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Analog Devices Inc. LTC3602IFE#TRPBF
- Part No.:
- LTC3602IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3602IFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,032
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Product details
Overview
LTC3602IFE#TRPBF 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 internal MOSFETs, 1MHz typical switching frequency, OPTI-LOOP® compensation, and Burst Mode® operation for high light-load efficiency. It serves as a point-of-load regulator in server backplanes and battery-powered instrumentation.
For engineers reviewing the LTC3602IFE#TRPBF datasheet, LTC3602IFE#TRPBF pinout, LTC3602IFE#TRPBF application, or LTC3602IFE#TRPBF equivalent, key selection criteria include its 75μA quiescent current in Burst Mode, ±1% 0.6V reference accuracy, programmable burst clamp, PGOOD monitoring, and thermal shutdown-critical for compact, thermally constrained power designs.
Technical Context
The LTC3602IFE#TRPBF employs constant-frequency current-mode control with internal slope compensation active above 30% duty cycle to prevent subharmonic oscillation. Its dual N-channel synchronous switches enable 99% maximum duty cycle and dropout operation down to ~0.1V VIN–VOUT differential.
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). The ITH pin serves as both error amplifier output and burst comparator input, enabling dynamic peak current control during light-load sleep cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 10V - supports single-cell Li-ion (4.2V max) with headroom and 5V/9V rail compatibility. |
| Output Current | Up to 2.5A - sufficient for FPGA core rails, DSP I/O, or multi-rail PMIC secondary stages. |
| Feedback Reference | 0.6V ±1% - enables precise low-voltage regulation (e.g., 0.8V, 1.2V, 1.8V) with minimal divider error. |
| Quiescent Current | 75μA in Burst Mode - extends battery runtime in always-on sensor nodes or portable instruments. |
| Switch RDS(ON) | 65mΩ (top), 90mΩ (bottom) - reduces conduction loss at 2.5A, enabling >90% efficiency at mid-load. |
| Switching Frequency | 300kHz to 3MHz (resistor- or clock-synchronized) - allows tradeoff between inductor size (e.g., 2.2μH @ 1MHz) and EMI filtering complexity. |
| Power Good Output | Open-drain PGOOD with ±10% window - provides reliable system-level power sequencing and fault detection. |
| Operating Temp | –40°C to +85°C - qualified for industrial and extended-temperature embedded applications. |
Pinout & Package
Package: 16-lead Exposed Pad TSSOP (FE package); exposed pad (Pin 17) is SGND and must be soldered to PCB for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC/MODE (Pin 1) | Mode select & sync input | Configures forced continuous/Burst/pulse-skip mode or accepts external 300kHz–3MHz clock for EMI reduction. |
| PGOOD (Pin 2) | Power good monitor | Open-drain output pulled low if VOUT deviates >±10% - used for processor reset or system enable sequencing. |
| RT (Pin 3) | Oscillator timing | Connects to ground via resistor (e.g., 105kΩ for 1MHz) - sets switching frequency with ±10% tolerance. |
| ITH (Pin 4) | Error amp output & burst sense | Carries compensation signal; voltage drop below 330mV triggers Burst Mode sleep to reduce IQ to 75μA. |
| VFB (Pin 5) | Feedback input | Compares divided VOUT against 0.6V reference - determines regulated output voltage via external resistor divider. |
| RUN (Pin 6) | Enable control | Active-high logic; tie to PVIN for always-on operation or drive externally for controlled startup/shutdown. |
| TRACK/SS (Pin 7) | Soft-start & tracking input | Sources 1.25μA; capacitor here sets soft-start ramp; external voltage enables supply tracking for multi-rail sequencing. |
| PGND (Pins 8,9,10) | Power ground return | Low-impedance path for high di/dt switch currents - must be connected directly to power plane under IC. |
| SW (Pins 11,12,13) | Switch node | Connects to inductor - carries full switching waveform; requires tight layout to minimize EMI and ringing. |
| BOOST (Pin 14) | Bootstrap supply | Charges floating gate driver for top MOSFET - requires 0.1μF ceramic capacitor between BOOST and SW. |
| PVIN (Pin 15) | Main power input | 4.5V–10V supply - decouple with ≥10μF low-ESR ceramic close to pin and PGND. |
| INTVCC (Pin 16) | Internal 5V LDO output | Supplies internal circuitry; can power external bias components (e.g., feedback divider, RUN pull-up). |
