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Analog Devices Inc. LTC3621HMS8E-23.3#TRPBF
- Part No.:
- LTC3621HMS8E-23.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621HMS8E-23.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,477
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Product details
Overview
LTC3621HMS8E-23.3#TRPBF from Analog Devices is a 2.25MHz, 3.3V fixed-output synchronous step-down regulator delivering up to 1A output current with 3.5µA quiescent current. It operates from 2.7V to 17V input, features ±1% output voltage accuracy, internal compensation, and integrated power-good (PGOOD) and signal ground (SGND) pins in an 8-lead MSOP package. It is used in automotive emergency radios requiring ultra-low IQ and stable 3.3V rail generation under wide VIN transients.
For engineers reviewing the LTC3621HMS8E-23.3#TRPBF datasheet, LTC3621HMS8E-23.3#TRPBF pinout, LTC3621HMS8E-23.3#TRPBF application, or LTC3621HMS8E-23.3#TRPBF equivalent, key selection criteria include guaranteed operation up to 150°C junction temperature, 2.25MHz switching frequency for compact filter design, fixed 3.3V output with ±1% tolerance over temperature, and AEC-Q100 qualification for automotive use cases.
Technical Context
The LTC3621HMS8E-23.3#TRPBF uses constant-frequency peak current mode control with internal slope compensation, enabling stable operation up to 100% duty cycle during dropout. Its MODE/SYNC pin supports three operating modes-Burst Mode (≤3.5µA IQ), pulse-skipping (low ripple), and forced continuous (fixed frequency)-and allows synchronization to external clocks within ±40% of 2.25MHz.
It integrates dual MOSFETs (top PMOS RDS(ON) = 0.37Ω, bottom NMOS RDS(ON) = 0.15Ω at VIN = 5V), a 0.6V reference amplifier, soft-start (800µs), overtemperature protection, and VIN overvoltage lockout (19V rising). The MS8E package includes dedicated SGND and PGOOD pins with ±7.5% regulation window and 32-cycle blanking delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports automotive battery transients and industrial 12V/15V rails without external pre-regulation. |
| Output Voltage | Fixed 3.3V ±1% - eliminates external feedback resistors and ensures precise microcontroller I/O rail compliance. |
| Switching Frequency | 2.25MHz (±20% over temp) - enables use of sub-3mm inductors and reduces EMI fundamental frequency above AM band. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on emergency radio standby for >1 year on coin cell. |
| Max Output Current | 1A continuous - drives multiple low-power MCUs, CAN transceivers, and RF front-ends from single buck stage. |
| Junction Temp Range | –40°C to +150°C - qualified for under-hood automotive applications per AEC-Q100 Grade H. |
| PGOOD Accuracy | ±7.5% window with 32-cycle blanking - prevents false fault triggers during load transients in embedded computing. |
Pinout & Package
Package: 8-lead plastic MSOP (MS8E) with exposed thermal pad (Pin 9 = GND), rated for –40°C to +150°C operation. Thermally enhanced layout requires soldering exposed pad to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt square wave - requires short, low-inductance PCB trace and local ceramic decoupling. |
| VIN (Pin 2) | Input supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and gate drivers - must be bypassed with ≥10µF ceramic capacitor. |
| RUN (Pin 3) | Enable control | Active-high logic input; pulls down to disable regulator and reduce IQ to ≤0.1µA - no pull-up required. |
| FB (Pin 5) | Feedback reference | Internally tied to 3.3V output; not user-accessible in fixed-VOUT version - eliminates external resistor divider errors. |
| INTVCC (Pin 6) | Bias LDO output | 3.6V regulated supply for internal circuitry - bypass with ≥1µF ceramic capacitor close to pin. |
| MODE/SYNC (Pin 7) | Operating mode select | Configures Burst Mode (tie to INTVCC), pulse-skipping (tie to GND), or sync/forced continuous (external clock or 1V–2.4V). |
| PGOOD (Pin 4) | Power-good indicator | Open-drain output pulled high when VOUT is within ±7.5% of 3.3V - used for system power sequencing and fault monitoring. |
