My Inquiry
My Account
Analog Devices Inc. LTC3633EUFD#TRPBF
- Part No.:
- LTC3633EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3633EUFD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,853
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3633EUFD#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, using controlled on-time current-mode architecture with phase-lockable 500kHz–4MHz switching. It supports 180° out-of-phase operation to reduce input/output capacitance requirements and integrates a 2.5V linear regulator (V2P5), power-good outputs, and tracking/soft-start for point-of-load power in battery-powered instruments and distributed systems.
For engineers reviewing the LTC3633EUFD#TRPBF datasheet, LTC3633EUFD#TRPBF pinout, LTC3633EUFD#TRPBF application, or LTC3633EUFD#TRPBF equivalent, key selection considerations include its dual 3A output capability, 0.6V reference enabling low-voltage rails, programmable frequency via RT resistor, Burst Mode® vs forced continuous mode selection, and QFN-28 (4mm × 5mm) thermal performance with exposed PGND pad.
Technical Context
The LTC3633EUFD#TRPBF implements a constant-frequency, current-mode control loop where an internal PLL locks the one-shot on-time timer to either an internal oscillator (set by RT resistor) or external clock applied to MODE/SYNC. Each channel features independent RUN enable, VFB feedback, ITH compensation, and VON-based adaptive on-time scaling below 6V output.
Its dual-channel architecture supports 0° or 180° phase shift via PHMODE pin, reducing RMS input current ripple and relaxing input capacitor sizing. Protection includes VIN overvoltage lockout (17.5V trip), overtemperature shutdown, short-circuit limiting (±2A to +4.5A valley current), and PGOOD filtering (40µs delay) to suppress transient-induced false faults.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 15V - supports dual-cell Li-ion and 5V/12V intermediate bus supplies |
| Output Current per Channel | 3A continuous - enables compact dual-rail POL conversion without external MOSFETs |
| Switching Frequency Range | 500kHz to 4MHz - set by RT resistor (80kΩ–640kΩ); 2MHz default when RT = INTVCC |
| Feedback Reference Voltage | 0.6V ±1% - allows precise low-output voltages (e.g., 0.9V with 1:1.5 divider) |
| Efficiency | Up to 95% - achieved at full load with optimized inductor/capacitor selection |
| Quiescent Current | 1.3mA (both channels active), 500µA (Burst Mode), 13µA (shutdown) - critical for battery runtime |
| Thermal Performance | θJA = 43°C/W - enabled by 4mm × 5mm QFN-28 with soldered exposed PGND pad |
Pinout & Package
Package: 28-lead (4mm × 5mm) plastic QFN (UFD) with exposed PGND pad (Pin 29), rated for –40°C to 125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD1 / PGOOD2 | Open-drain power-good status | Active-low signal indicating ±8% regulation error; releases at ±5% with 40µs filter to reject transients |
| RUN1 / RUN2 | Channel enable inputs | Enable above 1.22V (typ), disable below 1.01V (typ); hysteresis prevents chatter during ramp-up |
| VFB1 / VFB2 | Feedback voltage inputs | Connect to resistor divider; internal 0.6V reference sets output voltage (VOUT = 0.6V × (1 + R1/R2)) |
| ITH1 / ITH2 | Error amplifier outputs | Loop compensation node; connect RC network for stability or tie to INTVCC for internal compensation |
| TRACKSS1 / TRACKSS2 | Tracking/soft-start inputs | Internal 1.4µA pull-up enables soft-start with external capacitor; <0.6V forces tracking mode |
| SW1 / SW2 | Switch node outputs | High-side/low-side MOSFET connection points; swing from ~–0.3V to VIN; require low-ESR ceramic bypass |
| VIN1 / VIN2 | Independent input supplies | Supports split-input configurations; each powers its channel's MOSFETs and INTVCC LDO (from VIN1) |
| BOOST1 / BOOST2 | Floating gate drive supplies | Bootstrap connections for high-side drivers; swing from ~INTVCC–0.7V to VIN+INTVCC |
| MODE/SYNC | Mode select & sync input | Ground = forced continuous; float/INTVCC = Burst Mode®; external clock = synchronization + forced continuous |
| PHMODE | Phase configuration | Ground = in-phase switching; INTVCC = 180° out-of-phase to reduce input ripple current |
| V2P5 | 2.5V linear regulator output | 10mA capable; bypass with ≥1µF ceramic; tie to INTVCC if unused to disable |
| INTVCC | 3.3V internal supply | Powers control circuitry; disabled when both RUN pins are low; decouple with ≥1µF ceramic |
