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Analog Devices Inc. LT8336EV#PBF
- Part No.:
- LT8336EV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFQFN Exposed Pad
- Datasheet:
-
LT8336EV#PBF.pdf
- Description:
- IC REG BOOST ADJ 2.5A 16LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:692
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Product details
Overview
LT8336EV#PBF from Analog Devices is a 40V, 2.5A synchronous step-up DC/DC converter with Silent Switcher architecture, 300kHz–3MHz programmable switching frequency, 0.3µA shutdown quiescent current, and PassThru™ mode for VIN ≥ VOUT operation. It integrates dual 40V MOSFETs and supports automotive preboost and industrial power supply applications requiring low EMI and high light-load efficiency.
For engineers reviewing the LT8336EV#PBF datasheet, LT8336EV#PBF pinout, LT8336EV#PBF application, or LT8336EV#PBF equivalent, key selection criteria include its 16-lead 3mm × 3mm LQFN package, AEC-Q100 qualification (E-grade), 100% duty cycle capability in PassThru mode, spread-spectrum EMI reduction, and dual-mode light-load control (Burst Mode® or pulse-skipping).
Technical Context
The LT8336EV#PBF employs fixed-frequency current-mode control with internal slope compensation and dual-MOSFET synchronous rectification. Its PassThru mode activates when VIN ≥ VOUT, disabling the top switch and holding the bottom switch continuously on to minimize conduction loss.
EMI suppression is achieved via integrated Silent Switcher architecture-requiring two matched 1µF capacitors between VOUT pins (6 & 7) and adjacent GND pins (5 & 8)-and optional spread-spectrum frequency modulation (±0.45% center frequency deviation, ±20% range) selectable via SYNC/MODE pin configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 40V - supports wide-range industrial and automotive battery inputs including cold-crank (4.5V) and load-dump (36V) conditions. |
| Output Current Capability | 2.5A continuous - determined by integrated 40V/70mΩ bottom and 75mΩ top MOSFETs with thermal derating above 125°C junction temperature. |
| Quiescent Current (Burst Mode) | 4µA at VIN - enables >10-year battery life in always-on IoT sensors and telematics modules. |
| Switching Frequency Range | 300kHz to 3MHz - adjustable via RT resistor; 2MHz setting avoids AM band and enables compact 6.8µH inductor use. |
| FB Regulation Accuracy | ±0.6% over –40°C to 125°C - ensures stable 24V output across automotive temperature extremes without external trimming. |
| PassThru Threshold | VIN – VOUT ≤ 0V (rising), ≤ –0.6V (falling) - enables seamless transition to direct conduction with <100ns response time during input voltage surges. |
| EMI Performance | CISPR 25 Class 5 compliant - peak radiated emissions <40dBµV/m at 100–1000MHz with SSFM enabled, eliminating need for external EMI filters. |
Pinout & Package
LT8336EV#PBF uses a 16-lead 3mm × 3mm LQFN package with exposed thermal pad (Pin 17 = GND). The package meets MSL Level 3 and is RoHS-compliant with Au (e4) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC/MODE (1) | Mode selection & sync input | Selects Burst Mode®, pulse-skipping, or external clock sync; configures SSFM; ignored during PassThru or startup. |
| RT (2) | Frequency programming | Resistor-to-GND sets switching frequency from 300kHz–3MHz; open-circuit not allowed. |
| GND (3,5,8,17) | Power & signal ground | Exposed pad (17) must be soldered to PCB ground plane for thermal dissipation (θJCbottom = 8.2°C/W) and EMI loop closure. |
| FB (4) | Feedback input | Monitors output via resistor divider; 1.000V nominal reference enables precise 24V output with 0.1% resistor tolerance. |
| VOUT (6,7) | Output power terminals | Dual pins reduce IR drop and enable Silent Switcher capacitor placement: one 1µF cap per pin to adjacent GND (5 & 8). |
| SW (9,10,11) | Switch node | Three paralleled pins handle high di/dt; connect directly to inductor and CBST capacitor anode. |
| BST (12) | Bootstrap supply | 0.1µF ceramic capacitor between BST and SW provides gate drive voltage for top MOSFET. |
| VIN (13) | Main input supply | Accepts 2.7–40V; powers INTVCC LDO and supplies energy to boost stage; requires local 10µF ceramic input capacitance. |
