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Analog Devices Inc. LTC1622CS8#TRPBF
- Part No.:
- LTC1622CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1622CS8#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,403
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Product details
Overview
LTC1622CS8#TRPBF from Analog Devices (formerly Linear Technology) is a low-input-voltage, current-mode step-down DC/DC controller IC 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) - used in portable Li-ion–powered devices requiring stable 2.5V/3.3V/1.8V rails.
For engineers reviewing the LTC1622CS8#TRPBF datasheet, LTC1622CS8#TRPBF pinout, LTC1622CS8#TRPBF application, or LTC1622CS8#TRPBF equivalent, key selection considerations include its 2V UVLO threshold, P-channel MOSFET gate drive capability, OPTI-LOOP™ compensation, selectable Burst Mode™, and 8-lead MSOP package compatibility with space-constrained portable designs.
Technical Context
The LTC1622CS8#TRPBF implements constant-frequency current-mode control with an internal 0.8V reference and error amplifier driving the ITH pin to regulate peak inductor current. Its architecture includes slope compensation above 40% duty cycle, overvoltage lockout (16% above VREF), and short-circuit protection that reduces oscillator frequency to ~110kHz under fault conditions.
It integrates dual-function pins: RUN/SS provides soft-start timing (0.45s/µF) and shutdown control (<0.4V), while SYNC/MODE enables Burst Mode™ (≥2V), external synchronization (625–750kHz TTL/CMOS), or burst inhibition (grounded). Dropout operation maintains 100% duty cycle down to VIN ≈ VOUT + losses.
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 typical (475–625kHz) - permits use of compact 4.7µH inductors and reduces output filter size. |
| Reference Voltage | 0.8V ±1.9% - sets precise output voltage via external resistor divider (e.g., 2.5V = 0.8V × (1 + R2/R1)). |
| Quiescent Current | 350µA in Burst Mode™ sleep - extends battery runtime in light-load portable applications. |
| Shutdown Current | 15µA max - minimizes standby drain in always-on battery systems. |
| UVLO Threshold | 1.92V typical (1.55–2.3V) - prevents unstable regulation and MOSFET stress below safe input voltage. |
| Max Duty Cycle | 100% - sustains regulation during input voltage sag (e.g., battery discharge), maintaining output until VIN ≈ VOUT + PDRV drop + RSENSE × IOUT. |
Pinout & Package
Package: 8-lead MSOP (3mm × 3mm, 0.65mm pitch), RoHS-compliant, thermal resistance θJA = 250°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE– (1) | Negative current sense input | Connects to low-side of external current-sense resistor; sets peak inductor current threshold with ITH. |
| ITH (2) | Error amplifier output / current limit control | Voltage controls comparator trip point; 0–1.2V range enables OPTI-LOOP™ compensation and Burst Mode™ sleep/wake thresholds (0.12V/0.22V). |
| VFB (3) | Feedback input | Monitors resistive divider output; servo-controlled to 0.8V reference for precise output regulation. |
| RUN/SS (4) | Soft-start and enable/disable control | Internal 2.5µA current source charges external capacitor; <0.4V forces shutdown (15µA IQ); 0.7V enables operation. |
| SYNC/MODE (5) | Mode selection and sync input | ≥2V enables Burst Mode™; grounded or clock-driven (625–750kHz) disables burst and synchronizes switching. |
| GND (6) | Analog and power ground | Common return for feedback, sense, and gate drive paths; requires low-impedance PCB connection to minimize noise. |
| PDRV (7) | P-channel MOSFET gate driver | Swings 0V to VIN; drives external high-side P-MOSFET with 80ns rise/100ns fall time into 3000pF load. |
| VIN (8) | Main power supply input | Supplies internal circuitry and PDRV output; must be decoupled locally with low-ESR ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Reduces quiescent current to 350µA at light loads while maintaining regulation - critical for Li-ion battery longevity in standby. |
| OPTI-LOOP™ compensation | Allows stable transient response across wide COUT/ESR ranges without sacrificing bandwidth - simplifies output capacitor selection. |
| Low dropout (100% duty cycle) | Maintains regulated output as VIN approaches VOUT, extending usable battery voltage range by up to 15% in portable systems. |
| Undervoltage lockout (UVLO) | Shuts down at VIN < 1.92V (typ) - prevents erratic switching and MOSFET overheating during deep battery discharge. |
| Synchronization capability | Accepts external 625–750kHz clock on SYNC/MODE pin - enables EMI reduction via frequency dithering or system-level timing alignment. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Power management in GSM/UMTS handsets with dual Li-ion cells and dynamic RF power demands. IC Role / Device Role / Timing Role: Step-down controller generating 2.5V core voltage for baseband processor and 1.8V for memory interface. Use Value: Burst Mode™ cuts no-load IQ to 350µA, extending talk time by >12% versus continuous-mode controllers at light loads. | Use Scenario: Compact LTE/5G data modems operating from single-cell Li-ion (3.0–4.2V) with bursty data transmission. IC Role / Device Role / Timing Role: High-frequency (550kHz) DC/DC controller delivering 3.3V to RF transceiver and baseband ICs. Use Value: Small MSOP-8 footprint and 4.7µH inductor enable <120mm² total solution area - essential for M.2 and mini-PCIe modem modules. |
| Portable Computers | Battery-Powered Test Equipment |
Use Scenario: Sub-3.3V rail generation in ultraportable notebooks and tablets with aggressive thermal constraints. IC Role / Device Role / Timing Role: Primary buck controller for 2.5V I/O supply, synchronized to system clock to minimize conducted EMI. Use Value: 750kHz sync capability allows alignment with SoC clock domains, reducing spectral peaks and easing EMC certification. | Use Scenario: Field-deployable handheld analyzers requiring >10-hour runtime on integrated Li-ion packs. IC Role / Device Role / Timing Role: Main 1.8V/2.5V power stage with UVLO set to 1.92V to maximize usable battery capacity before shutdown. Use Value: 100% duty cycle dropout operation extracts final 0.3V of battery energy - increasing usable capacity by 8–10% versus non-dropout controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3866EMSE#PBF | Higher VIN max (38V), supports N-channel MOSFETs, no Burst Mode™, 500kHz fixed freq | Designed for industrial/high-VIN applications; lacks low-IQ sleep mode for battery optimization | Select only if input exceeds 10V or N-MOSFET topology is required; not suitable for sub-2V UVLO or ultra-low-IQ portable use. |
| TPS54202DRCT | Integrated N-MOSFETs, 3–17V VIN, 450kHz, 25µA shutdown IQ, no UVLO below 3V | Monolithic solution with lower BOM count but higher thermal density; no 100% duty cycle dropout | Prefer for cost-sensitive, medium-power apps where board space > efficiency; avoid when VIN may dip below 3V or dropout operation is needed. |
Compared with LTC1622CS8#TRPBF, LTC3866EMSE#PBF trades battery-specific features (Burst Mode™, 2V UVLO) for industrial robustness, while TPS54202DRCT sacrifices dropout capability and low-VIN operation for integration - making LTC1622CS8#TRPBF uniquely suited for Li-ion–fed portable systems demanding both efficiency and deep-discharge support.