| RT | Oscillator frequency program | Resistor to SGND sets fSW = 3.2×10¹¹/RRT Hz; 160kΩ → ~2MHz |
| SGND | Signal ground reference | Low-noise return for feedback, compensation, and RT networks; separate from PGND |
| PGND | Power ground (exposed pad) | Must be soldered to PCB plane for thermal conduction and low-impedance return path for input/output capacitors |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3A synchronous buck channels | Monolithic integration eliminates external high-side/low-side MOSFETs and reduces BOM count |
| 180° interleaved phase operation | Halves RMS input current ripple, enabling smaller input capacitors and lower supply noise |
| Burst Mode® and forced continuous modes | Enables >90% efficiency at light loads (Burst) while maintaining fast transient response at full load (continuous) |
| 0.6V precision reference with tracking | Supports sub-1V outputs and seamless power sequencing across multiple rails via TRACKSS pins |
| Integrated 2.5V/3.3V auxiliary regulators | V2P5 (10mA) and INTVCC (internal) reduce need for external bias supplies in multi-rail systems |
| Robust protection suite | VIN overvoltage lockout (17.5V), overtemperature shutdown, short-circuit current limiting, and PGOOD filtering |
Applications
| Point-of-Load Power Supply | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Providing tightly regulated 1.8V and 3.3V rails to FPGA I/O banks and core logic from a 12V intermediate bus in industrial PLC modules. IC Role / Device Role / Timing Role: Dual-channel synchronous buck regulator delivering 3A per rail with independent enable and tracking for safe power sequencing. Use Value: Eliminates discrete DC/DC converters and external MOSFETs, reducing board area by >40% while maintaining <±1% output accuracy under dynamic load steps. |
Use Scenario: Powering microcontroller, sensor front-end, and wireless transceiver in handheld medical diagnostic equipment powered by dual-cell Li-ion (6.4V–8.4V). IC Role / Device Role / Timing Role: Primary POL regulator with Burst Mode® operation extending battery life during sleep cycles and forced continuous mode ensuring clean power during data acquisition bursts. Use Value: Achieves >92% efficiency at 10mA load (Burst) and <100µVrms output noise at 3A (continuous), meeting stringent EMI and battery runtime requirements. |
| Distributed Power Architecture | Test & Measurement Equipment |
Use Scenario: Generating isolated 5V and 12V analog supply rails from a shared 15V backplane in modular instrumentation chassis. IC Role / Device Role / Timing Role: Dual-channel buck converter operating 180° out-of-phase to minimize input ripple current into shared bulk capacitance. Use Value: Reduces required input capacitance by 3× compared to in-phase operation, lowering system cost and improving voltage stability during simultaneous channel load transients. |
Use Scenario: Supplying low-noise ±5V and +3.3V rails to high-resolution ADCs, DACs, and op-amp signal chains in benchtop oscilloscopes. IC Role / Device Role / Timing Role: Precision POL regulator with 0.6V reference, soft-start, and independent compensation (ITH pins) for optimal loop stability across varying loads. Use Value: Delivers <10µVpp output ripple in forced continuous mode and supports <10ns load-step response time, preserving signal integrity in 16-bit measurement paths. |
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 |
|---|---|---|---|
| TPS543320RTVR | Single-channel 3A buck with PMBus interface; no integrated 2.5V LDO or phase-shift capability | Requires two devices for dual-rail; supports digital telemetry but lacks TRACKSS/soft-start flexibility | Select when digital monitoring and margining are required over analog simplicity and dual-channel integration |
| MP2451DT-LF-Z | Single-channel 2A buck; fixed 2.2MHz frequency; no Burst Mode®, no phase control, no auxiliary regulators | Needs two ICs plus external LDOs for dual-rail; limited to 6V max input; no PGOOD or tracking | Select only for cost-sensitive, single-rail, low-input-voltage (<6V) applications where feature set is secondary |
Compared with TPS543320RTVR and MP2451DT-LF-Z, the LTC3633EUFD#TRPBF provides true monolithic dual 3A regulation with integrated phase control, auxiliary supplies, and analog flexibility-reducing component count and layout complexity in space-constrained, high-performance POL designs.
