My Inquiry
My Account
Analog Devices Inc. LTC3624EDD-3.3#PBF
- Part No.:
- LTC3624EDD-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3624EDD-3.3#PBF.pdf
- Description:
- IC REG BUCK 3.3V 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,785
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3624EDD-3.3#PBF from Analog Devices (formerly Linear Technology) is a 17V, 2A synchronous step-down regulator in an 8-lead 3mm × 3mm DFN package, delivering fixed 3.3V output with ±1% accuracy, 1MHz switching frequency, and 3.5µA quiescent current - optimized for battery-powered instrumentation and emergency radios requiring ultra-low standby power.
For engineers reviewing the LTC3624EDD-3.3#PBF datasheet, LTC3624EDD-3.3#PBF pinout, LTC3624EDD-3.3#PBF application, or LTC3624EDD-3.3#PBF equivalent, key selection criteria include its fixed 3.3V output, 1MHz constant-frequency operation, Burst Mode® capability for sub-µA light-load IQ, integrated soft-start, and internal compensation eliminating external loop components.
Technical Context
The LTC3624EDD-3.3#PBF implements a peak-current-mode, constant-frequency buck architecture with internal PMOS/NMOS power switches, 0.6V reference, and programmable operating mode via MODE/SYNC pin. It supports forced continuous, pulse-skipping, and Burst Mode® operation - the latter enabling 3.5µA quiescent current at no load while maintaining regulation.
It features internal soft-start (1ms), overtemperature protection, VIN overvoltage lockout (19V), and PGOOD with ±7.5% window and 32-cycle blanking delay. The FB pin is internally connected to VOUT for fixed-output variants, eliminating external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% - eliminates feedback resistor network, reduces BOM count and layout sensitivity. |
| Input Voltage Range | 2.7V to 17V - supports single-cell Li-ion, multi-cell alkaline, and industrial 12V rails without external pre-regulation. |
| Max Output Current | 2A continuous - sustains full load across full temperature range with thermal derating per θJA = 43°C/W. |
| Quiescent Current | 3.5µA in Burst Mode® - enables >1-year battery life in always-on portable instrumentation with intermittent wake-up. |
| Switching Frequency | 1MHz (±8%) - enables compact 2.2µH inductors and low-profile ceramic input/output capacitors. |
| Efficiency Peak | 95% at 1A/5V out - achieved via low RDS(ON) (115mΩ NMOS, 200mΩ PMOS) and synchronous rectification. |
| PGOOD Accuracy | ±7.5% window - provides reliable system-level power sequencing and fault detection without external comparators. |
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 | Connects to inductor; carries high di/dt square wave - requires tight layout and Kelvin return path to minimize EMI. |
| VIN (Pins 2, 3) | Main input supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and gate drivers - bypass with ≥10µF ceramic close to pins. |
| RUN (Pin 4) | Enable control | Active-high logic input; pulls down to GND disables regulator and reduces IQ to 0.1µA shutdown state. |
| PGOOD (Pin 5) | Power-good indicator | Open-drain output pulled low if VOUT deviates >±7.5% - used for system reset or sequencing with external pull-up. |
| FB (Pin 6) | Feedback sense | Internally tied to VOUT for fixed 3.3V version - no external divider required; simplifies design and improves accuracy. |
| INTVCC (Pin 7) | Internal LDO output | 3.6V regulated supply for gate drivers and logic - bypass with ≥2.2µF ceramic to GND for stability. |
| MODE/SYNC (Pin 8) | Operating mode control | Tie to INTVCC for Burst Mode®, GND for pulse-skipping, or external clock (1MHz ±40%) for synchronization. |
| GND (Pins 9, 10) | Power & signal ground | Exposes thermal pad (Pin 9); must be soldered to large PCB copper area for θJC = 5.5°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces IQ to 3.5µA at light loads while maintaining regulation - extends battery life in intermittent-use devices. |
| Integrated soft-start | 1ms internal ramp prevents inrush current and output overshoot during startup - eliminates need for external timing capacitor. |
| Internal compensation | Eliminates external compensation network - reduces component count, layout complexity, and tuning effort for stable operation. |
| Low dropout capability | 100% duty cycle operation allows VOUT regulation down to VIN – 0.3V - supports high-efficiency operation near battery end-of-life. |
| Overvoltage lockout | Shuts down at VIN >19V and resumes at 18.5V - protects internal MOSFETs from transient spikes on 12V industrial rails. |
Applications
| Battery-Powered Instrumentation | Emergency Radios |
|---|---|
Use Scenario: Portable multimeter or data logger operating from two AA cells with sleep/wake cycles. IC Role / Device Role / Timing Role: Primary 3.3V system supply regulating down from 3.0V–3.6V battery stack. Use Value: 3.5µA quiescent current extends shelf life beyond 2 years; fixed 3.3V output ensures consistent ADC reference and MCU core voltage. | Use Scenario: Hand-crank or solar-charged AM/FM/NOAA emergency radio with long standby duration. IC Role / Device Role / Timing Role: Main 3.3V rail for RF front-end, microcontroller, and audio amplifier. Use Value: 1MHz switching enables small 2.2µH inductor and 10µF/47µF ceramic caps - critical for compact, shock-resistant enclosure design. |
| Portable Medical Sensors | Industrial IoT Edge Nodes |
