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Analog Devices Inc. LTC3602IUF#PBF
- Part No.:
- LTC3602IUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3602IUF#PBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,310
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Product details
Overview
LTC3602IUF#PBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC converter delivering up to 2.5A at adjustable output voltages from 0.6V to 9.5V, operating from 4.5V–10V input. It integrates 65mΩ top and 90mΩ bottom N-channel MOSFETs, supports programmable 300kHz–3MHz switching, and features OPTI-LOOP® compensation for optimized transient response in point-of-load power supplies.
For engineers reviewing the LTC3602IUF#PBF datasheet, LTC3602IUF#PBF pinout, LTC3602IUF#PBF application, or LTC3602IUF#PBF equivalent, key selection considerations include its 20-pin 4mm × 4mm QFN package with exposed SGND pad, Burst Mode® operation enabling 75μA quiescent current, PGOOD monitoring, and external frequency synchronization capability.
Technical Context
The LTC3602IUF#PBF employs constant-frequency current-mode control with internal slope compensation active above 30% duty cycle to prevent subharmonic oscillation. Its dual-MOSFET architecture enables 99% maximum duty cycle in dropout, sustained via forced 85ns bottom-switch conduction every 16 cycles to refresh the BOOST capacitor.
It supports three operational 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, 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 |
| Output Current | Up to 2.5A - sufficient for FPGA core, DSP, or ASIC point-of-load rails |
| Switch RDS(ON) | 65mΩ (top), 90mΩ (bottom) - eliminates need for external Schottky diode and improves full-load efficiency |
| Quiescent Current | 75μA in Burst Mode - extends battery life in portable instruments and low-power standby states |
| Reference Voltage | 0.6V ±1% - enables precise low-voltage regulation down to 0.6V for modern logic cores |
| Switching Frequency | 300kHz to 3MHz - selectable via RT resistor or external clock for EMI management and size optimization |
| Power Good Output | Open-drain PGOOD with ±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 for high di/dt switching currents |
| INTVCC (Pin 3) | Internal 5V LDO output | Supplies gate drivers and internal circuitry; powers BOOST capacitor via internal charge pump |
| SYNC/MODE (Pin 4) | Mode select & sync input | Determines operation mode: forced continuous, Burst Mode®, or pulse-skipping; accepts external clock 300kHz–3MHz |
| PGOOD (Pin 5) | Power good monitor | Open-drain output pulled low if VOUT deviates >±10% - used for system enable/disable sequencing |
| RT (Pin 6) | Oscillator timing | Resistor-to-ground sets switching frequency; 105kΩ yields ~1MHz nominal operation |
| ITH (Pin 7) | Error amp output / burst sense | Compensation node for loop stability; also monitored by burst comparator to trigger sleep mode at 330mV |
| VFB (Pin 8) | Feedback input | Connects to resistor divider; regulates output by comparing to 0.6V reference |
| RUN (Pin 10) | Enable control | Active-high; ≥0.7V enables regulator - tied to PVIN for always-on operation |
| TRACK/SS (Pin 11) | Tracking/soft-start input | Enables voltage sequencing (e.g., core/I/O rails) or external soft-start via capacitor; 1.25μA internal pull-up |
| PGND (Pins 12–15) | Power ground | High-current return path for switches; must be connected to thermal pad and low-impedance ground plane |
| SW (Pins 16–19) | Switch node | Connects to inductor; carries high di/dt square wave - layout critical for EMI and efficiency |
| BOOST (Pin 20) | Bootstrap supply | Charged via internal diode from SW; sustains top MOSFET gate drive during high-duty-cycle operation |
| SGND (Pin 21) | Signal ground | Exposed thermal pad - must be soldered to PCB for thermal performance and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® compensation | Allows loop bandwidth and phase margin optimization across wide output capacitance ranges without external component changes |
| Adjustable Burst Mode® clamp | External voltage on SYNC/MODE pin sets minimum peak inductor current (0–3.5A), directly controlling output ripple and light-load efficiency trade-off |
| Synchronous rectification | Integrated 65mΩ/90mΩ MOSFETs eliminate Schottky losses and reduce thermal stress vs. external diode solutions |
| 99% max duty cycle with dropout recovery | Maintains regulation down to VIN ≈ VOUT + IOUT × 65mΩ by forcing periodic bottom-switch conduction to refresh BOOST |
| Overtemperature protection | Shuts down both switches at ~150°C junction temperature and auto-restarts below 115°C - prevents thermal runaway in enclosed designs |
Applications
| Processor Core Power | FPGA I/O Bank Supply |
|---|---|
Use Scenario: Providing tightly regulated 1.2V/2.5A to an ARM Cortex-A series processor core under dynamic load transients. IC Role / Device Role / Timing Role: Primary point-of-load regulator with fast transient response enabled by OPTI-LOOP® and low-ESR ceramic output capacitors. Use Value: Maintains core voltage within ±1% during 1A/μs load steps, preventing timing violations and ensuring deterministic CPU operation. | Use Scenario: Delivering 3.3V/2.5A to Xilinx Artix-7 FPGA I/O banks requiring strict voltage tracking relative to core rail. IC Role / Device Role / Timing Role: Secondary regulated supply synchronized via TRACK/SS pin to follow core voltage ramp during power-up. Use Value: Prevents I/O latch-up by enforcing monotonic 3.3V rise after 1.2V core stabilization, eliminating need for external sequencer IC. |
| Battery-Powered Test Instrument | Server Backplane DC-DC Module |
Use Scenario: Powering a handheld oscilloscope's analog front-end and ADC with minimal standby drain. IC Role / Device Role / Timing Role: Main system regulator operating in Burst Mode® with externally clamped 0.6V SYNC/MODE voltage. Use Value: Achieves 75μA quiescent current and <15mVpp output ripple at 10mA load, extending Li-ion battery runtime by >30% vs. forced-continuous alternatives. | Use Scenario: Generating 5V/2.5A from a 12V backplane for PCIe add-in cards in telecom servers. IC Role / Device Role / Timing Role: High-efficiency intermediate converter synchronized to system clock to avoid beat frequencies. Use Value: Reduces conducted EMI by aligning switching edges with master clock, easing compliance with EN55022 Class B limits. |
