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Analog Devices Inc. LTC3633AIFE-2#TRPBF
- Part No.:
- LTC3633AIFE-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3633AIFE-2#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,332
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Product details
Overview
LTC3633AIFE-2#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel monolithic synchronous step-down regulator delivering 3A per channel across a 3.6V–20V input range. It features current-mode control, selectable 0°/180° phase shift between channels, and supports output voltages from 0.6V to 6V using its internal 0.6V reference-ideal for point-of-load power in industrial instrumentation and battery-powered systems with tight space constraints.
For engineers reviewing the LTC3633AIFE-2#TRPBF datasheet, LTC3633AIFE-2#TRPBF pinout, LTC3633AIFE-2#TRPBF application, or LTC3633AIFE-2#TRPBF equivalent, key selection criteria include its dual 3A output capability, 500kHz–4MHz programmable switching frequency, Burst Mode® vs forced continuous mode operation, and TSSOP-28 package compatibility with thermal design requirements at up to 125°C junction temperature.
Technical Context
The LTC3633AIFE-2#TRPBF uses a controlled on-time, current-mode architecture with an internal phase-locked loop that locks switching frequency to either an internal oscillator (set by RT resistor or INTVCC default) or external clock applied to MODE/SYNC. Its dual independent buck channels support out-of-phase operation via PHMODE to reduce input/output capacitor RMS current stress.
Each channel integrates high-side and low-side MOSFETs with 130mΩ/65mΩ RDS(ON), operates down to 5% duty cycle at 2.25MHz, and includes valley-current limiting (2.6A–4.5A), overvoltage lockout (22.5V PVIN trip), and thermal shutdown. Feedback regulation is referenced to a precision 0.6V bandgap with ±1% initial accuracy over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 20V - supports Li-ion stacks and standard 5V/12V rails without pre-regulation. |
| Output Current per Channel | 3A continuous - enables dual-rail POL supplies for FPGAs, DSPs, or multi-core processors. |
| Switching Frequency | 500kHz to 4MHz - adjustable via RT resistor; 2MHz default when RT tied to INTVCC. |
| Feedback Reference | 0.6V ±1% - allows precise low-voltage outputs (e.g., 0.6V–6V) with minimal divider error impact. |
| Efficiency | Up to 95% - achieved at mid-load with optimized inductor/capacitor selection and synchronous rectification. |
| Phase Shift Control | Selectable 0° or 180° - reduces input ripple current and eases input capacitor sizing when channels are interleaved. |
| Protection Features | Short-circuit, overtemperature, PVIN overvoltage (22.5V), and PGOOD status - ensures robust operation in unregulated environments. |
Pinout & Package
Package: 28-Lead Plastic TSSOP (FE package), 4mm × 5mm footprint, exposed PGND pad for thermal and electrical performance. Operating junction temperature range: –40°C to +125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1 / ITH2 | Error amplifier output & compensation node | Connect external RC network to set loop bandwidth; tie to INTVCC for internal compensation. |
| VFB1 / VFB2 | Feedback input (0.6V reference) | Resistor divider from VOUT sets regulated output voltage; ±30nA input bias minimizes divider error. |
| RUN1 / RUN2 | Channel enable inputs | Logic-high (>1.22V) enables channel; <1.01V disables with <3µA leakage - supports sequencing control. |
| PGOOD1 / PGOOD2 | Open-drain power-good indicators | Pulled low if VFB deviates >±8%; releases after return within ±5% - provides reliable rail monitoring with 40µs glitch filter. |
| PHMODE | Phase select input | Tie to GND for in-phase, INTVCC for 180° out-of-phase operation - reduces input capacitor RMS current by ~30%. |
| MODE/SYNC | Mode select & external sync input | Ground = forced continuous; float/INTVCC = Burst Mode®; driven clock = sync + forced continuous - enables system-level timing coordination. |
| TRACKSS1 / TRACKSS2 | Tracking/soft-start input | Apply voltage <0.6V to track another rail; internal 1.4µA pull-up enables soft-start with external capacitor - prevents inrush during power-up. |
