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Analog Devices Inc. LTC3615HUF#TRPBF
- Part No.:
- LTC3615HUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3615HUF#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,205
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Product details
Overview
LTC3615HUF#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, synchronous step-down DC/DC converter IC with 3A per channel output capability, operating up to 4MHz switching frequency and supporting 0°/90°/180° inter-channel phase shift. It features ±1% output voltage accuracy, 0.6V minimum output, and 100% duty cycle low-dropout operation - ideal for point-of-load regulation in battery-powered portable computers and DDR memory termination.
For engineers reviewing the LTC3615HUF#TRPBF datasheet, LTC3615HUF#TRPBF pinout, LTC3615HUF#TRPBF application, or LTC3615HUF#TRPBF equivalent, key selection criteria include dual 3A current capability, programmable slew rate limiting for EMI reduction, selectable Burst/Pulse-Skipping/Forced Continuous modes, internal or external compensation, and thermal grade support up to 150°C junction temperature.
Technical Context
The LTC3615HUF#TRPBF implements a current-mode, constant-frequency architecture with independent PVIN1/PVIN2 inputs and shared SVIN bias rail. Its dual channels share clock and reference circuits to ensure tight output matching, while phase-shift control (via PHASE pin) enables ripple cancellation in dual- or single-output configurations.
It integrates synchronous P-channel high-side and N-channel low-side MOSFETs (75mΩ/55mΩ typical RDS(ON)), eliminating external catch diodes. Operation supports three distinct light-load modes - Burst Mode (130µA IQ), Pulse-Skipping, and Forced Continuous - selected via the MODE pin voltage, with AVP and tracking capabilities enabled through ITH and TRACK/SS pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports single-cell Li-ion battery input without pre-regulation. |
| Output Current per Channel | 3A continuous - enables dual 3A PoL or combined 6A single-output designs. |
| Switching Frequency | Up to 4MHz - allows use of sub-1µH inductors and compact ceramic output capacitors. |
| Output Voltage Accuracy | ±1% over temperature - ensures stable core/memory rail regulation across industrial range. |
| Quiescent Current (Burst Mode) | 130µA - extends battery runtime in standby/sleep states of handheld devices. |
| Shutdown Current | ≤1µA - meets ultra-low-power system-level shutdown requirements. |
| Junction Temperature Range | –40°C to +150°C - qualified for high-reliability industrial and automotive under-hood applications. |
Pinout & Package
Package: 24-pin (4mm × 4mm) plastic QFN with exposed PGND pad (Pin 25), thermally enhanced for high-power density operation at up to 150°C TJ.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 / SW2 | Channel 1 / 2 switching node | Connects to external inductor; carries full switching current; requires low-inductance layout. |
| VFB1 / VFB2 | Feedback input for channel 1 / 2 | Monitors output voltage via resistive divider; sets regulated output with 0.6V internal reference. |
| ITH1 / ITH2 | Error amplifier compensation node | Accepts external RC network for loop stability; tied to SVIN enables AVP mode. |
| RUN1 / RUN2 | Enable input for channel 1 / 2 | Logic-high (>1V) enables respective channel; both low disables entire IC with ≤1µA draw. |
| PHASE | Inter-channel phase shift selector | 0°/90°/180° selection for ripple reduction - SGND = 0°, mid-SVIN = 90°, SVIN = 180° (LTC3615 variant). |
| SRLIM | Slew rate limit / DDR mode control | Resistor-to-SGND adjusts switch edge rate; tied to SVIN enables DDR sink-current mode (±1.5A). |
| RT/SYNC | Oscillator frequency control | Resistor sets fSW (400kHz–4MHz); external clock synchronizes switching; tied to SVIN = 2.25MHz default. |
| TRACK/SS1 / TRACK/SS2 | Soft-start / tracking input | Enables internal soft-start (tied to SVIN), external capacitor-based timing, or supply tracking. |
| PGOOD1 / PGOOD2 | Open-drain power-good indicator | Asserts low if output deviates >±7.5% or RUNx is inactive; requires external pull-up. |
