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Analog Devices Inc. LTC1622CMS8#TRPBF
- Part No.:
- LTC1622CMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1622CMS8#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,548
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Product details
Overview
LTC1622CMS8#TRPBF 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, and features Burst Mode™ operation for high light-load efficiency. It is used in Li-ion–powered portable computers and wireless modems requiring stable 2.5V/3.3V/1.8V distributed rails.
For engineers reviewing the LTC1622CMS8#TRPBF datasheet, LTC1622CMS8#TRPBF pinout, LTC1622CMS8#TRPBF application, or LTC1622CMS8#TRPBF equivalent, key selection considerations include its 550kHz fixed switching frequency, 8-lead MSOP package, 350µA quiescent current, 100% duty-cycle dropout capability, and SYNC/MODE pin–controlled Burst Mode vs. synchronization behavior.
Technical Context
The LTC1622CMS8#TRPBF implements a current-mode control architecture with an internal 0.8V reference, error amplifier (ITH pin), and peak-current comparator referenced to SENSE–. Its oscillator operates at 550kHz (typ.) and is synchronizable up to 750kHz via the SYNC/MODE pin - but only when feedback voltage exceeds 0.3V.
Burst Mode™ operation is enabled by leaving SYNC/MODE open or applying ≥2V, reducing switching activity at light loads to maintain >80% efficiency down to 1mA load. During Burst Mode, the ITH pin threshold drops to ~0.36V, and sleep logic disables PDRV when ITH falls below 0.12V, resuming at 0.22V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2V to 10V - supports single/dual-cell Li-ion inputs without external LDO pre-regulation. |
| fOSC (Typ.) | 550kHz - enables use of compact 4.7µH inductors and reduces output capacitor ESR requirements. |
| VFB Accuracy | ±1.9% over temperature - ensures tight output regulation across 0°C to 70°C commercial range. |
| IQ (Sleep) | 350µA - minimizes standby power loss in always-on portable subsystems. |
| Shutdown IQ | 15µA - extends shelf life and battery storage time in powered-off states. |
| UVLO Threshold | 1.92V (typ., falling) - prevents erratic operation during battery depletion while allowing full utilization down to ~2.0V. |
| Max Duty Cycle | 100% - maintains regulated output during input voltage sag (e.g., Li-ion discharge to 2.5V). |
Pinout & Package
Package: 8-lead MSOP (3mm × 3mm, 0.65mm pitch), moisture sensitivity level 1, rated for 0°C to 70°C operation.
| 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. |
| ITH (2) | Error amplifier output / compensation node | Controls current-comparator threshold; OPTI-LOOP™ compensation applied here for stability. |
| VFB (3) | Feedback input | Monitors resistive divider output; servo-controlled to 0.8V reference for output regulation. |
| RUN/SS (4) | Soft-start and shutdown control | 0.7V threshold enables operation; <0.4V forces 15µA shutdown; internal 2.5µA current source ramps soft-start. |
| SYNC/MODE (5) | Mode selection and sync input | ≥2V enables Burst Mode™; TTL/CMOS clock (625–750kHz) forces synchronization; floating = Burst Mode active. |
| GND (6) | Analog and power ground | Common return for feedback, sense, and gate drive; requires low-impedance PCB connection. |
| PDRV (7) | P-channel MOSFET gate driver | Swings 0V to VIN; drives external high-side PMOS switch with 80ns rise/100ns fall time (3000pF load). |
| VIN (8) | Main power supply input | Supplies internal circuitry and PDRV; must be decoupled locally to GND (Pin 6) with low-ESR ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control | Provides inherent cycle-by-cycle current limiting and superior transient response to line/load changes. |
| Burst Mode™ operation | Reduces quiescent current to 350µA and maintains >80% efficiency at 1mA load, extending battery runtime. |
| OPTI-LOOP™ compensation | Allows stable loop response with wide variety of output capacitors (e.g., POSCAP, OS-CON, ceramic) without redesign. |
| 100% duty-cycle dropout | Enables continuous regulation as VIN approaches VOUT - critical for deep-discharge Li-ion applications. |
| Synchronization up to 750kHz | Eliminates beat frequencies in multi-rail systems and allows EMI optimization via fixed-frequency coordination. |
Applications
| Portable Computing Power Rails | Wireless Modem Core Supply |
|---|---|
|
Use Scenario: Generating 1.8V/2.5V core voltage for ARM-based application processors in ultra-thin notebooks. IC Role / Device Role / Timing Role: Primary step-down controller regulating tightly-toleranced CPU I/O and memory interface rails. Use Value: 550kHz switching enables small 4.7µH inductor and 10µF ceramic input cap, minimizing board area in space-constrained designs. |
Use Scenario: Providing 3.3V bias to RF transceivers and baseband ICs in LTE/Wi-Fi modules with intermittent traffic. IC Role / Device Role / Timing Role: High-efficiency DC/DC controller managing dynamic load steps from idle (100µA) to transmit burst (1.2A). Use Value: Burst Mode™ maintains >85% efficiency at 100µA load, directly extending module battery life between data transmissions. |
| Li-ion–Powered Cellular Handsets | Distributed 3.3V Systems in Industrial Sensors |
|
Use Scenario: Regulating 2.5V for camera ISP and display interface in dual-cell Li-ion smartphones. IC Role / Device Role / Timing Role: Secondary buck controller operating from main PMIC rail or direct battery input. Use Value: 2V UVLO threshold permits full utilization of Li-ion cell down to 2.0V, adding ~5% usable capacity versus 2.5V-lockout alternatives. |
