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Analog Devices Inc. LTC3615EFE#TRPBF
- Part No.:
- LTC3615EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3615EFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,819
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Product details
Overview
LTC3615EFE#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 at up to 4MHz switching frequency. It features current-mode control, selectable 0°/90°/180° inter-channel phase shift, 2.25V–5.5V input range, and ±1% output voltage accuracy down to 0.6V - optimized for point-of-load regulation in portable computing and DDR memory termination.
For engineers reviewing the LTC3615EFE#TRPBF datasheet, LTC3615EFE#TRPBF pinout, LTC3615EFE#TRPBF application, or LTC3615EFE#TRPBF equivalent, key selection criteria include dual 3A output capability with programmable phase shift, low-noise Burst Mode operation (130µA IQ), 100% duty cycle dropout support, and compatibility with small 0.47µH inductors for space-constrained Li-ion-powered systems.
Technical Context
The LTC3615EFE#TRPBF implements a dual-channel, constant-frequency current-mode architecture with shared clock and reference circuits to ensure tight channel-to-channel matching. Each channel integrates matched P-channel high-side and N-channel synchronous rectifier MOSFETs with 75mΩ/55mΩ typical RDS(ON), enabling high efficiency (up to 94%) without external diodes.
Phase shift between SW1 and SW2 is selected via the PHASE pin (0°/90°/180°), reducing input ripple in dual-output mode or enabling single 6A output with interleaved operation. The MODE pin selects among Burst Mode (130µA IQ), Pulse-Skipping, or Forced Continuous Mode - the latter required for bidirectional current handling in DDR termination applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports single-cell Li-ion battery operation across full discharge curve. |
| Output Current per Channel | 3A continuous - enables dual independent point-of-load supplies or interleaved 6A output. |
| Switching Frequency | Up to 4MHz - allows use of compact 0.47µH inductors and reduces solution footprint. |
| Feedback Voltage Accuracy | ±1% over –40°C to 125°C - ensures stable regulation under thermal stress in embedded systems. |
| Quiescent Current (Burst Mode) | 130µA - extends battery life in always-on portable devices with light-load standby requirements. |
| Shutdown Current | ≤1µA - meets ultra-low-power system-level shutdown specifications. |
| Output Voltage Range | 0.6V to VIN - supports core voltages for modern SoCs and DDR memory interfaces. |
Pinout & Package
Package: 24-pin thermally enhanced plastic TSSOP (FE package), 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 (Pin 1) | Phase shift selection input | Configures 0° (SGND), 90° (SVIN/2), or 180° (SVIN) inter-channel timing - critical for input ripple reduction in dual-output designs. |
| VFB1/VFB2 (Pins 2,5) | Channel 1/2 feedback inputs | Monitor output voltage via external resistor divider; internal 0.6V reference enables precise regulation down to 0.6V. |
| SW1/SW2 (Pins 16–19, 8–9) | Channel 1/2 switching nodes | Connect to external inductors; integrate synchronous MOSFETs - eliminates catch diodes and improves efficiency. |
| RT/SYNC (Pin 12) | Oscillator frequency control | Supports resistor-programmed (400kHz–4MHz), external clock-synchronized, or internal 2.25MHz operation. |
| RUN1/RUN2 (Pins 11,10) | Channel enable inputs | Logic-level control (1V high threshold); tying both to GND shuts down entire device drawing ≤1µA. |
| PGOOD1/PGOOD2 (Pins 15,13) | Power-good open-drain outputs | Indicate ±7.5% output voltage window compliance - used for sequencing and fault monitoring in multi-rail systems. |
| PGND (Pin 25) | Power ground | Exposed thermal pad tied to sources of internal N-MOSFETs - must be soldered to PCB plane for thermal management and noise control. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3A synchronous buck channels | Enables compact dual-rail power delivery or interleaved 6A output with reduced input/output ripple. |
| Programmable inter-channel phase shift | 0°/90°/180° selection minimizes input capacitor RMS current and EMI in multi-phase configurations. |
| Burst Mode operation with 130µA IQ | Maintains regulation at light loads while maximizing battery runtime in portable electronics. |
| 100% duty cycle low-dropout operation | Extends usable battery life by sustaining output as input voltage falls near VOUT. |
| DDR memory termination mode | Enabled via SRLIM = SVIN; supports ±1.5A sink/source capability for DDR3/DDR4 VTT rails. |
| Adjustable slew rate limiting | Reduces EMI via external resistor on SRLIM pin - critical for meeting Class B emissions standards. |
Applications
| Portable Computer Systems | DDR Memory Termination |
|---|---|
|
Use Scenario: Powering CPU core, GPU, and I/O rails in ultrabooks and tablets with single-cell Li-ion battery input. IC Role / Device Role / Timing Role: Dual-channel step-down regulator delivering 1.8V/3A and 2.5V/3A simultaneously with interleaved switching. Use Value: 94% peak efficiency and 130µA Burst Mode IQ extend battery life; 4MHz operation enables <3mm² inductor area per channel. |
Use Scenario: Providing bidirectional ±1.5A termination current for DDR3/DDR4 memory VTT rail in laptops and servers. IC Role / Device Role / Timing Role: Sinking and sourcing current during memory read/write cycles using Forced Continuous Mode and AVP compensation. Use Value: Eliminates need for discrete termination resistors and external op-amps; integrated DDR mode reduces BOM count by ≥4 components. |
| Point-of-Load Supplies | Handheld Devices |
|
