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Analog Devices Inc. LTC3603EMSE#PBF
- Part No.:
- LTC3603EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3603EMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:10,407
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Product details
Overview
LTC3603EMSE#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 - used in point-of-load power supplies for FPGA core voltage regulation.
For engineers reviewing the LTC3603EMSE#PBF datasheet, LTC3603EMSE#PBF pinout, LTC3603EMSE#PBF application, or LTC3603EMSE#PBF equivalent, key selection considerations include its 1MHz typical switching frequency, OPTI-LOOP® compensation, Burst Mode® operation with adjustable clamp, PGOOD monitoring, and thermal performance in the 16-lead eMSOP package.
Technical Context
The LTC3603EMSE#PBF implements constant-frequency current-mode control with internal slope compensation recovery to stabilize operation above 50% duty cycle. Its dual N-channel synchronous power switches enable high efficiency without external diodes, while the ITH pin serves as both error amplifier output and burst comparator input for dynamic mode control.
It supports three operational modes via SYNC/MODE pin voltage: forced continuous (SYNC/MODE = INTVCC), Burst Mode® (0.42V–1V), or pulse-skipping (SYNC/MODE = GND). The integrated 5V INTVCC LDO powers internal circuitry and enables bootstrap capacitor charging via BOOST/SW nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 15V - supports wide industrial and telecom input rails including 5V, 12V, and 15V systems. |
| Output Current | Up to 2.5A - sufficient for powering mid-range FPGAs, DSPs, and ASIC cores. |
| Switch RDS(ON) | Top: 45mΩ, Bottom: 85mΩ - minimizes conduction loss and eliminates need for external Schottky diode. |
| Switching Frequency | 300kHz to 3MHz - programmable via RT resistor; 1MHz typical enables compact 2.2µH inductor and low-profile ceramic capacitors. |
| Feedback Reference | 0.6V ±1% - enables precise low-voltage outputs (e.g., 0.9V, 1.2V) critical for modern digital ICs. |
| Quiescent Current | 75µA in Burst Mode - extends battery life in portable instruments and always-on subsystems. |
| Power Good Output | Open-drain PGOOD with ±10% window - provides reliable system-level power sequencing and fault detection. |
Pinout & Package
Package: 16-lead thermally enhanced plastic eMSOP (exposed pad = SGND, must be soldered to PCB for θJA = 45°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INTVCC (Pins 1, 3) | 5V LDO output | Powers internal logic and gate drivers; supplies BOOST capacitor when SW toggles. |
| SYNC/MODE (Pin 2) | Mode select & sync input | Determines operation mode: forced continuous, Burst Mode®, or pulse-skipping; accepts external 300kHz–3MHz clock. |
| PGOOD (Pin 3) | Power good monitor | Open-drain flag pulled low if VOUT deviates >±10% - used for processor reset or system enable sequencing. |
| RT (Pin 4) | Oscillator timing input | Resistor-to-ground sets switching frequency; 105kΩ yields ~1MHz per datasheet Figure TA01. |
| ITH (Pin 5) | Error amplifier output / burst comparator input | Controls peak inductor current; voltage <330mV triggers sleep mode in Burst Mode®. |
| VFB (Pin 6) | Feedback input | Compares resistive divider output against 0.6V reference to regulate VOUT. |
| SGND (Pins 7, 17) | Signal ground | Reference for feedback, error amp, and logic; exposed pad (Pin 17) must be connected to PCB ground plane. |
| RUN (Pin 8) | Enable control | Active-high; ≥0.7V enables regulator - tied to PVIN for always-on operation. |
| TRACK/SS (Pin 9) | Voltage tracking / soft-start | Enables output voltage ramping to match another supply or external soft-start capacitor (1.2µA pull-up). |
| PGND (Pins 10, 11) | Power ground | Return path for high-current switch node; separate from SGND to minimize noise coupling. |
| SW (Pins 12, 13) | Switch node | Connects to inductor; experiences full PVIN-to-GND voltage swing at switching frequency. |
| BOOST (Pin 14) | Bootstrap supply | Charged by internal charge pump during SW low phase to drive top N-MOSFET gate above PVIN. |
| PVIN (Pins 15, 16) | Main power input | Supplies high-side switch and internal LDO; requires local 10µF ceramic decoupling to PGND. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® compensation | Allows external compensation network optimization across wide load/output capacitor ranges - improves transient response without sacrificing stability. |
| Adjustable Burst Mode® clamp | SYNC/MODE pin voltage (0.42V–1V) directly sets minimum peak inductor current - enables fine-tuning of light-load ripple vs. efficiency trade-off. |
| 99% maximum duty cycle | Supports ultra-low dropout operation down to VOUT ≈ VIN − IOUT × 45mΩ - maintains regulation even during brownout conditions. |
| Overtemperature protection | Shuts down both switches at ~150°C junction temperature and auto-restarts at ~115°C - prevents thermal runaway in enclosed or high-ambient environments. |
| Integrated 5V LDO (INTVCC) | Provides regulated bias for internal circuitry and bootstrapping - eliminates need for external bias supply and simplifies layout. |
Applications
| Point-of-Load Regulation | Portable Instrumentation |
|---|---|
Use Scenario: Powering FPGA core voltage (e.g., 0.9V/1.2V) on a dense PCB with tight space constraints and strict EMI limits. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated, low-noise DC power with fast transient response. Use Value: Internal 45mΩ/85mΩ MOSFETs and OPTI-LOOP® compensation deliver >90% efficiency at 1A–2.5A loads while minimizing board area and external component count. | Use Scenario: Battery-powered handheld test equipment requiring long runtime and stable analog front-end supply. IC Role / Device Role / Timing Role: Main system power converter enabling low-quiescent-current operation during standby and high-efficiency delivery during active measurement cycles. Use Value: 75µA quiescent current in Burst Mode® extends battery life; PGOOD output coordinates microcontroller wake-up and peripheral enable sequencing. |
