My Inquiry
My Account
Analog Devices Inc. LTC7862HUFD#PBF
- Part No.:
- LTC7862HUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC7862HUFD#PBF.pdf
- Description:
- 140V HIGH EFFICIENCY SWITCHING S
- Quantity:
- Payment:
- Shipping:
Inventory:9,379
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC7862HUFD#PBF from Analog Devices is a high-efficiency switching surge stopper controller that protects downstream loads from input overvoltage transients up to 140V while maintaining regulated output clamping (up to 60V), adjustable overcurrent protection, and 100% duty-cycle pass-through operation during normal conditions. It drives two external N-channel MOSFETs in buck configuration during faults and delivers 28V/20A output with 100V overvoltage protection in automotive ISO7637 and MIL-STD-1275 applications.
For engineers reviewing the LTC7862HUFD#PBF datasheet, LTC7862HUFD#PBF pinout, LTC7862HUFD#PBF application, or LTC7862HUFD#PBF equivalent, key selection criteria include its 4V–140V input range, programmable fault timer, RSENSE/DCR current sensing, adjustable 50kHz–900kHz switching frequency, and –40°C to 150°C junction temperature rating in the 4mm × 5mm QFN package.
Technical Context
The LTC7862HUFD#PBF implements a peak-current-mode synchronous buck controller architecture with fast comparator-based overcurrent limiting and dual-mode operation: dropout (100% duty cycle) for normal pass-through and active switching regulation during overvoltage, overcurrent, or startup events. Its internal charge pump supports high-side gate drive up to 150V, and the TMR pin controls both switching duration and cooldown timing via an external capacitor.
It features independent LDOs for DRVCC (6V or 9V selectable via DRVUV pin) and INTVCC (5V), programmable UVLO/OVLO thresholds, open-drain WARNB fault indicator, and soft-start with adjustable ramp rate. The device operates across –40°C to 150°C junction temperature and uses differential SENSE+ / SENSE– inputs for accurate current sensing with ±1µA bias current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V - supports wide industrial/automotive bus voltages including ISO7637 load dump and MIL-STD-1275 surges. |
| Output Clamp Voltage | Up to 60V - user-programmable via feedback divider; typical 28V/34V clamp used in 28V vehicle systems. |
| Switching Frequency | 50kHz to 900kHz - adjustable via resistor on FREQ pin; enables optimization of size, efficiency, and EMI. |
| Operating Temperature | –40°C to 150°C (junction) - H-grade qualification ensures reliability in under-hood and avionic environments. |
| Current Sensing | RSENSE or inductor DCR - differential inputs (SENSE+/SENSE–) with 43–57mV max threshold enable precise overcurrent detection. |
| Fault Timer Control | Programmable via TMR pin capacitor - sets switching-on time per fault (55ms/µF typ) and cooldown period (1700ms/µF). |
| Gate Drive Capability | TG/BG drivers with 1.0Ω pull-down / 2.2Ω pull-up - supports fast switching of high-current N-MOSFETs with <25ns transition times. |
Pinout & Package
Package: 20-lead (4mm × 5mm) plastic QFN with exposed thermal pad (Pin 21 = GND). Requires soldering of exposed pad to PCB ground for rated electrical performance and thermal dissipation (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE+ | Differential current sense positive input | Connects to high-side of current sense resistor; referenced to SENSE– to set ITRIP with ITH voltage. |
| SENSE– | Differential current sense negative input | Bias current source (900µA at 28V); powers current comparator when > INTVCC; sets common-mode range. |
| SS | Soft-start control input | Internal 10µA pull-up charges external capacitor; regulates VFB to min(0.8V, VSS) during startup/retry. |
| VFB | Feedback voltage input | Compares against 0.792–0.812V reference; sets output clamp voltage via external resistor divider. |
| ITH | Error amplifier output & compensation node | Sets current limit threshold; higher voltage increases trip point; used for loop compensation. |
| TMR | Fault timer programming input | External capacitor sets switching duration (55ms/µF) and cooldown time (1700ms/µF); internal current sources define thresholds. |
| FREQ | Oscillator frequency control | 20µA pull-up enables resistor-programmed frequency (50–900kHz); tied to GND/INTVCC for fixed 350/535kHz. |
| WARNB | Open-drain fault warning output | Pulls low during switching, shutdown, or cooldown; high-impedance 60µs after entering dropout; 10Ω typical pull-down. |
| TG | Top gate driver output | Floating high-side driver (SW to BOOST swing); drives MTOP MOSFET gate; supports 150V bootstrap operation. |
| SW | Switch node connection | Connects to inductor and MOSFET source; critical for layout; ties BOOST capacitor and bootstrap diode. |
| OVLO | Overvoltage lockout input | Logic-high (>1.2V) disables switching; maintains DRVCC/INTVCC regulation; connect to GND if unused. |
| INTVCC | Internal 5V LDO output | Powers analog/digital circuitry; requires 0.1µF ceramic bypass close to pin; not for external loading. |