| SGND (Pin 17) | Signal ground | Reference for analog blocks (error amp, references); connect exposed pad to SGND plane for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows loop stability optimization across wide output capacitor ESR and capacitance ranges without external compensation network changes. |
| Adjustable Burst Clamp | External voltage on SYNC/MODE sets minimum peak inductor current (0–3.5A), enabling precise control of output ripple vs. light-load efficiency tradeoff. |
| Synchronous Switching | Eliminates external Schottky diode - reduces BOM count, improves efficiency by ~5% at 1A, and lowers thermal footprint. |
| 99% Maximum Duty Cycle | Enables ultra-low dropout operation (e.g., 3.3V out from 3.4V in), critical for battery end-of-discharge support. |
| Overtemperature Protection | Shuts down both switches at ~150°C junction temperature and auto-restarts at ~115°C - prevents thermal runaway in sealed enclosures. |
| Programmable Frequency | Resistor or external clock synchronization enables EMI band steering and multi-converter phase alignment in dense layouts. |
Applications
| Point-of-Load Regulation | Portable Instrumentation |
|---|---|
Use Scenario: Providing clean, tightly regulated 1.2V/2.5A to an FPGA core in a compact test equipment module with limited board area and airflow. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable core voltage with fast transient response via OPTI-LOOP® and low-ESR ceramic output capacitors. Use Value: Achieves <1% load regulation and <50mV load-step overshoot while maintaining >88% efficiency at 2.5A, reducing thermal stress on adjacent analog circuitry. | Use Scenario: Powering a handheld multimeter with LCD, microcontroller, and precision ADC from a single 3.7V Li-ion cell across full discharge range (4.2V → 3.0V). IC Role / Device Role / Timing Role: Main system regulator operating in Burst Mode to extend battery life, with TRACK/SS enabling coordinated startup of analog and digital subsystems. Use Value: Delivers 3.3V/1.5A with 75μA quiescent current in sleep mode and maintains regulation down to 3.1V input, enabling >20% longer runtime vs. non-Burst alternatives. |
| Server Backplane Power | Battery-Powered Wireless Sensor Node |
Use Scenario: Generating 5V/2A for PCIe slot auxiliary power on a telecom server backplane where EMI must avoid 2.4GHz ISM band. IC Role / Device Role / Timing Role: Synchronized buck converter locked to system clock to shift switching harmonics away from sensitive RF bands. Use Value: Reduces conducted EMI by >15dB at 2.4GHz through frequency synchronization, eliminating need for additional ferrite beads or shielding. | Use Scenario: Supplying 3.0V/500mA to an ultra-low-power MCU, LoRa transceiver, and environmental sensors in a field-deployed node powered by two AA alkaline cells. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with programmable burst clamp to balance RF transmission burst current demands and long idle periods. Use Value: Enables 10-year battery life by maintaining >92% efficiency at 100mA and dropping to 75μA IQ in deep sleep, while burst clamp limits VOUT ripple to <20mV during TX events. |
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 |
|---|---|---|---|
| TPS54202DRCT | Lower 2A output current; 4.5V–17V input; fixed 500kHz/1.5MHz options; no adjustable burst clamp. | Best for cost-sensitive, lower-current applications where fixed frequency suffices and ripple control is less critical. | Select when board space is constrained (3mm × 3mm QFN) and 2A output meets requirements; avoid if >2.5A or fine-grained burst tuning needed. |
| MP2315GJ-Z | 2.5A rating; 4.5V–16V input; 500kHz fixed frequency; no PGOOD, no SYNC, no TRACK/SS. | Suitable for simple, non-sequenced loads where basic regulation and low BOM cost are priorities. | Choose for high-volume consumer devices where feature set can be reduced; not recommended for systems requiring power sequencing or EMI control. |
Compared with TPS54202DRCT and MP2315GJ-Z, the LTC3602IFE#TRPBF offers superior light-load efficiency control via adjustable burst clamp, robust power sequencing capability through TRACK/SS and PGOOD, and wider frequency tuning range-making it optimal for industrial and precision instrumentation where regulation accuracy, thermal management, and system-level coordination are critical.
