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Analog Devices Inc. LTC3602EFE#PBF
- Part No.:
- LTC3602EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3602EFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:332
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Product details
Overview
LTC3602EFE#PBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC converter delivering up to 2.5A output current with 65mΩ top and 90mΩ bottom MOSFETs, adjustable 0.6V–9.5V output, and 4.5V–10V input range. It supports programmable switching frequency (300kHz–3MHz), Burst Mode® operation for light-load efficiency, and features Power Good monitoring, OPTI-LOOP® compensation, and internal 5V LDO (INTVCC).
For engineers reviewing the LTC3602EFE#PBF datasheet, LTC3602EFE#PBF pinout, LTC3602EFE#PBF application, or LTC3602EFE#PBF equivalent, key selection considerations include its 16-lead exposed TSSOP package, 75μA quiescent current in Burst Mode, ±1% reference accuracy, 99% max duty cycle for high VIN-to-VOUT ratios, and configurable mode control via SYNC/MODE pin.
Technical Context
The LTC3602EFE#PBF employs constant-frequency current-mode control with internal slope compensation active above 30% duty cycle to prevent subharmonic oscillation. Its dual N-channel synchronous power stage enables high efficiency without external diodes, while the ITH pin serves as the error amplifier compensation node and burst comparator threshold monitor.
Operation modes are selected via the SYNC/MODE pin: forced continuous conduction (tied to INTVCC), Burst Mode® (0.42V–1V), or pulse-skipping (grounded). The device integrates overtemperature shutdown (~150°C), short-circuit protection (4.5A valley current limit), and dropout operation sustaining >99% effective duty cycle using periodic BOOST capacitor refresh.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 10V - supports wide industrial and battery-derived supplies including 5V, 7.2V, 8.4V rails. |
| Output Current | Up to 2.5A - sufficient for point-of-load regulation of FPGAs, DSPs, and ASIC cores. |
| Switch RDS(ON) | 65mΩ (top), 90mΩ (bottom) - minimizes conduction loss and eliminates need for external Schottky diode. |
| Feedback Reference | 0.6V ±1% - enables precise low-voltage outputs (e.g., 0.9V, 1.2V, 1.8V) with tight regulation tolerance. |
| Quiescent Current | 75μA in Burst Mode - extends battery life in portable instruments and always-on subsystems. |
| Switching Frequency | 300kHz to 3MHz - selectable via RT resistor or external clock sync; balances size (inductor/capacitor) vs. efficiency. |
| Power Good Output | Open-drain, ±10% window - provides reliable system-level power sequencing and fault signaling. |
| Operating Temp | –40°C to +85°C - qualified for industrial and embedded environments without derating. |
Pinout & Package
Package: 16-lead plastic TSSOP with exposed pad (Pin 17 = SGND), θJA = 38°C/W, θJC = 10°C/W. Exposed pad must be soldered to PCB for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC/MODE (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 (2) | Power Good monitor | Open-drain output pulled low if VOUT deviates >±10% from regulation - used for system enable/disable sequencing. |
| RT (3) | Oscillator timing | Connects to ground via resistor to set switching frequency (300kHz–3MHz); sets internal ramp current for oscillator. |
| ITH (4) | Error amp compensation | Compensation node for loop stability; also monitored by burst comparator to trigger sleep mode when voltage drops below 330mV. |
| VFB (5) | Feedback input | Senses resistive divider output; regulates VOUT to 0.6V reference - enables adjustable output from 0.6V to 9.5V. |
| RUN (6) | Enable control | Active-high input; rising threshold 0.4V–1.0V - tie to PVIN for always-on operation or drive externally for controlled startup. |
| TRACK/SS (7) | Tracking/soft-start | Enables voltage tracking (e.g., core/I/O sequencing) or external soft-start via capacitor; internal 1ms ramp if left floating. |
| PGND (8,9,10) | Power ground | Low-impedance return path for high-current switch node paths - must be connected to large copper area under exposed pad. |
| SW (11,12,13) | Switch node | Connection to inductor; carries high di/dt pulsed current - requires short, low-inductance layout to minimize EMI and ringing. |
| BOOST (14) | Bootstrap supply | Provides gate drive voltage for top N-MOSFET; requires 0.1μF ceramic capacitor between BOOST and SW. |
