BQ25570_14 Datasheet, PDF (18/41 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
1.004
1.002
VOUT = 1.8V
1
0.998
0.996
IOUT = 0.001mA
IOUT = 0.1mA
IOUT = 10mA
IOUT = 0.01mA
IOUT = 1mA
IOUT = 90mA
0.994
0.992
2.0
3.0
4.0
5.0
VSTOR Voltage (V)
Figure 19. Normalized Buck Output Voltage vs Input Voltage
1.02
VOUT = 1.8V
1.01
IOUT = 0.01mA
IOUT = 1mA
IOUT = 70mA
1
0.99
0.98
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
Temperature (^oC)
Figure 21. Normalized Buck Output Voltage vs Temperature
120
VOUT = 1.8V
100
80
60
40
VSTOR= 2.1V
20
VSTOR = 3V
VSTOR = 4.2V
VSTOR = 5.5V
0
0 10 20 30 40 50 60 70 80 90 100
Output Current (mA)
Figure 23. Buck Major Switching Frequency vs Output
Current
1.02
VOUT = 1.8V
1.01
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1
0.99
VSTOR = 5.5V
VSTOR = 3.6V
VSTOR = 2.1V
0.98
0.001
0.01
0.1
1
10
100
Output Current (mA)
Figure 20. Normalized Buck Output Voltage vs Output
Current
170
160
VOUT = 1.8V - 100 mV
150
140
130
TT_A^A == 8855^oCC
T_AA = 25^oCC
T_AA = 0^oCC
T_AA = -40^o_CC
120
110
100
90
80
2
3
4
5
VSTOR Voltage (V)
Figure 22. Buck Maximum Output Current vs Input Voltage
120
VOUT = 1.8V
100
80
IOUT = 0.5mA
IOUT = 5mA
60
IOUT = 100mA
IOUT = 50mA
40
20
0
2.1 2.6 3.1 3.6 4.1 4.6 5.1
VSTOR Voltage (V)
Figure 24. Buck Major Switching Frequency vs Input
Voltage
18
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