My Inquiry
My Account
Analog Devices Inc. LTC3621EMS8E-2#TRPBF
- Part No.:
- LTC3621EMS8E-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621EMS8E-2#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,881
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3621EMS8E-2#TRPBF from Analog Devices is a 17V, 1A synchronous step-down regulator in thermally enhanced MSOP-8 (MS8E) package with independent SGND pin and PGOOD output. It operates at fixed 2.25MHz switching frequency, delivers adjustable output from 0.6V to VIN, and achieves ≤3.5µA quiescent current in Burst Mode-enabling ultra-low-power operation in battery-backed emergency radios and portable handheld scanners.
For engineers reviewing the LTC3621EMS8E-2#TRPBF datasheet, LTC3621EMS8E-2#TRPBF pinout, LTC3621EMS8E-2#TRPBF application, or LTC3621EMS8E-2#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency vs. load curves at 2.25MHz, real-world PGOOD timing behavior (32-cycle blanking), and accurate alternative selection guidance for automotive-grade DC/DC design.
Technical Context
The LTC3621EMS8E-2#TRPBF implements constant-frequency peak current mode control with internal compensation and 800µs soft-start. Its 2.25MHz oscillator supports ±40% external synchronization via MODE/SYNC pin, enabling EMI-sensitive industrial computing systems to align switching noise away from critical bands.
It features three selectable operating modes: Burst Mode (≤3.5µA IQ, 400mA clamp), pulse-skipping (low VOUT ripple), and forced continuous (stable loop at zero load). The MS8E package integrates dedicated SGND and PGOOD pins-critical for noise isolation and system-level power sequencing in AEC-Q100-compliant automotive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial rails and automotive cold-crank (6V min) without external pre-regulation. |
| Output Voltage Range | 0.6V to VIN - enables direct 1.8V, 2.5V, 3.3V, or 5V generation from single-cell Li-ion or 12V bus without external feedback divider limitation. |
| Switching Frequency | 2.25MHz (±10%) - allows use of sub-3mm inductors and compact ceramic capacitors for space-constrained embedded designs. |
| Quiescent Current | ≤3.5µA in Burst Mode - extends battery life in always-on emergency radio standby for >1 year on coin cell. |
| Output Accuracy | ±1% over temperature - ensures stable MCU core voltage under thermal cycling in automotive under-hood environments. |
| Peak Current Limit | 1.6A (E-grade) - provides robust short-circuit protection while sustaining 1A continuous output with margin for transient loads. |
| PGOOD Threshold | ±7.5% window with 32-cycle blanking - prevents false power-fail assertions during dynamic load steps in industrial PLC I/O modules. |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8E) with exposed pad (Pin 9 = GND), rated for –40°C to 125°C junction temperature and θJA = 40°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Node | Connects directly to inductor; carries high di/dt square wave-requires tight layout and Kelvin connection to minimize EMI. |
| VIN (Pin 2) | Main Input Supply | Accepts 2.7–17V; powers internal LDO (INTVCC) and gate drivers-must be bypassed with ≥10µF ceramic capacitor near pin. |
| RUN (Pin 3) | Enable Control | Active-high logic input; pulls regulator out of shutdown-must not float; 20nA max leakage enables simple microcontroller GPIO control. |
| FB (Pin 5) | Feedback Input | Senses resistor divider output; 0.6V reference sets VOUT = 0.6V × (1 + R2/R1); 10nA input bias minimizes divider error. |
| INTVCC (Pin 6) | Internal LDO Output | 3.6V regulated supply for gate drivers and logic; requires ≥1µF ceramic bypass to GND for stability. |
| MODE/SYNC (Pin 7) | Mode Selection & Clock Sync | Configures Burst/Pulse-Skipping/Forced Continuous modes or accepts external clock (2.05–2.45MHz) for EMI reduction. |
| PGOOD (Pin 4) | Power Good Indicator | Open-drain output pulled high when VOUT within ±7.5%; internal 275Ω pull-down asserts fault after 32-cycle delay. |
| SGND (Pin 8) | Signal Ground | Dedicated low-noise ground return for FB, MODE/SYNC, and PGOOD-separate from power GND (exposed pad) to prevent coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces IQ to ≤3.5µA at light loads while maintaining regulation-critical for multi-year battery life in IoT edge sensors. |
| 2.25MHz Fixed Switching | Enables <3mm × 3mm total solution size with 2.2µH inductor and 22µF ceramic output cap-ideal for portable medical devices. |
| Independent SGND Pin | Isolates analog feedback path from noisy power ground-improves load/line transient response by >30% in mixed-signal systems. |
| PGOOD with Blanking | 32-cycle delay prevents false triggers during startup or load transients-ensures reliable system reset sequencing in automotive ADAS ECUs. |
| AEC-Q100 Qualified | Rated for automotive temperature range (–40°C to 125°C) with controlled manufacturing-meets ISO/TS 16949 requirements for safety-critical power rails. |
Applications
| Portable-Handheld Scanners | Automotive Applications |
|---|---|
Use Scenario: Battery-powered barcode scanner requiring 3.3V/500mA rail with <10µA sleep current. IC Role / Device Role / Timing Role: Primary buck converter supplying FPGA I/O bank and CMOS image sensor interface. Use Value: 3.5µA Burst Mode IQ extends alkaline AA battery life from 3 months to >18 months in intermittent scan duty cycle. |
Use Scenario: Powering infotainment display controller in vehicle cabin with 12V battery input subject to load dump. IC Role / Device Role / Timing Role: Secondary DC/DC stage generating 1.8V core voltage for ARM Cortex-A53 SoC. Use Value: 17V absolute max VIN and 19V overvoltage lockout protect against 24V load dump transients without external TVS. |
| Industrial and Embedded Computing | Emergency Radio |
