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Analog Devices Inc. LT4356CDE-3#PBF
- Part No.:
- LT4356CDE-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT4356CDE-3#PBF.pdf
- Description:
- IC SURGE STOPPER W/LATCH 12-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,705
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Product details
Overview
LT4356CDE-3#PBF from Analog Devices is a surge protection controller IC that regulates output voltage during automotive load dump and other high-voltage transients by driving an external N-channel MOSFET. It features adjustable 1.25 V feedback threshold, 50 mV overcurrent sense limit, 4 V to 80 V operating range, and latchoff fault timer with early warning via FLT pin. It is used in automotive power distribution systems requiring uninterrupted operation under transient overvoltage.
For engineers reviewing the LT4356CDE-3#PBF datasheet, LT4356CDE-3#PBF pinout, LT4356CDE-3#PBF application, or LT4356CDE-3#PBF equivalent, key selection criteria include its 12-lead DFN package, 0°C to 70°C temperature grade, reverse input protection to –60 V, shutdown current < 7 µA, and compatibility with back-to-back FET reverse polarity schemes.
Technical Context
The LT4356CDE-3#PBF implements dual-fault protection using independent voltage and current amplifiers: the FB amplifier servo-regulates GATE to maintain 1.25 V at FB during overvoltage, while the SNS amplifier limits ΔVSNS to 50 mV during overcurrent. Both faults charge the TMR capacitor with voltage-dependent current-scaling from 2 µA to 50 µA (OV) or 4 µA to 260 µA (OC)-to dynamically align fault timing with MOSFET safe operating area (SOA).
Its gate drive architecture combines a charge pump (250 kHz) and active pull-down (150 mA for OV, 10 mA for OC), enabling fast turn-off and precise regulation. The SHDN pin tolerates –60 V to +100 V and latches all circuitry-including auxiliary amplifier-into <7 µA shutdown mode, with reset requiring >100 µs low pulse and >10 V/ms slew rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4 V to 80 V - supports cold-crank (4 V) and load dump (80 V) in automotive systems without external regulators. |
| Overcurrent Threshold | 50 mV across SNS–VCC - sets precise current limit independent of supply voltage; enables use of low-value, low-power sense resistors. |
| Feedback Reference | 1.25 V at FB pin - defines regulated output clamp voltage via external resistor divider; stable over full temperature range. |
| Fault Timer Current | 2–50 µA (OV) / 4–260 µA (OC) - scales with VDS to match MOSFET SOA, preventing thermal runaway during sustained faults. |
| Shutdown Quiescent Current | < 7 µA - enables always-on system monitoring with negligible battery drain in parked vehicle states. |
| Reverse Input Rating | –60 V on VCC and SHDN - allows direct connection to reversed battery without external diode or protection circuitry. |
| Package & Temp Grade | 12-lead 4 mm × 3 mm DFN, 0°C to 70°C - compact footprint for space-constrained ECUs; commercial-grade for non-safety-critical subsystems. |
Pinout & Package
LT4356CDE-3#PBF is housed in a 12-lead plastic DFN package (4 mm × 3 mm) with exposed pad (Pin 13), optionally connected to PCB ground. Pin functions are electrically identical to the DE package variant shown in Rev F datasheet Figure 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Auxiliary amplifier non-inverting input | Enables comparator or linear regulator control; clamped to 7 V; unused must be grounded. |
| AOUT | Auxiliary amplifier open-collector output | Sinks up to 2 mA from 80 V; drives LEDs/optocouplers for status signaling or external PNP biasing. |
| GND | Device ground reference | Common return for internal circuits and external sense resistor; exposed pad may connect here. |
| EN | Open-collector enable indicator | High-impedance when MOSFET is fully on (VOUT > VVCC – 0.7 V); latched until OUT resets below 0.5 V then rises above 2 V. |
| FLT | Open-collector fault warning output | Pulls low at VTMR = 1.25 V; signals impending shutdown; sinks up to 3 mA from 80 V for LED/opto interface. |
| SHDN | Shutdown control input | TTL-compatible; pulls internal blocks offline when < 0.4 V; withstands –60 V to +100 V; internal 7 µA pull-up provided. |
| TMR | Fault timer capacitor node | Charged by voltage-dependent current source; 1.25 V = FLT assert, 1.35 V = GATE latchoff; requires ≥10 nF X7R capacitor. |
| FB | Output voltage feedback input | 1.25 V reference point; connects to resistor divider from OUT to GND; clamped to 7 V; tie to GND to disable OV clamp. |
