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Analog Devices Inc. LTC3602IFE#PBF
- Part No.:
- LTC3602IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3602IFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,272
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Product details
Overview
LTC3602IFE#PBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC converter delivering up to 2.5A output current at adjustable 0.6V–9.5V from a 4.5V–10V input. It features 65mΩ top/90mΩ bottom MOSFETs, 1MHz typical switching frequency (300kHz–3MHz programmable), 75μA quiescent current in Burst Mode, and a Power Good (PGOOD) open-drain monitor. It is used in point-of-load power supplies for FPGA core rails and server backplane regulation.
For engineers reviewing the LTC3602IFE#PBF datasheet, LTC3602IFE#PBF pinout, LTC3602IFE#PBF application, or LTC3602IFE#PBF equivalent, key selection considerations include its 16-lead TSSOP package with exposed pad, OPTI-LOOP® compensation for transient optimization, selectable Burst Mode vs forced continuous operation, and internal 5V INTVCC LDO for gate drive bootstrapping.
Technical Context
The LTC3602IFE#PBF employs constant-frequency current-mode control with internal slope compensation active above 30% duty cycle to prevent subharmonic oscillation. Its peak-current limit is set by the ITH pin voltage and dynamically adjusted via error amplifier feedback against a 0.6V ±1% reference.
It supports three operating modes via the SYNC/MODE pin: forced continuous (SYNC/MODE = INTVCC), Burst Mode (0.42V–1V), or pulse-skipping (SYNC/MODE = GND). Overtemperature protection shuts down both switches above ~150°C and auto-restarts below 115°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 10V - supports single-cell Li+ or 5V/7V/9V intermediate bus rails without external pre-regulation. |
| Output Current | Up to 2.5A - sufficient for powering mid-tier FPGAs, DSPs, or ASIC cores directly at point-of-load. |
| Switch RDS(ON) | Top: 65mΩ, Bottom: 90mΩ - enables >90% efficiency at 2.5A load without external Schottky diode. |
| Quiescent Current | 75μA in Burst Mode - extends battery life in portable instruments during standby or light-load operation. |
| Reference Voltage | 0.6V ±1% - allows precise low-voltage outputs (e.g., 0.8V, 1.0V, 1.2V) with minimal tolerance stack-up. |
| Switching Frequency | 300kHz to 3MHz - adjustable via RT resistor; 1MHz typical enables compact 2.2μH inductor and ceramic capacitor designs. |
| Power Good Output | Open-drain PGOOD with ±10% threshold - provides system-level sequencing and fault detection for downstream logic. |
| Operating Temp | –40°C to +85°C - qualified for industrial and embedded computing environments with no derating required. |
Pinout & Package
Package: 16-lead plastic TSSOP with exposed pad (Pin 17), thermally enhanced for high-current DC/DC conversion. Exposed pad must be soldered to PCB for thermal and signal ground integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC/MODE (Pin 1) | Mode select & sync input | Determines operating mode: forced continuous (INTVCC), Burst Mode (0.42V–1V), or pulse-skipping (GND); also accepts external clock 300kHz–3MHz. |
| PGOOD (Pin 2) | Power good monitor | Open-drain output pulled low if VOUT deviates >±10% - used for system enable/disable sequencing and fault flagging. |
| RT (Pin 3) | Oscillator timing | Resistor-to-ground sets switching frequency; 105kΩ yields ~1MHz - enables layout-driven frequency tuning without changing IC. |
| ITH (Pin 4) | Error amplifier output | Compensation node for loop stability; connects to RC network - OPTI-LOOP® allows wide capacitor ESR range without instability. |
| VFB (Pin 5) | Feedback input | Senses resistive divider output; regulates to 0.6V reference - defines final output voltage per VOUT = 0.6V × (1 + R2/R1). |
| RUN (Pin 6) | Enable control | Active-high; ≥0.7V enables regulator - can be tied to PVIN for always-on operation or driven by microcontroller GPIO. |
| TRACK/SS (Pin 7) | Tracking/soft-start | Enables voltage tracking (e.g., I/O rail following core rail) or external soft-start via capacitor - prevents inrush and ensures safe power-up sequencing. |
| PGND (Pins 8,9,10) | Power ground | Low-impedance return path for high di/dt switch currents - must be connected to dedicated power plane under IC. |
| SW (Pins 11,12,13) | Switch node | Connects to inductor; carries full switching waveform - requires tight layout with minimal trace inductance to reduce EMI and ringing. |
