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Analog Devices Inc. LTC3633AIFE-3#TRPBF
- Part No.:
- LTC3633AIFE-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3633AIFE-3#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,807
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Product details
Overview
LTC3633AIFE-3#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel monolithic synchronous step-down regulator delivering 3A per channel from 3.6V–20V input, featuring 0.6V reference, 500kHz–4MHz adjustable switching frequency, and 180° phase-shift capability for reduced input/output ripple. It serves as a high-efficiency point-of-load power supply in battery-powered instrumentation and distributed systems.
For engineers reviewing the LTC3633AIFE-3#TRPBF datasheet, LTC3633AIFE-3#TRPBF pinout, LTC3633AIFE-3#TRPBF application, or LTC3633AIFE-3#TRPBF equivalent, key selection criteria include its VON sense range (1.5V–12V), TSSOP-28 package with exposed PGND pad, Burst Mode® vs forced continuous operation, and dual-channel tracking/soft-start support.
Technical Context
The LTC3633AIFE-3#TRPBF implements a controlled on-time, current-mode architecture with internal phase-locked loop (PLL) synchronization to maintain constant frequency across load and line variations. Its two independent buck channels share no internal power coupling but support inter-channel phase alignment via PHMODE pin.
Each channel features separate PVIN inputs, dedicated ITH compensation pins, independent RUN enable controls, and individual PGOOD status outputs. The VON1/VON2 pins accept 1.5V–12V feedback references-distinct from the LTC3633A-2's 0.6V–6V range-enabling stable regulation at higher output voltages without external scaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 20V - supports single-cell Li-ion stacks and standard 12V/5V rails without pre-regulation. |
| Output Current per Channel | 3A continuous - sufficient for FPGA core, DSP, or multi-rail microcontroller subsystems. |
| Switching Frequency | 500kHz to 4MHz - programmable via RT resistor; enables compact magnetics and low-profile capacitors. |
| VON Sense Range | 1.5V to 12V - allows direct feedback from 1.8V, 3.3V, 5V, or 12V outputs without divider attenuation or error amplifier offset. |
| Reference Voltage | 0.6V ±1% - sets minimum output voltage; combined with VON range, defines usable output span. |
| Efficiency | Up to 95% - achieved at mid-load with optimized inductor and ceramic capacitor selection. |
| Phase Shift | Selectable 0° or 180° - reduces input capacitance requirement by interleaving channel currents. |
Pinout & Package
Package: 28-Lead Plastic TSSOP with exposed PGND pad (pin 29), rated for –40°C to 125°C junction temperature (θJA = 25°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1 / ITH2 | Error amplifier output & compensation node | Connect RC network to set loop bandwidth; tie to INTVCC for internal compensation. |
| VFB1 / VFB2 | Feedback input | Compares output voltage (via resistor divider) to 0.6V reference; determines regulation accuracy. |
| RUN1 / RUN2 | Channel enable | Logic-high (>1.22V) enables channel; <1.0V disables with shutdown current <13µA. |
| PGOOD1 / PGOOD2 | Open-drain power-good status | Pulled low if VFB deviates >±8%; releases at ±5% with 40µs filter to suppress transient glitches. |
| PHMODE | Phase select control | Ground = in-phase; INTVCC = 180° out-of-phase - reduces input ripple and EMI peak amplitude. |
| MODE/SYNC | Operation mode & sync input | Ground = forced continuous; float/INTVCC = Burst Mode®; driven clock = PLL-synchronized forced continuous. |
| TRACKSS1 / TRACKSS2 | Tracking/soft-start input | Apply voltage <0.6V to track external rail; capacitor to SGND enables controlled startup ramp. |
| SW1 / SW2 | Switch node | High-frequency node connecting to external inductor; swing from ~–0.3V to PVIN. |
| PVIN1 / PVIN2 | Power input per channel | Independent inputs allow dual-rail sourcing (e.g., 12V + 5V) or redundancy; each rated 1.5V–20V. |