| OUT | MOSFET source voltage sense | Senses VDS for timer current scaling; EN asserts when VOUT > VVCC – 0.7 V; sets fault timing based on actual pass device stress. |
| GATE | N-channel MOSFET gate driver | Charge-pump driven; clamped to VOUT + 14 V max; pulls down with 150 mA (OV) or 10 mA (OC) to force MOSFET off. |
| SNS | Current sense input | Monitors voltage drop between VCC and SNS; internal amplifier holds ΔV = 50 mV; accepts –60 V to VCC + 0.3 V. |
| VCC | Main supply input | 4–80 V operating range; survives –60 V reverse battery; supplies all internal circuitry including charge pump and amplifiers. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Fault Timer | Timer current scales with VDS (2–260 µA) to match MOSFET SOA-shorter timeout for higher stress, extending device lifetime. |
| Back-to-Back FET Support | Eliminates Schottky diode in reverse polarity protection; reduces forward drop and power loss while maintaining –60 V tolerance. |
| Dual-Fault Detection | Independent overvoltage (via FB) and overcurrent (via SNS) paths with separate timer charging-prevents false trips and ensures robust coverage. |
| High-Voltage Tolerant I/O | VCC, SHDN, FLT, EN, AOUT rated to 80–100 V; SNS handles –60 V; enables direct integration into 24 V/48 V industrial and automotive rails. |
| Latchoff with Early Warning | FLT asserts at 1.25 V (warning), GATE disables at 1.35 V (shutdown); provides deterministic time window for system backup before power loss. |
| Low-Power Shutdown | Reduces ICC to < 7 µA with SHDN low; preserves battery life in always-connected modules without sacrificing fault readiness. |
Applications
| Automotive Load Dump Protection | Hot-Swap Power Distribution |
|---|---|
|
Use Scenario: Protecting infotainment head units and ADAS sensors from 60 V/200 ms load dump transients in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: LT4356CDE-3#PBF regulates MOSFET gate to clamp output at 12–27 V, sustaining load operation while dissipating surge energy in the FET. Use Value: Enables uninterrupted function during ISO 7637-2 Pulse 5a events without requiring oversized downstream capacitors or derated loads. |
Use Scenario: Safely inserting server blades or telecom line cards into live backplanes carrying 48 V DC power. IC Role / Device Role / Timing Role: LT4356CDE-3#PBF controls inrush current via soft-start-like GATE ramp and detects short circuits within microseconds. Use Value: Prevents bus voltage collapse and arc damage during insertion; FLT signal triggers system-level fault logging before hardware shutdown. |
| Battery-Powered High-Side Switch | Reverse Polarity Protected Power Path |
|
Use Scenario: Managing power to critical subsystems (e.g., GPS, telematics) in battery-backed industrial IoT gateways. IC Role / Device Role / Timing Role: LT4356CDE-3#PBF acts as intelligent high-side switch with programmable overcurrent limit and thermal-aware fault timing. Use Value: Replaces discrete high-side switches and current monitors; reduces BOM count while adding diagnostic FLT/EN outputs. |
Use Scenario: Powering portable medical devices from interchangeable Li-ion packs where incorrect battery insertion must not damage electronics. IC Role / Device Role / Timing Role: LT4356CDE-3#PBF enables back-to-back N-FET configuration, blocking reverse current with < 50 mΩ total RDS(ON). Use Value: Achieves near-zero forward voltage drop vs. Schottky diodes, preserving battery runtime and eliminating heat sink requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365CDDB#TRPBF | Integrated 42 V MOSFET; fixed 28.5 V OV clamp; no adjustable TMR; 8-lead DFN | Lower component count but less flexible OV setpoint and no SOA-adaptive timing | Select when simplicity and board space outweigh need for programmable clamp voltage and dynamic fault timing. |
| TPS26632RGER | Integrated 60 V MOSFET; fixed 36 V OV clamp; I²C-configurable current limit; 20-lead QFN | Digital configurability and integrated FET reduce external parts but increase cost and layout complexity | Select when system-level firmware control of protection thresholds and event logging is required. |
Compared with LTC4365CDDB#TRPBF and TPS26632RGER, LT4356CDE-3#PBF offers superior design flexibility through external MOSFET selection, adjustable output clamp voltage, and SOA-matched fault timing-critical for optimizing thermal performance in high-reliability automotive and industrial power paths.
