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Analog Devices Inc. LTC3624EDD-2#PBF
- Part No.:
- LTC3624EDD-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3624EDD-2#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:131
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Product details
Overview
LTC3624EDD-2#PBF from Analog Devices (formerly Linear Technology) is a 17V, 2A synchronous step-down regulator in an 8-lead 3mm × 3mm DFN package, featuring 2.25MHz fixed switching frequency, 3.5µA quiescent current in shutdown, and adjustable 0.6V–VIN output voltage - deployed in battery-powered instrumentation and emergency radios requiring ultra-low IQ and compact footprint.
For engineers reviewing the LTC3624EDD-2#PBF datasheet, LTC3624EDD-2#PBF pinout, LTC3624EDD-2#PBF application, or LTC3624EDD-2#PBF equivalent, key selection criteria include its 2.25MHz operation enabling small external components, ±1% output voltage accuracy over temperature, Burst Mode®/pulse-skipping mode flexibility, and thermal performance with exposed pad soldering.
Technical Context
The LTC3624EDD-2#PBF uses constant-frequency peak current mode control with internal compensation and soft-start. Its 2.25MHz oscillator supports ±40% synchronization range via MODE/SYNC pin, enabling EMI reduction in noise-sensitive systems.
It integrates PMOS high-side and NMOS low-side power switches with 200mΩ and 115mΩ on-resistances respectively at VIN = 5V, and features overtemperature protection, VIN overvoltage lockout (19V), and undervoltage lockout (2.7V), ensuring robust operation across industrial ambient conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide-input applications including 12V automotive rails and multi-cell Li-ion batteries. |
| Output Voltage Range | 0.6V to VIN - enables precise regulation down to sub-1V logic supplies without external reference. |
| Switching Frequency | 2.25MHz (±40% sync range) - allows use of <3.3µH inductors and 4.7µF ceramic output caps for space-constrained designs. |
| Quiescent Current | 3.5µA in shutdown, 1.8mA typical in forced continuous mode - extends battery life in always-on sensor nodes. |
| Output Accuracy | ±1% over –40°C to 125°C - ensures stable voltage for ADC references and precision analog circuitry. |
| Peak Current Limit | 2.4A (E-grade), 2.3A (H-grade) - provides reliable short-circuit protection while sustaining 2A continuous load. |
| Thermal Shutdown | Active at TJ > 150°C (H-grade), 125°C (E-grade) - protects against sustained overload in sealed enclosures. |
Pinout & Package
Package: 8-Lead (3mm × 3mm) Plastic DFN with exposed thermal pad (Pin 9 = GND). Requires soldering of exposed pad to PCB ground plane for rated θJA = 43°C/W and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt square wave - must be routed with minimal loop area to reduce EMI. |
| VIN (Pin 2) | Main input supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and high-side switch - requires local 10µF ceramic bypass. |
| RUN (Pin 3) | Enable control | Logic-high (>0.35V) enables regulation; tied low disables converter and reduces IQ to 0.1µA. |
| PGOOD (Pin 4) | Power-good indicator | Open-drain output pulled low if VOUT deviates >±7.5%; includes 32-cycle blanking to suppress transient glitches. |
| FB (Pin 5) | Feedback input | Senses resistor divider output; regulates VOUT = 0.6V × (1 + R2/R1); connects directly to VOUT for fixed-output variants. |
| INTVCC (Pin 6) | Internal LDO output | 3.6V regulated supply for gate drivers and logic - bypass with ≥2.2µF ceramic to GND. |
| MODE/SYNC (Pin 7) | Operating mode select / clock sync | Tied to INTVCC → Burst Mode (800mA clamp); to GND → pulse-skipping; 1V–(VINTVCC–1.2V) → forced continuous; external clock → sync. |
| GND (Pins 8 & 9) | Signal and power ground | Pins 8 (top-side) and 9 (exposed pad) are internally connected - pad must be soldered for thermal and electrical performance. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces IQ to 3.5µA at light loads while maintaining regulation - critical for multi-year battery life in IoT sensors. |
