loop inductance-critical for stable operation of LTC3822EGN-1#PBF's current-mode control.

LTC3822EGN-1#PBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 16-SSOP (0.154", 3.90mm Width)

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:: 16-SSOP

LTC3822EGN-1#PBF FAQ

1.How can I place an order for LTC3822EGN-1#PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC3822EGN-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 LTC3822EGN-1#PBF reliable?

The price and inventory of LTC3822EGN-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 LTC3822EGN-1#PBF is usually 5 days.

3.What payment methods are accepted for LTC3822EGN-1#PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3822EGN-1#PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC3822EGN-1#PBF?

LTC3822EGN-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC3822EGN-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 LTC3822EGN-1#PBF?

For technical support, including LTC3822EGN-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3822EGN-1#PBF requirements.

6.How does Aetrix verify that LTC3822EGN-1#PBF is sourced from the original manufacturer or authorized distributors?

All LTC3822EGN-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 LTC3822EGN-1#PBF meets industry standards.

7.What is the process for return or replacement of LTC3822EGN-1#PBF?

All LTC3822EGN-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3822EGN-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 LTC3822EGN-1#PBF part is unused and in its original packaging.

Return procedure for LTC3822EGN-1#PBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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