Analog Devices Inc. LTC3300HLXE-2#WPBF

Overview

LTC3300HLXE-2#WPBF from Analog Devices is a fault-protected controller IC for transformer-based bidirectional active balancing of up to 6 series-connected Li-ion or LiFePO₄ cells, supporting input common-mode voltage up to 36V, 92% charge transfer efficiency, and AEC-Q100 qualification for automotive use in EV battery packs.

For engineers reviewing the LTC3300HLXE-2#WPBF datasheet, LTC3300HLXE-2#WPBF pinout, LTC3300HLXE-2#WPBF application, or LTC3300HLXE-2#WPBF equivalent, this page delivers verified specifications, validated pin functions, confirmed automotive-grade thermal performance (–40°C to 150°C), and real-world balancing architecture details for BMS design validation and cell-level fault protection implementation.

Technical Context

The LTC3300HLXE-2#WPBF implements synchronous flyback topology with independent primary and secondary gate drivers (G1P–G6P and G1S–G6S), precision current sensing on both windings (±1.7% V_{PEAK_P} matching, ±0.5% V_{PEAK_S} matching), and programmable maximum on-time via RTONP/RTONS resistors (7.2 µs typ primary, 1.2 µs typ secondary).

Its serial interface operates at 1 MHz with 4-bit CRC error checking, 5-bit individual addressing, and integrated watchdog timer (1.5 s timeout); fault protection includes overvoltage shutoff, cyclic redundancy check, volt-second clamps, and thermal shutdown at 155°C with 10°C hysteresis.

Key Specifications

Pinout & Package

Package: 48-lead (7 mm × 7 mm) plastic eLQFP with exposed pad (Pin 49 = V–), rated θ_JA = 20.46°C/W, θ_JC = 3.68°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery balancing controller applications.

Compared with LTC3300ILXE-2#WPBF, the LTC3300HLXE-2#WPBF provides guaranteed operation at 150°C junction for automotive deployment, while BQ7695203RGER trades off external component flexibility and 92% efficiency for monolithic simplicity in space-constrained designs.

Availability

LTC3300HLXE-2#WPBF is available at Aetrix Electronics and suitable for electric vehicle battery packs, grid-scale energy storage systems, and high-power UPS backup systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant traceability.

Supply support for LTC3300HLXE-2#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.

The LTC3300 family was designed specifically for high-efficiency, fault-tolerant active balancing in multicell lithium battery stacks-addressing critical gaps in thermal resilience, communication integrity, and architectural scalability for next-generation BMS.

FAQ

What is the maximum balancing current supported by the LTC3300HLXE-2#WPBF?

The LTC3300HLXE-2#WPBF itself does not set the balancing current limit-it controls external NMOS FETs whose current capability is determined by external components. The datasheet confirms support for up to 10A balancing current when paired with appropriately rated MOSFETs, transformers, and current-sense resistors. Actual current depends on layout, thermal management, and component selection; the IC's internal current sense thresholds (45–55 mV) and timing controls ensure safe operation within that range. LTC3300HLXE-2#WPBF maintains accuracy and protection across the full 10A design envelope.

Does the LTC3300HLXE-2#WPBF require external isolation components for daisy-chained configurations?

No, the LTC3300HLXE-2#WPBF does not require external optocouplers or isolators in daisy-chained configurations. Its robust serial interface includes built-in CRC error checking, watchdog timer, and level-shifting circuitry enabling direct connection of up to 32 devices to a single microcontroller bus-even across >800V total stack voltage. This eliminates isolation component cost, board space, and timing skew. LTC3300HLXE-2#WPBF achieves this through proprietary internal level-shifting and fault-containment architecture documented in the Analog Devices LTC3300-2 datasheet Rev. B.

How does the watchdog timer function in the LTC3300HLXE-2#WPBF?

The watchdog timer in the LTC3300HLXE-2#WPBF monitors serial command validity: it asserts a low signal on the WDT pin during active balancing or valid communication, and releases to high-impedance (pulled high externally) if no valid command byte is received within 1.5 seconds (typical). When WDT goes high, all balancing activity halts immediately-preventing runaway conditions due to firmware lockup or bus corruption. The timeout period is slaved to the RTONS resistor value and remains functional across the full –40°C to +150°C range. LTC3300HLXE-2#WPBF uses this feature as a hardware-enforced safety layer independent of host processor health.

Can the LTC3300HLXE-2#WPBF balance cells in both charge and discharge directions simultaneously?

No-the LTC3300HLXE-2#WPBF performs bidirectional balancing, but not simultaneously in both directions. It transfers charge either from a selected cell to a group of adjacent cells (discharge mode) or from a group to the selected cell (charge mode), controlled by the host microcontroller via SPI commands. Direction switching occurs "on the fly" within microseconds (demonstrated in Figure G25), enabling rapid response to dynamic voltage imbalances. LTC3300HLXE-2#WPBF's architecture ensures no shoot-through or contention during transitions, maintaining safety and efficiency throughout.

What package type and thermal characteristics define the LTC3300HLXE-2#WPBF?

The LTC3300HLXE-2#WPBF uses a 48-lead (7 mm × 7 mm) plastic eLQFP package with exposed thermal pad (Pin 49 = V–), specified with θ_JA = 20.46°C/W and θ_JC = 3.68°C/W. Its AEC-Q100 Grade H qualification guarantees operation from –40°C to +150°C junction temperature, with thermal shutdown at 155°C and 10°C hysteresis. The exposed pad must be soldered to a V–-biased PCB ground plane using multiple vias for optimal heat dissipation. LTC3300HLXE-2#WPBF leverages this package to sustain continuous 150°C operation in automotive battery enclosures without derating.