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Analog Devices Inc. LT3800IFE#PBF
- Part No.:
- LT3800IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3800IFE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,435
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Product details
Overview
LT3800IFE#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 at 200kHz fixed frequency, with 1% output regulation accuracy and 100μA no-load quiescent current - used in 48V telecom power supplies and industrial control systems.
For engineers reviewing the LT3800IFE#PBF datasheet, LT3800IFE#PBF pinout, LT3800IFE#PBF application, or LT3800IFE#PBF equivalent, key selection considerations include its adaptive nonoverlap circuitry preventing shoot-through, reverse inductor current inhibit for discontinuous operation, programmable soft-start controlling output slew rate, and thermally enhanced 16-lead TSSOP package with exposed SGND pad.
Technical Context
The LT3800IFE#PBF implements a fixed-frequency (200kHz) current-mode control architecture with internal oscillator, slope compensation, and dual gate drivers (TG and BG) supporting bootstrapped high-side and synchronous low-side switching. Its error amplifier features 1.231V reference, 275–400μmhos transconductance, and 62dB DC gain, enabling precise voltage regulation via external resistive feedback.
It integrates adaptive nonoverlap timing (150–200ns), reverse-current inhibit with 10mV sense offset, Burst Mode® operation (enabled via BURST_EN < 0.5V), and a programmable soft-start function using CSS pin with 2μA control current - all coordinated through a functional block diagram including UVLO comparators, internal 8V VCC regulator, and current-sense comparator with ±150mV threshold.
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. |
| Output Voltage Range | Up to 36V - set by external resistor divider on VFB pin referencing 1.231V internal reference. |
| Switching Frequency | 200kHz (TYP) - fixed-frequency operation enables predictable EMI filtering and inductor sizing. |
| No-Load Quiescent Current | <100μA in Burst Mode - extends battery life in standby or light-load applications. |
| Regulation Accuracy | ±1% over line, load, and temperature - ensures stable output under varying conditions. |
| Current Sense Threshold | ±150mV across SENSE+ and SENSE− - provides accurate, duty-cycle-independent current limiting. |
| Soft-Start Control Current | 2μA - enables precise output voltage slew rate programming via external capacitor. |
| Shutdown Current | <10μA - minimizes system-level leakage when disabled. |
Pinout & Package
LT3800IFE#PBF is housed in a 16-lead thermally enhanced plastic TSSOP package (FE grade) with exposed backside SGND pad (Pin 17) requiring PCB soldering for thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Primary input supply | Accepts 4V–60V; powers internal VCC regulator and provides bootstrap energy via VCC or external source. |
| NC (Pin 2) | No connection | Unbonded; must remain unconnected per datasheet. |
| SHDN (Pin 3) | Enable/shutdown control | 1.35V rising threshold with 120mV hysteresis; pulls IC into <10μA shutdown when below 0.7V. |
| CSS (Pin 4) | Soft-start timing input | Receives 2μA current to control output voltage ramp rate; shorting to SGND disables soft-start. |
| BURST_EN (Pin 5) | Mode selection | <0.5V enables Burst Mode + reverse-current inhibit; 0.5–2.5V enables reverse-inhibit only; >2.5V disables both. |
| VFB (Pin 6) | Error amplifier inverting input | Compares against 1.231V internal reference; sets output voltage via external resistor divider. |
| VC (Pin 7) | Error amplifier output | Drives current-sense comparator threshold; clamped at 100mV below burst threshold during Burst Mode. |
| SENSE− (Pin 8) | Current sense negative input | Paired with SENSE+ to detect ±150mV differential for cycle-by-cycle current limiting. |
| SENSE+ (Pin 9) | Current sense positive input | Paired with SENSE−; includes 10mV offset to prevent reverse current conduction. |
| PGND (Pin 10) | Power ground return | High-current path for synchronous switch; must be routed separately from SGND to avoid noise coupling. |
| BG (Pin 11) | Bottom-gate driver output | Drives synchronous N-MOSFET source-to-ground; complements TG with nonoverlap timing. |
| VCC (Pin 12) | Internal regulator output | 8V regulated supply (1V dropout); can be externally powered to reduce VIN dissipation. |
| NC (Pin 13) | No connection | Unbonded; must remain unconnected. |
| SW (Pin 14) | Switch node reference | Return for BOOST capacitor; defines local ground for bootstrapped high-side drive. |
