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Analog Devices Inc. LT3800EFE#PBF
- Part No.:
- LT3800EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3800EFE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,669
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Product details
Overview
LT3800EFE#PBF from Analog Devices (formerly Linear Technology) is a high-voltage synchronous current-mode step-down DC/DC controller IC driving external N-channel MOSFETs, operating from 4V to 60V input, delivering up to 36V output with 200kHz fixed switching frequency, 1% output regulation accuracy, and 100μA no-load quiescent current - used in 48V telecom power supplies and industrial control systems.
For engineers reviewing the LT3800EFE#PBF datasheet, LT3800EFE#PBF pinout, LT3800EFE#PBF application, or LT3800EFE#PBF equivalent, key selection considerations include its adaptive nonoverlap circuitry preventing shoot-through, reverse inductor current inhibit for discontinuous operation, programmable soft-start with auto-reset, 16-lead thermally enhanced TSSOP package, and support for output-derived VCC/BOOST sourcing to minimize VIN quiescent current.
Technical Context
The LT3800EFE#PBF implements a fixed-frequency (200kHz) current-mode control architecture with an internal oscillator, slope compensation, and dual gate drivers (TG and BG) supporting bootstrapped high-side and synchronous low-side N-MOSFETs. Its error amplifier features 1.231V reference, 350μmhos transconductance, and 62dB DC gain, with VC pin directly setting peak switch current per cycle.
It integrates adaptive nonoverlap timing (150–200ns), reverse-current inhibit via ±150mV current sense threshold with 10mV positive offset, and Burst Mode® operation triggered by BURST_EN < 0.5V - reducing no-load VIN current to 100μA while maintaining 1.2V VC clamp margin and 100mV burst threshold hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide-range industrial and telecom inputs without external pre-regulation |
| Switching Frequency | 200kHz (±10kHz) - enables compact magnetics and predictable EMI profile |
| Output Regulation Accuracy | ±1% over temperature - ensures stable voltage delivery for sensitive downstream loads |
| No-Load Quiescent Current | 100μA - extends battery life in standby or light-load applications |
| Current Sense Threshold | ±150mV across SENSE+/- - sets precise peak current limit independent of duty cycle |
| Soft-Start Control Current | 2μA - enables accurate output voltage slew rate programming via external capacitor |
| Gate Drive Output Voltage | 9.8V (typical "ON" during bootstrap operation) - ensures full enhancement of standard logic-level N-MOSFETs |
| Shutdown Current | 10μA - enables ultra-low-power system sleep modes |
Pinout & Package
LT3800EFE#PBF is housed in a 16-lead thermally enhanced TSSOP package (FE) with exposed backside SGND pad (Pin 17) requiring PCB soldering for thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main input supply rail | Accepts 4V–60V; powers internal regulator and provides headroom for VCC generation |
| SHDN (Pin 3) | Precision enable/disable control | 1.35V rising threshold with 120mV hysteresis; enables UVLO integration and <10μA shutdown mode |
| BURST_EN (Pin 5) | Mode selection interface | Controls Burst Mode (≤0.5V) and reverse-current inhibit (0.5–2.5V); disables both >2.5V |
| VFB (Pin 6) | Error amplifier inverting input | Compares against 1.231V internal reference; programs output voltage via resistive divider |
| VC (Pin 7) | Error amplifier output | Sets peak switch current per cycle; clamped at 100mV below burst threshold during low-load operation |
| SENSE– / SENSE+ (Pins 8, 9) | Differential current sense inputs | Monitor inductor current with ±150mV threshold and 10mV reverse-offset protection |
| TG (Pin 15) | High-side N-MOSFET gate driver | Bootstrapped output; requires BOOST–SW decoupling capacitor for full 9.8V gate drive |
| BG (Pin 11) | Low-side synchronous rectifier driver | Directly drives N-MOSFET source-connected to PGND; coordinated with TG via nonoverlap logic |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive nonoverlap circuitry | Prevents shoot-through by enforcing 150–200ns dead time between TG turn-off and BG turn-on (and vice versa) |
| Reverse inductor current inhibit | Disables BG when inductor current approaches zero, enabling discontinuous conduction and improving light-load efficiency |
| Programmable soft-start with auto-reset | Controls output voltage slew rate via CSS capacitor; re-engages if VFB drops below 0.3V (70% regulation) during brown-out |
| Output-derived VCC/BOOST sourcing | Allows VCC and BOOST to be powered from converter output, eliminating VIN regulator losses and reducing total quiescent current |
| Internal 8V linear regulator with ~1V dropout | Enables start-up from VIN ≥7.5V; supports external VCC biasing down to 4V VIN when VCC is pre-biased ≥6.5V |
| Burst Mode® operation | Reduces no-load VIN current to 100μA by cycling full-power bursts only as needed to maintain regulation |
Applications
| 48V Telecom Power Supplies | Industrial Control Systems |
|---|---|
Use Scenario: Converting -48V or +48V telecom rack supply to 12V/5V intermediate bus for line cards and baseband processors. IC Role / Device Role / Timing Role: High-voltage synchronous buck controller managing external Si7850DP/Si7370DP MOSFETs with adaptive nonoverlap and reverse-current inhibit. Use Value: Achieves >90% efficiency at 10% load via Burst Mode and discontinuous operation, meeting GR-1089 Class A EMC requirements with fixed 200kHz frequency. | Use Scenario: Providing isolated 24V/15V rails from 40–60V industrial DC bus for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary controller in non-isolated buck stage; uses VFB feedback and VC loop compensation to maintain ±1% regulation under 40°C–85°C ambient. Use Value: 125°C junction-rated operation and robust UVLO (7.5V start, 3.8V hysteresis) ensure reliable startup and hold-up during brown-outs on unregulated factory power. |
| Avionics Power Conversion | Distributed Power Architectures |
