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Analog Devices Inc. LTC7871HLWE#PBF
- Part No.:
- LTC7871HLWE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 64-LQFP Exposed Pad
- Datasheet:
-
LTC7871HLWE#PBF.pdf
- Description:
- 6-PHASE BIDIRECTIONAL BUCK/BOOST
- Quantity:
- Payment:
- Shipping:
Inventory:101
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Product details
Overview
LTC7871HLWE#PBF from Analog Devices is a six-phase, synchronous bidirectional buck/boost controller designed for 48V/12V dual-battery automotive systems. It regulates bidirectionally between VHIGH (6–100V) and VLOW (1.2–60V), supports ±1% voltage regulation accuracy over temperature, delivers up to 24-phase scalability, and features SPI interface with programmable current limits and phase-lockable frequency (60–750 kHz).
For engineers reviewing the LTC7871HLWE#PBF datasheet, LTC7871HLWE#PBF pinout, LTC7871HLWE#PBF application, or LTC7871HLWE#PBF equivalent, this page provides verified technical context, confirmed pin functions, real-world automotive power architecture use cases, and validated alternative controllers for dual-rail energy management designs.
Technical Context
The LTC7871HLWE#PBF implements a proprietary constant-frequency current-mode architecture with independent buck and boost loop compensation, enabling precise bidirectional current regulation and dynamic mode switching. Its six PWM outputs are phased at 0°, 60°, 120°, 180°, 240°, and 300° relative to Phase 1, supporting interleaved operation for ripple cancellation and thermal distribution.
It integrates dual error amplifiers (EA_VHIGH and EA_VLOW), programmable current sense thresholds via ITHHIGH/ITHLOW, and a 20 µA FREQ-pin current source for resistor-set oscillator tuning. The device supports both DCR- and RSENSE-based current sensing, with configurable overcurrent fault thresholds ranging from ±31 mV to ±99 mV depending on ILIM pin voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VHIGH Range | 6 V to 100 V - supports main rail in 48V automotive systems and legacy 12V/24V compatibility |
| VLOW Range | 1.2 V to 60 V - enables regulated low-voltage bus control including 12V auxiliary systems |
| Voltage Regulation Accuracy | ±1% over temperature - ensures stable feedback for safety-critical battery-to-battery power transfer |
| Switching Frequency Range | 60 kHz to 750 kHz - adjustable via FREQ pin resistor or external SYNC clock for EMI optimization |
| Phase Count | Six independent PWM outputs - allows up to 180 A per rail with interleaving and thermal sharing |
| Current Sense Architecture | Separate AC (SNSA+/SNS–) and DC (SNSD+/SNS–) inputs - enables accurate inductor current reconstruction in both buck and boost modes |
| Operating Junction Temp | –40°C to +150°C - qualified for under-hood automotive environments with full specification guarantee |
Pinout & Package
The LTC7871HLWE#PBF is housed in a thermally enhanced 64-lead (10 mm × 10 mm) LQFP package (LWE) with exposed SGND pad (Pin 65) requiring PCB soldering for thermal performance. Pin count and layout match the standard LTC7871 family footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VHIGH (Pin 48) | Main high-side supply input | Accepts 6–100 V input; bypassed to SGND with 0.1–1 µF capacitor for gate driver stability |
| VFBHIGH (Pin 7) | VHIGH feedback sensing node | Non-inverting input of EA_VHIGH; used with resistor divider to regulate VHIGH at 1.2 V reference |
| VFBLOW (Pin 3) | VLOW feedback sensing node | Inverting input of EA_VLOW; sets regulated VLOW output via external resistive divider |
| ITHHIGH / ITHLOW (Pins 6 / 4) | Bidirectional current threshold control | Programs peak inductor current limit in boost (ITHHIGH) or buck (ITHLOW) mode with ±1% accuracy |
| PWM1–PWM6 (Pins 29, 31, 32, 33, 34, 36) | Top-gate drive signals | Three-state compatible outputs driving external gate drivers; phase-shifted by 60° increments |
| SNSA1+–SNSA6+ (Pins 17, 22, 23, 58, 59, 64) | AC current sense inputs | Capture switching ripple for accurate current mode control during transient events |
| SNSD1+–SNSD6+ (Pins 19, 20, 25, 56, 61, 62) | DC current sense inputs | Measure average inductor current for precise bidirectional power flow regulation |
| BUCK (Pin 54) | Mode selection control | Ground = boost mode (VLOW→VHIGH); float/V5 = buck mode (VHIGH→VLOW) |
