My Inquiry
My Account
Analog Devices Inc. LTC3822EMSE#PBF
- Part No.:
- LTC3822EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3822EMSE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:147
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3822EMSE#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 and delivering up to 8A output at 1.8V with 550kHz switching frequency in a 10-lead MSOP package. It implements constant-frequency current-mode control using VDS sensing across the top MOSFET for high efficiency in Li-ion battery-powered systems.
For engineers reviewing the LTC3822EMSE#PBF datasheet, LTC3822EMSE#PBF pinout, LTC3822EMSE#PBF application, or LTC3822EMSE#PBF equivalent, key selection considerations include its no-RSENSE architecture, 99% max duty cycle for low-dropout operation, ±1% 0.6V reference accuracy, selectable 300/550/750kHz frequency, and digital RUN pin for micropower shutdown (IQ = 7.5μA).
Technical Context
The LTC3822EMSE#PBF uses a constant-frequency current-mode architecture where peak inductor current is determined by the voltage on the ITH pin and the VDS of the external top MOSFET sensed between VIN and SW pins. Its differential current comparator eliminates sense resistors, while slope compensation activates above 20% duty cycle to maintain stability.
It integrates anti-shoot-through gate drive logic for TG and BG outputs, supports bootstrapped high-side drive via BOOST/SW, and features internal soft-start (650μs ramp), output overvoltage protection (0.68V threshold at VFB), and undervoltage lockout (2.25V rising threshold). The FREQ and IPRG pins enable programmable switching frequency and peak current sense threshold (70–220mV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.75V to 4.5V - Enables direct regulation from single-cell Li-ion (3.0–4.2V) or 3.3V rail without pre-regulation. |
| Reference Voltage | 0.6V ±1% - Sets precise output voltage via external resistor divider; enables 1.8V @ 8A with 59k/118k divider. |
| Max Duty Cycle | 99% - Supports ultra-low dropout operation (e.g., VOUT = 3.2V from VIN = 3.3V), critical for battery end-of-discharge. |
| Switching Frequency | 300/550/750kHz (pin-selectable) - Balances efficiency (lower f) vs. component size (higher f); 550kHz nominal enables compact 0.47μH inductors. |
| Peak Sense Threshold | 70–220mV (via IPRG) - Determines maximum allowable VDS across top MOSFET; sets IOUT(MAX) = ΔVSENSE/RDS(ON) – IRIPPLE/2. |
| Shutdown Current | 7.5μA - Enables long battery standby life; achieved by pulling RUN pin below 1.1V to disable all circuitry except UVLO block. |
| Soft-Start Time | 650μs - Internal linear ramp of VFB from 0.05V to 0.55V prevents inrush current and ensures controlled VOUT rise during startup. |
Pinout & Package
Package: 10-Lead Plastic MSOP (MSE), thermally enhanced with exposed GND pad soldered to PCB for optimal thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BG (Pin 1) | Bottom Gate Driver Output | Drives gate of external synchronous N-MOSFET; swing = GND to BOOST; must be non-overlapping with TG to prevent shoot-through. |
| TG (Pin 2) | Top Gate Driver Output | Drives gate of external high-side N-MOSFET; swing = GND to BOOST; requires bootstrap capacitor (CB) between BOOST and SW. |
| BOOST (Pin 3) | Bootstrap Supply Input | Provides gate drive voltage for TG; charged via Schottky diode from VIN to SW; swings from VIN to 2×VIN during operation. |
| VIN (Pin 4) | Main Power Input | Powers control circuitry and serves as positive input to current comparator; not locally decoupled to preserve current-sense integrity. |
| SW (Pin 5) | Switch Node | Connects to source of top MOSFET, drain of bottom MOSFET, and inductor; negative input to current comparator and reverse-current detector. |
| FREQ (Pin 6) | Frequency Select Input | GND = 300kHz, floating = 550kHz, VIN = 750kHz - enables optimization of efficiency vs. BOM size without external components. |
| IPRG (Pin 7) | Peak Sense Threshold Select | GND = 82mV, floating = 120mV, VIN = 200mV - configures maximum allowed VDS across top MOSFET to set current limit. |
| VFB (Pin 8) | Feedback Input | Receives divided output voltage; compared to 0.6V reference; ±1% accuracy ensures tight output regulation under line/load transients. |
