BQ25505 Datasheet, PDF (8/34 Pages) Texas Instruments – Ultra Low Power Boost Charger with Battery Management and Autonomous Power

bq25505
SLUSBJ3B – AUGUST 2013 – REVISED JANUARY 2014
TYPICAL APPLICATION CIRCUITS
VBAT_OV = 3.11 V, VBAT_OK = 2.39 V, VBAT_OK_HYST = 2.80 V, MPPT (V_OC) = 80%
L1 = 22 µH, CIN = CSTOR = 4.7 µF, CBYP=0.1 µF, CREF = 10 nF
R_OK1 = 5.62 MΩ, R_OK2 = 5.49 MΩ, R_OK3 = 1.87 MΩ, R_OV1 = 7.5 MΩ, R_OV2 = 5.36 MΩ
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CSTOR
Solar ⁺
Cell
-
L1
CIN
CREF
VOC_SAMP
LBOOST
VREF_SAMP
VSS
MPPT
VIN_DC
VSTOR VBAT_SEC
Host
GPIO1
GPIO2
EN
VBAT_OK
CBYP
VSTOR
VBAT_SEC
+ SEC_BAT
(rechargeable)
VBAT_PRI
Boost
Controller ^VBAT_OK
Ideal Diode OR
+
PRI_BAT
VB_PRI_ON
Cold Start
Nano-Power
Management
VB_SEC_ON
bq25505
TPS62736
System
Load
R_OV2
R_OV1
R_OK3
R_OK2
R_OK1
Figure 2. Typical Solar Application Circuit with Primary and Secondary Batteries
8
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