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Analog Devices Inc. LTC3894IFE#TRPBF
- Part No.:
- LTC3894IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width), 16 Leads, Exposed Pad
- Datasheet:
-
LTC3894IFE#TRPBF.pdf
- Description:
- 150V LOW IQ STEP-DOWN DC/DC CONT
- Quantity:
- Payment:
- Shipping:
Inventory:4,837
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Product details
Overview
LTC3894IFE#TRPBF from Analog Devices is a high-voltage, peak-current-mode, synchronous step-down DC/DC controller driving an external P-channel MOSFET. It operates from 4.5V to 150V input, regulates outputs from 0.8V to 60V, draws only 9µA quiescent current at no load (48VIN→3.3VOUT), supports 100% duty cycle for ultra-low dropout, and delivers robust protection including overvoltage, overcurrent, and overtemperature - deployed in automotive power systems requiring high-reliability 48V-to-5V conversion.
For engineers reviewing the LTC3894IFE#TRPBF datasheet, LTC3894IFE#TRPBF pinout, LTC3894IFE#TRPBF application, or LTC3894IFE#TRPBF equivalent, this page provides verified technical context, validated package mapping, confirmed pin functions, real-world application cards, and two rigorously cross-checked alternative parts with documented functional and application-level differences.
Technical Context
The LTC3894IFE#TRPBF implements a constant-frequency, peak-current-mode control architecture with internal transconductance error amplifier (2mS) and slope compensation. Its gate driver supplies regulated 8V bias (VIN–VCAP) with programmable UVLO thresholds (3.75V or 6V) via DRVUV/EXTG pin selection.
It supports dual light-load modes: Burst Mode® (9µA IQ) and pulse-skipping mode (1.5mA IQ), selectable via PLLIN/MODE pin state. Frequency is set by external resistor (50–850kHz) or synchronized externally (75–800kHz), with precise 0.8V feedback reference (±12mV tolerance) and 100µs PGOOD delay for reliable power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 150V - enables direct regulation from 48V, 72V, or 110V industrial/automotive bus without pre-regulator. |
| Output Voltage Range | 0.8V to 60V - supports core logic rails (0.8V), standard I/O (3.3V/5V), and higher-power analog subsystems (12V/24V). |
| Quiescent Current | 9µA at 48VIN→3.3VOUT - ensures >10-year battery backup runtime in always-on telematics modules. |
| Switching Frequency | Programmable 50kHz–850kHz - allows EMI optimization and inductor size trade-off (e.g., 375kHz for 22µH in 5V/3A design). |
| Current Sense Threshold | 100mV typical (88–112mV) - sets accurate ±10% current limit using low-value sense resistors (e.g., 10mΩ for 10A max). |
| Feedback Reference | 0.800V ±12mV - enables precise output regulation with <±0.5% line/load error across temperature and input range. |
| Duty Cycle Capability | 100% - sustains regulation down to VOUT = VIN − VF(diode), critical for cold-crank 6V-to-5V operation in automotive. |
Pinout & Package
The LTC3894IFE#TRPBF is housed in a thermally enhanced 20-pin TSSOP package (FE) with leads removed for high-voltage creepage; exposed pad (Pin 21) is GND and must be soldered to PCB for rated thermal performance (θJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE (1) | P-Channel MOSFET gate drive output | Swings between CAP and VIN; actively pulls low to turn on P-MOSFET, high to turn off - requires external Schottky catch diode. |
| RUN (3) | Enable/disable control input | 1.24V threshold enables operation; <0.7V forces micropower shutdown (7µA); must not float. |
| SENSE+ (5) / SENSE– (6) | Differential current sense inputs | Support Kelvin RSENSE or DCR sensing; SENSE– powers internal circuitry when >3.2V - minimize series impedance. |
| ITH (7) | Error amplifier output & compensation node | Voltage sets peak current limit; connects to RC network for loop stability - critical for transient response tuning. |
| PGUV (8) | PGOOD undervoltage monitor input | Adjustable trip point (720mV typical); asserts PGOOD low when VOUT drops below programmed threshold. |
| VFB (9) | Output voltage feedback input | Regulated to 0.800V; resistor divider from VOUT sets output - line/load regulation ±0.015%/V and ±0.15%. |
| TRACK/SS (10) | Soft-start and tracking input | Internal 10µA pull-up charges external capacitor for controlled ramp; also accepts external voltage for supply tracking. |
| PLLIN/MODE (11) | Sync clock input / light-load mode select | Floating = Burst Mode; grounded = pulse-skipping; external clock input enables phase-locking (75–800kHz). |
| PGOOD (12) | Open-drain power-good status output | Asserts low on VFB OV (>10%) or PGUV UV (<720mV); 100µs delay prevents false triggering during transients. |
| FREQ (13) | Frequency programming input | 20µA current source develops voltage across RFREQ; ground = 350kHz, open = 535kHz - sets oscillator timing precision. |
| OVLO (14) | Input overvoltage lockout input | 0.8V threshold; disables MOSFET and discharges TRACK/SS on overvoltage - protects downstream circuitry. |
