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Analog Devices Inc. LTC3813EG#PBF
- Part No.:
- LTC3813EG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3813EG#PBF.pdf
- Description:
- IC REG CTRLR BOOST 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:213
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Product details
Overview
LTC3813EG#PBF from Analog Devices (formerly Linear Technology) is a 100V synchronous step-up DC/DC controller IC that implements constant off-time peak current mode control without requiring an external sense resistor. It delivers ±0.5% output voltage regulation, supports up to 100V output, features 25MHz error amplifier bandwidth, and drives dual N-channel MOSFETs with 1Ω pulldown RDS(ON) gate drivers for high-current telecom power supplies.
For engineers reviewing the LTC3813EG#PBF datasheet, LTC3813EG#PBF pinout, LTC3813EG#PBF application, or LTC3813EG#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed 28-pin SSOP package mapping, real-world transient response data, and two rigorously cross-checked alternative controllers for high-voltage boost designs.
Technical Context
The LTC3813EG#PBF employs a constant off-time (COT) current mode architecture where top MOSFET on-time is set by a one-shot timer driven by IOFF current and VOFF voltage, enabling frequency adjustment from external resistors or synchronization to an external clock. Its 25MHz error amplifier enables sub-100ns load transient recovery with minimal output capacitance.
Protection includes cycle-by-cycle current limiting via VRNG-programmable sense threshold (70–384mV), ±10% PGOOD monitoring with 125μs delay, INTVCC UVLO at 6.2V, and VIN UVLO programmable via UVIN pin. Gate drivers deliver 1.5A peak source/sink with 1Ω pulldown RDS(ON), supporting parallel MOSFETs in 48V telecom and industrial systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Output Voltage | 100V - Enables single-stage boost from 12V/24V inputs to high-voltage rails for telecom base stations and industrial sensors. |
| Feedback Accuracy | ±0.5% at 0.8V reference - Ensures tight regulation across –40°C to 85°C ambient, critical for precision analog supply generation. |
| Error Amp Bandwidth | 25MHz - Delivers fast line/load transient response (<100μs recovery) without complex loop compensation. |
| Min Off-Time | 100ns - Supports high-frequency operation (>1MHz) at low input voltages, reducing inductor size in space-constrained designs. |
| Gate Driver RDS(ON) | 1Ω (BG/TG pulldown) - Minimizes MOSFET switching losses and enables direct drive of multiple paralleled Si7850DP devices. |
| INTVCC UVLO Threshold | 6.2V rising / 6.05V falling - Guarantees sufficient gate drive voltage before startup, preventing weak turn-on of 100V-rated MOSFETs. |
| Shutdown Current | 240μA - Reduces system standby power in battery-backed or energy-sensitive applications like remote IoT nodes. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), –40°C to 85°C operating temperature range, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IOFF (Pin 1) | Off-time current input | Sets switching frequency via external resistor to VOUT; enables VIN-compensated constant-frequency operation. |
| VOFF (Pin 4) | Off-time voltage input | Programs on-time comparator trip point (0.7V–2.4V); ties to VIN divider for input-voltage-stabilized frequency. |
| VRNG (Pin 5) | Sense voltage limit set | Configures current limit threshold (95–215mV default or 60–320mV programmable) for cycle-by-cycle protection. |
| PGOOD (Pin 6) | Power good open-drain output | Asserts low when VFB deviates >±10% for ≥125μs; interfaces directly with FPGA/CPU reset logic. |
| SYNC (Pin 7) | External clock input | Accepts 100kHz–1MHz external clock to synchronize switching and reduce EMI in noise-sensitive RF subsystems. |
| ITH (Pin 8) | Error amp compensation / current threshold | 0–2.6V control voltage sets peak inductor current; used for loop compensation and soft-start ramping. |
| VFB (Pin 9) | Feedback input | Connects to resistor divider from VOUT; internal 0.8V reference enables precise output voltage setting (e.g., 50V @ 63:1 divider). |
| SS (Pin 11) | Soft-start input | Capacitor-to-ground sets ramp rate of current limit threshold, preventing inrush current during startup. |
| SHDN (Pin 13) | Shutdown control | Pull below 1.5V to disable both MOSFETs and reduce quiescent current to 240μA for system-level power management. |
| UVIN (Pin 14) | Input undervoltage lockout | Resistor divider from VIN sets startup threshold (e.g., 10V UVLO with 0.8V internal reference and 12:1 divider). |
| NDRV (Pin 15) | External NMOS gate driver | Controls external pass device for INTVCC linear regulator; supports high-BVDSS MOSFETs for >15V input compatibility. |
| EXTVCC (Pin 16) | External driver supply | Switches internal LDO on at 6.7V; powers controller/driver from auxiliary supply to bypass INTVCC limitations. |
| INTVCC (Pin 17) | Main IC supply | 6.35–14V supply for internal circuitry; requires local 0.1μF bypass to SGND for stable reference operation. |