Use Scenario: Local point-of-load conversion from 5V/12V backplane to 3.3V for microcontroller and analog front-end in field-deployed sensors. IC Role / Device Role / Timing Role: Standalone controller enabling isolated, low-noise 3.3V domain with minimal external components. Use Value: 15µA shutdown current ensures negligible drain during sensor sleep cycles, supporting 10+ year battery life in remote deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54202DRTT | Integrated 2A FET; 4.5–17V VIN; no Burst Mode; 500kHz fixed freq; requires external compensation. | Higher VIN range suits 5V/12V systems; lacks low-VIN (<2.5V) capability and ultra-low-IQ sleep mode. | Choose for higher-input industrial rails where integration outweighs low-VIN need. |
| MAX17504ATP+ | 4.5–60V VIN; integrated 3.5A FET; current-mode; 100kHz–2.2MHz adjustable freq; no Burst Mode. | Designed for wide-VIN industrial/motor control; not suitable for sub-2.5V battery inputs or µA-level shutdown. | Prefer for high-VIN, high-current applications where LTC1622CMS8#TRPBF's low-VIN operation is unnecessary. |
Compared with TPS54202DRTT and MAX17504ATP+, the LTC1622CMS8#TRPBF uniquely supports 2V–10V input with 350µA sleep current and 15µA shutdown - making it irreplaceable in single/dual-cell Li-ion portable systems demanding extended runtime and deep discharge tolerance.
Availability
LTC1622CMS8#TRPBF is available at Aetrix Electronics and suitable for portable computing power rails, wireless modem core supplies, Li-ion–powered cellular handsets, distributed 3.3V systems in industrial sensors, and battery-powered medical monitors requiring stable component supply and long-lifecycle support.
Supply support for LTC1622CMS8#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 full technical and manufacturing continuity for all Linear power products.
The LTC1622CMS8#TRPBF belongs to Linear's precision current-mode DC/DC controller family, engineered specifically for high-efficiency, low-input-voltage battery regulation in portable and space-constrained applications.
FAQ
What is the minimum input voltage required for LTC1622CMS8#TRPBF to operate?
The LTC1622CMS8#TRPBF has an undervoltage lockout (UVLO) threshold of 1.92V (typical, falling). It begins normal operation when VIN rises above ~1.97V and shuts down cleanly below 1.92V. This allows full utilization of Li-ion cells down to 2.0V, delivering measurable runtime extension versus controllers with 2.5V or higher UVLO.
Does LTC1622CMS8#TRPBF integrate power MOSFETs?
No, the LTC1622CMS8#TRPBF is a controller-only IC and requires an external P-channel MOSFET for the high-side switch. Its PDRV pin provides gate drive capable of swinging from 0V to VIN with 80ns rise/100ns fall into 3000pF, optimized for logic-level PMOS devices with RDS(ON) < 50mΩ.
How does Burst Mode™ operation affect noise and EMI in LTC1622CMS8#TRPBF designs?
Burst Mode™ reduces switching activity at light loads, lowering average switching frequency and associated conducted EMI. However, it introduces low-frequency envelope modulation. To minimize noise, LTC1622CMS8#TRPBF inhibits Burst Mode when SYNC/MODE is pulled low or driven with an external clock - enabling fixed-frequency operation for EMI-sensitive RF sections.
Can LTC1622CMS8#TRPBF be synchronized to frequencies below 625kHz?
No - the LTC1622CMS8#TRPBF specification explicitly prohibits synchronization below 625kHz. Attempting to drive SYNC/MODE with a clock <625kHz may cause abnormal operation, unstable frequency, or unintended Burst Mode activation. The valid sync range is strictly 625kHz to 750kHz, aligned to its internal oscillator's upper limit.
What is the purpose of the ITH pin on LTC1622CMS8#TRPBF, and how is it used?
The ITH pin on LTC1622CMS8#TRPBF is the error amplifier output and primary compensation node. It sets the current-comparator threshold and is used for OPTI-LOOP™ compensation - connecting RC networks here tailors loop stability across diverse output capacitor types (e.g., POSCAP, ceramic, polymer) without requiring redesign for different COUT selections.
LTC1622CMS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MSOP
LTC1622CMS8#TRPBF FAQ
1.How can I place an order for LTC1622CMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1622CMS8#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 LTC1622CMS8#TRPBF reliable?
The price and inventory of LTC1622CMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1622CMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1622CMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1622CMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1622CMS8#TRPBF?
LTC1622CMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1622CMS8#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 LTC1622CMS8#TRPBF?
For technical support, including LTC1622CMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1622CMS8#TRPBF requirements.
6.How does Aetrix verify that LTC1622CMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1622CMS8#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 LTC1622CMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1622CMS8#TRPBF?
All LTC1622CMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1622CMS8#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 LTC1622CMS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1622CMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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