My Inquiry
My Account
Analog Devices Inc. LTC3728EUH#TRPBF
- Part No.:
- LTC3728EUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3728EUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,372
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3728EUH#TRPBF from Analog Devices (formerly Linear Technology) is a dual-phase, 550kHz synchronous step-down switching regulator controller driving two independent N-channel MOSFET stages in 180° out-of-phase operation. It features ±1% output voltage accuracy, 0.8V reference, power good indicator, and supports input voltages from 3.5V to 36V - enabling use in notebook computers, telecom systems, and battery-powered digital devices.
For engineers reviewing the LTC3728EUH#TRPBF datasheet, LTC3728EUH#TRPBF pinout, LTC3728EUH#TRPBF application, or LTC3728EUH#TRPBF equivalent, key selection criteria include phase-locked frequency tuning (250–550kHz), OPTI-LOOP® compensation for wide output capacitance/ESR tolerance, dual independent RUN/SS soft-start & short-circuit shutdown, and FCB-selectable operating modes (Burst Mode®, constant-frequency PWM, forced continuous).
Technical Context
The LTC3728EUH#TRPBF implements a constant-frequency current-mode architecture with dual independent control loops, each featuring transconductance error amplifiers (gm = 1.3 mmho, GBW = 3 MHz) and precision 0.8V feedback references. Its 180° interleaved phase operation reduces input ripple by √2 and minimizes required input capacitance and EMI.
It integrates dual high-current gate drivers (TG/BG rise/fall times ≤90 ns), internal 5V INTVCC LDO (4.8–5.2V), dedicated 3.3V linear regulator (±0.5% load regulation), and robust protection including output overvoltage latch, foldback current limiting, and programmable short-circuit shutdown via RUN/SS pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports all common battery chemistries and industrial DC rails without external pre-regulation. |
| Output Voltage Accuracy | ±1% - ensures stable core voltage delivery for microprocessors and FPGAs across temperature and load. |
| Switching Frequency | 250kHz to 550kHz, phase-lockable - enables EMI reduction via synchronization and layout optimization for high-density PCBs. |
| Duty Cycle Max | 99.4% - allows ultra-low dropout operation (e.g., 5V-out from 5.2V-in), critical for battery-end-of-life scenarios. |
| Shutdown IQ | 20μA - minimizes quiescent drain in always-on subsystems such as real-time clocks or wake-on-LAN circuits. |
| PGOOD Threshold | ±7.5% of setpoint - provides reliable system-level power sequencing and fault detection for dual-rail supplies. |
| SENSE Pin Offset | ±60μA total source current - enables accurate current sensing with low-value RSENSE (e.g., 0.01Ω) while rejecting common-mode noise. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed thermal pad (SGND). Requires soldering of exposed pad to PCB ground plane for thermal performance (θJA = 68°C/W on 4-layer board) and electrical integrity.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VOSENSE1 / VOSENSE2 | Remote feedback input | Accepts resistive divider output for precise output voltage regulation; enables remote sensing to compensate for PCB trace IR drop. |
| RUN/SS1 / RUN/SS2 | Soft-start & short-circuit timer | Capacitor-based ramp controls startup inrush; also discharges during sustained overcurrent to trigger latched shutdown. |
| TG1/TG2, BG1/BG2 | N-MOSFET gate drivers | High-current (3A peak), fast-switching (≤90ns) drivers with bootstrap (TG) and ground-referenced (BG) outputs for synchronous rectification. |
| PLLIN / PLLFLTR | Phase-locked loop interface | Allows external clock synchronization (PLLIN) or DC voltage-controlled frequency tuning (PLLFLTR = 0–2.4V → 250–550kHz). |
| FCB | Operating mode selector | Selects Burst Mode® (0.8–VINTVCC−1V), constant-frequency (tied to INTVCC), or forced continuous (grounded) operation. |
| PGOOD | Open-drain status indicator | Asserts low when either VOSENSE pin deviates >±7.5% - used for system enable/disable sequencing and fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® compensation | Enables stable loop response across 10× variation in output capacitor ESR and capacitance - eliminates need for custom compensation per design. |
| Dual 180° interleaved phases | Reduces RMS input ripple current by ~30% vs. single-phase - permits smaller, lower-cost input capacitors and relaxed EMI filtering. |
| Independent RUN/SS control | Per-channel soft-start timing and short-circuit timeout - supports staggered power-up and asymmetric fault handling in multi-rail systems. |
| Integrated 3.3V linear regulator | 10mA DC / 50mA peak output - powers auxiliary circuitry (e.g., ADC references, level shifters) without requiring external LDO. |
| Output overvoltage protection | Latches bottom MOSFET ON until VOSENSE returns within ±7.5% - prevents damage to downstream logic during transient events or feedback failure. |
Applications
| High-Efficiency Notebook Power | Telecom DC-DC Distribution |
|---|---|
Use Scenario: Dual-rail 5V/3.3V conversion from 12V or 19V adapter in ultraportable notebooks. IC Role / Device Role: Dual-phase synchronous buck controller managing CPU core and I/O rail power delivery. Use Value: 180° interleaving cuts input capacitor count by 50% and lowers EMI emissions to meet CISPR-22 Class B limits without shielding. |
Use Scenario: Intermediate bus conversion (48V → 12V/5V) in telecom line cards with strict thermal constraints. IC Role / Device Role: High-efficiency, thermally optimized dual-output controller supporting hot-swap and redundancy requirements. Use Value: 99.4% max duty cycle enables operation down to 12.5V input during brownout, maintaining system uptime during grid fluctuations. |
| Battery-Powered Test Instruments | Industrial Embedded Systems |
Use Scenario: Portable oscilloscopes and multimeters powered by Li-ion packs (8.4V–12.6V) requiring clean, low-noise 3.3V/5V rails. IC Role / Device Role: Low-IQ, burst-mode-capable controller delivering regulated power with <20μA shutdown current. Use Value: Burst Mode® operation maintains >85% efficiency at 1mA load - extends battery life beyond 10 hours in standby mode. |
