SLUSFH5
May 2024
BQ25856-Q1
ADVANCE INFORMATION
1
1
Features
2
Applications
3
Description
4
Pin Configuration and Functions
5
Specifications
5.1
Absolute Maximum Ratings
5.2
ESD Ratings
5.3
Recommended Operating Conditions
5.4
Thermal Information
5.5
Electrical Characteristics
5.6
Timing Requirements
5.7
Typical Characteristics
6
Detailed Description
6.1
Overview
6.2
Functional Block Diagram
6.3
Feature Description
6.3.1
Device Power-On-Reset
6.3.2
Device Power-Up From Battery Without Input Source
6.3.3
Device Power Up from Input Source
6.3.3.1
VAC Operating Window Programming (ACUV and ACOV)
6.3.3.2
REGN Regulator (REGN LDO)
6.3.3.3
Compensation-Free Buck-Boost Converter Operation
6.3.3.3.1
Light-Load Operation
6.3.3.4
Switching Frequency and Synchronization (FSW_SYNC)
6.3.3.5
Device HIZ Mode
6.3.4
Battery Charging Management
6.3.4.1
Autonomous Charging Cycle
6.3.4.1.1
Charge Current Programming (ICHG pin and ICHG_REG)
6.3.4.2
Li-Ion Battery Charging Profile
6.3.4.3
LiFePO4 Battery Charging Profile
6.3.4.4
Charging Termination for Li-ion and LiFePO4
6.3.4.5
Charging Safety Timer
6.3.4.6
Thermistor Qualification
6.3.4.6.1
JEITA Guideline Compliance in Charge Mode
6.3.4.6.2
Cold/Hot Temperature Window in Reverse Mode
6.3.5
Power Management
6.3.5.1
Dynamic Power Management: Input Voltage and Input Current Regulation
6.3.5.1.1
Input Current Regulation
6.3.5.1.1.1
ILIM_HIZ Pin
6.3.5.1.2
Input Voltage Regulation
6.3.6
Switching Frequency and Dithering Feature
6.3.7
Reverse Mode Power Direction
6.3.8
Integrated 16-Bit ADC for Monitoring
6.3.9
Status Outputs (PG, STAT1, STAT2, and INT)
6.3.9.1
Power Good Indicator (PG)
6.3.9.2
Charging Status Indicator (STAT1, STAT2 Pins)
6.3.9.3
Interrupt to Host (INT)
6.3.10
Protections
6.3.10.1
Voltage and Current Monitoring
6.3.10.1.1
VAC Over-voltage Protection (VAC_OVP)
6.3.10.1.2
VAC Under-voltage Protection (VAC_UVP)
6.3.10.1.3
Battery Over-voltage Protection (BAT_OVP)
6.3.10.1.4
Battery Over-current Protection (BAT_OCP)
6.3.10.1.5
Reverse Mode Over-voltage Protection (REV_OVP)
6.3.10.1.6
Reverse Mode Under-voltage Protection (REV_UVP)
6.3.10.1.7
DRV_SUP Under-voltage and Over-voltage Protection (DRV_OKZ)
6.3.10.1.8
REGN Under-voltage Protection (REGN_OKZ)
6.3.10.2
Thermal Shutdown (TSHUT)
6.3.11
Serial Interface
6.3.11.1
Data Validity
6.3.11.2
START and STOP Conditions
6.3.11.3
Byte Format
6.3.11.4
Acknowledge (ACK) and Not Acknowledge (NACK)
6.3.11.5
Target Address and Data Direction Bit
6.3.11.6
Single Write and Read
6.3.11.7
Multi-Write and Multi-Read
6.4
Device Functional Modes
6.4.1
Host Mode and Default Mode
6.4.2
Register Bit Reset
6.5
BQ25856-Q1 Registers
7
Application and Implementation
7.1
Application Information
7.2
Typical Applications
7.2.1
Typical Application
7.2.1.1
Design Requirements
7.2.1.2
Detailed Design Procedure
7.2.1.2.1
ACUV / ACOV Input Voltage Operating Window Programming
7.2.1.2.2
Charge Voltage Selection
7.2.1.2.3
Switching Frequency Selection
7.2.1.2.4
Inductor Selection
7.2.1.2.5
Input (VAC) Capacitor
7.2.1.2.6
Output (VBAT) Capacitor
7.2.1.2.7
Sense Resistor (RAC_SNS and RBAT_SNS) and Current Programming
7.2.1.2.8
Power MOSFETs Selection
7.2.1.2.9
Converter Fast Transient Response
7.2.2
Typical Application (4s LiFePO4 car battery configuration)
7.2.2.1
Design Requirements
8
Power Supply Recommendations
9
Layout
9.1
Layout Guidelines
9.2
Layout Example
10
Device and Documentation Support
10.1
Device Support
10.1.1
Third-Party Products Disclaimer
10.2
Receiving Notification of Documentation Updates
10.3
Support Resources
10.4
Trademarks
10.5
Electrostatic Discharge Caution
10.6
Glossary
11
Revision History
12
Mechanical, Packaging, and Orderable Information
12.1
Packaging Information
12.2
Tape and Reel Information
12.3
Mechanical Data
デバイスごとのパッケージ図は、PDF版データシートをご参照ください。
メカニカル・データ(パッケージ|ピン)
RRV|36
サーマルパッド・メカニカル・データ
1
Features
AEC-Q100 qualified for automotive applications
Temperature grade 1: −40ºC ≤ T
A
≤ 150ºC
Wide input voltage operating range: 4.2V to
70V
Wide battery voltage operating range: up-to 70V with multi-chemistry support:
1- to 14-cell Li-ion charge profile
1- to 16-cell LiFePO
4
charge profile
Up-to 70V supercapacitor charging
Synchronous buck-boost
charge
controller with NFET drivers
Adjustable
f
SW
from 200kHz to 600kHz
Switching frequency dithering for EMI noise reduction (DRSS)
Optional synchronization to external clock
Integrated loop compensation with soft start
Optional gate driver supply input for optimized efficiency
Bidirectional converter operation (Reverse Mode) supporting USB-PD Extended Power Range (EPR)
Adjustable input voltage (VAC) regulation from 3.3V to 65V with 20mV/step
Adjustable input current regulation (R
AC_SNS
) from 0.4A to 20A with 50mA/step using 5mΩ resistor
High accuracy
±0.5% charge
voltage regulation
±3% charge
/input current regulation
±2% input voltage regulation
I
2
C controlled for optimal system performance with resistor-programmable option
Hardware adjustable input and output current limits
Integrated
16-bit
ADC for voltage, current, and temperature monitoring
High safety integration
Adjustable input over- and under-voltage protection
Battery
overvoltage and overcurrent protection
Charging safety timer
Thermal shutdown
Status outputs
Input power present status (
PG
)
Charger
operation status
(STAT1, STAT2)
Package
36-pin 5mm × 6mm QFN with wettable flanks
Functional Safety-Capable
Documentation available to aid functional safety system design