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Analog Devices Inc. LTC3624IDD-5#PBF
- Part No.:
- LTC3624IDD-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3624IDD-5#PBF.pdf
- Description:
- IC REG BUCK 5V 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:144
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Product details
Overview
LTC3624IDD-5#PBF from Analog Devices (formerly Linear Technology) is a 2.25MHz, 5V fixed-output synchronous step-down regulator delivering up to 2A output current from 2.7V–17V input. It features 3.5µA quiescent current in Burst Mode, ±1% output voltage accuracy, and operates in forced continuous, pulse-skipping, or Burst Mode via MODE/SYNC pin control - ideal for battery-powered instrumentation requiring long runtime and stable 5V rail generation.
For engineers reviewing the LTC3624IDD-5#PBF datasheet, LTC3624IDD-5#PBF pinout, LTC3624IDD-5#PBF application, or LTC3624IDD-5#PBF equivalent, key selection criteria include its 2.25MHz switching frequency enabling compact magnetics, ultralow IQ for standby efficiency, integrated soft-start and overtemperature protection, and compatibility with ceramic input/output capacitors in space-constrained portable designs.
Technical Context
The LTC3624IDD-5#PBF implements a constant-frequency peak current mode control architecture with internal compensation. Its 2.25MHz oscillator supports ±40% external synchronization via the MODE/SYNC pin, and it maintains regulation down to 100% duty cycle during dropout operation.
It integrates dual MOSFET power switches (PMOS high-side, NMOS low-side), a 0.6V reference error amplifier, programmable operating modes, and a dedicated PGOOD indicator with 32-cycle blanking delay. The device uses internal slope compensation to ensure stability across wide VIN/VOUT ratios without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% - eliminates external feedback divider; ensures precise logic supply for microcontrollers and sensors. |
| Switching Frequency | 2.25MHz (±40% sync range) - enables use of sub-3.3µH inductors and <10µF ceramic output caps for ultra-compact layouts. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on monitoring devices by minimizing no-load power draw. |
| Max Output Current | 2A continuous - supports moderate-power peripherals like displays, ADCs, or RF modules without external boost stages. |
| Input Voltage Range | 2.7V to 17V - accommodates single-cell Li-ion (2.7–4.2V), 5V USB, 12V industrial rails, and automotive transients. |
| Efficiency Peak | 95% at 5V/1A - reduces thermal load in sealed enclosures and lowers system-level cooling requirements. |
| Thermal Shutdown | Active at TJ ≥ 150°C - protects against sustained overload or poor PCB heatsinking in embedded deployments. |
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 current - must be routed with minimal loop area to reduce EMI. |
| VIN (Pin 2) | Main input supply | Accepts 2.7–17V; powers internal LDO (INTVCC) and high-side switch - requires local 10µF ceramic bypass. |
| RUN (Pin 3) | Enable control | Logic-high (>1.0V) enables regulation; tied low disables output and reduces IQ to 0.1µA - used for system power sequencing. |
| PGOOD (Pin 4) | Power-good indicator | Open-drain output pulled low if VOUT deviates >±7.5% - provides 32-cycle blanking to reject transient glitches. |
| FB (Pin 5) | Feedback input | Internally connected to 5V output - no external resistor divider needed; simplifies layout and improves accuracy. |
| 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 | Tie to INTVCC for Burst Mode (low IQ), GND for pulse-skipping (low ripple), or external clock for sync - configures core behavior. |
| GND (Pins 8 & 9) | Signal and power ground | Exposes thermal pad (Pin 9) - mandatory connection to PCB ground plane for thermal performance and noise immunity. |
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 5V output | Eliminates external resistors and layout sensitivity - guarantees ±1% accuracy across temperature and line/load. |
| 2.25MHz switching | Permits use of 2.2µH inductors and 4.7–10µF X5R/X7R ceramics - reduces solution size by >40% vs 1MHz alternatives. |
| 100% duty cycle operation | Maintains regulation down to VIN = VOUT - critical for Li-ion end-of-discharge support in portable medical devices. |
| Integrated soft-start | 1ms internal ramp prevents inrush current - avoids brownout on shared 5V rails during cold start. |
| Overtemperature protection | Shuts down at 150°C junction - safeguards against thermal runaway in enclosed industrial housings. |
Applications
| Battery-Powered Instrumentation | Emergency Radios |
|---|---|
Use Scenario: Handheld multimeters and portable gas analyzers powered by two AA alkaline cells (2.4–3.2V) requiring clean, regulated 5V for MCU and analog front-end. IC Role / Device Role / Timing Role: Primary DC/DC converter generating stable 5V rail; manages transition from fresh to depleted batteries via 100% duty cycle dropout. Use Value: 3.5µA IQ extends battery life to >500 hours; 2.25MHz operation minimizes inductor size for pocket-sized form factor. | Use Scenario: Solar-charged emergency radios with LiFePO₄ backup (2.8–3.6V) needing reliable 5V supply during grid outage. IC Role / Device Role / Timing Role: Main step-down regulator supporting burst transmission; enters Burst Mode between transmissions to conserve energy. Use Value: Maintains regulation at 2.8V input (dropout); PGOOD signals MCU when 5V rail is stable for RF startup sequence. |
| Portable Medical Sensors | Industrial Control Modules |
