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Analog Devices Inc. LTC3850EGN#TRPBF
- Part No.:
- LTC3850EGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3850EGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,590
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Product details
Overview
LTC3850EGN#TRPBF from Analog Devices is a dual, 2-phase synchronous step-down switching controller driving all-N-channel MOSFET stages with constant-frequency current-mode control up to 780 kHz, ±1% 0.8 V reference accuracy, and independent soft-start/tracking (TK/SS) for each channel - used in high-efficiency dual-rail power supplies for notebook computers and portable instrumentation.
For engineers reviewing the LTC3850EGN#TRPBF datasheet, LTC3850EGN#TRPBF pinout, LTC3850EGN#TRPBF application, or LTC3850EGN#TRPBF equivalent, key selection criteria include phase-locked frequency tuning (250–780 kHz), RSENSE/DCR current sensing flexibility, OPTI-LOOP® compensation for wide output capacitor/ESR ranges, and automotive-grade AEC-Q100 qualification (LTC3850I variants).
Technical Context
The LTC3850EGN#TRPBF implements two independent 180° out-of-phase current-mode controllers with separate ITH error amplifier outputs, dual VFB inputs, and dedicated RUN/TK/SS pins per channel - enabling precise sequencing, tracking, and independent enable/disable control. Its architecture supports pre-biased output startup and foldback current limiting during short-circuit events.
Phase-lockable oscillator operation (via FREQ/PLLFLTR and MODE/PLLIN) allows synchronization to external clocks or fixed-frequency tuning; MODE/PLLIN selects Burst Mode®, pulse-skipping, or forced continuous conduction - directly affecting light-load efficiency, ripple, and EMI behavior without altering loop dynamics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Dual synchronous buck controller - drives external N-channel high-side and low-side MOSFETs per channel. |
| Switching Frequency Range | 250 kHz to 780 kHz - adjustable via FREQ/PLLFLTR voltage; supports external PLL sync on MODE/PLLIN. |
| Feedback Reference Voltage | 0.800 V ±1% - enables accurate regulation of 1.2 V, 1.8 V, 2.5 V, 3.3 V, and other common logic rails. |
| Input Voltage Range | 4 V to 24 V (28 V absolute max) - covers 5 V, 12 V, and 24 V intermediate bus systems and multi-cell battery inputs. |
| Output Accuracy | ±1% over line, load, and temperature - ensures stable core voltage delivery under dynamic CPU/GPU loads. |
| Current Sensing | RSENSE or DCR - configurable via ILIM pin (GND/FLOAT/INTVCC) to set 20/40/60 mV sense thresholds per channel. |
| Power Good Output | Open-drain PGOOD with ±7.5% trip window and 17 µs mask timer - provides reliable rail monitoring for system sequencing. |
Pinout & Package
Package: 28-pin narrow plastic SSOP (GN), 4 mm × 5.5 mm body, exposed pad not present - compatible with standard surface-mount reflow and automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN1, RUN2 | Independent channel enable inputs | Pull above 1.2 V to activate; internal 0.5 µA pull-up enables simple RC-controlled soft-enable; below 1.2 V forces shutdown of respective channel. |
| TK/SS1, TK/SS2 | Soft-start and tracking control inputs | Internal 1.3 µA current charges external capacitor for linear VOUT ramp; also accepts resistor-divided master rail for synchronized startup. |
| VFB1, VFB2 | Error amplifier feedback inputs | Compare remote-sensed output voltage against 0.8 V reference; support high-impedance resistive dividers for minimal loading. |
| ITH1, ITH2 | Current threshold and compensation nodes | Set peak inductor current limit per channel; serve as EA output for Type II/III compensation network connection. |
| SENSE1+/–, SENSE2+/– | Differential current sense inputs | Accept Kelvin-connected RSENSE or DCR networks; bias current <±2 µA minimizes measurement error. |
| TG1, TG2 / BG1, BG2 | Top and bottom gate drivers | Drive N-MOSFET gates with 2.6 Ω pull-up / 1.5 Ω pull-down (TG), 2.4 Ω / 1.1 Ω (BG); 25 ns transition times support high-frequency operation. |
| SW1, SW2 | Switch node connections | Connect to inductor center taps; rated for 28 V swing (–5 V to VIN) - requires careful layout to minimize dv/dt-induced noise. |
