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Analog Devices Inc. LTC3633EFE#TRPBF
- Part No.:
- LTC3633EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3633EFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,237
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Product details
Overview
LTC3633EFE#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel monolithic synchronous step-down regulator delivering 3A per channel from 3.6V–15V input, featuring controlled on-time current-mode architecture, 180° out-of-phase operation, and programmable 500kHz–4MHz switching frequency. It integrates two high-efficiency buck regulators with internal MOSFETs, 0.6V reference, and power-good status outputs-designed for point-of-load power in battery-powered instruments and distributed systems.
For engineers reviewing the LTC3633EFE#TRPBF datasheet, LTC3633EFE#TRPBF pinout, LTC3633EFE#TRPBF application, or LTC3633EFE#TRPBF equivalent, key selection considerations include dual-channel phase control, Burst Mode® vs forced continuous mode trade-offs, input overvoltage protection at 17.5V, thermal performance in TSSOP-28 (θJA = 25°C/W), and compatibility with external synchronization and output tracking.
Technical Context
The LTC3633EFE#TRPBF employs a constant-frequency controlled on-time current-mode architecture with internal PLL servoing to maintain precise switching frequency alignment across channels and against external sync signals. Its dual independent control loops use valley-current sensing via SW–PGND voltage drop and error amplifier output (ITH pins) to regulate inductor current based on 0.6V feedback reference.
Phase relationship is digitally selected via PHMODE pin (0° or 180°), enabling interleaved operation that reduces RMS input current and relaxes input capacitor requirements. MODE/SYNC pin simultaneously selects Burst Mode® (light-load efficiency) or forced continuous conduction, and accepts external clock input to lock both channels to an external source without mode override.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 15V - supports dual-cell Li-ion batteries and 5V/12V intermediate bus systems. |
| Output Current per Channel | 3A continuous - enables compact dual-rail POL supplies without external MOSFETs. |
| Switching Frequency Range | 500kHz to 4MHz - set by RT resistor; allows optimization of inductor size vs. efficiency (e.g., 1µH at 2MHz). |
| Feedback Reference Voltage | 0.6V ±1% - enables low-output voltages (e.g., 0.9V with 1:1.5 divider) with tight regulation. |
| Efficiency | Up to 95% - achieved at full load with 12VIN/3.3VOUT, critical for thermally constrained battery applications. |
| Thermal Resistance (θJA) | 25°C/W - measured in 28-lead TSSOP package, enabling 3A/channel operation up to +85°C ambient without forced airflow. |
| Protection Features | Input overvoltage lockout (17.5V), overtemperature shutdown, short-circuit protection, and PGOOD filtering (40µs debounce). |
Pinout & Package
Package: 28-Lead Plastic TSSOP (FE), exposed PGND pad soldered to PCB for thermal and electrical integrity. Pin pitch: 0.65mm; body size: 9.7mm × 4.4mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1 / ITH2 | Error amplifier output & compensation node | Direct access to loop compensation; connect RC network for stability tuning or tie to INTVCC for internal default compensation. |
| VIN1 / VIN2 | Independent power inputs per channel | Supports split-input architectures (e.g., VIN1 = 12V, VIN2 = 5V); each powers its own MOSFET pair and LDO. |
| SW1 / SW2 | Switch node terminals (dual) | High-slew connections to external inductors; require low-inductance layout to minimize EMI and shoot-through risk. |
| BOOST1 / BOOST2 | Floating gate drive supply | Boot capacitor connection point; enables high-side N-MOSFET drive with voltage swing up to VIN + INTVCC. |
| TRACKSS1 / TRACKSS2 | Tracking/soft-start control input | Internal 1.4µA pull-up enables soft-start via external capacitor; sub-0.6V forcing enables output voltage sequencing. |
| PGOOD1 / PGOOD2 | Open-drain power-good status | Active-low indication with ±8% fault threshold and ±5% release hysteresis; includes 40µs glitch filter. |
