Multiphase bidirectional current controller


Product details


Topology Boost, Buck Vin (Min) (V) 0.1 Vin (Max) (V) 100 Vout (Min) (V) 0.1 Vout (Max) (V) 100 Duty cycle (Max) (%) 99 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 500 Iq (Typ) (mA) 1 Features Adjustable Current Limit, Adjustable UVLO, Enable, Frequency Synchronization, Light Load Efficiency, Load Disconnect, Multiple Outputs, Phase Interleaving, Power Good, Synchronous Rectification, UVLO Adjustable Iout (Max) (A) 50 Operating temperature range (C) -40 to 125 Rating Catalog open-in-new Find other Buck-boost & inverting controllers (external switch)

Package | Pins | Size

HTQFP (PHP) 48 81 mm² 9 x 9 open-in-new Find other Buck-boost & inverting controllers (external switch)


  • Suited for high power industrial dual battery system
    • 100-V HV-port and 65-V LV-port max ratings
    • 1% Accurate bidirectional current regulation
    • 1% Accurate channel current monitoring
    • 5-A Peak half-bridge gate drivers
    • Support multi-phase operation with stackability
    • Diode emulation prevents negative current
  • Programmability and flexibility
    • Programmable or adaptive dead-time control
    • Programmable oscillator frequency with optional synchronization to external clock
    • Dual channel enable control inputs
    • Analog and PWM current controls
    • Programmable peak current limit
    • Programmable soft-start timer
    • Phase adding or dropping using EN2
  • Integrated protection features
    • HV and LV port over-voltage protection
    • MOSFET failure detect at start-up and circuit breaker control
    • Thermal shutdown

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The LM5170 controller provides the essential high voltage and precision elements of a dual-channel bidirectional converter. It regulates the average current flowing between the high voltage and low voltage ports in the direction designated by the DIR input signal. The current regulation level is programmed through analog or digital PWM inputs.

Dual-channel differential current sense amplifiers and dedicated channel current monitors achieve typical current accuracy of 1%. Robust 5-A half-bridge gate drivers are capable of driving parallel MOSFET switches delivering 500 W or more per channel. The diode emulation mode of the synchronous rectifiers prevents negative currents but also enables discontinuous mode operation for improved efficiency with light loads. Versatile protection features include cycle-by-cycle current limiting, overvoltage protection at both HV and LV ports, MOSFET failure detection and over-temperature protection.

An innovative average current mode control scheme maintains constant loop gain allowing a single R-C network to compensate both buck and boost conversion. The oscillator is adjustable up to 500 kHz and can synchronize to an external clock. Multiphase parallel operation is achieved by connecting two LM5170 controllers for 3- or 4-phase operation, or by synchronizing multiple controllers to phase-shifted clocks for a higher number of phases. A low state on the UVLO pin disables the LM5170 in a low current shutdown mode.

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Technical documentation

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No results found. Please clear your search and try again. View all 3
Type Title Date
* Datasheet LM5170 Multiphase Bidirectional Current Controller datasheet Jul. 09, 2019
Technical articles Four-switch buck-boost layout tip No. 4: routing gate-drive and return paths Feb. 20, 2019
Technical articles Achieving highly accurate full-scale charge and discharge current control for high-cell Li-ion battery-formation testing Aug. 13, 2018

Design & development

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Hardware development

document-generic User guide
The LM5170EVM-BIDIR is a high performance dual phase bi-directional converter ideal for 48V-12V dual battery system applications.  The two phases operate in 180degree interleaved operation, and they evenly share a max dc current of up to 60A.  When DIR is set to "1" the power flows from (...)
  • Buck Mode: 48V-port voltage range 6V to 75V;  12V-port voltge regulated at 14.5V
  • Boost Mode: 12V-port voltage range 3V to 48V;  48V-port voltge regulated at 50.5V
  • Max dc current into or out of the 12V-port is 60A
  • Built-in analog voltage loop control, while it also accept MCU digital voltage loop control (...)

Design tools & simulation

SNVMB14A.ZIP (154 KB) - PSpice Model
SNVMB67.TSC (592 KB) - TINA-TI Reference Design
SNVMB68.ZIP (132 KB) - TINA-TI Spice Model

CAD/CAE symbols

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HTQFP (PHP) 48 View options

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