My Inquiry
My Account
Analog Devices Inc. LTC3895EFE#PBF
- Part No.:
- LTC3895EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Datasheet:
-
LTC3895EFE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,002
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3895EFE#PBF from Analog Devices (formerly Linear Technology) is a high-voltage synchronous step-down DC/DC controller driving all-N-channel MOSFETs with input voltage support up to 140V, 0.8V–60V programmable output, and 40μA no-load quiescent current. It features OPTI-LOOP® compensation, phase-lockable 75kHz–850kHz operation, and integrated charge pump enabling 100% duty cycle for automotive battery-supplied industrial power systems.
For engineers reviewing the LTC3895EFE#PBF datasheet, LTC3895EFE#PBF pinout, LTC3895EFE#PBF application, or LTC3895EFE#PBF equivalent, key selection criteria include high-input-voltage capability (up to 140V), low-IQ for battery longevity, gate drive programmability (5V–10V), and robust thermal performance in the 38-lead TSSOP package with exposed pad.
Technical Context
The LTC3895EFE#PBF implements a constant-frequency current-mode architecture with dual gate drivers (TG/BG), integrated charge pump for high-side bootstrap, and three independent LDO paths (VIN-, NDRV-, and EXTVCC-derived) for DRVCC regulation. Its error amplifier (ITH) controls peak-current limiting via SENSE+/SENSE– differential sensing, while OPTI-LOOP® allows dynamic loop compensation across wide output capacitance and ESR ranges.
It supports multiple light-load operating modes-Burst Mode®, pulse-skipping, and forced continuous-selected via MODE pin voltage, and includes precision 0.8V reference, power-good monitoring (PGOOD), programmable input overvoltage lockout (OVLO), and soft-start (SS) with regulator shutdown (REGSD) functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V - enables direct connection to 48V telecom, 72V industrial, or 120V battery stacks without pre-regulation. |
| Output Voltage Range | 0.8V to 60V - supports both logic rails (3.3V/5V fixed via VPRG) and intermediate bus voltages (e.g., 12V, 24V, 48V). |
| No-Load Quiescent Current | 40μA - extends runtime in always-on battery-powered systems such as remote sensors or backup power modules. |
| Switching Frequency Range | 75kHz to 850kHz - allows optimization of size (higher f) vs. efficiency (lower f) and supports phase synchronization across multi-phase designs. |
| Gate Drive Voltage | Programmable 5V–10V (OPTI-DRIVE™) - matches threshold and RDS(on) requirements of logic-level or standard-level N-MOSFETs for peak efficiency. |
| Duty Cycle Capability | 100% - maintains regulation during input dropout (e.g., cold-crank in automotive), enabled by internal charge pump when CPUMP_EN = INTVCC. |
| Reference Voltage Accuracy | ±1% over –40°C to 125°C - ensures stable output under wide ambient and load conditions without external trimming. |
Pinout & Package
Package: 38-lead plastic TSSOP (FE package), exposed pad (Pin 39) soldered to PCB ground for thermal and electrical integrity (θJA = 28°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (30) | Main input supply rail | Accepts 4V–140V; powers internal LDOs and supplies top/bottom gate drivers via charge pump or LDO paths. |
| TG (20) | Top gate driver output | Floating high-side driver with swing = DRVCC superimposed on SW node; drives N-MOSFET gate referenced to switch node. |
| BG (24) | Bottom gate driver output | Ground-referenced driver (0V to DRVCC); synchronously switches bottom N-MOSFET to complete buck power stage. |
| SW (21) | Switch node | Connection point between TG, BG, and inductor; critical for layout due to high dV/dt and EMI sensitivity. |
| BOOST (22) | Bootstrap supply node | Capacitor-connected to SW; provides floating bias for TG driver; voltage swings from ~DRVCC to (VIN + DRVCC). |
| DRVCC (26) | Gate driver supply rail | Regulated output (5V–10V) powering TG/BG drivers; sourced from VIN, NDRV, or EXTVCC LDOs depending on configuration. |
| SENSE+ / SENSE– (3/4) | Differential current sense inputs | Measure voltage across external sense resistor; set current limit threshold with ±1µA input bias and selectable ILIM levels (50/75/100mV). |
| VFB (6) | Feedback input | Compares against 0.8V reference; regulates output via external resistor divider or fixed 3.3V/5V when VPRG tied to GND/INTVCC. |
| PGOOD (14) | Open-drain status output | Asserts low when VFB deviates >±10% from setpoint; used for system sequencing and fault reporting. |
| RUN (34) | Enable/shutdown control | Logic-high (>1.2V) enables operation; <0.7V forces full shutdown (IQ = 10μA); supports controlled power-up sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows single-pole compensation network tuning across wide output capacitor types (ceramic, polymer, electrolytic) and ESR values without stability risk. |
| Integrated Charge Pump | Eliminates need for external bootstrap diode and enables true 100% duty cycle operation during input voltage dropout. |
| Triple-Source DRVCC Regulation | Supports flexible power architecture: internal VIN LDO, external NMOS-based NDRV LDO, or dedicated EXTVCC input - improves efficiency and thermal distribution. |
| Programmable Light-Load Modes | Selectable Burst Mode®, pulse-skipping, or forced continuous via MODE pin voltage - balances efficiency vs. output ripple for varying load profiles. |
| High-Voltage Pin Robustness | 150V absolute max rating on VIN, BOOST, SW, RUN, and OVLO pins - withstands load dump transients in automotive and industrial environments. |
Applications
| Automotive Power Management | Industrial Telecom Power |
|---|---|
Use Scenario: Regulating 12V rail from 24V/48V vehicle battery under cold-crank (down to 3.5V) and load-dump (up to 120V) conditions. IC Role / Device Role / Timing Role: High-voltage synchronous buck controller managing gate timing, current sensing, and protection functions for N-MOSFET power stage. Use Value: 40μA IQ preserves battery life during sleep; 100% duty cycle sustains output during cranking; 150V pin rating survives ISO 7637-2 transients. | Use Scenario: Generating stable 48V intermediate bus from 72V–100V telecom rectifier output in distributed power architecture. IC Role / Device Role / Timing Role: Primary DC/DC controller coordinating switching frequency, phase alignment (via PLLIN), and current-limit response in high-efficiency front-end converter. Use Value: Phase-lockable 850kHz operation reduces magnetics size; programmable 5V–10V gate drive optimizes FET conduction loss; PGOOD enables hot-swap sequencing. |