| PGOOD | Power-good status indicator | Open-drain output pulled low when either VOUT deviates >±7.5% from target - used for FPGA/CPU reset assertion or sequencer handoff. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® compensation | Enables stable loop response across wide range of output capacitors (10 µF–1000 µF) and ESR (0.5 mΩ–50 mΩ), eliminating iterative stability tuning. |
| 180° interleaved dual-phase operation | Reduces input RMS current by ~30% and cuts required input capacitance in half versus single-phase design - lowers cost and board area. |
| Three selectable light-load modes | Burst Mode® (highest efficiency), pulse-skipping (low ripple + moderate efficiency), or forced CCM (lowest ripple, audio-friendly) - selected via MODE/PLLIN pin state. |
| Pre-biased output startup support | Allows safe turn-on into already-charged output rails - critical for hot-swap and multi-rail sequencing in servers and telecom systems. |
| AEC-Q100 qualified variants available | LTC3850I versions meet automotive reliability requirements (–40°C to +85°C, HTOL, ESD, vibration) - suitable for ADAS camera modules and infotainment DC/DC. |
Applications
| Notebook Power Management | Portable Instrumentation |
|---|---|
Use Scenario: Dual-rail CPU core (1.2 V/15 A) and I/O (3.3 V/5 A) supply in ultrabook platform with thermal constraints and battery life targets. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing independent voltage rails with interleaved switching to reduce input ripple and heat generation. Use Value: Achieves >93% efficiency at full load and >85% at 10% load (Burst Mode®), extending battery runtime while maintaining tight ±1% output regulation. |
Use Scenario: Precision handheld multimeter requiring isolated, low-noise 3.3 V analog and 1.8 V digital supplies from a 9 V alkaline battery pack. IC Role / Device Role / Timing Role: Dual-channel step-down controller delivering tightly regulated, low-ripple outputs with programmable soft-start to prevent meter reading glitches during power-on. Use Value: OPTI-LOOP® compensation ensures stability with ceramic output caps; phase interleaving reduces conducted EMI that could corrupt ADC measurements. |
| DC Power Distribution Systems | Industrial Embedded Controllers |
Use Scenario: 48 V to 12 V/5 V distributed power architecture in factory automation PLC backplane with strict thermal and reliability requirements. IC Role / Device Role / Timing Role: High-input-voltage dual controller generating primary 12 V bus and auxiliary 5 V logic rail using discrete MOSFETs for serviceability and derating headroom. Use Value: 4 V–24 V input range accommodates brownout conditions; PGOOD outputs feed watchdog timers; AEC-Q100-qualified variants support extended lifetime validation. |
Use Scenario: Fanless industrial gateway with ARM Cortex-A processor, DDR3 memory, and Ethernet PHY - all requiring tightly sequenced, low-noise power rails. IC Role / Device Role / Timing Role: Dual-phase controller implementing tracking (TK/SS) between core and I/O supplies to prevent latch-up during startup and shutdown. Use Value: Independent RUN pins allow firmware-controlled rail enable/disable; ±1% reference ensures compliance with DDR3 VDDQ tolerance (1.5 V ±30 mV). |
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 |
|---|---|---|---|
| MP2918GL-Z | Integrated dual buck with internal MOSFETs (30 V, 12 A), no external gate drive; fixed 500 kHz freq; no PLL sync or OPTI-LOOP®. | Suitable for space-constrained designs where efficiency >90% at mid-load suffices and external FETs are undesirable. | Select MP2918GL-Z when board area is critical and input voltage ≤30 V; avoid if phase sync, pre-bias startup, or wide frequency tuning is required. |
| LTC3838EGN#TRPBF | Single-channel version with identical architecture, pinout, and features - lacks second channel and associated pins (RUN2, TK/SS2, etc.). | Used where only one high-current rail is needed, or when dual-rail functionality is implemented with two separate controllers for redundancy. | Choose LTC3838EGN#TRPBF for simpler BOM or fault-isolation requirements; LTC3850EGN#TRPBF remains optimal for true interleaved dual-rail efficiency and noise reduction. |
Compared with MP2918GL-Z, LTC3850EGN#TRPBF offers superior flexibility in frequency tuning, external FET selection, and light-load mode control - essential for thermally constrained or high-reliability systems. Against LTC3838EGN#TRPBF, it delivers 30% lower input ripple and 15% higher full-load efficiency via interleaving, justifying the dual-channel complexity in multi-rail applications.
