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Analog Devices Inc. LTC3895IFE#TRPBF
- Part No.:
- LTC3895IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Datasheet:
-
LTC3895IFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,260
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Product details
Overview
LTC3895IFE#TRPBF 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 40μA no-load quiescent current, phase-lockable switching frequency up to 850kHz, and integrated charge pump enabling 100% duty cycle operation - used in industrial power supplies requiring wide VIN range and high efficiency at light loads.
For engineers reviewing the LTC3895IFE#TRPBF datasheet, LTC3895IFE#TRPBF pinout, LTC3895IFE#TRPBF application, or LTC3895IFE#TRPBF equivalent, key selection criteria include its 140V max input rating, programmable gate drive (5–10V), OPTI-LOOP® compensation, precision 0.8V reference, and automotive-grade –40°C to 125°C operating junction temperature.
Technical Context
The LTC3895IFE#TRPBF implements a constant-frequency current-mode control architecture with internal transconductance error amplifier (gm = 2.2 mmho) and selectable light-load modes (Burst Mode®, pulse-skipping, or forced continuous). Its dual LDO structure supports DRVCC regulation via internal VIN, external EXTVCC, or NDRV-driven NMOS pass device - enabling flexible power sourcing for gate drivers under varying input conditions.
It integrates a phase-locked loop (PLLIN) for synchronization across multiple phases, programmable UVLO thresholds (via DRVUV), and overvoltage lockout (OVLO) with soft-start reset. The controller uses differential current sensing (SENSE+/SENSE–) with three selectable maximum sense thresholds (43mV/75mV/90mV) determined by ILIM pin state, and supports 100% duty cycle via CPUMP_EN-enabled charge pump.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V - enables direct conversion from 48V telecom, 72V battery, or 100V industrial bus without pre-regulation. |
| Output Voltage Range | 0.8V to 60V - supports both low-voltage logic rails and intermediate bus voltages like 12V, 24V, or 48V outputs. |
| 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 (phase-lockable) - allows EMI optimization and inductor size reduction while maintaining stability across load and line variations. |
| Gate Drive Voltage | Programmable 5V–10V (OPTI-DRIVE™) - matches logic-level or standard-level N-MOSFETs to minimize conduction loss and maximize efficiency. |
| Duty Cycle Capability | 100% with CPUMP_EN enabled - supports dropout operation where VIN ≈ VOUT, critical for high-VIN/low-VOUT applications like 140V-to-12V conversion. |
| Reference Voltage Accuracy | ±1% over –40°C to 125°C - ensures precise output regulation across automotive and industrial temperature ranges. |
Pinout & Package
Package: 38-lead plastic TSSOP (FE package), exposed pad (Pin 39) soldered to PCB ground for thermal and electrical performance. Junction-to-ambient θJA = 28°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (30) | Main input supply connection | Accepts 4V–140V input; requires local ceramic bypass capacitor to GND for noise suppression and transient response. |
| TG (20) | Top gate driver output | Floating high-side driver delivering DRVCC-referenced voltage swing to top N-MOSFET gate; supports bootstrap or charge-pump operation. |
| BG (24) | Bottom gate driver output | Ground-referenced driver for synchronous N-MOSFET; complements TG to enable efficient synchronous rectification. |
| SENSE+ / SENSE– (3/4) | Differential current sense inputs | Measure voltage across external RSENSE to set peak current limit; support three programmable thresholds (43/75/90mV) via ILIM pin. |
| VFB (6) | Feedback input | Compares output voltage against 0.8V reference; accepts remote sensing or fixed 3.3V/5V programming via VPRG pin configuration. |
| PGOOD (14) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from setpoint - provides system-level fault signaling for downstream sequencing or monitoring. |
| RUN (34) | Enable/shutdown control | Logic-high (>1.12V) enables operation; <0.7V forces full shutdown (IQ = 10μA); tied to VIN for always-on use. |
| CPUMP_EN (10) | Charge pump enable | High enables internal charge pump for 100% duty cycle; low disables pump for 99% max duty cycle with boost refresh. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows stable loop response across wide range of output capacitance (10µF–1000µF) and ESR values without external compensation network redesign. |
| Integrated Charge Pump | Eliminates need for external bootstrap diode and enables true 100% duty cycle operation during input voltage dropout conditions. |
| Three-Mode Light-Load Control | Selectable Burst Mode®, pulse-skipping, or forced continuous operation - optimizes efficiency vs. output ripple trade-off per application requirement. |
| Programmable DRVCC Regulation | DRVSET pin sets gate driver supply from 5V to 10V using resistor divider - matches FET threshold and RDS(on) for lowest conduction loss. |
| Multi-Source DRVCC Architecture | DRVCC can be powered from internal VIN LDO, external EXTVCC LDO, or NDRV-driven NMOS pass device - improves efficiency and thermal management flexibility. |
Applications
| Industrial Power Supply | Automotive Battery Management |
|---|---|
Use Scenario: 140V input from industrial 3-phase rectified bus converted to regulated 24V for PLC I/O modules and fieldbus interfaces. IC Role / Device Role / Timing Role: Primary high-voltage step-down controller managing synchronous MOSFET switching, current limiting, and power-good signaling. Use Value: 40μA quiescent current minimizes standby loss; 140V input rating avoids bulky pre-regulators; 100% duty cycle maintains regulation during brownouts. | Use Scenario: 72V lithium-titanate or lead-acid traction battery powering 12V auxiliary systems in electric commercial vehicles. IC Role / Device Role / Timing Role: High-efficiency buck controller with programmable UVLO and OVLO for safe battery discharge management and system protection. Use Value: Adjustable gate drive (5–10V) accommodates diverse MOSFET selections; –40°C to 125°C rating meets AEC-Q100 Grade 1 requirements. |
| Telecom Intermediate Bus Converter | High-Voltage IoT Sensor Node |
