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Analog Devices Inc. LTC1622CS8#PBF
- Part No.:
- LTC1622CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1622CS8#PBF.pdf
- Description:
- IC REG CTRLR BUCK 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,706
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Product details
Overview
LTC1622CS8#PBF from Analog Devices (formerly Linear Technology) is a constant-frequency current-mode step-down DC/DC controller designed for low-input-voltage battery-powered systems. It operates from 2V to 10V input, delivers multiampere output currents with ±1.9% reference accuracy, supports 550kHz fixed switching frequency (synchronizable to 750kHz), and features Burst Mode™ operation for high light-load efficiency in portable Li-ion applications.
For engineers reviewing the LTC1622CS8#PBF datasheet, LTC1622CS8#PBF pinout, LTC1622CS8#PBF application, or LTC1622CS8#PBF equivalent, key selection considerations include its 8-lead SO package, P-channel MOSFET gate drive capability, undervoltage lockout at 1.92V (typ), OPTI-LOOP™ compensation, and dropout operation with 100% duty cycle - all critical for compact, high-efficiency buck converter designs in space-constrained portable electronics.
Technical Context
The LTC1622CS8#PBF implements a current-mode control architecture with an internal 0.8V reference, error amplifier, and current comparator referenced to the SENSE– pin. Its ITH pin serves as both compensation node and peak-current threshold control point, enabling stable loop response across wide load and line variations.
It integrates dual-mode operation: standard continuous conduction mode (CCM) with 550kHz oscillator, and selectable Burst Mode™ for sub-1mA quiescent current at light loads. Synchronization is edge-triggered on SYNC/MODE pin, active only above 625kHz, and disabled during short-circuit conditions (feedback < 0.3V) to prevent instability.
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 up to 750kHz - allows use of small, low-profile inductors (e.g., 4.7µH) and reduces output filter size. |
| Reference Voltage | 0.8V ±1.9% (Commercial grade) - sets precise output voltage via external resistor divider; determines regulation accuracy of final VOUT. |
| Quiescent Current | 350µA (Sleep Mode), 15µA (Shutdown) - extends battery runtime in standby and off states for portable equipment. |
| UVLO Threshold | 1.92V (typ, VIN ramping down) - prevents erratic operation and MOSFET stress below safe input voltage; shuts down entire controller except UVLO block. |
| Max Duty Cycle | 100% - supports dropout operation where VIN ≈ VOUT; maintains regulation by holding P-MOSFET fully on. |
| Current Sense Range | 80–140mV (ΔVSENSE(MAX)) - defines maximum allowable voltage drop across RSENSE, directly setting peak inductor current limit. |
Pinout & Package
Package: 8-lead plastic SO (Small Outline), 150°C/W junction-to-ambient thermal resistance (θJA), RoHS-compliant, surface-mountable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: SENSE– | Negative input to current comparator | Senses voltage drop across external RSENSE to regulate peak inductor current; referenced to GND. |
| 2: ITH | Error amplifier output / current threshold control | Controls peak inductor current magnitude; also used for OPTI-LOOP™ compensation network connection. |
| 3: VFB | Inverting input of error amplifier | Receives feedback voltage from output divider; servo-controlled to 0.8V for precise output regulation. |
| 4: RUN/SS | Soft-start timing & shutdown enable | Internal 2.5µA current source charges external capacitor for controlled startup; <0.4V forces shutdown (IQ ≈ 15µA). |
| 5: SYNC/MODE | Mode selection & external clock input | Open or ≥2V enables Burst Mode™; TTL/CMOS clock (625–750kHz) forces synchronization; internal 1µA pull-up. |
| 6: GND | Analog and power ground reference | Common return path for feedback, current sense, and internal circuitry; must be low-impedance and star-connected. |
| 7: PDRV | P-channel MOSFET gate driver output | Swings from 0V to VIN to drive external high-side P-MOSFET; capable of 1A peak pulsed current. |
| 8: VIN | Main power supply input | Supplies internal bias and gate drive; requires local ceramic decoupling (e.g., 10µF X5R) close to pin and GND. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ Operation | Reduces quiescent current to 350µA and improves light-load efficiency - essential for battery longevity in intermittent-use devices like modems and scanners. |
| OPTI-LOOP™ Compensation | Allows stable transient response with wide range of output capacitors (including low-ESR POSCAP/OS-CON), minimizing need for large bulk capacitance. |
| 100% Duty Cycle Dropout | Maintains regulation as VIN approaches VOUT by holding P-MOSFET fully on - avoids output collapse during brownout or deep discharge. |
| Undervoltage Lockout (UVLO) | Shuts down controller below 1.92V (typ) to protect battery and prevent MOSFET shoot-through or erratic switching. |
| Synchronization Capability | Accepts external 625–750kHz clock on SYNC/MODE pin - enables EMI reduction via frequency dithering or system-level clock alignment. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Power management in GSM/UMTS handsets requiring regulated 2.5V or 3.3V rails from single Li-ion cell (2.7–4.2V). IC Role / Device Role / Timing Role: Step-down DC/DC controller driving external P-MOSFET and Schottky diode to generate stable core voltage with minimal PCB area. Use Value: Burst Mode™ extends talk time by >30% vs. forced-PWM controllers under standby load; 550kHz operation enables 4.7µH inductor and compact layout. | Use Scenario: Compact broadband modem powered by USB or Li-ion battery, needing efficient 3.3V/1.8V conversion with low noise. IC Role / Device Role / Timing Role: Primary buck controller managing dynamic load transients during data transmission bursts while maintaining tight output regulation. Use Value: Current-mode control ensures fast load-step response (<100µs recovery); SYNC/MODE pin allows EMI-sensitive designs to lock to host system clock. |
| Portable Computers | Battery-Powered Scanners |
