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LM5170 Datasheet

Multiphase Bidirectional Current Controller

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LM5170
SNVSBJ0A – DECEMBER 2019 – REVISED JUNE 2020
LM5170 Multiphase Bidirectional Current Controller
1 Features
1 Functional Safety-Capable
Documentation available to aid functional
safety system design
• 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
Simplified Application Circuit
HV-Port
(48 V)
LV-Port
(12 V)
2 Applications
Battery tester
Bi-directional battery management system
Backup battery powered converters
Stackable buck or boost converters
Negative to positive voltage converter
3 Description
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 overtemperature protection.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM5170
TQFP (48)
7.00 mm × 7.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Channel Current Tracking ISETA Command
+10 V Bias
HO1 SW1 LO1
VIN
VINX
PGND
RAMP1
OVPA
RAMP2
SYNCOUT
ISETD
SYNCIN
ISETA
DIR
EN1
EN2
HO2 SW2 LO2
VCC
CSA1
CSB1
IOUT1
IOUT2
IPK
OSC
AGND
OVPB
CSB2
CSA2
GND
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.




etcTI

LM5170 Datasheet Preview

LM5170 Datasheet

Multiphase Bidirectional Current Controller

No Preview Available !

LM5170
SNVSBJ0A – DECEMBER 2019 – REVISED JUNE 2020
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Description (continued)......................................... 3
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 6
7.1 Absolute Maximum Ratings ...................................... 6
7.2 ESD Ratings ............................................................ 6
7.3 Recommended Operating Conditions....................... 6
7.4 Thermal Information .................................................. 7
7.5 Electrical Characteristics........................................... 7
7.6 Typical Characteristics ............................................ 11
8 Detailed Description ............................................ 14
8.1 Overview ................................................................. 14
8.2 Functional Block Diagram ....................................... 15
8.3 Feature Description................................................. 16
8.4 Device Functional Modes........................................ 32
8.5 Programming........................................................... 37
9 Application and Implementation ........................ 39
9.1 Application Information............................................ 39
9.2 Typical Application .................................................. 47
10 Power Supply Recommendations ..................... 58
11 Layout................................................................... 59
11.1 Layout Guidelines ................................................. 59
11.2 Layout Examples................................................... 60
12 Device and Documentation Support ................. 63
12.1 Device Support...................................................... 63
12.2 Receiving Notification of Documentation Updates 63
12.3 Support Resources ............................................... 63
12.4 Trademarks ........................................................... 63
12.5 Electrostatic Discharge Caution ............................ 63
12.6 Glossary ................................................................ 63
13 Mechanical, Packaging, and Orderable
Information ........................................................... 63
4 Revision History
Changes from Original (November 2019) to Revision A
Page
• Added functional safety bullet to the Features ...................................................................................................................... 1
2
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Product Folder Links: LM5170
Copyright © 2019–2020, Texas Instruments Incorporated



Part Number LM5170
Description Multiphase Bidirectional Current Controller
Maker etcTI
Total Page 3 Pages
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LM5170 Datasheet PDF





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