| PHMODE | Phase select logic input | Logic-high (INTVCC) forces 180° interleaving; logic-low (GND) forces in-phase operation - no floating allowed. |
| MODE/SYNC | Mode control & external sync input | Drives external clock to force synchronization and auto-select forced continuous mode; floating enables Burst Mode®. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel 180° interleaving | Reduces RMS input current ripple by ~30%, allowing smaller input capacitors and lower supply noise in multi-rail systems. |
| Burst Mode® operation | Quiescent current drops to 13µA per channel at light load, extending battery life in standby without sacrificing transient response. |
| Programmable switching frequency | RT resistor sets frequency from 500kHz to 4MHz - enables design flexibility between efficiency (low-f) and component size (high-f). |
| Integrated 2.5V linear regulator (V2P5) | 10mA output with ±0.4% load regulation - powers auxiliary circuitry (e.g., ADC references, level shifters) without external LDO. |
| Output voltage tracking & soft-start | TRACKSS pins support precise power sequencing (e.g., core before I/O) and controlled ramp-up to prevent inrush current damage. |
| Input overvoltage protection | Locks out operation above 17.5V (rising) and resumes at 16.5V (falling) - protects internal 130mΩ/65mΩ MOSFETs during transients. |
Applications
| Industrial PLC I/O Modules | Portable Medical Instrumentation |
|---|---|
Use Scenario: Dual-rail power for isolated analog front-end (±1.8V) and digital controller (3.3V) in handheld ultrasound probe. IC Role / Device Role / Timing Role: Primary dual-channel POL regulator supplying precision analog and low-noise digital domains with independent enable and sequencing. Use Value: Interleaved operation minimizes conducted EMI into sensitive analog signal paths; Burst Mode® extends battery runtime during idle scanning intervals. |
Use Scenario: Compact power solution for wearable ECG monitor requiring 1.2V core, 2.5V sensor bias, and 3.3V BLE radio rails. IC Role / Device Role / Timing Role: Single-chip dual-buck converter generating regulated outputs with synchronized soft-start to avoid brownout during wake-up. Use Value: Integrated V2P5 eliminates discrete LDO; 0.6V reference enables accurate low-voltage rails; TSSOP package fits space-constrained flex PCB layouts. |
| Test & Measurement Equipment | Automotive Infotainment Head Units |
Use Scenario: Powering FPGA core (1.0V) and DDR3 memory interface (1.5V) in benchtop logic analyzer with strict thermal limits. IC Role / Device Role / Timing Role: High-efficiency dual buck regulator operating from 12V intermediate bus, with phase control to reduce input capacitance demand. Use Value: 95% peak efficiency at full load keeps junction temperature below 105°C in sealed enclosure; PGOOD signals enable system-level fault logging. |
Use Scenario: Dual-rail supply for automotive-grade SoC (1.1V core, 3.3V peripherals) in head unit powered from 12V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Input-robust POL regulator with 15V max rating and 17.5V OVLO, supporting wide automotive input range including load dump. Use Value: Independent VIN1/VIN2 inputs allow separation of noisy and clean supplies; thermal performance in TSSOP meets AEC-Q200 derating guidelines. |
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 |
|---|---|---|---|
| MP2491DS-LF-Z | Single-channel 3A buck; no phase control, no Burst Mode®, fixed 500kHz frequency. | Requires two ICs for dual-rail; lacks tracking, PGOOD, and V2P5 output. | Select only when cost is primary constraint and dual-channel integration is unnecessary. |
| TPS543320RHLT | 3A dual-channel with PMBus interface, 400kHz–2.2MHz range, but requires external MOSFETs and has larger QFN-32 package. | Enables digital telemetry and dynamic voltage scaling; higher BOM count and layout complexity. | Prefer when system-level monitoring, remote configuration, or tighter output accuracy (<±0.5%) is required. |
Compared with MP2491DS-LF-Z and TPS543320RHLT, the LTC3633EFE#TRPBF delivers integrated dual-channel regulation with unique phase interleaving, analog tracking/soft-start, and ultra-low quiescent current in a mature, pin-compatible TSSOP footprint-making it optimal for space- and efficiency-sensitive analog-digital hybrid systems.
