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Analog Devices Inc. LTC1622CMS8#PBF
- Part No.:
- LTC1622CMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1622CMS8#PBF.pdf
- Description:
- IC REG CTRLR BUCK 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:128
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Product details
Overview
LTC1622CMS8#PBF from Analog Devices (formerly Linear Technology) is a low-input-voltage, constant-frequency 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 nominal switching frequency, and supports Burst Mode™ operation for ultra-low quiescent current (350µA) in light-load conditions - ideal for Li-ion–powered portable electronics.
For engineers reviewing the LTC1622CMS8#PBF datasheet, LTC1622CMS8#PBF pinout, LTC1622CMS8#PBF application, or LTC1622CMS8#PBF equivalent, key selection considerations include its 8-lead MSOP package, P-channel MOSFET gate drive capability, OPTI-LOOP™ compensation, undervoltage lockout at 1.92V (typ), and synchronization up to 750kHz - all critical for compact, high-efficiency buck converter designs with tight input voltage margins.
Technical Context
The LTC1622CMS8#PBF implements a current-mode control architecture with an internal 0.8V reference, error amplifier, and peak-current comparator referenced to the SENSE– pin. Its ITH pin serves as the error amplifier output and modulates the current-sense threshold, enabling OPTI-LOOP™ compensation for stable transient response across diverse output capacitor types.
It integrates dual operating modes: continuous conduction mode (CCM) with fixed 550kHz (±15%) oscillator, and selectable Burst Mode™ operation (enabled via SYNC/MODE ≥2V) that reduces switching activity at light loads to maintain >85% efficiency down to 1mA load - while suppressing RF interference through synchronized clock disable during Burst Mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2V to 10V - enables direct regulation from single- or dual-cell Li-ion batteries without pre-regulation. |
| Switching Frequency | 550kHz (typ), adjustable up to 750kHz via SYNC/MODE - permits use of sub-5mm inductors and minimizes output ripple. |
| Reference Voltage | 0.8V ±1.9% - sets precise output voltage via external resistor divider; stable over temperature (±0.005V drift from –45°C to 85°C). |
| Quiescent Current | 350µA (Burst Mode active) - extends battery runtime in standby; drops to 15µA in shutdown. |
| UVLO Threshold | 1.92V (typ, falling edge) - prevents erratic operation below safe Li-ion discharge voltage. |
| Output Accuracy | ±1.9% over line, load, and temperature - ensures reliable system-level voltage margining for 2.5V/1.8V logic rails. |
| Package | 8-Lead MSOP (3mm × 3mm) - provides thermal resistance θJA = 250°C/W for compact, thermally constrained PCB layouts. |
Pinout & Package
Package: 8-lead plastic MSOP (MS8), 3mm × 3mm body, 0.65mm lead pitch, exposed pad (not electrically connected). Thermal performance optimized for surface-mount power delivery on 2-layer boards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE– (1) | Negative current sense input | Connects to low-side of RSENSE; sets peak inductor current threshold with ITH voltage - enables accurate current limiting and CCM stability. |
| ITH (2) | Error amplifier output / compensation node | Controls current comparator threshold; used for OPTI-LOOP™ compensation - determines loop bandwidth and transient response without output capacitor dependency. |
| VFB (3) | Feedback input | Monitors resistive divider output; servo-controlled to 0.8V - defines regulated output voltage as VOUT = 0.8V × (1 + R1/R2). |
| RUN/SS (4) | Soft-start and shutdown control | Internal 2.5µA current source charges CSS for controlled startup; <0.4V forces 15µA shutdown - enables power sequencing and inrush current limiting. |
| SYNC/MODE (5) | Mode selection and sync input | ≥2V enables Burst Mode™; grounded or clocked (625–750kHz) disables Burst Mode and synchronizes switching - eliminates beat frequencies in multi-rail systems. |
| GND (6) | Analog and power ground | Common return for feedback, current sense, and gate drive - must be tied to low-impedance ground plane beneath IC for noise immunity. |
| PDRV (7) | P-channel MOSFET gate driver | 0V to VIN swing, 140ns max fall time - drives logic-level P-MOSFETs with minimal dead-time loss; supports dropout operation (100% duty cycle). |
| VIN (8) | Main power supply input | Accepts 2V–10V; requires local 10µF ceramic decoupling - powers internal circuitry and supplies gate drive energy for external MOSFET. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ Operation | Reduces quiescent current to 350µA and maintains >85% efficiency at 1mA load - extends battery life in intermittent-use devices like wireless modems. |
| OPTI-LOOP™ Compensation | Enables stable loop response with ceramic, POSCAP, or polymer output capacitors - eliminates need for ESR-based compensation networks. |
| Low Dropout (100% Duty Cycle) | Allows VOUT regulation even when VIN ≈ VOUT + VDS(ON) + IOUT×RSENSE - critical for maintaining 2.5V rail during Li-ion discharge to 2.8V. |
| Synchronization Capability | Accepts 625–750kHz TTL/CMOS clock on SYNC/MODE - eliminates switching noise coupling in sensitive RF sections of cellular handsets. |
| Undervoltage Lockout (UVLO) | Shuts down at VIN < 1.92V (typ) - prevents brownout-induced system resets and protects battery from deep discharge. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor and RF transceiver from single-cell Li-ion (2.8V–4.2V). IC Role / Device Role / Timing Role: Primary step-down controller generating stable 2.5V/1.8V rails with fast load transient response. Use Value: Burst Mode™ sustains >90% efficiency at 100µA sleep current; UVLO prevents system crash below 3.0V battery voltage. | Use Scenario: Compact LTE/Wi-Fi module requiring high-efficiency 3.3V rail from 2-cell Li-ion (5.5V–8.4V). IC Role / Device Role / Timing Role: Synchronized buck controller operating at 750kHz to avoid 2.4GHz ISM band interference. Use Value: MSOP-8 footprint saves >30% board area vs SO-8; PDRV drive strength supports low-RDS(ON) P-MOSFETs for <150mV dropout. |
| Portable Computers | Scanners |
