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Analog Devices Inc. LTC3624EMSE-2#PBF
- Part No.:
- LTC3624EMSE-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3624EMSE-2#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,211
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Product details
Overview
LTC3624EMSE-2#PBF from Analog Devices (formerly Linear Technology) is a 17V, 2A synchronous step-down regulator in a 12-lead MSOP package, featuring 2.25MHz fixed switching frequency, 3.5µA quiescent current in shutdown, and adjustable 0.6V–VIN output voltage. It delivers high efficiency across wide input (2.7V–17V) and load ranges, supporting battery-powered instrumentation and portable radios.
For engineers reviewing the LTC3624EMSE-2#PBF datasheet, LTC3624EMSE-2#PBF pinout, LTC3624EMSE-2#PBF application, or LTC3624EMSE-2#PBF equivalent, key selection criteria include ultralow IQ operation, 2.25MHz sync capability, ±1% VFB accuracy, dropout performance at 100% duty cycle, and thermal management via exposed pad grounding.
Technical Context
The LTC3624EMSE-2#PBF employs constant-frequency peak current mode control with internal compensation and 1ms soft-start. Its 2.25MHz oscillator supports ±40% external synchronization via the MODE/SYNC pin, enabling EMI reduction and multi-rail timing coordination.
It integrates PMOS/NMOS power switches with 200mΩ/115mΩ RDS(ON), operates down to 2.7V input, sustains 100% duty cycle for low-dropout regulation, and includes overtemperature protection, VIN overvoltage lockout (19V), and PGOOD with 32-cycle blanking delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and battery systems including 12V rails and Li-ion stacks. |
| Output Voltage Range | 0.6V to VIN - enables flexible point-of-load regulation from sub-1V logic supplies to near-input tracking. |
| Switching Frequency | 2.25MHz (±40% sync range) - allows compact magnetics and reduces EMI fundamental below sensitive bands. |
| Quiescent Current | 3.5µA in shutdown - extends battery life in always-on emergency radios and sensor nodes. |
| Output Accuracy | ±1% over temperature - ensures stable reference for precision analog circuitry without external trimming. |
| Peak Current Limit | 2.4A (E-grade) - provides robust short-circuit protection while maintaining 2A continuous output capability. |
| Thermal Shutdown | 150°C junction limit - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
Package: 12-Lead Plastic MSOP with exposed thermal pad (Pin 13 = GND). Requires soldering of exposed pad to PCB ground plane for rated θJA = 40°C/W and thermal reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 1,2) | Switch node | Connects to inductor; carries high di/dt square wave - requires tight layout and Kelvin connection for stability. |
| VIN (Pins 3,4) | Main input supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and high-side switch - needs local 10µF ceramic bypass. |
| RUN (Pin 5) | Enable control | Active-high logic input; pulls low to disable regulator and reduce IQ to 0.1µA - must not float. |
| PGOOD (Pin 6) | Power-good indicator | Open-drain output asserting high when VOUT is within ±7.5%; includes 32-cycle blanking to reject transients. |
| FB (Pin 8) | Feedback sense | Monitors resistor divider output; regulates to 0.6V reference - sets VOUT = 0.6V × (1 + R2/R1). |
| INTVCC (Pin 9) | Internal LDO output | 3.6V regulated supply for gate drivers and logic - requires ≥2.2µF ceramic capacitor to GND. |
| MODE/SYNC (Pin 10) | Operating mode select | Configures Burst Mode (to INTVCC), pulse-skipping (to GND), forced continuous (1V–VINTVCC–1.2V), or external clock sync. |
| GND (Pins 11,12,13) | Signal & power ground | Common return for all circuits; exposed pad (Pin 13) is mandatory GND connection for thermal and electrical performance. |
| NC (Pin 7) | No connect | Internally unconnected - no routing or termination required. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces IQ to 3.5µA at light loads by entering sleep cycles - critical for multi-year battery life in portable instrumentation. |
| 100% duty cycle low-dropout | Maintains regulation as VIN approaches VOUT - enables seamless operation during brownout or single-cell Li-ion discharge. |
| Internal soft-start (1ms) | Prevents inrush current and output overshoot during power-up - eliminates need for external timing components. |
| Synchronizable 2.25MHz oscillator | Enables deterministic EMI placement and avoids beat frequencies in multi-regulator systems - supports clock tree alignment. |
| Integrated overvoltage protection | Shuts down at VIN > 19V and auto-resumes at 18.5V - protects internal MOSFETs from transient spikes without external TVS. |
Applications
| Portable Instrumentation | Emergency Radios |
|---|---|
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 buck converter delivering regulated 3.3V from variable battery input with minimal load-dependent dropout. Use Value: 3.5µA shutdown IQ and 100% duty cycle operation extend battery runtime beyond 500 hours in sleep mode. | Use Scenario: Battery-backed emergency AM/FM radio with instant-on requirement and 12V nominal input from rechargeable pack. IC Role / Device Role / Timing Role: Main 5V supply for audio amplifier and tuner ICs, synchronized to system clock to suppress audible switching noise. Use Value: 2.25MHz switching enables use of 2.2µH inductor and small ceramic caps - reducing board area by 40% vs 1MHz designs. |
| Battery-Powered Equipment | General Purpose Step-Down Supplies |
