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Analog Devices Inc. LTC1876EG#TRPBF
- Part No.:
- LTC1876EG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 36-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1876EG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,288
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Product details
Overview
LTC1876EG#TRPBF from Analog Devices (formerly Linear Technology) is a triple-output synchronous switching regulator IC integrating two out-of-phase 5V/3.3V step-down controllers and one 1.2MHz 34V step-up regulator with internal 1A switch. It delivers up to 4A at 5V, 5A at 3.3V, and 200mA at 12V in notebook power systems, featuring OPTI-LOOP™ compensation, 99% duty cycle dropout operation, and dual RUN/SS pins for independent soft-start and latched short-circuit shutdown.
For engineers reviewing the LTC1876EG#TRPBF datasheet, LTC1876EG#TRPBF pinout, LTC1876EG#TRPBF application, or LTC1876EG#TRPBF equivalent, key selection considerations include its dual-phase step-down architecture reducing input capacitance, integrated 3.3V linear standby regulator, forced continuous/Burst Mode™ selectability via FCB pin, and 36V absolute max VIN rating for industrial input rail tolerance.
Technical Context
The LTC1876EG#TRPBF implements current-mode control across all three regulators: two synchronized but 180° out-of-phase step-down channels using external N-MOSFETs (TG1/BG1, TG2/BG2), and an independent fixed-frequency 1.2MHz boost stage with internal 1A/36V switch. Each step-down channel features programmable 150–300kHz switching frequency via FREQSET, 0.800V ±0.8% feedback reference, and ITH-based peak-current regulation.
Its protection architecture includes overvoltage latch-on of bottom MOSFETs (VOSENSE trip at ±7.5%), current foldback limiting, timed short-circuit shutdown via RUN/SS discharge, and undervoltage lockout at 3.5V (min). The auxiliary boost regulator operates fully independently-functional even when main controllers are shut down-and provides regulation up to 34V with 1.26V ±0.03V AUXVFB reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.5V to 36V - supports wide-input industrial and automotive battery rails without pre-regulation |
| Step-Down Feedback Voltage | 0.800V ±0.8% - enables precise output setting with high-resistor-divider tolerance margin |
| Step-Up Switch Rating | 1A, 36V, 400mV VCE(SAT) @ 1A - allows high-efficiency 12V/200mA boost with minimal conduction loss |
| Switching Frequency | 150–300kHz (step-down), 1.2MHz (boost) - balances EMI, size, and efficiency across outputs |
| Operating Temp Range | –40°C to +85°C - qualified for extended-temperature industrial and embedded applications |
| Quiescent Current | 350µA (normal), 125µA (standby), 20–35µA (shutdown) - enables low-power sleep modes in portable systems |
| PGOOD Accuracy | ±7.5% window on VOSENSE - ensures reliable system power sequencing and fault detection |
Pinout & Package
Package: 36-lead plastic SSOP (G package), 0.025" pitch, JEDEC MS-013AC, body size 10.2mm × 5.3mm. Thermal resistance θJA = 95°C/W. RoHS-compliant, lead-free finish.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD (36) | Open-drain power-good indicator | Pulled low if either VOSENSE1 or VOSENSE2 deviates >±7.5% - used for system enable/disable sequencing |
| TG1 (35), TG2 (24) | Top-gate drivers for N-MOSFETs | Floating 5V swing referenced to SWx - drives high-side switches in synchronous buck stages |
| BG1 (31), BG2 (27) | Bottom-gate drivers for N-MOSFETs | 0–5V ground-referenced drive - controls synchronous rectification and OV recovery |
| VOSENSE1 (4), VOSENSE2 (12) | Remote feedback inputs | Differential sensing points - connect to resistor dividers for accurate output voltage regulation |
| RUN/SS1 (1), RUN/SS2 (23) | Soft-start and run control | Capacitor-programmed ramp; <1V forces shutdown; 1.5V threshold enables full current - enables independent sequencing |
| FCB (7) | Forced continuous/Burst Mode control | <0.8V forces PWM; 0.8–2.7V enables Burst Mode; tied to INTVCC disables Burst - selects low-load efficiency mode |