| Communications Infrastructure | Industrial Control Systems |
Use Scenario: Providing isolated 3.3V/5V rails for Ethernet PHYs, SerDes interfaces, and management controllers in base station line cards. IC Role / Device Role / Timing Role: High-reliability, thermally robust DC/DC stage meeting extended temperature (-40°C to 125°C) and long-lifecycle requirements. Use Value: eMSOP package with soldered exposed pad ensures thermal performance in convection-cooled chassis; overvoltage/overtemperature protections enhance field reliability. | Use Scenario: Powering PLC I/O modules and sensor interface circuits in factory automation cabinets with variable 12V/24V DC input. IC Role / Device Role / Timing Role: Input-flexible buck converter supporting wide input range and delivering clean, sequenced outputs for mixed-signal subsystems. Use Value: TRACK/SS pin enables coordinated startup with CPU core voltage; 4.5V–15V input range accommodates unregulated industrial supplies with ripple and transients. |
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 |
|---|---|---|---|
| LTC3603EUF#PBF | Same electrical specs; 20-lead 4mm × 4mm QFN package with lower θJA (37°C/W) and larger exposed pad. | Better thermal performance in high-power-density or high-ambient designs; requires different PCB footprint. | Select when thermal dissipation exceeds eMSOP capability or when board layout favors QFN routing. |
| MP2315DJ-LF-Z | 2.5A, 4.5V–28V input, fixed 1MHz freq, no PGOOD or TRACK/SS; 10-pin SOIC-EP package. | Lacks voltage tracking, soft-start control, and power-good signaling - suitable only for simpler, cost-sensitive applications. | Choose only if design does not require sequencing, monitoring, or adjustable light-load behavior. |
Compared with LTC3603EUF#PBF, the LTC3603EMSE#PBF offers identical regulation performance in a smaller footprint but higher thermal resistance; versus MP2315DJ-LF-Z, it provides superior system integration features (PGOOD, TRACK/SS, Burst Mode® adjustability) at higher BOM cost and complexity.
Availability
LTC3603EMSE#PBF is available at Aetrix Electronics and suitable for point-of-load supplies, portable instrumentation, and communications infrastructure requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to 125°C operation.
Supply support for LTC3603EMSE#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 LTC3603EMSE#PBF belongs to Linear's monolithic synchronous buck regulator family, designed specifically for high-efficiency, low-noise, thermally constrained point-of-load applications in industrial, telecom, and embedded systems.
FAQ
What is the maximum output current capability of the LTC3603EMSE#PBF?
The LTC3603EMSE#PBF delivers up to 2.5A of continuous output current under typical thermal conditions (θJA = 45°C/W, TA ≤ 85°C). Actual achievable current depends on input-output voltage differential, ambient temperature, PCB copper area, and airflow. At 12VIN/3.3VOUT, it sustains 2.5A with <15°C junction rise in a standard 2-layer board with 2oz copper and 1in² exposed pad.
Does the LTC3603EMSE#PBF support output voltage tracking?
Yes, the LTC3603EMSE#PBF supports voltage tracking via the TRACK/SS pin. Applying a ramp voltage (e.g., from another regulator's output) causes VOUT to follow that ramp until it reaches 0.6V, after which regulation transitions to the internal 0.6V reference. This enables precise power sequencing for multi-rail processors and FPGAs without external comparators or timers.
How is switching frequency set on the LTC3603EMSE#PBF?
Switching frequency on the LTC3603EMSE#PBF is set by an external resistor (ROSC) connected between the RT pin and ground. Using ROSC = 105kΩ yields ~1MHz (per datasheet Figure TA01); the full range is 300kHz to 3MHz. The formula ROSC = (1.15 × 10¹¹ / fHz) – 10kΩ applies, with minimum on-time (95ns) limiting practical minimum duty cycle.
What protection features are integrated into the LTC3603EMSE#PBF?
The LTC3603EMSE#PBF integrates overtemperature shutdown (trip at ~150°C, restart at ~115°C), PVIN overvoltage lockout (~16.5V), output overvoltage protection (PGOOD deassertion + bottom switch activation), and short-circuit current limiting (valley current >4.5A triggers cycle skipping). These operate autonomously without external components.
Can the LTC3603EMSE#PBF operate with input voltage below 4.5V?
No - the absolute minimum operating PVIN is 4.5V per the Electrical Characteristics table. Below this, the internal 5V INTVCC LDO cannot regulate, causing functional failure. While the Absolute Maximum Rating allows transient PVIN down to –0.3V, sustained operation below 4.5V violates specification and risks unstable regulation or undervoltage lockout activation.
LTC3603EMSE#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
LTC3603EMSE#PBF FAQ
1.How can I place an order for LTC3603EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3603EMSE#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 LTC3603EMSE#PBF reliable?
The price and inventory of LTC3603EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3603EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3603EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3603EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3603EMSE#PBF?
LTC3603EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3603EMSE#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 LTC3603EMSE#PBF?
For technical support, including LTC3603EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3603EMSE#PBF requirements.
6.How does Aetrix verify that LTC3603EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3603EMSE#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 LTC3603EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3603EMSE#PBF?
All LTC3603EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3603EMSE#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 LTC3603EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3603EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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