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Analog Devices Inc. LTC3602EUF#PBF
- Part No.:
- LTC3602EUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3602EUF#PBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,006
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Product details
Overview
LTC3602EUF#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, 75μA quiescent current in Burst Mode, and a power-good output. It is used in point-of-load supplies for server backplanes and battery-powered instrumentation.
For engineers reviewing the LTC3602EUF#PBF datasheet, LTC3602EUF#PBF pinout, LTC3602EUF#PBF application, or LTC3602EUF#PBF equivalent, key selection considerations include its 20-pin 4mm × 4mm QFN package, OPTI-LOOP® compensation for transient optimization, programmable Burst Mode clamp, SYNC/MODE pin for forced continuous or synchronized operation, and integrated 5V INTVCC LDO.
Technical Context
The LTC3602EUF#PBF implements constant-frequency current-mode control with internal slope compensation recovery to stabilize operation above 30% duty cycle and maintain peak inductor current consistency. Its dual-MOSFET synchronous architecture eliminates external diode losses and supports 99% maximum duty cycle during dropout.
It provides three operational modes via the SYNC/MODE pin: forced continuous (for low-noise applications), Burst Mode (for high light-load efficiency), and external clock synchronization (300kHz–3MHz). The ITH pin serves as both error amplifier output and burst comparator input, while TRACK/SS enables voltage tracking or external soft-start with 1.25μA pull-up current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 10V - supports single-cell Li-ion, 5V rail, and intermediate bus architectures without pre-regulation. |
| Output Current | Up to 2.5A - sufficient for FPGA core rails, DSP I/O, and ASIC point-of-load conversion. |
| Switch RDS(ON) | 65mΩ (top), 90mΩ (bottom) - enables >90% efficiency at 2.5A with minimal thermal rise in QFN package. |
| Quiescent Current | 75μA in Burst Mode - extends battery life in portable instruments and always-on sensor nodes. |
| Reference Voltage | 0.6V ±1% - allows precise low-voltage regulation down to sub-1V logic supplies with tight tolerance. |
| Switching Frequency | 300kHz to 3MHz (resistor- or clock-set) - balances inductor size (e.g., 2.2μH @ 1MHz) vs. efficiency trade-offs. |
| Power Good Output | Open-drain, ±10% window - provides reliable system-level power sequencing and fault indication. |
Pinout & Package
Package: 20-lead (4mm × 4mm) plastic QFN with exposed SGND pad (Pin 21), θJA = 37°C/W, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (Pins 1,2) | Main power input | Accepts 4.5V–10V; requires local ceramic decoupling to PGND to suppress high di/dt switching noise. |
| 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 | Tie to INTVCC for forced continuous mode; apply 0.42V–1V for Burst Mode; feed external 300kHz–3MHz clock for synchronization. |
| PGOOD (Pin 5) | Power-good status indicator | Open-drain output pulled low if VOUT deviates >±10% - used for processor reset or system enable sequencing. |
| RT (Pin 6) | Oscillator timing set | Connect resistor to GND to program fSW; 105kΩ yields ~1MHz - sets ripple-current and inductor sizing constraints. |
| ITH (Pin 7) | Error amplifier output / burst comparator input | Carries compensation signal; voltage level determines peak inductor current and triggers sleep mode at ≤330mV in Burst Mode. |
| VFB (Pin 8) | Feedback reference node | Monitors resistive divider output; regulates VOUT to 0.6V on this pin - enables precise output programming with <1% tolerance. |
| RUN (Pin 10) | Enable control input | Logic-high (>0.7V) enables regulator; tie to PVIN for always-on operation or drive externally for power sequencing. |
| TRACK/SS (Pin 11) | Tracking/soft-start control | Apply ramp voltage for supply tracking; add capacitor for external soft-start; floating defaults to 1ms internal ramp. |
| PGND (Pins 12–15) | Power ground return | Low-impedance path for high-current switch node return - must be connected directly to exposed pad and thermal plane. |