| DRVCC (Pin 18) | Driver supply | Supplies BG driver; tied to INTVCC in standard config; bypassed with 1μF X5R capacitor to BGRTN. |
| BG (Pin 19) | Bottom gate drive | Drives source of bottom N-MOSFET; swing from BGRTN to DRVCC; supports negative BGRTN for shoot-through prevention. |
| BGRTN (Pin 20) | Bottom gate return | Return path for BG driver; connect to ground or –2V supply to counteract Miller-effect gate pull-up during high dV/dt. |
| SENSE– (Pin 21) | Current sense negative input | Kelvin connection to bottom MOSFET source or sense resistor; enables accurate RDS(ON)-based current sensing. |
| SENSE+ (Pin 25) | Current sense positive input | Connects to SW node or top of sense resistor; completes differential current sense path for cycle-by-cycle limiting. |
| SW (Pin 26) | Switch node | Connects to inductor and bootstrap capacitor; voltage swings from –0.3V (Schottky drop) to VOUT; critical for layout EMI control. |
| TG (Pin 27) | Top gate drive | Floating driver for top N-MOSFET; powered from BOOST; returns to SW node for true high-side gate control. |
| BOOST (Pin 28) | Top gate driver supply | Charged via external diode from DRVCC; bypassed with 0.1μF X5R cap to SW; sustains TG drive during extended off-times. |
Key Features
| Feature | Design Value |
|---|---|
| No external current sense resistor required | Uses bottom MOSFET RDS(ON) for current sensing, eliminating sense resistor losses and PCB area in high-efficiency 48V telecom supplies. |
| Dual N-channel MOSFET synchronous drive | Eliminates Schottky diode conduction loss; enables >95% efficiency at 5A/50V output in typical 24V→50V telecom converter. |
| Adjustable off-time/frequency with tOFF(MIN) < 100ns | Supports >1MHz operation at low VIN, reducing inductor volume by 40% vs. 300kHz designs in space-constrained networking equipment. |
| Power Good output with ±10% window | Provides fail-safe system enable signal for downstream FPGAs or ADCs requiring strict rail integrity before initialization. |
| Programmable undervoltage lockout | UVIN pin allows custom VIN start/stop thresholds (e.g., 36V min for 48V nominal telecom input) to prevent brownout operation. |
| Output overvoltage protection | Immediately disables top MOSFET and latches bottom MOSFET on during OVP events, protecting 100V-rated capacitors and loads. |
Applications
| 48V Telecom Power Supply | Industrial Sensor Excitation |
|---|---|
Use Scenario: Generating stable 48V output from 24V battery backup in cellular base station power shelves. IC Role / Device Role / Timing Role: Synchronous step-up controller managing dual Si7850DP MOSFETs, regulating output with ±0.5% accuracy under 0–5A dynamic load. Use Value: Eliminates external sense resistor to achieve 96.2% peak efficiency at 3A, reducing thermal stress on PCB and extending field lifetime. | Use Scenario: Providing precise 36V excitation for piezoelectric pressure sensors in oil & gas downhole tools. IC Role / Device Role / Timing Role: High-voltage boost controller delivering regulated 36V from 12V vehicle battery, immune to engine cranking dips. Use Value: 25MHz error amplifier ensures <50μs recovery from 2A load transients, maintaining sensor signal integrity during rapid pressure changes. |
| Networking Equipment Midspan Power | Automotive ADAS Camera Power |
Use Scenario: Powering IEEE 802.3at PoE++ midspan injectors requiring 57V output from 48V input. IC Role / Device Role / Timing Role: Constant off-time controller synchronizing to system clock to suppress conducted EMI in dense switch fabric layouts. Use Value: SYNC pin enables deterministic 500kHz switching aligned with Ethernet PHY timing, reducing spectral overlap and easing EMC certification. | Use Scenario: Generating 12V bias for high-resolution automotive camera modules from 5V infotainment rail. IC Role / Device Role / Timing Role: Compact boost controller driving single Si7850DP in 28-SSOP footprint, meeting AEC-Q200 temperature requirements. Use Value: –40°C to 85°C rating and 100ns min off-time support cold-cranking operation while maintaining 12V ±3% regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-up controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3787EG#PBF | Fixed 300kHz frequency; no VOFF/IOFF frequency programming; supports up to 60V VOUT. | Lacks 100V capability and VIN-compensated frequency tuning; suited for lower-voltage, fixed-frequency PoE designs. | Select when board space permits larger inductors and 60V max output suffices; avoids complexity of LTC3813EG#PBF's programmable timing. |
| LM5122MMX/NOPB | Wide-input (3–75V) synchronous boost controller; 100V VOUT supported; uses average current mode, not COT. | Requires external sense resistor; slower transient response (10MHz EA vs 25MHz); different compensation network topology. | Choose for designs needing wider VIN range (e.g., 5–48V) and TI ecosystem support; accept trade-off in loop speed for simplified BOM. |
Compared with LTC3813EG#PBF, LTC3787EG#PBF offers simpler frequency setup but sacrifices 100V capability and adaptive timing, while LM5122MMX/NOPB extends input range at the cost of reduced transient performance and mandatory sense resistor use.
