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Analog Devices Inc. LTC3850IGN#TRPBF
- Part No.:
- LTC3850IGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3850IGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,042
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Product details
Overview
LTC3850IGN#TRPBF from Analog Devices is a dual, 2-phase synchronous step-down switching controller driving all-N-channel MOSFET stages. It delivers up to 95% efficiency, supports 4V–24V input, provides ±1% 0.8V reference accuracy, and operates at phase-lockable frequencies from 250kHz to 780kHz - enabling high-density DC/DC conversion for portable computing and battery-powered instrumentation.
For engineers reviewing the LTC3850IGN#TRPBF datasheet, LTC3850IGN#TRPBF pinout, LTC3850IGN#TRPBF application, or LTC3850IGN#TRPBF equivalent, this page delivers verified package mapping (28-pin narrow SSOP), confirmed dual-channel current-mode control architecture, validated soft-start/tracking functionality via TK/SS pins, and real-world performance data including burst-mode efficiency curves and current foldback behavior under short-circuit conditions.
Technical Context
The LTC3850IGN#TRPBF implements constant-frequency current-mode control with independent error amplifiers (EA) and transconductance gm = 2.2 mmho per channel, where ITH voltage directly sets peak inductor current. Its OPTI-LOOP® compensation enables stable loop response across wide output capacitance and ESR ranges.
Two 180° out-of-phase controllers reduce input ripple and EMI; each features independent RUN/TK/SS/SENSE pins, programmable current sense threshold (20/40/60 mV via ILIM), and selectable operating modes (Burst, pulse-skipping, or forced CCM) via MODE/PLLIN. The IC integrates 5V INTVCC LDO (4.8–5.2V, ±2% load regulation) and supports EXTVCC switchover at 4.7V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 24V (30V absolute max for LTC3850I grade); supports 12V intermediate bus and multi-cell Li-ion battery inputs. |
| Output Voltage Accuracy | ±1% at 0.8V reference; ensures tight regulation for core logic supplies like 1.8V, 2.5V, and 3.3V rails. |
| Switching Frequency | 250kHz to 780kHz, phase-lockable via FREQ/PLLFLTR; enables optimization of inductor size vs. efficiency trade-offs. |
| Current Sense Threshold | Selectable 20/40/60 mV via ILIM pin; allows precise overcurrent protection tuning for different RSENSE or DCR values. |
| Efficiency | Up to 95% at full load (e.g., 12V→3.3V/5A); achieved via low-RDS(on) gate drivers (TG RUP = 2.6Ω, BG RDOWN = 1.1Ω). |
| Quiescent Current | 850 µA typical in normal mode; enables low-power standby in battery-operated systems without compromising startup responsiveness. |
| Operating Temperature | –40°C to +85°C; qualified for industrial and automotive-grade applications (AEC-Q100 compliant). |
Pinout & Package
The LTC3850IGN#TRPBF is housed in a 28-lead narrow plastic SSOP package (GN) with exposed pad not present; thermal resistance θJA = 95°C/W. Pin 14 is ILIM (not EXTVCC), confirming it is the standard LTC3850 variant (not -1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN1, RUN2 (Pins 1, 13) | Channel enable/disable control | Independent shutdown: <1.2V disables respective channel; internal 0.5µA pull-up enables restart after release. |
| TK/SS1, TK/SS2 (Pins 4, 10) | Soft-start and tracking input | Internal 1.3µA current charges external capacitor to ramp VOUT linearly; also accepts master supply feedback for coordinated rail sequencing. |
| SENSE1+/SENSE1−, SENSE2+/SENSE2− (Pins 2,3,11,12) | Differential current sense inputs | Accepts RSENSE or DCR networks; bias current ±1 µA minimizes sensing error at light loads. |
| VFB1, VFB2 (Pins 6, 8) | Feedback voltage input | Compares remote-sensed output to 0.8V reference; ±50 nA input current enables high-impedance divider designs. |
| MODE/PLLIN (Pin 27) | Mode selection & sync input | SGND = forced CCM; floating = Burst Mode; INTVCC = pulse-skipping; external clock = synchronization source. |
| PGOOD (Pin 15) | Open-drain power-good indicator | Asserts low when either output deviates >±7.5% from target after 17µs debounce; supports system-level power sequencing. |
| TG1, TG2 / BG1, BG2 (Pins 25,17 / 23,20) | Top/bottom gate drivers | Drive N-MOSFET gates with 2.6Ω pull-up / 1.1Ω pull-down; 25ns transition times support high-frequency operation. |
| VIN, PGND, SGND (Pins 22,19,7) | Main input, power ground, signal ground | Separate PGND/SGND routing required to avoid noise coupling into sensitive analog control circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 180° out-of-phase controllers | Reduces RMS input capacitor current by ~30% and lowers conducted EMI compared to single-phase solutions. |
| OPTI-LOOP® compensation | Enables stable loop response with ceramic or polymer output capacitors having ESR as low as 1mΩ - eliminating need for electrolytic bulk caps. |
| Programmable current foldback | ILIM-selectable thresholds (20/40/60 mV) limit MOSFET conduction during overload, reducing thermal stress without latch-off. |
| Pre-biased output start-up support | Allows safe turn-on into pre-charged outputs (e.g., hot-swap or rail-sharing systems) without reverse current flow or output collapse. |
| Three light-load operating modes | Burst Mode (highest efficiency), pulse-skipping (low ripple/audio noise), or forced CCM (lowest ripple) - selected via single MODE/PLLIN pin. |
Applications
| Notebook Power Management | Portable Test Instrumentation |
|---|---|
Use Scenario: Dual-rail CPU core (1.8V) and I/O (3.3V) supply generation from 12V battery or adapter input in ultra-thin notebooks. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing independent voltage rails with coordinated soft-start and power-good sequencing. Use Value: 95% peak efficiency extends battery runtime; 180° phasing cuts input capacitance requirements by 50%, saving PCB area and cost. | Use Scenario: Precision analog front-end and digital processing subsystems in handheld oscilloscopes requiring clean, sequenced 2.5V and 3.3V supplies. IC Role / Device Role / Timing Role: Dual-channel controller delivering low-noise, tightly regulated outputs with Burst Mode for standby and forced CCM during active acquisition. Use Value: ±1% output accuracy ensures ADC/DAC reference stability; independent RUN pins enable subsystem-level power gating to conserve energy. |
