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Analog Devices Inc. LT3800EFE#TRPBF
- Part No.:
- LT3800EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3800EFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,277
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Product details
Overview
LT3800EFE#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage synchronous current-mode step-down DC/DC controller IC driving external N-channel MOSFETs. It operates from 4V to 60V input, delivers up to 36V output, runs at fixed 200kHz frequency, and achieves <100μA no-load quiescent current with Burst Mode® enabled - ideal for 48V telecom power supplies and industrial distributed converters.
For engineers reviewing the LT3800EFE#TRPBF datasheet, LT3800EFE#TRPBF pinout, LT3800EFE#TRPBF application, or LT3800EFE#TRPBF 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, 1% regulation accuracy, and thermally enhanced 16-lead TSSOP package with exposed SGND pad.
Technical Context
The LT3800EFE#TRPBF implements a fixed-frequency (200kHz) current-mode control architecture with internal slope compensation, where peak inductor current is sensed differentially across SENSE+ and SENSE– pins with ±150mV threshold. Its error amplifier features 1.231V reference, 275–400μmhos transconductance, and rail-to-rail output swing on VC pin to modulate switch duty cycle.
Power sequencing is managed via CSS pin controlling output voltage slew rate using 2μA constant-current soft-start logic; BURST_EN pin independently enables/disables both Burst Mode operation (<100μA IQ) and reverse-current inhibit (discontinuous conduction). Gate drive outputs TG and BG incorporate dynamic bootstrap and adaptive nonoverlap timing (150–200ns) to ensure safe N-channel MOSFET switching.
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 |
| Operating Frequency | 200kHz (±10kHz) - fixed frequency enables predictable EMI filtering and stable loop compensation |
| No-Load Quiescent Current | <100μA with Burst Mode enabled - extends battery life in standby or low-power modes |
| Output Voltage Accuracy | ±1% over temperature - ensures precise regulation for sensitive downstream loads |
| Current Sense Threshold | ±150mV differential - provides accurate, temperature-stable current limiting independent of duty cycle |
| Soft-Start Control | 2μA constant-current CSS input - allows precise, adjustable output voltage ramp rate to limit inrush and overshoot |
| Shutdown Current | <10μA - enables ultra-low-power system-level sleep states |
Pinout & Package
LT3800EFE#TRPBF 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 (1) | Main input supply input | Accepts 4V–60V; powers internal regulator and gate drivers; UVLO starts at 7.5V |
| NC (2) | No connection | Unbonded; must remain floating |
| SHDN (3) | Precision enable/disable control | 1.35V rising threshold with 120mV hysteresis; pulls VIN current to <10μA in shutdown |
| CSS (4) | Soft-start timing control | 2μA constant-current sink; sets output voltage slew rate via external capacitor |
| BURST_EN (5) | Mode selection control | <0.5V enables Burst Mode + reverse-current inhibit; >2.5V disables both |
| VFB (6) | Error amplifier inverting input | Compares against 1.231V internal reference; programs output voltage via resistive divider |
| VC (7) | Error amplifier output | Drives current sense comparator threshold; integrator pole placement point for loop stability |
| SENSE– (8) | Negative current sense input | Differential pair with SENSE+; ±150mV threshold sets peak current limit |
| SENSE+ (9) | Positive current sense input | Completes differential sensing path; rejects common-mode noise up to 40V |
| PGND (10) | Power ground return | High-current return path for synchronous switch; separate from SGND to avoid noise coupling |
| BG (11) | Bottom gate driver output | Drives N-channel sync FET; 9.8V typical "ON" voltage via internal bootstrap |
| VCC (12) | Internal regulator output | 8V regulated supply; can be externally powered to reduce VIN dissipation |
| NC (13) | No connection | Unbonded; must remain floating |
| SW (14) | Switch node reference | Return for BOOST capacitor; referenced to PGND during bootstrapping |
| TG (15) | Top gate driver output | Drives high-side N-channel FET; synchronized with BG via nonoverlap logic |
| BOOST (16) | Bootstrapped supply input | Charged via diode from VCC/SW; supports up to 75V gate drive relative to SW |
| SGND (17) | Signal ground reference | Exposed pad; must be soldered to PCB ground plane for EMI and thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive nonoverlap circuitry | Prevents simultaneous TG/BG conduction (shoot-through) with 150–200ns dead time, ensuring MOSFET safety under all load and temperature conditions |
| Reverse inductor current inhibit | Disables synchronous rectification when inductor current approaches zero, enabling discontinuous conduction mode and improving light-load efficiency |
| Programmable soft-start with auto-reset | Controls output voltage rise time via CSS capacitor; re-engages if VFB drops below 0.3V (70% regulation), supporting brown-out recovery |
| Dynamic bootstrap gate drive | Maintains >9.8V gate-source voltage on high-side FET during continuous operation, minimizing RDS(on) losses and maximizing efficiency |
| Onboard VCC linear regulator | Generates 8V local supply from VIN; bypassable to allow external VCC sourcing and eliminate regulator power loss at high input voltages |
Applications
| 48V Telecom Power Supplies | Industrial Distributed Power Converters |
|---|---|
Use Scenario: Converting -48V or +48V telecom rack supply to intermediate 12V or 5V rails for line cards and baseband processing units. IC Role / Device Role / Timing Role: Primary step-down controller managing high-efficiency, high-reliability conversion with input UVLO and reverse-current protection. Use Value: 200kHz fixed frequency simplifies EMI filter design; 60V max input withstands telecom surge transients; <100μA Burst Mode IQ reduces standby power in idle slots. | Use Scenario: Generating isolated or non-isolated 3.3V/5V/12V rails from 24V or 48V factory automation bus in PLCs and I/O modules. IC Role / Device Role / Timing Role: High-voltage buck controller enabling compact, thermally efficient power stages with minimal external components. Use Value: 16-lead TSSOP with exposed SGND pad delivers superior thermal resistance (θJA = 40°C/W); reverse-current inhibit improves efficiency at partial loads typical in sensor networks. |