| BOOST (Pin 14) | Bootstrap supply | Charges floating gate driver for top MOSFET - requires 0.1μF ceramic capacitor between BOOST and SW for reliable high-side conduction. |
| PVIN (Pin 15) | Main power input | 4.5V–10V supply input - must be decoupled with ≥10μF low-ESR ceramic capacitor close to pin to suppress input ripple. |
| INTVCC (Pin 16) | Internal LDO output | 5.0V ±2% regulated supply for internal circuitry and BOOT capacitor charging - powers logic, gate drivers, and error amp. |
| SGND (Pin 17) | Signal ground | Exposed pad; connects to PCB ground plane - critical for noise immunity, thermal dissipation, and reference stability. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous MOSFETs | Eliminates external Schottky diode, reduces conduction loss, and improves efficiency across full load range. |
| OPTI-LOOP® Compensation | Allows stable operation with wide variety of output capacitors (ceramic, polymer, tantalum) without redesigning compensation network. |
| Adjustable Burst Clamp | External control of minimum inductor peak current (0–3.5A) enables precise trade-off between light-load efficiency and output ripple. |
| 99% Effective Duty Cycle | Supports ultra-low dropout operation near VOUT - maintains regulation even when VIN drops to ~VOUT + 0.2V (at 2.5A). |
| Integrated 5V LDO (INTVCC) | Provides clean, regulated supply for internal logic and gate drivers - removes need for external bias rail and simplifies BOM. |
| Overtemperature Protection | Thermal shutdown at ~150°C with hysteresis - protects device during overload or poor heatsinking without requiring external thermal sensor. |
Applications
| Point-of-Load Regulation | Portable Instrument Power |
|---|---|
Use Scenario: Providing tightly regulated 1.2V/2.5A core supply to Xilinx Artix-7 FPGA on a compact test instrument PCB. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering stable, low-noise power with fast transient response to dynamic FPGA logic loads. Use Value: OPTI-LOOP® ensures stability with small ceramic output caps; Burst Mode extends battery runtime during idle periods. | Use Scenario: Powering a handheld spectrum analyzer with dual-rail requirements (3.3V I/O, 1.8V ADC core) and strict standby current limits. IC Role / Device Role / Timing Role: Main buck regulator generating 3.3V from Li+ battery; TRACK/SS pin used to sequence 1.8V rail via resistor divider. Use Value: 75μA quiescent current in Burst Mode minimizes self-discharge; PGOOD enables MCU-controlled power sequencing. |
| Server Backplane Supply | Battery-Powered Industrial Sensor |
Use Scenario: Generating 5V/2.5A auxiliary rail from 12V backplane for PCIe slot management controllers and hot-swap supervisors. IC Role / Device Role / Timing Role: High-efficiency intermediate converter operating from noisy 12V bus; synchronized to system clock via SYNC/MODE pin. Use Value: Synchronization eliminates beat frequencies with other converters; 90mΩ bottom switch reduces conduction loss at partial load. | Use Scenario: Regulating 3.3V from two-series LiFePO₄ cells (5.5V–7.2V) for wireless sensor node with RF transceiver and low-power MCU. IC Role / Device Role / Timing Role: Primary step-down regulator enabling long-term operation on primary battery; forced continuous mode selected to avoid RF interference in 2.4GHz band. Use Value: 1MHz fixed frequency avoids sensitive ISM bands; internal 5V LDO powers RF IC's VDDIO independently of main rail. |
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 |
|---|---|---|---|
| TPS54227PWR | Lower max current (2A), fixed 500kHz frequency, no Burst Mode, no PGOOD, smaller 8-pin SOIC package | Suitable for cost-sensitive, lower-power applications where light-load efficiency and sequencing are not critical | Select if board space is constrained and 2A output suffices; avoid if PGOOD or adjustable frequency required. |
| MP2315DJ-LF-Z | 2.5A rating, 2.2MHz fixed frequency, no PGOOD, no TRACK/SS, no Burst Mode adjustment, 8-pin SOIC | Better for ultra-compact layouts needing high frequency; lacks sequencing, monitoring, and light-load optimization features | Choose only for simple, low-cost 3.3V/5V rails where advanced control features are unnecessary. |
Compared with TPS54227PWR and MP2315DJ-LF-Z, the LTC3602IFE#PBF offers superior design flexibility through programmable frequency, adjustable Burst Mode clamp, integrated PGOOD, and robust thermal protection - making it preferred for industrial and embedded systems demanding reliability, efficiency, and precise power management.