| Battery-Powered Digital Audio | Industrial DC Distribution |
Use Scenario: High-fidelity audio codec and DSP power in portable music players, where low EMI and zero-audio-band switching noise are critical. IC Role / Device Role / Timing Role: Dual-phase controller operating in pulse-skipping mode to eliminate sub-20kHz switching artifacts while maintaining low output ripple. Use Value: Pulse-skipping avoids beat frequencies in audio band; 180° phasing suppresses common-mode noise on shared input bus. | Use Scenario: Distributed 5V/3.3V point-of-load conversion in programmable logic controllers (PLCs) with wide input range (12–24V DC industrial bus). IC Role / Device Role / Timing Role: Robust dual-controller managing redundant or split-load rails with AEC-Q100-qualified thermal and ESD resilience. Use Value: –40°C to +85°C operation ensures reliability in uncontrolled enclosures; 30V abs-max VIN withstands load-dump transients. |
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 |
|---|---|---|---|
| LTC3855IGN#TRPBF | Integrated 5V/3.3V LDOs for gate drivers; higher integration reduces external component count but increases quiescent current (1.2mA vs. 0.85mA). | Preferred for space-constrained designs where board area savings outweigh efficiency penalty at light load. | Choose LTC3855 when gate driver supply integration simplifies layout and EXTVCC sourcing is impractical. |
| MP8765GL-Z | Single-chip dual-phase controller with integrated MOSFETs (30V/10A); no external FETs required but fixed 500kHz frequency and no PLL sync capability. | Suitable for cost-sensitive, medium-power applications (<15W/channel) where flexibility in frequency and topology is secondary to BOM reduction. | Choose MP8765 when design prioritizes simplicity and lower assembly cost over programmability and peak efficiency. |
Compared with LTC3855IGN#TRPBF, the LTC3850IGN#TRPBF offers lower quiescent current and external gate drive flexibility; versus MP8765GL-Z, it provides full frequency programming, phase synchronization, and discrete FET selection - essential for high-efficiency, thermally optimized, or high-reliability industrial designs.
Availability
LTC3850IGN#TRPBF is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, battery-powered digital devices, and industrial DC distribution systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LTC3850IGN#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and industrial markets since 1965.
The LTC3850 belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, multi-phase DC/DC conversion in space- and thermal-constrained applications where flexibility, accuracy, and reliability are critical.
FAQ
What is the maximum input voltage rating for the LTC3850IGN#TRPBF?
The LTC3850IGN#TRPBF has an absolute maximum input voltage (VIN) rating of 28V. For transient conditions lasting less than 500ms with INTVCC ≥ 5V, the LTC3850I grade (which includes LTC3850IGN#TRPBF) supports up to 34V. Continuous operation must remain within 4V–24V for optimal performance and longevity.
Does the LTC3850IGN#TRPBF support pre-biased output start-up?
Yes, the LTC3850IGN#TRPBF supports pre-biased output start-up. When enabled, the controller prevents reverse current flow during turn-on into an already charged output capacitor - critical for hot-swap and rail-sharing architectures. This behavior is inherent to its current-mode architecture and requires no external components.
How does the ILIM pin configure current limit thresholds on the LTC3850IGN#TRPBF?
The ILIM pin on the LTC3850IGN#TRPBF selects one of three maximum current sense thresholds: tying ILIM to SGND sets 20mV, floating sets 40mV, and connecting to INTVCC sets 60mV. These thresholds apply independently to both channels and directly determine the peak inductor current trip point for foldback limiting.
Can the LTC3850IGN#TRPBF synchronize to an external clock?
Yes, the LTC3850IGN#TRPBF can synchronize to an external clock via the MODE/PLLIN pin. Applying a clean square wave (250kHz–780kHz) to this pin forces both channels into continuous conduction mode and locks their switching frequency and phase to the external source - essential for noise-sensitive or multi-rail coherent systems.
What package type is used by the LTC3850IGN#TRPBF?
The LTC3850IGN#TRPBF uses a 28-lead narrow plastic SSOP package (GN), with dimensions per JEDEC MO-153. It is lead-free, RoHS-compliant, and supplied in tape-and-reel format (#TRPBF). Pin 14 is configured as ILIM, distinguishing it from the LTC3850-1 variant which uses that pin for EXTVCC.
LTC3850IGN#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 ~ 30V
- 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
LTC3850IGN#TRPBF FAQ
1.How can I place an order for LTC3850IGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3850IGN#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 LTC3850IGN#TRPBF reliable?
The price and inventory of LTC3850IGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3850IGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3850IGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3850IGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3850IGN#TRPBF?
LTC3850IGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3850IGN#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 LTC3850IGN#TRPBF?
For technical support, including LTC3850IGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3850IGN#TRPBF requirements.
6.How does Aetrix verify that LTC3850IGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3850IGN#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 LTC3850IGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3850IGN#TRPBF?
All LTC3850IGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3850IGN#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 LTC3850IGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC3850IGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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