| AUXVFB (16) | Auxiliary boost feedback | 1.26V reference input - sets boost output voltage via external resistor divider (e.g., 12V @ R1/R2 = 8.5k/1.2k) |
| 3.3VOUT (10) | Integrated linear regulator output | Stable 3.3V ±1.5%, 10mA DC / 50mA peak - powers MCU cores, logic, or monitoring circuitry without external LDO |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual buck controllers | Reduces RMS input ripple current by ~30% vs. in-phase design - cuts required bulk input capacitance by half |
| OPTI-LOOP™ compensation | Allows stable loop response across 10µF–1000µF output capacitors with varying ESR - eliminates need for custom compensation per design |
| 99% max duty cycle operation | Enables <100mV dropout at 5V output with 5.1V input - supports ultra-low-voltage battery operation in PDAs |
| Independent auxiliary boost regulator | 1.2MHz fixed-frequency, 34V max output, 1A switch - generates isolated bias rails without loading main converters |
| Three-state STBYMD pin | Single-pin control for global shutdown, autonomous startup, or always-on 3.3V/5V standby - simplifies system power management |
| Programmable frequency (150–300kHz) | FREQSET pin accepts 0–2.4V to adjust oscillator - enables EMI band steering and layout-optimized frequency selection |
Applications
| Notebook Power Supply | Industrial Embedded System |
|---|---|
|
Use Scenario: Dual-core CPU + DDR3 memory + display backlight in 15W-class ultraportable laptop. IC Role / Device Role / Timing Role: Primary triple-rail power controller delivering 5V@4A (CPU core), 3.3V@5A (memory/I/O), and 12V@200mA (backlight LED driver). Use Value: Out-of-phase buck stages reduce input capacitor count from 4× to 2× 47µF ceramics; 3.3VOUT powers EC firmware independently during suspend. |
Use Scenario: Programmable logic controller (PLC) with 24V field bus, isolated I/O, and ARM Cortex-M7 host. IC Role / Device Role / Timing Role: Central power manager generating 5V@3A (processor), 3.3V@2A (FPGA config), and 12V@150mA (isolated RS-485 transceiver bias). Use Value: 36V max VIN withstands 24V bus transients; STBYMD pin enables wake-on-LAN via always-on 3.3V rail; PGOOD coordinates FPGA configuration sequence. |
| Battery-Powered Test Equipment | Medical Point-of-Care Monitor |
|
Use Scenario: Handheld oscilloscope with Li-ion battery (3.0–4.2V), analog front-end, and color TFT display. IC Role / Device Role / Timing Role: Step-up regulator generates 12V for display bias; dual buck stages supply 3.3V@3A (ADC/FPGA) and 5V@2A (USB host). Use Value: Burst Mode™ extends battery life >3× vs. forced PWM at light load; 1.2MHz boost allows 2.2µH inductor - saves board space vs. discrete boost IC. |
Use Scenario: Portable ECG monitor requiring low-noise analog rails, isolated USB charging, and clinical-grade reliability. IC Role / Device Role / Timing Role: Generates 3.3V@100mA (low-noise analog sensor bias), 5V@500mA (digital logic), and 12V@100mA (opto-isolator LED driver). Use Value: OPTI-LOOP™ ensures stable regulation with polymer capacitors (low ESR); ±7.5% PGOOD window meets IEC 60601-1 power sequencing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3728CUHF#PBF | Dual-phase synchronous buck only (no integrated boost or 3.3V LDO); requires external boost IC and LDO; 40V max VIN | Suitable where boost rail is generated separately; lacks auxiliary regulator independence and integrated standby power | Select when higher step-down current (>10A) is needed and auxiliary functions are handled externally |
| MP2918GL-Z | Single-chip triple-output buck (no boost); 5V/3.3V/1.8V fixed outputs; no FCB/Burst Mode; 28V max VIN | Targeted at SoC power delivery only; no high-voltage boost capability or programmable frequency | Choose for cost-sensitive consumer applications needing only low-voltage rails and no 12V/boost generation |
Compared with LTC3728CUHF#PBF and MP2918GL-Z, the LTC1876EG#TRPBF uniquely integrates a self-contained 1.2MHz boost stage and 3.3V LDO, enabling complete triple-rail power solutions in a single IC - eliminating four external components while supporting both high-efficiency light-load operation and industrial-grade input voltage range.