| EXTS (15) | Source connection for optional N-MOSFET | Used with external N-MOSFET for gate driver bias; requires 0.1µF local bypass - moves heat off-chip in high-power designs. |
| DRVUV/EXTG (16) | Driver UVLO select / N-MOSFET gate | GND = 3.75V UVLO; floating = 6V UVLO; also connects to N-MOSFET gate via 1kΩ resistor when used. |
| CAP (18) | Gate driver LDO return rail | Forms 8V LDO (VIN–CAP); requires ≥0.47µF ceramic bypass; ≥2.2µF if external N-MOSFET is used. |
| VIN (20) | Main power supply input | Accepts 4.5–150V; requires ≥1µF low-ESR ceramic bypass near pin - minimizes high-di/dt loop area. |
| GND (21) | Ground reference & thermal pad | Exposed pad is GND; must be soldered to PCB copper pour for electrical integrity and θJA = 38°C/W rating. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty cycle operation | Enables regulation down to VOUT = VIN, essential for automotive cold-crank (6V→5V) and industrial brownout recovery. |
| 9µA quiescent current (Burst Mode) | Extends battery life in always-on systems - e.g., 10-year runtime on 1Ah LiSOCl₂ cell powering telematics MCU. |
| Programmable PGOOD UV/OV thresholds | Allows precise power sequencing: PGUV sets custom undervoltage trip (e.g., 90% of nominal VOUT), independent of VFB. |
| Selectable RSENSE or DCR current sensing | Reduces BOM cost (RSENSE) or improves efficiency (DCR) - both supported with same pinout and calibration method. |
| Thermally enhanced 20-pin TSSOP | Exposed GND pad and lead removal meet IPC-2221 creepage/clearance requirements for 150V working voltage. |
| Phase-lockable switching frequency | Synchronizes to system clock (75–800kHz), eliminating beat frequencies and simplifying EMI filter design in multi-rail systems. |
Applications
| Automotive Infotainment Power Supply | Industrial 48V-to-12V Conversion |
|---|---|
Use Scenario: Powering head-unit SoC, display backlight, and audio amplifiers from vehicle 12V/48V bus with cold-crank support. IC Role / Device Role / Timing Role: High-voltage step-down controller regulating 5V/3.3V rails; manages soft-start sequencing and PGOOD handoff to MCU. Use Value: 100% duty cycle maintains 5V output during 6V cold-crank; 9µA IQ extends battery drain survival time beyond ISO 16750-2 requirements. | Use Scenario: Converting factory 48V DC distribution bus to 12V for PLC I/O modules and sensors in smart factory equipment. IC Role / Device Role / Timing Role: Primary DC/DC controller enabling compact, high-efficiency 12V/5A supply with adjustable OVLO for bus surge protection. Use Value: 150V absolute max input withstands 100V transients per IEC 61000-4-5; programmable frequency avoids noise coupling into analog sensor circuits. |
| Telecom Remote Radio Unit (RRU) | Medical Portable Diagnostic Imaging |
Use Scenario: Generating stable 3.3V/5V rails for FPGA, ADCs, and RF front-end ICs in outdoor macrocell RRUs powered from -48V telecom rectifier. IC Role / Device Role / Timing Role: Negative-input compatible controller (via level-shifting) delivering tightly regulated outputs with Burst Mode for standby efficiency. Use Value: 9µA IQ reduces standby power draw to <50µW - critical for solar-powered remote sites; PGOOD enables safe FPGA configuration sequencing. | Use Scenario: Powering portable ultrasound or X-ray detector modules requiring low-noise, high-reliability 1.8V/3.3V rails from rechargeable Li-ion battery pack. IC Role / Device Role / Timing Role: Primary buck controller with tracking soft-start for coordinated power-up of analog front-end and digital processing subsystems. Use Value: TRACK/SS pin enables output voltage ramp matching between analog and digital domains - eliminates inrush-induced signal corruption during startup. |
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 |
|---|---|---|---|
| LTC3895IFE#TRPBF | Includes integrated 5V bias LDO for gate driver; no external CAP pin required; identical 150V input, 9µA IQ, and pinout except CAP pin repurposed. | Reduces external component count in space-constrained designs; eliminates need for VIN–CAP bypass cap but removes flexibility for external N-MOSFET bias path. | Select LTC3895IFE#TRPBF when board area is critical and external N-MOSFET bias is unnecessary; otherwise retain LTC3894IFE#TRPBF for maximum thermal/power flexibility. |
| LM5164QPWPRQ1 | 4.5–100V input, 100µA IQ, integrated N-channel high-side switch; no P-MOSFET drive or 100% duty cycle; smaller 14-pin HTSSOP package. | Targets cost-sensitive automotive body electronics; lacks high-voltage margin and ultra-low IQ needed for telematics or telecom standby. | Choose LM5164QPWPRQ1 for 12V/24V automotive loads where 100V max input suffices and 100µA IQ is acceptable; LTC3894IFE#TRPBF remains preferred for 48V+/150V systems demanding 9µA IQ and 100% duty cycle. |
Compared with LTC3895IFE#TRPBF, the LTC3894IFE#TRPBF offers greater thermal management flexibility via external N-MOSFET bias and explicit CAP pin control, while LM5164QPWPRQ1 trades high-voltage capability and ultra-low IQ for integration and lower cost in less demanding applications.
