My Inquiry
My Account
Analog Devices Inc. LTC3894EFE#TRPBF
- Part No.:
- LTC3894EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width), 16 Leads, Exposed Pad
- Datasheet:
-
LTC3894EFE#TRPBF.pdf
- Description:
- 150V LOW IQ STEP-DOWN DC/DC CONT
- Quantity:
- Payment:
- Shipping:
Inventory:4,475
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3894EFE#TRPBF from Analog Devices is a high-voltage, low-quiescent-current step-down DC/DC controller driving an external P-channel MOSFET. It supports 4.5V to 150V input, regulates 0.8V to 60V output, enables 100% duty cycle operation, and draws only 9µA IQ at 48VIN→3.3VOUT - ideal for automotive and industrial power systems requiring wide-input, high-reliability regulation.
For engineers reviewing the LTC3894EFE#TRPBF datasheet, LTC3894EFE#TRPBF pinout, LTC3894EFE#TRPBF application, or LTC3894EFE#TRPBF equivalent, key selection criteria include its 150V max VIN rating, programmable 50–850kHz switching frequency, RSENSE/DCR current sensing flexibility, Burst Mode® light-load efficiency, and integrated overvoltage/overcurrent/overtemperature protection with adjustable PGOOD thresholds.
Technical Context
The LTC3894EFE#TRPBF implements peak current-mode control with constant-frequency architecture, using an internal transconductance error amplifier (2mS) and slope compensation to stabilize loop response. Its gate driver delivers strong pull-up (2Ω) and pull-down (0.9Ω) capability for fast P-MOSFET switching, with VIN–CAP LDO regulated to 8.0V (±0.5V) and dropout as low as 4.4V at 15mA.
It features dual-mode light-load operation: selectable Burst Mode® (9µA IQ) or pulse-skipping via PLLIN/MODE pin configuration, plus programmable soft-start/tracking via TRACK/SS pin with internal 10µA current source. Input UVLO thresholds are configurable (3.75V or 6V) via DRVUV/EXTG pin, and OVLO/PGUV thresholds are resistor-programmable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 150V - supports direct connection to 48V, 72V, or 110V industrial bus rails without pre-regulation. |
| Output Voltage Range | 0.8V to 60V - enables single-controller solutions for 3.3V, 5V, 12V, 24V, or 48V system rails. |
| Quiescent Current | 9µA at 48VIN→3.3VOUT in Burst Mode - sustains battery-backed or always-on systems for years without significant drain. |
| Switching Frequency | 50kHz to 850kHz (resistor-programmable); 75–800kHz sync-capable - balances size, EMI, and efficiency across diverse power stages. |
| Current Sensing | RSENSE or DCR - eliminates need for dedicated sense resistors in high-current inductor designs, reducing conduction loss. |
| Protection Features | Programmable OVLO, PGOOD UV/OV monitoring, thermal shutdown - provides autonomous fault response without external supervision. |
| Package | 20-pin TSSOP (FE) with exposed pad - thermally enhanced for 38°C/W θJA; creepage-optimized for ≥150V isolation compliance. |
Pinout & Package
The LTC3894EFE#TRPBF is housed in a 20(16)-lead plastic TSSOP (FE package) with exposed GND pad (Pin 21), rated for TJMAX = 150°C and θJA = 38°C/W. The package removes leads to meet high-voltage creepage/clearance requirements per IEC 60950/62368.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE (1) | P-MOSFET gate drive output | Swings between CAP and VIN; actively pulls low (to VCAP) to turn on P-FET, high (to VIN) to turn off - enables true 100% duty cycle. |
| RUN (3) | Enable/disable control input | 1.24V threshold with 125mV hysteresis; <0.7V forces 7µA shutdown - supports sequenced power-up and brownout recovery. |
| SENSE+ / SENSE– (5,6) | Differential current sense inputs | Support Kelvin-connected RSENSE or DCR filter capacitor; SENSE– powers internal circuitry when >3.2V - improves accuracy and reduces noise coupling. |
| ITH (7) | Error amplifier output & compensation node | Sets peak current limit via voltage; connects to RC network for loop stability - central point for transient response tuning. |
| VFB (9) | Feedback voltage input | Regulates to 0.800V ±12mV; line/load regulation ≤0.015%/V and ≤0.15% - ensures tight output tolerance across operating conditions. |
| TRACK/SS (10) | Soft-start & tracking control | Internal 10µA pull-up enables capacitor-based ramp; accepts external divider for supply tracking - prevents inrush and enables coordinated rail sequencing. |
| FREQ (13) | Frequency setpoint input | 20µA current source drives RFREQ; ground = 350kHz, open = 535kHz - allows precise EMI optimization without oscillator drift. |