| PVIN (15) | Main power input | 4.5V–10V input supply; decouple with ≥10μF low-ESR capacitor close to pin and PGND. |
| INTVCC (16) | Internal LDO output | 5.0V ±2% regulated supply for internal circuitry; powers RUN, VFB, TRACK/SS, and SYNC/MODE - can source 50mA. |
| SGND (17) | Signal ground | Reference for analog circuitry (error amp, references); must be tied to PGND at single point near IC or via exposed pad. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows external compensation network tuning to optimize transient response across wide load/output capacitor ranges - critical for dynamic FPGA/DSP loads. |
| Adjustable Burst Clamp | External control of minimum peak inductor current (0A–3.5A) via SYNC/MODE voltage - directly sets output ripple magnitude and burst frequency in light-load operation. |
| 99% Maximum Duty Cycle | Enables operation down to ~0.1V dropout (e.g., 5V→4.9V) by forcing periodic 85ns bottom-switch on-time to refresh BOOST capacitor - supports high-VIN-to-VOUT ratio applications. |
| Integrated 5V LDO (INTVCC) | Stable 5.0V ±2% supply with 50mA capability - powers internal logic and external bias circuits, eliminating need for separate LDO in compact designs. |
| Overtemperature Protection | Thermal shutdown at ~150°C junction temperature with automatic restart at ~115°C - protects against sustained overload or poor heatsinking without latch-up. |
| Short-Circuit Protection | Valley current limit of 4.5A prevents runaway during output short - forces skip-cycle operation until inductor current decays below threshold. |
Applications
| Point-of-Load Supplies | Portable Instruments |
|---|---|
Use Scenario: Regulating 3.3V/2.5A from a 7.2V Li-ion battery pack for an FPGA-based data acquisition module. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated core voltage with fast transient response to logic switching currents. Use Value: 95% peak efficiency at full load and 87% at 100mA (Burst Mode) extend runtime; 75μA quiescent current preserves battery charge during idle periods. | Use Scenario: Powering a handheld oscilloscope's analog front-end and microcontroller from a dual-cell 8.4V battery. IC Role / Device Role / Timing Role: Main DC/DC converter generating 5V for analog circuitry and 3.3V for digital logic, with independent soft-start sequencing. Use Value: TRACK/SS pin enables coordinated ramp-up of analog and digital rails to prevent latch-up; 16-lead TSSOP fits space-constrained handheld PCB layouts. |
| Server Backplane Power | Battery-Powered Devices |
Use Scenario: Delivering 1.2V/2.5A to a server CPU VRM auxiliary rail from a 10V backplane supply. IC Role / Device Role / Timing Role: Secondary buck stage providing precise low-voltage, high-current output with Power Good signaling for system management controller. Use Value: ±1% feedback reference ensures stable core voltage under varying load; PGOOD output triggers system reset if VOUT drifts beyond ±10%. | Use Scenario: Supplying 1.8V/2A to a Bluetooth SoC in a wireless sensor node powered by two AA cells (3.0V nominal). IC Role / Device Role / Timing Role: High-efficiency step-down regulator maintaining regulation down to 2.7V input while minimizing no-load power draw. Use Value: 99% max duty cycle sustains output as battery discharges to 2.7V; Burst Mode reduces standby current to 75μA, enabling multi-year battery life. |
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 | Fixed 3.3V output, 2A rating, 2.5V–6V input, no PGOOD or TRACK/SS pins | Limited to fixed-output, lower-current, simpler systems without sequencing or monitoring needs | Select only if fixed 3.3V output and <2A load suffice; lacks LTC3602EFE#PBF's adjustability, monitoring, and sequencing features. |
| TPS54227PW | 2.2A output, 4.5V–18V input, integrated BOOT diode, no adjustable burst clamp or OPTI-LOOP | Better for higher-input systems but offers less precise light-load ripple control and no external soft-start/tracking | Choose when input exceeds 10V or when BOOT diode integration simplifies layout; trade-off is reduced burst-mode flexibility and compensation tuning. |
Compared with MP2315DJ-LF-Z and TPS54227PW, the LTC3602EFE#PBF provides superior design flexibility through its adjustable output, precise burst clamp control, OPTI-LOOP compensation, and comprehensive sequencing features - making it optimal for demanding industrial and portable applications requiring reliability, efficiency, and configurability.