Availability
LTC3813EG#PBF is available at Aetrix Electronics and suitable for 48V telecom power supplies, industrial sensor excitation, networking equipment midspan power, and automotive ADAS camera power requiring stable component supply and long-term industrial lifecycle support.
Supply support for LTC3813EG#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3813EG#PBF belongs to Linear's high-voltage DC/DC controller product line, engineered specifically for efficient, reliable step-up conversion in telecom, industrial, and automotive systems demanding >60V output and robust fault protection.
FAQ
What is the maximum output voltage supported by the LTC3813EG#PBF?
The LTC3813EG#PBF supports a maximum output voltage of 100V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This enables single-stage boost conversion from common input rails like 12V or 24V to high-voltage outputs required in telecom base stations and industrial test equipment. The 100V rating applies across the full –40°C to 85°C operating temperature range specified for the LTC3813EG#PBF variant.
Does the LTC3813EG#PBF require an external current sense resistor?
No, the LTC3813EG#PBF does not require an external current sense resistor. It supports RDS(ON) current sensing using the bottom MOSFET's on-resistance, as documented in the Applications Information section. The VRNG pin configures the sense threshold (70–384mV), and SENSE+/SENSE– pins connect directly to the MOSFET drain/source for kelvin sensing. An external resistor is optional only if higher current-sense accuracy is needed.
What package type and temperature range does the LTC3813EG#PBF use?
The LTC3813EG#PBF uses a 28-lead plastic SSOP (G package) with lead-free finish and operates from –40°C to +85°C. This is explicitly stated in the Order Information table, where "LTC3813EG#PBF" is listed alongside "28-Lead Plastic SSOP" and "–40°C to 85°C". The 'E' grade designation confirms the commercial/industrial temperature range, distinct from the 'I' grade (–40°C to 125°C).
How is the switching frequency programmed on the LTC3813EG#PBF?
The switching frequency of the LTC3813EG#PBF is programmed via the IOFF pin (Pin 1) and VOFF pin (Pin 4). A resistor from VOUT to IOFF sets the one-shot timer current, while a resistive divider from VIN to VOFF makes off-time proportional to input voltage-enabling near-constant frequency across input variations. Frequency can also be synchronized to an external clock via the SYNC pin (Pin 7) for EMI-sensitive applications.
What protection features are integrated into the LTC3813EG#PBF?
The LTC3813EG#PBF integrates cycle-by-cycle current limiting (via VRNG-programmed threshold), output overvoltage protection (OVP) with immediate top-FET shutdown, ±10% PGOOD monitoring with 125μs delay, INTVCC undervoltage lockout (6.2V), and programmable VIN UVLO via the UVIN pin. These protections are detailed in the Fault Monitoring/Protection section and Electrical Characteristics tables, ensuring robust operation in harsh industrial and telecom environments.
LTC3813EG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 6.35V ~ 14V
- Frequency - Switching:
- -
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3813EG#PBF FAQ
1.How can I place an order for LTC3813EG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3813EG#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 LTC3813EG#PBF reliable?
The price and inventory of LTC3813EG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3813EG#PBF is usually 5 days.
3.What payment methods are accepted for LTC3813EG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3813EG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3813EG#PBF?
LTC3813EG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3813EG#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 LTC3813EG#PBF?
For technical support, including LTC3813EG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3813EG#PBF requirements.
6.How does Aetrix verify that LTC3813EG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3813EG#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 LTC3813EG#PBF meets industry standards.
7.What is the process for return or replacement of LTC3813EG#PBF?
All LTC3813EG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3813EG#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 LTC3813EG#PBF part is unused and in its original packaging.
Return procedure for LTC3813EG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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