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Analog Devices Inc. LTC3610EWP#PBF
- Part No.:
- LTC3610EWP#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 64-PowerVFQFN
- Datasheet:
-
LTC3610EWP#PBF.pdf
- Description:
- IC REG BUCK ADJ 12A 64QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,041
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Product details
Overview
LTC3610EWP#PBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC converter delivering up to 12A output current from a 4V–24V input, regulating 2.5V output with ±1% reference accuracy, valley current mode control, and 9mm × 9mm 64-pin QFN package. It serves as a high-current point-of-load regulator in telecom power supplies and distributed power systems.
For engineers reviewing the LTC3610EWP#PBF datasheet, LTC3610EWP#PBF pinout, LTC3610EWP#PBF application, or LTC3610EWP#PBF equivalent, key selection criteria include adjustable current limit via VRNG pin, programmable soft-start using RUN/SS capacitor, forced continuous/discontinuous mode selection via FCB pin, and minimum on-time ≤100ns for high step-down ratio operation at low duty cycle.
Technical Context
The LTC3610EWP#PBF employs a constant on-time valley current mode architecture with internal N-channel MOSFETs (RDS(ON) = 12mΩ top / 6.5mΩ bottom), enabling stable ceramic-output-capacitor operation and fast transient response. Its switching frequency is set by external resistor RON on ION pin and modulated by VON pin voltage, supporting constant-frequency operation across input and output voltage variations.
Fault protection includes foldback current limiting, output overvoltage detection (±10% window), undervoltage lockout (3.4V–4.0V), and optional short-circuit shutdown timer. Power sequencing is managed via RUN/SS pin with 1.2µA soft-start charge current, while PGOOD provides open-drain output indicating regulation status.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 12A max continuous; supports high-density point-of-load conversion without external MOSFETs. |
| Input Voltage Range | 4V to 24V; accommodates 5V, 12V, and 24V industrial and telecom rails. |
| Output Voltage Accuracy | ±1% over temperature; enables precise regulation for FPGA, ASIC, and DSP core supplies. |
| Minimum On-Time | ≤100ns; allows stable 2.5V output from 24V input at ~500kHz without dropout. |
| Switching Frequency Range | Adjustable 400kHz–650kHz via RON; balances efficiency vs. size for 0.47µH inductor designs. |
| Current Limit Range | Programmable 7A–19A via VRNG pin (0.5V–0.7V); enables safe derating for thermal margin. |
| Shutdown Quiescent Current | 15µA; minimizes standby power in always-on systems. |
Pinout & Package
Package: 64-lead (9mm × 9mm) plastic QFN with exposed thermal pad (WP grade). Pin layout optimized for high-current SW/PVIN/PGND routing and low-noise SGND separation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pins 1,2,3,56–65) | Power Ground | Low-impedance return path for high di/dt switch currents; must connect directly to CIN(–) and CVCC(–). |
| SW (Pins 4–11,26,55,66) | Switch Node | Drives inductor; connects to CB(–) and L1; requires tight layout to minimize EMI and ringing. |
| PVIN (Pins 12–25,67) | Main Input Supply | Distributes VIN to internal drivers; decoupled with ≥10µF ceramic + bulk capacitance. |
| VFB (Pin 43) | Feedback Input | Senses output via resistive divider; referenced to 0.6V internal bandgap; sensitive to noise. |
| ITH (Pin 38) | Error Amplifier Output | Controls valley current threshold; used for compensation network and current limit scaling. |
| VRNG (Pin 37) | Current Limit Range | Adjusts IVALLEY(MAX) from 7A to 19A; tied to INTVCC divider for precise ILIMIT setting. |
| RUN/SS (Pin 30) | Enable & Soft-Start | Shuts down device when <0.8V; soft-start time ≈3s/µF; controls startup current ramp. |
| PGOOD (Pin 36) | Power Good Monitor | Open-drain output active low when VOUT deviates >±10% from regulation point. |
Key Features
| Feature | Design Value |
|---|---|
| Valley Current Mode Control | Enables stable operation with ceramic output capacitors and eliminates subharmonic oscillation at high duty cycles. |
| Programmable Minimum On-Time | Configurable tON(MIN) ≤100ns via ION/VON pins supports 24V→2.5V conversion at 500kHz without pulse-skipping. |
| Forced Continuous/Discontinuous Mode | FCB pin selects between low-noise continuous conduction or high-efficiency discontinuous mode at light load. |
| Internal 5V Regulator (INTVCC) | Supplies gate drivers and logic; switchover to EXTVCC ≥4.7V improves efficiency in multi-rail systems. |
| True Current Limit Foldback | Reduces valley current to ~1/6 of max during short-circuit, limiting power dissipation and junction temperature rise. |
Applications
| Telecom Line Card Power | Industrial PLC CPU Core Supply |
|---|---|
Use Scenario: 24V backplane powering multiple 2.5V/10A FPGA cores on dense line cards. IC Role / Device Role / Timing Role: Primary step-down regulator with fast transient response to handle burst-mode logic loads. Use Value: 12A capability and ≤100ns tON(MIN) maintain regulation during 8A load steps with <100mV droop. | Use Scenario: 12V industrial bus supplying 2.5V/8A processor core in programmable logic controller. IC Role / Device Role / Timing Role: High-reliability POL converter with overvoltage/overcurrent fault protection and thermal derating. Use Value: Programmable VRNG-based current limit ensures safe operation under partial short-circuit conditions. |
| Server Memory Module Regulator | Automotive ADAS Domain Controller |
