BQ25570_14 Datasheet, PDF (11/41 Pages) Texas Instruments – Ultra Low Power Harvester Power Management IC with Boost Charger, and Nano-Powered Buck Converter

bq25570
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SLUSBH2C – MARCH 2013 – REVISED JANUARY 2014
VBAT_OV = 4.18V, VBAT_OK = 3.5 V, VBAT_OK_HYST = 3.7 V, VOUT=2.5V, MPPT (V_OC) = 50%
L1 = 22 µH, L2 = 10 µH, CIN = CSTOR = 4.7 µF, CBYP=0.1 µF, CREF = 10 nF, COUT = 22 µF
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,
R_OUT1 = 6.19 MΩ, R_OUT2 = 6.65 MΩ
CSTOR
CBYP
+
BAT
TEG
L1
CIN
CREF
VSTOR
Host
GPIO1
GPIO2
GPIO3
VBAT
VOC_SAMP
LBOOST
VREF_SAMP
VSS
VIN_DC
MPPT
EN
VOUT_EN
VBAT_OK
VSTOR
VBAT
Boost
Controller
Buck
Controller
Cold Start
Nano-Power
Management
LBUCK
VOUT
VSS
L2
COUT
bq25570
System
Load
R_OV2
R_OK3
R_OV1
R_OK2
R_OK1
R_OUT2
R_OUT1
(1) See the Capacitor Selection section for guidance on sizing C_STOR
Figure 3. Typical TEG Application Circuit
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