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Analog Devices Inc. LTC3604IUD#PBF
- Part No.:
- LTC3604IUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3604IUD#PBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:777
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Product details
Overview
LTC3604IUD#PBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator delivering up to 2.5A output current with 3.6V–15V input range, 0.6V reference voltage, and programmable 800kHz–4MHz switching frequency in a thermally enhanced 16-pin 3mm × 3mm QFN package. It serves as a high-efficiency point-of-load power supply for lithium-ion battery-powered instruments and distributed power systems.
For engineers reviewing the LTC3604IUD#PBF datasheet, LTC3604IUD#PBF pinout, LTC3604IUD#PBF application, or LTC3604IUD#PBF equivalent, key selection criteria include its controlled on-time current-mode architecture, Burst Mode® operation (300µA no-load IQ), external frequency synchronization capability, and integrated power-good status output with ±8% trip threshold.
Technical Context
The LTC3604IUD#PBF employs a phase-lockable controlled on-time, current-mode architecture that maintains constant switching frequency while enabling very low duty-cycle operation (5% at 2.25MHz). Its internal error amplifier compares FB voltage against a precise 0.6V reference, adjusting ITH to regulate valley inductor current via PWM control of top and bottom MOSFETs.
It integrates dual MOSFET drivers with 130mΩ top and 100mΩ bottom switch RDS(ON), supports external RT resistor programming and MODE/SYNC clock synchronization, and features built-in short-circuit foldback protection (ILIM = 2.6A–4.3A), VIN overvoltage lockout (16.5V–17.5V), and soft-start via TRACK/SS pin with 400–700µs internal ramp time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 15V - supports wide-input industrial and battery-powered systems without pre-regulation |
| Max Output Current | 2.5A - sufficient for FPGA core rails, DSP supplies, and multi-rail embedded processors |
| Switching Frequency | 800kHz to 4MHz - enables compact magnetics and noise-sensitive high-frequency layout |
| Efficiency | Up to 95% - minimizes thermal load in space-constrained PCBs |
| No-Load Quiescent Current | 300µA in Burst Mode® - extends battery life in always-on portable instrumentation |
| Reference Voltage | 0.600V ±6mV - enables precise low-voltage outputs (e.g., 0.8V, 1.2V) with standard resistor dividers |
| Power Good Threshold | ±8% FB deviation - provides reliable system-level power sequencing and fault detection |
Pinout & Package
The LTC3604IUD#PBF is housed in a 16-pin, 3mm × 3mm plastic QFN package with exposed PGND pad (Pin 17) requiring soldering to PCB for thermal and electrical integrity. θJA = 45°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE/SYNC (1) | Mode control & sync input | Selects Burst Mode® (floating/INTVCC) or forced continuous (ground); accepts external clock for phase alignment |
| PGOOD (2) | Open-drain status output | Pulled low when FB deviates >±8% from 0.6V; high-impedance when within ±5% - used for power sequencing |
| SW (3,4) | Switch node | Connects to inductor; swings from PGND to VIN - critical for EMI layout and gate drive loop minimization |
| BOOST (6) | Floating gate drive supply | Connects to bootstrap capacitor (+) terminal; enables high-side MOSFET drive above VIN |
| INTVCC (7) | Internal 3.3V LDO output | Must be decoupled with ≥1µF ceramic cap to PGND - powers internal circuitry and can source limited external loads |
| VON (8) | On-time voltage input | Sets comparator trip point; tied to VOUT to make on-time proportional to output voltage - improves transient response |
| SGND (9) | Signal ground reference | Low-noise return for FB divider, compensation network, and RT resistor - must be isolated from PGND at single-point |
| RT (10) | Oscillator frequency program | Resistor to SGND sets fSW; 160kΩ → ~2MHz; enables precise frequency tuning and EMI spread-spectrum design |
| FB (11) | Feedback input | Compares resistive divider output to 0.6V reference - determines regulated output voltage accuracy and stability |