| SW (Pins 16–19) | Switch node connection | Drives external inductor; experiences full VIN-to-GND swing at fSW - requires short, low-inductance PCB trace layout. |
| BOOST (Pin 20) | Bootstrap supply for top gate driver | Charged via internal diode from SW; requires 0.1μF ceramic capacitor between BOOST and SW for proper high-side FET turn-on. |
| SGND (Pin 21) | Signal ground reference | 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 external RC network on ITH to optimize transient response across wide load/output capacitor ranges without stability compromise. |
| Adjustable Burst Mode Clamp | Voltage on SYNC/MODE pin sets minimum peak inductor current (0–3.5A), enabling direct control of output ripple vs. light-load efficiency trade-off. |
| Synchronous Dual MOSFETs | Integrated 65mΩ/90mΩ switches eliminate Schottky loss and reduce thermal footprint - no external diode required. |
| 99% Maximum Duty Cycle | Supports ultra-low dropout operation (e.g., 5V→4.5V) by forcing top switch on for multiple cycles with periodic 85ns bottom-switch refresh. |
| Overtemperature Protection | Shuts down both switches at ~150°C junction temperature and auto-restarts below 115°C - prevents thermal runaway in enclosed or high-ambient designs. |
Applications
| Point-of-Load Supplies | Portable Instruments |
|---|---|
Use Scenario: Regulating 3.3V/2.5A for FPGA core logic from a 7V intermediate bus in telecom line cards. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing dynamic load transients and providing PGOOD sequencing signal. Use Value: OPTI-LOOP® compensation maintains stability with 22μF ceramic output capacitance, while 75μA quiescent current minimizes standby power draw. | Use Scenario: Powering a handheld spectrum analyzer's ADC and RF front-end from dual Li-ion cells (7.2V–8.4V). IC Role / Device Role / Timing Role: Main DC/DC converter delivering regulated 1.8V and 3.3V rails with precise tracking during startup. Use Value: TRACK/SS pin enables coordinated ramp-up of analog and digital supplies to prevent latch-up, while Burst Mode extends battery runtime at idle. |
| Server Backplane Power | Battery-Powered Devices |
Use Scenario: Generating 1.2V/2.5A for CPU I/O voltage on a 1U server motherboard with strict EMI limits. IC Role / Device Role / Timing Role: Synchronous step-down regulator operating in forced continuous mode to avoid audible noise and keep switching harmonics out of sensitive bands. Use Value: SYNC/MODE pin tied to INTVCC ensures fixed-frequency operation; 1MHz switching allows compact 2.2μH inductor and low-profile layout. | Use Scenario: Supplying 5V/2.5A to a portable medical monitor's display and data acquisition subsystem from a 9V primary battery. IC Role / Device Role / Timing Role: High-efficiency buck converter supporting wide input range and delivering stable output under varying load and temperature. Use Value: 4.5V–10V input range accommodates full battery discharge curve; 0.6V reference enables accurate low-voltage feedback with standard resistor tolerances. |
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 |
|---|---|---|---|
| MP2315DJ-LF-Z | 3A rating, 4.5V–28V input, fixed 500kHz fSW, no SYNC or TRACK pins, 300μA IQ | Lacks programmable Burst Mode clamp, tracking, and external sync - suitable only for fixed-output, non-sequencing applications. | Select when cost and simplicity outweigh need for advanced control features and light-load efficiency. |
| TPS54227PWPR | 2.5A, 4.5V–18V input, 700kHz fSW, integrated compensation, no OPTI-LOOP®, 125μA IQ | Uses internal compensation (no ITH access), no adjustable burst clamp, lower max duty cycle (90%) - less flexible for aggressive transient or dropout requirements. | Choose for TI-ecosystem designs where external compensation tuning and ultra-low IQ are not critical. |
Compared with MP2315DJ-LF-Z and TPS54227PWPR, the LTC3602EUF#PBF offers superior light-load efficiency via adjustable Burst Mode, precise transient response tuning via OPTI-LOOP®, and robust dropout capability up to 99% duty cycle - making it preferred for high-performance, thermally constrained, or battery-sensitive applications.
