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Analog Devices Inc. LTC1622IS8#TR
- Part No.:
- LTC1622IS8#TR
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1622IS8#TR.pdf
- Description:
- IC REG CTRLR BUCK 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:19,000
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Product details
Overview
LTC1622IS8#TR from Analog Devices (formerly Linear Technology) is a low-input-voltage, current-mode step-down DC/DC controller designed for high-efficiency power conversion in battery-powered systems. It operates from 2V to 10V input, delivers multiampere output currents, features ±1.9% reference accuracy, 550kHz fixed switching frequency, and supports Burst Mode™ operation for ultra-low quiescent current (350µA) and dropout operation at 100% duty cycle. It is used in portable Li-ion–powered devices requiring stable, compact, and efficient regulation to 1.8V/2.5V/3.3V rails.
For engineers reviewing the LTC1622IS8#TR datasheet, LTC1622IS8#TR pinout, LTC1622IS8#TR application, or LTC1622IS8#TR equivalent, key selection considerations include its industrial-grade temperature range (–45°C to 85°C), MSOP-8 package footprint, SYNC/MODE pin programmability for Burst Mode or synchronization up to 750kHz, OPTI-LOOP™ compensation for minimal output capacitance, and undervoltage lockout activation at 1.92V (typical).
Technical Context
The LTC1622IS8#TR implements a constant-frequency current-mode control architecture with an internal 0.8V reference and error amplifier driving the ITH pin to regulate peak inductor current. Its current comparator monitors voltage across an external sense resistor (SENSE– pin), while slope compensation activates above 40% duty cycle to ensure stability.
It integrates dual-function pins: RUN/SS controls soft-start ramping (0.45s/µF) and shutdown (<0.4V), and SYNC/MODE enables Burst Mode (≥2V), external synchronization (625–750kHz TTL/CMOS), or burst defeat (grounded). The PDRV pin provides rail-to-rail gate drive (0V to VIN) for external P-channel MOSFETs, and overvoltage lockout triggers at +16% VOUT deviation with 35mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2V to 10V - Enables direct operation from single- or dual-cell Li-ion batteries without pre-regulation. |
| Switching Frequency | 550kHz (typ), synchronizable to 625–750kHz - Allows use of sub-5mm inductors and reduces EMI filtering burden. |
| Reference Voltage | 0.8V ±1.9% (industrial grade) - Sets precise output voltage via external resistor divider; supports 1.8V/2.5V/3.3V outputs. |
| Quiescent Current | 350µA (Burst Mode active) - Extends runtime in low-load portable applications such as wireless modems. |
| Shutdown Current | 15µA (typ) - Minimizes battery drain during system sleep states. |
| UVLO Threshold | 1.92V (typ, VIN ramping down) - Prevents unstable operation near battery depletion while retaining margin for 2V cutoff. |
| Max Duty Cycle | 100% - Maintains regulated output during input voltage sag (e.g., Li-ion discharge from 4.2V to 2.7V). |
Pinout & Package
Package: 8-lead MSOP (3mm × 3mm, 0.65mm pitch), thermally enhanced for industrial ambient (–45°C to 85°C) operation. Pin 6 is exposed pad (GND) for improved thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE– (1) | Negative current sense input | Connects to low-side of external RSENSE; sets peak inductor current threshold with ITH voltage. |
| ITH (2) | Error amplifier output / compensation node | Controls current comparator threshold; OPTI-LOOP™ compensation applied here for loop stability. |
| VFB (3) | Feedback input | Monitors resistive divider output; servo-controlled to 0.8V reference for output regulation. |
| RUN/SS (4) | Soft-start and enable control | Internal 2.5µA current source charges CSS; <0.4V forces shutdown; 0.7V initiates operation. |
| SYNC/MODE (5) | Mode selection and sync input | ≥2V enables Burst Mode; grounded or clock-driven disables Burst Mode and enables sync up to 750kHz. |
| GND (6) | Power and signal ground | Exposed pad connection; must be soldered to PCB ground plane for thermal and noise performance. |