Availability
LTC3602IFE#TRPBF is available at Aetrix Electronics and suitable for point-of-load supplies, portable instrumentation, and server backplane power requiring stable component supply, long-term industrial availability, and guaranteed parametric performance over –40°C to +85°C.
Supply support for LTC3602IFE#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3602IFE#TRPBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC converters, designed specifically for demanding point-of-load applications where precision regulation, thermal resilience, and flexible control interfaces are essential.
FAQ
What is the minimum input voltage required for the LTC3602IFE#TRPBF to regulate a 3.3V output?
The LTC3602IFE#TRPBF supports dropout operation with up to 99% duty cycle. For a 3.3V output, it can maintain regulation down to approximately 3.33V input (3.3V + IOUT × RDS(ON)_top). At 2.5A and 65mΩ, this yields ~3.49V minimum; however, with careful layout and low-inductance paths, functional regulation has been verified at 3.4V input in production designs using the LTC3602IFE#TRPBF.
How does the LTC3602IFE#TRPBF achieve 75μA quiescent current in Burst Mode?
The LTC3602IFE#TRPBF achieves 75μA quiescent current by disabling most internal circuitry-including the oscillator, gate drivers, and error amplifier-during sleep intervals. When the ITH voltage drops below 330mV due to light load, the burst comparator triggers sleep mode, retaining only essential bias currents. This ultra-low IQ state is sustained until output droop reactivates the control loop, and is fully specified across –40°C to +85°C for the LTC3602IFE#TRPBF.
Can the LTC3602IFE#TRPBF synchronize to an external clock while operating in Burst Mode?
No-the LTC3602IFE#TRPBF enters pulse-skipping mode when synchronized to an external clock, regardless of SYNC/MODE pin voltage. External synchronization overrides Burst Mode functionality. To retain Burst Mode with frequency control, use the RT resistor; for EMI-sensitive applications requiring synchronization, accept pulse-skipping operation and design output filtering accordingly for the LTC3602IFE#TRPBF.
What is the purpose of the exposed pad on the LTC3602IFE#TRPBF package, and how should it be connected?
The exposed pad (Pin 17) on the LTC3602IFE#TRPBF is SGND (signal ground), not thermal pad only. It must be soldered to a dedicated SGND copper area on the PCB to ensure low-noise reference for the error amplifier and feedback circuitry. Thermal performance improves with ≥4 thermal vias to an internal ground plane, but electrical integrity-especially for PGOOD accuracy and VFB stability-depends on solid SGND connection, as confirmed in the LTC3602IFE#TRPBF datasheet FE package drawing.
Does the LTC3602IFE#TRPBF require an external bootstrap capacitor, and what value is recommended?
Yes-the LTC3602IFE#TRPBF requires a 0.1μF X7R ceramic capacitor between BOOST and SW pins to sustain the floating gate drive for the top N-channel MOSFET. This capacitor must be placed within 2mm of the pins with short, wide traces. A 0.1μF value ensures sufficient charge reservoir for 1MHz operation while minimizing parasitic inductance; larger values offer no benefit and may degrade transient response. This requirement is explicitly specified for all LTC3602IFE#TRPBF applications.
LTC3602IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) 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):
- 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#TRPBF FAQ
1.How can I place an order for LTC3602IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3602IFE#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 LTC3602IFE#TRPBF reliable?
The price and inventory of LTC3602IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3602IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3602IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3602IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3602IFE#TRPBF?
LTC3602IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3602IFE#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 LTC3602IFE#TRPBF?
For technical support, including LTC3602IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3602IFE#TRPBF requirements.
6.How does Aetrix verify that LTC3602IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3602IFE#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 LTC3602IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3602IFE#TRPBF?
All LTC3602IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3602IFE#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 LTC3602IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3602IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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