bq25505
SLUSBJ3B –AUGUST 2013–REVISED JANUARY 2014
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VBAT_OV = 3.31 V, VBAT_OK = 2.82 V, VBAT_OK_HYST = 3.12 V, MPPT (VOC) = 40%
L1 = 22 µH, CIN = CSTOR = 4.7 µF, CBYP=0.1 µF, CREF = 10 nF
ROK1 = 4.99 MΩ, ROK2 = 6.65 MΩ, ROK3 = 1.24 MΩ, ROV1 = 6.98 MΩ, ROV2 = 5.76 MΩ
ROC1 = 8.06 MΩ, ROC2 = 12 MΩ
CSTOR
CBYP
+
SEC_BAT
(rechargeable)
ROC2
VOC_SAMP
LBOOST
ROC1
VSTOR
VBAT
L1
VBAT_PRI
TPS62736
MA4X79600LCT-ND
Ideal Diode OR
+
VREF_SAMP
Vibration
Element
PRI_BAT
Boost
Controller
VBAT_OK
CIN
CREF
System
Load
VB_PRI_ON
MA4X79600LCT-ND
VSS
MPPT
VB_SEC_ON
VIN_DC
Cold Start
Nano-Power
Management
VSTOR
VBAT_SEC
Host
GPIO1
GPIO2
EN
VBAT_OK
bq25505
ROV2
ROV1
ROK3
ROK2
ROK1
Figure 4. Typical Piezoelectric Application Circuit with Primary and Secondary Batteries
10
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