My Inquiry
My Account
Analog Devices Inc. LTC3603IMSE#PBF
- Part No.:
- LTC3603IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3603IMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:259
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3603IMSE#PBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC converter delivering up to 2.5A output current, operating from 4.5V to 15V input, with adjustable 0.6V–14.5V output and internal 45mΩ/85mΩ MOSFETs. It supports programmable switching frequency (300kHz–3MHz), Burst Mode® for light-load efficiency, and features Power Good monitoring - used in point-of-load power supplies for FPGA core rails and telecom infrastructure.
For engineers reviewing the LTC3603IMSE#PBF datasheet, LTC3603IMSE#PBF pinout, LTC3603IMSE#PBF application, or LTC3603IMSE#PBF equivalent, key selection considerations include its –40°C to 125°C industrial temperature grade, 16-lead eMSOP thermal performance (θJA = 45°C/W), OPTI-LOOP® compensation for transient optimization, and dual-mode operation (Burst vs forced continuous) for noise-sensitive or efficiency-critical designs.
Technical Context
The LTC3603IMSE#PBF implements constant-frequency current-mode control with internal slope compensation recovery to stabilize operation above 30% duty cycle and maintain consistent peak inductor current across wide VIN/VOUT ranges. Its error amplifier uses a precise 0.6V ±1% reference and transconductance (gm = 1.7mS) to regulate feedback via the VFB pin.
It integrates dual N-channel MOSFETs (top RDS(ON) = 45mΩ, bottom = 85mΩ), a 5V INTVCC LDO, and configurable mode control via SYNC/MODE pin - supporting Burst Mode (0.42V–1V), forced continuous (tied to INTVCC), or external clock synchronization (300kHz–3MHz). Overvoltage, overtemperature, and short-circuit protections are embedded.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 15V DC - supports wide-input industrial and telecom power rails without pre-regulation. |
| Output Current | Up to 2.5A continuous - sufficient for powering mid-power FPGA cores or ASIC I/O banks. |
| Output Voltage Range | 0.6V to 14.5V adjustable - enables precise core voltage setting (e.g., 0.85V for modern processors) with ±1% reference accuracy. |
| Switching Frequency | 300kHz to 3MHz - selectable via RT resistor or external sync clock; higher frequencies allow smaller magnetics and tighter layout. |
| Quiescent Current | 75µA in Burst Mode sleep - extends battery life in portable instruments during standby. |
| Efficiency | Up to 99% peak - achieved via synchronous rectification eliminating Schottky losses and low RDS(ON) switches. |
| Duty Cycle Limit | 99% maximum - enables ultra-low dropout operation near VIN ≈ VOUT, critical for high-VIN-to-low-VOUT conversion. |
Pinout & Package
Package: 16-Lead Plastic eMSOP (exposed pad SGND, θJA = 45°C/W, TJMAX = 125°C). Exposed pad (Pin 17) must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INTVCC (Pin 1, 3) | Internal 5V LDO output | Supplies gate drive and internal logic; decoupling required for stable operation. |
| SYNC/MODE (Pin 2, 4) | Mode select & sync input | Configures Burst Mode (0.42–1V), forced continuous (tied to INTVCC), or external clock sync (300kHz–3MHz). |
| PGOOD (Pin 3, 5) | Open-drain power-good flag | Asserts high when VOUT is within ±10% of regulation - used for system sequencing and fault detection. |
| RT (Pin 4, 6) | Oscillator timing resistor node | Sets switching frequency via external resistor (ROSC = 1.15×10¹¹/f − 10kΩ); determines inductor size trade-off. |
| ITH (Pin 5, 7) | Error amplifier compensation node | Carries transconductance amplifier output; connects to RC network for loop stability tuning. |
| VFB (Pin 6, 8) | Feedback input | Monitors resistive divider output; regulates to 0.6V reference for precise output voltage setting. |
| SGND (Pin 7, Exposed Pad 17) | Signal ground reference | Low-impedance analog ground return; exposed pad must be soldered for thermal performance and noise immunity. |
| RUN (Pin 8, 10) | Enable control input | Active-high enable (threshold 0.4–1.1V); tie to PVIN for always-on operation; floating not allowed. |
| TRACK/SS (Pin 9, 11) | Voltage tracking & soft-start | Enables output voltage ramping or tracking of external supply; 1.2µA pull-up allows external capacitor programming. |