Availability
LTC3602EUF#PBF is available at Aetrix Electronics and suitable for point-of-load supplies, portable instrumentation, server backplane power, and battery-powered devices requiring stable component supply across industrial temperature ranges.
Supply support for LTC3602EUF#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 continues its legacy of high-performance power management ICs with precision, efficiency, and reliability.
The LTC3602EUF#PBF belongs to Linear's monolithic synchronous buck regulator product line, designed specifically for demanding point-of-load applications where small solution size, fast transient response, and high light-load efficiency are critical.
FAQ
What is the maximum output current capability of the LTC3602EUF#PBF?
The LTC3602EUF#PBF delivers up to 2.5A of continuous output current under typical thermal conditions (TA = 25°C, 4-layer PCB with 2oz copper and thermal pad soldered). Derating applies above 85°C ambient or with reduced airflow; the device includes overtemperature protection that disables switching above ~150°C junction temperature to prevent damage. Actual achievable current depends on input voltage, output voltage, inductor DCR, and PCB thermal design.
How does the SYNC/MODE pin configure operational modes on the LTC3602EUF#PBF?
The SYNC/MODE pin on the LTC3602EUF#PBF selects among three distinct modes: tying it to INTVCC forces continuous conduction mode (reducing EMI but increasing light-load IQ); applying 0.42V–1V enables Burst Mode with adjustable clamp level; and feeding an external 300kHz–3MHz clock synchronizes switching. Pulse-skipping is activated by grounding SYNC/MODE. Each mode alters ITH behavior and sleep activation thresholds, directly impacting efficiency, ripple, and noise profiles.
Can the LTC3602EUF#PBF support output voltages below 1V?
Yes, the LTC3602EUF#PBF supports output voltages as low as 0.6V due to its precision 0.6V ±1% internal reference. Using a standard resistor divider (e.g., R1 = 100kΩ, R2 = 100kΩ for 1.2V), designers achieve sub-1V outputs with high accuracy. Layout best practices - including Kelvin sensing of VFB, short traces, and low-ESR ceramic capacitors - are essential to maintain regulation accuracy and transient performance at low VOUT.
What thermal considerations apply to the LTC3602EUF#PBF in its 4mm × 4mm QFN package?
The LTC3602EUF#PBF uses a 20-lead 4mm × 4mm QFN with exposed SGND pad (Pin 21) and θJA = 37°C/W. For reliable 2.5A operation, the exposed pad must be fully soldered to a dedicated thermal plane with ≥4 thermal vias (0.3mm diameter) connecting to inner/ground layers. Ambient temperature must stay ≤85°C; junction temperature should remain <125°C under steady-state load. Thermal shutdown activates at ~150°C and auto-restarts below 115°C.
Does the LTC3602EUF#PBF require an external Schottky diode?
No, the LTC3602EUF#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 switches eliminate conduction losses associated with diode forward voltage drop, improving efficiency by 3–5% compared to asynchronous designs and simplifying bill-of-materials and layout. No external diode or catch diode is needed or recommended.
LTC3602EUF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN 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:
- 20-QFN (4x4)
LTC3602EUF#PBF FAQ
1.How can I place an order for LTC3602EUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3602EUF#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 LTC3602EUF#PBF reliable?
The price and inventory of LTC3602EUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3602EUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3602EUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3602EUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3602EUF#PBF?
LTC3602EUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3602EUF#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 LTC3602EUF#PBF?
For technical support, including LTC3602EUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3602EUF#PBF requirements.
6.How does Aetrix verify that LTC3602EUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3602EUF#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 LTC3602EUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3602EUF#PBF?
All LTC3602EUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3602EUF#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 LTC3602EUF#PBF part is unused and in its original packaging.
Return procedure for LTC3602EUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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