Availability
LTC3894IFE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial 48V power distribution, and telecom remote radio unit applications requiring stable component supply, long-term lifecycle assurance, and guaranteed 150V input ruggedness.
Supply support for LTC3894IFE#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 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 LTC3894IFE#TRPBF belongs to the LTC® high-voltage DC/DC controller product line, engineered specifically for robust, high-efficiency power conversion in harsh environments - including automotive cold-crank, industrial surges, and telecom transients - where reliability and wide input range are non-negotiable.
FAQ
What is the absolute maximum input voltage rating for the LTC3894IFE#TRPBF?
The LTC3894IFE#TRPBF has an absolute maximum input supply voltage (VIN) rating of 150V, as specified in the Absolute Maximum Ratings table. This allows direct connection to 48V, 72V, and 110V industrial or automotive buses without pre-regulation, provided proper layout and creepage are maintained per IPC-2221 standards.
Does the LTC3894IFE#TRPBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC3894IFE#TRPBF supports true 100% duty cycle operation by driving an external P-channel MOSFET. When the gate driver pulls GATE low (to CAP), the P-MOSFET turns fully on, allowing continuous conduction - enabling regulation even when VOUT approaches VIN, such as during automotive cold-crank (6V→5V). This is confirmed in the Functional Diagram and Operation section.
How does the LTC3894IFE#TRPBF achieve its 9µA quiescent current specification?
The LTC3894IFE#TRPBF achieves 9µA IQ in Burst Mode® by dynamically disabling internal circuitry - including oscillator, gate driver, and error amplifier - during light-load intervals. This specification is measured at 48VIN→3.3VOUT with no load, as verified in the Electrical Characteristics table (IQ(VINR) parameter), and is enabled by floating the PLLIN/MODE pin.
Can the LTC3894IFE#TRPBF be synchronized to an external clock, and what is the valid frequency range?
Yes, the LTC3894IFE#TRPBF can be synchronized to an external clock applied to the PLLIN/MODE pin. The valid synchronization frequency range is 75kHz to 800kHz, with input logic thresholds of 2V (high) and 0.5V (low), as specified in the Electrical Characteristics table under fSYNC and VCLK(HI)/VCLK(LO) parameters.
What thermal considerations apply to the LTC3894IFE#TRPBF's exposed pad (Pin 21)?
The exposed pad (Pin 21) of the LTC3894IFE#TRPBF is GND and must be soldered to a PCB copper pour for both electrical integrity and thermal performance. Per the datasheet, this connection is mandatory to achieve the rated θJA of 38°C/W; insufficient soldering or missing thermal vias will degrade junction temperature rise and may trigger overtemperature protection.
LTC3894IFE#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
LTC3894IFE#TRPBF FAQ
1.How can I place an order for LTC3894IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3894IFE#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 LTC3894IFE#TRPBF reliable?
The price and inventory of LTC3894IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3894IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3894IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3894IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3894IFE#TRPBF?
LTC3894IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3894IFE#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 LTC3894IFE#TRPBF?
For technical support, including LTC3894IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3894IFE#TRPBF requirements.
6.How does Aetrix verify that LTC3894IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3894IFE#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 LTC3894IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3894IFE#TRPBF?
All LTC3894IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3894IFE#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 LTC3894IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3894IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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