MAX8568A Просмотр технического описания (PDF) - Maxim Integrated
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MAX8568A Datasheet PDF : 17 Pages
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Complete Backup-Management ICs
for Lithium and NiMH Batteries
Typical Operating Characteristics (continued)
(Circuit of Figure 7, VIN = 3.6V, VBK = 1.4V, VNI/LI = VBKSU = 3.3V, TA = +25°C, unless otherwise noted.)
CHARGE CURRENT vs. TEMPERATURE
11.0
10.8
VBK = 3.6V, VIN = 4.2V, R5 = 127kΩ
10.6
10.4
10.2
10.0
9.8
9.6 VBK = 3.6V, VIN = 4V, R5 = 127kΩ
9.4
VBK = 1.4V, VIN = 4V, R5 = 169kΩ
9.2
9.0
-40 -15
10
35
60
85
TEMPERATURE (°C)
3.3V STEP-UP EFFICIENCY
vs. LOAD CURRENT
100
90
80
70
60
VBK = 2.9V
50
VBK = 1.4V
40
30
20
10
L1 = MURATA LQH32CN100K
0
0.01
0.1
1
10
100
LOAD CURRENT (mA)
BK SUPPLY CURRENT
vs. INPUT VOLTAGE
70
60
BOOST AND LDO ACTIVE
50
40
30
20
10
VBKSU = 3.3V
0
1
2
3
4
5
INPUT VOLTAGE (V)
CHARGE PROFILE FOR NiMH
1.42
6 MAX8568 toc05
VARTA V20HR
1.40
5
BK VOLTAGE
1.38
4
VBK(NILO) = 1.2V
1.36
VBK(NIHI) = 1.4V
3
VBK(NIMAX) = 1.8V
R5 = 953kΩ
1.34
2
1.32
1.30
0
CHARGE CURRENT
1
0
2
4
6
8
10
CHARGE TIME (HOURS)
2.5V STEP-UP EFFICIENCY
vs. LOAD CURRENT
100
90
80
70
60
VBK = 2.9V
50
VBK = 1.4V
40
30
20
10
L1 = MURATA LQH32CN100K
0
0.01
0.1
1
10
100
LOAD CURRENT (mA)
CHARGE PROFILE FOR LiVeO5
3.6
8 MAX8568 toc06
VBK(LIMAX) = 3.4V
3.4 R5 = 432kΩ
7
3.2
6
3.0
BK VOLTAGE
5
2.8
4
2.6
CHARGE CURRENT
3
2.4
2
2.2
1
PANASONIC VL2330
2.0
0
0
2
4
6
8
10
CHARGE TIME (HOURS)
3.34
3.32
3.30
3.28
3.26
3.24
3.22
3.20
0
BKSU OUTPUT VOLTAGE
vs. LOAD CURRENT
TA = -40°C
TA = +25°C
TA = +85°C
10 20 30 40 50 60
LOAD CURRENT (mA)
LIGHT-LOAD SWITCHING WAVEFORMS
MAX8568 toc11
HEAVY-LOAD SWITCHING WAVEFORMS
MAX8568 toc12
VBKSU
20mV/div VBKSU
AC-COUPLED
20mV/div
AC-COUPLED
VLX
2V/div
VLX
0
2V/div
0
ILX
C3 = 22µF
LOAD = 1mA
50µs/div
200mA/div
0
ILX
C3 = 22µF
LOAD = 50mA
200mA/div
0
5µs/div
6 _______________________________________________________________________________________
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