My Inquiry
My Account
Analog Devices Inc. LTC3895IFE#PBF
- Part No.:
- LTC3895IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Datasheet:
-
LTC3895IFE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:200
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3895IFE#PBF from Analog Devices (formerly Linear Technology) is a high-voltage synchronous step-down DC/DC controller driving all-N-channel MOSFETs, supporting input voltages up to 140V and output voltages from 0.8V to 60V. It features constant-frequency current-mode control up to 850kHz, 40μA no-load quiescent current, and integrated charge pump enabling 100% duty cycle operation - ideal for automotive battery systems and telecom power supplies.
For engineers reviewing the LTC3895IFE#PBF datasheet, LTC3895IFE#PBF pinout, LTC3895IFE#PBF application, or LTC3895IFE#PBF equivalent, key selection criteria include its 140V max VIN rating, programmable gate drive (5–10V), OPTI-LOOP® compensation, selectable light-load modes (Burst Mode®, pulse-skipping, forced continuous), and 38-lead TSSOP high-voltage package with exposed thermal pad.
Technical Context
The LTC3895IFE#PBF implements a constant-frequency peak-current-mode architecture with phase-lockable oscillator (75–850kHz), enabling precise timing synchronization across multi-phase systems. Its dual-loop control integrates an error amplifier (ITH node) and current comparator referenced to SENSE+/SENSE–, with adjustable current limit thresholds (50/75/100mV) set via ILIM pin configuration.
Three independent LDO paths supply DRVCC: internal VIN-based, external NMOS-driven NDRV LDO, and EXTVCC-input LDO with switchover thresholds (4.7V or 7.7V) selected by DRVUV. Gate drive voltage is programmable via DRVSET (5–10V), and top-side driver uses integrated charge pump (CPUMP_EN enabled) or bootstrap refresh (CPUMP_EN disabled) for dropout operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V - supports wide-range industrial and automotive battery inputs including 48V, 72V, and 100V bus systems. |
| Output Voltage Range | 0.8V to 60V - adjustable via external resistor divider or fixed 3.3V/5V via VPRG pin, enabling direct regulation for FPGA, ASIC, and DSP core supplies. |
| Quiescent Current | 40μA (no load) - extends runtime in always-on battery-powered systems such as telematics and remote sensors. |
| Switching Frequency | 75kHz to 850kHz (phase-lockable) - allows EMI optimization and compact magnetics design while supporting PolyPhase® synchronization. |
| Duty Cycle Capability | 100% - enables dropout operation at ultra-low VIN–VOUT differentials, critical for cold-crank automotive scenarios. |
| Gate Drive Voltage | Programmable 5V to 10V (OPTI-DRIVE™) - matches logic-level or standard-level MOSFETs to maximize efficiency across load conditions. |
| Reference Voltage | Precision 0.8V ±1% - ensures tight output regulation accuracy over temperature and line/load variations. |
Pinout & Package
Package: 38-lead plastic TSSOP (FE package), exposed pad (Pin 39) soldered to PCB ground for thermal and electrical performance. θJA = 28°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (30) | Main high-voltage input supply | Accepts up to 140V; bypassed with ceramic capacitor to GND for noise suppression and transient response. |
| TG (20) | Top-gate driver output | Floating high-side driver with swing = DRVCC superimposed on SW node; drives N-channel MOSFET gate. |
| SW (21) | Switch node connection | Connects to inductor and BOOST capacitor; carries high dv/dt switching waveform. |
| BG (24) | Bottom-gate driver output | Ground-referenced driver (0 to DRVCC) for synchronous N-channel MOSFET. |
| SENSE+ / SENSE– (3/4) | Differential current sense inputs | Measure voltage across RSENSE to set current limit; support common-mode range up to 65V. |
| VFB (6) | Feedback input | Compares output voltage against 0.8V reference; used with external divider or internal fixed-ratio resistors. |
| PGOOD (14) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from setpoint - enables system sequencing and fault reporting. |
| RUN (34) | Enable/shutdown control | Logic-high (>1.12V) enables operation; <0.7V forces full shutdown (IQ ≈ 10μA). |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows stable loop compensation across wide ranges of output capacitance and ESR - eliminates need for iterative tuning during board bring-up. |
| No external bootstrap diode required | Integrated switch in top-gate driver reduces BOM count and improves reliability in high-vibration environments. |
| Selectably optimized light-load operation | Configurable Burst Mode®, pulse-skipping, or forced continuous mode via MODE pin - balances efficiency vs. output ripple per application need. |
| Programmable DRVCC voltage | 5V–10V adjustment via DRVSET resistor network - optimizes gate drive strength and FET conduction loss without changing layout. |
| Input overvoltage lockout (OVLO) | 1.2V threshold on OVLO pin - provides fail-safe protection against transients on high-voltage rails like 48V telecom or EV auxiliary systems. |
Applications
| Automotive Battery Management | Telecom 48V Intermediate Bus |
|---|---|
|
Use Scenario: Regulating 12V or 5V from 24V–72V vehicle battery under cold-crank (VIN down to ~6V) and load-dump (VIN up to 140V) conditions. IC Role / Device Role / Timing Role: High-voltage synchronous buck controller with 100% duty cycle and 40μA IQ, managing power conversion in ADAS ECUs and infotainment head units. Use Value: Maintains regulated output during engine start-up; low IQ extends parking mode battery life; robust UVLO/OVLO prevents damage during transients. |
Use Scenario: Converting 48V telecom backplane to 12V intermediate bus for downstream POL converters in base station RF modules. IC Role / Device Role / Timing Role: Primary step-down controller operating at 350kHz–850kHz, synchronized via PLLIN to reduce system-level EMI. Use Value: High efficiency (>95% at 10A) across wide load range; phase-lock capability enables interleaved multi-phase designs for higher current delivery. |
| Industrial IoT Sensor Hub | High-Voltage LED Driver Supply |
|
