BQ25505 Datasheet, PDF (11/34 Pages) Texas Instruments – Ultra Low Power Boost Charger with Battery Management and Autonomous Power

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HIGH-LEVEL FUNCTIONAL BLOCK DIAGRAM
LBST
VSTOR
VBAT_SEC
bq25505
SLUSBJ3B – AUGUST 2013 – REVISED JANUARY 2014
VSS
VIN_DC
Cold-start
Unit
Enable
Interrupt
PFM Boost
Charger
Controller
VOR
CKT
Enable
VOC_SAMP
VREF_SAMP
MPPT
Controller
BAT_SAVE
VREF
OT
Temp
Sensing
Element
Bias Reference &
Oscillator
VREF
Battery Threshold
Control
OK
VBAT_UV
VREF
EN
VBAT_OV VRDIV
Figure 5. High-Level Functional Diagram
VBAT_PRI
VSS
VB_PRI_ON
VB_SEC_ON
VBAT_OK
OK_PROG
OK_HYST
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