| PGND | Power ground | Exposed pad (pin 29); must be soldered to PCB for thermal dissipation and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel 3A buck regulation | Enables compact dual-rail supplies (e.g., 3.3V + 1.8V) without discrete controllers or external MOSFETs. |
| 180° phase shift capability | Halves RMS input ripple current versus in-phase operation, reducing required CIN by up to 50%. |
| Burst Mode® operation | Reduces quiescent current to 500µA at light loads while maintaining ±5% regulation tolerance. |
| External frequency synchronization | Accepts external clock on MODE/SYNC pin to eliminate beat frequencies in multi-regulator systems. |
| Output voltage tracking & soft-start | Ensures orderly power-up sequencing between rails using single capacitor per channel on TRACKSS pins. |
| Comprehensive protection | Includes overvoltage lockout (22.5V trip), overtemperature shutdown, short-circuit limiting (3.5A typ), and PGOOD monitoring. |
Applications
| Industrial PLC I/O Modules | Portable Test Equipment |
|---|---|
Use Scenario: Powering isolated analog front-ends and digital logic in modular I/O cards with strict thermal and space constraints. IC Role / Device Role / Timing Role: Dual-channel buck regulator supplying 5V for isolation ICs and 3.3V for microcontrollers, with phase-shifted operation minimizing conducted EMI. Use Value: Eliminates need for two discrete regulators; 180° interleaving cuts input capacitor size by 40% versus single-channel solution. | Use Scenario: Battery-powered handheld oscilloscopes requiring clean, sequenced 1.8V, 3.3V, and 5V rails from a 2S Li-ion pack (6–8.4V). IC Role / Device Role / Timing Role: Primary point-of-load regulator managing three regulated outputs via tracking and independent enable controls. Use Value: Burst Mode® extends battery life by reducing standby current to sub-mA levels while maintaining fast wake-up response. |
| Medical Imaging Sensors | Automotive ADAS Camera Modules |
Use Scenario: Supplying low-noise bias voltage to CMOS image sensors and ADCs in portable ultrasound probes. IC Role / Device Role / Timing Role: Dual-channel regulator delivering 1.8V (sensor core) and 2.8V (ADC interface) with tight tracking during power-up. Use Value: Internal 0.6V reference and 1.5V–12V VON range enable precise 2.8V output without external op-amp scaling circuitry. | Use Scenario: Powering SoC, ISP, and image sensor in rear-view camera modules operating from 9–16V automotive battery. IC Role / Device Role / Timing Role: High-input-voltage buck converter generating 1.1V (SoC core) and 1.8V (memory interface) with UVLO and OVLO protection. Use Value: 20V absolute max input rating and 22.5V overvoltage lockout protect against load-dump transients without external TVS. |
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 |
|---|---|---|---|
| TPS544B20RMLR | Single-channel 4A output; requires two devices for dual-rail; uses external FETs; no integrated phase-shift control. | Suitable for higher-current single-rail needs but lacks native dual-channel integration and tracking. | Choose when >3A/channel is needed or when discrete FET optimization is required for thermal management. |
| LTC3633AEFE-3#TRPBF | Same electrical specs and pinout; differs only in package (QFN-28 vs TSSOP-28); identical thermal resistance spec (θJA = 43°C/W for QFN). | Preferred where board space is constrained and thermal performance demands lower θJA than TSSOP allows. | Select QFN variant when PCB real estate is limited or when higher power density justifies reflow-compatible packaging. |
Compared with TPS544B20RMLR, LTC3633AIFE-3#TRPBF integrates both channels, eliminates external MOSFET layout complexity, and provides built-in phase control-reducing BOM count by 6+ components. Versus LTC3633AEFE-3#TRPBF, the TSSOP version offers easier visual inspection and hand-soldering compatibility at the cost of slightly higher thermal resistance.
Availability
LTC3633AIFE-3#TRPBF is available at Aetrix Electronics and suitable for industrial PLC I/O modules, portable test equipment, medical imaging sensors, and automotive ADAS camera modules requiring stable component supply across extended temperature ranges.