| SW1 / SW2 | Switch node terminals | High dv/dt nodes connecting to external inductors; require low-inductance layout and Kelvin grounding to PGND. |
| PVIN1 / PVIN2 | Power input for each channel | Independent 3.6V–20V inputs - allows asymmetric supply configurations (e.g., one channel from battery, one from DC/DC). |
| BOOST1 / BOOST2 | Floating gate drive supplies | Bootstrap connections for high-side MOSFET drivers - require 0.1µF ceramic caps from BOOST to SW. |
| INTVCC | Internal 3.3V LDO output | Powers control circuitry; requires ≥1µF low-ESR ceramic decoupling to PGND - disabled when both RUN pins are low. |
| PGND | Power ground (exposed pad) | Mandatory solder connection to PCB ground plane - provides primary thermal path and low-impedance return for high-current paths. |
Key Features
| Feature | Design Value |
|---|---|
| Controlled on-time current-mode architecture | Delivers fast transient response and stable operation across wide VIN/VOUT ratios without slope compensation. |
| Interleaved 180° phase shift | Reduces input ripple current amplitude by ~70%, enabling smaller bulk capacitors and lower EMI filtering cost. |
| Burst Mode® operation | Quiescent current drops to 500µA per channel at light load - extends battery life in standby modes. |
| Programmable soft-start & output tracking | Prevents inrush current and enables controlled power-up sequencing across multiple rails using single capacitor per channel. |
| Integrated MOSFETs with matched RDS(ON) | 130mΩ high-side / 65mΩ low-side switches minimize conduction loss and eliminate external driver complexity. |
Applications
| Industrial Instrumentation Power | Portable Test Equipment |
|---|---|
Use Scenario: Dual-rail power for mixed-signal data acquisition systems with analog front-ends and digital processing cores. IC Role / Device Role / Timing Role: Primary POL regulator delivering 3.3V/1.8V simultaneously from 12V input with tight cross-regulation and low noise. Use Value: Interleaved operation reduces input capacitance requirement by 40% versus single-channel solutions, saving board area and cost. | Use Scenario: Battery-powered handheld oscilloscopes requiring efficient 5V and 3.3V rails with long standby time. IC Role / Device Role / Timing Role: Dual-output buck converter managing main system power and FPGA core voltage with dynamic load handling. Use Value: Burst Mode® cuts no-load IQ to 500µA per channel, extending Li-ion battery runtime by >3× versus forced continuous mode. |
| FPGA Core & I/O Supply | Automated Test Equipment (ATE) |
Use Scenario: Powering Xilinx Artix-7 FPGA banks with separate 1.0V core and 3.3V I/O rails from a 12V backplane. IC Role / Device Role / Timing Role: High-current, low-noise dual buck providing tightly regulated, sequenced outputs with soft-start and tracking. Use Value: Independent RUN pins allow precise power-up sequencing; TRACKSS pins ensure safe ramp-up of I/O before core activation. | Use Scenario: Modular ATE slot cards needing isolated 2.5V and 1.2V supplies with high reliability and thermal margin. IC Role / Device Role / Timing Role: Dual-channel regulator operating at 1.7MHz to minimize inductor size while maintaining >92% efficiency at full load. Use Value: 125°C rated TSSOP package supports convection-cooled designs without heatsinks in dense card cages. |
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 |
|---|---|---|---|
| MP2491DD-LF-Z | Single-channel 3A buck; no phase shift, no TRACKSS, lower max VIN (17V); QFN-16 package. | Suitable only for single-rail needs; lacks dual-channel coordination features required for FPGA or dual-domain systems. | Select only when space-constrained single-output design suffices and 20V input headroom is not needed. |
| LTC3633AEUFD-2#TRPBF | Same electrical specs but in 4mm×5mm QFN-28 package with superior θJA (43°C/W vs 25°C/W) and exposed thermal pad. | Better thermal performance for high-ambient or high-power-density layouts; requires different PCB land pattern and reflow profile. | Choose for thermally demanding applications where TSSOP thermal resistance is marginal. |
Compared with MP2491DD-LF-Z, LTC3633AIFE-2#TRPBF delivers true dual-rail coordination and higher input voltage tolerance; compared with LTC3633AEUFD-2#TRPBF, it trades thermal performance for legacy TSSOP compatibility and easier hand-soldering.
