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Analog Devices Inc. LTC1876EG#PBF
- Part No.:
- LTC1876EG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 36-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1876EG#PBF.pdf
- Description:
- IC REG CTRLR BUCK 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,874
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Product details
Overview
LTC1876EG#PBF from Analog Devices (formerly Linear Technology) is a triple-output synchronous switching regulator controller integrating two out-of-phase 150–300 kHz step-down controllers and one 1.2 MHz step-up regulator with internal 1 A, 36 V switch. It delivers regulated 5 V/3.3 V/12 V outputs for notebook power systems, supports 3.5–36 V main input and 2.6–16 V auxiliary input, and features OPTI-LOOP™ compensation and latched short-circuit shutdown.
For engineers reviewing the LTC1876EG#PBF datasheet, LTC1876EG#PBF pinout, LTC1876EG#PBF application, or LTC1876EG#PBF equivalent, key selection considerations include dual-phase interleaved operation to reduce input ripple, independent RUN/SS soft-start and fault management per channel, forced continuous/Burst Mode™ selection via FCB pin, and integrated 3.3 V linear standby regulator delivering up to 10 mA.
Technical Context
The LTC1876EG#PBF implements current-mode control for both step-down channels using out-of-phase clocking to minimize input capacitor RMS current and supply-induced noise. Each channel employs transconductance error amplifiers (gm = 1.3 mmho, GBW = 3 MHz) with VOSENSE feedback referenced to 0.800 V ±0.8%, and ITH-controlled peak current limiting with adjustable soft-start via external capacitor on RUN/SS pins.
The auxiliary boost regulator operates independently at fixed 1.2 MHz with current-mode control, 1.26 V ±0.03 V feedback threshold (AUXVFB), and internal 1 A switch featuring 330–550 mV saturation voltage at 900 mA. Its shutdown is controlled separately via AUXSD, and regulation is maintained down to 2.4 V AUXVIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Step-down Output Voltage Accuracy | 0.800 V ±0.8% at VOSENSE pins - sets precise 5 V/3.3 V output via external resistor dividers |
| Step-down Switching Frequency Range | 150–300 kHz (adjustable via FREQSET) - enables optimization of efficiency vs. size for 5 V/3.3 V rails |
| Auxiliary Boost Frequency | Fixed 1.2 MHz - allows use of miniature inductors and ceramic capacitors for 12 V output |
| Main Input Voltage Range | 3.5 V to 36 V - supports wide-range battery and adapter inputs in portable computing |
| Auxiliary Input Voltage Range | 2.6 V to 16 V - enables direct connection to Li-ion cells or secondary windings |
| Integrated 3.3 V LDO Output | 3.35 V ±0.05 V, 10 mA max - powers microcontrollers or logic without external regulators |
| Operating Temperature Range | –40°C to +85°C - qualified for industrial and extended-temperature embedded applications |
Pinout & Package
Package: 36-lead plastic SSOP (G package), 0.025" pitch, JEDEC MO-153 compliant, thermal resistance θJA = 95°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 (Pins 1, 23) | Soft-start / Run enable / Short-circuit timer | Capacitor-based ramp controls startup current slew rate; <1 V forces shutdown; latch-off triggered by overcurrent |
| VOSENSE1, VOSENSE2 (Pins 4, 12) | Main output voltage feedback inputs | Differential remote sense inputs referenced to 0.800 V - enable accurate regulation despite PCB trace IR drop |
| TG1, TG2 (Pins 35, 24); BG1, BG2 (Pins 31, 27) | Top/bottom N-MOSFET gate drivers | Floating high-side (TG) and ground-referenced low-side (BG) drivers - support synchronous rectification with >3 A peak drive capability |
| AUXVFB (Pin 16); AUXSD (Pin 22) | Auxiliary boost feedback and shutdown | 1.26 V reference input for 12 V output setting; active-low shutdown with 0.5 V threshold - enables independent boost control |
| PGOOD (Pin 36) | Power-good open-drain output | Asserts low when either VOSENSE deviates >±7.5% - provides system-level power sequencing and fault indication |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual step-down controllers | Reduces input capacitor RMS current by ~30% and suppresses conducted EMI in multi-rail systems |
| OPTI-LOOP™ compensation | Enables stable loop response across wide range of output capacitance (4.7 µF to 1000 µF) and ESR (1 mΩ to 100 mΩ) |
| Independent RUN/SS with latched shutdown | Per-channel soft-start timing and configurable short-circuit protection - prevents cascading faults in multi-output designs |
| FCB pin mode selection | Selects between Burst Mode™ (high efficiency at light load), forced continuous (low-noise), or auxiliary winding regulation |
| Integrated 3.3 V/10 mA LDO | Eliminates need for external bias rail - powers supervisory circuits or microcontroller I/O during standby |
Applications
| Notebook Power System | Industrial Embedded Controller |
|---|---|
|
Use Scenario: Dual-core CPU platform requiring tightly regulated 5 V core, 3.3 V I/O, and 12 V display backlight from single Li-ion or AC adapter input. IC Role / Device Role / Timing Role: Triple-output controller managing interleaved buck conversion for main rails and boost conversion for auxiliary rail with synchronized PGOOD assertion. Use Value: Reduces total solution footprint by 35% versus discrete controllers; achieves >90% efficiency at 2 A load on 5 V rail with 150 kHz operation. |
Use Scenario: Programmable logic controller (PLC) with isolated field I/O needing clean 3.3 V logic supply, 5 V analog front-end, and 12 V sensor excitation - all derived from 24 V DC bus. IC Role / Device Role / Timing Role: Primary power management IC providing three independent, remotely sensed regulated outputs with overvoltage lockout and thermal derating. Use Value: Maintains ±0.5% output regulation under 100% load step at –40°C to +85°C; eliminates need for external OV protection circuitry. |
| Portable Medical Monitor | Battery-Powered Test Equipment |
|
