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Analog Devices Inc. LTC3624IDD-23.3#PBF
- Part No.:
- LTC3624IDD-23.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3624IDD-23.3#PBF.pdf
- Description:
- IC REG BUCK 3.3V 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,988
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Product details
Overview
LTC3624IDD-23.3#PBF 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 in Burst Mode operation. It operates from 2.7V to 17V input, supports 100% duty cycle for low-dropout operation, and maintains ±1% output voltage accuracy over temperature and load. It is used in battery-powered portable instrumentation requiring high light-load efficiency and compact power conversion.
For engineers reviewing the LTC3624IDD-23.3#PBF datasheet, LTC3624IDD-23.3#PBF pinout, LTC3624IDD-23.3#PBF application, or LTC3624IDD-23.3#PBF equivalent, key selection considerations include its 2.25MHz switching frequency for small external components, fixed 3.3V output eliminating feedback resistor network, ultralow IQ for extended battery life, and integrated soft-start and overtemperature protection.
Technical Context
The LTC3624IDD-23.3#PBF implements a constant-frequency peak current mode control architecture with internal compensation, enabling stable regulation across wide input (2.7V–17V) and load (0–2A) ranges. Its 2.25MHz oscillator allows use of sub-3.3µH inductors and low-ESR ceramic capacitors while maintaining tight transient response.
It features three selectable operating modes via the MODE/SYNC pin: Burst Mode (3.5µA IQ), pulse-skipping (low VOUT ripple), and forced continuous (fixed-frequency operation). The device integrates both PMOS high-side and NMOS low-side power switches with 200mΩ/115mΩ RDS(ON), and includes internal 1ms soft-start, PGOOD monitoring with ±7.5% window, and VIN overvoltage lockout at 19V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% over –40°C to 125°C junction temperature - eliminates external feedback divider and simplifies layout. |
| Switching Frequency | 2.25MHz ±20% (E/I-grade) - enables compact 2.2µH inductor and 4.7µF–22µF ceramic output capacitor solutions. |
| Quiescent Current | 3.5µA in Burst Mode - extends runtime in always-on battery systems such as emergency radios and portable sensors. |
| Input Voltage Range | 2.7V to 17V - supports single-cell Li-ion (3.0–4.2V), dual-cell alkaline (2.4–3.2V), and 12V industrial rails. |
| Output Current | Up to 2A continuous - sufficient for powering microcontrollers, RF transceivers, and analog front-ends. |
| Efficiency Peak | 95% at 5VIN/3.3VOUT, 1A load - minimizes thermal rise in sealed enclosures and reduces heatsinking needs. |
| Thermal Shutdown | Activates at TJ = 150°C - protects against sustained overload or poor PCB thermal design without external circuitry. |
Pinout & Package
Package: 8-Lead (3mm × 3mm) Plastic DFN with exposed pad (Pin 9 = GND). Requires soldering of exposed pad to PCB ground plane for rated thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Node | Connection point for external inductor; carries high di/dt square-wave current - must be routed with minimal loop area. |
| VIN (Pin 2) | Input Supply | Primary power input (2.7V–17V); requires local 10µF ceramic bypass capacitor placed adjacent to pin. |
| RUN (Pin 3) | Enable Control | Active-high logic input; pull low to disable regulator and reduce input current to 0.1µA shutdown level. |
| PGOOD (Pin 4) | Power Good Output | Open-drain signal pulled low if VOUT deviates >±7.5% - provides system-level power sequencing and fault detection. |
| FB (Pin 5) | Feedback Input | Internally tied to 3.3V output - no external resistors required; unused in fixed-output configuration. |
| INTVCC (Pin 6) | Bias LDO Output | 3.6V internal LDO supply for gate drivers; bypass with ≥2.2µF ceramic capacitor to GND for stability. |
| MODE/SYNC (Pin 7) | Operating Mode Select | Configures Burst Mode (tie to INTVCC), pulse-skipping (tie to GND), or forced continuous/sync (apply 1V–VINTVCC–1.2V). |
| GND (Pins 8 & 9) | Signal & Power Ground | Pins 8 and 9 (exposed pad) are internally connected - pad must be soldered to solid GND plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow Quiescent Current | 3.5µA in Burst Mode enables >1-year battery life in 10µA average-load IoT sensors. |
| Fixed 3.3V Output | Eliminates FB resistor network, reducing BOM count, layout area, and potential divider drift errors. |
| 2.25MHz Switching | Permits use of 2.2µH inductors and <22µF ceramic output caps - ideal for space-constrained portable designs. |
| 100% Duty Cycle Operation | Maintains regulation down to VIN = VOUT (3.3V), supporting brownout resilience in Li-ion discharge profiles. |
| Integrated Soft-Start | 1ms internal ramp prevents inrush current and output overshoot during power-up without external components. |
| Overtemperature Protection | Thermal shutdown at 150°C junction temperature - safeguards against PCB thermal design flaws or airflow loss. |
Applications
| Battery-Powered Portable Instrumentation | Emergency Radios |
|---|---|
Use Scenario: Handheld multimeters, portable oscilloscopes, and field-deployable gas analyzers powered by 2xAA or Li-ion batteries. IC Role / Device Role / Timing Role: Primary 3.3V system rail regulator supplying MCU, ADC, display driver, and wireless interface. Use Value: 3.5µA quiescent current extends shelf-life and operational runtime; 2.25MHz switching minimizes solution size for handheld ergonomics. |
Use Scenario: Self-contained emergency communication devices with long-term storage requirements and intermittent transmit bursts. IC Role / Device Role / Timing Role: Main 3.3V supply for Si4463 transceiver, ARM Cortex-M0+ MCU, and audio codec during receive/transmit cycles. Use Value: Burst Mode operation draws only 3.5µA between transmissions; 100% duty cycle sustains output during Li-ion voltage decay below 3.6V. |
| Low-Power Industrial Sensors | Wearable Health Monitors |