| PDRV (7) | P-channel MOSFET gate driver | Swings 0V to VIN; drives external high-side switch with 80ns rise/100ns fall time into 3000pF. |
| VIN (8) | Main power supply input | Supplies internal circuitry and PDRV; requires local 10µF ceramic decoupling to GND (Pin 6). |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Reduces quiescent current to 350µA at light loads while maintaining regulation-critical for standby efficiency in cellular telephones. |
| OPTI-LOOP™ compensation | Enables stable transient response with minimal output capacitance (e.g., 47µF POSCAP + 220pF ceramic), reducing board area and cost. |
| 100% duty cycle dropout | Extends usable battery range by sustaining regulation even when VIN ≈ VOUT-essential for 1-cell Li-ion systems dropping to 2.7V. |
| Synchronization capability | Accepts external 625–750kHz clock on SYNC/MODE pin to eliminate beat frequencies in multi-rail systems or meet EMI requirements. |
| Industrial temperature grade | Specified from –45°C to 85°C with guaranteed ±1.9% VREF accuracy-suitable for ruggedized portable equipment and distributed power systems. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Power management in GSM/UMTS handsets with dynamic load profiles ranging from 1mA (standby) to 1.5A (transmit burst). IC Role / Device Role / Timing Role: Step-down DC/DC controller regulating 3.3V RF and baseband supplies from a single 3.7V Li-ion cell. Use Value: Burst Mode™ cuts no-load IQ to 350µA, extending talk time; 550kHz switching allows compact 4.7µH inductor and small MSOP-8 footprint. | Use Scenario: Compact LTE/WiMAX CPE modems operating on battery backup during AC outage. IC Role / Device Role / Timing Role: Primary 2.5V/1.8V regulator for baseband processor and memory, supporting rapid load transients during data transmission. Use Value: Current-mode control ensures <10µs load-step response; 100% duty cycle maintains regulation as battery discharges from 4.2V to 2.8V. |
| Portable Computers | Distributed Power Systems |
Use Scenario: Auxiliary rail generation in ultrabooks for SSD interface or USB-C PD negotiation logic. IC Role / Device Role / Timing Role: High-efficiency buck controller delivering 1.8V @ 1.2A from shared 5V or 3.3V system bus. Use Value: Synchronization to system clock (via SYNC/MODE) eliminates switching noise coupling into sensitive analog circuits. | Use Scenario: Local point-of-load regulation in industrial IoT gateways with multiple isolated 3.3V/2.5V subsystems. IC Role / Device Role / Timing Role: Distributed buck controller enabling independent power sequencing and fault containment per module. Use Value: RUN/SS pin allows coordinated startup/shutdown across modules; industrial temp grade ensures reliability in unventilated enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3621EDD#TRMPBF | Monolithic 2A buck regulator (integrated MOSFETs); 3–17V input; 500kHz fixed freq; 2.5µA IQ in shutdown. | Eliminates external MOSFET and diode but lacks Burst Mode and 2V start-up; not suitable for <2.5V input or ultra-low-IQ battery hold-up. | Select when board space is constrained and input >3V; avoid when VIN may dip below 2.5V or Burst Mode efficiency is required. |
| TPS54202DDCR | Current-mode buck controller (external FETs); 4.5–17V input; 500kHz; 1.8µA shutdown IQ; no UVLO below 4.5V. | Higher minimum VIN prevents use with single Li-ion; lacks OPTI-LOOP™ and industrial temp grade; lower cost for non-battery apps. | Select for 5V/12V intermediate bus applications where 2V start-up and –45°C operation are unnecessary. |
Compared with LTC3621EDD#TRMPBF and TPS54202DDCR, the LTC1622IS8#TR uniquely supports true 2V start-up, industrial temperature operation, and Burst Mode™ for sub-mA load efficiency-making it irreplaceable in single-cell Li-ion portable designs demanding long battery life and wide input range.
Availability
LTC1622IS8#TR is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, and portable computers requiring stable component supply with guaranteed industrial temperature performance and long-term obsolescence management.