| ITH (Pin 9) | Error Amp Compensation / Current Threshold | Sets peak inductor current threshold; nominal range 0.7V–2V; clamped internally to limit ΔVSENSE(MAX). |
| RUN (Pin 10) | Enable Control Input | <1.1V = shutdown (7.5μA IQ); ≥1.1V = enabled with internal soft-start; open-drain compatible with logic-level signals. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE architecture | Eliminates power loss and board space of external sense resistor; improves efficiency by ~1–2% at 8A by removing I²R dissipation. |
| All-N-channel MOSFET support | Enables lower RDS(ON) and cost-effective synchronous rectification vs. P-channel or diode solutions; requires sublogic-level MOSFETs (VGS(th) ≤ 2.5V). |
| Digital RUN pin with micropower shutdown | Reduces system standby power to 7.5μA; enables host MCU to fully power-gate the regulator during sleep modes without external circuitry. |
| Output overvoltage protection (OVP) | Shuts off TG and turns on BG when VFB exceeds 0.68V (13.33% above 0.6V ref); protects downstream loads from transient overshoots or feedback loop faults. |
| Programmable peak current sense threshold | Three settings (70/120/220mV) via IPRG pin allow optimization of RDS(ON) trade-off: lower threshold enables higher RDS(ON) MOSFETs (cost savings), higher threshold supports lower RDS(ON) for high-current designs. |
Applications
| 3.3V Input Systems | Li-Ion Battery Systems |
|---|---|
Use Scenario: Regulating stable 1.8V or 2.5V supply from a fixed 3.3V rail in industrial I/O modules or FPGA auxiliary power. IC Role / Device Role / Timing Role: Synchronous step-down controller managing external N-MOSFETs to deliver high-efficiency, low-noise power with minimal external components. Use Value: Achieves >92% efficiency at 8A/1.8V with 550kHz switching, reducing thermal load and enabling compact 3mm × 3mm DFN or MSOP footprint on dense PCBs. | Use Scenario: Powering baseband processors or RF transceivers in portable medical devices powered by single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: Low-input-voltage DC/DC controller maintaining regulated output during battery discharge from 4.2V down to 2.75V with 99% duty cycle. Use Value: Extends usable battery runtime by sustaining full 8A output even at end-of-discharge (e.g., 2.8V input → 1.8V/8A), avoiding premature system shutdown. |
| High-Current Point-of-Load | Low-Dropout Backup Supplies |
Use Scenario: Delivering 1.0V/6A to ASIC cores in test equipment where fast load transient response is required. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller providing excellent line/load transient response via direct inductor current sensing and fast error amplifier. Use Value: Limits output voltage deviation to <±20mV under 0→6A step load (500ns response), eliminating need for large bulk capacitance. | Use Scenario: Providing fail-safe 3.3V backup to microcontroller reset circuitry when main 5V supply fails. IC Role / Device Role / Timing Role: Ultra-low dropout controller operating at 99% duty cycle to generate 3.3V from marginal 3.33V input during brownout conditions. Use Value: Maintains regulated output down to VIN = 3.33V (ΔV = 30mV headroom), preventing MCU reset during brief input sags where conventional controllers would drop out. |
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#PBF | Wider VIN range (4–38V), integrated 5V bias LDO, no IPRG pin; requires external sense resistor. | Designed for higher-input industrial/motor-control rails; lacks no-RSENSE benefit for low-VIN battery apps. | Select only if input exceeds 4.5V or bias rail generation is needed; not suitable for 2.75–4.5V Li-ion systems. |
| MP2307DN-LF-Z | Integrated MOSFETs (3A), fixed 500kHz, no IPRG/FREQ select, no OVP, 3.5–28V VIN. | Compact monolithic solution for medium-current apps; lacks programmability, precision ref, and protection features. | Choose for cost-sensitive, space-constrained 3A designs where external MOSFET flexibility and robust protection are not required. |
Compared with LTC3822EMSE#PBF, LTC3850EMSE#PBF trades no-RSENSE and low-VIN capability for higher input range and integrated biasing, while MP2307DN-LF-Z sacrifices design flexibility and protection for integration and lower BOM count - making LTC3822EMSE#PBF uniquely suited for high-efficiency, programmable, low-input-voltage synchronous buck control.
