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Analog Devices Inc. LTC3603EUF#TRPBF
- Part No.:
- LTC3603EUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3603EUF#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,367
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Product details
Overview
LTC3603EUF#TRPBF 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 - deployed in point-of-load power supplies for FPGA core rails.
For engineers reviewing the LTC3603EUF#TRPBF datasheet, LTC3603EUF#TRPBF pinout, LTC3603EUF#TRPBF application, or LTC3603EUF#TRPBF equivalent, key selection considerations include its 20-lead 4mm × 4mm QFN package, OPTI-LOOP® compensation for transient optimization, ±1% 0.6V reference accuracy, 75µA quiescent current in Burst Mode, and thermal performance validated to –40°C to 125°C junction temperature.
Technical Context
The LTC3603EUF#TRPBF implements constant-frequency current-mode control with internal slope compensation recovery to maintain peak inductor current stability above 30% duty cycle. Its dual N-channel synchronous switches enable high-efficiency operation without external diodes, while the ITH pin serves as both error amplifier output and burst comparator input for mode transition control.
It integrates a 5V INTVCC LDO, programmable soft-start via TRACK/SS, and robust protection including overtemperature shutdown (~150°C), PVIN overvoltage lockout (~16.5V), and overcurrent limiting (4.5A typical). The SYNC/MODE pin enables three distinct operating modes: forced continuous (SYNC/MODE = INTVCC), Burst Mode (0.42V–1V), or pulse-skipping (SYNC/MODE = GND).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 15V DC - supports wide industrial and telecom input rails without pre-regulation |
| Output Current | Up to 2.5A - sufficient for powering mid-power FPGA cores or ASIC I/O banks |
| Output Voltage Range | 0.6V to 14.5V - set by external resistor divider; 0.6V ±1% reference enables precise low-voltage regulation |
| Switching Frequency | 300kHz to 3MHz - externally resistor-programmable or synchronizable to external clock for EMI control |
| Quiescent Current | 75µA in Burst Mode - extends battery life in portable instrumentation during standby |
| Internal Switch RDS(ON) | Top: 45mΩ, Bottom: 85mΩ - eliminates Schottky diode, improves full-load efficiency by ~3–5% |
| Thermal Performance | θJA = 37°C/W, θJC = 5°C/W - requires exposed pad soldered to PCB ground plane for rated thermal dissipation |
Pinout & Package
Package: 20-lead (4mm × 4mm) plastic QFN with exposed thermal pad (Pin 21 = SGND). Requires soldering of exposed pad to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (Pins 1, 2) | Main power input supply | Accepts 4.5V–15V; must be decoupled locally to PGND with low-ESR capacitor |
| SW (Pins 16–19) | Switch node connection | Drives external inductor; high dv/dt node requiring minimized trace area and proximity to PGND |
| PGND (Pins 12–15) | Power ground return | Low-impedance path for high-current switch return; separate from SGND in layout |
| BOOST (Pin 20) | Bootstrap supply for top gate driver | Charged via internal diode from SW; requires 0.1µF ceramic capacitor to SW |
| INTVCC (Pin 3) | 5V internal LDO output | Powers internal circuitry; can source external bias if load ≤50mA |
| VFB (Pin 8) | Feedback voltage sensing | Monitors resistive divider output; regulates VOUT to 0.6V at this pin |
| ITH (Pin 7) | Error amplifier compensation node | Connects external RC network for loop stability; also used by burst comparator |
| TRACK/SS (Pin 11) | Voltage tracking / soft-start input | Enables output voltage sequencing with other rails or external soft-start ramp |
| RUN (Pin 10) | Enable control input | Active-high; threshold 0.4V–1.1V; tie to PVIN for always-on operation |
| PGOOD (Pin 5) | Open-drain power-good indicator | Asserts low when VOUT deviates >±10% from target; requires pull-up resistor |
| SYNC/MODE (Pin 4) | Mode select / clock sync input | Determines operating mode: forced continuous, Burst Mode, or pulse-skipping |
| RT (Pin 6) | Frequency set resistor connection | Resistor to GND sets oscillator frequency per ROSC = 1.15×10¹¹/f − 10kΩ |
| SGND (Pin 9, Exposed Pad Pin 21) | Signal ground reference | Reference for feedback, error amp, and logic; must connect exposed pad to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® compensation | Allows single-pole compensation network to optimize transient response across wide output capacitance range (10µF–1000µF) |
| Adjustable Burst Mode® clamp | Voltage on SYNC/MODE pin directly programs minimum peak inductor current (IBURST = 6A/V × [VS/M − 0.42V]) |
| 99% maximum duty cycle | Enables ultra-low dropout operation down to VIN − VOUT ≈ 150mV at full load via forced BOOST recharge every 16 cycles |
| Integrated 5V INTVCC LDO | Stable internal bias rail eliminates need for external VCC supply; regulated to 4.7V–5.1V with <±2% variation |
| Overtemperature protection | Shuts down both switches at ~150°C junction temperature; auto-restarts after cooling to ~115°C |
| Power Good (PGOOD) monitor | Open-drain output with ±10% to ±12% window ensures reliable system power sequencing and fault detection |
Applications
| FPGA Core Power Supply | Portable Test Instrumentation |
|---|---|
Use Scenario: Providing stable 1.2V/2.5A core voltage to Xilinx Artix-7 FPGA under dynamic load conditions. IC Role / Device Role / Timing Role: Primary point-of-load regulator with fast transient response and precise low-voltage regulation. Use Value: OPTI-LOOP® compensation maintains stability with ceramic output capacitors; 75µA Burst Mode quiescent current extends battery runtime during idle periods. |
Use Scenario: Powering mixed-signal data acquisition modules in handheld oscilloscopes with variable processing loads. IC Role / Device Role / Timing Role: Synchronous buck converter enabling high-efficiency conversion from Li-ion battery (3.0–4.2V) or USB 5V input. Use Value: 45mΩ/85mΩ internal MOSFETs eliminate external diode losses; programmable frequency avoids noise coupling into analog front-end bandwidth. |
