BQ25505 Datasheet, PDF (9/34 Pages) Texas Instruments – Ultra Low Power Boost Charger with Battery Management and Autonomous Power

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bq25505
SLUSBJ3B – AUGUST 2013 – REVISED JANUARY 2014
VBAT_OV = 4.18V, VBAT_OK = 3.5 V, VBAT_OK_HYST = 3.7 V, MPPT (V_OC) = 50%
L1 = 22 µH, CIN = CSTOR = 4.7 µF, CBYP=0.1 µF, CREF = 10 nF
R_OK1 = 4.22 MΩ, R_OK2 = 8.06 MΩ, R_OK3 = 0.698 MΩ, R_OV1 = 6.04 MΩ, R_OV2 = 7.87 MΩ
CSTOR
CBYP
+ _{SEC_BAT}
VOC_SAMP
L1
LBOOST
TEG
CIN
CREF
VREF_SAMP
VSS
MPPT
VIN_DC
VSTOR VBAT_SEC
Host
GPIO1
GPIO2
EN
VBAT_OK
VSTOR
VBAT_SEC
VBAT_PRI
Boost
Controller ^VBAT_OK
Ideal Diode OR
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 3. Typical TEG Application Circuit without a Primary Battery
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