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Analog Devices Inc. LTC3827IG-1#PBF
- Part No.:
- LTC3827IG-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3827IG-1#PBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,082
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Product details
Overview
LTC3827IG-1#PBF from Analog Devices (formerly Linear Technology) is a dual, 2-phase synchronous step-down controller driving all-N-channel MOSFET stages. It delivers precise 0.8V reference accuracy (±1%), operates from 4V to 36V input, supports 140kHz–650kHz phase-lockable switching, and achieves 80μA no-load quiescent current-enabling high-efficiency power conversion in battery-powered digital systems.
For engineers reviewing the LTC3827IG-1#PBF datasheet, LTC3827IG-1#PBF pinout, LTC3827IG-1#PBF application, or LTC3827IG-1#PBF equivalent, key selection criteria include out-of-phase dual-channel operation for reduced input capacitance, OPTI-LOOP® compensation for wide output capacitor/ESR tolerance, selectable light-load modes (Burst Mode®, pulse-skipping, continuous), and independent TRACK/SS pins for soft-start or voltage tracking.
Technical Context
The LTC3827IG-1#PBF implements a constant-frequency current-mode architecture with two independent controllers operating 180° out of phase. Each channel features a transconductance error amplifier (gm = 1.55 mmho), precision 0.8V feedback reference (±1% over temperature), and dedicated ITH pins for peak-current control via external sense resistors.
Its PLLIN/MODE pin enables dynamic mode selection: Burst Mode® (≤0.7V), pulse-skipping (0.9V < V < INTVCC–1.2V), or forced continuous conduction (tied to INTVCC). The PLL circuit supports synchronization to external clocks from 140kHz to 650kHz, while OPTI-LOOP® allows stable loop compensation across diverse ceramic and polymer output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports 12V/24V industrial rails and all common battery chemistries (Li-ion, lead-acid, NiMH). |
| Output Voltage Accuracy | ±1% - ensures tight regulation for sensitive digital loads like FPGAs and microprocessors without external calibration. |
| No-Load Quiescent Current | 80μA (one channel active) - extends runtime in always-on battery systems such as portable instrumentation. |
| Switching Frequency Range | 140kHz to 650kHz - adjustable via PLLLPF pin or external clock; higher frequencies enable smaller magnetics and input caps. |
| Reference Voltage | 0.800V ±0.008V - low-drift internal bandgap reference enabling accurate scaling to 0.8V–10V outputs via resistor dividers. |
| Power Good Output | Open-drain PGOOD1 - asserts low when VFB1 deviates >±10% from setpoint, enabling safe sequencing in multi-rail systems. |
| Shutdown Current | 8μA - achieved when both RUN1 and RUN2 are pulled below 0.7V, minimizing standby drain in host-controlled power management. |
Pinout & Package
Package: 28-Lead Plastic SSOP (G package), –40°C to +85°C operating temperature range, lead-free finish (PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1, ITH2 (1, 13) | Error amplifier output / current limit control | Directly sets peak inductor current per channel; voltage ramp controls transient response and foldback behavior. |
| VFB1, VFB2 (2, 12) | Feedback input | Compares divided output voltage against 0.8V reference; enables remote sensing for load regulation accuracy. |
| SENSE1+, SENSE2+ (3, 11) SENSE1–, SENSE2– (4, 10) | Differential current sense inputs | Measure voltage drop across external RSENSE; support bidirectional sensing and reverse-current detection. |
| PLLIN/MODE (6) | Mode select / external sync input | Selects light-load operation (Burst/Pulse-Skip/Continuous) or accepts external clock for phase alignment of dual channels. |
| RUN1, RUN2 (8, 9) | Digital enable/disable control | Independent channel shutdown; pulling both low disables entire IC and reduces IQ to 8μA. |
| TG1, TG2 (26, 15) BG1, BG2 (23, 18) | Top/bottom gate drivers | Drive N-MOSFET gates with 50ns rise/fall times; TG swings at SW node + INTVCC–0.5V; BG swings 0V to INTVCC. |
| TRACK/SS1, TRACK/SS2 (28, 14) | Soft-start / tracking input | Internal 1μA pull-up charges external cap for linear VOUT ramp; also accepts external divider for supply tracking during startup. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces RMS input ripple current by ~70%, allowing smaller input bulk capacitors and lower EMI noise coupling into system supplies. |
| OPTI-LOOP® compensation | Enables stable loop response with ceramic, polymer, or mixed-output capacitor banks without manual compensation redesign. |
| Independent TRACK/SS pins | Supports programmable soft-start timing per channel or precise voltage tracking between multiple regulators during power-up sequencing. |
| Current foldback limiting | Reduces MOSFET thermal stress during short-circuit events by lowering peak current as VOUT collapses, preventing thermal runaway. |
| 99% duty cycle capability | Enables ultra-low dropout operation near VIN = VOUT, critical for post-regulation in high-efficiency intermediate bus architectures. |
Applications
| Automotive Infotainment Power | Industrial FPGA Core Supply |
|---|---|
Use Scenario: Dual-rail power for head-unit SoC requiring 3.3V I/O and 1.2V core with strict sequencing and low-noise operation. IC Role / Device Role / Timing Role: Dual-phase controller managing independent 3.3V and 1.2V outputs with synchronized soft-start and PGOOD monitoring. Use Value: Out-of-phase operation minimizes conducted EMI on shared 12V battery rail; ±1% accuracy ensures reliable SoC boot and operation. | Use Scenario: High-current, low-voltage core supply for Xilinx Artix-7 FPGA in programmable logic controller (PLC) with thermal constraints. IC Role / Device Role / Timing Role: Synchronous buck controller delivering up to 15A total (split across phases) with current-mode stability under dynamic load steps. Use Value: 80μA quiescent current extends uptime in battery-backed PLCs; OPTI-LOOP® maintains stability with low-ESR ceramic output caps. |
| Portable Medical Imaging Sensor | Distributed Telecom DC-DC System |