Use Scenario: Powering low-power microcontrollers, wireless radios, and analog front-ends from 24V or 48V factory floor power rails. IC Role / Device Role / Timing Role: Always-on buck controller with Burst Mode® operation and PGOOD monitoring for autonomous sensor nodes. Use Value: 40μA quiescent current enables multi-year battery life; PGOOD signal triggers wake-up events and validates supply health before data transmission. |
Use Scenario: Driving constant-current LED strings requiring 36V–60V output from 72V or 100V industrial lighting bus. IC Role / Device Role / Timing Role: Adjustable-output synchronous buck controller with precision 0.8V reference and current-sense interface for LED current regulation. Use Value: Output programmability (0.8–60V) supports diverse LED configurations; SENSE+/– differential sensing rejects common-mode noise in high-noise lighting environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3894IFE#PBF | Single-phase only; lacks phase-lock capability and CLKOUT; lower max frequency (600kHz); same 140V VIN, 40μA IQ, and 38-TSSOP package. | Suitable for cost-sensitive single-rail designs where synchronization is unnecessary. | Select when multi-phase coordination is not required and BOM simplification is prioritized over frequency flexibility. |
| MPQ4333HG-AEC1-P | Automotive-grade (AEC-Q100); 100V max VIN; integrated MOSFETs; fixed 5V/3.3V outputs only; no programmable gate drive or OPTI-LOOP®. | Targeted at ASIL-B automotive subsystems with lower voltage requirements and space-constrained layouts. | Choose for production automotive modules needing qualification and integration, but not for >100V or fully adjustable designs. |
Compared with LTC3894IFE#PBF and MPQ4333HG-AEC1-P, the LTC3895IFE#PBF uniquely combines 140V operation, phase-lockable 850kHz frequency, OPTI-LOOP® compensation, and programmable gate drive - making it optimal for high-performance, flexible, and EMI-sensitive industrial and telecom power systems.
Availability
LTC3895IFE#PBF is available at Aetrix Electronics and suitable for automotive battery management, telecom 48V intermediate bus, and industrial IoT sensor hub applications requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to +125°C junction temperature.
Supply support for LTC3895IFE#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous testing and automotive/industrial qualification standards.
The LTC3895IFE#PBF belongs to Linear's high-voltage controller family designed specifically for rugged, wide-input industrial and automotive power conversion - emphasizing reliability under extreme voltage transients, low quiescent power, and flexible system integration.
FAQ
What is the maximum input voltage rating for the LTC3895IFE#PBF?
The LTC3895IFE#PBF has an absolute maximum input voltage (VIN) rating of 150V, with a recommended operating range of 4V to 140V. This enables reliable operation in harsh environments such as automotive cold-crank (down to ~6V) and load-dump (up to 140V) conditions. Exceeding 150V risks permanent device damage per Absolute Maximum Ratings.
How does the LTC3895IFE#PBF achieve 100% duty cycle operation?
The LTC3895IFE#PBF achieves 100% duty cycle using its integrated charge pump, enabled via the CPUMP_EN pin. When CPUMP_EN is tied to INTVCC, the charge pump generates boosted voltage for the top-gate driver, allowing continuous conduction during dropout. This is essential for maintaining regulation when VIN approaches VOUT - a key requirement in automotive and battery-powered systems.
Can the LTC3895IFE#PBF be synchronized to an external clock source?
Yes, the LTC3895IFE#PBF supports external synchronization via the PLLIN pin. Applying a clean clock signal (75–850kHz) to PLLIN locks the internal oscillator's rising TG edge to the external clock's rising edge. The device retains its configured light-load mode (Burst, pulse-skip, or forced continuous) during synchronization, enabling deterministic multi-phase timing in complex power architectures.
What are the supported output voltage configurations for the LTC3895IFE#PBF?
The LTC3895IFE#PBF supports three output voltage configurations: adjustable (0.8V–60V) via external resistor divider on VFB with VPRG floating; fixed 5V with VPRG tied to INTVCC; and fixed 3.3V with VPRG tied to GND. All configurations use the same precision 0.8V internal reference, ensuring consistent accuracy regardless of selection method.
Does the LTC3895IFE#PBF include built-in protection features?
Yes, the LTC3895IFE#PBF integrates multiple protections: input overvoltage lockout (OVLO) triggered at 1.2V on the OVLO pin; programmable undervoltage lockout (UVLO) for DRVCC with thresholds selectable via DRVUV; power-good (PGOOD) monitoring with ±10% tolerance; and foldback current limiting set by ILIM pin (50/75/100mV). These operate independently of external components for robust system-level safety.
LTC3895IFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) 31 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):
- 4V ~ 140V
- Frequency - Switching:
- 50kHz ~ 900kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Phase Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LTC3895IFE#PBF FAQ
1.How can I place an order for LTC3895IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3895IFE#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 LTC3895IFE#PBF reliable?
The price and inventory of LTC3895IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3895IFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3895IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3895IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3895IFE#PBF?
LTC3895IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3895IFE#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 LTC3895IFE#PBF?
For technical support, including LTC3895IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3895IFE#PBF requirements.
6.How does Aetrix verify that LTC3895IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3895IFE#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 LTC3895IFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3895IFE#PBF?
All LTC3895IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3895IFE#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 LTC3895IFE#PBF part is unused and in its original packaging.
Return procedure for LTC3895IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3895IFE#PBF 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…
