BQ25570_14 Datasheet, PDF (5/41 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
ELECTRICAL CHARACTERISTICS
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
BOOST CHARGER
VIN(DC)
DC input voltage into VIN_DC
Cold-start completed
100
5100 mV
I-CHG(CBC_LIM) Cycle-by-cycle current limit of charger
0.5V < V_IN < 4.0 V; VSTOR
= 4.2 V
230
285 mA
PIN
Input power range for normal charging
VBAT_OV > VSTOR >
VSTOR_CHGEN
0.005
510 mW
VIN(CS)
VSTOR_CHGEN
Minimum input voltage for cold start
circuit to start charging VSTOR
Voltage on VSTOR when cold start
operation ends and normal charger
operation commences
VBAT < VBAT_UV; VSTOR
= 0 V; 0°C < T_A < 85°C
330
1.6
1.73
400 mV
1.9 V
PIN(CS)
Minimum cold-start input power for
VSTOR to reach VSTOR_(CHGEN) and
allow normal charging to commence
VSTOR < VSTOR_(CHGEN)
5
µW
t_{BAT_HOT_PLUG}
Time for which switch between VSTOR
and VBAT closes when battery is hot
plugged into VBAT
Battery resistance = 300
Ω, Battery voltage = 3.3V
50
ms
QUIESCENT CURRENTS
EN = 0, VOUT_EN = 1 - Full operating
mode
VIN_DC = 0V; VSTOR =
2.1V; T_J = 25°C
VIN_DC = 0V; VSTOR =
2.1V; –40°C < T_J < 85°C
VIN_DC = 0V; VSTOR =
EN = 0, VOUT_EN = 0 - Partial standby ^{2.1V; T}J ^{= 25°C}
I_Q
mode
VIN_DC = 0V; VSTOR =
2.1V; –40°C < T_J < 85°C
VBAT = 2.1 V; T_J = 25°C;
VSTOR = VIN_DC = 0 V
EN = 1, VOUT_EN = x - Ship mode
VBAT = 2.1 V; –40°C < T_J
< 85°C; VSTOR = VIN_DC
=0V
488
700
900
445
615
nA
815
1
5
30
MOSFET RESISTANCES
R_DS(ON)-BAT
ON resistance of switch between VBAT
and VSTOR
VBAT = 4.2 V
0.95
1.50 Ω
R_{DS(ON)_CHG}
Charger low side switch ON resistance
Charger high side switch ON resistance
Charger low side switch ON resistance
Charger high side switch ON resistance
VBAT = 4.2 V
VBAT = 2.1 V
0.70
0.90
2.30
3.00
Ω
0.80
1.00
3.70
4.80
R_{DS(ON)_BUCK}
Buck low side switch ON resistance
Buck high side switch ON resistance
Buck low side switch ON resistance
Buck high side switch ON resistance
VBAT = 4.2 V
VBAT = 2.1 V
0.80
1.00
1.60
2.00
Ω
1.00
1.20
2.40
2.90
f_{SW_CHG}
f_{SW_BUCK}
T_{TEMP_SD}
Maximum charger switching frequency
Maximum buck switching frequency
Junction temperature when charging is
discontinued
VBAT_OV > VSTOR >
1.8V
1
MHz
500
kHz
125
C
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