Availability
LTC3633AIFE-2#TRPBF is available at Aetrix Electronics and suitable for industrial instrumentation, portable test equipment, and FPGA power management requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3633AIFE-2#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 full technical and manufacturing continuity for all Linear power products.
The LTC3633A series belongs to Linear's high-efficiency monolithic DC/DC regulator product line, designed specifically for space-constrained, high-reliability point-of-load applications demanding dual independent outputs, precise sequencing, and robust protection.
FAQ
What is the maximum input voltage rating for LTC3633AIFE-2#TRPBF?
The LTC3633AIFE-2#TRPBF has an absolute maximum PVIN rating of 20V, with overvoltage lockout triggering at 22.5V (rising) and releasing at 21.5V (falling). This protects internal MOSFETs during transients. Operation above 20V violates the recommended operating conditions and risks permanent damage. The specified 3.6V–20V input range ensures optimal efficiency and reliability across industrial and battery-powered use cases for the LTC3633AIFE-2#TRPBF.
Does LTC3633AIFE-2#TRPBF support output voltage tracking between channels?
Yes, the LTC3633AIFE-2#TRPBF supports output voltage tracking via dedicated TRACKSS1 and TRACKSS2 pins. Applying a voltage below 0.6V to either pin forces the corresponding channel's feedback loop to servo the VFB pin to that voltage, enabling precise rail-to-rail tracking during startup. An internal 1.4µA pull-up current allows soft-start implementation with a single capacitor per channel. This functionality is confirmed in the device's pin functions and applications information sections for the LTC3633AIFE-2#TRPBF.
What package type and thermal characteristics does LTC3633AIFE-2#TRPBF use?
The LTC3633AIFE-2#TRPBF uses a 28-Lead Plastic TSSOP (FE) package with an exposed PGND pad. Its thermal resistance is θJA = 25°C/W under standard JEDEC 2S2P test conditions. The exposed pad must be soldered to the PCB ground plane to achieve rated performance and thermal dissipation. This package offers legacy compatibility and ease of assembly compared to QFN variants, while maintaining full electrical and functional equivalence to other LTC3633A-2 family members including the LTC3633AIFE-2#TRPBF.
Can LTC3633AIFE-2#TRPBF operate with only one channel enabled?
Yes, the LTC3633AIFE-2#TRPBF supports independent channel enable/disable via RUN1 and RUN2 pins. Either channel can be disabled by pulling its RUN pin below 1.01V, reducing quiescent current to ≤13mA total (both channels active) or ≤500µA per active channel in Burst Mode®. When both RUN pins are low, INTVCC is disabled. This capability enables flexible power sequencing, dynamic rail shutdown, and partial-system operation - all verified in the Electrical Characteristics table and Operation section for the LTC3633AIFE-2#TRPBF.
What is the minimum on-time specification for LTC3633AIFE-2#TRPBF and why does it matter?
The LTC3633AIFE-2#TRPBF has a minimum on-time of 20ns (typical) at VON = 0.6V and PVIN = 4V. This enables high-frequency operation (up to 4MHz) and supports very low duty-cycle applications such as 1.0V output from 12V input (8.3% duty cycle), where insufficient minimum on-time would cause frequency foldback or regulation loss. The controlled on-time architecture maintains constant frequency even at light loads, ensuring predictable EMI behavior - a key design parameter confirmed in the Electrical Characteristics table for the LTC3633AIFE-2#TRPBF.
LTC3633AIFE-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-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):
- 3.6V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 3A
- Frequency - Switching:
- 500kHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LTC3633AIFE-2#TRPBF FAQ
1.How can I place an order for LTC3633AIFE-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3633AIFE-2#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 LTC3633AIFE-2#TRPBF reliable?
The price and inventory of LTC3633AIFE-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3633AIFE-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3633AIFE-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3633AIFE-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3633AIFE-2#TRPBF?
LTC3633AIFE-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3633AIFE-2#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 LTC3633AIFE-2#TRPBF?
For technical support, including LTC3633AIFE-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3633AIFE-2#TRPBF requirements.
6.How does Aetrix verify that LTC3633AIFE-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3633AIFE-2#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 LTC3633AIFE-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3633AIFE-2#TRPBF?
All LTC3633AIFE-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3633AIFE-2#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 LTC3633AIFE-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3633AIFE-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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