My Inquiry
My Account
Analog Devices Inc. LTC3827EUH#PBF
- Part No.:
- LTC3827EUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3827EUH#PBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:126
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3827EUH#PBF from Analog Devices (formerly Linear Technology) is a dual, 2-phase synchronous step-down controller driving all-N-channel MOSFET stages for high-efficiency DC/DC conversion. It delivers precise 0.8V reference accuracy (±1%), operates from 4V to 36V input, supports 140kHz–650kHz phase-lockable switching, and achieves 99% duty cycle in dropout-enabling use in automotive battery systems and distributed power rails.
For engineers reviewing the LTC3827EUH#PBF datasheet, LTC3827EUH#PBF pinout, LTC3827EUH#PBF application, or LTC3827EUH#PBF equivalent, key selection criteria include its dual-channel out-of-phase operation reducing input capacitance, OPTI-LOOP® compensation for wide output capacitor/ESR tolerance, selectable light-load modes (Burst Mode®, pulse skipping, continuous), and integrated power-good monitoring with independent TRACK/SS control per channel.
Technical Context
The LTC3827EUH#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 ITH-controlled current limit with foldback protection.
Its PLLIN/MODE pin serves dual functions: external clock synchronization (115–800 kHz) and light-load mode selection (Burst Mode® below 0.7V, pulse skipping at 0.9V–INTVCC−1.2V, forced continuous at INTVCC). The internal INTVCC LDO supplies gate drivers from either VIN (5.25V) or EXTVCC (7.5V), enabling efficient self-biasing from output rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports 12V/24V automotive batteries and industrial DC inputs without pre-regulation. |
| Output Voltage Accuracy | ±1% - ensures stable regulation across load, line, and temperature for precision analog or digital supply rails. |
| No-Load Quiescent Current | 80μA (one channel active) - extends runtime in battery-powered systems such as portable test equipment. |
| Switching Frequency Range | 140kHz to 650kHz - adjustable via PLLLPF pin or external sync; higher frequencies reduce inductor size, lower frequencies improve efficiency. |
| Duty Cycle Max | 99.4% - enables ultra-low dropout operation (e.g., 12V→11.8V), critical for post-regulation in high-voltage systems. |
| Power-Good Threshold | ±10% on VFB - provides reliable rail monitoring with hysteresis, suitable for FPGA/CPU power sequencing. |
| Soft-Start Current | 1.0μA typical - sets controlled ramp rate via external capacitor, preventing inrush current in multi-rail systems. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed thermal pad (Pin 33 = SGND), rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1– / SENSE2– (1, 9) | Differential current sense (–) | Connects to low-side of sense resistor; enables accurate current limiting and foldback during short-circuit events. |
| TG1 / TG2 (26, 15) | Top N-MOSFET gate drive | Floating driver output with ~5V swing above SW node; requires bootstrap capacitor for high-side drive. |
| BG1 / BG2 (23, 18) | Bottom N-MOSFET gate drive | Ground-referenced driver (0V to INTVCC); directly drives synchronous rectifier MOSFETs. |
| VFB1 / VFB2 (31, 11) | Feedback input | Compares output voltage (via external divider) to 0.8V reference; determines regulation setpoint for each channel. |
| TRACK/SS1 / TRACK/SS2 (29, 13) | Soft-start & tracking control | Internal 1μA pull-up charges external cap for programmable ramp; also accepts external voltage for supply tracking during startup. |
| PLLIN/MODE (5) | Sync input / light-load mode select | Accepts external clock for phase-locking or DC voltage to configure Burst Mode®, pulse skip, or forced continuous conduction. |
| PGOOD1 / PGOOD2 (27, 28) | Open-drain status indicator | Pulled low when respective VFB deviates >±10% from target-used for system power sequencing and fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces RMS input ripple current by ~70%, cutting required input capacitance and EMI filter size. |
| OPTI-LOOP® compensation | Allows stable loop response across wide range of ceramic or polymer output capacitors (10μF–1000μF) and ESR (0.5mΩ–50mΩ). |
| Selectably optimized light-load efficiency | Burst Mode® achieves >85% efficiency at 1mA load; pulse skip maintains low ripple; forced continuous eliminates subharmonics. |
| Independent channel enable & tracking | RUN1/RUN2 allow staggered startup/shutdown; TRACK/SS pins support voltage sequencing between 3.3V and 8.5V rails. |
| Robust protection suite | Includes output overvoltage lockout (±12%), current foldback, undervoltage lockout (3.5V), and thermal shutdown (125°C junction). |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Dual-rail power for SoC (1.2V core) and display interface (3.3V I/O) in head-unit design with 12V battery input. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller providing isolated, sequenced 1.2V/3.3V outputs with PGOOD signaling for safe boot. Use Value: Out-of-phase operation minimizes input capacitor stress under cold-crank (6V) conditions; 80μA IQ preserves battery life during sleep mode. | Use Scenario: Distributed 5V and 24V auxiliary rails in modular PLC backplane with strict EMI limits. IC Role / Device Role / Timing Role: Dual controller managing separate 5V logic and 24V sensor excitation supplies, synchronized via CLKOUT daisy-chain. Use Value: Phase-lockable frequency allows harmonized switching across multiple LTC3827 units, suppressing beat frequencies in dense PCB layouts. |
| Medical Portable Ultrasound | Test & Measurement Equipment |