Use Scenario: Wireless sensor node with intermittent BLE transmission, operating from CR2032 coin cell (2.0V–3.0V). IC Role / Device Role / Timing Role: Adjustable-output buck supplying 1.8V to microcontroller core, dynamically reconfigured via FB divider. Use Value: ±1% VFB accuracy ensures consistent core voltage across temperature - eliminating calibration drift in field deployments. | Use Scenario: Industrial control module requiring isolated 3.3V rail from unregulated 12V bus with high ripple rejection. IC Role / Device Role / Timing Role: Non-isolated point-of-load regulator with PGOOD monitoring for system health reporting. Use Value: PGOOD with 32-cycle blanking prevents false fault assertions during motor startup transients - improving system uptime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62840DRLR | 2.4V–6V input, 0.6V–5.5V output, 1.8µA IQ, 2.25MHz - narrower VIN range, lower max current (1A). | Optimized for ultra-low-power wearables; lacks VIN OVP and 100% duty cycle. | Select for sub-1A, single-cell Li-ion apps where IQ < 2µA is mandatory and input never exceeds 6V. |
| MP2143GJ-Z | 4.5V–17V input, 0.8V–15V output, 25µA IQ, 2.2MHz - higher IQ, no sync capability, no Burst Mode. | Cost-sensitive industrial supplies; requires external soft-start and lacks low-IQ sleep modes. | Select for fixed 12V-to-5V conversion where BOM cost outweighs battery life and EMI control requirements. |
Compared with TPS62840DRLR and MP2143GJ-Z, the LTC3624EMSE-2#PBF uniquely combines 2.25MHz sync, 3.5µA shutdown IQ, 100% duty cycle, and integrated VIN OVP - making it optimal for battery-critical, thermally constrained, and EMI-sensitive portable designs.
Availability
LTC3624EMSE-2#PBF is available at Aetrix Electronics and suitable for portable instrumentation, emergency radios, and battery-powered equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3624EMSE-2#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 high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3624 family targets ultra-low-power, high-density DC/DC conversion in space-constrained portable and battery-operated systems - emphasizing quiescent current optimization, thermal efficiency, and EMI control.
FAQ
What is the maximum input voltage rating for the LTC3624EMSE-2#PBF?
The LTC3624EMSE-2#PBF has an absolute maximum VIN rating of 17V. Operation above this voltage risks permanent damage. Its overvoltage lockout activates at 19V (rising) with 500mV hysteresis, suspending switching until VIN drops to 18.5V - protecting internal MOSFETs during transients. This behavior is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet.
How does the MODE/SYNC pin configure operating modes on the LTC3624EMSE-2#PBF?
The MODE/SYNC pin on the LTC3624EMSE-2#PBF selects between four functional states: tie to INTVCC for Burst Mode (3.5µA IQ), ground for pulse-skipping (low ripple), apply 1V–VINTVCC–1.2V for forced continuous mode, or drive with external clock for synchronization. Each configuration directly alters control loop behavior - confirmed by Pin Functions and Operation sections in the datasheet.
Does the LTC3624EMSE-2#PBF support adjustable output voltage, and how is it set?
Yes, the LTC3624EMSE-2#PBF supports adjustable output from 0.6V to VIN using a resistor divider from VOUT to FB. The equation is VOUT = 0.6V × (1 + R2/R1), where FB is regulated to 0.6V ±1%. Fixed-output variants exist (e.g., LTC3624EMSE-23.3#PBF), but the LTC3624EMSE-2#PBF itself is adjustable - verified in the Options table and Applications Information section.
What thermal considerations apply to the LTC3624EMSE-2#PBF in the MSOP package?
The LTC3624EMSE-2#PBF in the 12-lead MSOP package requires soldering of the exposed pad (Pin 13) to a PCB ground plane to achieve θJA = 40°C/W and prevent thermal shutdown. Without this, junction temperature rise exceeds limits under 2A load. The datasheet specifies TJMAX = 150°C and mandates exposed-pad grounding for both electrical integrity and thermal performance.
Is the LTC3624EMSE-2#PBF RoHS-compliant and lead-free?
Yes, the LTC3624EMSE-2#PBF carries the #PBF suffix indicating lead-free finish and full RoHS compliance per Analog Devices' specifications. The Order Information table explicitly lists "LEAD FREE FINISH" for this part number, and marking code "36242" corresponds to the lead-free MSOP variant - confirmed in the Linear Technology (now Analog Devices) packaging documentation.
LTC3624EMSE-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) 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:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3624EMSE-2#PBF FAQ
1.How can I place an order for LTC3624EMSE-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624EMSE-2#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 LTC3624EMSE-2#PBF reliable?
The price and inventory of LTC3624EMSE-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3624EMSE-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3624EMSE-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624EMSE-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624EMSE-2#PBF?
LTC3624EMSE-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624EMSE-2#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 LTC3624EMSE-2#PBF?
For technical support, including LTC3624EMSE-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624EMSE-2#PBF requirements.
6.How does Aetrix verify that LTC3624EMSE-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3624EMSE-2#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 LTC3624EMSE-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3624EMSE-2#PBF?
All LTC3624EMSE-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624EMSE-2#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 LTC3624EMSE-2#PBF part is unused and in its original packaging.
Return procedure for LTC3624EMSE-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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