Availability
LTC1876EG#TRPBF is available at Aetrix Electronics and suitable for notebook computers, industrial PLCs, battery-powered test equipment, and medical point-of-care monitors requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.
Supply support for LTC1876EG#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 semiconductors, acquired Linear Technology in 2017 to expand its power management portfolio.
The LTC1876EG#TRPBF belongs to ADI's legacy Linear Technology switching controller family, designed specifically for compact, high-efficiency multi-rail power supplies in portable computing and industrial embedded systems where integration, thermal performance, and reliability are critical.
FAQ
What is the maximum output current capability of the LTC1876EG#TRPBF's integrated 3.3V linear regulator?
The LTC1876EG#TRPBF's 3.3VOUT pin delivers up to 10mA DC current with peak capability of 50mA. This is sufficient to power microcontroller reset supervisors, EEPROMs, or low-power logic, but not intended for high-current loads. For higher current, external regulation is required. The LTC1876EG#TRPBF datasheet specifies 3.25V to 3.45V output voltage accuracy under no-load conditions.
Can the LTC1876EG#TRPBF operate with input voltages below 3.5V?
No - the LTC1876EG#TRPBF has a guaranteed minimum operating VIN of 3.5V due to its internal undervoltage lockout (UVLO) threshold of 3.5V (typical). Operation below this voltage is not characterized or supported. Attempting to power the LTC1876EG#TRPBF from a deeply discharged Li-ion cell (<3.4V) will prevent startup and may cause erratic behavior. Always ensure VIN remains ≥3.5V across the full operating temperature range.
How does the FCB pin affect the LTC1876EG#TRPBF's efficiency at light load?
The FCB pin directly controls light-load efficiency mode: below 0.8V it forces continuous PWM (lower efficiency), between 0.8V and (INTVCC – 2V) it enables Burst Mode™ (high efficiency), and at INTVCC it enforces constant-frequency discontinuous conduction. In Burst Mode™, the LTC1876EG#TRPBF achieves >80% efficiency at 10mA load (vs. ~40% in forced PWM), making it ideal for battery-powered standby states. The LTC1876EG#TRPBF's typical efficiency curves confirm this 2–3× improvement.
Is the LTC1876EG#TRPBF pin-compatible with other members of the LTC187x family?
No - the LTC1876EG#TRPBF is not pin-compatible with LTC1871 or LTC1872. While sharing functional similarities, the LTC1876EG#TRPBF uses a unique 36-pin SSOP package with dedicated pins for dual RUN/SS, separate AUXSW/AUXPGND, and integrated 3.3VOUT. Pinouts differ significantly: e.g., LTC1871 uses 28-pin TSSOP and lacks auxiliary boost control pins. PCB layout must be designed specifically for the LTC1876EG#TRPBF footprint.
What thermal derating applies to the LTC1876EG#TRPBF in a 2-layer PCB design?
With θJA = 95°C/W specified for the 36-lead SSOP package, the LTC1876EG#TRPBF's junction temperature rises ~95°C above ambient per watt dissipated. On a standard 2-layer board with minimal copper pour, power dissipation should be limited to ≤0.8W to keep TJ ≤125°C at 85°C ambient. Adding 2oz copper on inner layers and thermal vias under PGND/AUXPGND can reduce θJA to ~65°C/W, allowing ~1.2W. Always verify with actual board layout thermal simulation.
LTC1876EG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 36-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 3
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 3.5V ~ 36V
- Frequency - Switching:
- 220kHz
- Duty Cycle (Max):
- 99.4%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-SSOP
LTC1876EG#TRPBF FAQ
1.How can I place an order for LTC1876EG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1876EG#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 LTC1876EG#TRPBF reliable?
The price and inventory of LTC1876EG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1876EG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1876EG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1876EG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1876EG#TRPBF?
LTC1876EG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1876EG#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 LTC1876EG#TRPBF?
For technical support, including LTC1876EG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1876EG#TRPBF requirements.
6.How does Aetrix verify that LTC1876EG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1876EG#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 LTC1876EG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1876EG#TRPBF?
All LTC1876EG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1876EG#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 LTC1876EG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1876EG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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