Use Scenario: Battery-powered ultrasound front-end requiring clean, sequenced 5V analog and 1.8V digital rails with minimal standby drain. IC Role / Device Role / Timing Role: Dual controller providing independent soft-start and shutdown control for analog/digital domains using TRACK/SS and RUN pins. Use Value: 8μA shutdown current preserves battery life during idle; Burst Mode® enables >85% efficiency at 10mA loads typical of sensor sleep states. | Use Scenario: Intermediate bus converter in 48V telecom shelf powering multiple point-of-load regulators with strict EMI limits. IC Role / Device Role / Timing Role: Primary 48V-to-12V step-down controller operating at 360kHz with external clock synchronization to avoid beat frequencies. Use Value: PLL synchronization eliminates variable switching noise; 36V max input accommodates 48V transients per GR-1089-CORE. |
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 |
|---|---|---|---|
| LTC3827EG-1#PBF | Same electrical specs and pinout; rated for 0°C to 85°C ambient instead of –40°C to 85°C. | Suitable for commercial-grade equipment where extended temperature range is not required. | Select LTC3827EG-1#PBF only if operating environment stays above 0°C; otherwise LTC3827IG-1#PBF ensures full spec compliance. |
| MP2918GL-Z | Single-chip dual-phase controller with integrated MOSFET drivers but no PLL sync or TRACK/SS pins; 4.5V–28V input; 500kHz fixed freq. | Lower BOM count for cost-sensitive designs; lacks out-of-phase noise reduction and flexible light-load modes. | Choose MP2918GL-Z for compact, low-cost solutions without need for external clock sync or precision sequencing. |
Compared with LTC3827EG-1#PBF, the LTC3827IG-1#PBF guarantees full performance over –40°C to 85°C, making it suitable for automotive and industrial deployments; versus MP2918GL-Z, it offers superior EMI control via phase offset, wider input range, and advanced light-load optimization-critical for battery longevity and noise-sensitive analog systems.
Availability
LTC3827IG-1#PBF is available at Aetrix Electronics and suitable for automotive infotainment power, industrial FPGA core supply, and portable medical imaging sensor applications requiring stable component supply across extended temperature ranges.
Supply support for LTC3827IG-1#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 its high-performance power management portfolio with rigorous reliability testing and automotive-grade qualification.
The LTC3827-1 product line delivers dual-phase synchronous buck control for high-efficiency, low-noise, and thermally robust power conversion in battery-powered and industrial systems demanding precision regulation and flexible sequencing.
FAQ
What is the guaranteed operating temperature range for the LTC3827IG-1#PBF?
The LTC3827IG-1#PBF is fully specified and guaranteed over –40°C to +85°C ambient temperature. This industrial-grade rating ensures consistent performance in automotive cabins, factory floors, and outdoor electronics where thermal extremes occur. Unlike the E-grade variant, the I-grade undergoes extended characterization and correlation with statistical process controls to validate specifications across this full range.
How does the LTC3827IG-1#PBF reduce input capacitor requirements compared to single-phase controllers?
The LTC3827IG-1#PBF reduces input RMS current by operating its two channels 180° out of phase, canceling fundamental ripple components. This allows up to 70% smaller input bulk capacitance while maintaining equivalent voltage ripple-critical for space-constrained designs like portable medical devices and telecom modules where board area and EMI are tightly controlled.
Can the LTC3827IG-1#PBF be synchronized to an external clock, and what is the supported frequency range?
Yes, the LTC3827IG-1#PBF supports external clock synchronization via the PLLIN/MODE pin. Its phase-locked loop guarantees lock to external clocks from 140kHz to 650kHz across all manufacturing variations, with typical capture up to 800kHz. This enables deterministic noise placement in dense PCB layouts and avoids beat frequencies in multi-converter systems.
What protection features does the LTC3827IG-1#PBF include for overload and fault conditions?
The LTC3827IG-1#PBF includes current foldback limiting to reduce MOSFET dissipation during short circuits, output overvoltage protection that disables top FETs if VFB exceeds ±12% of setpoint, and undervoltage lockout (UVLO) that disables operation below 3.5V input. These features prevent thermal damage and ensure safe recovery after faults without external circuitry.
Does the LTC3827IG-1#PBF support independent enable and soft-start control for each output channel?
Yes, the LTC3827IG-1#PBF provides independent RUN1/RUN2 pins for digital channel enable/disable and separate TRACK/SS1/TRACK/SS2 pins for per-channel soft-start ramping or voltage tracking. This enables precise power sequencing in multi-rail systems-such as FPGA-based edge AI accelerators-where core, I/O, and auxiliary supplies must ramp in defined order with controlled slew rates.
LTC3827IG-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-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:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 36V
- Frequency - Switching:
- 250kHz ~ 530kHz
- Duty Cycle (Max):
- 99.4%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3827IG-1#PBF FAQ
1.How can I place an order for LTC3827IG-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3827IG-1#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 LTC3827IG-1#PBF reliable?
The price and inventory of LTC3827IG-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3827IG-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3827IG-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3827IG-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3827IG-1#PBF?
LTC3827IG-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3827IG-1#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 LTC3827IG-1#PBF?
For technical support, including LTC3827IG-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3827IG-1#PBF requirements.
6.How does Aetrix verify that LTC3827IG-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3827IG-1#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 LTC3827IG-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3827IG-1#PBF?
All LTC3827IG-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3827IG-1#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 LTC3827IG-1#PBF part is unused and in its original packaging.
Return procedure for LTC3827IG-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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