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Analog Devices Inc. LTC3602IUF#TRPBF
- Part No.:
- LTC3602IUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3602IUF#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,023
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Product details
Overview
LTC3602IUF#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 10V input, with adjustable 0.6V–9.5V output and 1MHz switching frequency. It integrates 65mΩ top / 90mΩ bottom MOSFETs, features OPTI-LOOP® compensation, Burst Mode® operation, and a power-good output - used in point-of-load supplies for server backplanes and portable instrumentation.
For engineers reviewing the LTC3602IUF#TRPBF datasheet, LTC3602IUF#TRPBF pinout, LTC3602IUF#TRPBF application, or LTC3602IUF#TRPBF equivalent, key selection considerations include its 20-pin 4mm × 4mm QFN package, 75μA quiescent current in Burst Mode, ±1% 0.6V reference accuracy, programmable burst clamp, and synchronization capability across 300kHz–3MHz.
Technical Context
The LTC3602IUF#TRPBF employs constant-frequency current-mode control with internal slope compensation active above 30% duty cycle to prevent subharmonic oscillation. Its dual-MOSFET synchronous architecture eliminates external diode losses and supports >99% duty cycle in dropout via forced 85ns bottom-switch conduction every 16 cycles.
It offers three operational modes selected via SYNC/MODE pin voltage: forced continuous (SYNC/MODE = INTVCC), Burst Mode® (0.42V–1V), or pulse-skipping (SYNC/MODE = GND). The ITH pin serves as error amplifier output and burst comparator input, while TRACK/SS enables voltage tracking or external soft-start using a 1.25μA pull-up current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 10V - supports wide-range industrial and battery-derived rails including 5V, 7V, and 9V inputs without external regulators. |
| Output Current | Up to 2.5A - sufficient for powering FPGA cores, DSPs, and ASICs in compact embedded systems. |
| Switch RDS(ON) | Top: 65mΩ, Bottom: 90mΩ - enables high efficiency (>90% at 1A, 7VIN) without external Schottky diode. |
| Quiescent Current | 75μA in Burst Mode - extends battery life in portable instruments and low-power IoT edge nodes. |
| Feedback Reference | 0.6V ±1% - allows precise low-voltage regulation (e.g., 0.8V, 1.2V, 1.8V) with minimal resistor tolerance impact. |
| Switching Frequency | Programmable 300kHz–3MHz via RT resistor - balances inductor size (smaller at 2MHz) vs. efficiency (higher at 500kHz). |
| Power Good Output | Open-drain, ±10% window - provides reliable system-level power sequencing and fault detection for downstream logic. |
| Operating Temp | –40°C to +85°C - qualified for industrial temperature environments without derating. |
Pinout & Package
Package: 20-lead (4mm × 4mm) plastic QFN with exposed thermal pad (Pin 21 = SGND), θJA = 37°C/W, θJC = 10°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (Pins 1, 2) | Main power input | Accepts 4.5V–10V; requires local ceramic decoupling to PGND for high di/dt switching currents. |
| INTVCC (Pin 3) | Internal 5V LDO output | Supplies gate drivers and internal circuitry; must be bypassed with ≥1μF ceramic capacitor. |
| SYNC/MODE (Pin 4) | Mode select & sync input | Voltage level sets operation mode: GND = pulse-skip, 0.42–1V = Burst Mode, INTVCC = forced continuous. |
| PGOOD (Pin 5) | Power-good status indicator | Open-drain output pulled low if VOUT deviates >±10% - used for microcontroller reset or enable sequencing. |
| RT (Pin 6) | Oscillator timing node | Resistor to GND sets fSW; 105kΩ yields ~1MHz - critical for EMI filtering and inductor sizing. |
| ITH (Pin 7) | Error amplifier output | Compensation node for loop stability; also monitored by burst comparator to trigger sleep mode. |
| VFB (Pin 8) | Feedback input | Senses resistor divider output; regulates VOUT to 0.6V - determines output voltage via R1/R2 ratio. |
| RUN (Pin 10) | Enable control | Logic-high (>0.7V) enables regulator; tie to PVIN for always-on operation or drive externally for sequencing. |
| TRACK/SS (Pin 11) | Tracking/soft-start input | 1.25μA pull-up enables external soft-start cap or core-I/O voltage tracking for safe processor boot. |