| EN/UVLO (14) | Enable & undervoltage lockout | 1.0V threshold with 100mV hysteresis; 0.3µA shutdown current enables battery cutoff at 3.3V with 1MΩ divider. |
| INTVCC (15) | Internal 3.5V regulator bypass | Must be decoupled with ≥1µF ceramic cap; supplies gate drivers; no external loading permitted. |
| PG (16) | Power good flag | Open-drain output pulled low if VOUT deviates >±8%, EN/UVLO <1V, INTVCC fault, or thermal shutdown occurs. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Integrated dual-VOUT/GND capacitor paths reduce high-frequency magnetic field emissions by >30dB vs conventional boost converters. |
| PassThru™ Mode | 100% duty cycle operation eliminates switching losses when VIN ≥ VOUT, reducing thermal stress and enabling seamless input transients. |
| Low-IQ Burst Mode® | 4µA VIN quiescent current at light loads extends battery runtime in always-on systems without sacrificing output regulation accuracy. |
| Spread-Spectrum Modulation | Configurable ±0.45% center frequency deviation spreads EMI energy across 20% bandwidth, easing CISPR 25 Class 5 compliance. |
| AEC-Q100 Qualified (Grade E) | Validated for –40°C to +125°C operation with lifetime reliability testing per automotive standards; suitable for under-hood applications. |
| Internal Compensation | Eliminates external compensation network, reducing BOM count and layout sensitivity while maintaining stability across 2.7–40V input range. |
Applications
| Automotive Preboost Converter | Industrial 24V Power Supply |
|---|---|
Use Scenario: Boosts 9–16V vehicle battery to stable 24V for ADAS cameras and radar modules during cold-crank (4.5V) and load-dump (36V) events. IC Role / Device Role / Timing Role: Primary step-up regulator with PassThru mode enabling direct conduction during input surges, minimizing thermal stress on MOSFETs. Use Value: Eliminates need for external surge protection and reduces system footprint by 35% versus discrete solutions with comparable EMI performance. |
Use Scenario: Generates regulated 24V from 12V factory bus for PLC I/O modules requiring low-noise, high-reliability power in noisy industrial environments. IC Role / Device Role / Timing Role: Synchronous boost controller with spread-spectrum modulation to meet CISPR 25 Class 5 radiated emissions limits without shielding. Use Value: Achieves >92% efficiency at 1A load while maintaining <15mVpp output ripple, reducing thermal management requirements by 40%. |
| IoT Sensor Node Power | Medical Portable Equipment |
Use Scenario: Powers ultra-low-power gas sensors and BLE transceivers from coin-cell batteries (2.0–3.6V) with multi-year operational life. IC Role / Device Role / Timing Role: High-efficiency boost converter operating in Burst Mode® with 4µA quiescent current and soft-start to prevent inrush current damage. Use Value: Enables >10-year battery life at 10µA average load while maintaining 3.3V output accuracy within ±1.5% over temperature. |
Use Scenario: Supplies 5V/3.3V rails for portable ultrasound and patient monitors powered by Li-ion packs (3.0–4.2V). IC Role / Device Role / Timing Role: Low-EMI step-up regulator with PG flag for system-level power sequencing and fault reporting. Use Value: Meets IEC 60601-1 EMI requirements without ferrite beads, simplifying FDA certification and reducing bill-of-materials cost by $0.42/unit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8337EV#PBF | Higher 5A output current, 60V rating, same pinout and feature set; 1.2V FB reference vs 1.0V. | Required for >2.5A loads or 40–60V input ranges; not drop-in due to different feedback divider ratio. | Select LT8337EV#PBF only when output current exceeds 2.5A or input voltage exceeds 40V. |
| TPS61088RHLR | 2.7–12V input, 5.5A max, no PassThru mode, no SSFM, 1.2V FB, QFN-20 package. | Limited to low-voltage consumer applications; lacks automotive qualification and EMI-hardened architecture. | Use TPS61088RHLR only in cost-sensitive, non-automotive designs where input stays below 12V and EMI is unregulated. |
Compared with LT8336EV#PBF, LT8337EV#PBF delivers higher current but requires FB resistor recalibration, while TPS61088RHLR offers higher peak current at lower voltage but lacks PassThru, SSFM, and AEC-Q100 support-making LT8336EV#PBF the optimal choice for automotive and industrial 2.7–40V boost applications demanding low EMI and ultra-low IQ.
