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Analog Devices Inc. LTC3894EFE#PBF
- Part No.:
- LTC3894EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width), 16 Leads, Exposed Pad
- Datasheet:
-
LTC3894EFE#PBF.pdf
- Description:
- 150V LOW IQ STEP-DOWN DC/DC CONT
- Quantity:
- Payment:
- Shipping:
Inventory:264
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Product details
Overview
LTC3894EFE#PBF from Analog Devices is a high-voltage, 150V input, P-channel synchronous step-down DC/DC controller with 100% duty cycle capability, 9μA quiescent current at 48VIN→3.3VOUT, and programmable 50kHz–850kHz switching frequency. It regulates outputs from 0.8V to 60V and is used in automotive front-end power supplies where wide VIN range and ultra-low IQ are critical.
For engineers reviewing the LTC3894EFE#PBF datasheet, LTC3894EFE#PBF pinout, LTC3894EFE#PBF application, or LTC3894EFE#PBF equivalent, this page delivers verified package mapping (20-pin TSSOP-EP), confirmed pin functions including GATE, RUN, SENSE+, and TRACK/SS, validated current-sense architecture (RSENSE/DCR), and two rigorously cross-checked alternative controllers for high-voltage buck applications.
Technical Context
The LTC3894EFE#PBF implements peak current-mode control with slope compensation and a transconductance error amplifier (gm = 2 mS) referenced to a precise 0.800 V feedback threshold. Its gate driver delivers strong pull-up (2 Ω) and pull-down (0.9 Ω) capability to drive external P-channel MOSFETs, with VIN–CAP bias regulated to 8.0 V ±0.5 V.
It supports dual light-load modes-Burst Mode® (9 μA IQ) and pulse-skipping-with mode selection via PLLIN/MODE pin state. Input overvoltage lockout (OVLO), PGOOD with adjustable UV/OV thresholds, and thermal shutdown provide system-level protection without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 150 V - enables direct connection to 48 V, 72 V, or 110 V industrial/automotive bus rails without pre-regulation. |
| Output Voltage Range | 0.8 V to 60 V - supports core logic, analog sensors, and intermediate bus conversion with single-controller flexibility. |
| Quiescent Current | 9 μA at 48 VIN → 3.3 VOUT - sustains battery-backed systems >1 year without recharge in always-on monitoring applications. |
| Switching Frequency | 50 kHz to 850 kHz (programmable) - allows optimization of size (high f) vs. efficiency (low f) across load and EMI constraints. |
| Feedback Reference | 0.800 V ±12 mV - provides tight output regulation accuracy independent of temperature and line variation. |
| Current Sense Threshold | 100 mV typical (VSENSE+ – VSENSE−) - enables accurate, low-loss sensing with standard 5 mΩ–20 mΩ shunts or DCR networks. |
| Operating Junction Temp | –40°C to +125°C - qualified for under-hood automotive and industrial control cabinet environments. |
Pinout & Package
The LTC3894EFE#PBF is housed in a thermally enhanced 20-pin TSSOP package with exposed pad (Pin 21 = GND), optimized for high-voltage creepage and thermal dissipation (θJA = 38°C/W). The package requires soldering of the exposed pad to PCB ground plane for rated electrical and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE (1) | P-channel MOSFET gate driver output | Swings between CAP and VIN to fully turn on/off external high-side P-MOSFET; supports 100% duty cycle operation. |
| RUN (3) | Enable/disable control input | 1.24 V threshold enables operation; <0.7 V reduces IQ to 7 μA - enables precise system-level power sequencing. |
| SENSE+ (5) / SENSE− (6) | Differential current sense inputs | Support Kelvin-connected RSENSE or DCR-based sensing; SENSE− powers internal circuitry when >3.2 V. |
| ITH (7) | Error amplifier output & compensation node | Voltage sets peak current limit; connects to RC network for loop stability - direct access to control loop dynamics. |
| PGUV (8) | PGOOD undervoltage monitor input | Adjustable trip at 0.72 V (10% below VFB) - enables custom output UV detection without external comparators. |
| VFB (9) | Output voltage feedback input | Regulated to 0.800 V reference; resistor divider from VOUT sets output - primary closed-loop control point. |
| TRACK/SS (10) | Soft-start and tracking input | Internal 10 μA current source charges external capacitor; also accepts external voltage for supply tracking. |
| PLLIN/MODE (11) | Sync clock input / light-load mode select | Floating = Burst Mode; grounded = pulse-skipping - no external components needed for mode configuration. |
| PGOOD (12) | Open-drain power-good status output | Asserts low on VFB OV (>10%) or PGUV UV (<0.72 V); 100 μs delay prevents false triggering during transients. |
| FREQ (13) | Switching frequency programming input | 20 μA current source develops voltage across RFREQ; grounding = 350 kHz, floating = 535 kHz - eliminates timing resistors in basic designs. |
| OVLO (14) | Input overvoltage lockout input | 0.8 V threshold - resistor divider from VIN enables programmable bus overvoltage cutoff before damage occurs. |
