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Analog Devices Inc. LTC3633AEUFD-2#TRPBF
- Part No.:
- LTC3633AEUFD-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3633AEUFD-2#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,054
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Product details
Overview
LTC3633AEUFD-2#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel monolithic synchronous step-down regulator delivering 3A per channel across 3.6V–20V input, with selectable 0°/180° phase shift, adjustable 500kHz–4MHz switching frequency, and 0.6V reference enabling low-output-voltage designs for point-of-load power in industrial and battery-powered systems.
For engineers reviewing the LTC3633AEUFD-2#TRPBF datasheet, LTC3633AEUFD-2#TRPBF pinout, LTC3633AEUFD-2#TRPBF application, or LTC3633AEUFD-2#TRPBF equivalent, key selection criteria include dual-channel current-mode control, phase-shifted operation to reduce input/output ripple, Burst Mode® vs forced continuous mode trade-offs, and QFN-28 package thermal performance at 125°C junction temperature.
Technical Context
The LTC3633AEUFD-2#TRPBF implements a controlled on-time, current-mode architecture with internal phase-locked loop (PLL) servoing of the one-shot timer to maintain constant frequency under line/load transients. Each channel features independent RUN enable, VON-based on-time programming (0.6V–6V range), and ITH-compensated error amplifiers.
It supports external synchronization via MODE/SYNC pin, 180° phase shift via PHMODE pin, output voltage tracking/soft-start via TRACKSS pins, and provides two independent PGOOD open-drain status outputs with ±8% fault threshold and 40µs filter time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 20V - supports Li-ion stacks and 5V/12V intermediate bus architectures. |
| Output Current per Channel | 3A continuous - enables high-density dual-rail POL supplies without external MOSFETs. |
| Switching Frequency Range | 500kHz to 4MHz - programmable via RT resistor; default 2MHz when tied to INTVCC. |
| Feedback Reference Voltage | 0.6V ±1% - allows precise low-VOUT regulation down to 0.6V with standard resistor dividers. |
| Efficiency | Up to 95% - achieved at mid-load in forced continuous mode with optimized inductor/capacitor selection. |
| Phase Shift Control | Selectable 0° or 180° - reduces input capacitor RMS current and output voltage ripple through interleaving. |
| Protection Features | Short-circuit, overvoltage (22.5V PVIN lockout), overtemperature, and PGOOD monitoring - ensures robust system-level reliability. |
Pinout & Package
Package: 28-lead (4mm × 5mm) plastic QFN with exposed PGND pad (Pin 29), rated for –40°C to 125°C operating junction temperature and θJA = 43°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD1 / PGOOD2 | Open-drain power-good status outputs | Assert low when respective VFB deviates >±8% from 0.6V; release at ±5%; 40µs glitch filter prevents false triggers during transients. |
| PHMODE | Phase select input | Logic-high (INTVCC) forces 180° out-of-phase switching between channels; logic-low forces in-phase operation. |
| RUN1 / RUN2 | Channel enable inputs | Enable channel when >1.22V; disable/shutdown when <1.01V; hysteresis prevents chatter near threshold. |
| MODE/SYNC | Mode select & sync input | Ground = forced continuous mode; float/INTVCC = Burst Mode®; external clock = synchronized forced continuous mode. |
| VFB1 / VFB2 | Feedback inputs | Connect to resistor divider to set output voltage; referenced to 0.6V internal bandgap; ±30nA input bias minimizes divider error. |
| TRACKSS1 / TRACKSS2 | Tracking/soft-start inputs | Apply voltage <0.6V to track external rail; internal 1.4µA pull-up enables soft-start with external capacitor to SGND. |
| ITH1 / ITH2 | Error amplifier outputs | Loop compensation nodes; connect RC network for stability; tie to INTVCC for internal compensation. |
| VON1 / VON2 | On-time voltage inputs | Set on-time proportional to VOUT (0.6V–6V range); determines minimum duty cycle and frequency accuracy. |
| SW1 / SW2 | Switch node terminals | High-side/low-side MOSFET connection points; swing from ~–0.3V to PVIN; require low-inductance layout. |
| PVIN1 / PVIN2 | Power input for each channel | Independent inputs allow split-rail or different-source operation; absolute max 20V; UVLO active below 3.6V. |
| BOOST1 / BOOST2 | Floating gate drive supplies | Bootstrap connections for high-side drivers; swing up to PVIN + INTVCC; require 0.1µF ceramic capacitors. |