Availability
LTC1622CS8#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, and portable computers requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LTC1622CS8#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 precision analog and power management product lines with full technical documentation and long-term support.
The LTC1622CS8#TRPBF belongs to Linear's legacy high-efficiency DC/DC controller family, engineered specifically for battery-powered portable electronics needing wide VIN range, ultra-low IQ, and reliable dropout performance.
FAQ
What is the minimum input voltage required for normal operation of the LTC1622CS8#TRPBF?
The LTC1622CS8#TRPBF has an undervoltage lockout (UVLO) threshold of 1.92V typical (1.55–2.3V), meaning it begins normal regulation only when VIN rises above this level. Below 1.92V, the device shuts down completely, drawing just 15µA. This ensures stable operation across the usable discharge curve of single- or dual-cell Li-ion batteries, and the LTC1622CS8#TRPBF remains functional down to 2V per the absolute maximum rating.
Does the LTC1622CS8#TRPBF support synchronization to an external clock, and what is the valid frequency range?
Yes, the LTC1622CS8#TRPBF supports external synchronization via the SYNC/MODE pin. It accepts TTL/CMOS-compatible clock signals from 625kHz to 750kHz, locking to the rising edge. Synchronizing below 625kHz is prohibited as it may cause abnormal operation and unpredictable frequency spectra. The LTC1622CS8#TRPBF does not support synchronization below its default minimum operating frequency, and burst mode is automatically disabled during sync operation.
How does Burst Mode™ operation improve efficiency in the LTC1622CS8#TRPBF, and when is it active?
Burst Mode™ operation in the LTC1622CS8#TRPBF reduces quiescent current to 350µA by disabling switching cycles during light loads - pulsing only enough to maintain regulation. It activates automatically when the SYNC/MODE pin is left open or pulled to ≥2V. Burst Mode™ is inhibited during synchronization or when SYNC/MODE is grounded. The LTC1622CS8#TRPBF uses ITH voltage thresholds (0.12V sleep, 0.22V wake) to manage burst entry/exit, directly extending battery runtime in portable applications.
What package type and thermal characteristics does the LTC1622CS8#TRPBF use?
The LTC1622CS8#TRPBF is housed in an 8-lead MSOP package (3mm × 3mm, 0.65mm pitch) with θJA = 250°C/W. This compact RoHS-compliant package supports high-density layouts in portable electronics. Its exposed pad variant (LTC1622CMS8) offers improved thermal performance (θJA = 150°C/W), but the LTC1622CS8#TRPBF version relies on standard PCB copper pour for heat dissipation - design guidelines recommend ≥2cm² of 2-oz copper connected to GND for optimal thermal management.
Can the LTC1622CS8#TRPBF operate in 100% duty cycle dropout mode, and how does it behave near VIN = VOUT?
Yes, the LTC1622CS8#TRPBF supports true 100% duty cycle operation, allowing the external P-channel MOSFET to remain continuously on as VIN approaches VOUT. In this dropout region, output voltage equals VIN minus voltage drops across the MOSFET RDS(ON), current-sense resistor, and inductor DCR. This behavior maximizes usable battery energy - the LTC1622CS8#TRPBF sustains regulation down to VIN ≈ VOUT + 0.2V under typical conditions, significantly extending runtime versus controllers lacking dropout capability.
LTC1622CS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (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):
- 2V ~ 10V
- Frequency - Switching:
- -
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- No
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Soft Start
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1622CS8#TRPBF FAQ
1.How can I place an order for LTC1622CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1622CS8#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 LTC1622CS8#TRPBF reliable?
The price and inventory of LTC1622CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1622CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1622CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1622CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1622CS8#TRPBF?
LTC1622CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1622CS8#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 LTC1622CS8#TRPBF?
For technical support, including LTC1622CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1622CS8#TRPBF requirements.
6.How does Aetrix verify that LTC1622CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1622CS8#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 LTC1622CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1622CS8#TRPBF?
All LTC1622CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1622CS8#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 LTC1622CS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1622CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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