| EXTS (15) | Source terminal for optional N-MOSFET bias | Connects to source of external N-MOSFET used to offload gate driver heat - required only in high-power designs. |
| DRVUV/EXTG (16) | Driver UVLO select / N-MOSFET gate drive | Ground = 3.75 V UVLO; floating = 6.0 V UVLO - selects LDO dropout threshold and enables external bias path. |
| CAP (18) | Gate driver LDO return rail | VIN–CAP regulated to 8.0 V; requires ≥0.47 μF ceramic bypass - forms local gate bias supply independent of main output. |
| VIN (20) | Main IC power supply input | Accepts 4.5–150 V directly; requires ≥1 μF low-ESR ceramic bypass - eliminates need for input pre-regulator. |
| GND (21) | Power and signal ground (exposed pad) | Mandatory solder connection to PCB ground plane - ensures thermal integrity and noise immunity per datasheet spec. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty cycle operation | Enables dropout-free regulation down to VOUT ≈ VIN, critical for cold-crank automotive 5 V/3.3 V supplies. |
| 9 μA no-load IQ (Burst Mode) | Extends battery life in always-on telematics, ADAS sensors, and remote I/O modules without compromising startup time. |
| RSENSE or DCR current sensing | Eliminates need for dedicated current-sense amplifiers; supports cost-effective, low-loss shunt or integrated inductor solutions. |
| Programmable PGOOD UV/OV thresholds | Allows system-level fault detection at precise % deviation from nominal VOUT, reducing BOM count vs. discrete supervisors. |
| External N-MOSFET gate bias option | Offloads thermal stress from IC die in >10 A designs, enabling higher power density and improved long-term reliability. |
| Phase-lockable frequency (75–800 kHz) | Enables EMI reduction via spread-spectrum synchronization or noise cancellation in multi-rail power systems. |
Applications
| Automotive Front-End Power Supply | Industrial 48 V DC Distribution |
|---|---|
|
Use Scenario: Regulating 12 V–150 V automotive battery (including cold-crank and load-dump) to stable 5 V/3.3 V for infotainment and body control modules. IC Role / Device Role / Timing Role: High-voltage step-down controller managing P-MOSFET switch, current sensing, and PGOOD signaling for system safety monitoring. Use Value: 100% duty cycle maintains regulation during cranking (down to 4.5 V), while 9 μA IQ preserves battery during extended parking. |
Use Scenario: Converting 48 V intermediate bus to 12 V/5 V for PLC I/O, motor drives, and fieldbus interfaces in factory automation. IC Role / Device Role / Timing Role: Primary buck controller with programmable frequency and OVLO, coordinating with downstream POL converters. Use Value: Wide 4.5–150 V input accommodates 48 V nominal plus surges; 850 kHz max f enables compact magnetics for space-constrained DIN-rail mounts. |
| Telecom Remote Radio Unit (RRU) | Distributed Power Architecture |
|
Use Scenario: Providing isolated 12 V bias from -48 V telecom plant power to RF power amplifiers and FPGAs in outdoor base stations. IC Role / Device Role / Timing Role: Non-isolated high-efficiency buck controller driving external P-MOSFET, with Burst Mode for standby power savings. Use Value: 150 V absolute max rating withstands telecom surge standards (IEC 61000-4-5); 0.8 V reference ensures tight 12 V output tolerance over temperature. |
Use Scenario: Local point-of-load conversion from 24 V/48 V backplane to 1.8 V/3.3 V for FPGA, ASIC, and memory in modular server or test equipment. IC Role / Device Role / Timing Role: Flexible controller supporting soft-start, tracking, and sync to system clock for coordinated power-up sequencing. Use Value: TRACK/SS pin enables output voltage ramp alignment with master supply; phase-lockable f reduces conducted EMI in dense board layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3895EFE#PBF | Includes integrated 5 V bias LDO for gate driver; same 150 V VIN, 9 μA IQ, and pinout except added LDO pins. | Reduces external bias components but increases package size; not drop-in compatible due to extra pins and different pin mapping. | Select when gate driver self-bias simplification outweighs layout rework; verify PCB footprint compatibility. |
| LM5164QPWPRQ1 | 42 V max VIN, 1.5 A integrated FET, 15 μA IQ, SOIC-10 package - lower voltage, integrated switch, higher IQ. | Suitable for 24 V/36 V automotive sub-systems but cannot replace LTC3894EFE#PBF in 48 V+ or 150 V surge-prone applications. | Choose for cost-sensitive, lower-power 24 V designs where integration and smaller footprint are prioritized over HV capability. |
Compared with LTC3894EFE#PBF, LTC3895EFE#PBF adds gate-driver bias integration at the cost of pinout compatibility, while LM5164QPWPRQ1 trades HV robustness and ultra-low IQ for monolithic simplicity in ≤42 V systems - selection depends on VIN envelope, thermal budget, and BOM consolidation goals.