Use Scenario: DIN-rail mounted PLC modules needing isolated dual outputs (5V logic + 3.3V MCU) from unregulated 24VDC field supply. IC Role / Device Role: Robust, wide-input controller with UVLO (3.5V), OVP, and latchoff protection for harsh industrial environments. Use Value: ±1% output accuracy and remote sense ensure sensor ADC reference stability despite 200mV PCB trace drop at full load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP8770GQ-Z | Single-chip dual-phase controller with integrated MOSFETs (30V, 12A); no external driver stage; fixed 500kHz frequency only. | Suitable for space-constrained designs where board area is premium but thermal management is less critical. | Choose MP8770GQ-Z when integrating power stages simplifies layout and reduces BOM count - not for discrete MOSFET flexibility or frequency tuning. |
| LTC3855IUFD#PBF | Dual-phase controller with wider VIN range (4–38V), higher max fSW (850kHz), but no integrated 3.3V LDO or PLLIN sync capability. | Better suited for high-voltage industrial inputs and ultra-fast transient response needs, but lacks LTC3728EUH#TRPBF's burst-mode efficiency at light loads. | Choose LTC3855IUFD#PBF for >30V input systems or when >550kHz switching is required - avoid if 3.3V auxiliary rail or external sync is mandatory. |
Compared with MP8770GQ-Z and LTC3855IUFD#PBF, the LTC3728EUH#TRPBF uniquely combines discrete MOSFET drive flexibility, 250–550kHz tunable frequency, integrated 3.3V LDO, and true Burst Mode® operation - making it optimal for portable, battery-sensitive, and thermally constrained dual-rail applications.
Availability
LTC3728EUH#TRPBF is available at Aetrix Electronics and suitable for notebook computers, telecom power distribution systems, and battery-operated digital instrumentation requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for LTC3728EUH#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 analog and power management ICs with rigorous automotive- and industrial-grade qualification.
The LTC3728EUH#TRPBF belongs to Linear's high-efficiency synchronous buck controller product line, designed specifically for dual-rail, low-noise, high-density DC/DC conversion in portable and telecom infrastructure equipment.
FAQ
What is the maximum supported switching frequency for LTC3728EUH#TRPBF?
The LTC3728EUH#TRPBF supports a nominal switching frequency range of 250kHz to 550kHz. When the PLLFLTR pin is driven to ≥2.4V, the oscillator reaches its highest frequency of 550kHz (typical). This upper limit is guaranteed across the full –40°C to +85°C operating temperature range and enables compact magnetics and reduced output ripple in space-constrained designs.
Does LTC3728EUH#TRPBF support remote voltage sensing?
Yes, the LTC3728EUH#TRPBF supports remote voltage sensing via dedicated VOSENSE1 and VOSENSE2 pins. These inputs accept feedback from external resistor dividers placed directly at the load, compensating for IR drop across PCB traces and ensuring ±1% output regulation accuracy at the point-of-load - critical for powering sensitive microprocessors and ADCs.
How does the FCB pin affect operating mode selection in LTC3728EUH#TRPBF?
The FCB pin on the LTC3728EUH#TRPBF selects among three distinct operating modes: pulling FCB below 0.8V forces continuous PWM; holding it between 0.8V and (VINTVCC − 1V) enables Burst Mode®; tying it to INTVCC disables Burst Mode for constant-frequency operation. This pin also supports secondary winding regulation - a unique feature not found in most dual-phase controllers.
What protection features are integrated into LTC3728EUH#TRPBF?
The LTC3728EUH#TRPBF integrates multiple hardware-based protections: output overvoltage latch (OV comparator), foldback current limiting during short-circuit conditions, per-channel RUN/SS timed latchoff, undervoltage lockout (UVLO at 3.5V), and thermal shutdown (TJMAX = 125°C). All operate autonomously without firmware or external supervision - essential for safety-critical and unattended systems.
Can LTC3728EUH#TRPBF drive both high-side and low-side N-channel MOSFETs?
Yes, the LTC3728EUH#TRPBF drives both high-side (TG1/TG2) and low-side (BG1/BG2) N-channel MOSFETs using integrated floating gate drivers. TG outputs swing from SW node + (INTVCC − 0.5V), while BG outputs swing from PGND to INTVCC. Each driver delivers 3A peak current with ≤90ns transition times - enabling efficient synchronous rectification with minimal conduction and switching losses.
LTC3728EUH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 3.5V ~ 30V
- Frequency - Switching:
- 260kHz ~ 550kHz
- Duty Cycle (Max):
- 99.4%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3728EUH#TRPBF FAQ
1.How can I place an order for LTC3728EUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3728EUH#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 LTC3728EUH#TRPBF reliable?
The price and inventory of LTC3728EUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3728EUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3728EUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3728EUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3728EUH#TRPBF?
LTC3728EUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3728EUH#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 LTC3728EUH#TRPBF?
For technical support, including LTC3728EUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3728EUH#TRPBF requirements.
6.How does Aetrix verify that LTC3728EUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3728EUH#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 LTC3728EUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3728EUH#TRPBF?
All LTC3728EUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3728EUH#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 LTC3728EUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC3728EUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3728EUH#TRPBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
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…
