My Inquiry
My Account
Analog Devices Inc. LTC3633AEFE#TRPBF
- Part No.:
- LTC3633AEFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3633AEFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,635
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3633AEFE#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, adjustable switching frequency (500kHz–4MHz), and supports both Burst Mode® and forced continuous operation - ideal for point-of-load power in battery-powered instrumentation and distributed power systems.
For engineers reviewing the LTC3633AEFE#TRPBF datasheet, LTC3633AEFE#TRPBF pinout, LTC3633AEFE#TRPBF application, or LTC3633AEFE#TRPBF equivalent, key selection criteria include dual 3A output capability, 20V absolute max VIN, TSSOP-28 package compatibility, phase-shifted interleaving for reduced input ripple, and integrated overvoltage/overtemperature protection.
Technical Context
The LTC3633AEFE#TRPBF implements a controlled on-time, current-mode architecture with an internal PLL that locks switch timing to either an internal oscillator (set by RT resistor) or external clock applied to MODE/SYNC. Its dual independent buck channels share no power stage but synchronize phase via PHMODE pin to enable interleaved operation - reducing RMS input current and relaxing input capacitor requirements.
Each channel uses internal high-side and low-side MOSFETs (RDS(ON) = 130mΩ / 65mΩ), supports output voltage tracking and soft-start via TRACKSS pins, and delivers regulation using a precise 0.6V reference with ±1% initial accuracy. The device operates down to 5% duty cycle at 2.25MHz, enabling high-frequency, high-step-down-ratio designs with fast transient response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 20V - supports single Li-ion stack, 12V rail, and wide industrial input sources. |
| Output Current per Channel | 3A continuous - sufficient for FPGA core, DSP, or multi-rail SoC power domains. |
| Switching Frequency Range | 500kHz to 4MHz - programmable via RT resistor; enables compact magnetics and low-profile layout. |
| Feedback Reference Voltage | 0.6V ±1% - allows stable low-VOUT regulation (e.g., 0.8V, 1.0V, 1.2V) with standard resistor dividers. |
| Efficiency | Up to 95% - achieved at mid-load in forced continuous mode; Burst Mode extends light-load efficiency. |
| Phase Shift Control | Selectable 0° or 180° - reduces input capacitor RMS current by interleaving channel switching events. |
| Protection Features | Short-circuit, input overvoltage (22.5V lockout), overtemperature, and PGOOD status outputs - ensures robust system-level fault handling. |
Pinout & Package
Package: 28-Lead Plastic TSSOP (FE package), 4.4mm × 9.7mm body, exposed PGND pad (Pin 29) requiring PCB soldering for thermal and electrical integrity. θJA = 30°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 after return within ±5% - enables sequenced system startup. |
| RUN1 / RUN2 | Channel enable inputs | Active-high logic (1.22V threshold); independent control allows staggered turn-on or channel disable for dynamic power management. |
| TRACKSS1 / TRACKSS2 | Tracking/soft-start control inputs | Internal 1.4µA pull-up enables soft-start with external capacitor; sub-0.6V voltage forces output tracking of another rail. |
| VFB1 / VFB2 | Feedback inputs | Connect to resistor divider from VOUT to set regulated output; referenced to precise 0.6V internal bandgap. |
| ITH1 / ITH2 | Error amplifier outputs / compensation nodes | Interface for external Type II/III compensation networks; tie to INTVCC for internal default compensation. |
| VON1 / VON2 | On-time voltage inputs | Set on-time proportional to VOUT (0.6V–6V range for LTC3633A); enables constant-frequency operation across VOUT variations. |
| SW1 / SW2 | Switch node terminals | High-slew-rate connections to external inductors; swing from ~–0.3V to VIN - requires low-inductance layout and proper bootstrapping. |
| VIN1 / VIN2 | Independent input supplies | Supports dual-input configurations (e.g., separate battery and system rail); each rated 3.6V–20V. |
| BOOST1 / BOOST2 | Floating gate drive supplies | Bootstrap connections for high-side MOSFET drivers; require ceramic capacitors from BOOST to respective SW pins. |
| INTVCC | Internal 3.3V regulator output | Powers internal logic and drivers; must be decoupled with ≥1µF ceramic capacitor to PGND. |
| V2P5 | 2.5V auxiliary regulator output | Supplies 10mA; bypass with ≥1µF ceramic; tie to INTVCC if unused to disable. |
| PHMODE | Phase select input | Tie to GND for in-phase, to INTVCC for 180° out-of-phase operation - critical for input ripple reduction. |