| DRVCC | Gate driver supply output | 6V or 9V LDO output (set by DRVUV); powers TG/BG drivers; needs ≥4.7µF low-ESR ceramic decoupling. |
| RUN | Enable/disable control input | Below 1.12V disables controller; below 0.7V forces full shutdown (10µA IQ); must not be left floating. |
| EXTVCC | External gate driver supply input | Enables alternate DRVCC sourcing from external supply (4.7–13V); switchover threshold depends on DRVUV setting. |
| VIN | Main input supply | Primary power input (4–140V); connects to input capacitor; absolute max 150V. |
| GND | Signal and power ground | All GND pins plus exposed pad (Pin 21) must be connected to system ground plane for thermal and noise integrity. |
| BOOST | Bootstrap supply for top gate driver | Capacitor between BOOST and SW provides floating supply for TG; voltage ≈ DRVCC + VSW. |
| BG | Bottom gate driver output | Ground-referenced driver for MBOT MOSFET; 0–DRVCC swing; complements TG in synchronous buck operation. |
| DRVUV | DRVCC regulation and UVLO select | Tie to GND for 6V DRVCC/low UVLO (4.2V); tie to INTVCC for 9V DRVCC/high UVLO (7.8V); determines EXTVCC switchover. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle pass-through mode | Minimizes conduction loss during normal operation; insertion loss dominated by MOSFET RDS(on), not IC quiescent drop. |
| Programmable fault timer with cooldown | Prevents thermal runaway during sustained overvoltage; allows component sizing optimized for pass-through, not worst-case switching. |
| Dual current sensing options | Supports precision RSENSE or cost-effective inductor DCR sensing - reduces BOM count and improves accuracy vs. single-point sensing. |
| Adjustable input UVLO/OVLO thresholds | Configurable via resistive dividers on RUN and OVLO pins - enables custom turn-on behavior and surge rejection without external comparators. |
| Integrated charge pump for high-side drive | Eliminates need for external bootstrap diode and capacitor; supports continuous 150V operation with robust gate drive up to 150V. |
| Open-drain WARNB fault indicator | Provides system-level visibility into fault state (switching, cooldown, shutdown); simplifies host MCU monitoring and logging. |
Applications
| Automotive Load Dump Protection | ISO 7637-2 Compliant Vehicle Power |
|---|---|
Use Scenario: Protecting infotainment ECUs and ADAS modules from 100V/400ms load dump transients on 12V/24V vehicle buses. IC Role / Device Role / Timing Role: Acts as pre-regulator clamping output to 28V during surge; switches only during transient, remains in 100% duty-cycle pass-through otherwise. Use Value: Enables use of standard 30V-rated downstream components instead of 100V-rated parts, reducing cost and board area. | Use Scenario: Maintaining stable 28V supply to telematics gateways during ISO 7637-2 Pulse 5a (load dump) and Pulse 4 (alternator ripple) events. IC Role / Device Role / Timing Role: Regulates output to 34V clamp during >34V input; passes through input when VIN < 34V; uses TMR to limit switching duration to 100ms. Use Value: Achieves >95% efficiency in pass-through mode and >90% during clamping - far exceeding linear surge stoppers' thermal limits. |
| MIL-STD-1275E Military Power | Industrial DC Power Distribution |
Use Scenario: Securing mission-critical avionics and radar subsystems against 100V/500ms surges on 28V aircraft buses per MIL-STD-1275E. IC Role / Device Role / Timing Role: Controls external Infineon BSC035N10NS5 MOSFETs to regulate output during surge; enters dropout when input returns to safe range. Use Value: H-grade (–40°C to 150°C) operation ensures reliability in uncooled avionics bays; exposed-pad QFN aids thermal management. | Use Scenario: Protecting PLC I/O modules and motor drives from 140V lightning-induced surges on factory 48V DC distribution lines. IC Role / Device Role / Timing Role: Clamps output to 48V using adjustable VFB divider; senses overcurrent via DCR to avoid shunt resistor losses. Use Value: Supports 20A continuous output with minimal heat rise in pass-through mode - eliminates need for heatsinks in space-constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching surge stopper applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365HDE#PBF | Linear surge stopper; 4–40V input; integrated MOSFET; no switching; max 12A output. | Lower power, simpler layout, no inductor; limited to <40V input and lower current; no programmable timer or DCR sensing. | Select when input voltage stays ≤40V and thermal budget prohibits switching complexity. |
| MAX16050ATJ+T | Switching surge protector; 4.5–60V input; integrated power stage; 5A max; fixed 300kHz freq. | Lower voltage range, lower current, no external MOSFET flexibility; lacks TMR cooldown, DCR sensing, or H-temp grade. | Select for compact 5A solutions where 60V max input suffices and external MOSFET control is unnecessary. |
Compared with LTC4365HDE#PBF and MAX16050ATJ+T, the LTC7862HUFD#PBF uniquely supports 140V input, 20A output with external MOSFETs, programmable fault timing, and –40°C to 150°C operation - making it the only option for high-power, high-voltage, high-reliability surge protection in automotive and military systems.
