My Inquiry
My Account
Analog Devices Inc. LTC3621HMS8E#PBF
- Part No.:
- LTC3621HMS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621HMS8E#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:103
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3621HMS8E#PBF 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 from 2.7V–17V input, delivers adjustable 0.6V–VIN output, features 2.25MHz fixed switching frequency, ±40% sync range, and 3.5µA quiescent current - ideal for automotive emergency radios requiring high efficiency at light loads.
For engineers reviewing the LTC3621HMS8E#PBF datasheet, LTC3621HMS8E#PBF pinout, LTC3621HMS8E#PBF application, or LTC3621HMS8E#PBF equivalent, key selection criteria include its H-grade (–40°C to 150°C) junction rating, Burst Mode®/pulse-skipping mode flexibility, internal compensation, and MS8E-specific SGND/PGOOD functionality not available in DFN variants.
Technical Context
The LTC3621HMS8E#PBF uses constant-frequency peak current mode control with internal slope compensation, enabling stable operation up to 100% duty cycle in dropout. Its MODE/SYNC pin supports three operating modes: Burst Mode (≤3.5µA IQ), pulse-skipping (low VOUT ripple), and forced continuous (fixed 2.25MHz), all selectable via external voltage level.
It integrates dual MOSFETs (top PMOS RDS(ON) = 0.37Ω, bottom NMOS RDS(ON) = 0.15Ω at VIN = 5V), 0.6V reference with ±1% accuracy over temperature, and dedicated PGOOD with ±7.5% window and 32-cycle blanking delay - all implemented in an MS8E package with exposed thermal pad and isolated SGND for noise-sensitive feedback paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and automotive battery systems including cold-crank (≥2.7V) and load-dump transient resilience. |
| Output Voltage Range | 0.6V to VIN - enables direct regulation from 3.3V/5V rails down to core logic voltages without external LDO post-regulation. |
| Switching Frequency | 2.25MHz (±40% sync range) - allows compact 2.2µH inductors and ceramic capacitors, reducing solution size vs 1MHz variants. |
| 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 –40°C to 150°C - ensures reliable microcontroller core voltage regulation across full automotive temperature envelope. |
| Peak Current Limit | 1.30A (H-grade min) - provides robust short-circuit protection while maintaining 1A continuous output under thermal derating. |
| Thermal Rating | Junction temp rated to 150°C - validated for under-hood automotive use with θJA = 40°C/W and exposed pad soldered to PCB ground. |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8E) with exposed thermal pad (Pin 9 = GND), featuring isolated Signal Ground (SGND, Pin 8) and Power Good (PGOOD, Pin 4) - optimized for low-noise feedback and system-level power sequencing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Node | Connection to inductor; carries high di/dt square wave - requires tight layout and Kelvin return to minimize EMI and voltage overshoot. |
| VIN (Pin 2) | Main Input Supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and high-side gate driver - bypass with ≥10µF ceramic close to pin. |
| RUN (Pin 3) | Enable Control | Active-high logic input; <0.3V disables regulator, >1.0V enables - must not float; internal pull-down ensures safe default-off state. |
| PGOOD (Pin 4) | Power Good Indicator | Open-drain output pulled high externally; asserts high when VOUT within ±7.5% of setpoint - used for processor reset or power sequencing. |
| FB (Pin 5) | Feedback Input | Senses resistor divider output; regulates VOUT = 0.6V × (1 + R2/R1); 10nA input bias enables high-impedance dividers for low IQ. |
| INTVCC (Pin 6) | Internal LDO Output | 3.6V regulated supply for gate drivers and analog circuitry - bypass with ≥1µF ceramic to GND for stability and noise rejection. |
| MODE/SYNC (Pin 7) | Operating Mode Select | Configures Burst Mode (tie to INTVCC), pulse-skipping (tie to GND), or forced continuous/sync (apply 1V–VINTVCC–1.2V). |
| SGND (Pin 8) | Signal Ground Reference | Dedicated low-noise ground for FB, INTVCC, and MODE/SYNC - must be routed separately from power GND to avoid coupling noise into feedback path. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces IQ to 3.5µA at light loads while maintaining regulation - critical for battery-powered emergency radios with multi-year standby. |
| 2.25MHz Fixed Switching | Enables use of small 2.2µH inductors and 10–22µF ceramic output caps - cuts solution footprint by >40% vs 1MHz alternatives. |
| H-Grade Temperature Range | –40°C to 150°C junction rating - qualified per AEC-Q100 for under-hood automotive applications without derating. |
| Independent SGND Pin | Isolates analog ground return for FB/INTVCC/MODE - prevents switching noise from corrupting feedback and improving load transient response. |
| PGOOD with Blanking Delay | 32-cycle blanking prevents false trips during startup or load transients - ensures reliable system reset signaling in safety-critical devices. |
| Internal Compensation | Eliminates need for external compensation network - reduces BOM count and design iteration time for standard buck configurations. |
Applications
| Automotive Emergency Radio | Industrial Handheld Scanner |
|---|---|
Use Scenario: Powers microcontroller, RF transceiver, and audio amplifier in vehicle-mounted emergency broadcast receiver operating from 9–16V battery with cold-crank capability. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering 3.3V/1A with ultra-low IQ to extend battery backup runtime during main power loss. Use Value: 3.5µA quiescent current enables >18-month coin-cell backup; 150°C rating ensures reliability near engine compartment heat sources. |
Use Scenario: Supplies 1.2V core and 3.3V I/O rails for ARM-based barcode scanner in factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Adjustable buck regulator supporting multiple voltage domains from single 5V or 12V intermediate rail. Use Value: 2.25MHz operation allows miniature 2.2µH shielded inductor; MS8E package with SGND minimizes noise coupling into sensitive image sensor analog front-end. |
