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Analog Devices Inc. LT4356HDE-2#PBF
- Part No.:
- LT4356HDE-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT4356HDE-2#PBF.pdf
- Description:
- IC SURGE STOPPER ADJ 12-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,283
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Product details
Overview
LT4356HDE-2#PBF from Analog Devices is a high-voltage surge stopper IC that regulates output during overvoltage transients (e.g., automotive load dump) by controlling an external N-channel MOSFET gate. It provides adjustable 1.25V FB-clamp voltage, 50mV overcurrent sense threshold, and operates from 4V to 80V input with –40°C to 125°C extended temperature rating. Used in battery-powered high-side switch systems requiring robust fault recovery.
For engineers reviewing the LT4356HDE-2#PBF datasheet, LT4356HDE-2#PBF pinout, LT4356HDE-2#PBF application, or LT4356HDE-2#PBF equivalent, key selection criteria include its 60µA shutdown current (vs. 7µA in -1 variant), auxiliary amplifier retention during shutdown, reverse input protection to –60V, and guaranteed operation at 125°C junction temperature.
Technical Context
The LT4356HDE-2#PBF implements dual-loop protection: a voltage amplifier servoing the FB pin to 1.25V during overvoltage events, and a current amplifier limiting VCC–VSNS to 50mV during overcurrent faults. Its fault timer uses a VDS-dependent current source (2µA to 260µA) charging the TMR capacitor - enabling adaptive MOSFET safe operating area (SOA) management.
Unlike the LT4356-1 variant, the LT4356HDE-2#PBF maintains auxiliary amplifier functionality and internal 1.25V reference during shutdown (60µA IQ), supporting undervoltage lockout or always-on regulator control. The SHDN pin withstands –60V to 100V, and GATE drive clamps to 14V above OUT with 150mA pull-down capability for fast MOSFET turn-off.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 80V input - supports cold-crank automotive operation and high-voltage industrial rails. |
| Overvoltage Clamp Threshold | 1.25V at FB pin - sets output clamp voltage via external resistor divider; enables precise, adjustable regulation. |
| Overcurrent Sense Threshold | 50mV across VCC–SNS - defines current limit point; allows scalable protection using low-value sense resistors. |
| Shutdown Quiescent Current | 60µA - retains auxiliary amplifier and reference during shutdown, enabling UVLO or bias supply functions. |
| Temperature Range | –40°C to 125°C (H-grade) - qualified for under-hood automotive and harsh industrial environments. |
| Reverse Input Rating | –60V on VCC/SHDN/SNS - enables reverse-battery protection without external diodes. |
| Fault Timer Current Range | 2µA to 260µA (VDS-dependent) - dynamically adjusts fault timeout based on MOSFET stress, optimizing SOA usage. |
Pinout & Package
LT4356HDE-2#PBF is housed in a 12-lead (4mm × 3mm) plastic DFN package with exposed pad (Pin 13), rated for 125°C maximum junction temperature and θJA = 43°C/W. The exposed pad may be left unconnected or tied to PCB ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Auxiliary amplifier non-inverting input | Accepts external voltage for level detection or linear regulator control; clamped to 7V max. |
| AOUT | Auxiliary amplifier open-collector output | Sinks up to 2mA from 80V; drives LEDs, optocouplers, or PNP pass transistors. |
| GND | Device ground reference | Common return for internal circuitry and external feedback/sense paths. |
| EN | Open-collector enable indicator | High-impedance when MOSFET is fully on (VOUT > VCC – 0.7V); latched until reset. |
| FLT | Open-collector fault warning output | Pulls low at TMR = 1.25V (early warning); sinks up to 3mA from 80V. |
| SHDN | Shutdown control input | TTL-compatible; pulls down to <0.4V for shutdown; withstands –60V to 100V. |
| TMR | Fault timer capacitor connection | Charged by VDS-scaled current; thresholds at 1.25V (FLT), 1.35V (GATE off), 0.5V (retry). |
| FB | Voltage regulation feedback input | Servo point for 1.25V reference; connects to resistive divider from OUT to GND. |
| OUT | MOSFET source voltage sense | Senses VOUT to enable EN and set TMR charging current; clamped to VCC – 0.7V. |