Use Scenario: Battery-operated vibration, temperature, and pressure sensors deployed in remote industrial sites with 5+ year maintenance intervals. IC Role / Device Role / Timing Role: Efficient 3.3V conversion from primary 3.6V Li-SOCl₂ cell, powering ultra-low-power MCU and BLE radio during periodic wake-ups. Use Value: 95% peak efficiency at 1mA load preserves battery capacity; ±1% VOUT accuracy ensures consistent ADC reference and sensor biasing. |
Use Scenario: Clinical-grade pulse oximeters and ECG patches worn continuously for 72+ hours on a single coin-cell battery. IC Role / Device Role / Timing Role: Regulated 3.3V supply for optical sensor array, analog front-end, and Bluetooth LE SoC during active measurement and sleep states. Use Value: Fixed 3.3V output removes calibration dependency on external resistors; 2.25MHz operation enables miniature 1.6×1.6mm inductor integration. |
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 | 2.4V–6V input range; 0.6µA IQ; 1.8V–5.5V adjustable output; 2.25MHz switching - lacks 17V rating and fixed 3.3V option. | Suitable only for single-cell Li-ion or 3.3V rail generation from lower VIN; not viable for 12V input or wide-VIN legacy systems. | Select when ultra-low IQ (<1µA) is critical and input never exceeds 6V; requires external feedback resistors for 3.3V. |
| MAX17552ATP+ | 4.5V–60V input; 2A output; 1.2MHz switching; 100µA IQ - higher IQ, wider VIN, but larger solution size and no fixed 3.3V variant. | Designed for industrial 24V/48V rails; unsuitable for battery-powered portables due to IQ and minimum VIN limitation. | Choose for high-input-voltage industrial systems where 17V max is insufficient; accept higher IQ and added external components. |
Compared with TPS62840DLCR and MAX17552ATP+, the LTC3624IDD-23.3#PBF uniquely balances 17V input capability, fixed 3.3V output, 2.25MHz frequency, and 3.5µA IQ - making it optimal for compact, long-life portable equipment operating from diverse battery chemistries.
Availability
LTC3624IDD-23.3#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, emergency communication devices, and low-power industrial sensors requiring stable component supply, long-lifecycle support, and guaranteed parametric performance across –40°C to 125°C.
Supply support for LTC3624IDD-23.3#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 full product support, datasheets, and application engineering for the LTC portfolio. Linear's legacy focus on precision power and signal conditioning remains central to ADI's high-performance analog roadmap.
The LTC3624 series was designed specifically for space- and energy-constrained portable electronics needing high-efficiency, ultralow-IQ DC/DC conversion with minimal external components - targeting medical, test equipment, and ruggedized communications markets.
FAQ
What is the maximum input voltage rating for the LTC3624IDD-23.3#PBF?
The LTC3624IDD-23.3#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 12V rail applications, this provides robust transient immunity without external clamping.
Does the LTC3624IDD-23.3#PBF require external feedback resistors to set its output voltage?
No. The LTC3624IDD-23.3#PBF is a fixed 3.3V output variant - the FB pin is internally connected to the regulated output, eliminating the need for external resistors. This reduces BOM cost, saves PCB area, and avoids tolerance-induced output error. External resistors are only required for adjustable versions like the LTC3624IDD-2#PBF.
How does the MODE/SYNC pin configure operating modes on the LTC3624IDD-23.3#PBF?
The MODE/SYNC pin selects among three modes: tie to INTVCC for Burst Mode (3.5µA IQ), tie to GND for pulse-skipping (lowest VOUT ripple), or apply 1.0V–2.4V for forced continuous mode or external clock synchronization. In all cases, the LTC3624IDD-23.3#PBF maintains its 2.25MHz base frequency unless synced to an external source within ±40% range.
What thermal performance can be expected from the LTC3624IDD-23.3#PBF in a standard 4-layer PCB layout?
With the exposed pad (Pin 9) soldered to a 250mm² internal GND plane using 4 thermal vias, the LTC3624IDD-23.3#PBF achieves θJA ≈ 43°C/W. At 2A load and 12VIN/3.3VOUT, power dissipation is ~1.7W, resulting in ~73°C junction rise above ambient - well within its –40°C to 125°C operating range. No heatsink is required under these conditions.
Is the LTC3624IDD-23.3#PBF RoHS-compliant and lead-free?
Yes. The "#PBF" suffix explicitly denotes lead-free finish per JEDEC J-STD-609. The LTC3624IDD-23.3#PBF meets RoHS Directive 2011/65/EU and is compatible with standard Pb-free reflow profiles (peak 260°C). Its marking "LGRH" and DFN package are fully documented in Analog Devices' lead-free compliance reports.
LTC3624IDD-23.3#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):
- 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#PBF FAQ
1.How can I place an order for LTC3624IDD-23.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624IDD-23.3#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-23.3#PBF reliable?
The price and inventory of LTC3624IDD-23.3#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-23.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC3624IDD-23.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624IDD-23.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624IDD-23.3#PBF?
LTC3624IDD-23.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624IDD-23.3#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-23.3#PBF?
For technical support, including LTC3624IDD-23.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624IDD-23.3#PBF requirements.
6.How does Aetrix verify that LTC3624IDD-23.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3624IDD-23.3#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-23.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC3624IDD-23.3#PBF?
All LTC3624IDD-23.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624IDD-23.3#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-23.3#PBF part is unused and in its original packaging.
Return procedure for LTC3624IDD-23.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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