Use Scenario: Handheld ECG device powered by two-series Li-ion cells (6–8.4 V), requiring ultra-low-noise 3.3 V ADC reference, 5 V display driver, and 12 V op-amp bias. IC Role / Device Role / Timing Role: Low-quiescent-current triple regulator with Burst Mode™ operation and 125 µA standby current - extends battery life while maintaining rail integrity. Use Value: Achieves 87% efficiency at 10 mA load on 3.3 V rail; PGOOD ensures safe boot sequence before FPGA configuration. |
Use Scenario: Portable oscilloscope with mixed-signal acquisition requiring isolated analog supplies (±5 V, +12 V) and digital core (3.3 V) from single 12 V sealed lead-acid battery. IC Role / Device Role / Timing Role: High-voltage capable controller supporting 36 V max VIN and 34 V boost output - enables direct battery-to-12 V conversion without pre-regulator. Use Value: Delivers 200 mA at 12 V from 12 V input with <100 mV dropout - eliminates need for inefficient linear post-regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output switching controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3728CUHF#PBF | Single 2-phase controller (no integrated boost); 3–36 V input; 0.6 V reference; no 3.3 V LDO | Requires external boost stage for third rail; better suited for high-current dual-rail only systems | Choose when only dual 5 V/3.3 V rails needed and board space allows discrete boost solution |
| MP2918GL-Z | Dual buck controller + integrated 1.2 MHz boost (1.5 A switch); 2.7–24 V main input; no 3.3 V LDO | Lower VIN range limits use with 28 V industrial supplies; lacks dedicated standby regulator | Prefer for cost-sensitive consumer applications where 3.3 V LDO is implemented externally |
Compared with LTC3728CUHF#PBF and MP2918GL-Z, the LTC1876EG#PBF uniquely integrates a 3.3 V/10 mA LDO, supports 36 V main input, and provides per-channel RUN/SS with latched fault protection - making it optimal for ruggedized portable and industrial triple-rail systems requiring minimal BOM count.
Availability
LTC1876EG#PBF is available at Aetrix Electronics and suitable for notebook power systems, industrial PLCs, portable medical monitors, and battery-powered test equipment requiring stable component supply with long-term lifecycle assurance.
Supply support for LTC1876EG#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 and maintains full product support, datasheet documentation, and application engineering for legacy Linear parts including the LTC1876EG#PBF.
The LTC1876EG#PBF belongs to Linear's high-performance power management controller family, designed specifically for compact, efficient multi-rail power solutions in portable computing and industrial embedded systems where integration, reliability, and thermal robustness are critical.
FAQ
What is the maximum input voltage rating for the LTC1876EG#PBF main supply pin (VIN)?
The absolute maximum rating for the VIN pin of the LTC1876EG#PBF is 36 V, with recommended operating range from 3.5 V to 30 V. Operation above 30 V is permissible only for brief transients, and sustained operation beyond 36 V will damage the device. The internal UVLO threshold is 3.5 V (typical), ensuring reliable startup from Li-ion or 5 V adapter sources.
How does the FCB pin affect operating mode selection in the LTC1876EG#PBF?
The FCB pin on the LTC1876EG#PBF selects among three modes: below 0.8 V forces continuous PWM (low-noise, lower efficiency), between 0.8 V and (INTVCC – 2 V) enables Burst Mode™ (high efficiency at light loads), and ≥4.3 V disables Burst Mode™ for constant-frequency operation. This pin also regulates auxiliary windings by forcing synchronous operation during transient events.
Can the LTC1876EG#PBF operate with only the auxiliary boost regulator enabled while the step-down controllers are shut down?
Yes - the auxiliary boost regulator in the LTC1876EG#PBF is fully independent. When both RUN/SS pins are pulled low to disable the step-down controllers, the boost section remains functional if AUXSD is held ≥2.4 V and AUXVIN is within 2.6–16 V. This enables "always-on" 12 V bias generation for wake-up circuitry or real-time clocks without powering main rails.
What is the purpose of the STBYMD pin on the LTC1876EG#PBF and how should it be configured?
The STBYMD pin on the LTC1876EG#PBF is a three-state control that manages shared internal circuitry: grounded to force global shutdown, open to enable normal RUN/SS operation, or pulled >2 V to activate both internal 5 V and 3.3 V LDOs regardless of controller state. For most designs, connect a 0.01 µF capacitor to ground unless using the keep-alive function for system wake-up.
Does the LTC1876EG#PBF provide overvoltage protection, and how does it respond to an overvoltage condition?
Yes - the LTC1876EG#PBF includes dedicated overvoltage comparators monitoring VOSENSE1 and VOSENSE2. If either output exceeds its nominal value by >7.5%, the top MOSFET is turned off and the bottom MOSFET is latched on until the output returns within regulation. This protects downstream components without requiring external crowbar circuitry.
LTC1876EG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 36-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC1876EG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1876EG#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 LTC1876EG#PBF reliable?
The price and inventory of LTC1876EG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1876EG#PBF is usually 5 days.
3.What payment methods are accepted for LTC1876EG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1876EG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1876EG#PBF?
LTC1876EG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1876EG#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 LTC1876EG#PBF?
For technical support, including LTC1876EG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1876EG#PBF requirements.
6.How does Aetrix verify that LTC1876EG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1876EG#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 LTC1876EG#PBF meets industry standards.
7.What is the process for return or replacement of LTC1876EG#PBF?
All LTC1876EG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1876EG#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 LTC1876EG#PBF part is unused and in its original packaging.
Return procedure for LTC1876EG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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