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Analog Devices Inc. LTC3828EG#PBF
- Part No.:
- LTC3828EG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3828EG#PBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,012
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Product details
Overview
LTC3828EG#PBF from Analog Devices (formerly Linear Technology) is a dual, 2-phase synchronous step-down controller driving two independent N-channel MOSFET stages for high-efficiency DC/DC conversion. It delivers ±1% output voltage accuracy, phase-lockable 260–550 kHz switching, and precision tracking between outputs - enabling tightly regulated 2.5V/3.3V or 3.3V/5V supplies in telecom infrastructure and ASIC power systems.
For engineers reviewing the LTC3828EG#PBF datasheet, LTC3828EG#PBF pinout, LTC3828EG#PBF application, or LTC3828EG#PBF equivalent, key selection criteria include dual-phase interleaving for reduced input ripple, OPTI-LOOP® compensation for wide capacitor/ESR tolerance, TRCKSS-based soft-start and ratiometric tracking, and FCB/PLLIN-selectable light-load modes (Burst, skip-cycle, forced continuous).
Technical Context
The LTC3828EG#PBF implements constant-frequency current-mode control with two 180° out-of-phase channels, each featuring independent RUN pins, ITH error amplifier outputs, and differential SENSE+/- current sensing. Its PLL architecture accepts external synchronization via FCB/PLLIN and supports daisy-chaining through CLKOUT for multi-phase expansion beyond two phases.
It integrates a 5V internal LDO (INTVCC), output overvoltage protection (±7.5% trip), foldback current limiting activated below 70% nominal VOUT, and dropout detection enabling 99% duty cycle operation. The TRCKSS pins provide programmable soft-start ramping (1.2 μA internal charge current) and master/slave voltage tracking without external op-amps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V (30V absolute max); supports 12V/24V industrial rails and all common battery chemistries. |
| Output Voltage Accuracy | ±1% over line, load, and temperature; enables precise regulation of core logic and I/O supplies. |
| Switching Frequency Range | 260 kHz to 550 kHz (phase-lockable); allows EMI optimization and inductor size reduction. |
| Phase Configuration | Fixed 180° interleaving; cuts RMS input current by ~30% vs. single-phase, reducing input cap size and losses. |
| Tracking Capability | TRCKSS1/TRCKSS2 pins support ratiometric or coincident soft-start and output voltage tracking between channels. |
| Light-Load Modes | Selectable via FCB/PLLIN: Burst Mode® (high efficiency at light loads), skip-cycle, or forced continuous PWM. |
| Protection Features | Output overvoltage lockout (±7.5%), current foldback during short-circuit, reverse-current blocking during soft-start. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 11.5 mm × 5.0 mm × 1.75 mm body, exposed pad not present. Thermal resistance θJA = 95°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| TG1/TG2 | Top gate drive outputs | Drive N-channel high-side MOSFET gates with floating 5V swing referenced to SW nodes. |
| BG1/BG2 | Bottom gate drive outputs | Drive N-channel low-side MOSFET gates with 0–5V swing referenced to PGND. |
| SENSE1+/–, SENSE2+/– | Differential current sense inputs | Measure inductor current via external RSENSE; enable cycle-by-cycle peak current limiting. |
| VOSENSE1/VOSENSE2 | Feedback voltage inputs | Accept remote-sensed output voltage via resistor divider; referenced to 0.8V internal reference. |
| TRCKSS1/TRCKSS2 | Soft-start & tracking control | Internal 1.2 μA current source charges external capacitor; enables master-slave voltage ramp coordination. |
| FCB/PLLIN | Mode select & sync input | Configures light-load mode (Burst/skip/continuous) and accepts external clock for PLL synchronization. |
| RUN1/RUN2 | Independent channel enable | Logic-controlled shutdown: <1.0V disables, >2.0V enables; allows staggered startup or dynamic channel disable. |
| CLKOUT | Phase-locked clock output | 90° out-of-phase with Channel 1 in SSOP; used to synchronize additional controllers for 3-/4-/6-phase designs. |
| PGOOD | Open-drain power-good indicator | Asserts low when either VOSENSE deviates >±7.5% from setpoint; supports system sequencing and fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 180° interleaved control | Reduces input capacitor RMS current by up to 30%, lowering required capacitance and EMI filtering cost. |
| OPTI-LOOP® compensation | Enables stable loop response across wide range of ceramic output capacitors (10 μF–1000 μF) and ESR values. |
| Programmable tracking & soft-start | TRCKSS pins eliminate need for external tracking ICs; support ratiometric (e.g., 3.3V/2.5V) or coincident ramp profiles. |
| 99% maximum duty cycle | Supports ultra-low dropout operation (e.g., 5V→4.95V), critical for battery-powered systems near end-of-discharge. |
| Three selectable light-load modes | Optimizes efficiency across full load range: Burst Mode® (<100 mA), skip-cycle, or forced continuous PWM (no current reversal). |
| Integrated 5V LDO (INTVCC) | Self-powered gate drivers and control circuitry; eliminates need for external bias supply, simplifying BOM. |
Applications
| Telecom Point-of-Load Supply | ASIC/FPGA Core & I/O Power |
|---|---|
Use Scenario: Dual-rail power delivery for baseband processors in 4G/5G small cells requiring tight transient response and low noise. IC Role / Device Role / Timing Role: Dual-phase controller generating synchronized 1.2V core and 3.3V I/O rails with ratiometric tracking during power-up. Use Value: Interleaved operation reduces input ripple amplitude by 50%, easing compliance with EN55022 Class B conducted EMI limits. |
Use Scenario: High-current, low-voltage power for multi-core SoCs where rail sequencing and voltage margining are critical. IC Role / Device Role / Timing Role: Precision 0.8V reference and ±1% accuracy ensure reliable core voltage under dynamic load steps up to 5 A/μs. Use Value: Independent RUN1/RUN2 pins allow controlled sequencing - e.g., enable 3.3V I/O before 1.2V core - preventing latch-up. |
| Industrial PLC Backplane Power | Automotive ADAS Domain Controller |