| PGND (Pins 10, 11) | Power ground return | High-current return path for SW node and internal MOSFETs; separate from SGND to minimize noise coupling. |
| SW (Pins 12, 13) | Switch node connection | Drives external inductor; experiences fast dV/dt transitions - requires tight layout and minimal trace length. |
| BOOST (Pin 14, 20) | Bootstrap supply for top gate | Charged via external capacitor between BOOST and SW; enables high-side N-MOSFET drive above PVIN. |
| PVIN (Pins 15, 16) | Main power input | Accepts 4.5–15V input; requires local ceramic decoupling to PGND to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows external RC network on ITH pin to optimize transient response across wide load and output capacitor variations - reduces output voltage deviation during load steps. |
| Adjustable Burst Mode Clamp | Voltage on SYNC/MODE pin sets minimum peak inductor current (IBURST = 6A/V × [VS/M − 0.42V]), enabling fine-tuned ripple-efficiency trade-off at light loads. |
| 99% Maximum Duty Cycle | Supports ultra-low dropout operation down to VIN − VOUT ≈ 100mV (limited by RDS(ON) drop), critical for high-input, low-output applications like 12V-to-1.2V conversion. |
| Integrated 5V INTVCC LDO | Provides regulated gate drive and bias for internal circuitry - eliminates need for external bias supply and simplifies BOM. |
| Overtemperature Protection | Shuts down both MOSFETs at ~150°C junction temperature and auto-restarts at ~115°C - prevents thermal runaway in enclosed or high-ambient environments. |
Applications
| Baseband Processor Power | FPGA Core Supply |
|---|---|
Use Scenario: Powering ARM-based baseband processors in 4G/LTE small cells requiring dynamic voltage scaling and low-noise operation. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.0V/1.2V core voltage with fast transient response to processor DVFS events. Use Value: OPTI-LOOP® compensation maintains <50mV output deviation during 1A load steps; Burst Mode reduces quiescent current to 75µA during idle states. | Use Scenario: Generating clean, tightly regulated 0.85V core rail for Xilinx Artix-7 FPGAs in industrial control modules. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with precise 0.6V reference enabling sub-1% output tolerance at 0.85V. Use Value: Internal 45mΩ/85mΩ MOSFETs achieve >92% efficiency at 2A load; 99% duty cycle supports reliable startup from 5V input. |
| Optical Transceiver Module | Portable Test Instrument |
Use Scenario: Providing isolated 3.3V/2.5A bias for SFP+ optical transceivers in datacom line cards with strict EMI limits. IC Role / Device Role / Timing Role: Synchronizable buck regulator locked to system clock to shift switching harmonics out of sensitive RF bands. Use Value: External clock sync (300kHz–3MHz) eliminates beat frequencies; forced continuous mode suppresses broadband noise below 100MHz. | Use Scenario: Battery-powered handheld oscilloscope requiring long runtime and stable analog supply rails. IC Role / Device Role / Timing Role: Main system power IC converting single-cell Li-ion (3.0–4.2V) to 3.3V logic rail with low quiescent current. Use Value: 75µA Burst Mode IQ extends battery life; TRACK/SS pin enables coordinated startup with analog front-end to prevent latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3603EMSE#PBF | Same silicon, rated for 0°C to 85°C junction temperature (vs –40°C to 125°C for LTC3603IMSE#PBF). | Not suitable for extended-temperature industrial or automotive under-hood use. | Select LTC3603IMSE#PBF for designs requiring guaranteed operation at –40°C ambient or high-power dissipation in compact enclosures. |
| MP2315DJ-LF-Z | 2.5A, 15V input, but fixed 3.3V output; no SYNC/MODE pin; lower max frequency (1.5MHz); no OPTI-LOOP® or TRACK/SS. | Lacks programmability and advanced features - limited to fixed-output, cost-sensitive applications. | Choose only if fixed 3.3V output suffices and thermal margin allows higher RDS(ON) (110mΩ top switch). |
Compared with LTC3603EMSE#PBF, the LTC3603IMSE#PBF guarantees full specification compliance over –40°C to 125°C, making it suitable for harsh environments; versus MP2315DJ-LF-Z, it offers full output adjustability, superior transient response via OPTI-LOOP®, and flexible mode control - critical for high-performance embedded systems.
