BQ25700A Datasheet, PDF (64/82 Pages) Texas Instruments – SMBus Multi-Chemistry Battery Buck-Boost Charge Controller With System Power Monitor and Processor Hot Monitor

bq25700A
SLUSCQ8 – MAY 2017
9 Application and Implementation
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NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The bq2570xEVM-732 evaluation module (EVM) is a complete charger module for evaluating the bq25700A. The
application curves were taken using the bq2570xEVM-732. Refer to the EVM user's guide (SLUUBG6) for EVM
information.
9.2 Typical Application
ADAPTER
RAC=10m:
2.2uH
:
1PF
6x10PF
10: 10:
10nF _Q1
Q2
Q3
Q4
47nF
47nF
Optional
snubber
15nF
REGN
15nF
10:
1uF
1:
470nF
HIDRV1
SW1BTST1 BTST2 SW2
HIDRV2
VBUS ^LODRV1
LODRV2
SYS
ACN
ACP
VDDA
ILIM_HIZ
BATDRV
SRP
SRN
REGN
COMP1
bq25700A
GND
CELL_BATPRESZ
50:
1.05V
COMP2
CHRG_OK CMPOUT
PROCHOT SDA SCL
EN_OTG CMPIN
IADPT
IBAT
PSYS
To CPU
3.3V or 1.8V
10k:
10k:
10k:
10k:
6x10PF
VSYS
RSR=10m:
2.2±3.3uF
VDDA
350k:
250k:
30k:
100pF 100pF 100k:
BATT
Host
(SMBus)
Figure 40. Application Diagram
Copyright © 2017, Texas Instruments Incorporated
9.2.1 Design Requirements
DESIGN PARAMETER
Input Voltage⁽¹⁾
Input Current Limit ⁽¹⁾
Battery Charge Voltage⁽²⁾
EXAMPLE VALUE
3.5 V < Adapter Voltage < 24 V
3.2 A for 65 W adapter
8400 mV for 2s battery
(1) Refer to adapter specification for settings for Input Voltage and Input Current Limit.
(2) Refer to battery specification for settings.
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