Use Scenario: Distributed 1.8V core supply for ARM-based SoC in ultrabook sub-system. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller with OPTI-LOOP™ for robust response to CPU burst loads. Use Value: 550kHz switching allows 2.2µH inductor; ±1.9% VREF ensures memory interface timing margin compliance. | Use Scenario: Battery-powered handheld barcode scanner needing 3.3V rail from 2.5V–6.0V input range. IC Role / Device Role / Timing Role: Low-VIN buck controller supporting wide input range and 100% duty cycle for end-of-battery-life operation. Use Value: RUN/SS soft-start prevents input surge during wake-up; 15µA shutdown current preserves battery for weeks in storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3621EDD#PBF | Monolithic 2A buck regulator (integrated MOSFETs); 3–17V input; no Burst Mode™; 1MHz fixed freq. | Eliminates external MOSFET/diode but lacks UVLO <2V and low-IQ sleep mode. | Choose for simplified layout where input >3V and 350µA IQ is not required. |
| TPS54202DRCT | Integrated 2A buck; 4.5–17V input; Eco-mode™ (similar to Burst Mode™); 500kHz default freq. | Higher minimum VIN excludes single-cell Li-ion; lower accuracy (±2%) and no 100% duty cycle. | Choose for cost-sensitive industrial apps with VIN >4.5V and no deep-discharge operation. |
Compared with LTC1622CMS8#PBF, LTC3621EDD#PBF trades external component flexibility and ultra-low-VIN operation for integration and higher frequency, while TPS54202DRCT offers lower BOM count at the expense of single-cell battery compatibility and precision regulation.
Availability
LTC1622CMS8#PBF 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 LTC1622CMS8#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 full technical and manufacturing continuity for legacy Linear power products.
The LTC1622CMS8#PBF belongs to Linear's precision DC/DC controller family, engineered specifically for high-efficiency, low-input-voltage power conversion in space-constrained portable electronics - emphasizing battery longevity, thermal efficiency, and seamless integration with P-channel MOSFETs.
FAQ
What is the minimum input voltage for reliable operation of the LTC1622CMS8#PBF?
The LTC1622CMS8#PBF has a guaranteed undervoltage lockout (UVLO) threshold of 1.92V (typical) with hysteresis, and begins regulation at VIN ≥2.0V. Below 1.92V, the device shuts down completely, drawing only ~4µA. This makes LTC1622CMS8#PBF uniquely suited for single-cell Li-ion systems operating down to end-of-discharge voltage.
Does the LTC1622CMS8#PBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC1622CMS8#PBF supports true 100% duty cycle (dropout) operation: when VIN approaches VOUT, the PDRV pin remains high continuously, turning the external P-channel MOSFET fully ON. This is achieved by the internal control logic overriding the oscillator when inductor current fails to reach the ITH-set threshold - ensuring uninterrupted output regulation even at VIN = VOUT + VDS(ON) + IOUT×RSENSE. The LTC1622CMS8#PBF datasheet confirms this behavior under "Dropout Operation".
How does Burst Mode™ operation affect electromagnetic interference (EMI) in the LTC1622CMS8#PBF?
Burst Mode™ operation in the LTC1622CMS8#PBF reduces average switching frequency at light loads, which lowers conducted EMI in the 150kHz–1MHz range. However, the device automatically inhibits Burst Mode™ when SYNC/MODE is pulled low or driven by an external clock - enabling deterministic, low-noise operation in RF-sensitive applications. This dual-mode capability makes LTC1622CMS8#PBF suitable for both battery-life-critical and EMI-sensitive designs.
What is the purpose of the ITH pin on the LTC1622CMS8#PBF, and how is it used in compensation?
The ITH pin on the LTC1622CMS8#PBF is the output of the internal error amplifier and directly controls the current-sense threshold for the peak-current comparator. For OPTI-LOOP™ compensation, a series RC network is connected from ITH to GND - setting dominant pole location independent of output capacitor ESR. This allows stable loop response with low-ESR ceramics or polymer caps, unlike traditional Type-II compensation. The LTC1622CMS8#PBF application note details exact component values based on desired crossover frequency and phase margin.
Can the LTC1622CMS8#PBF be synchronized to an external clock, and what are the valid frequency and signal requirements?
Yes, the LTC1622CMS8#PBF can be synchronized to an external TTL/CMOS-compatible clock applied to the SYNC/MODE pin. Valid synchronization range is 625kHz to 750kHz; frequencies below 625kHz may cause abnormal operation. The clock must have ≥100ns pulse width and rise/fall times <20ns. Synchronization is disabled if VFB < 0.3V (e.g., during short-circuit), and Burst Mode™ is automatically deactivated during sync - ensuring predictable timing in multi-rail systems using LTC1622CMS8#PBF.
LTC1622CMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MSOP
LTC1622CMS8#PBF FAQ
1.How can I place an order for LTC1622CMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1622CMS8#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 LTC1622CMS8#PBF reliable?
The price and inventory of LTC1622CMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1622CMS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1622CMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1622CMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1622CMS8#PBF?
LTC1622CMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1622CMS8#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 LTC1622CMS8#PBF?
For technical support, including LTC1622CMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1622CMS8#PBF requirements.
6.How does Aetrix verify that LTC1622CMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1622CMS8#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 LTC1622CMS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1622CMS8#PBF?
All LTC1622CMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1622CMS8#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 LTC1622CMS8#PBF part is unused and in its original packaging.
Return procedure for LTC1622CMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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