Availability
LT4356CDE-3#PBF is available at Aetrix Electronics and suitable for automotive ECU power management, industrial hot-swap subsystems, and battery-powered high-side switching applications requiring stable component supply and long-term lifecycle support.
Supply support for LT4356CDE-3#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 safety markets.
The LT4356 family is designed as a high-voltage surge stopper controller for automotive and industrial power systems, emphasizing robust transient immunity, MOSFET SOA optimization, and latchoff fault management without microcontroller intervention.
FAQ
What is the primary function of the LT4356CDE-3#PBF in a power system?
The LT4356CDE-3#PBF is a surge protection controller that regulates output voltage during overvoltage transients (e.g., automotive load dump) by driving an external N-channel MOSFET. It also provides overcurrent protection by limiting the voltage across a sense resistor to 50 mV. Its core function is to sustain load operation during short transients while safeguarding downstream components and the pass MOSFET from destructive stress-making LT4356CDE-3#PBF essential in automotive and industrial power distribution.
How does the LT4356CDE-3#PBF implement dynamic fault timing?
The LT4356CDE-3#PBF charges the TMR capacitor with a current that scales linearly with the voltage across the external MOSFET (VDS). During overvoltage, current ranges from 2 µA (at ≤0.5 V VDS) to 50 µA (at 75 V); during overcurrent, it ranges from 4 µA to 260 µA (at 80 V). This ensures shorter fault timeouts under higher stress-directly matching MOSFET safe operating area (SOA) limits. As a result, LT4356CDE-3#PBF avoids both premature shutdown and thermal runaway, extending reliability in real-world surge conditions.
Can the LT4356CDE-3#PBF be used with reverse battery protection?
Yes, the LT4356CDE-3#PBF supports reverse input protection to –60 V on both VCC and SHDN pins, enabling direct connection to reversed batteries without external diodes. It also facilitates back-to-back N-channel FET configurations-replacing Schottky diodes-to eliminate forward voltage drop and associated power loss. This capability makes LT4356CDE-3#PBF ideal for portable and automotive systems where efficiency and reverse polarity resilience are critical.
What is the role of the FLT and EN pins on the LT4356CDE-3#PBF?
The FLT pin is an open-collector fault indicator that pulls low when the TMR voltage reaches 1.25 V, providing early warning of impending shutdown due to overvoltage or overcurrent. The EN pin goes high-impedance when the external MOSFET is fully on (VOUT > VVCC – 0.7 V), confirming healthy conduction. Both pins sink up to 3 mA from 80 V and interface directly with LEDs or optocouplers. These signals enable real-time system diagnostics and state monitoring-key features distinguishing LT4356CDE-3#PBF from basic protection ICs.
How is the LT4356CDE-3#PBF reset after a fault-induced latchoff?
After LT4356CDE-3#PBF latches off (GATE pulled low), recovery requires pulling the SHDN pin below 0.4 V for at least 100 µs, then raising it above 2.1 V with a slew rate faster than 10 V/ms. This sequence resets internal logic and re-enables gate drive. The TMR capacitor must first discharge to ~0.5 V (typical discharge current 2.2 µA) to ensure the MOSFET has cooled. Unlike auto-retry controllers, LT4356CDE-3#PBF requires explicit reset-ensuring controlled, deterministic recovery critical for safety-critical automotive applications.
LT4356CDE-3#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)
LT4356CDE-3#PBF FAQ
1.How can I place an order for LT4356CDE-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356CDE-3#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 LT4356CDE-3#PBF reliable?
The price and inventory of LT4356CDE-3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4356CDE-3#PBF is usually 5 days.
3.What payment methods are accepted for LT4356CDE-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356CDE-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356CDE-3#PBF?
LT4356CDE-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356CDE-3#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 LT4356CDE-3#PBF?
For technical support, including LT4356CDE-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356CDE-3#PBF requirements.
6.How does Aetrix verify that LT4356CDE-3#PBF is sourced from the original manufacturer or authorized distributors?
All LT4356CDE-3#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 LT4356CDE-3#PBF meets industry standards.
7.What is the process for return or replacement of LT4356CDE-3#PBF?
All LT4356CDE-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356CDE-3#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 LT4356CDE-3#PBF part is unused and in its original packaging.
Return procedure for LT4356CDE-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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