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Analog Devices Inc. LTC3624EDD-5#PBF
- Part No.:
- LTC3624EDD-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3624EDD-5#PBF.pdf
- Description:
- IC REG BUCK 5V 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:525
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Product details
Overview
LTC3624EDD-5#PBF from Analog Devices (formerly Linear Technology) is a 17V, 2A synchronous step-down regulator in an 8-lead 3mm × 3mm DFN package, delivering a fixed 5V output with ±1% accuracy, 1MHz switching frequency, and 3.5µA quiescent current in Burst Mode - ideal for battery-powered instrumentation and emergency radios requiring ultra-low standby power.
For engineers reviewing the LTC3624EDD-5#PBF datasheet, LTC3624EDD-5#PBF pinout, LTC3624EDD-5#PBF application, or LTC3624EDD-5#PBF equivalent, key selection criteria include its fixed 5V output, 1MHz constant-frequency operation, ultralow IQ in shutdown (0.1µA), 100% duty-cycle dropout capability, and compatibility with ceramic input/output capacitors in space-constrained portable designs.
Technical Context
The LTC3624EDD-5#PBF uses peak current mode control with internal compensation and a 1MHz fixed oscillator, supporting synchronization to an external clock within ±40% range. Its MODE/SYNC pin enables selection among Burst Mode (3.5µA IQ), pulse-skipping (low ripple), or forced continuous operation.
It integrates PMOS/NMOS power switches with 200mΩ/115mΩ RDS(ON), features overtemperature protection, VIN overvoltage lockout (19V), and a precision 0.6V feedback reference. The FB pin is internally connected to VOUT for fixed-output operation, eliminating external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% - eliminates need for external feedback divider; ensures stable logic supply for microcontrollers and sensors. |
| Input Voltage Range | 2.7V to 17V - supports single-cell Li-ion (up to 4.2V), dual-cell alkaline (up to ~3.2V), and 12V industrial rails without pre-regulation. |
| Max Output Current | 2A continuous - sufficient to power FPGA I/O banks, RF transceivers, or multi-sensor modules from compact PCB layouts. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on monitoring devices; drops to 0.1µA in shutdown via RUN pin. |
| Switching Frequency | 1MHz (±8%) - enables use of small 2.2µH inductors and 4.7–10µF ceramic input capacitors, reducing solution footprint. |
| Efficiency Peak | 95% at 5V/1A (VIN = 12V) - minimizes thermal rise in sealed enclosures; maintains >85% efficiency down to 10mA load in Burst Mode. |
| Thermal Performance | θJA = 43°C/W (DFN) - requires exposed pad soldered to PCB ground plane; supports full 2A load at +85°C ambient with minimal heatsinking. |
Pinout & Package
Package: 8-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 9 = GND). Requires soldering of exposed pad to PCB ground for electrical integrity and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection to inductor; carries high di/dt square wave - must be routed short and wide to minimize EMI and voltage spikes. |
| VIN (Pins 2,3) | Main input supply | Accepts 2.7–17V; powers internal LDO (INTVCC) and high-side PMOS gate drive - bypass with ≥10µF ceramic capacitor close to pin. |
| RUN (Pin 5) | Enable control | Active-high logic input; <0.35V disables regulator and reduces IQ to 0.1µA - compatible with MCU GPIO or system power sequencer. |
| PGOOD (Pin 6) | Power good indicator | Open-drain output pulled low if VOUT deviates >±7.5% from 5V; includes 32-cycle blanking to suppress transient glitches. |
| FB (Pin 8) | Feedback reference | Internally tied to VOUT for fixed 5V operation - no external resistor divider required; simplifies layout and improves accuracy. |
| INTVCC (Pin 9) | Internal LDO output | 3.6V regulated supply for gate drivers and logic - bypass with ≥2.2µF ceramic capacitor to GND for stability. |
| MODE/SYNC (Pin 10) | Operating mode select | Tie to INTVCC for Burst Mode (ultra-low IQ), GND for pulse-skipping (low ripple), or external clock for synchronization. |
| GND (Pins 11,12 + Exposed Pad) | Signal & power ground | Low-impedance return path for SW node, VIN decoupling, and thermal conduction - exposed pad must be soldered to ≥1cm² copper pour. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces IQ to 3.5µA at light loads while maintaining regulation - extends battery runtime in intermittent-sensing applications. |
| 100% duty cycle dropout | Enables regulation down to VOUT = VIN (e.g., 5V out from 5.5V input) with ultralow IQ - critical for end-of-battery-life operation. |
| Integrated soft-start | 1ms internal ramp prevents inrush current and output overshoot during power-up - eliminates need for external timing components. |
| Overvoltage lockout | Shuts down regulator if VIN exceeds 19V and resumes automatically at 18.5V - protects internal MOSFETs from transient surges on 12V rails. |
| Current-mode control | Provides inherent cycle-by-cycle current limiting and fast transient response (<10µs recovery from 1A load step) - stabilizes output under dynamic loads. |
Applications
| Battery-Powered Instrumentation | Emergency Radios |
|---|---|
Use Scenario: Portable multimeter or gas detector operating from two AA alkaline cells (1.8–3.2V) with LCD, sensor interface, and BLE radio. IC Role / Device Role / Timing Role: Primary 5V system supply regulating from variable battery voltage; provides clean, stable rail for analog front-end and digital subsystems. Use Value: 3.5µA Burst Mode IQ extends battery life to >1 year in sleep mode; 100% duty cycle maintains 5V output until battery drops below 5V. | Use Scenario: Hand-crank or solar-charged emergency AM/FM radio with microcontroller, audio amplifier, and LED display. IC Role / Device Role / Timing Role: Fixed 5V supply for MCU, tuner IC, and audio codec; handles wide input variation from charging circuitry (3–17V). Use Value: 95% peak efficiency minimizes heat in sealed enclosure; PGOOD signal enables firmware-controlled low-battery warning. |
