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Analog Devices Inc. LTC3624IDD-23.3#TRPBF
- Part No.:
- LTC3624IDD-23.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3624IDD-23.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,526
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Product details
Overview
LTC3624IDD-23.3#TRPBF from Analog Devices (formerly Linear Technology) is a 2.25MHz, 3.3V fixed-output synchronous step-down regulator delivering up to 2A output current with 3.5µA quiescent current and ±1% output voltage accuracy. It operates from 2.7V to 17V input, supports 100% duty cycle dropout, and is optimized for battery-powered portable instrumentation requiring ultra-low IQ and compact size.
For engineers reviewing the LTC3624IDD-23.3#TRPBF datasheet, LTC3624IDD-23.3#TRPBF pinout, LTC3624IDD-23.3#TRPBF application, or LTC3624IDD-23.3#TRPBF equivalent, key selection criteria include its 2.25MHz switching frequency for small external components, fixed 3.3V output eliminating feedback resistors, Burst Mode® operation enabling 3.5µA IQ at light load, and DFN-8 (3mm × 3mm) thermal performance with exposed GND pad.
Technical Context
The LTC3624IDD-23.3#TRPBF implements a constant-frequency peak current mode control architecture with internal compensation and 1ms soft-start. Its 2.25MHz oscillator enables use of sub-3.3µH inductors and low-ESR ceramic capacitors while maintaining stability across 2.7V–17V input range.
It integrates both PMOS high-side and NMOS low-side power switches with 200mΩ/115mΩ RDS(ON), supports three operating modes via MODE/SYNC pin (Burst Mode®, pulse-skipping, forced continuous), and features overtemperature protection, VIN overvoltage lockout (19V), and PGOOD with 32-cycle blanking delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% (no external resistor divider required) |
| Switching Frequency | 2.25MHz ±20% (enables compact 2.2µH inductor and 4.7µF output capacitor) |
| Quiescent Current | 3.5µA in Burst Mode® (extends battery life in always-on sensor nodes) |
| Max Output Current | 2A continuous (supports microcontroller + RF transceiver loads) |
| Input Voltage Range | 2.7V to 17V (compatible with single-cell Li-ion, dual-cell alkaline, and 12V industrial rails) |
| Duty Cycle Range | 0% to 100% (maintains regulation down to VOUT – 100mV input) |
| Feedback Reference | 0.6V internal reference (used internally; FB pin tied directly to VOUT for fixed output) |
Pinout & Package
Package: 8-Lead (3mm × 3mm) Plastic DFN with exposed GND pad (DD package). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Node | Connects to inductor; carries high di/dt square wave; requires tight layout and Kelvin connection to minimize EMI |
| VIN (Pin 2) | Main Input Supply | Accepts 2.7V–17V; bypass with ≥10µF ceramic capacitor placed adjacent to pin |
| RUN (Pin 3) | Enable Control | Active-high logic input; must be pulled high (>1.0V) to enable regulation; tie to VIN or microcontroller GPIO |
| PGOOD (Pin 4) | Power Good Indicator | Open-drain output asserting high when VOUT is within ±7.5% of 3.3V; includes 32-cycle blanking to suppress transient glitches |
| FB (Pin 5) | Feedback Input | Internally connected to 3.3V output; no external divider needed (fixed-output configuration) |
| INTVCC (Pin 6) | Buck LDO Output | 3.6V internal LDO powering gate drivers; bypass with ≥2.2µF ceramic to GND |
| MODE/SYNC (Pin 7) | Operating Mode Select | Tie to INTVCC for Burst Mode® (3.5µA IQ); tie to GND for pulse-skipping (low ripple); apply 1V–2.4V for forced continuous mode |
| GND (Pins 8 & Exposed Pad) | Signal and Power Ground | Primary return path for SW, VIN, INTVCC, and PGOOD; exposed pad must be soldered for thermal integrity |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces IQ to 3.5µA at light load while maintaining regulation-critical for multi-year battery life in IoT sensors |
| 2.25MHz Fixed Switching Frequency | Enables use of 2.2µH inductors and 4.7µF ceramic output caps, shrinking total solution size by >40% vs 1MHz alternatives |
| 100% Duty Cycle Capability | Supports dropout operation down to VIN = VOUT + 100mV, extending runtime in deep-discharge battery applications |
| Integrated Power MOSFETs | Eliminates external high-side PMOS and low-side NMOS, reducing BOM count and layout complexity |
| Internal Compensation & Soft-Start | Removes need for external compensation network; 1ms internal soft-start prevents inrush current during power-up |
Applications
| Portable Medical Sensors | Industrial Wireless Transceivers |
|---|---|
Use Scenario: Wearable ECG patch powered by coin cell with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Primary 3.3V system supply regulating from 2.8V–3.6V battery, enabling ultralow-power MCU and analog front-end. Use Value: 3.5µA quiescent current in Burst Mode® extends battery life beyond 10 years; fixed 3.3V output eliminates resistor tolerance error in precision analog signal chain. | Use Scenario: LoRaWAN node deployed in remote infrastructure monitoring with intermittent solar charging. IC Role / Device Role / Timing Role: Main 3.3V rail for SX1276 transceiver and ARM Cortex-M0+ MCU, handling wide input (3.2V–16V) from supercapacitor + PV panel. Use Value: 2.25MHz switching allows tiny 2.2µH shielded inductor; 100% duty cycle maintains regulation as supercapacitor discharges below 3.3V. |
| Emergency Communication Radios | Handheld Test Equipment |
