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Analog Devices Inc. LTC7871JLWE#WPBF
- Part No.:
- LTC7871JLWE#WPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 64-LQFP Exposed Pad
- Datasheet:
-
LTC7871JLWE#WPBF.pdf
- Description:
- 6-PHASE BIDIRECTIONAL BUCK/BOOST
- Quantity:
- Payment:
- Shipping:
Inventory:106
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Product details
Overview
LTC7871JLWE#WPBF 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 (up to 100V) and VLOW (up to 60V), supports ±1% voltage regulation accuracy over temperature, delivers up to 24-phase scalability, and operates with external gate drivers and MOSFETs.
For engineers reviewing the LTC7871JLWE#WPBF datasheet, LTC7871JLWE#WPBF pinout, LTC7871JLWE#WPBF application, or LTC7871JLWE#WPBF equivalent, this page provides verified technical context, phase-locked frequency control (60–750 kHz), SPI-configurable current regulation, AEC-Q100-in-progress qualification, and thermal design guidance for 150°C junction operation.
Technical Context
The LTC7871JLWE#WPBF implements a proprietary constant-frequency current-mode architecture with independent buck and boost loop compensation, enabling precise bidirectional power flow control and excellent per-phase current matching. Its six PWM outputs are phase-shifted at 0°, 60°, 120°, 180°, 240°, and 300° relative to Phase 1, supporting interleaved operation up to 24 phases via synchronization.
It integrates dual error amplifiers (EA_VHIGH and EA_VLOW), programmable current limit via SETCUR (16 µA sourcing), accurate inductor current monitoring (IMON = 1.25 V at zero current), and fault reporting via open-drain FAULT and PGOOD pins with 40 µs and 120 µs delay respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VHIGH Range | 6 V to 100 V - supports primary rail in 48V automotive systems with headroom for transients. |
| VLOW Range | 1.2 V to 60 V - enables regulation of 12V auxiliary bus or intermediate voltages down to logic-level rails. |
| Voltage Regulation Accuracy | ±1% over temperature - ensures stable output under thermal stress in engine bay or under-hood environments. |
| Switching Frequency Range | 60 kHz to 750 kHz - configurable via FREQ pin resistor or external SYNC clock for EMI optimization. |
| Current Sense Threshold Range | 6.5 mV to 56 mV (RSENSE config) - sets max per-phase inductor current with 10% IMON gain tolerance. |
| Operating Junction Temp | –40°C to +150°C - qualified for high-reliability automotive applications requiring extended thermal margin. |
| SPI Interface | 4-wire, 5 MHz max SCLK - enables real-time configuration of margins, faults, and operating modes without hardware changes. |
Pinout & Package
The LTC7871JLWE#WPBF is housed in a thermally enhanced 64-lead (10 mm × 10 mm) LQFP package (LWE) with exposed SGND pad (Pin 65) that must be soldered to PCB ground for thermal performance (θJA = 17°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VHIGH (Pin 48) | Main high-side supply input | Accepts up to 100 V; powers internal circuitry and drives gate driver LDO when EXTVCC is inactive. |
| VFBHIGH / VFBLOW (Pins 7, 3) | Feedback inputs for VHIGH/VLOW regulation | High-impedance (–40 nA) inputs referenced to 1.2 V internal reference; enable precision closed-loop control. |
| ITHHIGH / ITHLOW (Pins 6, 4) | Current threshold and compensation nodes | Set peak current limit per phase; accept RC networks for independent buck/boost loop compensation. |
| PWM1–PWM6 (Pins 29, 31, 32, 33, 34, 36) | Top-gate drive outputs | Three-state compatible signals driving external gate drivers; phase-aligned with 60° offsets for interleaving. |
| SNSA1+–SNSA6+, SNSD1+–SNSD6+, SNS1––SNS6– (Pins 17–25, 56–64, 18–24, 57–63) | AC/DC current sense inputs | Separate paths for AC ripple (SNSA) and DC component (SNSD); SNS– tied to VLOW for bidirectional sensing. |
| SETCUR (Pin 11) | Programmable current limit reference | Sources 16 µA; sets maximum average inductor current via external resistor or SPI register. |
| IMON (Pin 10) | Bidirectional current monitor output | 1.25 V = zero net current; voltage scales linearly with total 6-phase average inductor current. |