Use Scenario: DDR4 memory subsystem requiring tightly regulated 2.5V with low ripple and fast load transient recovery. IC Role / Device Role / Timing Role: Point-of-load regulator with ceramic-capacitor stability and ±1% output accuracy. Use Value: Stable ceramic-COUT operation and 0.6V reference enable <±15mV output tolerance across temperature. | Use Scenario: 12V vehicle battery powering 2.5V/6A vision processor in autonomous driving ECU. IC Role / Device Role / Timing Role: Automotive-grade DC/DC with UVLO (3.4V), wide temp range (–40°C to 125°C), and robust fault handling. Use Value: Shutdown IQ = 15µA extends battery runtime in sleep mode; PGOOD enables system-level power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP8770GQ-Z (Monolithic Power) | 12A rating, 4.5V–18V input, fixed 500kHz fSW, no VRNG programmability, smaller 5mm × 6mm QFN. | Lacks adjustable current limit and wide VIN range; suited for cost-sensitive 12V-only systems. | Select MP8770GQ-Z only if input is strictly ≤18V and current limit adjustment is unnecessary. |
| TPS546D24RQFPR (Texas Instruments) | 15A rating, 4.5V–18V input, PMBus interface, integrated telemetry, 6mm × 6mm QFN. | Requires digital configuration; adds telemetry but increases BOM complexity and cost. | Choose TPS546D24RQFPR when digital monitoring, margining, or dynamic voltage scaling is required. |
Compared with MP8770GQ-Z and TPS546D24RQFPR, the LTC3610EWP#PBF offers wider 4V–24V input support, analog-programmable current limit via VRNG, and proven valley current mode stability with ceramic output capacitors-making it optimal for ruggedized 24V industrial and telecom applications where flexibility and analog control are prioritized over digital features or compact footprint.
Availability
LTC3610EWP#PBF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and server memory modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3610EWP#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 maintains its high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3610EWP#PBF belongs to the LTC® monolithic synchronous buck regulator family, designed specifically for high-current, high-step-down-ratio point-of-load applications demanding fast transient response, analog programmability, and robust fault protection in harsh environments.
FAQ
What is the maximum input voltage rating for the LTC3610EWP#PBF?
The LTC3610EWP#PBF has an absolute maximum input voltage rating of 28V on VIN and ION pins. Its operational input range is specified from 4V to 24V, with full performance guaranteed across this range. Exceeding 28V risks permanent damage per Absolute Maximum Ratings. The LTC3610EWP#PBF includes undervoltage lockout (UVLO) that disables operation below 3.4V and re-enables above 3.5V to prevent erratic startup.
How is the switching frequency set on the LTC3610EWP#PBF?
The LTC3610EWP#PBF switching frequency is set by an external resistor RON connected from VIN to the ION pin, combined with the voltage applied to the VON pin. The on-time tON follows tON = (10pF × VVON) / IION, where IION = VIN/RON. For example, with VON = 0V (clamped to 0.7V) and RON = 100kΩ at VIN = 12V, typical fSW ≈ 520kHz. The LTC3610EWP#PBF datasheet provides Figures 1a/1b for precise RON selection.
Can the LTC3610EWP#PBF operate with ceramic output capacitors?
Yes, the LTC3610EWP#PBF is explicitly designed for stable operation with ceramic output capacitors due to its valley current mode control architecture and internal compensation. The datasheet confirms stability with ≥10µF ceramic COUT and specifies ESR requirements for ripple and transient performance. No additional series resistance or tantalum/low-ESR polymer alternatives are required-ceramic capacitors simplify layout and improve reliability in the LTC3610EWP#PBF design.
What is the purpose of the VRNG pin on the LTC3610EWP#PBF?
The VRNG pin on the LTC3610EWP#PBF adjusts the maximum valley current limit, which directly sets the achievable output current. Applying 0.5V–0.7V to VRNG scales IVALLEY(MAX) from 7A to 19A, allowing precise current limit tuning for thermal derating or safety margins. When tied to ground, VRNG defaults to 0.7V (19A typical). Floating VRNG is prohibited. This analog programmability distinguishes the LTC3610EWP#PBF from fixed-limit competitors and enables flexible system-level protection.
Does the LTC3610EWP#PBF support power sequencing with other regulators?
Yes, the LTC3610EWP#PBF supports precise power sequencing via its RUN/SS pin and PGOOD output. Connecting a capacitor to RUN/SS sets soft-start time (~3s/µF), while PGOOD provides an open-drain signal indicating VOUT is within ±10% of regulation. These signals can drive enable inputs or microcontroller GPIOs to coordinate startup/shutdown order with other rails. The LTC3610EWP#PBF's independent timing and fault isolation make it ideal for multi-rail systems requiring controlled sequencing.
LTC3610EWP#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 64-PowerVFQFN
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 24V
- Current - Output:
- 12A
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-QFN (9x9)
LTC3610EWP#PBF FAQ
1.How can I place an order for LTC3610EWP#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3610EWP#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 LTC3610EWP#PBF reliable?
The price and inventory of LTC3610EWP#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3610EWP#PBF is usually 5 days.
3.What payment methods are accepted for LTC3610EWP#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3610EWP#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3610EWP#PBF?
LTC3610EWP#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3610EWP#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 LTC3610EWP#PBF?
For technical support, including LTC3610EWP#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3610EWP#PBF requirements.
6.How does Aetrix verify that LTC3610EWP#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3610EWP#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 LTC3610EWP#PBF meets industry standards.
7.What is the process for return or replacement of LTC3610EWP#PBF?
All LTC3610EWP#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3610EWP#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 LTC3610EWP#PBF part is unused and in its original packaging.
Return procedure for LTC3610EWP#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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