| Avionics Power Management | 12V/42V Automotive Heavy Equipment |
Use Scenario: Regulating 28V aircraft bus to 5V/3.3V for flight control computers and inertial measurement units (IMUs). IC Role / Device Role / Timing Role: Radiation-tolerant (by design), high-reliability DC/DC controller with precise 1% output regulation and robust UVLO hysteresis. Use Value: –40°C to 125°C operating range meets DO-160 environmental requirements; programmable soft-start prevents inrush-induced voltage droop on shared avionics buses. | Use Scenario: Powering infotainment, ADAS, or telematics modules from 12V or 42V vehicle batteries subject to cold-crank and load-dump events. IC Role / Device Role / Timing Role: Wide-input buck controller providing stable output despite battery voltage fluctuations from 4V (cold crank) to 60V (load dump). Use Value: Input UVLO with 670mV hysteresis ensures clean startup and shutdown; 10μA shutdown current preserves battery during extended parking periods. |
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 |
|---|---|---|---|
| LTC3890EMSE#PBF | Dual-output, 60V input, 2-phase capable; includes integrated LDO and PMBus interface; higher pin count and cost | Targeted at multi-rail systems requiring sequencing and telemetry; not drop-in compatible | Select LTC3890 when dual outputs, digital monitoring, or phase interleaving are required - not for single-rail simplicity |
| MP24894GQKT-Z | 40V max input, 300kHz fixed frequency, integrated MOSFETs; no external FET support or BOOST pin | Suitable only for lower-power, lower-input-voltage applications; lacks reverse-current inhibit and programmable soft-start | Choose MP24894 only for cost-sensitive, low-complexity designs under 40V input and ≤15W output |
Compared with LTC3890EMSE#PBF and MP24894GQKT-Z, the LT3800EFE#TRPBF uniquely balances wide 4V–60V input range, external N-FET flexibility, reverse-current inhibit, and ultra-low 100μA Burst Mode IQ - making it optimal for single-rail, high-efficiency industrial and telecom converters where thermal management and light-load performance are critical.
Availability
LT3800EFE#TRPBF is available at Aetrix Electronics and suitable for 48V telecom power supplies, industrial distributed power converters, avionics power management, and 12V/42V automotive heavy equipment requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT3800EFE#TRPBF 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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, formed through the acquisition of Linear Technology in 2017.
The LT3800EFE#TRPBF belongs to ADI's legacy Linear Technology high-voltage power controller product line, designed specifically for rugged, high-efficiency DC/DC conversion in industrial, telecom, and transportation systems demanding wide input range and low quiescent power.
FAQ
What is the maximum input voltage rating for the LT3800EFE#TRPBF?
The LT3800EFE#TRPBF has an absolute maximum input voltage rating of 65V on the VIN pin, with recommended continuous operation up to 60V. Its onboard UVLO circuit initiates startup at 7.5V (falling threshold 3.80V), and the device maintains regulation across the full 4V to 60V input range - making it suitable for harsh environments like telecom and automotive where load-dump transients occur.
How does the LT3800EFE#TRPBF achieve ultra-low quiescent current in no-load conditions?
The LT3800EFE#TRPBF achieves <100μA no-load quiescent current by enabling Burst Mode® operation via the BURST_EN pin. When BURST_EN is pulled below 0.5V, the controller cycles into low-power bursts only when output voltage droop requires correction, disabling most internal circuitry between pulses. This behavior is confirmed in the Electrical Characteristics table (IVIN = 20μA typ in Burst Mode) and validated across –40°C to 125°C.
Can the LT3800EFE#TRPBF drive both high-side and low-side N-channel MOSFETs simultaneously?
Yes, the LT3800EFE#TRPBF drives both high-side (TG pin) and low-side (BG pin) N-channel MOSFETs using adaptive nonoverlap circuitry that enforces minimum dead times of 150–200ns. This prevents shoot-through while maintaining high efficiency. The BOOST pin supplies the high-side gate driver, and the internal dynamic bootstrap ensures >9.8V gate-source voltage during normal switching - as specified in the Electrical Characteristics and Functional Diagram.
What is the purpose of the exposed pad (Pin 17) on the LT3800EFE#TRPBF package?
The exposed pad (Pin 17) on the LT3800EFE#TRPBF is designated SGND - a low-noise signal ground reference connected to the die substrate. Per the FE package drawing, it must be soldered to the PCB ground plane to ensure proper thermal dissipation (θJA = 40°C/W) and minimize EMI coupling into sensitive analog circuits like the error amplifier and current sense amplifier.
Does the LT3800EFE#TRPBF support output voltages higher than the internal 1.231V reference?
Yes, the LT3800EFE#TRPBF supports output voltages up to 36V using an external resistive divider from VOUT to VFB (Pin 6) and VFB to ground. The internal 1.231V reference is applied to the error amplifier's noninverting input; the divider ratio determines final output per R2 = R1 × (VOUT / 1.231 − 1). This method is explicitly detailed in the PIN FUNCTIONS section and validated in Typical Application circuits.
LT3800EFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT3800EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3800EFE#TRPBF 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#TRPBF reliable?
The price and inventory of LT3800EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3800EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3800EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3800EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3800EFE#TRPBF?
LT3800EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3800EFE#TRPBF 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#TRPBF?
For technical support, including LT3800EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3800EFE#TRPBF requirements.
6.How does Aetrix verify that LT3800EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3800EFE#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3800EFE#TRPBF?
All LT3800EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3800EFE#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT3800EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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