Availability
LTC3822EMSE#PBF is available at Aetrix Electronics and suitable for Li-ion battery systems, 3.3V input power supplies, and high-current point-of-load regulators requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC3822EMSE#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, serving industrial, automotive, communications, and healthcare markets.
The LTC3822EMSE#PBF belongs to Linear's No RSENSE synchronous controller product line, designed specifically for high-efficiency, low-input-voltage DC/DC conversion in battery-powered and space-constrained applications where sense-resistor losses and board area must be minimized.
FAQ
What is the minimum input voltage supported by the LTC3822EMSE#PBF?
The LTC3822EMSE#PBF supports an absolute minimum input voltage of 2.75V per its specified operating range. Below this, undervoltage lockout (UVLO) disables operation - the rising UVLO threshold is 2.25V, but guaranteed functional operation begins at 2.75V. At 2.75V input, the device maintains regulation down to VOUT ≈ 2.7V (99% duty cycle), though maximum output current is reduced relative to higher VIN due to gate drive limitations and RDS(ON) increase.
How does the LTC3822EMSE#PBF achieve current sensing without a sense resistor?
The LTC3822EMSE#PBF performs current sensing by measuring the voltage drop (VDS) across the external top N-channel MOSFET between the VIN and SW pins. This VDS-based method eliminates the power loss and board space of a discrete sense resistor. The peak sense voltage is programmable via the IPRG pin (70/120/220mV), and slope compensation is automatically applied above 20% duty cycle to ensure stability.
Can the LTC3822EMSE#PBF be used with a 5V gate drive instead of bootstrapping?
Yes - the LTC3822EMSE#PBF supports an alternative 5V gate drive configuration. By connecting a dedicated 5V supply to the BOOST pin (instead of bootstrapping from VIN), the TG driver swing becomes 5V to (5V + VIN), enabling robust gate drive for higher RDS(ON) MOSFETs or improved efficiency at low VIN. In this mode, BOOST draws ~500μA in shutdown, and the external Schottky diode is omitted.
What is the purpose of the exposed pad on the LTC3822EMSE#PBF MSOP package?
The exposed pad on the LTC3822EMSE#PBF MSOP package is electrically and thermally connected to GND. It must be soldered to a PCB ground plane to ensure both electrical integrity (low-impedance return path for gate drivers and power circuits) and optimal thermal performance (θJA = 40°C/W). Failure to solder the pad degrades efficiency, increases junction temperature, and risks thermal shutdown under load.
Does the LTC3822EMSE#PBF provide short-circuit protection?
Yes - the LTC3822EMSE#PBF implements short-circuit protection by monitoring the VFB pin. When VFB falls near ground (indicating VOUT collapse), 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, and operates independently of the overvoltage protection circuit.
LTC3822EMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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:
- 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#PBF FAQ
1.How can I place an order for LTC3822EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3822EMSE#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 LTC3822EMSE#PBF reliable?
The price and inventory of LTC3822EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3822EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3822EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3822EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3822EMSE#PBF?
LTC3822EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3822EMSE#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 LTC3822EMSE#PBF?
For technical support, including LTC3822EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3822EMSE#PBF requirements.
6.How does Aetrix verify that LTC3822EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3822EMSE#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 LTC3822EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3822EMSE#PBF?
All LTC3822EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3822EMSE#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 LTC3822EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3822EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3822EMSE#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…
