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Analog Devices Inc. LTC3624IDD-3.3#PBF
- Part No.:
- LTC3624IDD-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3624IDD-3.3#PBF.pdf
- Description:
- IC REG BUCK 3.3V 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:681
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Product details
Overview
LTC3624IDD-3.3#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, delivering fixed 3.3V output with ±1% accuracy, 1MHz switching frequency, and ultralow 3.5µA quiescent current in Burst Mode - ideal for battery-powered instrumentation and emergency radios requiring long standby life.
For engineers reviewing the LTC3624IDD-3.3#PBF datasheet, LTC3624IDD-3.3#PBF pinout, LTC3624IDD-3.3#PBF application, or LTC3624IDD-3.3#PBF equivalent, key selection criteria include its fixed 3.3V output, 1MHz constant-frequency operation, 2.7V–17V input range, integrated power MOSFETs, and MODE/SYNC pin configurability for Burst Mode, pulse-skipping, or forced continuous operation.
Technical Context
The LTC3624IDD-3.3#PBF implements a peak-current-mode, constant-frequency buck architecture with internal compensation and soft-start. It integrates both PMOS high-side and NMOS low-side power switches, enabling full 100% duty-cycle dropout operation while maintaining ultralow IQ.
Its MODE/SYNC pin supports three operating modes: Burst Mode (for max light-load efficiency), pulse-skipping (for lowest output ripple), and forced continuous mode (for EMI-sensitive applications); it also accepts external clock synchronization within ±40% of 1MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% - eliminates external feedback divider, reduces BOM count and layout area. |
| Input Voltage Range | 2.7V to 17V - supports single-cell Li-ion, multi-cell alkaline, and industrial 12V rails without pre-regulation. |
| Max Output Current | 2A continuous - sustains full load across full temperature and input range with thermal derating per θJA = 43°C/W. |
| Quiescent Current | 3.5µA in Burst Mode - enables >1-year battery life in 10µA average-load portable devices. |
| Switching Frequency | 1MHz (±20%) - allows compact 2.2µH inductors and ceramic capacitors while avoiding AM radio band. |
| Feedback Reference | 0.6V internal - sets regulation point; FB pin tied directly to VOUT in fixed-output variants like LTC3624IDD-3.3#PBF. |
| PGOOD Accuracy | ±7.5% window - asserts high when VOUT is within 3.05V–3.55V, with 32-cycle blanking to suppress transient glitches. |
Pinout & Package
Package: 8-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 9), rated for –40°C to 125°C junction temperature. Exposed pad must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection to inductor; carries high di/dt square wave - requires tight loop layout and Kelvin connection to minimize 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 | Active-high logic input; <0.35V disables regulator, >1.0V enables - must not float; internal pull-down ensures safe default-off. |
| PGOOD (Pin 4) | Power-good indicator | Open-drain output with 280Ω pulldown; asserts high only when VOUT is within ±7.5% of 3.3V for ≥32 cycles. |
| FB (Pin 5) | Feedback input | Internally connected to VOUT in fixed-3.3V variant - no external resistor divider required. |
| INTVCC (Pin 6) | Bias LDO output | 3.6V regulated supply for gate drivers and logic; requires ≥2.2µF ceramic capacitor to GND for stability. |
| MODE/SYNC (Pin 7) | Operating mode select | Tied to INTVCC → Burst Mode; grounded → pulse-skipping; 1V–2.4V → forced continuous; driven by external clock → sync mode. |
| GND (Pins 8 & 9) | Signal and power ground | Pins 8 (top-side) and 9 (exposed pad) are internally connected - pad must be soldered to large PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ (3.5µA) | Enables multi-year battery life in always-on sensor nodes and emergency radios without compromising startup time. |
| 100% Duty-Cycle Operation | Maintains regulation down to VIN = VOUT + ~0.1V, supporting wide-input applications like automotive cold-crank (5.5V min). |
| Integrated Power FETs | Eliminates external MOSFETs and drivers - reduces solution size to <40 mm² and simplifies layout for noise-sensitive analog systems. |
| Internal Soft-Start (1ms) | Prevents inrush current and output overshoot during power-up - no external timing capacitor required. |
| Overtemperature Protection | Thermal shutdown at TJ ≈ 150°C with automatic recovery - protects against sustained overload or poor heatsinking. |
Applications
| Portable Instrumentation | Battery-Powered Equipment |
|---|---|
Use Scenario: Handheld multimeters and data loggers powered by two AA cells (2.4V–3.2V) requiring stable 3.3V for MCU and ADC. IC Role / Device Role / Timing Role: Primary 3.3V system rail regulator with zero external components beyond inductor and capacitors. Use Value: 3.5µA IQ extends battery life >2× versus comparable 10µA regulators; 100% duty cycle maintains regulation even as batteries discharge below 3.3V. | Use Scenario: Wireless sensor nodes using Li-SOCl₂ primary cells (3.6V nominal, up to 3.9V) needing efficient 3.3V conversion with minimal self-discharge. IC Role / Device Role / Timing Role: Standby-power-optimized buck converter enabling 10-year shelf life and ultra-low sleep current. Use Value: Burst Mode IQ of 3.5µA minimizes battery drain during 99.9% sleep time; PGOOD enables precise wake-up sequencing. |
| Emergency Radios | General Purpose Step-Down Supplies |