| PVIN1 / PVIN2 | Independent power input for each channel | Supplies high-side PMOS gate drive; may be lower than SVIN but must exceed output voltage. |
| SVIN | Signal input supply | Powers internal logic and references; monitored for UVLO (2.25V threshold); must be ≥2.25V. |
| SGND | Signal ground reference | Reference for feedback, compensation, and control pins; must connect to PGND at single point. |
| PGND (Pin 25) | Power ground return | Exposed thermal pad; connects to sources of internal NMOS switches; mandatory PCB soldering for thermal and electrical performance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3A synchronous buck topology | Eliminates external diodes, reduces BOM count, improves efficiency up to 94% at full load. |
| Selectably phased dual outputs (0°/90°/180°) | Reduces input RMS current and output voltage ripple in dual- or parallel-output configurations. |
| Programmable slew rate limiting | Minimizes EMI emissions by controlling dV/dt on SW pins without sacrificing transient response. |
| Three light-load operating modes | Burst Mode (130µA IQ), Pulse-Skipping (lower ripple), and Forced Continuous (supports sinking current). |
| DDR memory termination support | SRLIM = SVIN enables ±1.5A bidirectional current sourcing/sinking for DDR2/3 VTT rails. |
| Internal or external compensation | ITH pin accepts RC network for custom loop tuning; tying to SVIN enables AVP for dynamic load line control. |
Applications
| Portable Computer Systems | DDR Memory Termination |
|---|---|
Use Scenario: Regulating core voltage (1.0–1.3V) and I/O voltage (1.8V) in ultrabooks and tablets powered by single Li-ion cells. IC Role / Device Role / Timing Role: Dual-channel PoL regulator delivering tightly matched 3A outputs with phase-shifted switching to minimize input capacitor stress. Use Value: Enables compact, high-efficiency power delivery with <130µA quiescent current during sleep states, extending battery life. | Use Scenario: Providing bidirectional ±1.5A termination for DDR3/DDR4 memory VTT rails requiring active sink capability. IC Role / Device Role / Timing Role: Synchronous buck configured in DDR mode via SRLIM = SVIN, supporting fast transient response and precise voltage positioning. Use Value: Eliminates need for discrete op-amp + MOSFET VTT solutions, reducing board area and component count. |
| Point-of-Load Supplies | Handheld Devices |
Use Scenario: Delivering clean, regulated 1.2V/1.8V/2.5V rails to FPGA, ASIC, or DSP cores in industrial embedded systems. IC Role / Device Role / Timing Role: High-density dual buck converter with 4MHz max switching frequency, enabling <1µH inductors and minimal footprint. Use Value: Achieves >90% efficiency across 10mA–3A load range while maintaining ±1% output accuracy over –40°C to +150°C. | Use Scenario: Powering application processors and display subsystems in smartphones and medical handhelds with strict thermal limits. IC Role / Device Role / Timing Role: Thermally robust QFN package with exposed PGND pad, rated for 150°C junction temperature and optimized for low-EMI layout. Use Value: Supports reliable operation in confined enclosures with no derating required up to 125°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS543320RHLR | Single-channel 3A output; supports PMBus interface; 4.5–18V input; no phase-shift capability. | Requires two units for dual 3A; lacks native DDR sink mode and 0.6V min output. | Choose when digital monitoring/control is required and input voltage exceeds 5.5V. |
| ISL8203MIRZ | 3A dual-channel with integrated inductors; fixed 500kHz–2MHz frequency; no programmable slew rate or DDR mode. | Higher solution size due to embedded inductors; limited flexibility in EMI optimization and light-load behavior. | Choose for rapid prototyping where board space is less constrained than EMI or thermal performance. |
Compared with TPS543320RHLR and ISL8203MIRZ, the LTC3615HUF#TRPBF offers unique integration of dual 3A channels with phase-shift control, DDR sink capability, and 130µA Burst Mode IQ - making it optimal for space-constrained, battery-sensitive, and high-transient applications demanding both efficiency and precision.