| SGND (Pin 8) | Signal ground | Dedicated analog ground return for FB, MODE/SYNC, and PGOOD - isolated from power GND to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade H qualification | Guaranteed operation from –40°C to +150°C junction temperature - meets automotive under-hood reliability requirements. |
| Integrated PGOOD with blanking | 32-cycle delay prevents false low assertions during dynamic load steps - simplifies system-level power monitoring without external timers. |
| Three selectable operating modes | Burst Mode (3.5µA IQ), pulse-skipping (low VOUT ripple), and forced continuous (EMI-controlled fixed frequency) - enables optimization per application phase. |
| Full dropout operation | Maintains regulation down to VIN = VOUT with 100% duty cycle - critical for brownout resilience in battery-powered emergency systems. |
| Internal compensation | Eliminates external compensation network - reduces BOM count and layout sensitivity while ensuring stability across all loads and input voltages. |
Applications
| Automotive Emergency Radio | Industrial Handheld Scanner |
|---|---|
Use Scenario: Powering ARM Cortex-M4 MCU, Si4463 RF transceiver, and OLED display from 12V vehicle battery with cold-crank immunity. IC Role / Device Role / Timing Role: Primary 3.3V power rail generator with PGOOD signaling for safe boot sequence and watchdog reset coordination. Use Value: 3.5µA quiescent current extends backup battery life >12 months; 150°C rating survives under-dash mounting; 2.25MHz switching avoids AM band interference. |
Use Scenario: Supplying barcode imager sensor, BLE SoC, and capacitive touch controller in portable warehouse scanner with Li-ion battery. IC Role / Device Role / Timing Role: Fixed 3.3V buck converter with integrated soft-start and PGOOD for controlled power-up of mixed-signal subsystems. Use Value: ±1% output accuracy ensures reliable ADC reference and digital I/O levels; compact MSOP footprint saves space on dense handheld PCB. |
| Embedded Telematics Gateway | Railway Onboard Control Unit |
Use Scenario: Generating 3.3V rail for CAN FD controller, GPS module, and cellular modem in vehicle telematics box exposed to 24V battery swings. IC Role / Device Role / Timing Role: High-efficiency DC-DC regulator with sync capability to align switching noise with system clock domain and reduce EMI filtering cost. Use Value: 2.25MHz sync range (±40%) allows alignment to 1.35–3.15MHz master clock; AEC-Q100 qualification validates long-term field reliability. |
Use Scenario: Providing stable 3.3V supply to FPGA configuration memory and Ethernet PHY in EN50155-compliant train control electronics. IC Role / Device Role / Timing Role: Input-transient-hardened buck regulator with overvoltage lockout (19V) and undervoltage detection (2.7V) for railway 72/110V battery-fed intermediate 12V bus. Use Value: VIN OVP protects against load-dump spikes; full dropout operation maintains FPGA configuration during 12V bus sag to 3.3V; PGOOD enables fail-safe shutdown sequencing. |
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 |
|---|---|---|---|
| TPS62130ARGTR | 3.0V–17V input, adjustable 0.9V–6.05V output, 2.25MHz, 3.5µA IQ, but no PGOOD or SGND pin; 6-pin WSON package. | Lacks dedicated signal ground and power-good output - requires external comparator and careful ground partitioning for noise-sensitive applications. | Select when board space is constrained and PGOOD/SGND isolation is not required; verify loop stability with external compensation. |
| MAX17503GCU+T | 4.5V–60V input, adjustable output, 2.2MHz, 1.2mA IQ, integrated FETs, but only rated to 125°C and no AEC-Q100 qualification. | Higher VIN range suits industrial 48V systems, but higher IQ and lower temp grade limit use in automotive under-hood environments. | Prefer for wide-input industrial power supplies where 150°C operation and automotive qualification are unnecessary. |
Compared with TPS62130ARGTR and MAX17503GCU+T, the LTC3621HMS8E-23.3#TRPBF uniquely combines AEC-Q100 Grade H qualification, integrated PGOOD with blanking, dedicated SGND, and 3.5µA IQ in a fixed 3.3V solution - making it optimal for safety-critical automotive and railway applications demanding proven reliability and minimal external components.