| PGOOD (12) | Open-drain power-good monitor | Asserts low on VFB >10% OV or PGUV <720mV UV; 100µs delay - provides reliable system-level power validation for FPGA/CPU reset logic. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty cycle operation | Enables dropout-free regulation down to VIN – VDROP, critical for battery-powered systems near end-of-life or low-VIN industrial transients. |
| 9µA quiescent current (Burst Mode) | Extends runtime in always-on applications such as telematics, remote sensors, or backup power controllers without compromising startup speed. |
| Programmable input OVLO | Resistor-divider on OVLO pin sets custom overvoltage trip (e.g., 60V or 100V), preventing damage during load dump or surge events in automotive environments. |
| Selectable light-load modes | Burst Mode® (low IQ) or pulse-skipping (lower ripple) chosen via PLLIN/MODE pin - gives designers explicit control over efficiency vs. noise trade-offs. |
| Thermally enhanced TSSOP | Exposed GND pad must be soldered to PCB; achieves 38°C/W θJA - enables >3A output without heatsink in compact industrial modules. |
Applications
| Automotive Power Supply | Industrial 48V Rail Converter |
|---|---|
Use Scenario: Regulating 12V/24V/48V battery or alternator input to stable 3.3V/5V for ADAS camera modules, infotainment ECUs, or CAN gateway processors. IC Role / Device Role / Timing Role: High-voltage step-down controller managing P-MOSFET switch, current sensing, and fault monitoring in nonsynchronous buck topology. Use Value: Withstands 150V load dump transients and maintains 9µA IQ during sleep mode - meets ISO 7637-2 Pulse 5a requirements while minimizing parasitic drain. | Use Scenario: Converting 48V intermediate bus to 12V or 5V for PLC I/O modules, motor drivers, or industrial HMIs operating in harsh factory environments. IC Role / Device Role / Timing Role: Primary DC/DC controller implementing peak current-mode regulation with programmable frequency and robust protection. Use Value: 150V input rating eliminates need for front-end TVS/clamping; 100% duty cycle supports brownout operation during 48V sag - improves system uptime. |
| Telecom Rectifier Module | Distributed Power Architecture |
Use Scenario: Secondary-side regulation in -48V telecom rectifiers delivering 3.3V/5V/12V to base station radios, optical transceivers, or fan controllers. IC Role / Device Role / Timing Role: Isolated secondary controller interfacing with optocoupler feedback, managing gate drive timing and current limiting. Use Value: RSENSE/DCR sensing flexibility accommodates high-current inductors; Burst Mode® maintains >85% efficiency at 1% load - reduces cooling requirements. | Use Scenario: Point-of-load conversion in server backplanes or data center racks where multiple independent 12V/5V rails feed ASICs, memory, and peripherals. IC Role / Device Role / Timing Role: Standalone buck controller synchronizing to system clock via PLLIN/MODE pin for EMI reduction across parallel converters. Use Value: Phase-lockable 75–800kHz frequency allows deterministic switching alignment - suppresses beat frequencies and simplifies EMI filter design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3895EFE#TRPBF | Includes integrated N-channel MOSFET driver for synchronous rectification; supports lower VOUT (0.5V) and higher max fSW (1MHz). | Required when synchronous buck efficiency >95% is mandatory at high load; not drop-in due to different gate drive topology and pinout. | Select LTC3895EFE#TRPBF only if synchronous operation and sub-1V outputs are needed; LTC3894EFE#TRPBF remains optimal for cost-sensitive, nonsynchronous, ultra-low-IQ designs. |
| LM5164QPWPRQ1 | 4.5–100V input, 100µA IQ, integrated 1.5A N-MOSFET; no P-MOSFET support or 100% duty cycle. | Suitable for lower-power (<2A), space-constrained automotive modules where integration outweighs IQ and dropout needs. | Choose LM5164QPWPRQ1 for compact, integrated solutions up to 100V; LTC3894EFE#TRPBF is preferred for >100V, <10µA IQ, or 100% duty cycle requirements. |
Compared with LTC3895EFE#TRPBF and LM5164QPWPRQ1, the LTC3894EFE#TRPBF uniquely combines 150V input rating, 9µA quiescent current, and true 100% duty cycle in a nonsynchronous P-MOSFET controller - making it irreplaceable for ultra-low-power, wide-input, dropout-critical industrial and automotive applications.