| Communications Baseband Processing | Industrial PLC I/O Module |
Use Scenario: Generating 3.3V/2.5A supply for LTE baseband processors requiring low EMI and tight voltage tolerance. IC Role / Device Role / Timing Role: EMI-optimized DC/DC regulator with external clock synchronization capability. Use Value: SYNC/MODE pin allows locking to system clock to shift switching harmonics out of sensitive RF bands; PGOOD enables processor reset coordination. |
Use Scenario: Delivering ruggedized 5V/2A supply for digital I/O isolators and CAN transceivers in factory automation controllers. IC Role / Device Role / Timing Role: Industrial-grade power management IC with extended temperature support and overvoltage/overtemperature protection. Use Value: –40°C to 125°C operating range and 16.5V PVIN OVP ensure reliability in harsh environments; exposed QFN pad enhances thermal margin under sustained load. |
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 |
|---|---|---|---|
| LT8610EMSE#TRPBF | Higher input range (3.0V–42V), lower IQ (2.5µA), but max 1.5A output; 16-pin eMSOP only | Better suited for automotive 12V systems with ultra-low standby power; not pin-compatible | Select when input exceeds 15V or sub-µA quiescent current is critical; verify layout compatibility |
| TPS54227PWPR | 2.5A output, 4.5V–18V input, but no Burst Mode; fixed 500kHz/1MHz options; 16-pin HTSSOP | Lower cost for non-battery applications where light-load efficiency is secondary | Choose for cost-sensitive industrial designs without sequencing or ultra-low-IQ requirements |
Compared with LT8610EMSE#TRPBF and TPS54227PWPR, the LTC3603EUF#TRPBF uniquely balances 2.5A capability, 4.5V–15V input, Burst Mode efficiency, and QFN thermal performance - making it optimal for space-constrained, thermally demanding point-of-load applications where precise low-voltage regulation and sequencing are required.
Availability
LTC3603EUF#TRPBF is available at Aetrix Electronics and suitable for FPGA core power supplies, portable test instrumentation, and communications baseband processing requiring stable component supply across industrial temperature grades and long-term production continuity.
Supply support for LTC3603EUF#TRPBF 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 characterization and long-term product support.
The LTC3603EUF#TRPBF belongs to Linear's monolithic synchronous buck regulator family, designed specifically for high-efficiency, low-noise point-of-load conversion in space- and thermal-constrained applications such as portable instruments and communications infrastructure.
FAQ
What is the maximum junction temperature rating for the LTC3603EUF#TRPBF?
The LTC3603EUF#TRPBF has a maximum junction temperature (TJMAX) of 125°C and incorporates overtemperature protection that disables both power switches at approximately 150°C. It automatically restarts once the junction cools below ~115°C. This thermal shutdown behavior is fully characterized and guaranteed across the –40°C to 125°C operating junction temperature range.
Can the LTC3603EUF#TRPBF operate with an input voltage lower than 4.5V?
No - the LTC3603EUF#TRPBF is specified for operation only within the 4.5V to 15V input voltage range. Operation below 4.5V violates the Absolute Maximum Ratings and may result in failure to start, unstable regulation, or undefined behavior. For sub-4.5V inputs, consider alternatives like the LT8610 or LTC3638.
How is the switching frequency set on the LTC3603EUF#TRPBF?
The switching frequency of the LTC3603EUF#TRPBF is set using an external resistor (ROSC) connected between the RT pin and ground. The relationship is ROSC = (1.15 × 10¹¹)/f − 10kΩ, supporting 300kHz to 3MHz. For example, a 105kΩ resistor yields ~1MHz nominal frequency. Alternatively, the SYNC/MODE pin accepts an external 5V clock signal within the same frequency range.
Does the LTC3603EUF#TRPBF require an external Schottky diode?
No - the LTC3603EUF#TRPBF integrates synchronous N-channel MOSFETs (45mΩ top, 85mΩ bottom) and eliminates the need for an external Schottky diode. This reduces component count, improves full-load efficiency by ~3–5%, and simplifies layout. No external diode or catch diode is required or recommended.
What is the function of the exposed thermal pad on the LTC3603EUF#TRPBF QFN package?
The exposed thermal pad (Pin 21) on the LTC3603EUF#TRPBF is electrically and thermally connected to SGND. It must be soldered to a PCB copper pour tied to signal ground to achieve the specified θJA = 37°C/W and θJC = 5°C/W thermal performance. Failure to solder the pad degrades thermal dissipation and may cause premature thermal shutdown under load.
LTC3603EUF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- 20-QFN (4x4)
LTC3603EUF#TRPBF FAQ
1.How can I place an order for LTC3603EUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3603EUF#TRPBF 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 LTC3603EUF#TRPBF reliable?
The price and inventory of LTC3603EUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3603EUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3603EUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3603EUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3603EUF#TRPBF?
LTC3603EUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3603EUF#TRPBF 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 LTC3603EUF#TRPBF?
For technical support, including LTC3603EUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3603EUF#TRPBF requirements.
6.How does Aetrix verify that LTC3603EUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3603EUF#TRPBF 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 LTC3603EUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3603EUF#TRPBF?
All LTC3603EUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3603EUF#TRPBF, 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 LTC3603EUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3603EUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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