Availability
LTC3621HMS8E-23.3#TRPBF is available at Aetrix Electronics and suitable for automotive emergency radios, industrial handheld scanners, embedded telematics gateways, and railway onboard control units requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for LTC3621HMS8E-23.3#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3621 family is designed for high-efficiency, ultra-low-quiescent-current DC-DC conversion in space-constrained and thermally demanding applications - especially automotive infotainment, telematics, and safety systems requiring AEC-Q100 compliance.
FAQ
What is the maximum junction temperature specification for the LTC3621HMS8E-23.3#TRPBF?
The LTC3621HMS8E-23.3#TRPBF is specified for operation from –40°C to +150°C junction temperature and is AEC-Q100 Grade H qualified. This rating is validated through extended characterization and statistical process control, enabling use in under-hood automotive locations where ambient temperatures exceed 105°C.
Does the LTC3621HMS8E-23.3#TRPBF require external feedback resistors to set its output voltage?
No. The LTC3621HMS8E-23.3#TRPBF is a fixed 3.3V output variant - the FB pin is internally connected to the output, eliminating the need for external resistors. This improves accuracy by removing resistor tolerance and thermal drift effects, and simplifies layout by reducing component count.
How does the PGOOD function behave during output load transients on the LTC3621HMS8E-23.3#TRPBF?
The LTC3621HMS8E-23.3#TRPBF asserts PGOOD high when VOUT is within ±7.5% of 3.3V and includes a 32-switching-cycle blanking delay on the falling edge. This prevents false low assertions during fast load steps - for example, a 100mA-to-500mA transient at 2.25MHz results in ~14µs blanking, ensuring robust system sequencing.
Can the LTC3621HMS8E-23.3#TRPBF synchronize to an external clock, and what is the acceptable frequency range?
Yes. When the MODE/SYNC pin is driven by an external clock, the LTC3621HMS8E-23.3#TRPBF synchronizes to frequencies from 1.35MHz to 3.15MHz (±40% of its nominal 2.25MHz). Sync acquisition occurs within 2–3 external clock cycles, and loss of the external clock causes reversion to internal frequency within ~7µs.
What is the purpose of the SGND pin on the LTC3621HMS8E-23.3#TRPBF, and how should it be routed?
The SGND pin (Pin 8) provides a dedicated low-noise analog ground return for the FB, MODE/SYNC, and PGOOD circuits. It must be connected to the system's analog ground plane and kept separate from power GND traces to prevent switching noise from modulating the feedback path - improving output voltage accuracy and transient response.
LTC3621HMS8E-23.3#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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LTC3621HMS8E-23.3#TRPBF FAQ
1.How can I place an order for LTC3621HMS8E-23.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621HMS8E-23.3#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 LTC3621HMS8E-23.3#TRPBF reliable?
The price and inventory of LTC3621HMS8E-23.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3621HMS8E-23.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621HMS8E-23.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621HMS8E-23.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621HMS8E-23.3#TRPBF?
LTC3621HMS8E-23.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621HMS8E-23.3#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 LTC3621HMS8E-23.3#TRPBF?
For technical support, including LTC3621HMS8E-23.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621HMS8E-23.3#TRPBF requirements.
6.How does Aetrix verify that LTC3621HMS8E-23.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621HMS8E-23.3#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 LTC3621HMS8E-23.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621HMS8E-23.3#TRPBF?
All LTC3621HMS8E-23.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621HMS8E-23.3#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 LTC3621HMS8E-23.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621HMS8E-23.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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