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Analog Devices Inc. LTC3624EDD#PBF
- Part No.:
- LTC3624EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3624EDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,298
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Product details
Overview
LTC3624EDD#PBF from Analog Devices (formerly Linear Technology) is a 17V, 2A synchronous step-down DC/DC regulator in an 8-lead 3mm × 3mm DFN package, featuring 1MHz fixed switching frequency, 3.5µA quiescent current in Burst Mode, and adjustable 0.6V–VIN output voltage. It delivers high efficiency (>95%) across wide input (2.7V–17V) and load ranges, optimized for battery-powered instrumentation and emergency radios.
For engineers reviewing the LTC3624EDD#PBF datasheet, LTC3624EDD#PBF pinout, LTC3624EDD#PBF application, or LTC3624EDD#PBF equivalent, key selection criteria include ultralow IQ operation, ±1% output voltage accuracy, internal compensation, thermal shutdown, and compatibility with ceramic input/output capacitors in space-constrained designs.
Technical Context
The LTC3624EDD#PBF employs a constant-frequency peak current mode control architecture with internal slope compensation, enabling stable regulation and excellent transient response. Its error amplifier compares FB voltage to a 0.6V reference, adjusting peak inductor current via ITH to maintain output regulation across line and load variations.
It supports three operating modes selected via MODE/SYNC: Burst Mode (3.5µA IQ, 800mA clamp), pulse-skipping (low ripple), and forced continuous (fixed 1MHz, zero-load capable). The device integrates an INTVCC LDO, overtemperature protection, VIN overvoltage lockout (19V trip), and soft-start (1ms ramp).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports single-cell Li-ion up to 12V industrial rails without external pre-regulation. |
| Output Voltage Range | 0.6V to VIN - enables direct generation of sub-1V core supplies or adjustable bias voltages. |
| Max Output Current | 2A - sustains full rated load at 12VIN/3.3VOUT with <15°C junction rise in DFN package. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on sensor nodes and emergency beacons. |
| Switching Frequency | 1MHz (±40% sync range) - allows compact 2.2µH inductors and reduces EMI fundamental below 20MHz. |
| Feedback Reference | 0.6V ±1% - ensures precise output setting with minimal resistor tolerance impact on VOUT accuracy. |
| Efficiency (Typical) | 95% at 1A, 5VOUT, 12VIN - minimizes thermal stress and PCB area in sealed enclosures. |
Pinout & Package
Package: 8-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 9 = GND), rated for –40°C to 125°C junction temperature and 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 low-inductance path to minimize EMI. |
| VIN (Pin 2) | Main power input | Accepts 2.7V–17V; powers internal circuitry and top PMOS switch - bypass with ≥10µF ceramic near pin. |
| RUN (Pin 3) | Enable control | Active-high logic input; pulls low to disable regulator and reduce IQ to 0.1µA - must not float. |
| PGOOD (Pin 4) | Power-good indicator | Open-drain output pulled low if VOUT deviates >±7.5%; includes 32-cycle blanking to suppress transients. |
| FB (Pin 5) | Feedback input | Senses resistive divider output; regulates VOUT = 0.6V × (1 + R2/R1) - high-impedance (10nA bias) for precision. |
| INTVCC (Pin 6) | Internal LDO output | 3.6V regulated supply for gate drivers and logic; requires ≥2.2µF ceramic bypass to GND. |
| MODE/SYNC (Pin 7) | Mode select & sync input | Tied to INTVCC = Burst Mode; GND = pulse-skipping; 1V–2.4V = forced continuous; accepts external clock. |
| GND (Pins 8, 9) | Signal & power ground | Exposed pad (Pin 9) is electrically and thermally GND - must be soldered to large PCB copper pour. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 3.5µA in Burst Mode enables >1-year runtime on coin cells in intermittent-sensing applications. |
| 100% duty cycle dropout | Maintains regulation down to VIN ≈ VOUT with PMOS fully on - critical for brownout resilience in portable systems. |
| Integrated soft-start | 1ms internal ramp prevents inrush current and output overshoot during power-up. |
| Overtemperature protection | Thermal shutdown activates at TJ = 125°C (E-grade), protecting against sustained overload or poor heatsinking. |
| Current-mode control | Provides inherent cycle-by-cycle current limiting and fast load transient response (<10µs recovery). |
Applications
| Battery-Powered Instrumentation | Emergency Radios |
|---|---|
Use Scenario: Portable multimeters and handheld oscilloscopes requiring long battery life and stable analog supply rails. IC Role / Device Role / Timing Role: Primary 3.3V/5V step-down regulator powering microcontroller, ADC, and display backlight. Use Value: 3.5µA IQ extends alkaline AA battery life to >6 months in sleep mode; 1MHz switching enables small 2.2µH inductor footprint. | Use Scenario: Hand-crank or solar-charged emergency communication devices needing reliable startup under low-VIN conditions. IC Role / Device Role / Timing Role: Main power converter delivering 5V from variable 3V–12V input sources with dropout support. Use Value: 100% duty cycle operation maintains VOUT regulation even as input drops to 5.1V; ±1% VFB ensures accurate audio codec biasing. |
| Portable Medical Sensors | Industrial IoT Edge Nodes |