Use Scenario: Wireless pulse oximeter using coin cell with BLE transmission bursts. IC Role / Device Role / Timing Role: Stable 3.3V supply for analog front-end and BLE SoC during 10ms active windows. Use Value: Burst Mode® maintains regulation during 100µA average load while minimizing noise coupling into sensitive analog circuits. | Use Scenario: DIN-rail mounted sensor node powered by 24V DC with isolated 3.3V logic supply. IC Role / Device Role / Timing Role: Secondary non-isolated 3.3V rail derived from local 12V intermediate bus. Use Value: 17V max input and 95% efficiency at 1A reduce thermal stress in confined enclosures; PGOOD enables watchdog reset on brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62840DRVR | 2.5V–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 intermediate rails; not for 12V or wide-VIN systems. | Select when ultra-low IQ and small solution size outweigh wide-input flexibility. |
| MP2451DT-LF-Z | 4.5V–36V input, 3.3V fixed, 260µA IQ, 2MHz - higher IQ, wider VIN, no Burst Mode®. | Acceptable for 12V/24V industrial supplies where standby current is secondary to cost and ruggedness. | Select when input exceeds 17V or extended temperature range (–40°C to +125°C) is required with lower cost target. |
Compared with TPS62840DRVR and MP2451DT-LF-Z, the LTC3624EDD-3.3#PBF uniquely balances 2.7V–17V input coverage, 3.5µA Burst Mode® IQ, and 1MHz fixed-frequency operation - making it optimal for dual-role portable equipment that must operate from both primary batteries and wall adapters.
Availability
LTC3624EDD-3.3#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, emergency radios, and portable medical sensors requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3624EDD-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 its precision power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3624EDD-3.3#PBF belongs to the LTC® monolithic synchronous buck regulator family, designed specifically for ultra-low-power, wide-input portable and industrial applications where quiescent current, small solution size, and robust protection features are critical.
FAQ
What is the output voltage tolerance of the LTC3624EDD-3.3#PBF?
The LTC3624EDD-3.3#PBF delivers a fixed 3.3V output with ±1% accuracy over temperature and line/load conditions, as specified in the Electrical Characteristics table (VOUT = 3.267V to 3.333V at TJ = –40°C to 125°C). This tight tolerance eliminates the need for post-production calibration in precision 3.3V system rails.
Does the LTC3624EDD-3.3#PBF require external feedback resistors?
No. The LTC3624EDD-3.3#PBF is a fixed-output variant: the FB pin is internally connected to VOUT, so no external resistor divider is needed. This simplifies layout, improves accuracy by removing resistor tolerance and thermal drift effects, and reduces BOM cost versus adjustable versions like LTC3624EDD#PBF.
How does the MODE/SYNC pin function on the LTC3624EDD-3.3#PBF?
On the LTC3624EDD-3.3#PBF, the MODE/SYNC pin selects operating mode: tie to INTVCC for Burst Mode® (3.5µA IQ), ground for pulse-skipping (low ripple), or apply 1V–2.4V for forced continuous mode. It also accepts external clocks from 0.6MHz to 1.4MHz to synchronize switching and reduce EMI in dense PCB layouts.
What thermal considerations apply to the LTC3624EDD-3.3#PBF in DFN package?
The LTC3624EDD-3.3#PBF uses an 8-lead 3mm × 3mm DFN with exposed thermal pad (Pin 9). For rated thermal performance (θJC = 5.5°C/W), the pad must be soldered to a minimum 100mm² PCB copper area connected to internal ground planes. Without proper pad soldering, junction temperature rise may exceed 125°C at 2A load, triggering thermal shutdown.
Is the LTC3624EDD-3.3#PBF RoHS-compliant and lead-free?
Yes. The LTC3624EDD-3.3#PBF carries the #PBF suffix indicating lead-free finish and full RoHS compliance per EU Directive 2011/65/EU. Its marking "LGRG" and packaging in tape-and-reel format meet JEDEC J-STD-020 moisture sensitivity level 3 requirements for surface-mount assembly.
LTC3624EDD-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:
- 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-3.3#PBF FAQ
1.How can I place an order for LTC3624EDD-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624EDD-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 LTC3624EDD-3.3#PBF reliable?
The price and inventory of LTC3624EDD-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 LTC3624EDD-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC3624EDD-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624EDD-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624EDD-3.3#PBF?
LTC3624EDD-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624EDD-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 LTC3624EDD-3.3#PBF?
For technical support, including LTC3624EDD-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624EDD-3.3#PBF requirements.
6.How does Aetrix verify that LTC3624EDD-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3624EDD-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 LTC3624EDD-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC3624EDD-3.3#PBF?
All LTC3624EDD-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624EDD-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 LTC3624EDD-3.3#PBF part is unused and in its original packaging.
Return procedure for LTC3624EDD-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3624EDD-3.3#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