| BUCK (Pin 54) | Mode selection control | Ground = boost mode (VLOW→VHIGH); float/V5 = buck mode (VHIGH→VLOW); enables dynamic direction switching. |
Key Features
| Feature | Design Value |
|---|---|
| Six-phase interleaved control | Reduces input/output ripple by >90% vs single-phase, lowers EMI and capacitor RMS current stress. |
| Independent buck/boost loop compensation | Enables optimized transient response and stability for both power flow directions without compromise. |
| SPI-configurable operation | Allows runtime adjustment of voltage/current margins, fault thresholds, spread spectrum, and phase count. |
| Accurate bidirectional current monitoring | IMON pin provides system-level current telemetry with ±10% gain tolerance and 1.25 V zero-current offset. |
| Thermally robust LQFP package | Exposed SGND pad and 17°C/W θJA support continuous 150°C junction operation in compact layouts. |
| AEC-Q100 qualification in progress | Meets automotive reliability requirements for temperature cycling, HTOL, and ESD robustness (HBM ≥ 2 kV). |
Applications
| Automotive 48V/12V Dual-Battery Systems | Backup Power Systems |
|---|---|
Use Scenario: Bidirectional energy transfer between 48V starter-generator and 12V chassis battery during regenerative braking or cold-cranking assist. IC Role / Device Role / Timing Role: Six-phase synchronous controller managing power flow direction, voltage regulation, and current limiting across both rails. Use Value: Enables >98% efficiency in both buck and boost modes, reducing thermal load and extending battery life in stop-start architectures. |
Use Scenario: Seamless failover between primary AC/DC supply and backup 48V battery bank in telecom or industrial UPS. IC Role / Device Role / Timing Role: Bidirectional regulator maintaining stable 12V output while dynamically sourcing/sinking current based on load demand and grid status. Use Value: Eliminates need for separate buck and boost controllers, simplifying BOM and layout while ensuring ±1% output accuracy during transitions. |
| High-Density Server VRMs | Energy Storage System (ESS) Interfaces |
Use Scenario: High-current CPU/GPU voltage regulation using multiphase interleaving to meet tight transient response specs. IC Role / Device Role / Timing Role: Master controller coordinating up to 24 phases across multiple LTC7871 ICs via CLKOUT/SYNC for sub-100 ns timing alignment. Use Value: Achieves <10 µs load-step response with minimal output capacitance due to fast current-mode control and phase interleaving. |
Use Scenario: Bidirectional DC-DC interface between lithium-ion battery stack (48–60 V) and 12V auxiliary loads or charging circuits. IC Role / Device Role / Timing Role: Regulates battery-to-load (buck) and load-to-battery (boost) power flow with overvoltage/undervoltage protection on both sides. Use Value: Supports programmable VHIGH/VLOW margining and real-time fault reporting via SPI, enabling predictive maintenance in ESS deployments. |
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 |
|---|---|---|---|
| LTC7872JLWE#WPBF | Enhanced version with integrated gate drivers (replaces external drivers), same pinout, higher integration density. | Reduces external component count but increases thermal dissipation on IC; requires careful layout for 150°C operation. | Select when board space is constrained and gate driver losses must be minimized; verify thermal margin with DRVCC loading. |
| MPQ8875A-AEC1 | Single-phase, 48V–12V synchronous buck-boost controller; no SPI, no multiphase capability, lower voltage rating (48V max). | Targeted at cost-sensitive, lower-power automotive modules where 6-phase scalability and bidirectional telemetry are unnecessary. | Select only for non-critical 12V/48V conversion below 30A; not suitable for high-efficiency or high-reliability dual-battery systems. |
Compared with LTC7871JLWE#WPBF, the LTC7872JLWE#WPBF offers integrated drivers but less flexibility in thermal management, while the MPQ8875A-AEC1 sacrifices phase count, programmability, and voltage range for cost-making LTC7871JLWE#WPBF optimal for scalable, high-performance automotive bidirectional power systems.
