My Inquiry
My Account
Analog Devices Inc. LTC3621IDCB-5#TRPBF
- Part No.:
- LTC3621IDCB-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3621IDCB-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,354
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3621IDCB-5#TRPBF from Analog Devices is a 17V, 1A synchronous step-down regulator in a 6-lead DFN (2mm × 3mm) package, operating at fixed 1MHz switching frequency with 5V fixed output voltage, ±1% output accuracy, and ultralow 3.5µA quiescent current - deployed in automotive emergency radios requiring high efficiency under wide-input-voltage battery conditions.
For engineers reviewing the LTC3621IDCB-5#TRPBF datasheet, LTC3621IDCB-5#TRPBF pinout, LTC3621IDCB-5#TRPBF application, or LTC3621IDCB-5#TRPBF equivalent, this page delivers verified electrical parameters, thermal performance data, mode-select behavior (Burst/Pulse-Skipping/Forced Continuous), and confirmed AEC-Q100 qualification status for production-grade design-in.
Technical Context
The LTC3621IDCB-5#TRPBF implements a constant-frequency peak-current-mode control architecture with internal compensation, enabling stable regulation across 2.7V–17V input while delivering up to 1A at fixed 5V output. Its 1MHz oscillator supports ±40% external synchronization via MODE/SYNC pin and integrates overtemperature protection with 125°C max junction rating.
It features three selectable operating modes: Burst Mode (3.5µA IQ, 400mA clamp), pulse-skipping (low ripple), and forced continuous (zero-load capability). The device includes integrated PMOS/NMOS power switches with RDS(ON) of 0.37Ω/0.15Ω, soft-start (800µs), and undervoltage lockout (2.7V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% - eliminates external feedback divider, simplifies layout and improves load regulation stability. |
| Input Voltage Range | 2.7V to 17V - supports 12V automotive battery systems including cold-crank (down to 2.7V) and load-dump transients. |
| Max Output Current | 1A continuous - sufficient for powering microcontrollers, sensors, and RF modules in portable industrial devices. |
| Quiescent Current | 3.5µA in Burst Mode - enables multi-year battery life in always-on emergency radio standby applications. |
| Switching Frequency | 1.00MHz ±8% - allows use of compact 2.2µH inductors and reduces EMI filter size versus lower-frequency alternatives. |
| Thermal Rating | –40°C to +125°C junction - qualified per AEC-Q100 Grade I, suitable for under-hood and dashboard-mounted automotive electronics. |
| Package | 6-lead DFN (2mm × 3mm) with exposed GND pad - provides low θJA = 64°C/W for passive thermal management without heatsinks. |
Pinout & Package
6-lead DFN (2mm × 3mm) package with exposed thermal pad (Pin 7, GND), rated for –40°C to +125°C operation. Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt square-wave current - requires short, low-inductance routing to minimize EMI and voltage spikes. |
| VIN (Pin 2) | Input supply | Accepts 2.7V–17V; must be bypassed with ≥10µF ceramic capacitor close to pin to suppress high-frequency noise and supply ripple. |
| RUN (Pin 3) | Enable control | Active-high logic input; tie to VIN or microcontroller GPIO to initiate startup - floating prohibited. |
| FB (Pin 4) | Feedback reference | Internally connected to 5V output; no external resistor divider needed - ensures precise 5V regulation without calibration drift. |
| INTVCC (Pin 5) | Bias LDO output | 3.6V internal LDO output; requires ≥1µF ceramic bypass to GND for gate drive stability and transient response. |
| MODE/SYNC (Pin 6) | Mode selection & sync | Tie to INTVCC for Burst Mode (low IQ), GND for pulse-skipping (low ripple), or external clock for forced continuous + synchronization. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Grade I (–40°C to +125°C) - validated for automotive safety-critical subsystems including telematics and emergency alert systems. |
| Ultralow Quiescent Current | 3.5µA in Burst Mode - extends battery runtime in always-on portable scanners and handheld diagnostic tools. |
| Internal Compensation | No external compensation components required - reduces BOM count and layout sensitivity across temperature and load variations. |
| Full Dropout Operation | Maintains regulation down to VIN = VOUT with low IQ - critical for brownout resilience in 5V rail generation from aging Li-ion or lead-acid batteries. |
| Overtemperature Protection | Thermal shutdown at TJ > 125°C with automatic recovery - prevents permanent damage during sustained overload or poor airflow conditions. |
Applications
| Automotive Emergency Radio | Industrial Handheld Scanner |
|---|---|
|
Use Scenario: Powering RF transceiver, MCU, and audio amplifier in battery-backed vehicle emergency communication system. IC Role / Device Role / Timing Role: Primary 5V buck regulator supplying all digital and analog subsystems from 12V battery with cold-crank support. Use Value: 3.5µA quiescent current preserves battery charge during multi-week standby; 1MHz switching enables compact 2.2µH inductor and small ceramic caps. |
Use Scenario: Providing regulated 5V rail to barcode imager, BLE SoC, and touch interface in ruggedized warehouse scanner. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter replacing linear regulators to reduce thermal load in sealed plastic enclosure. Use Value: 95% peak efficiency at 500mA reduces heat dissipation by >1W vs. LDO; DFN package fits tight board space constraints. |
| Embedded Computing Module | Portable Medical Diagnostic Tool |
|
Use Scenario: Generating stable 5V supply for ARM-based compute module in fanless edge gateway with wide ambient temperature range. IC Role / Device Role / Timing Role: Main system power IC with PGOOD monitoring (via MS8E variant) - not applicable to DFN variant but confirms functional lineage. Use Value: ±1% output accuracy ensures reliable USB peripheral enumeration; AEC-Q100 qualification validates long-term reliability in unattended deployments. |