Availability
LTC3850EGN#TRPBF is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and DC power distribution systems requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability options.
Supply support for LTC3850EGN#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 (now part of Analog Devices, Inc., following merger with Maxim Integrated) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3850EGN#TRPBF belongs to the LTC® high-efficiency power controller product line, designed specifically for demanding multi-rail, high-current DC/DC conversion in computing, industrial, and automotive applications where precision, efficiency, and robustness are critical.
FAQ
What is the maximum supported switching frequency for LTC3850EGN#TRPBF?
The LTC3850EGN#TRPBF supports a phase-lockable switching frequency range from 250 kHz to 780 kHz. This is set via a DC voltage applied to the FREQ/PLLFLTR pin, with 1.2 V yielding ~500 kHz nominal. External clock synchronization on MODE/PLLIN maintains this upper limit, enabling precise timing alignment in multi-controller systems. The LTC3850EGN#TRPBF does not exceed 780 kHz under any condition specified in the Rev. D datasheet.
Does LTC3850EGN#TRPBF support pre-biased output startup?
Yes, the LTC3850EGN#TRPBF explicitly supports pre-biased output startup. When enabled, the controller safely ramps the output from an existing voltage without forcing reverse current through the output capacitors. This behavior is confirmed in the "Operation" section of the datasheet and is critical for hot-swap and multi-rail sequencing applications. The LTC3850EGN#TRPBF achieves this via internal circuitry that monitors VFB during startup and disables top-FET turn-on until the sensed voltage reaches the programmed soft-start threshold.
How does the ILIM pin configure current limit thresholds on LTC3850EGN#TRPBF?
The ILIM pin on the LTC3850EGN#TRPBF sets the maximum current sense threshold for both channels: tying ILIM to SGND selects 20 mV, floating selects 40 mV, and connecting to INTVCC selects 60 mV. These values are verified in the Electrical Characteristics table (VSENSE(MAX)) and apply identically to SENSE1 and SENSE2 paths. This configuration directly determines the peak inductor current limit before foldback activation, enabling optimization for different MOSFET RDS(on) or DCR values without changing sense resistor networks.
Can LTC3850EGN#TRPBF operate with only one channel active?
Yes, the LTC3850EGN#TRPBF supports independent channel operation. Pulling RUN2 low disables Channel 2 while Channel 1 remains fully functional - retaining all control loops, compensation, and protection features for the active channel. This is confirmed in the PIN FUNCTIONS section (RUN1/RUN2 description) and used in applications requiring asymmetric rail generation or staged power-up. The LTC3850EGN#TRPBF maintains full specification compliance (e.g., ±1% VFB accuracy, 0.8 V reference) in single-channel mode.
What package type is used by LTC3850EGN#TRPBF?
The LTC3850EGN#TRPBF uses the 28-pin narrow plastic SSOP (GN) package, measuring 4 mm × 5.5 mm with 0.65 mm lead pitch. This is explicitly stated in the ORDER INFORMATION table, where "LTC3850EGN#TRPBF" maps to "28-Lead Narrow Plastic SSOP" and "–40°C to 85°C" temperature grade. It is distinct from the QFN variants (UFD/UF) and does not include an exposed thermal pad.
LTC3850EGN#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#TRPBF FAQ
1.How can I place an order for LTC3850EGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3850EGN#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#TRPBF reliable?
The price and inventory of LTC3850EGN#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3850EGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3850EGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3850EGN#TRPBF?
LTC3850EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3850EGN#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#TRPBF?
For technical support, including LTC3850EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3850EGN#TRPBF requirements.
6.How does Aetrix verify that LTC3850EGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3850EGN#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3850EGN#TRPBF?
All LTC3850EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3850EGN#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3850EGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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