Use Scenario: Battery-backed analog front-end requiring ultra-low-noise 2.5V and 5V rails with tight transient response. IC Role / Device Role / Timing Role: Dual controller delivering low-ripple outputs using forced continuous mode and OPTI-LOOP® tuning for fast load-step recovery. Use Value: Continuous conduction eliminates audible noise and RF interference affecting sensitive ADC sampling; ±1% accuracy ensures calibrated signal chain integrity. | Use Scenario: Multi-output bench power supply with programmable soft-start and rail tracking for FPGA-based logic analyzers. IC Role / Device Role / Timing Role: Primary controller generating 1.8V and 3.3V from 12V input, with TRACK/SS pins tied to master reference for monotonic startup. Use Value: Independent soft-start prevents inrush-induced brownout on shared input bus; PGOOD signals enable automated self-test sequencing. |
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 |
|---|---|---|---|
| LTC3855IUFD#PBF | Single-channel, 4-phase capable; 4.5V–38V input; no integrated PLL; fixed 500kHz or resistor-programmable. | Lacks dual independent outputs and TRACK/SS per channel; better suited for single-rail, higher-current applications (e.g., GPU core). | Choose LTC3855 for higher phase count on one rail; LTC3827EUH#PBF remains preferred for true dual-rail independence and sequencing. |
| MP8866DQ-LF-P | Monolithic dual buck (integrated MOSFETs); 2.7V–16V input; max 6A/channel; no PLL or external sync; fixed 500kHz. | Lower BOM count but limited input range and no light-load mode flexibility; unsuitable for 24V automotive or high-VIN industrial use. | MP8866 fits space-constrained, low-input-voltage designs; LTC3827EUH#PBF offers superior voltage range, efficiency control, and thermal scalability via external FETs. |
Compared with LTC3855IUFD#PBF and MP8866DQ-LF-P, the LTC3827EUH#PBF uniquely combines dual independent controllers with full light-load mode selection, out-of-phase operation, and robust 4V–36V input capability-making it optimal for multi-rail, battery-sensitive, and high-reliability embedded power systems.
Availability
LTC3827EUH#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC modules, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3827EUH#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3827EUH#PBF belongs to ADI's Power by Linear™ controller family, engineered for high-efficiency, low-quiescent-current DC/DC conversion in demanding automotive, industrial, and battery-operated applications where reliability and precision regulation are critical.
FAQ
What is the maximum input voltage rating for the LTC3827EUH#PBF?
The LTC3827EUH#PBF has an absolute maximum input supply voltage (VIN) rating of 36V, with guaranteed operation from 4V to 36V. This wide range accommodates 12V and 24V automotive battery systems including cold-crank and load-dump transients when properly clamped externally. Exceeding 36V may cause permanent damage per Absolute Maximum Ratings.
How does the LTC3827EUH#PBF achieve low quiescent current in battery-powered applications?
The LTC3827EUH#PBF achieves 80μA no-load quiescent current (one channel active) through optimized biasing, sleep-mode circuitry, and selective shutdown of internal blocks during light loads. When both channels enter Burst Mode® sleep, total IQ rises to 115μA; full shutdown (both RUN pins low) reduces it to 8μA. This enables multi-week standby in portable instrumentation powered by Li-ion or alkaline cells.
Can the LTC3827EUH#PBF synchronize its switching frequency to an external clock source?
Yes, the LTC3827EUH#PBF supports external synchronization via the PLLIN/MODE pin. When driven by an external clock (115–800 kHz), the internal phase-locked loop aligns the rising edge of TG1 to the external clock's rising edge. An R-C filter must be connected to the PLLLPF pin to stabilize the loop. This feature enables EMI reduction and coordinated switching across multiple power stages in complex systems.
What protection features are integrated into the LTC3827EUH#PBF?
The LTC3827EUH#PBF integrates undervoltage lockout (3.5V), output overvoltage lockout (±12% on VFB), current foldback limiting, thermal shutdown (125°C junction), and reverse-current prevention via IR comparator. Foldback can be disabled per channel using the FOLDDIS pin. These protections safeguard external MOSFETs and downstream loads during fault conditions without requiring external circuitry.
Is the LTC3827EUH#PBF pin-compatible with other members of the LTC3827 family?
Yes, the LTC3827EUH#PBF shares identical pinout and footprint with all UH-package variants (e.g., LTC3827IUH#PBF), differing only in temperature grade (E-grade = –40°C to +85°C, I-grade = fully specified over same range). No PCB redesign is needed when upgrading between E and I versions, though system-level validation under worst-case temperature conditions is recommended for I-grade deployment.
LTC3827EUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 32-WFQFN Exposed Pad
- 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, Phase Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3827EUH#PBF FAQ
1.How can I place an order for LTC3827EUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3827EUH#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 LTC3827EUH#PBF reliable?
The price and inventory of LTC3827EUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3827EUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC3827EUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3827EUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3827EUH#PBF?
LTC3827EUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3827EUH#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 LTC3827EUH#PBF?
For technical support, including LTC3827EUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3827EUH#PBF requirements.
6.How does Aetrix verify that LTC3827EUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3827EUH#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 LTC3827EUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC3827EUH#PBF?
All LTC3827EUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3827EUH#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 LTC3827EUH#PBF part is unused and in its original packaging.
Return procedure for LTC3827EUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3827EUH#PBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