| High-Voltage Battery Systems | Medical Diagnostic Equipment |
Use Scenario: Powering FPGA, ADC, and analog front-end from 60V Li-ion battery pack in portable ultrasound or defibrillator units. IC Role / Device Role / Timing Role: Precision-controlled step-down regulator delivering low-noise 1.2V/3.3V/5V rails with tight load/line regulation and fast transient response. Use Value: 0.8V ±1% reference ensures accurate voltage scaling; OPTI-LOOP® maintains stability with ceramic output caps; low 40μA IQ extends field-use time. | Use Scenario: Supplying isolated 5V and 12V rails for imaging sensor bias, data acquisition, and microcontroller subsystems in MRI-compatible equipment. IC Role / Device Role / Timing Role: Non-isolated primary controller providing clean, well-regulated outputs with minimal EMI impact on sensitive analog circuits. Use Value: Selectable light-load modes reduce audible noise and ripple; EXTVCC option decouples gate drive supply from noisy main rail; 38-lead TSSOP aids thermal management in compact enclosures. |
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 |
|---|---|---|---|
| LTC3895IFE#PBF | Identical functionality and pinout; rated for –40°C to 125°C junction temperature (same as E-grade). | No functional difference; identical qualification level per datasheet - only marking and traceability differ. | Select when requiring full industrial temperature range validation documentation or specific lot traceability. |
| LTC3895HFE#PBF | Same silicon and features; extended junction temperature rating up to 150°C (vs. 125°C for E/I-grade). | Suitable for under-hood automotive or high-ambient industrial environments where thermal derating is critical. | Choose for applications exceeding 125°C ambient or requiring higher long-term reliability margin at elevated temperatures. |
Compared with LTC3895EFE#PBF, the I-grade offers identical electrical specs but enhanced test coverage across temperature, while the H-grade adds 25°C higher max junction temperature - both retain full pin compatibility, feature set, and design-in flexibility without layout changes.
Availability
LTC3895EFE#PBF is available at Aetrix Electronics and suitable for automotive power management, industrial telecom power, and high-voltage battery-operated systems requiring stable component supply, long-lifecycle assurance, and consistent parametric performance across production batches.
Supply support for LTC3895EFE#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 analog IC portfolio, including precision power management solutions trusted in mission-critical applications.
The LTC3895EFE#PBF belongs to Linear's high-voltage DC/DC controller product line, designed specifically for demanding industrial, automotive, and telecom power conversion where input voltage extremes, low quiescent current, and robust protection are mandatory.
FAQ
What is the maximum input voltage the LTC3895EFE#PBF can handle?
The LTC3895EFE#PBF has an absolute maximum input voltage rating of 150V on the VIN pin, with guaranteed operation up to 140V. This allows direct interface with 48V, 72V, and 100V battery systems and telecom rectifiers while surviving transient overvoltages common in automotive and industrial environments.
Does the LTC3895EFE#PBF support 100% duty cycle operation?
Yes, the LTC3895EFE#PBF supports true 100% duty cycle operation when the CPUMP_EN pin is tied to INTVCC, activating the internal charge pump to sustain the high-side gate drive during input voltage dropout - a critical capability for automotive cold-crank scenarios.
How is the output voltage programmed on the LTC3895EFE#PBF?
The LTC3895EFE#PBF supports three output voltage configurations: adjustable (0.8V–60V) using external resistors on VFB with VPRG floating; fixed 5V with VPRG tied to INTVCC; or fixed 3.3V with VPRG tied to GND - enabling rapid design reuse across multiple voltage rails.
What gate drive voltage options does the LTC3895EFE#PBF provide?
The LTC3895EFE#PBF offers programmable gate drive voltage from 5V to 10V via the DRVSET pin, using either direct connection (GND = 6.0V, INTVCC = 10V) or resistor dividers (e.g., 50kΩ = 5.0V, 70kΩ = 6.4–7.0V, 90kΩ = 9.0V), optimizing FET selection for conduction loss and switching speed.
Can the LTC3895EFE#PBF synchronize to an external clock?
Yes, the LTC3895EFE#PBF accepts external synchronization via the PLLIN pin, locking its switching frequency (75kHz–850kHz) to an external clock source - essential for reducing beat frequencies and EMI in multi-phase or system-level synchronized power architectures.
LTC3895EFE#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
LTC3895EFE#PBF FAQ
1.How can I place an order for LTC3895EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3895EFE#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 LTC3895EFE#PBF reliable?
The price and inventory of LTC3895EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3895EFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3895EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3895EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3895EFE#PBF?
LTC3895EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3895EFE#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 LTC3895EFE#PBF?
For technical support, including LTC3895EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3895EFE#PBF requirements.
6.How does Aetrix verify that LTC3895EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3895EFE#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 LTC3895EFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3895EFE#PBF?
All LTC3895EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3895EFE#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 LTC3895EFE#PBF part is unused and in its original packaging.
Return procedure for LTC3895EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3895EFE#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…
