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Analog Devices Inc. LTC3850EGN-1#TRPBF
- Part No.:
- LTC3850EGN-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3850EGN-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,272
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Product details
Overview
LTC3850EGN-1#TRPBF from Analog Devices is a dual, 2-phase synchronous step-down switching controller driving all-N-channel MOSFET stages, featuring phase-lockable 250–780 kHz operation, ±1% 0.8 V reference accuracy, and independent soft-start/tracking (TK/SS) pins for coordinated voltage ramping - used in high-efficiency 3.3 V/2.5 V DC-DC converters for portable computing and battery-powered instrumentation.
For engineers reviewing the LTC3850EGN-1#TRPBF datasheet, LTC3850EGN-1#TRPBF pinout, LTC3850EGN-1#TRPBF application, or LTC3850EGN-1#TRPBF equivalent, key selection considerations include its dual-channel current-mode architecture, EXTVCC-enabled power efficiency optimization, RSENSE/DCR sensing flexibility, and AEC-Q100-qualified variants for automotive-grade reliability validation.
Technical Context
The LTC3850EGN-1#TRPBF implements two independent constant-frequency current-mode control loops operating 180° out-of-phase to reduce input ripple and EMI. Each channel uses an error amplifier with OPTI-LOOP® compensation, a precision 0.8 V reference, and ITH-controlled peak current limiting with foldback protection.
Its MODE/PLLIN pin selects among Burst Mode®, pulse-skipping, or forced continuous conduction, while FREQ/PLLFLTR enables frequency programming or external clock synchronization. The EXTVCC pin (present only on -1 variants) bypasses the internal 5 V LDO to improve efficiency when supplied from a regulated rail ≥4.7 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Dual synchronous buck controller - drives external N-MOSFET pairs per channel without integrated power switches. |
| Switching Frequency | 250–780 kHz, adjustable via FREQ/PLLFLTR voltage or external clock sync - enables trade-off between efficiency and magnetics size. |
| Reference Voltage | 0.800 V ±1% over temperature - ensures tight output regulation for 1.8 V, 2.5 V, 3.3 V rails in multi-rail systems. |
| Input Voltage Range | 4 V to 24 V (28 V absolute max) - supports wide-range battery chemistries and intermediate bus voltages. |
| Current Sensing | RSENSE or DCR-based - configurable via ILIM pin (GND/FLOAT/INTVCC) to set max sense threshold at 20/40/60 mV. |
| Soft-Start/Tracking | Independent TK/SS1/TK/SS2 pins with 1.3 µA internal charge current - enables programmable ramp rate or master-slave voltage coordination. |
| Power Good Output | Open-drain PGOOD with ±7.5% trip window and 17 µs mask timer - provides reliable system-level power sequencing feedback. |
Pinout & Package
Package: 28-pin narrow plastic SSOP (GN), 4 mm × 5.5 mm body, exposed pad not present - suitable for space-constrained industrial and portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN1, RUN2 | Channel enable inputs | Independent shutdown control: >1.22 V enables; <1.1 V disables - supports staggered startup and fault isolation. |
| TK/SS1, TK/SS2 | Soft-start and tracking inputs | Internal 1.3 µA current charges external capacitor - sets linear VOUT ramp time or replicates master supply trajectory. |
| SENSE1+/SENSE1−, SENSE2+/SENSE2− | Differential current sense inputs | Accepts RSENSE or DCR network signals - enables accurate peak-current mode control with selectable full-scale thresholds. |
| VFB1, VFB2 | Error amplifier feedback inputs | Compare remote output voltage against 0.8 V reference - supports resistive divider networks for precise output setting. |
| EXTVCC | External bias supply input | Enables bypass of internal 5 V LDO when ≥4.7 V applied - reduces power loss and thermal load in high-current designs. |
| MODE/PLLIN | Mode select & PLL sync input | Selects Burst Mode® (float), pulse-skip (INTVCC), or forced CCM (GND); accepts external clock for synchronization. |
| FREQ/PLLFLTR | Oscillator frequency control | DC voltage sets nominal frequency (250–780 kHz); also serves as PLL loop filter node when synchronized externally. |
| PGOOD | Power-good status indicator | Open-drain output pulled low if either VOUT deviates >±7.5% - used for system reset or sequencer handshaking. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® compensation | Enables stable loop response across wide range of output capacitance and ESR - eliminates need for iterative compensation redesign. |
| 180° interleaved dual-phase operation | Halves effective input ripple current and reduces required bulk capacitance - lowers EMI and improves input filter lifetime. |
| Pre-biased output start-up support | Allows safe turn-on into pre-charged output rails - prevents reverse current flow and avoids system brownout during hot-swap events. |
| Current foldback limiting | Reduces MOSFET stress under short-circuit by lowering peak current threshold - enhances robustness without external circuitry. |
| AEC-Q100 qualification (I-grade) | Validated for automotive temperature range (–40°C to +105°C) and reliability testing - enables use in infotainment and ADAS subsystems. |
Applications
| High-Efficiency Notebook Power | Portable Test Instrumentation |
|---|---|
|
Use Scenario: Dual-rail 3.3 V/2.5 V conversion powering CPU core logic and I/O interfaces in ultra-thin notebooks. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing independent output regulation, sequencing, and dynamic load response. Use Value: 95% peak efficiency and interleaved ripple reduction extend battery runtime while minimizing thermal design constraints. |
Use Scenario: Precision analog front-end and digital processing subsystems in handheld oscilloscopes and multimeters. IC Role / Device Role / Timing Role: Dual-channel controller delivering low-noise, tightly regulated supplies with programmable soft-start for measurement stability. Use Value: ±1% reference accuracy and Burst Mode® operation ensure clean analog rails and extended standby battery life. |
| Automotive Infotainment | Industrial DC Distribution |
|