Use Scenario: Battery-backed emergency radio requiring instant-on capability and 500-hour standby on AA cells. IC Role / Device Role / Timing Role: Always-on 3.3V supply for RTC, memory retention, and wake-up circuitry; transitions to full regulation upon button press. Use Value: Zero-current shutdown (IQ < 0.1µA) preserves battery during storage; PGOOD signal validates stable rail before enabling RF section. | Use Scenario: Portable multimeter with LCD, ADC, and Bluetooth LE, powered by rechargeable Li-ion. IC Role / Device Role / Timing Role: Efficient 3.3V conversion from 3.7V–4.2V battery, supporting dynamic load steps from display backlight to BLE burst transmission. Use Value: Pulse-skipping mode (selected via grounded MODE/SYNC) minimizes output ripple (<15mVPP) during sensitive ADC measurements without sacrificing efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62840DLCR | 1.8V–6.5V input; 0.6µA IQ; 2.25MHz; fixed 3.3V; 1.5A output | Lower max current and narrower input range; better for ultra-low-power sub-1A loads | Select when IQ < 1µA is mandatory and 1.5A output suffices |
| MP2166GJ-Z | 2.5V–6V input; 17µA IQ; 2.2MHz; adjustable output; 2A output | Higher IQ, narrower VIN range, requires external feedback resistors | Select when adjustable VOUT is needed and 17µA IQ is acceptable |
Compared with TPS62840DLCR and MP2166GJ-Z, the LTC3624IDD-23.3#TRPBF uniquely combines 2A capability, 17V input support, and 3.5µA IQ in a fixed 3.3V configuration-making it optimal for industrial battery systems where wide input range and long shelf life coexist.
Availability
LTC3624IDD-23.3#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, emergency radios, and industrial wireless transceivers requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3624IDD-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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3624 product line delivers ultralow-IQ monolithic buck regulators for battery-critical applications, emphasizing efficiency across wide load ranges and robust operation under input transients and thermal stress.
FAQ
What is the maximum input voltage rating for the LTC3624IDD-23.3#TRPBF?
The LTC3624IDD-23.3#TRPBF has an absolute maximum input voltage rating of 17V. Operation above this level risks permanent damage. The device includes VIN overvoltage lockout that suspends switching when VIN exceeds 19V and resumes normal operation once VIN drops below 18.5V. For reliable long-term operation, keep steady-state VIN ≤17V and transient spikes within the 19V OVLO threshold.
Does the LTC3624IDD-23.3#TRPBF require external feedback resistors to set its output voltage?
No, the LTC3624IDD-23.3#TRPBF does not require external feedback resistors. As a fixed-output variant, its 3.3V regulation is implemented internally-the FB pin is internally connected to the output, eliminating resistor tolerance errors and saving board space. This differs from adjustable versions like LTC3624IDD-2, which require an external R1/R2 divider.
How does the MODE/SYNC pin configure operating modes on the LTC3624IDD-23.3#TRPBF?
The MODE/SYNC pin configures three distinct operating modes on the LTC3624IDD-23.3#TRPBF: tie to INTVCC for Burst Mode® (3.5µA IQ), tie to GND for pulse-skipping (lowest output ripple), or apply 1.0V–2.4V for forced continuous mode (best transient response). It also accepts external clock signals within ±40% of 2.25MHz to synchronize switching frequency.
What thermal considerations apply to the LTC3624IDD-23.3#TRPBF's exposed pad?
The exposed pad (Pin 9) of the LTC3624IDD-23.3#TRPBF is electrically and thermally connected to GND and must be soldered to a PCB copper pour for optimal performance. Without proper thermal vias and pad connection, θJA degrades from 43°C/W to >80°C/W, risking thermal shutdown at >1.2A load. Use ≥4 thermal vias (0.3mm diameter) under the pad, connected to inner-layer GND planes.
Is the LTC3624IDD-23.3#TRPBF RoHS-compliant and lead-free?
Yes, the LTC3624IDD-23.3#TRPBF is RoHS-compliant and features a lead-free finish. Its part number suffix "#TRPBF" explicitly denotes lead-free, tape-and-reel packaging per JEDEC J-STD-020 moisture sensitivity level 3. The device meets IPC/JEDEC J-STD-020D reflow profile requirements and is qualified for industrial temperature range (–40°C to 125°C).
LTC3624IDD-23.3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-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):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC3624IDD-23.3#TRPBF FAQ
1.How can I place an order for LTC3624IDD-23.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624IDD-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 LTC3624IDD-23.3#TRPBF reliable?
The price and inventory of LTC3624IDD-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 LTC3624IDD-23.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3624IDD-23.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624IDD-23.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624IDD-23.3#TRPBF?
LTC3624IDD-23.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624IDD-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 LTC3624IDD-23.3#TRPBF?
For technical support, including LTC3624IDD-23.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624IDD-23.3#TRPBF requirements.
6.How does Aetrix verify that LTC3624IDD-23.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3624IDD-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 LTC3624IDD-23.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3624IDD-23.3#TRPBF?
All LTC3624IDD-23.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624IDD-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 LTC3624IDD-23.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3624IDD-23.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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