Availability
LTC3602EFE#PBF is available at Aetrix Electronics and suitable for point-of-load supplies, portable instruments, server backplane power, and battery-powered devices requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for LTC3602EFE#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 LTC3602 product line delivers high-efficiency monolithic synchronous buck regulators targeting industrial, communications, and portable equipment where precision regulation, low quiescent current, and flexible power sequencing are essential.
FAQ
What is the maximum output current capability of the LTC3602EFE#PBF?
The LTC3602EFE#PBF delivers up to 2.5A of continuous output current under typical conditions (TA = 25°C, proper thermal layout). Derating applies at elevated ambient temperatures or with limited PCB copper; the datasheet specifies 2.5A at 85°C ambient with recommended 2-layer board layout and exposed pad soldering. Peak inductor current limit is 4.5A, supporting transient surges without shutdown.
How does the LTC3602EFE#PBF achieve high efficiency at light loads?
The LTC3602EFE#PBF achieves high light-load efficiency via Burst Mode® operation, reducing quiescent current to 75μA. In this mode, the IC discontinuously switches - entering sleep state when average inductor current exceeds load demand - then wakes to replenish output capacitance. The burst clamp level (set by SYNC/MODE pin voltage) directly controls minimum peak inductor current and thus output ripple magnitude.
Can the LTC3602EFE#PBF be synchronized to an external clock?
Yes, the LTC3602EFE#PBF supports external clock synchronization via the SYNC/MODE pin. An external clock signal in the 300kHz–3MHz range can be applied directly to this pin, and the internal oscillator will lock to it. For reliable sync, the RT resistor should be selected for a free-running frequency ~25% lower than the target sync frequency.
What is the function of the TRACK/SS pin on the LTC3602EFE#PBF?
The TRACK/SS pin on the LTC3602EFE#PBF serves dual purposes: voltage tracking and external soft-start. When a ramp voltage is applied (e.g., from another regulator), VOUT tracks that ramp until it reaches 0.6V, then regulates to the internal reference. For soft-start, a capacitor from TRACK/SS to ground creates a controlled output ramp; leaving it floating enables the internal 1ms soft-start. Do not tie it to INTVCC or PVIN.
Does the LTC3602EFE#PBF include overtemperature protection?
Yes, the LTC3602EFE#PBF incorporates overtemperature protection that disables both power switches when junction temperature reaches approximately 150°C. The device remains latched off until temperature falls below ~115°C, at which point it automatically restarts. This feature protects against thermal runaway during sustained overload or inadequate heatsinking without requiring external circuitry.
LTC3602EFE#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
LTC3602EFE#PBF FAQ
1.How can I place an order for LTC3602EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3602EFE#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 LTC3602EFE#PBF reliable?
The price and inventory of LTC3602EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3602EFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3602EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3602EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3602EFE#PBF?
LTC3602EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3602EFE#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 LTC3602EFE#PBF?
For technical support, including LTC3602EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3602EFE#PBF requirements.
6.How does Aetrix verify that LTC3602EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3602EFE#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 LTC3602EFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3602EFE#PBF?
All LTC3602EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3602EFE#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 LTC3602EFE#PBF part is unused and in its original packaging.
Return procedure for LTC3602EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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