Availability
LT8336EV#PBF is available at Aetrix Electronics and suitable for automotive preboost, industrial 24V power supplies, and IoT sensor node applications requiring stable component supply, AEC-Q100 qualification, and long-term lifecycle support.
Supply support for LT8336EV#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 industrial, automotive, communications, and healthcare markets with precision power management solutions.
The LT8336EV#PBF belongs to Analog Devices' Silent Switcher® synchronous boost converter product line, designed specifically for automotive and industrial applications demanding ultra-low EMI, high efficiency across wide input ranges, and robust operation in harsh thermal environments.
FAQ
What is the maximum output voltage supported by the LT8336EV#PBF?
The LT8336EV#PBF does not impose a hard upper limit on output voltage; it is constrained by external component ratings and layout parasitics. The IC's 40V-rated internal MOSFETs and 40V absolute maximum ratings on VIN/VOUT pins allow safe operation up to 36V output in typical applications. For 48V systems, external clamping or cascaded topology is required. The LT8336EV#PBF's feedback loop maintains regulation accuracy regardless of output voltage setting, provided the FB divider tolerances and noise immunity are maintained.
Does the LT8336EV#PBF require external compensation components?
No, the LT8336EV#PBF features fully internal compensation, eliminating the need for external Type II or Type III compensation networks. This simplifies design, reduces BOM count, and improves layout robustness across its full 2.7–40V input range and 300kHz–3MHz switching frequency span. Stability is guaranteed with standard output capacitor ESR values (1–50mΩ) and inductor DCR <100mΩ, as verified in the datasheet's stability analysis section for the LT8336EV#PBF.
How does PassThru™ mode operate in the LT8336EV#PBF?
In PassThru™ mode, the LT8336EV#PBF disables the top MOSFET and holds the bottom MOSFET continuously on when VIN ≥ VOUT, effectively shorting input to output through the inductor and synchronous switch. This occurs automatically without control pin intervention, with hysteresis (–0.6V falling threshold) preventing chatter. During PassThru, the LT8336EV#PBF draws only 15µA quiescent current and maintains PG assertion as long as output remains within ±8% regulation.
Can the LT8336EV#PBF synchronize to an external clock?
Yes, the LT8336EV#PBF supports external clock synchronization via the SYNC/MODE pin (Pin 1). When a clean digital clock signal with ≥100ns pulse width is applied, the LT8336EV#PBF locks its switching frequency to the external source and operates in pulse-skipping mode at light loads. An RT resistor should still be installed to set a fallback frequency; mismatched SYNC and RT frequencies may cause subharmonic oscillation.
What is the thermal performance of the LT8336EV#PBF in its LQFN package?
The LT8336EV#PBF in its 3mm × 3mm LQFN package has θJCbottom = 8.2°C/W and θJA = 42.8°C/W (with 2-layer 1oz copper, 1in² exposed pad). At 2.5A output and 12V input → 24V output, typical power dissipation is ~1.2W, resulting in ~100°C junction rise above ambient with proper PCB copper pour. Derating begins above 125°C junction temperature; the LT8336EV#PBF includes thermal shutdown at ~170°C to prevent damage.
LT8336EV#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 2.7V
- Voltage - Output (Max):
- 40V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 300kHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-LQFN (3x3)
LT8336EV#PBF FAQ
1.How can I place an order for LT8336EV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8336EV#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 LT8336EV#PBF reliable?
The price and inventory of LT8336EV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8336EV#PBF is usually 5 days.
3.What payment methods are accepted for LT8336EV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8336EV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8336EV#PBF?
LT8336EV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8336EV#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 LT8336EV#PBF?
For technical support, including LT8336EV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8336EV#PBF requirements.
6.How does Aetrix verify that LT8336EV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8336EV#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 LT8336EV#PBF meets industry standards.
7.What is the process for return or replacement of LT8336EV#PBF?
All LT8336EV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8336EV#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 LT8336EV#PBF part is unused and in its original packaging.
Return procedure for LT8336EV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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