SLUSCG5A May   2016  – July 2016

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Device Comparison Table
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Overvoltage-Protection (OVP) - Continuously Monitored
      2. 8.3.2  CHG Pin Indication (bq25101, bq25101H)
      3. 8.3.3  CHG Pin LED Pull-up Source (bq25101, bq25101H)
      4. 8.3.4  IN-DPM (VIN-DPM or IN-DPM)
      5. 8.3.5  OUT
      6. 8.3.6  ISET
      7. 8.3.7  PRE_TERM - Pre-Charge and Termination Programmable Threshold
      8. 8.3.8  TS
      9. 8.3.9  Timers
      10. 8.3.10 Termination
    4. 8.4 Device Functional Modes
      1. 8.4.1 Power-Down or Undervoltage Lockout (UVLO)
      2. 8.4.2 Power-up
      3. 8.4.3 Sleep Mode
      4. 8.4.4 New Charge Cycle
      5. 8.4.5 Termination and Timer Disable Mode (TTDM) - TS Pin High
      6. 8.4.6 Battery Detect Routine
      7. 8.4.7 Refresh Threshold
      8. 8.4.8 Starting a Charge on a Full Battery
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedures
        1. 9.2.2.1 Calculations
          1. 9.2.2.1.1 Program the Fast Charge Current, ISET:
          2. 9.2.2.1.2 Program the Termination Current Threshold, ITERM:
          3. 9.2.2.1.3 TS Function
          4. 9.2.2.1.4 Selecting IN and OUT Pin Capacitors
      3. 9.2.3 Application Performance Plots
  10. 10Power Supply Recommendations
    1. 10.1 Leakage Current Effects on Battery Capacity
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Thermal Considerations
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Related Links
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Community Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ(パッケージ|ピン)
サーマルパッド・メカニカル・データ
発注情報

9 Application and Implementation

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 bq25100B series of devices are highly integrated Li-Ion and Li-Pol linear chargers targeted at space-limited portable applications. The fast charge current can be programmed from 10 mA to 250 mA through an external resistor on ISET pin. The pre_charge and termination current can also be programmed through the resistor connected on PRETERM pin. The device has complete system-level protection such as input under-voltage lockout (UVLO), input over-voltage protection (OVP), sleep mode, thermal regulation, safety timers, and NTC monitoring input.

9.2 Typical Application

This typical application shows a charger application design example.

bq25100B App_Diag_luscg5.gif

9.2.1 Design Requirements

  • Supply voltage = 5 V
  • Fast charge current: IOUT-FC = 40 mA;
  • Termination Current Threshold: %IOUT-FC = 10% of Fast Charge or ~4 mA
  • Pre-Charge Current by default is twice the termination Current or ~8 mA
  • TS – Battery Temperature Sense = 10-k NTC (103AT)
  • CE is an open drain control pin

9.2.2 Detailed Design Procedures

  • The regulation voltage is set to 4.2 V, the input voltage is 5 V and the charge current is programmed to 40 mA.
  • For charge current that is below 50 mA, an extra RC circuit is recommended on ISET to acheive more stable current signal. For applications that need higher charge current, the RC circuit is not needed.
  • For applications that use more than 200-mA current, there could be a very low level ~1% of charge current ringing in the output. The ringing can be removed by increasing the input capacitance.

9.2.2.1 Calculations

9.2.2.1.1 Program the Fast Charge Current, ISET:

RISET = [K(ISET) / I(OUT)]
from electrical characteristics table. . . K(SET) = 135 AΩ
RISET = [135 AΩ/0.04 A] = 3.4 kΩ
Selecting the closest standard value, use a 3.4-kΩ resistor between ISET and Vss.

9.2.2.1.2 Program the Termination Current Threshold, ITERM:

RPRE-TERM = K(TERM) × %IOUT-FC
RPRE-TERM = 600 Ω/% × 10% = 6 kΩ
Selecting the closest standard value, use a 6-kΩ resistor between PRETERM and Vss.
One can arrive at the same value by using 20% for a pre-charge value (factor of 2 difference).
RPRE-TERM = K(PRE-CHG) × %IOUT-FC
RPRE-TERM = 300 Ω/% × 20%= 6 kΩ

9.2.2.1.3 TS Function

Use a 10-k NTC thermistor in the battery pack (103AT).

To Disable the temp sense function, use a fixed 10-kΩ resistor between the TS and VSS.

9.2.2.1.4 Selecting IN and OUT Pin Capacitors

In most applications, all that is needed is a high-frequency decoupling capacitor (ceramic) on the power pin, input and output pins. Using the values shown on the application diagram is recommended. After evaluation of these voltage signals with real system operational conditions, one can determine if capacitance values can be adjusted toward the minimum recommended values (DC load application) or higher values for fast, high amplitude, pulsed load applications. Note if designed for high input voltage sources (bad adaptors or wrong adaptors), the capacitor needs to be rated appropriately. Ceramic capacitors are tested to 2x their rated values so a 16-V capacitor may be adequate for a 30-V transient (verify tested rating with capacitor manufacturer).

9.2.3 Application Performance Plots

bq25100B scr_fig2_SLUSBV8.gif
Hot Plug
Figure 22. OVP 7-V Adaptor
bq25100B scr_fig4_SLUSBV8.gif
Figure 24. TS Enable and Disable
bq25100B scr_fig3_SLUSBV8.gif
VIN 0 V -5 V-7 V-5 V
Figure 23. OVP from Normal Power-Up Operation
bq25100B scr_fig12_SLUSBV8.gif
90-mA Load, 120-mA IOUT
Figure 25. Power Up