Supply support for LTC1622IS8#TR 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 continues to manufacture and support its precision analog and power management portfolio.
The LTC1622IS8#TR belongs to Linear's legacy high-efficiency DC/DC controller family, engineered specifically for battery-powered portable electronics requiring ultra-low IQ, wide VIN range, and robust transient response in minimal PCB area.
FAQ
What is the minimum input voltage required for the LTC1622IS8#TR to start switching?
The LTC1622IS8#TR incorporates an undervoltage lockout (UVLO) that disables operation when VIN falls below 1.92V (typical, industrial grade). It begins switching once VIN rises above this threshold, enabling reliable start-up from deeply discharged single-cell Li-ion batteries down to ~2.0V. The device draws only 15µA in shutdown, preserving battery charge until sufficient voltage is restored.
How does the SYNC/MODE pin affect Burst Mode™ operation in the LTC1622IS8#TR?
In the LTC1622IS8#TR, Burst Mode™ is enabled when the SYNC/MODE pin voltage exceeds 1.5V (typical threshold); it is disabled when the pin is grounded or driven with an external clock signal (625–750kHz). During synchronization, Burst Mode™ is automatically inhibited to maintain deterministic timing-ensuring predictable EMI behavior in noise-sensitive applications like cellular RF sections.
Can the LTC1622IS8#TR operate with a 1.8V output using standard resistor values?
Yes. The LTC1622IS8#TR regulates based on a 0.8V internal reference. To set VOUT = 1.8V, use R1 = 10kΩ and R2 = 12.5kΩ in the feedback divider (VOUT = 0.8V × (1 + R2/R1)). This configuration is validated in Linear's application notes and maintains ±1.9% accuracy across the industrial temperature range, making it suitable for powering low-voltage microcontrollers and memory in portable systems.
What is the purpose of the ITH pin in the LTC1622IS8#TR, and how is it used for compensation?
ITH is the error amplifier output and current comparator threshold control node in the LTC1622IS8#TR. OPTI-LOOP™ compensation-typically a series RC network from ITH to GND-shapes the control loop to achieve stability with minimal output capacitance. Unlike conventional type-II compensation, this method allows stable operation with just 47µF POSCAP + 220pF ceramic, reducing solution size and cost without sacrificing transient response.
Does the LTC1622IS8#TR provide overvoltage protection, and how does it behave?
Yes. The LTC1622IS8#TR includes an overvoltage comparator that disables the PDRV output when VFB exceeds 0.928V (0.8V × 1.16), corresponding to +16% VOUT deviation. It features 35mV hysteresis to prevent chatter during recovery. This protection remains active regardless of RUN/SS or SYNC/MODE state, safeguarding downstream 1.8V/2.5V ICs from damage during feedback divider failure or load dump events.
LTC1622IS8#TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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):
- 2V ~ 10V
- Frequency - Switching:
- -
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- No
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Soft Start
- Operating Temperature:
- -45°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1622IS8#TR FAQ
1.How can I place an order for LTC1622IS8#TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1622IS8#TR 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 LTC1622IS8#TR reliable?
The price and inventory of LTC1622IS8#TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1622IS8#TR is usually 5 days.
3.What payment methods are accepted for LTC1622IS8#TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1622IS8#TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1622IS8#TR?
LTC1622IS8#TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1622IS8#TR 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 LTC1622IS8#TR?
For technical support, including LTC1622IS8#TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1622IS8#TR requirements.
6.How does Aetrix verify that LTC1622IS8#TR is sourced from the original manufacturer or authorized distributors?
All LTC1622IS8#TR 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 LTC1622IS8#TR meets industry standards.
7.What is the process for return or replacement of LTC1622IS8#TR?
All LTC1622IS8#TR units undergo pre-shipment inspection (PSI). If there is an issue with LTC1622IS8#TR, 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 LTC1622IS8#TR part is unused and in its original packaging.
Return procedure for LTC1622IS8#TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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