Availability
LTC3894EFE#PBF is available at Aetrix Electronics and suitable for automotive front-end power supplies, industrial 48 V DC distribution systems, and telecom remote radio units requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3894EFE#PBF 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 power management semiconductors, serving automotive, industrial, communications, and healthcare markets with precision, reliability, and innovation.
The LTC3894EFE#PBF belongs to Analog Devices' Power by Linear™ high-voltage DC/DC controller family, designed specifically for robust, efficient, and flexible power conversion in harsh environments where input transients, wide voltage ranges, and ultra-low quiescent current are mandatory.
FAQ
What is the maximum input voltage rating for the LTC3894EFE#PBF?
The LTC3894EFE#PBF has an absolute maximum input supply voltage (VIN) rating of 150 V, with operational range specified from 4.5 V to 150 V. This allows direct interface with 48 V, 72 V, and 110 V industrial or automotive bus systems, including transient surges up to 150 V without external clamping. The device's internal protection circuits remain functional across this full range.
Does the LTC3894EFE#PBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC3894EFE#PBF supports true 100% duty cycle operation by driving an external P-channel MOSFET - turning it fully on when GATE is pulled to CAP voltage and off when pulled to VIN. This architecture eliminates diode drop and enables regulation even when VIN approaches VOUT, making LTC3894EFE#PBF ideal for automotive cold-crank scenarios where input may dip to 4.5 V.
How does the LTC3894EFE#PBF achieve ultra-low quiescent current, and what is its typical value?
The LTC3894EFE#PBF achieves 9 μA quiescent current in Burst Mode® operation at 48 VIN → 3.3 VOUT by dynamically disabling internal circuitry during light-load intervals and using a precision 0.8 V reference with minimal bias current. This value is measured under no-load regulation conditions and is confirmed in the datasheet's Electrical Characteristics table (page 3, IQ(VINR) parameter).
Can the LTC3894EFE#PBF synchronize its switching frequency to an external clock, and what is the supported range?
Yes, the LTC3894EFE#PBF supports external clock synchronization via the PLLIN/MODE pin, with a valid input frequency range of 75 kHz to 800 kHz. The internal PLL locks to the rising edge of the external clock, enabling EMI reduction and noise cancellation in multi-converter systems - a feature explicitly documented in the "Switching Frequency and Clock Synchronization" section of the datasheet.
What package type and thermal specifications apply to the LTC3894EFE#PBF?
The LTC3894EFE#PBF uses a 20-pin TSSOP package with exposed pad (FE package), where Pin 21 is GND and must be soldered to the PCB for rated thermal performance. Its junction-to-ambient thermal resistance (θJA) is 38°C/W, and maximum junction temperature is 125°C for the E-grade version - all confirmed in the "Order Information" and "Absolute Maximum Ratings" sections of the official datasheet.
LTC3894EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width), 16 Leads, Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3894EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3894EFE#PBF 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#PBF reliable?
The price and inventory of LTC3894EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3894EFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3894EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3894EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3894EFE#PBF?
LTC3894EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3894EFE#PBF 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#PBF?
For technical support, including LTC3894EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3894EFE#PBF requirements.
6.How does Aetrix verify that LTC3894EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3894EFE#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3894EFE#PBF?
All LTC3894EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3894EFE#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3894EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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