My Inquiry
My Account
Analog Devices Inc. LTC1622IS8#TRPBF
- Part No.:
- LTC1622IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1622IS8#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,604
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1622IS8#TRPBF 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) in light-load conditions - ideal for Li-ion–powered portable computers and wireless modems.
For engineers reviewing the LTC1622IS8#TRPBF datasheet, LTC1622IS8#TRPBF pinout, LTC1622IS8#TRPBF application, or LTC1622IS8#TRPBF equivalent, key selection considerations include its 8-lead MSOP package, P-channel MOSFET gate drive capability, undervoltage lockout at 1.92V (typ), OPTI-LOOP™ compensation, and synchronization up to 750kHz - all critical for compact, high-efficiency buck converter designs with tight thermal and PCB area constraints.
Technical Context
The LTC1622IS8#TRPBF implements constant-frequency current-mode control with an internal error amplifier, slope-compensated peak-current sensing, and a 0.8V precision reference. Its ITH pin serves as both error amplifier output and current threshold control, enabling dynamic adjustment of peak inductor current across load and line variations.
It integrates dual-mode operation: standard PWM for stable regulation and selectable Burst Mode™ (enabled via SYNC/MODE ≥2V) that reduces switching activity at light loads to maintain >80% efficiency down to 1mA output current. Synchronization is active only above 625kHz and disabled during short-circuit or low-feedback conditions to ensure safe startup and fault recovery.
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 - permits use of sub-5mm inductors and minimizes output ripple filtering requirements. |
| Reference Voltage | 0.8V ±1.9% (industrial grade) - sets precise output voltage via external resistor divider; supports 1.8V, 2.5V, and 3.3V rails. |
| Quiescent Current | 350µA (Burst Mode active) - extends battery runtime in standby or intermittent-use applications like scanners and modems. |
| Shutdown Current | 15µA (typ) - ensures minimal battery drain when system is powered off. |
| UVLO Threshold | 1.92V (typ, VIN ramping down) - prevents unstable operation and MOSFET stress below safe input voltage. |
| Max Duty Cycle | 100% - maintains regulation in dropout (e.g., VIN ≈ VOUT + losses), critical for battery end-of-discharge operation. |
Pinout & Package
Package: 8-lead MSOP (3mm × 3mm, 0.65mm pitch), thermally enhanced for industrial temperature range (–45°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE– (1) | Negative current sense input | Connects to low-side of external sense resistor; sets peak inductor current threshold with ITH voltage. |
| ITH (2) | Error amplifier output / current limit control | Directly controls comparator trip point; used for 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 shutdown control | Internal 2.5µA current source charges external capacitor for controlled startup; <0.4V forces shutdown (IQ ≈ 15µA). |
| SYNC/MODE (5) | Mode selection and sync input | ≥2V enables Burst Mode; grounded or clock-driven (625–750kHz) disables Burst Mode and forces external synchronization. |
| GND (6) | Power and signal ground | Common return for internal circuitry, gate drive, and current sense; requires low-impedance PCB connection. |
| PDRV (7) | P-channel MOSFET gate driver | Swings from 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 bias and gate drive; must be decoupled locally to GND (Pin 6) with low-ESR ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Reduces switching frequency at light loads to maintain >85% efficiency at 10mA output, extending battery life in portable equipment. |
| OPTI-LOOP™ compensation | Allows stable transient response with wide range of output capacitors (including low-ESR POSCAP/OS-CON), minimizing need for iterative loop tuning. |
| 100% duty cycle dropout mode | Enables continuous regulation as VIN approaches VOUT - essential for maintaining 3.3V rail during Li-ion discharge from 4.2V to 2.7V. |
| Synchronization up to 750kHz | Eliminates beat frequencies in multi-rail systems and allows EMI optimization by aligning switching edges with system clocks. |
| Undervoltage lockout (UVLO) | Shuts down controller below 1.92V (typ) to prevent erratic gate drive and MOSFET conduction in brownout conditions. |
Applications
| Portable Computing Power | Wireless Modem DC/DC |
|---|---|
Use Scenario: Powering 2.5V core logic and I/O rails in handheld PCs and tablets operating from 1–2 cell Li-ion batteries. IC Role / Device Role / Timing Role: Primary step-down controller regulating stable 2.5V/1.5A output using external P-MOSFET and synchronous rectification. Use Value: Delivers >90% efficiency at full load and >80% at 10mA via Burst Mode™, directly extending usable battery runtime between charges. | Use Scenario: Generating clean 3.3V supply for RF transceivers and baseband processors in cellular data modems. IC Role / Device Role / Timing Role: High-frequency (550kHz) current-mode controller driving low-RDS(ON) P-MOSFET to minimize size and EMI in compact modem modules. Use Value: Synchronization capability eliminates interference with RF bands; 100% duty cycle ensures uninterrupted operation during battery voltage sag. |
| Industrial Scanner Power | Distributed Low-Voltage Systems |
Use Scenario: Providing regulated 1.8V supply for CMOS image sensors and ADCs in battery-operated barcode scanners. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current buck controller with soft-start to prevent sensor reset during power-up. Use Value: 350µA quiescent current and 15µA shutdown current enable multi-week standby without battery replacement. | Use Scenario: Local point-of-load regulation of 3.3V, 2.5V, or 1.8V rails from a shared 5V or 12V intermediate bus in distributed embedded systems. IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC controller in MSOP package enabling dense board layouts with minimal thermal derating. Use Value: Industrial-grade temperature rating (–45°C to +85°C) and 250°C/W θJA ensure reliable operation in unventilated enclosures. |
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, includes integrated bootstrap diode; no Burst Mode™, higher IQ (1.5mA). | Better suited for wide-input industrial supplies; not optimized for sub-3V battery start-up or ultra-low-IQ portable use. | Select LTC3866EMSE#PBF only if input exceeds 10V or N-MOSFET topology is required; not drop-in for LTC1622IS8#TRPBF. |
| TPS54202DRCT | Integrated N-MOSFETs (2A), 4.5–17V VIN, 500kHz fixed freq, 36µA IQ in Eco-mode; no 100% duty cycle, no UVLO below 4.3V. | Targeted at mid-range input applications; lacks low-VIN capability and true dropout mode needed for Li-ion end-of-discharge. | Choose TPS54202DRCT for cost-sensitive, medium-VIN designs where integration outweighs low-VIN performance; verify VOUT stability below 3V. |
Compared with LTC3866EMSE#PBF and TPS54202DRCT, the LTC1622IS8#TRPBF uniquely combines sub-2.5V start-up, 100% duty cycle, and 350µA Burst Mode™ IQ - making it irreplaceable in space-constrained, single/dual-cell Li-ion systems requiring sustained regulation down to battery cutoff.