Use Scenario: Local regulation for FPGA, ASIC, or RF transceiver subsystems requiring clean, tightly regulated 0.8V–1.2V supplies. IC Role / Device Role / Timing Role: High-bandwidth current-mode controller with external compensation (ITH pins) for fast transient response to dynamic load steps. Use Value: <50µs load-step recovery time and <200mV undershoot at 3A step; supports 100kHz+ control loop bandwidth. |
Use Scenario: Compact power management in smartphones and wearables where board space and thermal dissipation are constrained. IC Role / Device Role / Timing Role: Dual-output converter in 4mm × 6.5mm TSSOP package with exposed PGND pad for efficient heat transfer to PCB. Use Value: 33°C/W thermal resistance enables 3A/channel operation at <70°C junction temperature in 1-layer thermal pad layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54383PWPR | Fixed 3.3V/1.8V dual outputs; no programmable phase shift; 2.5A per channel; 500kHz–2.2MHz frequency range. | Limited to fixed-voltage applications; lacks DDR termination mode and adjustable soft-start tracking. | Preferred for cost-sensitive, non-adjustable dual-rail systems where phase control and low-IQ Burst Mode are not required. |
| ISL9123IRAJZ-T7A | Single 3A buck with integrated LDO; 2.5V–5.5V input; 1.2µA shutdown current; no dual-channel or phase-shift capability. | Not functionally equivalent - serves single-rail applications only; no inter-channel synchronization. | Only suitable when replacing one channel of LTC3615EFE#TRPBF in simplified, lower-complexity designs. |
Compared with TPS54383PWPR and ISL9123IRAJZ-T7A, the LTC3615EFE#TRPBF uniquely delivers programmable dual-channel phase alignment, 130µA Burst Mode IQ, and DDR termination support - making it irreplaceable in high-efficiency, multi-phase, memory-intensive portable platforms.
Availability
LTC3615EFE#TRPBF is available at Aetrix Electronics and suitable for portable computer systems, DDR memory termination, and point-of-load supplies requiring stable component supply, long-term industrial availability, and RoHS-compliant packaging.
Supply support for LTC3615EFE#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. Linear Technology pioneered high-performance DC/DC regulators with industry-leading efficiency and integration.
The LTC3615EFE#TRPBF belongs to Linear's monolithic synchronous buck regulator family, designed specifically for high-density, battery-operated systems demanding dual-rail flexibility, ultra-low quiescent current, and robust transient response.
FAQ
What is the maximum supported switching frequency for the LTC3615EFE#TRPBF?
The LTC3615EFE#TRPBF supports an externally programmable switching frequency up to 4MHz via the RT/SYNC pin. This allows use of miniature 0.47µH inductors and significantly reduces solution size compared to lower-frequency alternatives. At 4MHz, the device maintains >90% efficiency at 2A load with 3.3V input and 1.8V output.
Does the LTC3615EFE#TRPBF support DDR memory termination?
Yes, the LTC3615EFE#TRPBF supports DDR memory termination mode when the SRLIM pin is tied to SVIN. In this configuration, it delivers ±1.5A sink/source capability with Active Voltage Positioning (AVP) compensation, meeting JEDEC specifications for DDR3 and DDR4 VTT rails without external components.
What package type and thermal characteristics does the LTC3615EFE#TRPBF use?
The LTC3615EFE#TRPBF uses a 24-pin thermally enhanced plastic TSSOP (FE package) with an exposed PGND pad (Pin 25). Its thermal resistance is θJA = 33°C/W when properly soldered to a 2-layer PCB with 1in² copper pour, enabling reliable 3A/channel operation at ambient temperatures up to 85°C.
How does the PHASE pin configure inter-channel timing on the LTC3615EFE#TRPBF?
The PHASE pin on the LTC3615EFE#TRPBF selects inter-channel phase shift: 0° when tied to SGND, 90° when biased at SVIN/2, and 180° when tied to SVIN. This programmability reduces input capacitor RMS current by up to 30% in dual-output mode and enables seamless migration to single 6A interleaved operation.
What are the key differences between Burst Mode, Pulse-Skipping, and Forced Continuous Mode on the LTC3615EFE#TRPBF?
The MODE pin selects operating mode: Burst Mode (MODE = SGND) achieves 130µA IQ but introduces output ripple; Pulse-Skipping (MODE = SVIN) maintains regulation with higher IQ (~220µA); Forced Continuous (MODE = 1.1V–0.58×SVIN) ensures zero ripple and bidirectional current capability - required for DDR termination in LTC3615EFE#TRPBF applications.
LTC3615EFE#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
LTC3615EFE#TRPBF FAQ
1.How can I place an order for LTC3615EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3615EFE#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 LTC3615EFE#TRPBF reliable?
The price and inventory of LTC3615EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3615EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3615EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3615EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3615EFE#TRPBF?
LTC3615EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3615EFE#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 LTC3615EFE#TRPBF?
For technical support, including LTC3615EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3615EFE#TRPBF requirements.
6.How does Aetrix verify that LTC3615EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3615EFE#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 LTC3615EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3615EFE#TRPBF?
All LTC3615EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3615EFE#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 LTC3615EFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3615EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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