Availability
LTC3633EFE#TRPBF is available at Aetrix Electronics and suitable for industrial PLC I/O modules, portable medical instrumentation, test & measurement equipment, and automotive infotainment head units requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across temperature.
Supply support for LTC3633EFE#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 characterization and automotive/industrial qualification.
The LTC3633EFE#TRPBF belongs to Linear's monolithic synchronous buck regulator product line, engineered for high-density point-of-load conversion in battery-powered and thermally constrained systems where efficiency, small size, and reliability are critical.
FAQ
What is the maximum input voltage rating for the LTC3633EFE#TRPBF?
The LTC3633EFE#TRPBF has an absolute maximum input voltage rating of 16V on VIN1 and VIN2 pins, with transient tolerance up to 18V. Its input overvoltage protection activates at 17.5V (rising) and releases at 16.5V (falling), ensuring robust operation in 12V automotive and industrial environments where load dump or hot-swap events may occur. This protection is implemented independently per channel.
Does the LTC3633EFE#TRPBF support output voltage tracking between channels?
Yes, the LTC3633EFE#TRPBF supports precise output voltage tracking using the TRACKSS1 and TRACKSS2 pins. Applying a common ramp voltage (e.g., from an external DAC or RC network) to both pins forces each channel's FB pin to follow that voltage until it exceeds 0.6V, enabling coordinated startup and shutdown sequencing. The internal 1.4µA pull-up current also allows simple capacitor-based soft-start with adjustable ramp rate.
How does phase interleaving affect input capacitor selection for the LTC3633EFE#TRPBF?
When configured for 180° out-of-phase operation via the PHMODE pin, the LTC3633EFE#TRPBF interleaves the input current pulses of both channels, reducing RMS input ripple current by approximately 30% compared to in-phase operation. This allows designers to use smaller total input capacitance - typically 2× 22µF ceramic instead of 4× 22µF - while maintaining equivalent voltage ripple and thermal performance in the input stage.
Can the LTC3633EFE#TRPBF operate with different input voltages on VIN1 and VIN2?
Yes, the LTC3633EFE#TRPBF supports independent input supplies on VIN1 and VIN2. Each channel has its own power MOSFETs, bootstrap circuitry, and internal LDO (for INTVCC generation on VIN1), enabling flexible architectures such as powering Channel 1 from a 12V intermediate bus and Channel 2 from a dedicated 5V rail. This isolation prevents cross-talk and improves fault containment in multi-supply systems.
What is the thermal performance difference between the TSSOP and QFN packages of the LTC3633?
The LTC3633EFE#TRPBF in 28-lead TSSOP (FE) package has a junction-to-ambient thermal resistance (θJA) of 25°C/W, while the QFN-28 (UFD) variant measures 43°C/W. This 18°C/W advantage means the TSSOP version can deliver full 3A per channel at higher ambient temperatures - up to +85°C with minimal airflow - making it preferable for convection-cooled industrial enclosures where board real estate permits the larger footprint.
LTC3633EFE#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):
- 15V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 14.7V
- 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
LTC3633EFE#TRPBF FAQ
1.How can I place an order for LTC3633EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3633EFE#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 LTC3633EFE#TRPBF reliable?
The price and inventory of LTC3633EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3633EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3633EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3633EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3633EFE#TRPBF?
LTC3633EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3633EFE#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 LTC3633EFE#TRPBF?
For technical support, including LTC3633EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3633EFE#TRPBF requirements.
6.How does Aetrix verify that LTC3633EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3633EFE#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 LTC3633EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3633EFE#TRPBF?
All LTC3633EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3633EFE#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 LTC3633EFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3633EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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