Use Scenario: Wearable ECG monitors using coin-cell battery (2.0–3.0V) and requiring low-noise 5V for signal chain and BLE radio. IC Role / Device Role / Timing Role: Fixed-output buck supplying analog and digital domains; configured in pulse-skipping mode to limit output ripple. Use Value: ±1% VOUT accuracy ensures consistent ADC reference; ceramic-capacitor compatibility eliminates ESR-related noise sources. | Use Scenario: DIN-rail mounted PLC I/O modules powered from 12–24V DC bus, needing isolated 5V for microcontroller and interface ICs. IC Role / Device Role / Timing Role: Primary non-isolated 5V supply; synchronized to system clock via MODE/SYNC to reduce conducted EMI in noisy factory environments. Use Value: 2.25MHz sync capability aligns switching edges with master clock - simplifies EMI filtering and meets CISPR-22 Class B limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62865ARGTR | 2.5V–5.5V input; 5V fixed output; 2.25MHz; 2A; 1.2µA IQ - lower IQ but narrower VIN range. | Not suitable for 12V or automotive input; limited to USB-powered or single-cell Li-ion systems. | Select when ultra-low IQ dominates and input never exceeds 5.5V. |
| MP2451DT-LF-Z | 4.5V–36V input; 5V fixed; 2MHz; 0.6A; 260µA IQ - higher IQ, lower current, wider VIN. | Supports 24V industrial rails but cannot drive 2A loads; unsuitable for high-current sensor nodes. | Select when input voltage exceeds 17V and load current ≤600mA. |
Compared with TPS62865ARGTR and MP2451DT-LF-Z, the LTC3624IDD-5#PBF uniquely balances 2A capability, 2.25MHz switching, 3.5µA IQ, and 17V max input - making it optimal for portable equipment bridging USB, Li-ion, and 12V adapter operation without compromising runtime or size.
Availability
LTC3624IDD-5#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, emergency communication devices, portable medical sensors, and industrial control modules requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3624IDD-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 full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3624 series was designed specifically for high-efficiency, low-quiescent-current DC/DC conversion in space- and power-constrained portable electronics - emphasizing small solution size, wide input range, and robust light-load efficiency.
FAQ
What is the switching frequency of the LTC3624IDD-5#PBF?
The LTC3624IDD-5#PBF operates at a fixed 2.25MHz switching frequency, with ±40% synchronization range via the MODE/SYNC pin. This allows precise EMI control and enables compact external components - including 2.2µH inductors and 4.7–10µF ceramic capacitors - while maintaining high efficiency across load conditions.
Does the LTC3624IDD-5#PBF require external feedback resistors?
No, the LTC3624IDD-5#PBF does not require external feedback resistors. As a fixed 5V output variant, the FB pin is internally connected to the output, eliminating external divider components and ensuring ±1% output accuracy without layout-induced errors or temperature drift from resistor networks.
How does the LTC3624IDD-5#PBF achieve ultralow quiescent current?
The LTC3624IDD-5#PBF achieves 3.5µA quiescent current in Burst Mode by entering sleep cycles where both power switches are off and only essential bias circuitry remains active. During sleep, the output capacitor sustains the load until VOUT droops enough to trigger a new switching burst - optimizing efficiency at light loads typical in battery-powered standby states.
Can the LTC3624IDD-5#PBF operate with input voltage equal to output voltage?
Yes, the LTC3624IDD-5#PBF supports 100% duty cycle operation, allowing regulation down to VIN = VOUT = 5V. In dropout, the high-side PMOS switch remains continuously on while control circuitry maintains feedback accuracy - critical for sustaining operation as Li-ion batteries discharge below 5V.
What thermal considerations apply to the LTC3624IDD-5#PBF in a 3mm × 3mm DFN package?
The LTC3624IDD-5#PBF uses an 8-lead DFN with exposed thermal pad (Pin 9 = GND). For rated θJA = 43°C/W, the exposed pad must be soldered to a minimum 100mm² PCB copper pour connected to ground. Without proper thermal land design, junction temperature may exceed 150°C under 2A load at elevated ambient, triggering thermal shutdown.
LTC3624IDD-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)
LTC3624IDD-5#PBF FAQ
1.How can I place an order for LTC3624IDD-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624IDD-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 LTC3624IDD-5#PBF reliable?
The price and inventory of LTC3624IDD-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 LTC3624IDD-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC3624IDD-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624IDD-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624IDD-5#PBF?
LTC3624IDD-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624IDD-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 LTC3624IDD-5#PBF?
For technical support, including LTC3624IDD-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624IDD-5#PBF requirements.
6.How does Aetrix verify that LTC3624IDD-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3624IDD-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 LTC3624IDD-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC3624IDD-5#PBF?
All LTC3624IDD-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624IDD-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 LTC3624IDD-5#PBF part is unused and in its original packaging.
Return procedure for LTC3624IDD-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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