| 2.25MHz fixed frequency | Enables use of tiny 2.2µH inductors and 4.7µF ceramic capacitors - shrinks total solution size by >40% vs 1MHz alternatives. |
| 100% duty cycle dropout | Maintains regulation down to VIN ≈ VOUT with ultralow IQ - supports brownout operation in backup power systems. |
| Internal soft-start | 1ms monotonic ramp prevents inrush current and output overshoot during startup - eliminates need for external timing components. |
| Overvoltage lockout | Shuts down at VIN > 19V and resumes at 18.5V - protects internal MOSFETs from transients on unregulated 12V/24V rails. |
Applications
| Battery-Powered Instrumentation | Emergency Radios |
|---|---|
Use Scenario: Portable multimeters and handheld oscilloscopes operating from two AA cells (2.4V–3.2V) with 3.3V digital core and 1.8V analog front-end. IC Role / Device Role / Timing Role: Primary DC/DC regulator delivering 2A peak to mixed-signal SoC with dynamic load steps. Use Value: 3.5µA shutdown IQ preserves battery shelf life; 2.25MHz operation minimizes inductor height for slim form factor. | Use Scenario: Hand-crank or solar-charged emergency AM/FM radios requiring stable 5V supply under variable input (3V–15V). IC Role / Device Role / Timing Role: Input-wide buck converter powering RF amplifier, audio codec, and microcontroller from hybrid energy source. Use Value: 2.7V–17V input range accommodates cranking voltage dips and solar panel open-circuit spikes; PGOOD enables safe system reset. |
| Portable Medical Sensors | Industrial Control Nodes |
Use Scenario: Wearable ECG monitors using coin-cell battery (3V) with 1.2V analog signal chain and BLE radio (3.3V). IC Role / Device Role / Timing Role: Dual-output supply generator (via cascaded regulators) with tight load-transient response. Use Value: ±1% output accuracy ensures ADC reference stability; current-mode control delivers <50µs recovery from 100mA load steps. | Use Scenario: DIN-rail mounted PLC I/O modules powered from 24V rail, generating isolated 5V/3.3V supplies for microcontrollers and sensors. IC Role / Device Role / Timing Role: Pre-regulator stepping 24V down to 5V before isolation stage - handles high ambient temperature and vibration. Use Value: Exposed-pad DFN package achieves 43°C/W θJA for reliable operation at 70°C ambient; H-grade option supports 150°C junction limit. |
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 |
|---|---|---|---|
| TPS62864DLCR | 2.4V–5.5V input, 2.25MHz, 3A output, 1.2µA IQ - narrower VIN range, higher current rating, no SYNC capability. | Best suited for single-cell Li-ion (3.0V–4.2V) portable devices, not wide-input industrial or automotive use. | Select when input is tightly regulated ≤5.5V and 3A output is required; avoid for 12V/24V or battery-depleted scenarios. |
| MP2451DT-LF-Z | 4.5V–28V input, 2MHz, 2A output, 260µA IQ - wider VIN, higher IQ, no Burst Mode or PGOOD. | Targeted at cost-sensitive industrial supplies where ultra-low IQ is not mandatory and monitoring is handled externally. | Choose for 24V systems needing ruggedness over battery life; verify external supervision replaces missing PGOOD and soft-start. |
Compared with TPS62864DLCR and MP2451DT-LF-Z, the LTC3624EDD-2#PBF uniquely combines 2.7V–17V input, 3.5µA shutdown IQ, integrated PGOOD, and 2.25MHz sync capability - making it optimal for battery-backed instrumentation where size, efficiency, and reliability are co-prioritized.
Availability
LTC3624EDD-2#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, emergency radios, and portable medical sensors requiring stable component supply with long-term lifecycle support.
Supply support for LTC3624EDD-2#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 qualification standards for industrial and aerospace applications.