Use Scenario: NOAA weather radios powered by 6xAA (9V) or USB (5V), requiring robust 3.3V for RF front-end and microcontroller under variable input conditions. IC Role / Device Role / Timing Role: Main power regulator with overvoltage lockout (19V) and undervoltage lockout (2.7V) for input fault protection. Use Value: 17V absolute max rating and VIN OVP prevent damage from accidental 12V adapter misconnection; ±1% VOUT accuracy ensures reliable RF IC biasing. | Use Scenario: Industrial control modules accepting 12V or 24V DC inputs, stepping down to 3.3V for digital logic and communication interfaces (UART, I²C). IC Role / Device Role / Timing Role: Compact, thermally efficient point-of-load regulator with minimal external parts. Use Value: 2A capability supports mixed-signal loads; 1MHz switching enables small 2.2µH inductors and avoids audible noise in fanless enclosures. |
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 | 2.7V–6V input, 3.3V fixed, 1.8µA IQ, 2.25MHz - narrower VIN range, lower IQ, higher fSW. | Suitable only for single-cell Li-ion or 3.3V–5V inputs; not viable for 12V or 17V rails. | Select if input is strictly ≤6V and sub-2µA IQ is mandatory; avoid for wide-VIN legacy designs. |
| MP2451DT-LF-Z | 4.5V–36V input, 3.3V adjustable via resistors, 1.2mA IQ, 2MHz - wider VIN, higher IQ, requires external FB divider. | Supports 24V industrial inputs but lacks ultralow-IQ modes; less suitable for battery longevity. | Choose for cost-sensitive 12V/24V systems where 3.5µA IQ is unnecessary and layout space allows FB resistors. |
Compared with TPS62840DLCR and MP2451DT-LF-Z, the LTC3624IDD-3.3#PBF uniquely balances 2.7V–17V input flexibility, 3.5µA Burst Mode IQ, and fixed 3.3V output in a thermally optimized DFN - making it optimal for portable equipment bridging battery and wall-adapter operation.
Availability
LTC3624IDD-3.3#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, emergency radios, and portable medical devices requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3624IDD-3.3#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, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3624 series was designed specifically for high-efficiency, ultralow-quiescent-current DC/DC conversion in space-constrained, battery-dependent applications - emphasizing thermal performance, light-load efficiency, and ease of use.
FAQ
What is the guaranteed operating temperature range for the LTC3624IDD-3.3#PBF?
The LTC3624IDD-3.3#PBF is specified for operation from –40°C to 125°C junction temperature. Its "I-grade" designation confirms production testing across this full range, with thermal performance validated using θJA = 43°C/W and θJC = 5.5°C/W metrics. The exposed pad must be soldered to PCB ground to achieve rated thermal resistance.
Does the LTC3624IDD-3.3#PBF require external feedback resistors?
No. The LTC3624IDD-3.3#PBF is a fixed-output variant: its FB pin is internally connected to VOUT, eliminating the need for external resistors. This reduces component count, saves board space, and improves accuracy by removing resistor tolerance and layout parasitic effects - unlike adjustable versions such as LTC3624IDD#PBF.
How does the MODE/SYNC pin configure operating modes on the LTC3624IDD-3.3#PBF?
The MODE/SYNC pin on the LTC3624IDD-3.3#PBF selects among three modes: tie to INTVCC for Burst Mode (3.5µA IQ), ground for pulse-skipping (lowest ripple), or apply 1V–2.4V for forced continuous mode (EMI control). It also accepts external clocks from 0.6MHz to 1.4MHz for synchronization - all without changing external components.
What protection features are integrated into the LTC3624IDD-3.3#PBF?
The LTC3624IDD-3.3#PBF integrates input overvoltage lockout (19V trip, 18.5V release), input undervoltage lockout (2.7V), overtemperature shutdown (~150°C), and PGOOD monitoring with 32-cycle blanking. It also features reverse-current protection and internal current limiting (2.4A typical, 3A max), ensuring robust operation in demanding environments without external circuitry.
Can the LTC3624IDD-3.3#PBF operate in 100% duty cycle dropout mode?
Yes. The LTC3624IDD-3.3#PBF supports true 100% duty cycle operation, maintaining regulation when VIN approaches VOUT (e.g., 3.4V input for 3.3V output). In dropout, the high-side PMOS remains continuously on, and the controller sustains ultralow IQ - critical for extending runtime in deeply discharged battery applications.
LTC3624IDD-3.3#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:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC3624IDD-3.3#PBF FAQ
1.How can I place an order for LTC3624IDD-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624IDD-3.3#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-3.3#PBF reliable?
The price and inventory of LTC3624IDD-3.3#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-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC3624IDD-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624IDD-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624IDD-3.3#PBF?
LTC3624IDD-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624IDD-3.3#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-3.3#PBF?
For technical support, including LTC3624IDD-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624IDD-3.3#PBF requirements.
6.How does Aetrix verify that LTC3624IDD-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3624IDD-3.3#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-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC3624IDD-3.3#PBF?
All LTC3624IDD-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624IDD-3.3#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-3.3#PBF part is unused and in its original packaging.
Return procedure for LTC3624IDD-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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