Use Scenario: Powering precision ADC, OLED display, and wireless transmitter in handheld ECG or glucose monitor with coin-cell backup. IC Role / Device Role / Timing Role: Primary DC-DC converter enabling extended battery life while maintaining strict 5V tolerance for sensor signal chain integrity. Use Value: Burst Mode operation draws only 3.5µA during sleep cycles between measurements - directly extends single-charge operation to >30 days. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3.0V–17V input, 3A output, 2.5MHz fixed frequency, 17µA IQ - higher current, higher IQ, no AEC-Q100 grade. | Preferred for higher-current industrial HMIs where thermal headroom exists; unsuitable for automotive qualification-critical designs. | Select when >1A load or faster transient response is required; verify layout compatibility due to different pinout and thermal pad configuration. |
| MP2315GJ-Z | 4.5V–28V input, 1.5A output, 500kHz–1.5MHz adjustable frequency, 26µA IQ - wider VIN, higher IQ, no fixed 5V option. | Suitable for 24V industrial PLC I/O modules; lacks AEC-Q100 and fixed 5V version - requires external feedback network. | Choose for cost-sensitive non-automotive applications needing wider input range; expect added design effort for feedback tuning and stability validation. |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621IDCB-5#TRPBF delivers uniquely low 3.5µA quiescent current and AEC-Q100 qualification in a compact DFN, making it optimal for battery-powered automotive and portable medical devices where standby efficiency and regulatory compliance are non-negotiable.
Availability
LTC3621IDCB-5#TRPBF is available at Aetrix Electronics and suitable for automotive emergency radios, industrial handheld scanners, and portable medical diagnostic tools requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for LTC3621IDCB-5#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 power management semiconductors, serving industrial, automotive, communications, and healthcare markets with precision, reliability, and innovation.
The LTC3621 family is designed for high-efficiency, low-quiescent-current DC-DC conversion in space-constrained and battery-sensitive applications - emphasizing ultralow IQ, wide input range, and automotive-grade robustness.
FAQ
What is the output voltage tolerance of the LTC3621IDCB-5#TRPBF?
The LTC3621IDCB-5#TRPBF provides a fixed 5.0V output with ±1% accuracy over temperature and line/load conditions, as specified in the Electrical Characteristics table (VOUT = 4.95V to 5.05V at ILOAD = 1A, TJ = –40°C to +125°C). This tight tolerance eliminates need for post-regulation trimming in USB-compliant or sensor-bus applications.
Does the LTC3621IDCB-5#TRPBF require external feedback resistors?
No - the LTC3621IDCB-5#TRPBF is a fixed 5V output variant; its FB pin is internally connected to the regulated output, so no external resistor divider is required. This reduces component count, improves reliability, and avoids tolerance stacking errors common in adjustable versions like LTC3621IDCB-2#TRPBF.
What is the maximum junction temperature rating for the LTC3621IDCB-5#TRPBF?
The LTC3621IDCB-5#TRPBF is rated for operation up to +125°C junction temperature and is qualified per AEC-Q100 Grade I. Its DFN package has θJA = 64°C/W; with proper PCB copper area under the exposed pad, it sustains 1A output continuously at +85°C ambient without derating.
Can the LTC3621IDCB-5#TRPBF synchronize to an external clock?
Yes - the MODE/SYNC pin supports external clock synchronization within ±40% of its nominal 1MHz frequency (i.e., 600kHz–1.4MHz). When driven by a clean CMOS clock, the LTC3621IDCB-5#TRPBF enters forced continuous mode and locks to the external source within 2–3 cycles, enabling EMI reduction in noise-sensitive systems.
How does the LTC3621IDCB-5#TRPBF achieve ultralow quiescent current?
The LTC3621IDCB-5#TRPBF achieves 3.5µA quiescent current in Burst Mode by disabling both power switches during light-load intervals, maintaining regulation only through periodic energy bursts. Internal circuitry remains active at minimal bias, enabling fast wake-up (<10µs) while drawing less than 4µA from VIN - critical for multi-year battery life.
LTC3621IDCB-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-WFDFN 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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x3)
LTC3621IDCB-5#TRPBF FAQ
1.How can I place an order for LTC3621IDCB-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621IDCB-5#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 LTC3621IDCB-5#TRPBF reliable?
The price and inventory of LTC3621IDCB-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3621IDCB-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621IDCB-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621IDCB-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621IDCB-5#TRPBF?
LTC3621IDCB-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621IDCB-5#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 LTC3621IDCB-5#TRPBF?
For technical support, including LTC3621IDCB-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621IDCB-5#TRPBF requirements.
6.How does Aetrix verify that LTC3621IDCB-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621IDCB-5#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 LTC3621IDCB-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621IDCB-5#TRPBF?
All LTC3621IDCB-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621IDCB-5#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 LTC3621IDCB-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621IDCB-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3621IDCB-5#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…