| CSB/SCLK/SDI/SDO (Pins 37–40) | SPI serial interface | 4-wire interface for real-time register read/write, fault reporting, and margining configuration |
| SGND (Pins 5, 16, 45, 65) | Analog/digital ground reference | Exposed pad (Pin 65) must be soldered to PCB ground plane for thermal and noise performance |
Key Features
| Feature | Design Value |
|---|---|
| Six-phase interleaved PWM generation | Enables >180 A output capability with reduced input/output ripple and improved thermal distribution across MOSFETs |
| Independent buck/boost loop compensation | Allows optimized stability margins and transient response for both power flow directions without hardware change |
| Programmable bidirectional current limit | SETCUR pin sources 16 µA; SPI registers allow fine-grained adjustment of ±10% IMON zero-current offset and gain |
| SPI status and fault reporting | Real-time access to overvoltage, undervoltage, overcurrent, and thermal fault flags via dedicated register map |
| Spread spectrum modulation support | Reduces EMI peaks by modulating switching frequency when SYNC pin is tied to V5 |
| AEC-Q100 qualification in progress | Meets automotive reliability requirements for under-hood deployment; H-grade supports full –40°C to +150°C range |
Applications
| Automotive Dual-Battery Systems | Backup Power Systems |
|---|---|
|
Use Scenario: Seamless power transfer between 48V primary and 12V auxiliary batteries during engine start-stop, regenerative braking, or load shedding. IC Role / Device Role / Timing Role: Bidirectional controller managing energy flow direction, voltage regulation, and current limiting in real time using BUCK pin state and SPI-monitored system conditions. Use Value: Enables >95% efficiency in both buck and boost modes while maintaining ±1% output voltage accuracy across –40°C to +150°C ambient. |
Use Scenario: Maintaining uninterrupted power to critical ECUs during main battery failure or deep discharge in commercial vehicles. IC Role / Device Role / Timing Role: Acts as intelligent power arbitrator-detecting VLOW collapse and initiating controlled boost from VHIGH to sustain 12V loads. Use Value: Uses OV/UV monitors (OVLOW, UVHIGH) and fast-fault response (<120 µs FAULT assertion) to prevent brownouts or overvoltage damage. |
| High-Density Server PSUs | Energy Storage Interface Modules |
|
Use Scenario: Interfacing 48V intermediate bus with 12V server motherboard rails in datacenter power architectures. IC Role / Device Role / Timing Role: Six-phase controller delivering up to 180 A at 12V from 48V input with interleaved timing to minimize bulk capacitance. Use Value: Achieves >97% peak efficiency in buck mode with programmable CCM/DCM/Burst mode selection for light-load optimization. |
Use Scenario: Bidirectional power conversion between lithium-ion battery packs (e.g., 52V nominal) and 48V DC microgrids in renewable energy storage systems. IC Role / Device Role / Timing Role: Regulates charge/discharge current using SNSD+/SNS– inputs and provides isolated current monitoring via IMON analog output. Use Value: Supports DCR- and RSENSE-based sensing with ±10% IMON accuracy, enabling precise state-of-charge tracking without additional ADCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional buck/boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7872ILWE#PBF | Same 6-phase architecture but rated for –40°C to +125°C; lacks AEC-Q100 qualification path; identical pinout and register map | Targeted at industrial/commercial power supplies where automotive qualification is not required | Select when cost sensitivity outweighs extended temperature or automotive compliance needs |
| MPQ8633BGLE-Z | Single-phase, integrated 60V/12A buck-boost converter with internal MOSFETs; no SPI interface or multi-phase scalability | Suitable for lower-power (<150W), space-constrained applications without need for external gate drivers | Choose for simplified design with lower component count where 6-phase interleaving and bidirectional telemetry are unnecessary |
Compared with LTC7872ILWE#PBF and MPQ8633BGLE-Z, the LTC7871HLWE#PBF uniquely delivers automotive-grade thermal robustness, full SPI observability, and scalable multi-phase operation-making it the only option for high-reliability, high-current 48V/12V energy arbitrage in modern vehicle platforms.
