BQ25504 Datasheet, PDF (4/24 Pages) Texas Instruments – Ultra Low Power Boost Converter with Battery Management for Energy Harvester Applications

bq25504
SLUSAH0 – OCTOBER 2011
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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 VIN_DC = 1.2V, VBAT = VSTOR = 3V. External components L_BST = 22 µH, C_HVR = 4.7 µF C_STOR= 4.7 µF.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
BATTERY MANAGEMENT
I_(VBAT)
I_(VSTOR)
Leakage on VBAT pin
VSTOR Quiescent current Charger Shutdown in UV
Condition
VBAT = 2.1 V; VBAT_UV = 2.3 V, T_J = 25°C
VSTOR = 0 V
VBAT = 2.1 V; VBAT_UV = 2.3 V,
–40°C < T_J < 65°C, VSTOR = 0 V
VIN_DC = 0V;
VBAT < VBAT_UV = 2.4V;
VSTOR = 2.2V, No load on VBAT
VSTOR Quiescent current Charger Shutdown in OV
Condition
VIN_DC = 0V,
VBAT > VBAT_OV, VSTOR = 4.25,
No load on VBAT
1
5 nA
80 nA
330
750 nA
570
1400 nA
V_{BAT_OV}
Programmable voltage range for overvoltage
threshold (Battery voltage is rising)
VBAT increasing
2.5
5.25
V
V_{BAT_OV_HYST}
Battery voltage overvoltage hysteresis threshold
(Battery voltage is falling), internal threshold
VBAT decreasing
18
35
89 mV
V_{BAT_UV}
Programmable voltage range for under voltage
threshold (Battery voltage is falling)
VBAT decreasing; VBAT_UV > V_Bias
2.2
VBAT_OV
V
V_{BAT_UV_HYST}
Battery under voltage threshold hysteresis, internal
thershold
VBAT increasing
40
80
125 mV
V_{BAT_OK}
Programmable voltage range for threshold voltage
for high to low transition of digital signal indicating
battery is OK,
VBAT decreasing
VBAT_UV
VBAT_OV
V
V_{BAT_OK_HYST}
Programmable voltage range for threshold voltage
for low to high transition of digital signal indicating
battery is OK,
VBAT increasing
50
VBAT_OV-
VBAT_UV
mV
V_{BAT_ACCURACY}
Overall Accuracy for threshold values, UV, OV,
VBAT_OK
Selected resistors are 0.1% tolerance
–5%
5%
V_{BAT_OKH}
VBAT OK (High) threshold voltage
Load = 10 µA
VSTOR-
200mV
V
V_{BAT_OKL}
TSD_PROTL
TSD_PROTH
VBAT OK (Low) threshold voltage
Load = 10 µA
The temperature at which the boost converter is
OT_Prog = LO
disabled and the switch between VBAT and VSTOR
is disconnected to protect the battery
OT_Prog = HI
100 mV
65
°C
120
OT_Prog
Voltage for OT_PROG High setting
Voltage for OT_PROG Low setting
2
V
0.3
V
BIAS and MPPT CONTROL STAGE
VOC_sample
Sampling period of VIN_DC open circuit voltage
16
s
VOC_Settling
Sampling period of VIN_DC open circuit voltage
256
ms
VIN_Reg
VIN_shutoff
Regulation of VIN_DC during charging
DC input voltage into VIN_DC when charger is
turned off
0.5 V <V_IN < 3 V; I_IN (DC) = 10 mA
–10%
40
80
10%
130 mV
MPPT_Disable
Threshold on VOC_SAMP to disable MPPT
functionality
VSTOR-15
mV
V
VBIAS
Voltage node which is used as reference for the
programmable voltage thresholds
VIN_DC ≥ 0.5V; VSTOR ≥ 1.8 V
1.21
1.25
1.27
V
4
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