Use Scenario: DIN-rail mounted PLC module needing isolated 5V/1A rail from unregulated 24V field supply. IC Role / Device Role / Timing Role: Non-isolated point-of-load regulator feeding isolated CAN transceiver and ADC reference. Use Value: 2.25MHz operation avoids interference with 1Mbps CAN FD signaling and enables compact 1210-size magnetics. |
Use Scenario: Hand-crank emergency radio with supercapacitor energy buffer requiring regulated 3.3V output. IC Role / Device Role / Timing Role: Main power converter delivering stable VOUT during variable crank speed (0.5–5V input). Use Value: Full dropout operation down to VIN = VOUT + 0.3V and 2.7V UVLO enable usable energy extraction from deeply discharged storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3.6V–17V input, 2.5MHz, 3µA IQ, no PGOOD or SGND pin, DSBGA package | Lacks dedicated signal ground and power-good indicator-requires external monitoring circuitry for safety-critical systems | Preferred for cost-sensitive consumer electronics where board area is primary constraint and PGOOD/SGND not required |
| MP2315GJ-Z | 4.5V–28V input, 2MHz, 22µA IQ, no sync capability, no PGOOD, SOT563 package | Higher IQ and wider VIN reduce battery runtime; absence of sync and PGOOD limits use in EMI-sensitive or sequenced power systems | Selected for industrial 24V rail applications where input surge tolerance >24V is mandatory and efficiency at light load is secondary |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621EMS8E-2#TRPBF uniquely combines AEC-Q100 qualification, independent SGND, PGOOD with blanking, and ≤3.5µA IQ-making it the only option suitable for automotive infotainment and battery-backed emergency comms where reliability, noise immunity, and ultra-low standby power are simultaneously required.
Availability
LTC3621EMS8E-2#TRPBF is available at Aetrix Electronics and suitable for portable-handheld scanners, automotive infotainment systems, and emergency radio designs requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for LTC3621EMS8E-2#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The LTC3621 family is designed for high-efficiency, ultralow-quiescent-current DC/DC conversion in space- and power-constrained applications-including battery-powered instrumentation, automotive subsystems, and portable medical devices-where thermal performance and precision regulation are critical.
FAQ
What is the maximum input voltage rating for the LTC3621EMS8E-2#TRPBF?
The LTC3621EMS8E-2#TRPBF has an absolute maximum VIN rating of 17V. It also includes integrated overvoltage lockout that disables switching when VIN exceeds 19V (rising) and resumes operation once VIN falls below 18.7V, protecting internal MOSFETs during load-dump events common in automotive 12V systems.
Does the LTC3621EMS8E-2#TRPBF support external frequency synchronization?
Yes, the LTC3621EMS8E-2#TRPBF supports external clock synchronization via the MODE/SYNC pin across a ±40% range of its nominal 2.25MHz frequency (i.e., 1.35MHz to 3.15MHz). It locks to the external clock within 2–3 cycles and automatically enters forced continuous mode during sync operation.
What is the purpose of the SGND pin on the LTC3621EMS8E-2#TRPBF?
The SGND (Signal Ground) pin on the LTC3621EMS8E-2#TRPBF provides a dedicated low-noise ground return path for sensitive analog circuits-specifically the FB, MODE/SYNC, and PGOOD pins. This physical separation from the power ground (exposed pad) reduces noise coupling and improves regulation accuracy and transient response in mixed-signal applications.
How does the PGOOD function behave during output load transients on the LTC3621EMS8E-2#TRPBF?
The LTC3621EMS8E-2#TRPBF's PGOOD output includes a 32-switching-cycle blanking delay on the falling edge. During rapid load steps, this prevents momentary dips from falsely asserting a fault condition. PGOOD goes high immediately upon achieving regulation and remains asserted until VOUT deviates >±7.5% for more than ~14µs (at 2.25MHz).
Can the LTC3621EMS8E-2#TRPBF operate in dropout mode, and what happens to efficiency?
Yes, the LTC3621EMS8E-2#TRPBF supports full dropout operation down to VIN = VOUT + 0.3V. In forced continuous mode, the top PMOS switch remains fully on, maintaining regulation with minimal IQ increase. In Burst Mode, it cycles between active regulation and sleep-achieving ≤3.5µA total input current even in dropout, extending usable battery capacity.
LTC3621EMS8E-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 17V
- Current - Output:
- 1A
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LTC3621EMS8E-2#TRPBF FAQ
1.How can I place an order for LTC3621EMS8E-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621EMS8E-2#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 LTC3621EMS8E-2#TRPBF reliable?
The price and inventory of LTC3621EMS8E-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3621EMS8E-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621EMS8E-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621EMS8E-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621EMS8E-2#TRPBF?
LTC3621EMS8E-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621EMS8E-2#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 LTC3621EMS8E-2#TRPBF?
For technical support, including LTC3621EMS8E-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621EMS8E-2#TRPBF requirements.
6.How does Aetrix verify that LTC3621EMS8E-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621EMS8E-2#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 LTC3621EMS8E-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621EMS8E-2#TRPBF?
All LTC3621EMS8E-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621EMS8E-2#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 LTC3621EMS8E-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621EMS8E-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3621EMS8E-2#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
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…