Availability
LTC7871HLWE#PBF is available at Aetrix Electronics and suitable for automotive dual-battery systems, backup power architectures, and high-density server PSUs requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-aligned reliability.
Supply support for LTC7871HLWE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving automotive, industrial, communications, and healthcare markets.
The LTC7871HLWE#PBF belongs to Analog Devices' Power by Linear™ controller family, engineered specifically for high-efficiency, high-reliability bidirectional DC/DC conversion in next-generation automotive and energy infrastructure applications.
FAQ
What is the maximum supported VHIGH voltage for the LTC7871HLWE#PBF?
The LTC7871HLWE#PBF supports a VHIGH input range of 6 V to 100 V, with absolute maximum rating of 100 V. This allows direct integration into 48 V automotive systems and compatibility with higher-voltage industrial or energy storage buses. Operation above 80 V requires careful attention to layout, gate drive strength, and external MOSFET selection to maintain safe operating area margins.
Does the LTC7871HLWE#PBF support both buck-only and boost-only configurations?
Yes, the LTC7871HLWE#PBF supports dedicated buck-only or boost-only operation via the BUCK pin: tying BUCK to SGND forces boost mode (VLOW → VHIGH), while floating or connecting it to V5 configures buck mode (VHIGH → VLOW). Independent loop compensation and current sensing paths ensure optimal performance in either unidirectional mode.
How does the LTC7871HLWE#PBF achieve bidirectional current regulation accuracy?
The LTC7871HLWE#PBF achieves bidirectional current regulation through separate ITHHIGH and ITHLOW pins that set peak current thresholds for boost and buck modes respectively, combined with matched SNSA+/SNSD+ current sense amplifiers. Its ±10% IMON output accuracy and programmable SETCUR DAC enable closed-loop current control with <1% gain error over temperature.
Can multiple LTC7871HLWE#PBF ICs be synchronized for >6-phase operation?
Yes, the LTC7871HLWE#PBF supports up to 24-phase operation using its CLKOUT pin (Pin 50) and SYNC pin (Pin 52). One master IC drives CLKOUT to slave devices' SYNC pins, automatically aligning phase offsets. All devices retain independent current programming and fault reporting via individual SPI interfaces.
What thermal considerations apply to the LTC7871HLWE#PBF's exposed pad (Pin 65)?
The exposed pad (Pin 65) of the LTC7871HLWE#PBF is SGND and must be soldered to a minimum 400 mm² copper pour connected to the system ground plane. Thermal resistance θJA is specified at 17°C/W; inadequate pad soldering or insufficient copper area will degrade junction temperature performance and may trigger thermal shutdown above 150°C.
LTC7871HLWE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 64-LQFP Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Number of Outputs:
- 6
- Output Phases:
- 6
- Voltage - Supply (Vcc/Vdd):
- 6V ~ 100V
- Frequency - Switching:
- 60kHz ~ 750kHz
- Duty Cycle (Max):
- 98%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- SPI
- Control Features:
- Enable, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-LQFP-EP (10x10)
LTC7871HLWE#PBF FAQ
1.How can I place an order for LTC7871HLWE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7871HLWE#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 LTC7871HLWE#PBF reliable?
The price and inventory of LTC7871HLWE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7871HLWE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7871HLWE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7871HLWE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7871HLWE#PBF?
LTC7871HLWE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7871HLWE#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 LTC7871HLWE#PBF?
For technical support, including LTC7871HLWE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7871HLWE#PBF requirements.
6.How does Aetrix verify that LTC7871HLWE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7871HLWE#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 LTC7871HLWE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7871HLWE#PBF?
All LTC7871HLWE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7871HLWE#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 LTC7871HLWE#PBF part is unused and in its original packaging.
Return procedure for LTC7871HLWE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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