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Analog Devices Inc. LTC3615HFE#TRPBF
- Part No.:
- LTC3615HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3615HFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,281
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Product details
Overview
LTC3615HFE#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, 3A synchronous step-down DC/DC converter in thermally enhanced 24-pin TSSOP package, operating from 2.25V to 5.5V input and delivering two independent 0.6V–VIN outputs with ±1% feedback accuracy and 100% duty cycle low-dropout capability. It supports 4MHz max switching frequency, selectable 0°/90°/180° inter-channel phase shift, and Burst Mode operation achieving 130µA quiescent current - ideal for Li-ion-powered portable computing and DDR memory termination.
For engineers reviewing the LTC3615HFE#TRPBF datasheet, LTC3615HFE#TRPBF pinout, LTC3615HFE#TRPBF application, or LTC3615HFE#TRPBF equivalent, key selection criteria include dual 3A output capability with programmable phase alignment, thermal grade up to 150°C junction, internal/external compensation flexibility, slew rate limiting via SRLIM pin, and support for active voltage positioning (AVP) in DDR mode.
Technical Context
The LTC3615HFE#TRPBF implements current-mode, constant-frequency control across two identical channels sharing clock and reference circuits for tight channel-to-channel matching. Each channel features integrated P-channel high-side and N-channel synchronous rectifier switches with 75mΩ/55mΩ on-resistance at 3.3V, enabling high efficiency without external diodes.
Phase shift between SW1 and SW2 is selected via PHASE pin voltage (0°/90°/180°), while MODE pin configures operating mode - Burst Mode (internal clamp), pulse-skipping, forced continuous, or external-clamp Burst Mode. TRACK/SS pins enable internal soft-start, external tracking, or reference input, and ITH pins support internal AVP or external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports single-cell Li-ion battery operation with headroom for voltage sag. |
| Output Current per Channel | 3A continuous - enables dual 3A PoL or combined 6A single-output configurations with phase interleaving. |
| Feedback Accuracy | ±1% over –40°C to 150°C - ensures stable regulation under extended industrial temperature conditions. |
| Quiescent Current (Burst Mode) | 130µA - extends battery runtime in always-on portable systems with light-load efficiency optimization. |
| Switching Frequency Range | 400kHz to 4MHz - allows use of ultra-small inductors (e.g., 0.47µH) and minimizes EMI through external synchronization. |
| Shutdown Current | ≤1µA - enables true system-level power gating for zero-power standby states. |
| Phase Shift Options | 0°, 90°, or 180° - reduces input capacitor RMS current and output voltage ripple in multi-phase configurations. |
Pinout & Package
Package: 24-lead plastic eTSSOP (FE), 4mm × 6.5mm body, exposed PGND pad (Pin 25) requiring PCB soldering for thermal and electrical performance. θJA = 33°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| PHASE (1) | Phase shift selection | Voltage level sets 0° (SGND), 90° (½SVIN), or 180° (SVIN) inter-channel timing for ripple reduction. |
| VFB1/VFB2 (2,5) | Feedback input | Monitors output voltage via resistor divider; internal 0.6V reference enables down to 0.6V output regulation. |
| ITH1/ITH2 (3,6) | Error amplifier compensation | Connects to SGND for external compensation or SVIN to enable internal AVP mode for DDR applications. |
| RUN1/RUN2 (11,10) | Channel enable | Logic-high (>1V) enables respective channel; both low disables entire device with ≤1µA shutdown current. |
| RT/SYNC (12) | Oscillator control | Resistor-to-ground sets frequency (400kHz–4MHz); external clock synchronizes switching up to 4MHz. |
| SRLIM (14) | Slew rate control / DDR mode | Tied to SVIN enables DDR sink-current capability and adjusts switch edge rates to reduce EMI. |
| PGOOD1/PGOOD2 (15,13) | Power good indicator | Open-drain output asserts low if VFB deviates >±7.5% or RUNx is inactive - used for sequencing and fault reporting. |
| PGND (25) | Power ground | Exposed thermal pad; must be soldered to PCB plane for thermal dissipation and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3A synchronous buck architecture | Eliminates external catch diodes, improves efficiency up to 94%, and reduces board area vs discrete solutions. |
| 100% duty cycle operation | Enables ultra-low dropout regulation - critical for maintaining output during battery voltage decay in portable systems. |
| Programmable slew rate limiting | Reduces EMI emissions by controlling SW1/SW2 edge rates without sacrificing transient response. |
| Active Voltage Positioning (AVP) | Internal compensation mode automatically adjusts output voltage based on load current - optimized for DDR memory termination. |
| Accurate start-up tracking | TRACK/SS pins allow coordinated ramp-up with other rails or external references - essential for FPGA and processor power sequencing. |
Applications
| Point-of-Load Regulation | DDR Memory Termination |
|---|---|
|
Use Scenario: Powering core logic and I/O rails in portable computers and embedded controllers where space and thermal constraints are strict. IC Role / Device Role / Timing Role: Dual-channel synchronous buck regulator providing tightly regulated 1.8V/2.5V outputs with phase interleaving to minimize input ripple. Use Value: 94% peak efficiency and 130µA Burst Mode IQ extend battery life; 150°C rated junction enables reliable operation in compact enclosures. |
Use Scenario: Supplying VTT termination voltage for DDR2/DDR3 memory subsystems requiring bidirectional current sourcing/sinking. IC Role / Device Role / Timing Role: Configured in AVP mode with SRLIM = SVIN to deliver ±1.5A sink/source capability and dynamic voltage adjustment. Use Value: Eliminates need for external op-amps and discrete FETs; internal DDR mode ensures precise VTT tracking and fast transient response. |
| Portable Computer Systems | Handheld Devices |
|