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 |
|---|---|---|---|
| TPS54228DDA | Fixed 500kHz frequency, no external frequency sync; 3.5A rating; 4.5V–18V input | Higher input range suits 12V systems; lacks adjustable burst clamp and TRACK/SS functionality | Choose when input exceeds 10V or when fixed-frequency simplicity outweighs fine-grained light-load control |
| MP2315GJ-Z | 3.2A rating, 4.5V–28V input, integrated compensation; no PGOOD or SYNC pin | Broader input range and higher current, but no power-good signaling or external clock sync capability | Prefer for cost-sensitive industrial 24V applications where sequencing and EMI coordination are secondary |
Compared with TPS54228DDA and MP2315GJ-Z, the LTC3602IUF#PBF offers superior light-load efficiency control via programmable burst clamp, precise voltage tracking for multi-rail sequencing, and robust PGOOD monitoring - making it optimal for battery-constrained and high-reliability embedded systems.
Availability
LTC3602IUF#PBF is available at Aetrix Electronics and suitable for point-of-load supplies, portable instruments, and server backplane power requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3602IUF#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3602IUF#PBF belongs to Linear's high-efficiency monolithic DC/DC regulator product line, designed specifically for demanding point-of-load applications where precision regulation, low quiescent current, and robust thermal performance are critical.
FAQ
What is the maximum junction temperature specification for the LTC3602IUF#PBF?
The LTC3602IUF#PBF has a maximum junction temperature of 125°C under normal operation, with overtemperature protection activating at approximately 150°C to disable both power switches. Thermal shutdown releases automatically when junction temperature falls below 115°C, allowing safe restart. The 20-pin QFN package features an exposed SGND pad (Pin 21) that must be soldered to the PCB for effective heat dissipation and to meet the specified θJA = 37°C/W.
How does the LTC3602IUF#PBF achieve 99% duty cycle operation in dropout conditions?
The LTC3602IUF#PBF achieves up to 99% duty cycle by forcing the bottom switch to conduct for ~85ns every 16 clock cycles, even when the top switch remains continuously on. This brief conduction replenishes charge on the BOOST capacitor, sustaining gate drive for the top MOSFET. As a result, the LTC3602IUF#PBF maintains regulation down to input voltages only slightly above the output voltage plus IOUT × 65mΩ, unlike conventional buck regulators limited to ~90% duty cycle.
Can the LTC3602IUF#PBF be used with ceramic output capacitors exclusively?
Yes, the LTC3602IUF#PBF is fully compatible with ceramic output capacitors, which are recommended for low ESR and high-frequency ripple suppression. Its OPTI-LOOP® compensation architecture stabilizes the control loop across a wide range of ceramic capacitance values and ESR. However, layout best practices must be followed: minimize trace inductance between SW, PGND, and COUT, and avoid placing large-value ceramics directly at the SW node without damping to prevent ringing-induced EMI.
What is the function of the TRACK/SS pin on the LTC3602IUF#PBF, and how is it configured for voltage tracking?
The TRACK/SS pin on the LTC3602IUF#PBF serves dual functions: voltage tracking and external soft-start. For tracking, apply a ramp voltage (e.g., from another regulator's output via resistor divider) to TRACK/SS; the LTC3602IUF#PBF output will follow this ramp until it reaches 0.6V, then regulate to its internal reference. This ensures proper power-up sequencing between core and I/O rails. For soft-start, connect a capacitor from TRACK/SS to ground - the internal 1.25μA current source creates a linear ramp, delaying output rise time proportionally to capacitance value.
Does the LTC3602IUF#PBF require an external Schottky diode for operation?
No, the LTC3602IUF#PBF does not require an external Schottky diode. It integrates synchronous N-channel MOSFETs with 65mΩ (top) and 90mΩ (bottom) on-resistance, enabling full synchronous rectification. This eliminates reverse recovery losses and forward voltage drop associated with discrete diodes, improving efficiency by 5–10% at medium-to-heavy loads and reducing thermal design complexity. The internal architecture inherently manages body diode conduction during dead-time, making external diodes unnecessary and potentially detrimental.
LTC3602IUF#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)
LTC3602IUF#PBF FAQ
1.How can I place an order for LTC3602IUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3602IUF#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 LTC3602IUF#PBF reliable?
The price and inventory of LTC3602IUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3602IUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3602IUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3602IUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3602IUF#PBF?
LTC3602IUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3602IUF#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 LTC3602IUF#PBF?
For technical support, including LTC3602IUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3602IUF#PBF requirements.
6.How does Aetrix verify that LTC3602IUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3602IUF#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 LTC3602IUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3602IUF#PBF?
All LTC3602IUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3602IUF#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 LTC3602IUF#PBF part is unused and in its original packaging.
Return procedure for LTC3602IUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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