| Portable Medical Monitor | Embedded Telematics Unit |
Use Scenario: Powers low-power MCU and OLED display in battery-operated patient vital sign monitor requiring FDA-compliant long-term reliability. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator delivering 1.8V/500mA from Li-ion battery (3.0–4.2V) with precise voltage accuracy. Use Value: ±1% output accuracy over –40°C to 150°C ensures consistent ADC reference and display brightness; zero-current shutdown eliminates battery drain during storage. |
Use Scenario: Provides 5V/1A for CAN transceiver and 3.3V/800mA for cellular modem in vehicle telematics gateway exposed to under-dash thermal cycling. IC Role / Device Role / Timing Role: Dual-output capable buck (via resistor divider tuning) with PGOOD sequencing for modem power-up and CAN bus initialization. Use Value: PGOOD with 32-cycle blanking prevents false resets during ignition transients; H-grade rating avoids thermal throttling in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3621IMS8E#PBF | I-grade (–40°C to 125°C), same pinout and electrical specs except lower max junction temperature and reduced ILIM (1.44A min). | Suitable for non-automotive industrial applications where ambient temperature stays below 105°C. | Select when cost sensitivity outweighs extended temperature requirement and thermal margin is sufficient. |
| TPS62130ARGTR | 3.0V–17V input, 3A output, 2.25MHz, but no PGOOD, no SGND, and only 125°C max junction rating. | Lacks PGOOD and isolated SGND - unsuitable for safety-critical automotive sequencing or noise-sensitive analog loads. | Consider only for space-constrained consumer applications where PGOOD and signal integrity are non-critical. |
Compared with LTC3621IMS8E#PBF, the LTC3621HMS8E#PBF adds 25°C higher junction rating and tighter current limit spec for automotive reliability; versus TPS62130ARGTR, it provides essential automotive-grade features - PGOOD, SGND, and AEC-Q100 alignment - at the cost of lower output current.
Availability
LTC3621HMS8E#PBF is available at Aetrix Electronics and suitable for automotive emergency radios, industrial handheld scanners, portable medical monitors, and embedded telematics units requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3621HMS8E#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and automotive markets since 1965.
The LTC3621HMS8E#PBF belongs to Analog Devices' Power by Linear™ family of high-efficiency DC/DC regulators designed specifically for automotive and industrial applications demanding ultra-low IQ, wide VIN, and AEC-Q100 compliance.
FAQ
What is the maximum junction temperature rating for LTC3621HMS8E#PBF?
The LTC3621HMS8E#PBF is rated for operation up to 150°C junction temperature, verified per AEC-Q100 stress testing. This H-grade specification enables deployment in under-hood automotive locations where ambient temperatures exceed 105°C, provided the PCB thermal design maintains θJA ≤ 40°C/W with exposed pad soldered to solid ground plane.
Does LTC3621HMS8E#PBF support external clock synchronization?
Yes, the LTC3621HMS8E#PBF supports external clock synchronization via its MODE/SYNC pin, with a capture range of ±40% around its nominal 2.25MHz frequency. When an external clock is applied, the device enters forced continuous mode and locks to the external frequency within 2–3 cycles - useful for EMI reduction in noise-sensitive systems.
How does the SGND pin on LTC3621HMS8E#PBF improve system performance?
The SGND pin on LTC3621HMS8E#PBF provides a dedicated low-noise ground return for the FB, INTVCC, and MODE/SYNC pins. By separating this path from power ground (GND on Pin 9), it prevents switching noise from modulating the feedback voltage - resulting in cleaner regulation, improved load transient response, and reduced output voltage ripple in precision applications.
What is the purpose of the PGOOD pin on LTC3621HMS8E#PBF?
The PGOOD pin on LTC3621HMS8E#PBF is an open-drain indicator that asserts high when the output voltage is within ±7.5% of its regulated value. It includes a 32-cycle blanking delay to suppress false triggers during startup or load transients - enabling reliable power sequencing and system reset in automotive and industrial controllers.
Can LTC3621HMS8E#PBF operate in dropout mode, and how is it handled?
Yes, the LTC3621HMS8E#PBF supports full dropout operation down to VIN ≈ VOUT. In forced continuous mode, it maintains regulation by holding the top PMOS switch fully on; in Burst Mode or pulse-skipping, it transitions in/out of sleep to preserve ultralow IQ - extending input battery life while maintaining output stability during brownout conditions.
LTC3621HMS8E#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LTC3621HMS8E#PBF FAQ
1.How can I place an order for LTC3621HMS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621HMS8E#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 LTC3621HMS8E#PBF reliable?
The price and inventory of LTC3621HMS8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3621HMS8E#PBF is usually 5 days.
3.What payment methods are accepted for LTC3621HMS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621HMS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621HMS8E#PBF?
LTC3621HMS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621HMS8E#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 LTC3621HMS8E#PBF?
For technical support, including LTC3621HMS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621HMS8E#PBF requirements.
6.How does Aetrix verify that LTC3621HMS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3621HMS8E#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 LTC3621HMS8E#PBF meets industry standards.
7.What is the process for return or replacement of LTC3621HMS8E#PBF?
All LTC3621HMS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621HMS8E#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 LTC3621HMS8E#PBF part is unused and in its original packaging.
Return procedure for LTC3621HMS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3621HMS8E#PBF 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…