Use Scenario: Subsystem power for SSD interface, display backlight logic, or USB peripherals in ultra-thin notebooks. IC Role / Device Role / Timing Role: High-efficiency, low-noise step-down controller delivering up to 1.5A at 2.5V or 1.8V from shared 3.3V or 5V rail. Use Value: ±1.9% reference accuracy ensures compliance with tight voltage tolerances of modern SoCs; MSOP-compatible SO package simplifies layout and rework. | Use Scenario: Handheld barcode scanner operating from 2-cell alkaline or Li-ion, requiring reliable 3.3V for CMOS image sensor and MCU. IC Role / Device Role / Timing Role: Main power controller supporting wide input range (2V–10V) and graceful degradation during battery depletion. Use Value: 100% duty cycle dropout sustains operation down to 2.1V battery voltage; UVLO prevents malfunction at end-of-life battery voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3502AIS8#PBF | Higher VIN max (40V), integrated 1.1A N-MOSFET, no Burst Mode, 2.2MHz switching | Designed for higher-input industrial supplies; lacks low-VIN optimization and light-load efficiency features | Select when input exceeds 10V or board space prohibits external FET; not suitable for <3V operation. |
| TPS54202DRCT | Integrated N-MOSFET, 4.5–17V VIN, 2A output, Eco-mode™ (not Burst Mode), 500kHz | Optimized for mid-range input; lower light-load efficiency than LTC1622CS8#PBF due to different control architecture | Prefer for cost-sensitive 5V-input applications; avoid where 2V start-up or sub-200µA IQ is required. |
Compared with LT3502AIS8#PBF and TPS54202DRCT, the LTC1622CS8#PBF uniquely supports true 2V start-up, delivers superior light-load efficiency via Burst Mode™, and enables P-MOSFET-based high-side switch topologies ideal for low-VIN battery systems - making it irreplaceable in single-cell Li-ion portable designs demanding long runtime and compact footprint.
Availability
LTC1622CS8#PBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, and portable computers requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC1622CS8#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.
The LTC1622CS8#PBF belongs to Linear's legacy high-efficiency DC/DC controller product line, engineered specifically for battery-powered portable electronics requiring ultra-low input voltage operation, high light-load efficiency, and minimal PCB real estate.
FAQ
What is the minimum input voltage required for the LTC1622CS8#PBF to start switching?
The LTC1622CS8#PBF incorporates an undervoltage lockout (UVLO) that disables operation when VIN falls below 1.92V (typical, ramping down). 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.
Can the LTC1622CS8#PBF drive an N-channel MOSFET instead of a P-channel MOSFET?
No, the LTC1622CS8#PBF is specifically designed to drive external P-channel MOSFETs via its PDRV pin, which swings from 0V to VIN. It lacks a high-side gate driver bootstrap circuit or level-shifting capability required for N-MOSFET high-side configuration. Using an N-MOSFET would require redesigning the power stage and is incompatible with the LTC1622CS8#PBF's control architecture and pin functions.
How does Burst Mode™ operation affect output voltage ripple on the LTC1622CS8#PBF?
Burst Mode™ operation on the LTC1622CS8#PBF reduces switching activity at light loads, causing periodic burst packets of switching cycles followed by idle periods. This increases low-frequency output voltage ripple (typically <10kHz) compared to continuous PWM mode. However, the ripple remains within specification when proper output capacitance (e.g., 47µF POSCAP + 220pF ceramic) and OPTI-LOOP™ compensation are used, as validated in Figure 1b of the datasheet.
What is the purpose of the ITH pin on the LTC1622CS8#PBF, and how is it used in compensation?
The ITH pin on the LTC1622CS8#PBF serves as the error amplifier output and current threshold control node. For compensation, it connects to an OPTI-LOOP™ network (typically a series RC from ITH to GND, plus optional capacitor from ITH to VFB) that shapes the control loop gain and phase margin. This allows stable operation with diverse output capacitors - including low-ESR polymer types - without requiring large ceramic banks, simplifying design and reducing cost.
Is the LTC1622CS8#PBF pin-compatible with other variants like LTC1622IS8#PBF or LTC1622CMS8#PBF?
Yes, the LTC1622CS8#PBF is pin-compatible with LTC1622IS8#PBF (Industrial grade, –45°C to 85°C) and LTC1622CMS8#PBF (MSOP-8 package), sharing identical pinout, function, and electrical behavior across temperature ranges. The 'C' suffix denotes Commercial grade (0°C to 70°C) and SO-8 package; substitution is electrically valid if ambient temperature and package mounting constraints allow.
LTC1622CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (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):
- 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#PBF FAQ
1.How can I place an order for LTC1622CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1622CS8#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 LTC1622CS8#PBF reliable?
The price and inventory of LTC1622CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1622CS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1622CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1622CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1622CS8#PBF?
LTC1622CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1622CS8#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 LTC1622CS8#PBF?
For technical support, including LTC1622CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1622CS8#PBF requirements.
6.How does Aetrix verify that LTC1622CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1622CS8#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 LTC1622CS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1622CS8#PBF?
All LTC1622CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1622CS8#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 LTC1622CS8#PBF part is unused and in its original packaging.
Return procedure for LTC1622CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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