BQ25570_14 Datasheet, PDF (6/41 Pages) Texas Instruments – Ultra Low Power Harvester Power Management IC with Boost Charger, and Nano-Powered Buck Converter

bq25570
SLUSBH2C – MARCH 2013 – REVISED JANUARY 2014
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ELECTRICAL CHARACTERISTICS (continued)
Over recommended temperature range, typical values are at T_A = 25°C. Unless otherwise noted, specifications apply for
conditions of VSTOR = 4.2 V, VOUT = 1.8 V. External components, CIN = 4.7 µF, L1 = 22 µH, CSTOR = 4.7 µF, L2 = 10 µH,
COUT = 22 µF
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
BATTERY MANAGEMENT
VBAT_OV
Programmable voltage range for
overvoltage threshold
VBAT increasing
2.2
5.5 V
VBAT_OV_HYST
Battery over-voltage hysteresis (internal) VBAT decreasing;
VBAT_OV = 5.25V
24
55 mV
VDELTA
VBAT_OV - VIN(DC)
Main boost charger on;
400
MPPT not sampling VOC
mV
VBAT_UV
Under-voltage threshold
VBAT decreasing
1.91
1.95
2.0 V
VBAT_UV_HYST Battery under-voltage hysteresis (internal) VBAT increasing
15
32 mV
VBAT_OK_HYST
Programmable voltage range of digital VBAT increasing
signal indicating VSTOR (=VBAT) is OK
VBAT_UV
VBAT_OV V
Programmable voltage range of digital
VBAT_OK_PROG signal indicating VSTOR (=VBAT) is OK VBAT decreasing
VBAT_UV
VBAT_OK
_HYST – mV
50
VBAT_ACCURACY
Overall Accuracy for threshold values
VBAT_OV, VBAT_OK
Selected resistors are 0.1%
tolerance
-2
2%
VBAT_OK(H)
VBAT_OK (High) threshold voltage
Load = 10 µA
VSTOR –
200
mV
VBAT_OK(L)
VBAT_OK (Low) threshold voltage
Load = 10 µA
100 mV
ENABLE THRESHOLDS
EN(H)
Voltage for EN high setting. Relative to
VBAT.
VBAT = 4.2V
VBAT –
0.2
V
EN(L)
Voltage for EN low setting
VBAT = 4.2V
0.3 V
VOUT_EN(H)
Voltage for VOUT_EN High setting.
VSTOR = 4.2V
VSTOR –
0.4
V
VOUT_EN(L)
Voltage for VOUT_EN Low setting.
VSTOR = 4.2V
0.3 V
BIAS and MPPT CONTROL STAGE
VOC_SAMPLE
Time period between two MPPT samples
16
s
VOC_STLG
Settling time for MPPT sample
measurement of VIN_DC open circuit
voltage
Device not switching
256
ms
VIN_REG
Regulation of VIN_DC during charging
0.5 V < VIN < 4 V; IIN(DC)
= 10 mA
10%
MPPT_80
Voltage on VOC_SAMP to set MPPT
threshold to 0.80 of open circuit voltage of
VIN_DC
VSTOR –
0.015
V
MPPT_50
Voltage on VOC_SAMP to set MPPT
threshold to 0.50 of open circuit voltage of
VIN_DC
15 mV
VBIAS
Internal reference for the programmable
voltage thresholds
VSTOR ≥ VSTOR_CHGEN
1.205
1.21
1.217 V
6
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