SLUSBH2G March   2013  – March 2019

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application Schematic
      2.      Charger Efficiency vs Input Voltage
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Electrical Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Maximum Power Point Tracking
      2. 7.3.2 Battery Undervoltage Protection
      3. 7.3.3 Battery Overvoltage Protection
      4. 7.3.4 Battery Voltage within Operating Range (VBAT_OK Output)
      5. 7.3.5 Storage Element / Battery Management
      6. 7.3.6 Programming OUT Regulation Voltage
      7. 7.3.7 Step Down (Buck) Converter
      8. 7.3.8 Nano-Power Management and Efficiency
    4. 7.4 Device Functional Modes
      1. 7.4.1 Main Boost Charger Disabled (Ship Mode) - (VSTOR > VSTOR_CHGEN and EN = HIGH)
      2. 7.4.2 Cold-Start Operation (VSTOR < VSTOR_CHGEN, VIN_DC > VIN(CS) and PIN > PIN(CS), EN = don't care)
      3. 7.4.3 Main Boost Charger Enabled (VSTOR > VSTOR_CHGEN and EN = LOW )
        1. 7.4.3.1 Buck Converter Enabled (VSTOR > VBAT_UV, EN = LOW and VOUT_EN = HIGH )
      4. 7.4.4 Thermal Shutdown
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Energy Harvester Selection
      2. 8.1.2 Storage Element Selection
      3. 8.1.3 Inductor Selection
        1. 8.1.3.1 Boost Charger Inductor Selection
        2. 8.1.3.2 Buck Converter Inductor Selection
      4. 8.1.4 Capacitor Selection
        1. 8.1.4.1 VREF_SAMP Capacitance
        2. 8.1.4.2 VIN_DC Capacitance
        3. 8.1.4.3 VSTOR Capacitance
        4. 8.1.4.4 VOUT Capacitance
        5. 8.1.4.5 Additional Capacitance on VSTOR or VBAT
    2. 8.2 Typical Applications
      1. 8.2.1 Solar Application Circuit
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
      2. 8.2.2 TEG Application Circuit
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curves
      3. 8.2.3 Piezoelectric Application Circuit
        1. 8.2.3.1 Design Requirements
        2. 8.2.3.2 Detailed Design Procedure
        3. 8.2.3.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.7 Typical Characteristics

Unless otherwise noted, graphs were taken using Figure 24 with CIN = 4.7µF, L1 = Coilcraft 22µH LPS4018, CSTOR = 4.7µF, L2 = Toko 10 µH DFE252012C, COUT = 22µF, VBAT_OV=4.2V, VOUT=1.8V