Use Scenario: Robust 24V-to-5V/3.3V conversion in programmable logic controllers operating in harsh 0–70°C ambient environments. IC Role / Device Role / Timing Role: Dual-channel controller with integrated overvoltage protection (±7.5%) and thermal shutdown safeguarding downstream logic. Use Value: Wide 4.5–28V input range accommodates 24V rail transients (e.g., load dump), eliminating need for upstream pre-regulator. |
Use Scenario: Power management for vision-processing units in autonomous driving ECUs requiring ASIL-B compatible sequencing and monitoring. IC Role / Device Role / Timing Role: PGOOD output signals valid rail status to safety microcontroller; TRCKSS ensures safe boot sequence across multiple voltage domains. Use Value: Foldback current limiting during short-circuit prevents thermal runaway in confined chassis, supporting ISO 26262 functional safety goals. |
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 |
|---|---|---|---|
| LTC3855EUFD#PBF | Single-channel, 4-phase capable; lacks dual independent RUN pins and TRCKSS tracking; higher max fSW (800 kHz). | Suitable for single-output, high-current rails (e.g., GPU core); not for dual-rail tracking or independent channel control. | Choose LTC3855 if needing >550 kHz switching or 4-phase interleaving on one output; avoid for dual-rail tracking. |
| MP8770GQ-Z | Monolithic dual buck (integrated MOSFETs); fixed 500 kHz fSW; no PLL sync, no TRCKSS, no OPTI-LOOP. | Targeted at space-constrained consumer applications; lacks precision tracking, wide VIN, or robust protection features. | Choose MP8770 for cost-sensitive, low-power embedded systems where board area > performance; not for telecom/industrial. |
Compared with LTC3855EUFD#PBF and MP8770GQ-Z, the LTC3828EG#PBF uniquely combines dual independent control loops, hardware-based voltage tracking, and phase synchronization - making it optimal for applications demanding coordinated multi-rail power with strict sequencing and EMI constraints.
Availability
LTC3828EG#PBF is available at Aetrix Electronics and suitable for telecom infrastructure, ASIC power supply, and industrial equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3828EG#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 analog and power management portfolio with rigorous automotive, industrial, and aerospace qualification standards.
The LTC3828EG#PBF belongs to Linear's high-efficiency dual-phase controller product line, designed specifically for applications requiring tightly regulated, tracked dual-output DC/DC conversion with minimal input filtering and superior transient response.
FAQ
What is the maximum supported switching frequency for LTC3828EG#PBF?
The LTC3828EG#PBF supports a phase-lockable switching frequency range of 260 kHz to 550 kHz. At VPLLFLTR ≥ 2.4 V, the nominal frequency reaches 550 kHz (typical), enabling compact magnetics and improved transient response. Frequencies above 550 kHz are not specified or guaranteed for the LTC3828EG#PBF.
Does LTC3828EG#PBF support output voltage tracking between channels?
Yes, the LTC3828EG#PBF supports hardware-based output voltage tracking using the TRCKSS1 and TRCKSS2 pins. When configured in master/slave mode, the slave channel replicates the master's VOSENSE voltage via an external resistor divider applied to its TRCKSS pin, enabling precise ratiometric or coincident soft-start and regulation.
What protection features are integrated into LTC3828EG#PBF?
The LTC3828EG#PBF integrates output overvoltage protection (±7.5% trip threshold), current foldback limiting (activated below 70% nominal VOUT), reverse-current blocking during soft-start, and dropout detection enabling 99% duty cycle. These features protect downstream loads and power stages without requiring external components.
Can LTC3828EG#PBF operate with only one channel enabled?
Yes, LTC3828EG#PBF supports independent channel control via RUN1 and RUN2 pins. Driving RUN1 low disables Channel 1 while leaving Channel 2 fully operational - useful for dynamic power scaling or fault isolation. PGOOD monitors only enabled channels, ignoring disabled ones.
What is the purpose of the FCB/PLLIN pin on LTC3828EG#PBF?
The FCB/PLLIN pin on LTC3828EG#PBF serves two functions: (1) selecting light-load operation mode (Burst Mode®, skip-cycle, or forced continuous PWM) via voltage level, and (2) accepting an external clock signal for phase synchronization. When synchronized, Channel 1 locks to the external clock edge, and Channel 2 follows with fixed phase offset.
LTC3828EG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- 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):
- 4.5V ~ 28V
- Frequency - Switching:
- 260kHz ~ 550kHz
- Duty Cycle (Max):
- 99.4%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Phase Control, Power Good, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3828EG#PBF FAQ
1.How can I place an order for LTC3828EG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3828EG#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 LTC3828EG#PBF reliable?
The price and inventory of LTC3828EG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3828EG#PBF is usually 5 days.
3.What payment methods are accepted for LTC3828EG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3828EG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3828EG#PBF?
LTC3828EG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3828EG#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 LTC3828EG#PBF?
For technical support, including LTC3828EG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3828EG#PBF requirements.
6.How does Aetrix verify that LTC3828EG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3828EG#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 LTC3828EG#PBF meets industry standards.
7.What is the process for return or replacement of LTC3828EG#PBF?
All LTC3828EG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3828EG#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 LTC3828EG#PBF part is unused and in its original packaging.
Return procedure for LTC3828EG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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