| ITH (12) | Error amp output & compensation | Loop compensation node; connect RC network for stability - ties to INTVCC for default internal compensation |
| TRACK/SS (13) | Tracking & soft-start input | Overrides reference for voltage tracking; internal 1.4µA pull-up enables soft-start with external capacitor |
| RUN (14) | Enable input | Active-high enable: >1.25V starts regulation; <1.0V forces shutdown - prevents unintended startup |
| VIN (15,16) | Main power input | High-current input pins requiring ≥10µF low-ESR ceramic bypass to PGND - shared with PGND return path |
| PGND (17) | Power ground | Exposed pad - must be soldered to large copper pour for thermal dissipation and low-impedance return path |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces no-load IQ to 300µA while maintaining regulation - essential for battery longevity in standby mode |
| Controlled on-time architecture | Enables stable operation at ultra-low duty cycles (5% at 2.25MHz) - supports high step-down ratios like 12V→1.2V |
| External frequency synchronization | Allows alignment to system clock or spread-spectrum sources - critical for noise-sensitive ADC/DAC applications |
| Output voltage tracking | Enables coordinated power-up of multiple rails using single TRACK/SS signal - simplifies multi-voltage FPGA/CPU designs |
| Integrated short-circuit foldback | Limits ILIM to ~1.3A during output shorts - reduces thermal stress and protects upstream supply without external circuitry |
Applications
| Point-of-Load Power Supply | Distributed Power System |
|---|---|
Use Scenario: Regulating 12V intermediate bus down to 1.8V for FPGA core logic in telecom baseband cards. IC Role / Device Role / Timing Role: Primary synchronous buck controller delivering 2.5A with fast transient response and precise 0.6V reference tracking. Use Value: Achieves 92% efficiency at full load while maintaining <20mVP-P ripple in forced continuous mode - avoids need for secondary LDO post-regulation. | Use Scenario: Providing isolated 3.3V and 5V rails from a common 48V backplane in industrial PLC modules. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with external SYNC capability to align switching edges across multiple LTC3604IUD#PBF units. Use Value: Enables synchronized switching to minimize aggregate input ripple and simplify EMI filter design across distributed rails. |
| Lithium-Ion Battery-Powered Instrument | Portable Medical Sensor Node |
Use Scenario: Powering a handheld multimeter with dual 3.3V analog and 1.2V digital rails from a single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: Input-range-optimized buck converter operating down to 3.6V VIN with Burst Mode® for microamp-level sleep current. Use Value: Extends battery runtime by >30% versus continuous-mode alternatives due to 300µA quiescent current at light loads. | Use Scenario: Supplying ultra-low-noise 2.5V bias to precision biosensor amplifiers in wearable ECG patches. IC Role / Device Role / Timing Role: Low-ripple, low-EMI power source with TRACK/SS-enabled soft-start to prevent sensor rail overshoot during wake-up. Use Value: Delivers <15mVP-P ripple in forced continuous mode and eliminates startup transients that could saturate front-end op-amps. |
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 1.2MHz fSW, no external sync, 3A rating, 4.5–26V input | Lacks TRACK/SS, PGOOD, and adjustable frequency - less flexible for sequencing or noise-sensitive designs | Choose for cost-sensitive, fixed-frequency applications where 2.5A margin and advanced features are unnecessary |
| TPS54202DRCT | 2A max output, 4.5–17V input, integrated compensation, 500kHz–2.5MHz adjustable fSW | No Burst Mode®, higher 26µA no-load IQ, lacks VON-based adaptive on-time - lower light-load efficiency | Prefer when board space is constrained and 2A output suffices, but avoid where battery life or ultra-low ripple is critical |
Compared with MP2315DJ-LF-Z and TPS54202DRCT, the LTC3604IUD#PBF offers superior light-load efficiency via Burst Mode®, precise 0.6V reference for low-output voltages, and full feature set (PGOOD, TRACK/SS, SYNC) for complex power architectures - justifying its use in high-performance portable and industrial systems.