| GATE | N-MOSFET gate driver output | Charge-pump driven; clamped to VOUT + 14V; 150mA pull-down for fast turn-off. |
| SNS | Current sense input | Monitors VCC–VSNS; internal amp limits differential to 50mV for overcurrent protection. |
| VCC | Main supply input | 4V–80V operation; tolerates –60V reverse bias; powers all internal blocks. |
Key Features
| Feature | Design Value |
|---|---|
| VDS-adaptive fault timer | Timer current scales from 2µA to 260µA with MOSFET drain-source voltage - ensures optimal SOA utilization during overvoltage/overcurrent events. |
| Retained auxiliary amplifier in shutdown | 60µA shutdown current preserves AOUT/IN+/1.25V reference - enables always-on UVLO or bias regulation without wake-up latency. |
| Back-to-back FET reverse protection support | SHDN and SNS pins tolerate –60V; eliminates need for Schottky diode - reduces forward drop and power loss in battery inputs. |
| Robust gate drive architecture | GATE pin delivers 150mA pull-down and clamps to VOUT + 14V - ensures reliable N-MOSFET control across full input range (4V–80V). |
| Extended temperature qualification | H-grade (–40°C to 125°C) with guaranteed parametric performance - validated for automotive engine bay and industrial control applications. |
Applications
| Automotive Load Dump Protection | Industrial Hot-Swap Power Distribution |
|---|---|
|
Use Scenario: Protecting infotainment ECUs and ADAS modules from 60V/200ms load dump transients in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: Surge stopper regulating output to safe clamp voltage while sustaining load operation; fault timer adapts to VDS to prevent MOSFET thermal runaway. Use Value: Enables uninterrupted system function during transients and guarantees MOSFET survival per ISO 7637-2 Pulse 5a specifications. |
Use Scenario: Safely inserting server blades into live backplanes with ±15% rail tolerance and transient immunity requirements. IC Role / Device Role / Timing Role: High-side switch controller with programmable overvoltage/overcurrent response; FLT signal triggers system-level fault logging before power removal. Use Value: Eliminates hot-swap controller ICs and discrete protection circuits - reduces BOM count and layout area while meeting IEC 61000-4-5 Level 4. |
| Battery-Powered High-Side Switch | Intrinsic Safety Barrier Supply |
|
Use Scenario: Controlling 24V/48V battery-fed motor drives and sensors in portable test equipment with strict quiescent current budgets. IC Role / Device Role / Timing Role: Gate driver for N-channel MOSFET pass element; 60µA shutdown current preserves battery life while retaining UVLO monitoring. Use Value: Extends runtime between charges by >3× vs. -1 variant; auxiliary amplifier replaces external comparator for battery voltage supervision. |
Use Scenario: Powering field instruments in hazardous areas where energy limitation and fault containment are mandated by IEC 60079-11. IC Role / Device Role / Timing Role: Intrinsically safe power limiter - clamps output voltage and current, disables output after programmable fault timer, and signals fault via FLT. Use Value: Meets entity parameter limits (VOC, ISC) without external Zener shunts; fault timer prevents sustained fault energy accumulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4356HDE-1#PBF | 7µA shutdown current; auxiliary amplifier disabled in shutdown; identical pinout and protection features. | Lacks retained reference/amplifier during shutdown - unsuitable for always-on UVLO or bias generation. | Select when lowest possible shutdown current is critical and auxiliary functions are unused during sleep. |
| TPS26633RTVR | Integrated 60V eFuse with fixed 1.2V overvoltage clamp; no adjustable FB, no auxiliary amplifier; 2.5ms fixed fault timer. | Fixed protection thresholds and no analog monitoring capability - limited flexibility for custom clamp voltages or secondary regulation. | Select for simplified, cost-sensitive designs where programmability and analog interface are unnecessary. |
Compared with LT4356HDE-1#PBF, the LT4356HDE-2#PBF trades 53µA higher shutdown current for retained auxiliary functionality - enabling UVLO and bias control without wake-up delay. Versus TPS26633RTVR, it offers adjustable clamping, VDS-adaptive timing, and analog monitoring at the cost of higher design complexity.