Availability
LTC3603IMSE#PBF is available at Aetrix Electronics and suitable for point-of-load supplies, portable instrumentation, and communications infrastructure requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC3603IMSE#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 qualification and long-term product support.
The LTC3603IMSE#PBF belongs to Linear's monolithic synchronous buck regulator family, designed specifically for high-efficiency, low-noise, and thermally constrained point-of-load applications in industrial, telecom, and test equipment.
FAQ
What is the maximum junction temperature rating for the LTC3603IMSE#PBF?
The LTC3603IMSE#PBF has a maximum junction temperature (TJMAX) of 125°C. Its overtemperature protection activates at approximately 150°C to shut down both power switches, and automatic restart occurs once the junction cools below ~115°C. This thermal shutdown behavior is fully characterized for the –40°C to 125°C operating junction temperature range specified for the LTC3603IMSE#PBF.
How does the LTC3603IMSE#PBF achieve 99% duty cycle operation?
The LTC3603IMSE#PBF achieves up to 99% duty cycle by forcing the top MOSFET on continuously while periodically pulsing the bottom MOSFET (~85ns every 16 cycles) to refresh the BOOST capacitor. This maintains gate drive for the high-side switch even when VIN approaches VOUT, enabling ultra-low dropout operation - critical for applications like 5V-to-3.3V or 12V-to-1.2V conversion where input margin is minimal.
Can the LTC3603IMSE#PBF be synchronized to an external clock, and what is the supported frequency range?
Yes, the LTC3603IMSE#PBF can be synchronized to an external 5V clock applied to the SYNC/MODE pin. The supported synchronization frequency range is 300kHz to 3MHz. When synchronized, the device operates in pulse-skipping mode, and the internal RT resistor should be selected for a frequency ~25% lower than the sync clock to ensure stable locking.
What is the purpose of the TRACK/SS pin on the LTC3603IMSE#PBF, and how is it used?
The TRACK/SS pin on the LTC3603IMSE#PBF serves dual functions: voltage tracking and external soft-start. When a ramp voltage is applied, the output tracks that voltage until it exceeds 0.6V; beyond that, regulation defaults to the internal reference. For soft-start, a capacitor tied from TRACK/SS to ground creates a controlled output ramp via the internal 1.2µA current source - preventing inrush current and enabling safe sequencing with other rails in multi-supply systems.
Does the LTC3603IMSE#PBF require an external Schottky diode?
No, the LTC3603IMSE#PBF does not require an external Schottky diode. It integrates synchronous N-channel MOSFETs (top RDS(ON) = 45mΩ, bottom = 85mΩ) to replace the freewheeling diode, eliminating conduction losses and improving efficiency - especially at higher load currents. This integration reduces BOM count, board area, and thermal design complexity compared to asynchronous buck converters.
LTC3603IMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (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):
- 4.5V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 14.5V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3603IMSE#PBF FAQ
1.How can I place an order for LTC3603IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3603IMSE#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 LTC3603IMSE#PBF reliable?
The price and inventory of LTC3603IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3603IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3603IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3603IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3603IMSE#PBF?
LTC3603IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3603IMSE#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 LTC3603IMSE#PBF?
For technical support, including LTC3603IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3603IMSE#PBF requirements.
6.How does Aetrix verify that LTC3603IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3603IMSE#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 LTC3603IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3603IMSE#PBF?
All LTC3603IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3603IMSE#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 LTC3603IMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3603IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3603IMSE#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…