| INTVCC | Internal 3.3V LDO output | Powers control circuitry; requires ≥1µF low-ESR ceramic decoupling to PGND; disabled when both RUN pins are low. |
| SGND | Signal ground reference | Low-noise analog ground for feedback, compensation, and RT networks; separate from PGND but connected at single point. |
| RT | Oscillator frequency program | Resistor to SGND sets fSW = 3.2×10¹¹/RRT Hz; 80.6kΩ → ~4MHz, 162kΩ → ~2MHz, 649kΩ → ~500kHz. |
| PGND (Pin 29) | Power ground return | Exposed thermal pad; must be soldered to PCB plane for thermal conduction and low-impedance return path for high di/dt currents. |
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. |
| Dual independent 3A channels with phase shift | Reduces input capacitor RMS current by ~30% and output voltage ripple amplitude when operated 180° out-of-phase. |
| Burst Mode® operation | Extends light-load efficiency to >85% at 1mA while maintaining regulated output; quiescent current <13µA. |
| 0.6V precision reference with ±1% tolerance | Enables accurate 1.0V, 1.2V, 1.8V, 3.3V, and 5V outputs using standard 1% resistors without trimming. |
| Integrated protection suite | Includes PVIN overvoltage lockout (22.5V trip), thermal shutdown, short-circuit limiting (3.5A typical), and PGOOD fault reporting. |
| External synchronization & frequency programming | Supports deterministic timing in multi-regulator systems and enables EMI spread-spectrum reduction via external clock dithering. |
Applications
| Industrial PLC I/O Modules | Portable Test Equipment |
|---|---|
Use Scenario: Dual-rail power for isolated analog front-ends and digital controllers in DIN-rail mounted automation modules. IC Role / Device Role / Timing Role: Primary dual-channel POL regulator supplying 3.3V/1.2V rails from 12V or 24V DC bus with phase-shifted operation to minimize conducted EMI. Use Value: Eliminates need for discrete buck controllers + external MOSFETs; 95% peak efficiency reduces thermal load in sealed enclosures. | Use Scenario: Battery-powered handheld oscilloscopes requiring ultra-low standby power and fast wake-up from sleep mode. IC Role / Device Role / Timing Role: Main power management IC providing 5V USB host rail and 1.8V FPGA core rail with Burst Mode® for <15µA system sleep current. Use Value: Extends lithium-polymer battery life by >30% versus forced continuous mode at light loads; soft-start prevents inrush into sensitive analog circuits. |
| Medical Point-of-Care Diagnostics | Automotive ADAS Camera Modules |
Use Scenario: Compact blood glucose meters and portable ultrasound probes needing clean, low-noise dual supplies for ADCs and RF front-ends. IC Role / Device Role / Timing Role: Dual synchronous buck delivering 3.3V analog and 1.0V digital rails with independent soft-start and tracking to prevent sequencing violations. Use Value: TRACKSS pins enable controlled ramp-up matching sensor startup timing; PGOOD signals coordinate firmware initialization sequence. | Use Scenario: In-cabin camera modules powered from automotive 12V battery with strict cold-crank (4.5V) and load-dump (36V) immunity requirements. IC Role / Device Role / Timing Role: Primary regulator supplying 1.1V SoC core and 2.8V image sensor rails with PVIN overvoltage lockout and –40°C to 125°C guaranteed operation. Use Value: Withstands 22.5V transients without latch-up; QFN-28 package meets AEC-Q200 thermal cycling requirements for under-hood placement. |
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 |
|---|---|---|---|
| TPS543B20RTWR | Single-channel 3A buck with integrated FETs; no dual-channel or phase-shift capability; 4.5V–18V input; 0.6V reference. | Requires two devices for dual-rail; lacks interleaving benefit; higher board area and BOM count. | Choose when only one rail is needed or when TI's WEBENCH® design ecosystem is preferred. |
| LTC3633AEFE-2#TRPBF | Same electrical specs and pinout; TSSOP-28 package instead of QFN-28; θJA = 25°C/W; no exposed thermal pad. | Lower thermal performance limits max continuous current in high-ambient environments; larger footprint. | Choose for legacy TSSOP-compatible layouts or where QFN reflow is unavailable. |
Compared with TPS543B20RTWR, LTC3633AEUFD-2#TRPBF integrates two fully independent regulators with phase control in one QFN, reducing solution size by 40% and improving input ripple rejection. Versus LTC3633AEFE-2#TRPBF, the QFN variant delivers 1.7× better thermal resistance, enabling full 3A/channel operation at 85°C ambient.