The LTC3624 series was designed specifically for ultra-low-power, wide-input synchronous buck conversion in space- and energy-constrained portable electronics - emphasizing quiescent current, thermal efficiency, and ease of layout.
FAQ
What is the maximum input voltage rating for the LTC3624EDD-2#PBF?
The LTC3624EDD-2#PBF has an absolute maximum input voltage rating of 17V. Operation above this level risks permanent damage. Its VIN overvoltage lockout activates at 19V (with 500mV hysteresis), suspending switching until VIN drops below 18.5V - a safety feature protecting internal MOSFETs during transients. Always ensure input filtering limits spikes within this margin. The LTC3624EDD-2#PBF is rated for continuous operation up to 17V.
Does the LTC3624EDD-2#PBF support external frequency synchronization?
Yes, the LTC3624EDD-2#PBF supports external frequency synchronization via the MODE/SYNC pin. It accepts an external clock within ±40% of its nominal 2.25MHz frequency (i.e., 1.35MHz to 3.15MHz). Sync engagement occurs within 2–3 cycles; loss of clock is detected after ~2µs. This capability enables EMI reduction by aligning switching edges with system clocks or avoiding sensitive frequency bands. The LTC3624EDD-2#PBF enters forced continuous mode during sync.
How does the MODE/SYNC pin configure operating modes on the LTC3624EDD-2#PBF?
The MODE/SYNC pin configures three distinct operating modes on the LTC3624EDD-2#PBF: tie to INTVCC for Burst Mode® (800mA peak clamp, lowest IQ); ground for pulse-skipping (lowest ripple); or apply 1V–(VINTVCC–1.2V) for forced continuous mode (best transient response). It also accepts external clocks for synchronization. Each configuration directly alters control-loop behavior - not just a logic select - and is validated across temperature and load. The LTC3624EDD-2#PBF's datasheet specifies exact voltage thresholds and resulting performance trade-offs.
What is the thermal performance of the LTC3624EDD-2#PBF in its DFN package?
The LTC3624EDD-2#PBF in the 8-lead 3mm × 3mm DFN package has θJA = 43°C/W and θJC = 5.5°C/W when the exposed pad (Pin 9) is soldered to a minimum 1cm² PCB copper area. Junction temperature must stay ≤125°C for E-grade operation. At 2A load and 12V input, typical power dissipation is ~0.4W; with proper layout, this yields ~55°C rise above ambient. Thermal derating is required above 70°C ambient. The LTC3624EDD-2#PBF's exposed pad is electrically GND and thermally critical - omitting soldering violates both thermal and electrical specs.
Can the LTC3624EDD-2#PBF regulate output voltage below 1V?
Yes, the LTC3624EDD-2#PBF supports output voltages as low as 0.6V via the FB pin and external resistor divider (VOUT = 0.6V × [1 + R2/R1]). Its 0.6V internal reference is trimmed to ±1% over –40°C to 125°C, enabling accurate sub-1V regulation for modern low-voltage processors and FPGAs. Fixed-output variants (e.g., LTC3624EDD-23.3#PBF) are not adjustable, but the LTC3624EDD-2#PBF itself is fully adjustable down to 0.6V with appropriate resistor selection and layout attention to FB node noise immunity.
LTC3624EDD-2#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:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC3624EDD-2#PBF FAQ
1.How can I place an order for LTC3624EDD-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624EDD-2#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-2#PBF reliable?
The price and inventory of LTC3624EDD-2#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-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3624EDD-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624EDD-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624EDD-2#PBF?
LTC3624EDD-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624EDD-2#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-2#PBF?
For technical support, including LTC3624EDD-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624EDD-2#PBF requirements.
6.How does Aetrix verify that LTC3624EDD-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3624EDD-2#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-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3624EDD-2#PBF?
All LTC3624EDD-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624EDD-2#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-2#PBF part is unused and in its original packaging.
Return procedure for LTC3624EDD-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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