Availability
LT4356HDE-2#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial hot-swap power distribution, and battery-powered high-side switch applications requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for LT4356HDE-2#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 digital signal processing semiconductors, serving precision instrumentation, industrial automation, and automotive markets.
The LT4356 family is designed as high-voltage surge stoppers for mission-critical power path protection - targeting automotive, avionics, and industrial systems where continuous operation during transients is mandatory.
FAQ
What is the key functional difference between LT4356HDE-2#PBF and LT4356HDE-1#PBF?
The LT4356HDE-2#PBF maintains its auxiliary amplifier and internal 1.25V reference during shutdown (60µA IQ), enabling undervoltage lockout or always-on regulator control. In contrast, the LT4356HDE-1#PBF disables all functional blocks in shutdown (7µA IQ). Both share identical overvoltage/overcurrent protection, pinout, and temperature rating.
How does the fault timer in LT4356HDE-2#PBF adapt to MOSFET stress?
The LT4356HDE-2#PBF charges the TMR capacitor with a current proportional to VDS (VCC–VOUT): 2µA at 0.5V rising to 260µA at 80V during overcurrent. This ensures shorter fault timeouts under high-stress conditions - keeping the external MOSFET within its safe operating area without manual derating.
Can LT4356HDE-2#PBF support reverse battery protection without external components?
Yes. The LT4356HDE-2#PBF allows SNS and SHDN pins to be pulled to –60V relative to GND, and VCC tolerates –60V reverse bias. Combined with back-to-back N-MOSFET configuration, it eliminates the need for Schottky diodes - reducing forward voltage drop and power loss in battery-input systems.
What is the minimum recommended TMR capacitor value for LT4356HDE-2#PBF?
A minimum 10nF X7R capacitor is required between TMR and GND for loop stability. For typical automotive load dump protection (60V/200ms), a 6.8µF capacitor yields ~94ms total fault timer and 20ms early warning period - allowing sufficient time for system backup before power removal.
Does LT4356HDE-2#PBF require external components to set overvoltage clamp voltage?
Yes. The LT4356HDE-2#PBF uses the FB pin as a 1.25V servo point. An external resistor divider from OUT to GND sets the actual clamp voltage (VCLAMP = 1.25V × (1 + R1/R2)). No other active components are needed - the IC internally regulates GATE to maintain this FB voltage during overvoltage events.
LT4356HDE-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 12-WFDFN Exposed Pad
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Voltage - Clamping:
- 27V Adj
- Technology:
- External Switch
- Number of Circuits:
- 1
- Applications:
- -
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
LT4356HDE-2#PBF FAQ
1.How can I place an order for LT4356HDE-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356HDE-2#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 LT4356HDE-2#PBF reliable?
The price and inventory of LT4356HDE-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4356HDE-2#PBF is usually 5 days.
3.What payment methods are accepted for LT4356HDE-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356HDE-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356HDE-2#PBF?
LT4356HDE-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356HDE-2#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 LT4356HDE-2#PBF?
For technical support, including LT4356HDE-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356HDE-2#PBF requirements.
6.How does Aetrix verify that LT4356HDE-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT4356HDE-2#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 LT4356HDE-2#PBF meets industry standards.
7.What is the process for return or replacement of LT4356HDE-2#PBF?
All LT4356HDE-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356HDE-2#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 LT4356HDE-2#PBF part is unused and in its original packaging.
Return procedure for LT4356HDE-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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