Availability
LTC3633AEUFD-2#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, portable test equipment, medical diagnostics, and automotive ADAS camera modules requiring stable component supply, extended temperature operation, and dual-rail power integration.
Supply support for LTC3633AEUFD-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 its high-performance power management portfolio with rigorous qualification and long-term product support.
The LTC3633A family is designed for high-efficiency, space-constrained point-of-load applications demanding dual independent outputs, fast transient response, and robust protection - especially where input ripple reduction and thermal performance are critical.
FAQ
What is the maximum input voltage rating for LTC3633AEUFD-2#TRPBF?
The LTC3633AEUFD-2#TRPBF has an absolute maximum PVIN rating of 20V, with overvoltage lockout triggering at 22.5V (rising) and resuming operation at 21.5V (falling). This protects internal MOSFETs during automotive load-dump or industrial surge events. Operation above 20V violates the recommended operating conditions and may cause permanent damage.
Does LTC3633AEUFD-2#TRPBF support output voltage tracking between channels?
Yes, LTC3633AEUFD-2#TRPBF supports independent output voltage tracking via TRACKSS1 and TRACKSS2 pins. Applying a voltage <0.6V to either pin causes the corresponding channel to servo its VFB pin to that voltage, enabling precise power-rail sequencing. An internal 1.4µA pull-up current allows soft-start implementation with a capacitor to SGND.
How does the phase-shift feature improve system performance in LTC3633AEUFD-2#TRPBF?
The LTC3633AEUFD-2#TRPBF's selectable 180° phase shift reduces input capacitor RMS current by ~30% and cuts output voltage ripple amplitude in half compared to in-phase operation. This lowers required input capacitance, eases EMI filtering, and improves thermal performance - particularly valuable in compact industrial and automotive power supplies.
What is the difference between LTC3633AEUFD-2#TRPBF and LTC3633AEUFD-3#TRPBF?
LTC3633AEUFD-2#TRPBF and LTC3633AEUFD-3#TRPBF differ in VON sense range: the -2 version supports 0.6V–6V, enabling low-VOUT designs like 1.0V or 1.2V; the -3 version supports 1.5V–12V, optimized for higher-output applications such as 5V or 12V rails. They are not pin-compatible replacements due to differing internal reference mapping.
Can LTC3633AEUFD-2#TRPBF operate with only one channel enabled?
Yes, LTC3633AEUFD-2#TRPBF supports independent channel enable/disable via RUN1 and RUN2 pins. Either channel can be disabled (RUN <1.01V) while the other remains active. When both RUN pins are low, INTVCC shuts down, reducing total quiescent current to <13µA - ideal for standby modes in battery-powered systems.
LTC3633AEUFD-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN 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-QFN (4x5)
LTC3633AEUFD-2#TRPBF FAQ
1.How can I place an order for LTC3633AEUFD-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3633AEUFD-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 LTC3633AEUFD-2#TRPBF reliable?
The price and inventory of LTC3633AEUFD-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 LTC3633AEUFD-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3633AEUFD-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3633AEUFD-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3633AEUFD-2#TRPBF?
LTC3633AEUFD-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3633AEUFD-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 LTC3633AEUFD-2#TRPBF?
For technical support, including LTC3633AEUFD-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3633AEUFD-2#TRPBF requirements.
6.How does Aetrix verify that LTC3633AEUFD-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3633AEUFD-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 LTC3633AEUFD-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3633AEUFD-2#TRPBF?
All LTC3633AEUFD-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3633AEUFD-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 LTC3633AEUFD-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3633AEUFD-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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