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Analog Devices Inc. LTC3624IDD#PBF
- Part No.:
- LTC3624IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3624IDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:8,173
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Product details
Overview
LTC3624IDD#PBF from Analog Devices (formerly Linear Technology) is a 17V, 2A synchronous step-down DC/DC regulator with fixed 2.25MHz switching frequency, 3.5µA quiescent current in shutdown, adjustable 0.6V–VIN output, and internal compensation. It delivers high efficiency across wide load ranges in battery-powered instrumentation and portable radios.
For engineers reviewing the LTC3624IDD#PBF datasheet, LTC3624IDD#PBF pinout, LTC3624IDD#PBF application, or LTC3624IDD#PBF equivalent, key selection criteria include ultralow IQ operation, 2.25MHz sync capability, ±1% VFB accuracy, dropout support up to 100% duty cycle, and DFN-8 thermal performance with exposed pad grounding.
Technical Context
The LTC3624IDD#PBF uses constant-frequency peak current mode control with internal slope compensation for stable operation at high duty cycles. Its 2.25MHz oscillator supports ±40% external synchronization via the MODE/SYNC pin, enabling EMI reduction in dense layouts.
It integrates dual MOSFETs (PMOS high-side, NMOS low-side), a 0.6V reference error amplifier, soft-start ramp, overtemperature protection, and PGOOD monitoring with 32-cycle blanking delay. Mode selection (Burst, pulse-skipping, forced continuous) is controlled solely by the MODE/SYNC pin voltage level.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports single-cell Li-ion to 12V rail inputs without pre-regulation |
| Output Voltage Range | 0.6V to VIN - enables direct regulation from input down to sub-1V logic supplies |
| Max Output Current | 2A - sustained delivery with thermal derating per θJA = 43°C/W in DFN-8 package |
| Quiescent Current | 3.5µA in shutdown - extends battery life in always-on emergency radio standby |
| Feedback Voltage | 0.6V ±1% - sets output accuracy for adjustable configurations using resistor divider |
| Switching Frequency | 2.25MHz (±40% sync range) - allows compact 2.2µH inductors and reduces EMI fundamental |
| Peak Current Limit | 2.3A (I-grade) - ensures robust overload response without external sensing |
| PGOOD Threshold | ±7.5% of VOUT - provides reliable power sequencing signal with 32-cycle glitch immunity |
Pinout & Package
Package: 8-Lead (3mm × 3mm) Plastic DFN with exposed thermal pad (Pin 9), rated for –40°C to 125°C operating junction temperature. Exposed pad must be soldered to PCB ground for electrical integrity and thermal performance (θJC = 5.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Node | Connection point for external inductor; carries high dv/dt square wave - requires tight layout and Kelvin return |
| VIN (Pins 2,3) | Main Input Supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and high-side gate driver |
| RUN (Pin 4) | Enable Control | Active-high logic input; pulls low to disable regulator and reduce IQ to 0.1µA |
| PGOOD (Pin 5) | Power Good Indicator | Open-drain output with 280Ω pull-down; asserts high only when VOUT is within ±7.5% regulation window |
| FB (Pin 6) | Feedback Input | Senses resistor divider output; regulates VOUT = 0.6V × (1 + R2/R1); short to VOUT for fixed-output variants |
| INTVCC (Pin 7) | Internal LDO Output | 3.6V regulated supply for gate drivers and logic; bypass with ≥2.2µF ceramic capacitor to GND |
| MODE/SYNC (Pin 8) | Operating Mode Select | Voltage-controlled pin: tie to INTVCC for Burst Mode (3.5µA IQ), GND for pulse-skipping (low ripple), or 1V–2.4V for forced continuous mode |
| GND (Pins 8,9) | Signal & Power Ground | Common reference for all circuits; exposed pad (Pin 9) is mandatory GND connection for thermal and electrical performance |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow Shutdown IQ | 0.1µA - enables multi-year battery life in infrequently powered devices like emergency radios |
| 100% Duty Cycle Operation | Supports dropout down to VIN – VOUT < 100mV - maintains regulation during brownout without external LDO |
| Internal Compensation | Eliminates external compensation network - reduces BOM count and layout sensitivity for fast design turnarounds |
| Soft-Start Ramp | 1ms internal ramp - prevents inrush current and output overshoot during power-up |
| Overtemperature Protection | Thermal shutdown at TJ > 125°C - protects against sustained overload or poor heatsinking without external circuitry |
| Sync-Capable Oscillator | ±40% capture range - allows EMI spreading or synchronization to system clock for noise-sensitive applications |
Applications
| Battery-Powered Instrumentation | Emergency Radios |
|---|---|
Use Scenario: Portable multimeter or handheld oscilloscope operating from two AA cells (1.8V–3.2V) with 3.3V digital core and 1.8V analog front-end. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 2A at 3.3V from variable input; manages light-load efficiency via Burst Mode. Use Value: 3.5µA shutdown IQ extends shelf life beyond 5 years; 2.25MHz switching enables use of tiny 2.2µH inductors for compact form factor. | Use Scenario: Hand-crank or solar-charged emergency AM/FM radio requiring reliable 5V USB output and 3.3V microcontroller supply under intermittent input. IC Role / Device Role / Timing Role: Dual-output buck converter (via cascaded stages) providing stable 5V and 3.3V rails with automatic dropout handling. Use Value: 100% duty cycle operation sustains 3.3V output down to 3.4V input; PGOOD enables safe microcontroller wake-up after power restoration. |
| General Purpose Step-Down Supplies | Portable Medical Sensors |