Use Scenario: Main system power supply in ultrabooks and tablets with dual-core processors and multiple voltage domains. IC Role / Device Role / Timing Role: Primary dual-output regulator generating CPU core (1.2V) and SoC I/O (1.8V) rails with independent enable and soft-start control. Use Value: Independent RUNx pins enable flexible power sequencing; TRACK/SS1/SS2 support synchronized startup with PMIC or battery gauge ICs. |
Use Scenario: Compact, battery-powered medical monitors and handheld test equipment requiring long runtime and robust thermal performance. IC Role / Device Role / Timing Role: High-efficiency dual buck supplying display backlight driver and microcontroller rails from single Li-ion cell. Use Value: 2.25V minimum input supports full battery discharge range; 150°C H-grade qualification ensures reliability in sealed, fanless enclosures. |
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 |
|---|---|---|---|
| TPS543320RTVR | Single-channel 3A buck with integrated MOSFETs; no dual-output or phase-shift capability; 4.5V–18V input range. | Requires two devices for dual-rail designs; unsuitable for sub-4.5V Li-ion inputs or DDR sink-current requirements. | Select only when higher input voltage and single-rail simplicity outweigh dual-channel integration needs. |
| MP2451DT-LF-Z | Single-channel 0.6A buck; fixed 2MHz frequency; no programmable mode, phase shift, or AVP; SOT-23-6 package. | Limited to low-power peripherals; lacks thermal rating beyond 125°C and cannot support DDR or high-current PoL loads. | Consider only for cost-sensitive, low-current auxiliary rails - not a functional substitute for LTC3615HFE#TRPBF's dual 3A capability. |
Compared with TPS543320RTVR and MP2451DT-LF-Z, the LTC3615HFE#TRPBF uniquely delivers dual 3A outputs with 0°/90°/180° phase alignment, 150°C operation, and DDR-specific features like AVP and sink-current support - making it irreplaceable for high-density, thermally constrained, multi-rail portable power designs.
Availability
LTC3615HFE#TRPBF is available at Aetrix Electronics and suitable for portable computer systems, DDR memory termination, and handheld devices requiring stable component supply with extended temperature reliability and long-term production continuity.
Supply support for LTC3615HFE#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 precision analog and power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3615HFE#TRPBF belongs to Linear's high-efficiency monolithic DC/DC converter family, designed specifically for space-constrained, battery-operated systems demanding dual-rail regulation, low IQ, and extended temperature operation.
FAQ
What is the maximum junction temperature specification for the LTC3615HFE#TRPBF?
The LTC3615HFE#TRPBF is guaranteed to meet all specifications over a junction temperature range of –40°C to 150°C. This H-grade qualification distinguishes it from E- and I-grade variants and ensures reliable operation in thermally demanding environments such as sealed handheld enclosures or high-power-density portable computing systems where ambient temperatures exceed 85°C.
How does the PHASE pin configure inter-channel timing in the LTC3615HFE#TRPBF?
The PHASE pin on the LTC3615HFE#TRPBF selects output phase relationship between SW1 and SW2: tying to SGND yields 0°, applying ~½SVIN yields 90°, and connecting to SVIN yields 180°. This configuration directly reduces input capacitor RMS current and output voltage ripple - especially valuable in dual 3A or single 6A interleaved configurations where minimizing EMI and thermal stress is critical.
Can the LTC3615HFE#TRPBF support DDR memory termination with sink current capability?
Yes - the LTC3615HFE#TRPBF supports DDR termination when configured in Active Voltage Positioning (AVP) mode by tying ITH1/ITH2 to SVIN and setting SRLIM = SVIN. This enables ±1.5A bidirectional current delivery required for DDR2/DDR3 VTT rails, eliminating external components while maintaining tight regulation and fast transient response during read/write transitions.
What are the supported operating modes controlled by the MODE pin on the LTC3615HFE#TRPBF?
The MODE pin on the LTC3615HFE#TRPBF selects four distinct operating modes: Burst Mode (MODE = SGND), pulse-skipping (MODE = SVIN), forced continuous (MODE = 1.1V to 0.58×SVIN), or external-clamp Burst Mode (MODE = 0.5V–0.8V). Each mode balances light-load efficiency, output ripple, and transient response - allowing designers to optimize for battery life, noise sensitivity, or DDR compliance without hardware changes.
Is the LTC3615HFE#TRPBF pin-compatible with the LTC3615-1 variant?
No - the LTC3615HFE#TRPBF is based on the LTC3615 (not LTC3615-1) and supports 0°/90°/180° phase shift, whereas LTC3615-1 supports only 140°/180°. While both share identical pinouts and package footprints, the PHASE pin behavior differs, and firmware or layout adjustments are required to migrate between them. Always verify phase configuration requirements before substitution.
LTC3615HFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width) 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-TSSOP
LTC3615HFE#TRPBF FAQ
1.How can I place an order for LTC3615HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3615HFE#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 LTC3615HFE#TRPBF reliable?
The price and inventory of LTC3615HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3615HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3615HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3615HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3615HFE#TRPBF?
LTC3615HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3615HFE#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 LTC3615HFE#TRPBF?
For technical support, including LTC3615HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3615HFE#TRPBF requirements.
6.How does Aetrix verify that LTC3615HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3615HFE#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 LTC3615HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3615HFE#TRPBF?
All LTC3615HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3615HFE#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 LTC3615HFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3615HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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