| General Purpose Step-Down Supplies | Portable Medical Sensors |
Use Scenario: Industrial handheld tester requiring reliable 5V rail from diverse sources (USB, LiPo, or 12V adapter). IC Role / Device Role / Timing Role: Compact, robust DC/DC converter replacing linear regulators; delivers 2A with minimal board area and thermal management. Use Value: DFN package and ceramic capacitor compatibility reduce BOM count; SYNC pin allows noise-sensitive systems to align switching to quiet periods. | Use Scenario: Wearable pulse oximeter powered by coin cell (2.0–3.0V) with optical sensor, ADC, and Bluetooth LE. IC Role / Device Role / Timing Role: Efficient 5V boost+regulation stage (with upstream boost) enabling high-current LED pulses and low-noise analog acquisition. Use Value: Low 60ns minimum on-time supports high VIN/VOUT ratios; ±1% VOUT accuracy ensures consistent LED drive and ADC reference stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62865RQYR | Fixed 5V, 2.5A, 2.5MHz, 1.2µA IQ - higher frequency, lower IQ, but requires external compensation and has no SYNC pin. | Better suited for ultra-thin wearables needing smallest inductor; lacks PGOOD and overvoltage protection. | Choose TPS62865RQYR only if 2.5MHz operation and sub-2µA IQ outweigh loss of fault protection and design simplicity. |
| MP2451DT-LF-Z | Adjustable 0.8–15V, 2A, 2MHz, 260µA IQ - no fixed 5V option, higher IQ, no Burst Mode, but offers wider VOUT adjustability. | Requires external feedback resistors; suitable where programmable output or cost sensitivity outweighs IQ and feature requirements. | Choose MP2451DT-LF-Z only when adjustable output is mandatory and 260µA IQ is acceptable for battery life targets. |
Compared with TPS62865RQYR and MP2451DT-LF-Z, the LTC3624EDD-5#PBF uniquely combines fixed 5V accuracy, 3.5µA Burst Mode IQ, integrated PGOOD, and ±40% frequency sync - making it optimal for battery-critical, safety-aware, and noise-sensitive portable instrumentation.
Availability
LTC3624EDD-5#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, emergency radios, and portable medical sensors requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3624EDD-5#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 high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3624 series was designed specifically for ultra-low-power, wide-input-voltage step-down regulation in portable and energy-harvesting systems - emphasizing quiescent current optimization, small solution size, and robust fault protection.
FAQ
What is the output voltage tolerance of the LTC3624EDD-5#PBF?
The LTC3624EDD-5#PBF delivers 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 TJ = –40°C to 125°C). This tight tolerance eliminates post-regulation LDOs in most 5V logic and analog applications.
Does the LTC3624EDD-5#PBF require external feedback resistors?
No. The LTC3624EDD-5#PBF is a fixed-output variant: its FB pin is internally connected to VOUT, so no external resistor divider is needed. This simplifies layout, improves accuracy by removing resistor tolerance errors, and reduces BOM count compared to adjustable versions like LTC3624EDD#PBF.
How does the MODE/SYNC pin function on the LTC3624EDD-5#PBF?
On the LTC3624EDD-5#PBF, the MODE/SYNC pin selects operating mode: tie to INTVCC for Burst Mode (3.5µA IQ), ground for pulse-skipping (lowest ripple), or apply an external clock (1MHz ±40%) for synchronization. It also enables forced continuous mode when biased between 1V and VINTVCC – 1.2V.
What thermal considerations apply to the LTC3624EDD-5#PBF in a 2A application?
The LTC3624EDD-5#PBF has θJA = 43°C/W in its 3mm × 3mm DFN package. At 2A/5V (10W output) with 12V input (≈87% efficiency), power dissipation is ~1.5W - resulting in ~65°C junction rise above ambient. Full thermal performance requires soldering the exposed pad to ≥1cm² PCB ground copper; derating is advised above +85°C ambient.
Is the LTC3624EDD-5#PBF RoHS-compliant and lead-free?
Yes. The "#PBF" suffix denotes lead-free finish per JEDEC J-STD-609, and the LTC3624EDD-5#PBF is RoHS-compliant and halogen-free. Its marking "LGRD" and packaging meet Analog Devices' standard lead-free manufacturing and shipping requirements.
LTC3624EDD-5#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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- 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-5#PBF FAQ
1.How can I place an order for LTC3624EDD-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624EDD-5#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-5#PBF reliable?
The price and inventory of LTC3624EDD-5#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-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC3624EDD-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624EDD-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624EDD-5#PBF?
LTC3624EDD-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624EDD-5#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-5#PBF?
For technical support, including LTC3624EDD-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624EDD-5#PBF requirements.
6.How does Aetrix verify that LTC3624EDD-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3624EDD-5#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-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC3624EDD-5#PBF?
All LTC3624EDD-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624EDD-5#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-5#PBF part is unused and in its original packaging.
Return procedure for LTC3624EDD-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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