Use Scenario: Industrial IoT node with 12V input powering 5V MCU, 3.3V sensors, and 1.2V FPGA core - requiring clean, efficient conversion. IC Role / Device Role / Timing Role: High-efficiency primary regulator feeding secondary LDOs; operates in pulse-skipping mode to minimize output ripple on analog sensor rails. Use Value: ±1% VFB accuracy ensures precise 5V/3.3V generation; 2.25MHz sync eliminates beat frequencies with wireless transceivers. | Use Scenario: Wearable ECG patch with coin-cell battery (2.5V–3.0V) powering ultra-low-noise analog front-end and Bluetooth LE radio. IC Role / Device Role / Timing Role: Single-stage buck supplying 1.8V analog domain; configured in forced continuous mode to suppress switching noise near sensitive amplifiers. Use Value: Internal slope compensation maintains stability at >90% duty cycle; low ESR ceramic output cap compatibility minimizes noise coupling into analog signal path. |
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 |
|---|---|---|---|
| TPS62840DLCR | 1.8V–6.5V input, 0.6V–5.5V output, 1.4A max, 300nA IQ in shutdown, 2.25MHz fixed | Lower input voltage ceiling limits use in 12V systems; superior IQ benefits ultra-long-life coin-cell designs | Select when input is ≤6.5V and sub-1µA shutdown IQ is critical; not suitable for 12V/17V industrial inputs |
| MP2451DT-LF-Z | 4.5V–36V input, 0.8V–25V output, 0.6A max, 2.2MHz fixed, no sync, 25µA IQ | Higher voltage rating but lower current and IQ; lacks MODE/SYNC flexibility and PGOOD | Choose for cost-sensitive 24V industrial supplies where 0.6A suffices and advanced light-load modes are unnecessary |
Compared with TPS62840DLCR and MP2451DT-LF-Z, the LTC3624IDD#PBF uniquely combines 17V input tolerance, 2A output, 3.5µA shutdown IQ, and full MODE/SYNC configurability - making it optimal for portable equipment requiring wide VIN, high current, and adaptive efficiency modes.
Availability
LTC3624IDD#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, emergency radios, and general-purpose step-down supplies requiring stable component supply, long-lifecycle assurance, and guaranteed parametric compliance.
Supply support for LTC3624IDD#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 precision power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3624 series targets high-efficiency, low-quiescent-current DC/DC conversion in space-constrained portable and battery-critical applications - emphasizing ultralow IQ, wide input range, and flexible light-load operation.
FAQ
What is the maximum input voltage rating for the LTC3624IDD#PBF?
The LTC3624IDD#PBF has an absolute maximum VIN rating of 17V. Operation above this voltage risks permanent damage. The device includes VIN overvoltage lockout that suspends switching when VIN exceeds 19V and resumes at 18.5V, protecting internal MOSFETs during transients. For continuous operation, keep VIN ≤17V as specified in the Absolute Maximum Ratings table.
How does the MODE/SYNC pin configure operating modes on the LTC3624IDD#PBF?
The MODE/SYNC pin on the LTC3624IDD#PBF selects three distinct operating modes: tie to INTVCC for Burst Mode (3.5µA IQ, 800mA peak clamp), ground for pulse-skipping (lowest ripple), or apply 1.0V–2.4V for forced continuous mode. It also accepts external clocks within ±40% of 2.25MHz to synchronize switching and reduce EMI. The pin draws <100nA, minimizing mode-control overhead.
Can the LTC3624IDD#PBF operate in 100% duty cycle dropout mode?
Yes, the LTC3624IDD#PBF supports true 100% duty cycle operation, maintaining regulation when VIN approaches VOUT. In dropout, the PMOS high-side switch remains fully enhanced, delivering current without switching losses. This capability is active in all modes (Burst, pulse-skipping, forced continuous) and is enabled by internal circuitry that preserves peak current limit accuracy even at high duty cycles.
What is the purpose of the exposed thermal pad on the LTC3624IDD#PBF DFN package?
The exposed thermal pad (Pin 9) on the LTC3624IDD#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 θJC = 5.5°C/W. Omitting this connection degrades thermal performance significantly, risking thermal shutdown under 2A load and compromising long-term reliability. The pad also serves as the primary signal ground return path.
Does the LTC3624IDD#PBF require external compensation components?
No, the LTC3624IDD#PBF features fully internal compensation - no external capacitors or resistors are needed for loop stability. This simplifies design, reduces BOM count, and eliminates layout sensitivity associated with compensation networks. The internal compensation is optimized for standard 2.2µH inductors and ceramic output capacitors, supporting stable operation across the full 0.6V–VIN output range.
LTC3624IDD#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)
LTC3624IDD#PBF FAQ
1.How can I place an order for LTC3624IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624IDD#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 LTC3624IDD#PBF reliable?
The price and inventory of LTC3624IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3624IDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3624IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624IDD#PBF?
LTC3624IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624IDD#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 LTC3624IDD#PBF?
For technical support, including LTC3624IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624IDD#PBF requirements.
6.How does Aetrix verify that LTC3624IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3624IDD#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 LTC3624IDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3624IDD#PBF?
All LTC3624IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624IDD#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 LTC3624IDD#PBF part is unused and in its original packaging.
Return procedure for LTC3624IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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