Supply support for LTC3633AIFE-3#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 product support, documentation, and manufacturing continuity for all Linear-branded power management ICs.
The LTC3633A family targets high-density, high-efficiency dual-rail DC/DC conversion in space-constrained applications where input voltage ranges exceed 12V and output sequencing or phase control is critical.
FAQ
What is the VON sense range for LTC3633AIFE-3#TRPBF, and why does it matter?
The LTC3633AIFE-3#TRPBF has a VON sense range of 1.5V to 12V, distinguishing it from the LTC3633A-2 (0.6V–6V). This wider range allows direct connection of the VON pin to higher output voltages-such as 3.3V, 5V, or 12V-without external resistor dividers or level-shifting circuits. As a result, LTC3633AIFE-3#TRPBF maintains accurate on-time control and stable switching frequency across its full output voltage span, simplifying design and improving regulation fidelity for mid-to-high voltage rails.
Can LTC3633AIFE-3#TRPBF operate with different input voltages on each channel?
Yes, LTC3633AIFE-3#TRPBF supports independent PVIN1 and PVIN2 inputs, each rated from 1.5V to 20V. This allows one channel to be powered from a 5V auxiliary rail while the other draws from a 12V main supply-or even from separate battery cells. The device maintains full regulation, protection, and synchronization capability under split-input conditions, making LTC3633AIFE-3#TRPBF ideal for redundant power architectures or mixed-voltage system designs.
How does the 180° phase shift function in LTC3633AIFE-3#TRPBF reduce input capacitance requirements?
When LTC3633AIFE-3#TRPBF operates with 180° phase shift (PHMODE = INTVCC), the input current pulses from each channel alternate in time, effectively interleaving their charge demands. This reduces peak-to-peak input ripple current by up to 50% compared to in-phase operation, allowing designers to use smaller bulk input capacitors-typically cutting total CIN volume by 30–40%. The result is lower board area, reduced EMI, and improved reliability due to decreased capacitor stress.
What protection features are integrated into LTC3633AIFE-3#TRPBF?
LTC3633AIFE-3#TRPBF integrates input overvoltage lockout (22.5V trip), overtemperature shutdown, cycle-by-cycle current limiting (3.5A typical valley limit), short-circuit protection, and open-drain PGOOD outputs with ±8% fault threshold and 40µs glitch filtering. These protections operate independently per channel and require no external components-ensuring robust operation in harsh environments such as automotive or industrial settings without added design overhead.
Is LTC3633AIFE-3#TRPBF pin-compatible with other variants in the LTC3633A family?
No, LTC3633AIFE-3#TRPBF is not pin-compatible with LTC3633A-2 variants due to differing VON sense ranges and associated internal reference configurations. While the physical pinout and package (TSSOP-28) match across the LTC3633A-2 and LTC3633A-3 families, the functional behavior of VON1/VON2 pins-and thus the supported output voltage range-is fundamentally different. Substituting LTC3633AIFE-3#TRPBF for an LTC3633AIFE-2#TRPBF without adjusting feedback networks will result in regulation failure above 6V.
LTC3633AIFE-3#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):
- 1.5V
- Voltage - Output (Max):
- 12V
- 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-3#TRPBF FAQ
1.How can I place an order for LTC3633AIFE-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3633AIFE-3#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-3#TRPBF reliable?
The price and inventory of LTC3633AIFE-3#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-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3633AIFE-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3633AIFE-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3633AIFE-3#TRPBF?
LTC3633AIFE-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3633AIFE-3#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-3#TRPBF?
For technical support, including LTC3633AIFE-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3633AIFE-3#TRPBF requirements.
6.How does Aetrix verify that LTC3633AIFE-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3633AIFE-3#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-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3633AIFE-3#TRPBF?
All LTC3633AIFE-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3633AIFE-3#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-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3633AIFE-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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