| PGND (Pins 12–15) | Power ground return | Low-impedance path for high-current switch node return - must be connected to thermal pad and solid plane. |
| SW (Pins 16–19) | Switch node | Connects to inductor; carries full switching waveform - layout requires short, wide trace to minimize EMI. |
| BOOST (Pin 20) | Bootstrap supply | Charges floating gate driver for top MOSFET - requires 0.1μF ceramic between BOOST and SW. |
| SGND (Pin 21) | Signal ground | Exposed thermal pad - must be soldered to PCB ground plane for thermal performance and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows single-pole compensation network to optimize transient response across wide load/output capacitor ranges - reduces design iterations for varying board capacitance. |
| Adjustable Burst Clamp | External SYNC/MODE voltage sets minimum peak inductor current (0–3.5A), enabling precise trade-off between light-load efficiency and output ripple. |
| Synchronization Capability | Accepts external clock 300kHz–3MHz on SYNC/MODE pin - enables multi-rail phase alignment and EMI reduction in dense power systems. |
| 99% Maximum Duty Cycle | Supports ultra-low dropout operation down to VOUT + ~150mV (at 2.5A) - maintains regulation during brownout or battery sag conditions. |
| Overtemperature Protection | Shuts down both switches at ~150°C junction and auto-restarts at ~115°C - prevents thermal runaway in sealed enclosures or high ambient environments. |
| Integrated 5V LDO (INTVCC) | Provides clean, regulated supply for internal logic and gate drivers - eliminates need for external bias rail and simplifies BOM. |
Applications
| Point-of-Load Regulation | Portable Instrumentation |
|---|---|
Use Scenario: Powering FPGA core voltage (e.g., 0.85V/2A) from a 7V intermediate rail on a compact test equipment PCB. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated, low-noise DC output with fast transient response. Use Value: Delivers 2.5A at >92% efficiency with <1% load regulation, eliminating need for external post-regulation LDOs. | Use Scenario: Supplying 3.3V/2.5A to a handheld oscilloscope's analog front-end and ADC subsystem from a 2-cell Li-ion battery (6–8.4V). IC Role / Device Role / Timing Role: High-efficiency step-down converter operating in Burst Mode® to extend battery runtime during standby. Use Value: Achieves 75μA quiescent current and >85% efficiency at 10mA load - doubles battery life versus non-Burst alternatives. |
| Server Backplane Power | Battery-Powered Medical Sensors |
Use Scenario: Generating 1.2V/2.5A for PCIe slot auxiliary power on a telecom server backplane with strict EMI limits. IC Role / Device Role / Timing Role: Synchronizable buck converter locked to system clock to avoid beat frequencies in sensitive RF zones. Use Value: Enables deterministic 1MHz switching aligned to 1MHz master clock - suppresses conducted EMI peaks by >15dB. | Use Scenario: Providing stable 1.8V/1.5A to a wearable ECG sensor SoC with intermittent wireless transmission bursts. IC Role / Device Role / Timing Role: Low-noise, thermally robust regulator supporting rapid load transients and long idle periods. Use Value: Maintains <10mV output deviation during 0→2A step with 1ms internal soft-start - prevents sensor initialization faults. |
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 |
|---|---|---|---|
| TPS54227PWPR | Lower max output current (2A), fixed 500kHz fSW, no Burst Mode®, 16-pin HTSSOP only | Lacks light-load efficiency optimization and frequency flexibility - less suitable for battery-powered designs | Select when cost sensitivity outweighs efficiency needs and fixed frequency suffices. |
| MP2315GJ-Z | Higher IQ (300μA), no PGOOD, no SYNC, 12-pin QFN, 3A rating but larger footprint (3mm × 4mm) | No power-good monitoring or clock synchronization - limits use in sequenced or noise-sensitive systems | Choose for space-constrained boards where 3A headroom justifies trade-offs in control features. |
Compared with TPS54227PWPR and MP2315GJ-Z, the LTC3602IUF#TRPBF uniquely combines 2.5A capability, 75μA Burst Mode quiescent current, programmable frequency, PGOOD, and synchronization - making it optimal for industrial and portable applications demanding both efficiency and system-level control.