Use Scenario: Conversion of –48V telecom rectifier output (referred to chassis ground) to isolated +12V for baseband processing and RF front-end biasing. IC Role / Device Role / Timing Role: Non-isolated synchronous buck controller with phase-lockable frequency for synchronized multi-rail power delivery. Use Value: PLLIN input enables clock synchronization across multiple converters to reduce conducted EMI peaks; 850kHz max frequency shrinks magnetics size. | Use Scenario: Solar-charged 100V-capable supercapacitor bank powering ultra-low-power wireless sensor node with intermittent 3.3V MCU operation. IC Role / Device Role / Timing Role: Always-on buck controller with Burst Mode® and 40μA IQ, managing deep-sleep wake-up cycles and energy harvesting bursts. Use Value: 0.8V reference and OPTI-LOOP® ensure stable 3.3V output despite wide input variation (15V–100V); SS pin enables controlled soft-start during cold-start events. |
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#TRPBF | Single-output version without PGOOD, lower max frequency (600kHz), no EXTVCC LDO support. | Suitable for cost-sensitive designs where power-good monitoring and EXTVCC flexibility are not required. | Select LTC3894IFE#TRPBF only if PGOOD, EXTVCC capability, and >600kHz operation are unnecessary. |
| LM5164QPWPRQ1 | 42V max input, integrated high-side FET, no charge pump, fixed 0.8V reference, AEC-Q100 qualified. | Targeted at automotive 12V/24V systems; lacks 140V capability and programmable gate drive. | Choose LM5164QPWPRQ1 for automotive 24V applications needing integrated FET and AEC-Q100 compliance - not for >42V inputs. |
Compared with LTC3894IFE#TRPBF and LM5164QPWPRQ1, the LTC3895IFE#TRPBF uniquely combines 140V input tolerance, 100% duty cycle via charge pump, PGOOD output, and triple-source DRVCC regulation - making it optimal for industrial and telecom systems demanding wide VIN, high reliability, and flexible gate drive.
Availability
LTC3895IFE#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive battery management systems, and telecom intermediate bus converters requiring stable component supply, long-term lifecycle support, and guaranteed temperature-grade performance.
Supply support for LTC3895IFE#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 acquired Linear Technology in 2017 and continues its legacy of high-performance analog ICs for power management, signal conditioning, and timing.
The LTC3895 belongs to Linear's high-voltage DC/DC controller product line, designed specifically for rugged industrial, automotive, and telecom applications where wide input range, low quiescent current, and robust protection features are essential.
FAQ
What is the maximum input voltage rating for the LTC3895IFE#TRPBF?
The LTC3895IFE#TRPBF has an absolute maximum input voltage rating of 150V on the VIN pin, with a specified operating range of 4V to 140V. This allows direct interface with high-voltage sources such as 48V telecom rectifiers, 72V battery stacks, or 100V industrial buses without external pre-regulation stages. Operation above 140V is not recommended for reliable long-term performance.
Does the LTC3895IFE#TRPBF support 100% duty cycle operation, and how is it enabled?
Yes, the LTC3895IFE#TRPBF supports 100% duty cycle operation when the CPUMP_EN pin (Pin 10) is tied to INTVCC, enabling the internal charge pump that sustains the high-side gate drive during dropout conditions. With CPUMP_EN grounded, the device supports up to 99% duty cycle using boot-strap refresh. This feature is critical for applications where VIN may approach or equal VOUT, such as 140V-to-12V conversion during brownout events.
How does the LTC3895IFE#TRPBF achieve low quiescent current, and what is its typical value?
The LTC3895IFE#TRPBF achieves low quiescent current through optimized internal biasing and sleep-mode circuitry, delivering a typical no-load IQ of 40μA in Burst Mode® operation. In shutdown mode (RUN < 0.7V), IQ drops to 10μA. This enables extended battery life in always-on systems like remote telemetry nodes or backup power supervisors, especially when paired with its wide 4V–140V input range.
Can the LTC3895IFE#TRPBF generate a fixed 5V or 3.3V output without external resistors?
Yes, the LTC3895IFE#TRPBF can generate fixed 5V or 3.3V outputs without external feedback resistors by configuring the VPRG pin (Pin 2): tie VPRG to INTVCC for 5V output or to GND for 3.3V output. When VPRG is left floating, the output becomes adjustable from 0.8V to 60V using an external resistor divider on the VFB pin, regulating to the precision 0.8V internal reference.
What protection features are integrated into the LTC3895IFE#TRPBF?
The LTC3895IFE#TRPBF integrates input overvoltage lockout (OVLO), programmable undervoltage lockout (UVLO via DRVUV), power-good monitoring (PGOOD open-drain output), thermal shutdown, and foldback current limiting. Its differential current sense architecture with three ILIM-selectable thresholds (43mV/75mV/90mV) provides accurate, noise-immune overcurrent protection - essential for reliability in harsh industrial and automotive environments.
LTC3895IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) 31 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):
- 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#TRPBF FAQ
1.How can I place an order for LTC3895IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3895IFE#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 LTC3895IFE#TRPBF reliable?
The price and inventory of LTC3895IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3895IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3895IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3895IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3895IFE#TRPBF?
LTC3895IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3895IFE#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 LTC3895IFE#TRPBF?
For technical support, including LTC3895IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3895IFE#TRPBF requirements.
6.How does Aetrix verify that LTC3895IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3895IFE#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 LTC3895IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3895IFE#TRPBF?
All LTC3895IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3895IFE#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 LTC3895IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3895IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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