| MODE/SYNC | Mode control & sync input | Ground = forced continuous; float/INTVCC = Burst Mode; external clock = synchronization + forced continuous. |
| RT | Oscillator frequency programming | Resistor to SGND sets fSW (500kHz–4MHz); tie to INTVCC for ~2MHz default. |
| SGND | Signal ground reference | Low-noise analog ground for feedback, compensation, and RT networks - must be separated from PGND at single point. |
| PGND | Power ground (exposed pad) | Return path for input/output capacitors and power MOSFETs; exposed pad must be soldered to PCB thermal plane. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3A synchronous buck channels | Monolithic integration eliminates external MOSFETs and drivers - reduces BOM count and layout complexity for dual-rail systems. |
| Controlled on-time current-mode architecture | Delivers fast load transient response and stable operation across wide VIN/VOUT ratios without slope compensation. |
| Selectably interleaved 180° phase operation | Halves effective input ripple frequency and reduces RMS input capacitor current - cuts required CIN volume by up to 40%. |
| Burst Mode® vs forced continuous mode | Enables <500µA quiescent current at light loads while maintaining full regulation; forced mode eliminates output ripple at cost of efficiency. |
| Integrated 0.6V reference and tracking/soft-start | Supports precise low-VOUT regulation and coordinated power sequencing across multiple rails using single external capacitor per channel. |
| Comprehensive protection suite | Includes input overvoltage lockout (22.5V), overtemperature shutdown, short-circuit current limiting, and PGOOD monitoring - reduces need for external supervision ICs. |
Applications
| Industrial PLC I/O Modules | Portable Test & Measurement Equipment |
|---|---|
Use Scenario: Powering isolated analog front-ends, ADCs, DACs, and microcontrollers from a 12V or 24V backplane supply. IC Role / Device Role: Dual-channel point-of-load regulator providing clean, sequenced 3.3V and 1.8V rails with tight regulation and low noise. Use Value: Interleaved phase operation minimizes conducted EMI on shared input bus; PGOOD signals enable safe firmware initialization sequence. |
Use Scenario: Battery-powered handheld oscilloscopes and multimeters requiring long runtime and stable analog supply rails. IC Role / Device Role: Primary DC/DC converter stepping down Li-ion (3.6V–16.8V) to 5V and 3.3V for digital and analog subsystems. Use Value: Burst Mode operation extends battery life during standby; 5% minimum duty cycle supports deep step-down (e.g., 12V→1.2V) at high frequency. |
| Telecom Remote Radio Units (RRUs) | Automotive ADAS Camera Modules |
Use Scenario: Distributed 48V-to-12V/5V conversion in outdoor base station cabinets with wide ambient temperature range. IC Role / Device Role: High-efficiency dual buck regulator operating across –40°C to 125°C junction temperature with robust thermal design. Use Value: 20V absolute max VIN withstands 48V transients; overtemperature protection prevents thermal runaway in sealed enclosures. |
Use Scenario: Compact camera ECU powering image sensor, ISP, and interface PHY from automotive 12V battery (with cold-crank tolerance). IC Role / Device Role: Dual-output regulator delivering 1.2V core and 2.8V I/O rails with soft-start and output tracking for controlled power-up. Use Value: TRACKSS pins enable synchronized ramp-up of sensor and processor rails; low 20ns minimum on-time supports cold-crank operation down to 4.5V input. |
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 |
|---|---|---|---|
| MPQ4436-AEC1 | Automotive-grade (AEC-Q100), 3.5A/channel, 4.5V–36V input, fixed 500kHz/2.2MHz options, no phase shift control | Requires external circuitry for interleaving; lacks TRACKSS and VON-based on-time scaling | Preferred for automotive environments where AEC-Q100 qualification is mandatory; less flexible for precision sequencing or wide VOUT ranges. |
| TPS543B20 | 3.5A/channel, 4.5V–18V input, PMBus interface, 300kHz–2MHz sync range, integrated telemetry (VOUT, IOUT, temp) | Requires digital configuration; no Burst Mode; larger QFN-32 package | Chosen when system-level telemetry, remote margining, or strict digital power management is required - not drop-in compatible. |
Compared with MPQ4436-AEC1 and TPS543B20, the LTC3633AEFE#TRPBF offers unique analog flexibility: seamless 0°/180° phase selection without external logic, VON-based adaptive on-time for stable high-frequency operation across VOUT, and integrated soft-start/tracking with minimal external components - making it optimal for space-constrained, analog-sensitive, or thermally demanding industrial designs.