Availability
LTC3604IUD#PBF is available at Aetrix Electronics and suitable for point-of-load power supplies, lithium-ion battery-powered instruments, and distributed power systems requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LTC3604IUD#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 LTC3604IUD#PBF belongs to Linear's monolithic DC/DC regulator product line, engineered for high-efficiency, high-density point-of-load conversion in space- and thermal-constrained applications demanding precision regulation and robust protection.
FAQ
What is the maximum input voltage rating for the LTC3604IUD#PBF?
The LTC3604IUD#PBF has an absolute maximum VIN rating of 16V, with overvoltage lockout activating at 16.5V (falling) and 17.5V (rising). Operation is suspended above 17.5V to protect internal MOSFETs, and resumes automatically once VIN drops below 16.5V. This ensures reliability in systems subject to automotive load-dump or industrial supply transients. The LTC3604IUD#PBF is not rated for sustained operation beyond 15V per its specified input range.
Does the LTC3604IUD#PBF support output voltage tracking, and how is it implemented?
Yes, the LTC3604IUD#PBF supports output voltage tracking via the TRACK/SS pin. When a voltage below 0.6V is applied to this pin, the regulator servo-controls the FB pin to match that voltage, enabling coordinated startup of multiple rails. An internal 1.4µA pull-up current from INTVCC allows soft-start by connecting an external capacitor from TRACK/SS to ground. This functionality is confirmed in the Pin Functions section and Typical Performance Characteristics (Figure G17). The LTC3604IUD#PBF implements tracking without requiring external op-amps or discrete components.
What are the thermal requirements for the LTC3604IUD#PBF in its QFN package?
The LTC3604IUD#PBF in the 16-pin 3mm × 3mm QFN package has a junction-to-ambient thermal resistance (θJA) of 45°C/W under standard JEDEC conditions. Its exposed PGND pad (Pin 17) must be soldered to a minimum 250mm² copper pour for effective heat dissipation. Maximum junction temperature is 125°C; ambient temperature must be derated based on power dissipation using TJ = TA + (PD × 45). The LTC3604IUD#PBF includes overtemperature protection that temporarily suspends switching if TJ exceeds 125°C.
Can the LTC3604IUD#PBF operate with a 3.3V input supply?
No, the LTC3604IUD#PBF cannot operate with a 3.3V input supply. Its minimum specified input voltage is 3.6V, and attempting to power it below this threshold may result in unstable regulation or failure to start. The device incorporates undervoltage lockout on INTVCC (2.45V–2.9V) and requires sufficient headroom for internal LDO operation and gate drive. For 3.3V input applications, consider alternative regulators such as the LTC3630 or TPS62130, as the LTC3604IUD#PBF is designed for 3.6V–15V intermediate bus conversion.
How does the MODE/SYNC pin affect operational mode and synchronization behavior in the LTC3604IUD#PBF?
The MODE/SYNC pin on the LTC3604IUD#PBF serves dual functions: tying it to ground forces continuous conduction mode, floating or connecting it to INTVCC enables Burst Mode® operation, and applying an external clock signal synchronizes the internal oscillator via PLL. During synchronization, the LTC3604IUD#PBF defaults to forced continuous mode regardless of MODE pin state. This behavior is explicitly documented in the Pin Functions section and Functional Block Diagram. The LTC3604IUD#PBF thus provides deterministic mode selection and precise frequency alignment in noise-critical systems.
LTC3604IUD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-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):
- 3.6V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 14.52V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 2MHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC3604IUD#PBF FAQ
1.How can I place an order for LTC3604IUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3604IUD#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 LTC3604IUD#PBF reliable?
The price and inventory of LTC3604IUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3604IUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3604IUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3604IUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3604IUD#PBF?
LTC3604IUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3604IUD#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 LTC3604IUD#PBF?
For technical support, including LTC3604IUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3604IUD#PBF requirements.
6.How does Aetrix verify that LTC3604IUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3604IUD#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 LTC3604IUD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3604IUD#PBF?
All LTC3604IUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3604IUD#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 LTC3604IUD#PBF part is unused and in its original packaging.
Return procedure for LTC3604IUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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