Availability
LTC7862HUFD#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, ISO7637-compliant vehicle power systems, MIL-STD-1275E military power conditioning, and industrial DC distribution requiring stable component supply across extended temperature and high-reliability requirements.
Supply support for LTC7862HUFD#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and defense markets.
The LTC7862HUFD#PBF belongs to Analog Devices' Power by Linear™ surge protection controller family, designed specifically for high-efficiency, high-voltage transient suppression in harsh-environment applications where linear regulators fail thermally.
FAQ
What is the maximum input voltage the LTC7862HUFD#PBF can withstand?
The LTC7862HUFD#PBF has an absolute maximum input voltage rating of 150V, with a specified operating input range of 4V to 140V. This makes it suitable for demanding applications such as MIL-STD-1275E (100V surge) and ISO 7637-2 (100V load dump), where transient protection beyond standard 60V controllers is required. Operation above 140V is outside specification and may compromise reliability.
How does the LTC7862HUFD#PBF handle overcurrent events?
The LTC7862HUFD#PBF detects overcurrent using either an external sense resistor (RSENSE) or inductor DCR, with differential SENSE+ and SENSE– inputs. It compares sensed voltage against a threshold set by the ITH voltage (43–57mV typical), triggering switching regulation to clamp output current. If the fault persists beyond the TMR-set duration, it enters cooldown before retrying - preventing thermal damage to external MOSFETs and inductors.
Can the LTC7862HUFD#PBF operate without external MOSFETs?
No, the LTC7862HUFD#PBF is a controller-only IC and requires two external N-channel MOSFETs - one high-side (MTOP) and one synchronous low-side (MBOT) - to implement the buck regulator during surge events. It does not integrate power switches. Typical implementations use Infineon BSC035N10NS5 or equivalent 100V-rated devices, as validated in Analog Devices' reference designs.
What is the purpose of the TMR pin on the LTC7862HUFD#PBF?
The TMR pin on the LTC7862HUFD#PBF programs the fault timer using an external capacitor to ground. It defines three timing intervals: (1) maximum allowed switching duration per fault (55ms/µF), (2) retry period after fault clearance (50ms/µF), and (3) mandatory cooldown time before restart (1700ms/µF). This prevents thermal saturation during sustained overvoltage or overcurrent, enabling smaller, more cost-effective thermal design.
Does the LTC7862HUFD#PBF support both RSENSE and DCR current sensing?
Yes, the LTC7862HUFD#PBF supports both RSENSE and inductor DCR current sensing via its differential SENSE+ and SENSE– inputs. RSENSE offers higher accuracy and faster response; DCR sensing eliminates the shunt resistor, reducing power loss and BOM cost. The device's 900µA bias current on SENSE– enables reliable DCR operation even at low output voltages, and the 43–57mV current sense threshold is compatible with typical DCR values (e.g., 1–5mΩ).
LTC7862HUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 20-WFQFN Exposed Pad
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Voltage - Clamping:
- Adjustable
- Technology:
- External Switch
- Number of Circuits:
- 1
- Applications:
- -
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x5)
LTC7862HUFD#PBF FAQ
1.How can I place an order for LTC7862HUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7862HUFD#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 LTC7862HUFD#PBF reliable?
The price and inventory of LTC7862HUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7862HUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC7862HUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7862HUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7862HUFD#PBF?
LTC7862HUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7862HUFD#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 LTC7862HUFD#PBF?
For technical support, including LTC7862HUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7862HUFD#PBF requirements.
6.How does Aetrix verify that LTC7862HUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7862HUFD#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 LTC7862HUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC7862HUFD#PBF?
All LTC7862HUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7862HUFD#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 LTC7862HUFD#PBF part is unused and in its original packaging.
Return procedure for LTC7862HUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC7862HUFD#PBF Tags
-
TVS3300DRVR
Texas Instruments
-
TCPP01-M12
STMicroelectronics
-
TPD4S214YFFR
Texas Instruments
-
TPD6S300ARUKR
Texas Instruments
-
TBU-CA085-300-WH
Bourns Inc.
-
TBU-CA065-500-WH
Bourns Inc.
-
TBU-CA040-100-WH
Bourns Inc.
-
TBU-CA085-500-WH
Bourns Inc.
-
TBU-CA085-200-WH
Bourns Inc.
-
NX20P0408UKZ
NXP Semiconductors
-
TBU-CA085-100-WH
Bourns Inc.
-
TBU-CA050-300-WH
Bourns Inc.
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…