Use Scenario: Powering display controllers and audio codecs in vehicle head units under varying battery conditions (9–16 V). IC Role / Device Role / Timing Role: AEC-Q100-qualified dual controller supporting wide VIN, pre-biased start-up, and robust fault handling. Use Value: EXTVCC capability and 30 V absolute max VIN rating enable direct connection to automotive battery rails with minimal external components. |
Use Scenario: Distributed 5 V/3.3 V point-of-load conversion in programmable logic controllers and sensor hubs. IC Role / Device Role / Timing Role: Interleaved controller providing high-current, low-ripple outputs with independent enable and tracking for modular power architecture. Use Value: Independent RUN/TK/SS pins allow flexible sequencing across multiple subsystems, reducing system-level BOM and layout complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3850IGN-1#TRPBF | Same functionality and pinout; rated for –40°C to +105°C industrial temperature range with AEC-Q100 compliance. | Required for automotive environments where extended temperature and reliability validation are mandatory. | Select when automotive qualification or extended thermal margin is needed; otherwise LTC3850EGN-1#TRPBF suffices for commercial applications. |
| MP2918GL-Z | Single-chip dual-phase controller with integrated MOSFET drivers only - no EXTVCC option, fixed 500 kHz frequency, no PLL sync. | Suitable for cost-sensitive, space-constrained designs where external MOSFETs are not required and frequency flexibility is secondary. | Choose MP2918GL-Z only if integrated drivers meet current requirements and EXTVCC optimization is unnecessary. |
Compared with LTC3850EGN-1#TRPBF, the LTC3850IGN-1#TRPBF adds automotive-grade reliability and extended temperature operation without changing pinout or feature set, while MP2918GL-Z trades configurability and efficiency optimization for integration and lower component count in less demanding applications.
Availability
LTC3850EGN-1#TRPBF is available at Aetrix Electronics and suitable for high-efficiency notebook power, portable instrumentation, and industrial DC distribution requiring stable component supply and long-term production continuity.
Supply support for LTC3850EGN-1#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 is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets with precision, reliability, and innovation.
The LTC3850 product line delivers dual-phase synchronous buck controllers optimized for high-efficiency, low-noise, and thermally efficient multi-rail power conversion in portable, automotive, and industrial systems.
FAQ
What is the function of the EXTVCC pin on the LTC3850EGN-1#TRPBF?
The EXTVCC pin on the LTC3850EGN-1#TRPBF allows bypassing of the internal 5 V LDO regulator when supplied with ≥4.7 V, reducing power loss and heat generation. This feature is exclusive to the -1 variant and enables higher efficiency when powered from a clean, regulated auxiliary rail - a key differentiator versus non–1 versions like LTC3850EGN#TRPBF.
How does the LTC3850EGN-1#TRPBF support voltage tracking between its two output channels?
The LTC3850EGN-1#TRPBF supports voltage tracking via its independent TK/SS1 and TK/SS2 pins: one channel is configured as master (with capacitor-to-ground for soft-start ramp), and the other as slave (with resistor divider from master VOUT to TK/SS2). This ensures monotonic, coordinated startup - critical for FPGA or processor core/I/O rail sequencing in the LTC3850EGN-1#TRPBF application.
What are the supported current sensing methods for the LTC3850EGN-1#TRPBF?
The LTC3850EGN-1#TRPBF supports both RSENSE (shunt resistor) and DCR (inductor winding resistance) current sensing. The ILIM pin configures the maximum sense threshold to 20 mV (ILIM = GND), 40 mV (ILIM = FLOAT), or 60 mV (ILIM = INTVCC), enabling optimal signal-to-noise ratio and loss trade-offs per application - a capability confirmed in the LTC3850EGN-1#TRPBF electrical characteristics table.
Can the LTC3850EGN-1#TRPBF operate with pre-biased outputs during startup?
Yes, the LTC3850EGN-1#TRPBF supports pre-biased output start-up, preventing reverse current flow when enabled into an already charged rail. This behavior is enabled by default and requires no external components - verified in the "Operation" section of the LTC3850EGN-1#TRPBF datasheet and essential for hot-swap and redundant power systems.
What is the purpose of the MODE/PLLIN pin on the LTC3850EGN-1#TRPBF?
The MODE/PLLIN pin on the LTC3850EGN-1#TRPBF selects operating mode (Burst Mode®, pulse-skipping, or forced continuous conduction) and serves as the phase detector input for external clock synchronization. Tying it to SGND forces CCM; to INTVCC enables pulse-skipping; floating enables Burst Mode® - giving designers direct control over light-load efficiency vs. noise trade-offs in the LTC3850EGN-1#TRPBF implementation.
LTC3850EGN-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 24V
- Frequency - Switching:
- 250kHz ~ 780kHz
- Duty Cycle (Max):
- 97.2%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3850EGN-1#TRPBF FAQ
1.How can I place an order for LTC3850EGN-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3850EGN-1#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 LTC3850EGN-1#TRPBF reliable?
The price and inventory of LTC3850EGN-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3850EGN-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3850EGN-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3850EGN-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3850EGN-1#TRPBF?
LTC3850EGN-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3850EGN-1#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 LTC3850EGN-1#TRPBF?
For technical support, including LTC3850EGN-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3850EGN-1#TRPBF requirements.
6.How does Aetrix verify that LTC3850EGN-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3850EGN-1#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 LTC3850EGN-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3850EGN-1#TRPBF?
All LTC3850EGN-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3850EGN-1#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 LTC3850EGN-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3850EGN-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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