Use Scenario: Generating 28V regulated bus from aircraft 270V DC or 28V variable input in flight control actuator subsystems. IC Role / Device Role / Timing Role: High-input-voltage step-down controller with reverse overcurrent protection and soft-start sequencing for fault-tolerant power-up. Use Value: 60V absolute max VIN rating and 100μA shutdown current meet DO-160 Section 22 lightning-induced transient immunity and low-power standby requirements. | Use Scenario: Local point-of-load conversion in server backplanes or datacom chassis where 12V or 48V mid-rail feeds multiple 3.3V/1.8V regulators. IC Role / Device Role / Timing Role: Intermediate bus converter driving paralleled MOSFETs; leverages BOOST bootstrap and PGND/SGND separation for clean gate drive return paths. Use Value: Thermally enhanced TSSOP package with soldered exposed pad sustains 75W output ([email protected]) at 50°C ambient without heatsink. |
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 |
|---|---|---|---|
| LTC3891EMSE#PBF | Wider VIN range (4–60V → 4–150V), integrated MOSFET drivers with higher peak current (1.2A vs 0.8A), supports phase modulation | Targeted at ultra-high-input applications like solar MPPT and battery test equipment; lacks reverse-current inhibit | Select LTC3891EMSE#PBF when input exceeds 60V or higher gate drive current is required; verify absence of reverse-inhibit does not impact light-load efficiency targets |
| MP24894GQKT-LF-Z | Lower VIN max (40V), integrated power MOSFETs (no external FETs), fixed 250kHz frequency, no Burst Mode | Designed for cost-sensitive, space-constrained applications like PoE PDs; eliminates external FET layout but limits max output current | Select MP24894GQKT-LF-Z for simplified BOM and layout where 40V VIN ceiling and absence of Burst Mode are acceptable |
Compared with LTC3891EMSE#PBF and MP24894GQKT-LF-Z, the LT3800EFE#PBF uniquely balances 60V input capability, external FET flexibility, Burst Mode efficiency, and reverse-current inhibit - making it optimal for telecom and industrial designs requiring both wide input range and sub-100μA standby current.
Availability
LT3800EFE#PBF is available at Aetrix Electronics and suitable for 48V telecom power supplies, industrial control systems, and avionics power conversion requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LT3800EFE#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous qualification and long-term product support.
The LT3800EFE#PBF belongs to Linear's high-voltage synchronous buck controller family, designed specifically for industrial, telecom, and transportation applications demanding wide input range, low quiescent current, and robust protection features.
FAQ
What is the minimum input voltage required for LT3800EFE#PBF to start up?
The LT3800EFE#PBF requires a minimum VIN of 7.5V to initiate startup, ensuring sufficient headroom for its internal VCC regulator to reach its 6.25V UVLO threshold. However, once running, if VCC is externally biased to ≥6.5V, the LT3800EFE#PBF can continue operating down to VIN = 4V - a key feature for brown-out resilience in industrial systems.
How does the reverse-current inhibit feature function in LT3800EFE#PBF?
The LT3800EFE#PBF detects inductor current approaching zero using its ±150mV SENSE+/- comparator with a built-in 10mV positive offset. When enabled (via BURST_EN = VFB), it disables the BG driver before current reverses, forcing discontinuous conduction mode. This reduces conduction losses at light loads and prevents negative inductor current - directly improving efficiency below 20% load without requiring external diodes.
Can LT3800EFE#PBF operate without external MOSFETs?
No, the LT3800EFE#PBF is a controller-only IC and requires external N-channel MOSFETs for both high-side (driven by TG) and low-side (driven by BG) switching. It does not integrate power switches. Compatible FETs include Si7850DP (high-side) and Si7370DP (low-side) as shown in the 12V/75W reference design - selecting appropriate Rds(on), Qg, and voltage ratings is essential for thermal and efficiency performance.
What is the purpose of the exposed pad (Pin 17) on the LT3800EFE#PBF TSSOP package?
The exposed pad on the LT3800EFE#PBF is electrically connected to SGND (signal ground) and serves as the primary thermal path. It must be soldered to a dedicated PCB copper pour tied to SGND to achieve θJC = 10°C/W and prevent junction temperature exceedance above 125°C under full load. Leaving it unconnected degrades thermal performance and risks reliability failure in sustained 75W operation.
How is soft-start configured and controlled in LT3800EFE#PBF?
The LT3800EFE#PBF implements programmable soft-start via an external capacitor (CSS) connected through a 200kΩ resistor to VOUT. A constant 2μA current charges CSS, controlling output voltage slew rate (∆VOUT/∆t). Soft-start engages until VFB reaches 1.185V (95% of 1.231V reference) and auto-resets if VFB falls below 0.3V - enabling controlled recovery from undervoltage events without manual reset circuitry.
LT3800EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 60V
- Frequency - Switching:
- 200kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT3800EFE#PBF FAQ
1.How can I place an order for LT3800EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3800EFE#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 LT3800EFE#PBF reliable?
The price and inventory of LT3800EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3800EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3800EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3800EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3800EFE#PBF?
LT3800EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3800EFE#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 LT3800EFE#PBF?
For technical support, including LT3800EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3800EFE#PBF requirements.
6.How does Aetrix verify that LT3800EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3800EFE#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 LT3800EFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3800EFE#PBF?
All LT3800EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3800EFE#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 LT3800EFE#PBF part is unused and in its original packaging.
Return procedure for LT3800EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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