| TG (Pin 15) | Top-gate driver output | Drives bootstrapped N-MOSFET gate; uses internal dynamic bootstrap for >9.8V gate "ON" voltage. |
| BOOST (Pin 16) | Bootstrapped supply rail | Ground-referred up to 75V; decoupled with 1μF low-ESR cap to SW for high-side gate drive. |
| SGND (Pin 17) | Signal ground reference | Exposed pad on package backside; must be soldered to PCB ground plane for thermal management and low-noise operation. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive nonoverlap circuitry | Prevents simultaneous TG/BG conduction (shoot-through) with 150–200ns dead time, ensuring safe MOSFET switching. |
| Reverse inductor current inhibit | Disables BG when inductor current approaches zero, enabling discontinuous conduction mode and improving light-load efficiency. |
| Programmable soft-start | Controls output voltage slew rate via 2μA CSS current, reducing startup surge and overshoot while supporting supply sequencing. |
| Burst Mode® operation | Reduces total input quiescent current to <100μA at no load by cycling full-power bursts only as needed to maintain regulation. |
| Dynamic bootstrap gate drive | Maintains >9.8V gate-source "ON" voltage for TG during continuous operation, maximizing high-side MOSFET RDS(on) utilization. |
| Input UVLO with hysteresis | Enables precise undervoltage lockout (7.5V rising, 3.65V falling) on VIN, configurable via SHDN pin for system-level brown-out protection. |
Applications
| 48V Telecom Power Supplies | Industrial Control Systems |
|---|---|
Use Scenario: Converting -48V or +48V telecom distribution bus to intermediate 12V or 5V rails for base station logic and interface circuitry. IC Role / Device Role / Timing Role: Primary step-down controller managing high-efficiency power conversion with strict ripple and transient response requirements. Use Value: 200kHz fixed frequency simplifies EMI filter design; reverse-current inhibit maintains >85% efficiency at 10% load; 60V max input withstands telecom surge transients. | Use Scenario: Providing isolated or non-isolated 24V/15V auxiliary power in PLCs, motor drives, and sensor interfaces operating from 24V–60V industrial buses. IC Role / Device Role / Timing Role: High-reliability DC/DC controller supporting wide input range and robust thermal performance in harsh environments. Use Value: 16-lead TSSOP with exposed SGND pad enables 125°C junction operation; 1% regulation accuracy ensures stable I/O voltage references; UVLO hysteresis prevents cycling during brown-outs. |
| Avionics Power Conversion | Distributed Power Architectures |
Use Scenario: Generating 28V or 12V secondary rails from 270V DC aircraft bus or 28V primary bus in flight control and navigation subsystems. IC Role / Device Role / Timing Role: Radiation-tolerant (by design) controller implementing fault-aware power delivery with reverse-current protection. Use Value: Reverse-current inhibit prevents backfeeding into upstream converters during partial failure; 100μA Burst Mode current extends emergency battery runtime. | Use Scenario: Local point-of-load (POL) regulation in server, storage, or networking equipment where 12V or 48V mid-rails feed multiple downstream converters. IC Role / Device Role / Timing Role: Flexible controller supporting scalable MOSFET selection for optimized cost/performance trade-offs across load ranges. Use Value: External N-MOSFET drive allows use of ultra-low RDS(on) devices; programmable soft-start enables controlled power-up sequencing across multiple POL stages. |
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 |
|---|---|---|---|
| LTC3892EFE#PBF | Dual-output, 40V max input, 99% efficiency, integrated MOSFET drivers with phase modulation; requires external VREF for tracking. | Designed for multi-rail systems with tight cross-regulation; lacks reverse-current inhibit but adds current sharing capability. | Select when dual outputs or polyphase operation is required; not drop-in due to different pinout and feature set. |
| LM5116PWPR | 100V max input, 500kHz max frequency, no integrated VCC regulator, requires external bias supply; 1.5% regulation accuracy. | Targeted at ultra-high-input applications (e.g., solar MPPT, industrial HV); higher frequency enables smaller magnetics but increases EMI challenges. | Choose for >60V input or higher switching frequencies; verify external bias design and loop compensation compatibility. |
Compared with LTC3892EFE#PBF and LM5116PWPR, the LT3800IFE#PBF offers superior light-load efficiency via Burst Mode® and reverse-current inhibit, tighter 1% regulation, and integrated VCC regulation - making it optimal for 4–60V single-output systems prioritizing standby power and thermal simplicity over multi-phase complexity or ultra-high input voltage.