Table 1. Table of Graphs

FIGURE
Charger Efficiency (η)(1) vs. Input Voltage IN= 10 µA Figure 1
IN= 100 µA Figure 2
IIN = 10 mA Figure 3
vs. Input Current VIN = 2.0 V Figure 4
VIN = 1.0 V Figure 5
VIN = 0.5 V Figure 6
VIN = 0.2 V Figure 7
VSTOR Quiescent Current vs. VSTOR Voltage EN = 1, VOUT_EN = X (Ship Mode) Figure 8
EN = 0, VOUT_EN = 0 (Standby Mode) Figure 9
VBAT Quiescent Current vs. VBAT Voltage EN = 0, VOUT_EN = 1 (Active Mode) Figure 10
Buck Efficiency (η) vs. Output Current Figure 11
vs. Input Voltage Figure 12
Normalized Buck Output Voltage vs. Output Current Figure 13
vs. Input Voltage Figure 14
vs. Temperature Figure 15
Buck Maximum Output Current vs. Input Voltage VOUT = 1.8V - 100mV Figure 16
Buck Major Switching Frequency vs. Output Current Figure 17
vs. Input Voltage Figure 18
Buck Output Ripple vs.Output Current Figure 19
vs. Input Voltage Figure 20
(1) See SLUA691 for an explanation on how to take these measurements. Because the MPPT feature cannot be disabled on the bq25570, these measurements need to be taken in the middle of the 16 s sampling period.
bq25570 C001_SLUSBH2.png
VIN_DC = sourcemeter configured with ICOMP = 10 µA and outputing 0 to 3.0 V
VSTOR = sourcemeter configured to measure current and voltage source set to hold the VSTOR voltage = 2.0 V or 3.0 V
Figure 1. Charger Efficiency vs Input Voltage
bq25570 C003_SLUSBH2.png
VIN_DC = sourcemeter configured with ICOMP = 10 mA and voltage source varied from 0.1 V to 3.0 V
VSTOR = sourcemeter configured to measure current and voltage source set to hold the VSTOR voltage = 2.0 V, 3.0 V or 5.5 V
Figure 3. Charger Efficiency vs Input Voltage
bq25570 C005_SLUSBH2.png
VIN_DC = sourcemeter configured with voltage source = 1.0 V and ICOMP varied from 0.01 mA to 100 mA
VSTOR = sourcemeter configured to measure current and voltage source set to hold the VSTOR voltage = 2.0 V, 3.0 V or 5.5 V
Figure 5. Charger Efficiency vs Input Current
bq25570 C007_SLUSBH2.png
VIN_DC = souremeter configured with voltage source = 0.2 V and ICOMP varied from 0.01 mA to 100 mA
VSTOR = sourcemeter configured to measure current and voltage source set to hold the VSTOR voltage = 2.0 V, 3.0 V or 5.5 V
Figure 7. Charger Efficiency vs Input Current
bq25570 C0019_SLUSBH2.png
VIN_DC = floating and EN = GND and VOUT_EN=VSTOR
VSTOR= sourcemeter configured to measure current and voltage source varied from 2.0 V or 5.5 V
Figure 9. VSTOR Quiescent Current vs VSTOR Voltage: Active Mode
bq25570 C008_SLUSBH2.png
VSTOR = sourcemeter configured as a voltage source, measuring current
OUT = sourcemeter configured to sink current with VCOMP>V(OUT)
Figure 11. Buck Efficiency vs Output Current
bq25570 C010_SLUSBH2.png
VSTOR = sourcemeter configured as a voltage source
OUT = sourcemeter configured to sink current with VCOMP>V(OUT) and measuring voltage
Figure 13. Normalized Buck Output Voltage vs Input Voltage
bq25570 C013_SLUSBH2.png
VSTOR = sourcemeter configured as a voltage source
OUT = sourcemeter configured to sink current with VCOMP>V(OUT) and measuring voltage
Thermal stream for temperature variation
Figure 15. Normalized Buck Output Voltage vs Temperature
bq25570 C014_SLUSBH2.png
VSTOR = sourcemeter configured as a voltage source
OUT = sourcemeter configured to sink current with VCOMP>V(OUT) and measuring voltage
Oscilloscope used to measure switching frequency at LBOOST
Figure 17. Buck Major Switching Frequency vs Output Current
bq25570 C015_SLUSBH2.png
VSTOR = sourcemeter configured as a voltage source
OUT = sourcemeter configured to sink current with VCOMP>V(OUT) and measuring voltage
Oscilloscope used to measure voltage ripple at OUT
Figure 19. Buck Output Voltage Ripple vs Output Current
bq25570 C002_SLUSBH2.png
VIN_DC = Keithley Source Meter configured with ICOMP = 100 µA and voltage source varied from 0.1 V to 3.0 V s
VSTOR = Keithley Sourcemeter configured to measure current and voltage source set to hold the VSTOR voltage = 2.0 V, 3.0 V or 5.5 V
Figure 2. Charger Efficiency vs Input Voltage
bq25570 C004_SLUSBH2.png
VIN_DC = sourcemeter configured with voltage source = 2.0 V and ICOMP varied from 0.01 mA to 100 mA
VSTOR = sourcemeter configured to measure current and voltage source set to hold the VSTOR voltage = 2.2 V , 3.0 V or 5.5 V
Figure 4. Charger Efficiency vs Input Current
bq25570 C006_slusbh2.png
VIN_DC = sourcemeter configured with voltage source = 0.5 V and ICOMP varied from 0.01 mA to 100 mA
VSTOR = sourcemeter configured to measure current and voltage source set to hold the VSTOR voltage = 1.8 V, 3.0 V or 5.5 V
Figure 6. Charger Efficiency vs Input Current
bq25570 C0018_SLUSBH2.png
VIN_DC = floating and EN = VOUT_EN = GND
VSTOR = sourcemeter configured to measure current and voltage source varied from 2.0 V or 5.5 V
Figure 8. VSTOR Quiescent Current vs VSTOR Voltage: Standby Mode
bq25570 C020_SLUSBH2.png
VIN_DC = floating and EN = VSTOR
VSTOR = sourcemeter configured to measure current and voltage source varied from 2.0 V or 5.5 V
Figure 10. VBAT Quiescent Current vs VBAT Voltage: Ship Mode
bq25570 C009_SLUSBH2.png
VSTOR = sourcemeter configured as a voltage source, measuring current
OUT = sourcemeter configured sink current with VCOMP>V(OUT)
Figure 12. Buck Efficiency vs Input Voltage
bq25570 C011_SLUSBH2.png
VSTOR = sourcemeter configured as a voltage source
OUT = sourcemeter configured to sink current with VCOMP>V(OUT) and measuring voltage
Figure 14. Normalized Buck Output Voltage vs Output Current
bq25570 C012_SLUSBH2.png
VSTOR = sourcemeter configured as a voltage source
OUT = sourcemeter configured to increasingly sink current with VCOMP>V(OUT) until V(OUT) < VOUT - 100 mV
Thermal stream for temperature variation
Figure 16. Buck Maximum Output Current vs Input Voltage
bq25570 C016_SLUSBH2.png
VSTOR = sourcemeter configured as a voltage source
OUT = sourcemeter configured to sink current with VCOMP>V(OUT) and measuring voltage
Oscilloscope used to measure switching frequency at LBOOST
Figure 18. Buck Major Switching Frequency vs Input Voltage
bq25570 C017_SLUSBH2.png
VSTOR = sourcemeter configured as a voltage source
OUT = sourcemeter configured to sink current with VCOMP>V(OUT) and measuring voltage
Oscilloscope used to measure voltage ripple at OUT
Figure 20. Buck Output Voltage Ripple vs Input Voltage