Use Scenario: Wearable ECG monitors powered by rechargeable LiPo batteries with strict leakage requirements. IC Role / Device Role / Timing Role: Low-noise 2.5V supply for precision op-amps and SAR ADCs, operating in Burst Mode between measurements. Use Value: 3.5µA IQ minimizes self-discharge; internal compensation eliminates external compensation components, reducing BOM count. | Use Scenario: Wireless sensor nodes deployed in remote locations with infrequent data transmission and long sleep intervals. IC Role / Device Role / Timing Role: System power manager converting 12V field bus to 3.3V MCU and RF transceiver supply. Use Value: 17V absolute max rating tolerates automotive load-dump transients; PGOOD signal validates supply before waking MCU. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62840DRVR | 2.7V–6V input, 1.8V–5.5V fixed/adjustable output, 0.36µA IQ, 2.25MHz switching | Lower input voltage ceiling limits use in 12V systems; superior IQ for ultra-low-power sub-1V MCU cores | Select when input is strictly ≤6V and nanowatt standby dominates design priority over wide-VIN flexibility. |
| MP2451DT-LF-Z | 4.5V–36V input, 0.8V–28V output, 2.5A, 3.5µA IQ, 2MHz, no integrated soft-start or PGOOD | Wider VIN range suits 24V industrial rails but lacks PGOOD and precise VFB accuracy (±2%) | Select for cost-sensitive 24V applications where system-level monitoring replaces PGOOD and ±2% VOUT is acceptable. |
Compared with TPS62840DRVR and MP2451DT-LF-Z, the LTC3624EDD#PBF uniquely balances 17V VIN capability, 3.5µA IQ, ±1% VFB accuracy, and integrated PGOOD - making it optimal for portable equipment requiring both wide input range and precision regulation.
Availability
LTC3624EDD#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, emergency radios, and portable medical sensors requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3624EDD#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 acquired Linear Technology in 2017 and maintains its legacy of high-performance power management ICs with rigorous testing and automotive-grade reliability standards.
The LTC3624 product line targets ultra-low-power, wide-input-voltage DC/DC conversion for portable and energy-harvesting applications where quiescent current and thermal performance are critical design constraints.
FAQ
What is the maximum input voltage rating for the LTC3624EDD#PBF?
The LTC3624EDD#PBF has an absolute maximum input voltage rating of 17V. Operation above this level risks permanent damage. Its overvoltage lockout activates at 19V (rising) with 500mV hysteresis, suspending switching until VIN drops below 18.5V. For reliable long-term operation, keep steady-state VIN ≤17V and transient spikes within the OVP margin.
How does the MODE/SYNC pin configure operating modes on the LTC3624EDD#PBF?
The MODE/SYNC pin on the LTC3624EDD#PBF selects among three modes: tie to INTVCC for Burst Mode (3.5µA IQ, 800mA clamp), ground for pulse-skipping (lowest ripple), or apply 1.0V–2.4V for forced continuous (fixed 1MHz, zero-load capable). It also accepts external clocks within ±40% of 1MHz for synchronization - no external components needed.
Does the LTC3624EDD#PBF require external compensation components?
No, the LTC3624EDD#PBF features internal compensation, eliminating the need for external RC networks. This simplifies layout, reduces BOM count, and guarantees stability across its specified operating range (2.7V–17V input, 0.6V–VIN output, 2A load) when using recommended ceramic input/output capacitors and inductors.
What is the purpose of the exposed thermal pad (Pin 9) on the LTC3624EDD#PBF DFN package?
The exposed pad (Pin 9) on the LTC3624EDD#PBF is electrically and thermally connected to GND. It must be soldered to a PCB copper pour to achieve the specified θJA = 43°C/W and prevent thermal shutdown under 2A load. Leaving it unconnected degrades thermal performance by >30°C and violates Absolute Maximum Ratings.
Can the LTC3624EDD#PBF regulate output voltage when input voltage drops close to the output level?
Yes, the LTC3624EDD#PBF supports 100% duty cycle operation, maintaining regulation down to VIN ≈ VOUT + 0.1V. In dropout, the PMOS switch remains fully enhanced, and the device continues regulating with ultralow IQ in Burst Mode - essential for extending runtime in battery-depleted states.
LTC3624EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN 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:
- 2A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC3624EDD#PBF FAQ
1.How can I place an order for LTC3624EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624EDD#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 LTC3624EDD#PBF reliable?
The price and inventory of LTC3624EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3624EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3624EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624EDD#PBF?
LTC3624EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624EDD#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 LTC3624EDD#PBF?
For technical support, including LTC3624EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624EDD#PBF requirements.
6.How does Aetrix verify that LTC3624EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3624EDD#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 LTC3624EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3624EDD#PBF?
All LTC3624EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624EDD#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 LTC3624EDD#PBF part is unused and in its original packaging.
Return procedure for LTC3624EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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