Availability
LTC3633AEFE#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, portable test equipment, telecom RRUs, and automotive ADAS camera modules requiring stable component supply, extended temperature support (–40°C to 125°C), and long-term production continuity.
Supply support for LTC3633AEFE#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3633A product line was designed for high-density, high-efficiency dual-rail point-of-load conversion in space- and thermal-constrained systems - emphasizing analog control precision, robust protection, and layout-friendly integration without digital overhead.
FAQ
What is the maximum input voltage rating for the LTC3633AEFE#TRPBF?
The LTC3633AEFE#TRPBF has an absolute maximum input voltage rating of 20V on VIN1 and VIN2 pins. This distinguishes it from the earlier LTC3633 (16V max) and enables reliable operation with 12V systems experiencing transient spikes or 16.8V Li-ion stacks. Operation above 20V risks permanent damage per Absolute Maximum Ratings.
Does the LTC3633AEFE#TRPBF support output voltage tracking between its two channels?
Yes, the LTC3633AEFE#TRPBF supports output voltage tracking via dedicated TRACKSS1 and TRACKSS2 pins. Applying a ramp voltage (e.g., from another regulator's soft-start node) below 0.6V to either pin causes the corresponding channel's output to follow that voltage until reaching regulation. This enables precise power sequencing in multi-rail systems without external op-amps.
Can the LTC3633AEFE#TRPBF operate with only one channel enabled?
Yes, the LTC3633AEFE#TRPBF supports independent channel control: pulling RUN1 low disables Channel 1 while Channel 2 remains fully operational, and vice versa. Both channels share no critical bias paths, so single-channel operation maintains full specifications including efficiency, transient response, and protection functionality for the active channel.
What is the purpose of the VON1 and VON2 pins on the LTC3633AEFE#TRPBF?
The VON1 and VON2 pins set the on-time comparator threshold to make the regulator's on-time proportional to the output voltage - enabling constant-frequency operation even as VOUT changes. For the LTC3633AEFE#TRPBF (LTC3633A variant), VON accepts 0.6V–6V, allowing stable regulation from 0.6V up to 6V outputs without frequency drift, unlike fixed-frequency controllers dependent on external resistors alone.
How does the PHMODE pin affect system performance in the LTC3633AEFE#TRPBF?
The PHMODE pin selects between in-phase (PHMODE = GND) and 180° out-of-phase (PHMODE = INTVCC) switching of the two channels. Out-of-phase operation interleaves input current pulses, reducing RMS input ripple by up to 30% and relaxing input capacitor requirements - directly improving EMI profile and power delivery stability in shared-input systems.
LTC3633AEFE#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
LTC3633AEFE#TRPBF FAQ
1.How can I place an order for LTC3633AEFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3633AEFE#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 LTC3633AEFE#TRPBF reliable?
The price and inventory of LTC3633AEFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3633AEFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3633AEFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3633AEFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3633AEFE#TRPBF?
LTC3633AEFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3633AEFE#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 LTC3633AEFE#TRPBF?
For technical support, including LTC3633AEFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3633AEFE#TRPBF requirements.
6.How does Aetrix verify that LTC3633AEFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3633AEFE#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 LTC3633AEFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3633AEFE#TRPBF?
All LTC3633AEFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3633AEFE#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 LTC3633AEFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3633AEFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3633AEFE#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…