Availability
LTC3615HUF#TRPBF is available at Aetrix Electronics and suitable for portable computer systems, DDR memory termination, and point-of-load supplies requiring stable component supply with extended temperature reliability and long-term production continuity.
Supply support for LTC3615HUF#TRPBF 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 legacy of high-performance power management ICs with rigorous qualification and long-lifecycle support.
The LTC3615HUF#TRPBF belongs to Linear's high-efficiency monolithic DC/DC converter family, designed specifically for demanding point-of-load applications in portable, industrial, and computing systems where thermal resilience, low IQ, and multi-mode flexibility are critical.
FAQ
What is the maximum operating junction temperature for the LTC3615HUF#TRPBF?
The LTC3615HUF#TRPBF is specified for operation from –40°C to +150°C junction temperature. This H-grade qualification makes it suitable for high-ambient environments such as industrial controls or automotive cabin modules where standard commercial or industrial grades would require derating. The device includes thermal shutdown protection that activates above 150°C to prevent permanent damage.
Does the LTC3615HUF#TRPBF support DDR memory termination with sink current capability?
Yes, the LTC3615HUF#TRPBF supports DDR termination when the SRLIM pin is tied to SVIN, enabling ±1.5A bidirectional current sourcing and sinking for VTT rails. This mode is explicitly documented in the datasheet and leverages the internal synchronous switches - no external components are needed. The feature is available on all LTC3615 variants, including the H-grade LTC3615HUF#TRPBF.
How is phase shift configured between the two channels of the LTC3615HUF#TRPBF?
Phase shift on the LTC3615HUF#TRPBF is set using the PHASE pin: tie to SGND for 0°, to mid-SVIN (e.g., via resistor divider) for 90°, or to SVIN for 180°. This configuration applies only to the LTC3615 (not LTC3615-1), and the LTC3615HUF#TRPBF is the LTC3615 variant. The selection directly affects input current ripple and output voltage ripple in dual-output or paralleled configurations.
Can the LTC3615HUF#TRPBF operate with input voltage below 2.25V?
No, the LTC3615HUF#TRPBF has a guaranteed operating input voltage range of 2.25V to 5.5V. Below 2.25V, undervoltage lockout (UVLO) disables operation - the SVIN pin triggers at 2.25V (rising) and 1.7V (falling). Attempting to operate below this threshold risks erratic behavior or failure to regulate. For sub-2.25V inputs, consider alternative regulators such as the LTC3630 or LTC3642.
What are the key differences between Burst Mode, Pulse-Skipping, and Forced Continuous modes on the LTC3615HUF#TRPBF?
The LTC3615HUF#TRPBF offers three light-load modes selected via the MODE pin: Burst Mode (MODE = SGND) draws only 130µA but introduces higher output ripple; Pulse-Skipping (MODE = SVIN) maintains lower ripple than Burst Mode but increases IQ to ~200µA; Forced Continuous (MODE = 1.1V to 0.58×SVIN) sustains switching at all loads, enabling bidirectional current flow and lowest ripple - required for DDR sink operation. All modes are supported on the LTC3615HUF#TRPBF.
LTC3615HUF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 3A
- Frequency - Switching:
- 400kHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
LTC3615HUF#TRPBF FAQ
1.How can I place an order for LTC3615HUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3615HUF#TRPBF 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 LTC3615HUF#TRPBF reliable?
The price and inventory of LTC3615HUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3615HUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3615HUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3615HUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3615HUF#TRPBF?
LTC3615HUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3615HUF#TRPBF 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 LTC3615HUF#TRPBF?
For technical support, including LTC3615HUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3615HUF#TRPBF requirements.
6.How does Aetrix verify that LTC3615HUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3615HUF#TRPBF 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 LTC3615HUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3615HUF#TRPBF?
All LTC3615HUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3615HUF#TRPBF, 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 LTC3615HUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3615HUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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