Availability
LTC3633EUFD#TRPBF is available at Aetrix Electronics and suitable for point-of-load power supplies, battery-powered instrumentation, and distributed power architectures requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3633EUFD#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 automotive-grade qualification and long-term product longevity commitments.
The LTC3633EUFD#TRPBF belongs to Linear's monolithic synchronous buck regulator family, designed specifically for high-efficiency, low-noise, dual-rail point-of-load conversion in space-constrained industrial, test equipment, and portable applications.
FAQ
What is the maximum input voltage rating for the LTC3633EUFD#TRPBF?
The LTC3633EUFD#TRPBF has an absolute maximum input voltage of 16V on VIN1 and VIN2 pins, with transient rating up to 18V. Its operational input range is 3.6V to 15V. The device includes VIN overvoltage protection that disables switching when VIN exceeds 17.5V (rising) and resumes operation once VIN falls below 16.5V (falling). This ensures robustness against supply transients in 12V bus systems.
How does the PHMODE pin affect channel timing in the LTC3633EUFD#TRPBF?
The PHMODE pin on the LTC3633EUFD#TRPBF selects between in-phase and 180° out-of-phase operation: grounding PHMODE forces both channels to switch simultaneously, while tying it to INTVCC aligns SW2 falling edge 180° out of phase with SW1 falling edge. This interleaving reduces RMS input current ripple by up to 30%, relaxing input capacitor requirements and lowering supply noise in multi-rail systems.
Can the LTC3633EUFD#TRPBF operate with different input voltages on VIN1 and VIN2?
Yes, the LTC3633EUFD#TRPBF supports independent input supplies: VIN1 powers Channel 1 and the INTVCC LDO, while VIN2 powers Channel 2 separately. This enables flexible power architectures such as using a 5V rail for one channel and a 12V rail for another, or isolating noisy supplies. Both inputs must remain within 3.6V–15V, and each channel's protection (e.g., overvoltage lockout) operates independently.
What is the function of the TRACKSS1 and TRACKSS2 pins on the LTC3633EUFD#TRPBF?
The TRACKSS1 and TRACKSS2 pins on the LTC3633EUFD#TRPBF provide output voltage tracking and soft-start functionality. An internal 1.4µA pull-up current allows soft-start by connecting a capacitor to SGND; forcing voltage <0.6V on these pins causes the regulator to servo VFB to the TRACKSS voltage instead of the 0.6V reference, enabling precise power sequencing across multiple rails during startup or brownout recovery.
Does the LTC3633EUFD#TRPBF require external compensation components?
The LTC3633EUFD#TRPBF supports both internal and external loop compensation. Connecting ITH1 or ITH2 to INTVCC enables default internal compensation for standard applications. For optimized transient response or non-standard output capacitors, external RC networks can be connected to ITH1/ITH2 - the error amplifier transconductance is 1.8mS, and design guidance for type-II/type-III compensation is provided in the datasheet's Applications Information section.
LTC3633EUFD#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):
- 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-QFN (4x5)
LTC3633EUFD#TRPBF FAQ
1.How can I place an order for LTC3633EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3633EUFD#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 LTC3633EUFD#TRPBF reliable?
The price and inventory of LTC3633EUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3633EUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3633EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3633EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3633EUFD#TRPBF?
LTC3633EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3633EUFD#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 LTC3633EUFD#TRPBF?
For technical support, including LTC3633EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3633EUFD#TRPBF requirements.
6.How does Aetrix verify that LTC3633EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3633EUFD#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 LTC3633EUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3633EUFD#TRPBF?
All LTC3633EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3633EUFD#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 LTC3633EUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3633EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3633EUFD#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