Availability
LT3800IFE#PBF is available at Aetrix Electronics and suitable for 48V telecom power supplies, industrial control systems, avionics power conversion, and distributed power architectures requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.
Supply support for LT3800IFE#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial automation, communications infrastructure, and aerospace markets.
The LT3800IFE#PBF belongs to Linear's high-voltage DC/DC controller product line, designed specifically for efficient, reliable step-down conversion in demanding industrial and telecom applications where wide input range, low quiescent current, and robust protection features are critical.
FAQ
What is the maximum input voltage rating for the LT3800IFE#PBF?
The LT3800IFE#PBF has an absolute maximum input voltage rating of 65V on the VIN pin, with recommended continuous operation up to 60V. Operation above 60V risks exceeding internal UVLO thresholds and may compromise reliability. The device is specifically characterized for stable performance from 4V to 60V, making it ideal for 48V telecom and industrial bus applications where transient tolerance is essential.
How does the LT3800IFE#PBF achieve low quiescent current in standby mode?
The LT3800IFE#PBF achieves sub-100μA quiescent current in standby via Burst Mode® operation, activated by pulling the BURST_EN pin below 0.5V. In this mode, the controller cycles between brief high-efficiency switching bursts and extended sleep periods, reducing average VIN current to under 100μA. Additionally, its precision SHDN pin enables a deep shutdown state drawing less than 10μA - both features are fully supported in the LT3800IFE#PBF variant across its –40°C to 125°C operating range.
Can the LT3800IFE#PBF drive both high-side and low-side N-channel MOSFETs simultaneously?
Yes, the LT3800IFE#PBF integrates two independent gate drivers - TG (top-gate) and BG (bottom-gate) - specifically designed to drive external N-channel MOSFETs in a synchronous buck configuration. TG uses internal dynamic bootstrap circuitry to sustain >9.8V gate-source voltage during high-side conduction, while BG directly drives the low-side MOSFET. Adaptive nonoverlap timing (150–200ns) prevents shoot-through, ensuring safe, efficient synchronous operation in the LT3800IFE#PBF.
What is the purpose of the exposed pad (Pin 17) on the LT3800IFE#PBF package?
The exposed pad on the LT3800IFE#PBF package is designated SGND (signal ground) and forms Pin 17. It is electrically connected to the internal signal ground plane and must be soldered to the PCB ground plane for optimal thermal dissipation and low-noise operation. Thermal resistance θJA is specified at 40°C/W only when this pad is properly soldered; omitting this connection degrades thermal performance and may cause premature thermal shutdown or parameter drift in the LT3800IFE#PBF.
Does the LT3800IFE#PBF support output voltages below 1.231V?
No, the LT3800IFE#PBF does not support output voltages below its internal 1.231V reference voltage because the VFB pin is the inverting input of an error amplifier referenced to that fixed voltage. Output voltage is calculated as VOUT = 1.231V × (1 + R2/R1), meaning the minimum achievable output is 1.231V (when R2 = 0). For sub-1.231V outputs, a different controller with adjustable reference or external reference injection would be required - the LT3800IFE#PBF is not designed for such configurations.
LT3800IFE#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
LT3800IFE#PBF FAQ
1.How can I place an order for LT3800IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3800IFE#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 LT3800IFE#PBF reliable?
The price and inventory of LT3800IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3800IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3800IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3800IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3800IFE#PBF?
LT3800IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3800IFE#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 LT3800IFE#PBF?
For technical support, including LT3800IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3800IFE#PBF requirements.
6.How does Aetrix verify that LT3800IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3800IFE#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 LT3800IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3800IFE#PBF?
All LT3800IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3800IFE#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 LT3800IFE#PBF part is unused and in its original packaging.
Return procedure for LT3800IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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