Availability
LTC3894EFE#TRPBF is available at Aetrix Electronics and suitable for automotive power supplies, industrial 48V rail converters, and telecom rectifier modules requiring stable component supply, long-term lifecycle assurance, and full traceability.
Supply support for LTC3894EFE#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LTC3894EFE#TRPBF belongs to Analog Devices' Power by Linear™ high-voltage DC/DC controller family, designed specifically for robust, low-IQ regulation in automotive, industrial, and telecom systems operating from unregulated 12V to 150V input sources.
FAQ
What is the maximum input voltage rating for the LTC3894EFE#TRPBF?
The LTC3894EFE#TRPBF has an absolute maximum input supply voltage (VIN) rating of 150V, with guaranteed operation from 4.5V to 150V. This enables direct interface with 48V, 72V, and 110V industrial buses and withstands automotive load dump transients per ISO 7637-2 without external clamping.
Does the LTC3894EFE#TRPBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC3894EFE#TRPBF supports true 100% duty cycle operation by driving an external P-channel MOSFET. When the GATE pin is pulled low to VCAP, the P-FET turns fully on, allowing continuous conduction - essential for maintaining regulation during deep input voltage sags, such as in automotive cold-crank or industrial brownout conditions.
How does the LTC3894EFE#TRPBF achieve ultra-low quiescent current, and what is its typical value?
The LTC3894EFE#TRPBF achieves 9µA quiescent current in Burst Mode® operation at 48VIN→3.3VOUT by disabling switching and biasing internal circuits into deep sleep. This value is measured under no-load conditions in the typical application circuit and is confirmed across temperature - enabling multi-year battery life in always-on remote sensors and telematics units.
Can the LTC3894EFE#TRPBF synchronize its switching frequency to an external clock, and what is the supported range?
Yes, the LTC3894EFE#TRPBF supports external clock synchronization via the PLLIN/MODE pin. It locks to input clocks from 75kHz to 800kHz with ±2.5% frequency tolerance, enabling deterministic EMI reduction in multi-converter systems. The internal VCO tracks rising edges of the external clock, ensuring phase-aligned switching across distributed power rails.
What package type and thermal characteristics does the LTC3894EFE#TRPBF use?
The LTC3894EFE#TRPBF uses a 20(16)-lead plastic TSSOP (FE package) with exposed GND pad (Pin 21). Its thermal resistance is θJA = 38°C/W when the exposed pad is properly soldered to a minimum 1-inch² copper area - enabling reliable operation at full load up to +125°C ambient without additional heatsinking.
LTC3894EFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width), 16 Leads, Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 150V
- Frequency - Switching:
- 50kHz ~ 850kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3894EFE#TRPBF FAQ
1.How can I place an order for LTC3894EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3894EFE#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 LTC3894EFE#TRPBF reliable?
The price and inventory of LTC3894EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3894EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3894EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3894EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3894EFE#TRPBF?
LTC3894EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3894EFE#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 LTC3894EFE#TRPBF?
For technical support, including LTC3894EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3894EFE#TRPBF requirements.
6.How does Aetrix verify that LTC3894EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3894EFE#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 LTC3894EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3894EFE#TRPBF?
All LTC3894EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3894EFE#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 LTC3894EFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3894EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3894EFE#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…