Availability
LTC7871JLWE#WPBF is available at Aetrix Electronics and suitable for automotive 48V/12V dual-battery systems, backup power systems, and high-density server VRMs requiring stable component supply, AEC-Q100-compliant reliability, and long-term lifecycle support.
Supply support for LTC7871JLWE#WPBF 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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LTC7871JLWE#WPBF belongs to Analog Devices' Power by Linear™ controller family, engineered specifically for high-efficiency, bidirectional DC-DC conversion in demanding automotive and industrial power architectures.
FAQ
What is the maximum junction temperature rating for the LTC7871JLWE#WPBF?
The LTC7871JLWE#WPBF is rated for continuous operation up to +150°C junction temperature, validated across the full –40°C to +150°C range. This J-grade qualification supports under-hood automotive deployment where ambient temperatures exceed 105°C, provided the exposed SGND pad is properly soldered and thermal vias are implemented per AN136.
How does the LTC7871JLWE#WPBF handle bidirectional power flow control?
The LTC7871JLWE#WPBF uses the BUCK pin to select direction: grounding it enables boost mode (VLOW → VHIGH), while floating or tying it to V5 enables buck mode (VHIGH → VLOW). Internal control logic maintains independent voltage regulation and current limiting in both directions, with seamless transition supported by shared current-sense architecture and synchronized PWM timing.
Can the LTC7871JLWE#WPBF operate without an external microcontroller?
Yes - the LTC7871JLWE#WPBF supports fully autonomous operation using resistor-programmed settings (FREQ, SETCUR, OV/UV thresholds) and hardware pins (BUCK, MODE, RUN). The SPI interface is optional for advanced features like real-time margining, fault logging, or dynamic phase shedding, but not required for basic bidirectional regulation.
What is the purpose of the SNSA and SNSD pin pairs on the LTC7871JLWE#WPBF?
The LTC7871JLWE#WPBF uses dual current-sense paths: SNSA+ pins capture high-frequency AC ripple for cycle-by-cycle current limiting, while SNSD+ pins sense the DC component for average current regulation and IMON telemetry. Both share SNS– as common return, enabling accurate bidirectional current measurement regardless of power flow direction.
Is the LTC7871JLWE#WPBF pin-compatible with other members of the LTC787x family?
The LTC7871JLWE#WPBF shares identical pinout and package with LTC7871ELWE#WPBF, LTC7871ILWE#WPBF, and LTC7871HLWE#WPBF. However, it is not pin-compatible with LTC7872JLWE#WPBF (which integrates gate drivers) or LTC7873 (which adds secondary-side sensing). Always verify temperature grade and automotive suffix (#WPBF) for mechanical and reliability equivalence.
LTC7871JLWE#WPBF 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)
LTC7871JLWE#WPBF FAQ
1.How can I place an order for LTC7871JLWE#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7871JLWE#WPBF 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 LTC7871JLWE#WPBF reliable?
The price and inventory of LTC7871JLWE#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7871JLWE#WPBF is usually 5 days.
3.What payment methods are accepted for LTC7871JLWE#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7871JLWE#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7871JLWE#WPBF?
LTC7871JLWE#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7871JLWE#WPBF 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 LTC7871JLWE#WPBF?
For technical support, including LTC7871JLWE#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7871JLWE#WPBF requirements.
6.How does Aetrix verify that LTC7871JLWE#WPBF is sourced from the original manufacturer or authorized distributors?
All LTC7871JLWE#WPBF 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 LTC7871JLWE#WPBF meets industry standards.
7.What is the process for return or replacement of LTC7871JLWE#WPBF?
All LTC7871JLWE#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7871JLWE#WPBF, 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 LTC7871JLWE#WPBF part is unused and in its original packaging.
Return procedure for LTC7871JLWE#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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