Availability
LTC1622IS8#TRPBF is available at Aetrix Electronics and suitable for portable computing, wireless modem, industrial scanner, and distributed low-voltage power systems requiring stable component supply, long-term lifecycle support, and industrial temperature qualification.
Supply support for LTC1622IS8#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1622IS8#TRPBF belongs to Linear's legacy high-efficiency DC/DC controller product line, engineered specifically for battery-powered portable electronics demanding ultra-low quiescent current, wide input range, and compact footprint.
FAQ
What is the minimum input voltage required for the LTC1622IS8#TRPBF to start switching?
The LTC1622IS8#TRPBF begins operation when VIN exceeds its undervoltage lockout (UVLO) turn-on threshold of 1.97V (typ, VIN ramping up). Below this voltage, the device remains in shutdown with only ~4µA supply current. Stable regulation is maintained down to 2V input, and the controller supports 100% duty cycle to sustain output as VIN drops toward VOUT - a key feature for Li-ion battery applications where voltage declines from 4.2V to 2.7V.
Does the LTC1622IS8#TRPBF support synchronization to an external clock, and what is the valid frequency range?
Yes, the LTC1622IS8#TRPBF supports external synchronization via the SYNC/MODE pin (Pin 5). An external TTL/CMOS-compatible clock signal between 625kHz and 750kHz forces the controller to operate at that exact frequency. Synchronization is inhibited below 625kHz to prevent abnormal operation and undesired spectral content. Note that Burst Mode™ is automatically disabled during synchronization, and the clock pulse width must be ≥100ns and ≤ period – 200ns.
How does Burst Mode™ operation improve efficiency in the LTC1622IS8#TRPBF, and when is it active?
Burst Mode™ in the LTC1622IS8#TRPBF improves light-load efficiency by reducing switching frequency and gate drive activity. It activates automatically when the SYNC/MODE pin is left open or pulled to ≥2V, causing the controller to enter sleep mode (PDRV off) when ITH falls below 0.12V and resume switching when ITH rises above 0.22V. This reduces quiescent current to 350µA and maintains >80% efficiency at 10mA output - critical for extending battery life in intermittently active devices like scanners and modems.
What is the function of the ITH pin on the LTC1622IS8#TRPBF, and how is it used in compensation?
The ITH pin (Pin 2) on the LTC1622IS8#TRPBF is the output of the internal error amplifier and directly controls the current comparator threshold. It serves dual roles: setting peak inductor current (via VITH = 10 × VSENSE) and enabling OPTI-LOOP™ compensation. A Type II or Type III network (resistor + capacitor + optional zero) is connected from ITH to GND and/or VFB to stabilize the control loop across varying output capacitance and ESR - allowing robust transient response without redesign when changing from ceramic to polymer capacitors.
Can the LTC1622IS8#TRPBF drive an N-channel MOSFET instead of a P-channel MOSFET?
No, the LTC1622IS8#TRPBF is specifically designed to drive external P-channel MOSFETs via its high-side gate driver (PDRV pin), which swings from 0V to VIN. It lacks a bootstrap circuit or floating high-side driver required for N-MOSFET high-side configuration. Attempting to use an N-MOSFET would result in improper gate biasing and failure to conduct. For N-MOSFET compatibility, consider alternatives such as the LTC3866 or TPS54202 - but those require different layout, feedback, and protection schemes versus the LTC1622IS8#TRPBF.
LTC1622IS8#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:
- -45°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1622IS8#TRPBF FAQ
1.How can I place an order for LTC1622IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1622IS8#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 LTC1622IS8#TRPBF reliable?
The price and inventory of LTC1622IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1622IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1622IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1622IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1622IS8#TRPBF?
LTC1622IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1622IS8#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 LTC1622IS8#TRPBF?
For technical support, including LTC1622IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1622IS8#TRPBF requirements.
6.How does Aetrix verify that LTC1622IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1622IS8#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 LTC1622IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1622IS8#TRPBF?
All LTC1622IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1622IS8#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 LTC1622IS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1622IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1622IS8#TRPBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