Availability
LTC3602IUF#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 lifecycle support, and guaranteed industrial temperature grade (–40°C to +85°C).
Supply support for LTC3602IUF#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 continues its legacy of high-performance power management ICs with precision, reliability, and application-focused design.
The LTC3602IUF#TRPBF belongs to Linear's monolithic synchronous buck regulator product line, engineered for high-efficiency, low-noise point-of-load conversion in space- and thermal-constrained industrial and portable systems.
FAQ
What is the maximum output current supported by the LTC3602IUF#TRPBF?
The LTC3602IUF#TRPBF delivers up to 2.5A of continuous output current under typical thermal conditions (θJA = 37°C/W, 2-layer PCB with thermal pad soldered). Peak current limit is 4.5A, but sustained 2.5A operation requires adequate copper area and airflow to maintain junction temperature below 125°C.
How does the LTC3602IUF#TRPBF achieve high efficiency at light loads?
The LTC3602IUF#TRPBF achieves high light-load efficiency via Burst Mode® operation, reducing quiescent current to 75μA. In this mode, the IC enters sleep state when load demand drops below the burst clamp threshold, disabling most internal circuitry while maintaining regulation via output capacitance - confirmed in Figure G11 of the datasheet.
Can the LTC3602IUF#TRPBF be synchronized to an external clock?
Yes, the LTC3602IUF#TRPBF can be synchronized to an external clock applied to the SYNC/MODE pin across 300kHz–3MHz. When synchronized, it operates in pulse-skipping mode, and the RT resistor should be set for ~25% lower frequency than the sync source to ensure stable locking - per Section "Frequency Synchronization" in the datasheet.
What is the purpose of the TRACK/SS pin on the LTC3602IUF#TRPBF?
The TRACK/SS pin on the LTC3602IUF#TRPBF serves dual functions: voltage tracking (e.g., coordinating core/I/O rail startup) and external soft-start. A 1.25μA internal current source allows an external capacitor to generate a controlled ramp; if slower than the internal 1ms ramp, it governs VOUT rise time - critical for preventing latch-up in processors and FPGAs.
Does the LTC3602IUF#TRPBF include overtemperature protection?
Yes, the LTC3602IUF#TRPBF incorporates overtemperature protection that disables both power switches when junction temperature reaches ~150°C. After cooling to ~115°C, it automatically restarts. This feature is independent of ambient temperature and ensures safe operation during overload or poor heatsinking - specified in Absolute Maximum Ratings and Operation sections.
LTC3602IUF#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):
- 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:
- 20-QFN (4x4)
LTC3602IUF#TRPBF FAQ
1.How can I place an order for LTC3602IUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3602IUF#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 LTC3602IUF#TRPBF reliable?
The price and inventory of LTC3602IUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3602IUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3602IUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3602IUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3602IUF#TRPBF?
LTC3602IUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3602IUF#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 LTC3602IUF#TRPBF?
For technical support, including LTC3602IUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3602IUF#TRPBF requirements.
6.How does Aetrix verify that LTC3602IUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3602IUF#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 LTC3602IUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3602IUF#TRPBF?
All LTC3602IUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3602IUF#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 LTC3602IUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3602IUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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