Availability
LTC3602IFE#PBF is available at Aetrix Electronics and suitable for point-of-load supplies, portable instrumentation, and server backplane power requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for LTC3602IFE#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3602IFE#PBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC regulators, designed specifically for demanding point-of-load applications in industrial, communications, and test equipment where precision, reliability, and thermal robustness are essential.
FAQ
What is the maximum output current capability of the LTC3602IFE#PBF?
The LTC3602IFE#PBF delivers up to 2.5A of continuous output current when properly heatsinked on a PCB with adequate copper area and airflow. This rating assumes operation within the specified input voltage range (4.5V–10V), ambient temperature ≤85°C, and use of recommended external components including a 2.2μH inductor and low-ESR ceramic output capacitors. Derating applies above 85°C ambient.
Does the LTC3602IFE#PBF require an external Schottky diode?
No, the LTC3602IFE#PBF does not require an external Schottky diode because it integrates synchronous N-channel MOSFETs for both high-side and low-side switching. The 65mΩ top and 90mΩ bottom RDS(ON) values eliminate conduction losses associated with diode forward voltage drop, improving efficiency-especially at higher loads-and simplifying the bill of materials.
How is the switching frequency set on the LTC3602IFE#PBF?
The switching frequency of the LTC3602IFE#PBF is set using an external resistor connected between the RT pin (Pin 3) and ground. A 105kΩ resistor yields approximately 1MHz; frequency scales inversely with resistance across a 300kHz–3MHz range. Alternatively, the SYNC/MODE pin accepts an external clock signal from 300kHz to 3MHz to synchronize multiple converters and reduce EMI.
What is the function of the TRACK/SS pin on the LTC3602IFE#PBF?
The TRACK/SS pin (Pin 7) on the LTC3602IFE#PBF serves dual functions: voltage tracking and external soft-start. When a ramp voltage is applied, it forces the output to follow that ramp (e.g., for I/O rail sequencing). When a capacitor is connected to ground, it implements programmable soft-start. Leaving it floating defaults to internal 1ms soft-start. It must never be tied to INTVCC or PVIN to avoid damage.
Can the LTC3602IFE#PBF operate in dropout conditions?
Yes, the LTC3602IFE#PBF supports near-100% effective duty cycle operation via forced off-time insertion (~85ns every 16 cycles) to refresh the BOOST capacitor, enabling regulation when input voltage approaches output voltage. In dropout, VOUT ≈ VIN – (IOUT × RDS(ON)) – IOUT × RINDUCTOR, maintaining usable output down to VIN ≈ VOUT + 0.2V at full load.
LTC3602IFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm 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):
- 10V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 9.5V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LTC3602IFE#PBF FAQ
1.How can I place an order for LTC3602IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3602IFE#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 LTC3602IFE#PBF reliable?
The price and inventory of LTC3602IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3602IFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3602IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3602IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3602IFE#PBF?
LTC3602IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3602IFE#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 LTC3602IFE#PBF?
For technical support, including LTC3602IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3602IFE#PBF requirements.
6.How does Aetrix verify that LTC3602IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3602IFE#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 LTC3602IFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3602IFE#PBF?
All LTC3602IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3602IFE#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 LTC3602IFE#PBF part is unused and in its original packaging.
Return procedure for LTC3602IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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